PROPOSAL ON SOAP RESEARCH PROJECT

CHAPTER ONE

1.0: INTRODUCTION

Soap may be defined as a chemical compound or mixture of chemical compounds resulting from the interaction of fatty acids or fatty glycerides with a metal radical (or organic base). Soap may also be described as any water-soluble salt of those fatty acids which contain eight or more carbon atoms. The metals commonly used in soap making are sodium and potassium, which produce water-soluble soaps that are used for laundry and cleaning purposes (Kuntom et al. 1994). The qualities of soap are determined by the amount and composition of the component fatty acids in the starting oil. Blends of oils can be used in both the hot and cold soap production methods. Vegetable oil blends could be obtained by mixing different vegetable oils such as the mixture of coconut oil, palm kernel oil, groundnut oil and shea butter in different proportions. Kuntom et al. (1996), produced soaps of desirable quality by blending various fatty acids of palm oil (PO) and palm kernel oil (PKO) and the quality of the soap produced is comparable to the quality of commercially available soaps.

This research work involves using various blends of Neem Oil, Castor Oil and palm kernel oil (PKO) to prepare soap and analyzing the soaps so produced.

1.1: RESEARCH PROBLEM STATEMENTS

The production of quality soaps at cheaper rate has been a hitch to many soap producers in Nigeria; this has led to the production of soaps with poor qualities and high cost of production. Blending various vegetable oils of different qualities and prices for soap production could go a long way in the production of quality soaps for laundry, bathing and general cleaning purposes, still at minimized cost of production.

 

1.2: AIMS AND OBJECTIVES

The aim of this research work is to study the quality of soap produced from blended vegetable oils. The objectives of this work are:

·         To produce soap that can be used on both hard and soft water.

·         To produce soap of high quality that can be used for both bathing and laundry.

·         To investigate the properties of soap produced from blends of oils.

·         To produce soap of high cleaning action that also lathers well in water.

·         To produce soap at a cheaper rate from blends of cheap vegetable oils.

1.3: JUSTIFICATION

Blends of vegetable oils is essentially good in the production of quality and cheap multipurpose soaps that are firm to touch, with high cleaning action and formation of excellent lather in both hard and soft waters.

1.4: SCOPE OF RESEARCH WORK

The scope of this work covers the procurement of various vegetable oils and other essential soap materials from various Markets in Zaria, using the materials in carrying out the research and testing / analyzing the results obtained. This work will embrace quality and cost effectiveness.

1.5: LIMITATIONS

Unavailability of blender specially designed for soap production to intermix the lye and fat so that trace stage can be reached in minutes instead of hours.

 

 

 

CHAPTER TWO

2.0: LITERATURE SURVEY

Soaps are anionic surfactants used in conjunction with water for washing and cleaning. Soaps are mainly used as surfactants for washing, bathing, and cleaning, but they are also used in textile spinning and are important components of lubricants. Soaps for cleansing are obtained by treating vegetable or animal oils and fats with a strongly alkaline solution. Fats and oils are composed of triglycerides; three molecules of fatty acids are attached to a single molecule of glycerol. It consist of sodium or potassium salts of fatty acids and is obtained by reacting common oils or fats with a strong alkaline solution in a process known as saponification. Soap belongs to the family of detergents which is a substance which improves the cleaning properties of water.  In saponification, the fats are first hydrolyzed into free fatty acids, which then combine with the alkali to form crude soap. Glycerol (glycerine) is liberated and is either left in or washed out and recovered as a useful byproduct, depending on the process employed (Cavitch and Miller, 1994).

2.1: FATS AND OILS

Panduranga et al. reported that soap making oils and fats are contained in animal and vegetable fats and oil (such as beef tallow, grease, coconut oil, palm oil, palm kernel oil linseed oil, rubber seed oil, soybean oil, and corn oil), among others. These fats and oils contain various properties of the fatty acid usually having 6-22 carbon atoms in the paraffin chain. These include caprylic acid (C₈H₁₆O₃), lauric acid (C₁₄H₃₂O₂), stearicacid (C₁₈H₃₆O₂), and linoleic acid (C₁₈H₃₂O₂) among others. Depending on different grades of soap for final consumption, various methods have been employed to produce soaps.

Chevreul showed that the manufacture of soap involved a definite chemical decomposition of the oil or fat into fatty acid and glycerol. He continued that fatty acid combining with soda, potash, or other base, forms the soap, with the glycerol remaining free. The reaction with stearin is as follows:

CH2OOC18H35

CH2OH

|

|

CHOOC18H35

+

3NaOH

3NaOOC18H35

+

CHOH

|

|

CH2OOC18H35

CH2OH

Stearin

sodium hydroxide

sodium stearate

glycerol

2.2: SAPONIFICATION

Saponification is the chemical process of making soap that involves an exothermic reaction between lye (sodium hydroxide) and a fat (usually oils). The saponification value (Table 2.1) of fat is essential in soap production in the determination of the amount of lye needed. Equation 1 shows the relevance of saponification value in soap production.

The formula to calculate the amount lye needed with the known amount of fat/oil is given thus:

………………………….(1)
For multiple/ blends of oils, calculate separately and add lye totals together.

For example, using PKO, Castor Oil and Neem oil,

…………… (2)

…………… (3)

…………. (4)

Therefore, the weight of lye required to make the oil soap from the oil blend is given by

+ …………………………………. ( 5)     

 

Table 2.1: Saponification values of some oils/fats

 

Oils	Sodium Hydroxide (For Bar soap)	Potassium Hydroxide (Liquid & Whipped Soap)
Almond, Sweet	0.136	0.1904
Apricot Kernel	0.135	0.1890
Avocado	0.133	0.1862
Babassu	0.175	0.2450
Brazil Nut	0.175	0.2450
Beeswax	0.069	0.0966
Canola	0.124	0.1736
Castor	0.128	0.1800
Cocoa Butter	0.137	0.1918
Coconut	0.190	0.2660
Cod Liver	0.132	0.1856
Corn	0.136	0.1904
Cottonseed	0.138	0.1940
Flaxseed	0.135	0.1899
Grapeseed	0.126	0.1771
Hazelnut	0.136	0.1898
Hempseed	0.137	0.1883
Jojoba	0.069	0.0966
Lanolin	0.074	0.1037
Lard	0.139	0.1932
Macadamia Nut	0.139	0.1946
Neem	0.136	0.1941
Olive (Pomace)	0.156	0.1876
Palm Butter	0.156	0.2184
Palm Kernel	0.156	0.2184
Palm	0.141	0.1974
Peanut	0.137	0.1904
Pumpkin Seed	0.135	0.1863
Rapeseed	0.124	0.1736
Rice Bran	0.129	0.1792
Safflower	0.136	0.1904
Sesame	0.133	0.1862
Shea Butter	0.128	0.1792
Shortening (Veg)	0.136	0.1904
Soybean	0.134	0.1890

Source: (Washbasin Wonders, (2012); Pallas Athene Soap, (2009))

2.3: RAW MATERIALS USED IN SOAP-MAKING

Some of the raw materials used in soap making are:

2.3.1: Fats and Oils

All animal fats and vegetable oils intended for soap-making should be as free as possible from unsaponifiable matter, of a good colour and appearance, and in a sweet, fresh condition (Simmons and Appleton, 2007).Fats and oils used to make soap must come from animal or vegetable sources. Oil derived from another sources such as mineral oil, cannot be used. Soap can be made by using only one kind of fat or oil, by blending animal and vegetable oil or blending more than one vegetable oil. Animal fats are hard fats. Soap that uses only animal fat is hard, tends to be grainy, and lathers poorly. Conversely, Soap made only from vegetable oils lathers well but does not harden properly. A mixture of the two or more types of fats or oils brings out the best qualities of both. Other oils that can be used are olive, cottonseed, maize, soybean, groundnut, safflower, sesame, linseed, etc. Coconut and palm oils are very good for soap making. The animal or hard fats are generally used to make soap are tallow and lard. Tallow is the fat from beef or lamb. Lard is the fat from hogs. Butterfat is acceptable. However, chicken fat is not a hard fat, and is regarded as oil (Francioni and Callings, 2002).

Some other vegetable oils are very rich in minerals and Vitamins that are good for the skin. Vegetable oils such as Almond Oil, Aloe Vera Butter, Aloe Vera Oil, Apricot Kernel Oil, Avocado Butter, Avocado Oil, Babassu Nut Oil, Beeswax Animal, Borage Oil, Candelilla Wax, Canola Oil, Castor Bean Oil, Cherry Kernel Oil, Cocoa Butter, Coconut Oil, Jojoba Seed Oil, Neem Tree Oil, Olive Oil, Palm Kernel Oil, Peanut Oil, Pumpkin Seed Oil and Soybean Oil, among several others. These oils, when used in bathing soap nourish the skin, and cure many skin infections and diseases.

2.3.1.1: Olive oil

Olive Oil is made from pressing the olive fruit. This oil is an excellent moisturizer because it attracts external moisture, holds the moisture close to the skin, and forms a breathable film to prevent loss of internal moisture. It is also known for healing properties.

2.3.1.2: Palm oil

Palm Oil is known for moisturizing with a creamy rich lather. It is so important to use sustainable palm oil as it safes the environment.

 

2.3.1.3: Coconut oil

Coconut Oil is considered a gift. Its discovery has contributed to higher grade soaps in addition to its rich, moisturizing lather. If used in too high of portions it can be drying. Many of these natural oils have replaced lard in high quality soaps.

2.3.1.4: Jojoba

Jojoba is a perennial woody shrub grown primarily in the desert regions of the southwestern United States and northwestern Mexico. Native Americans have long used jojoba to help heal sores and wounds. Today, jojoba oil is still most commonly used for cosmetic purposes, particularly for the maintenance of healthy skin.
Jojoba oil helps promote healing of the skin in many ways. It has antimicrobial properties, which means it actually discourages the growth of some bacterial and fungal microbes that attack the skin. In addition, the chemical composition of jojoba closely resembles that of the skin’s natural sebum, so it is easily absorbed and rarely causes allergic reactions, even in the most sensitive individuals.

2.3.1.5: Shea butter

Shea Butter is from the nut of the Shea Tree, also known as “The Tree of Life”. The Shea tree (locally known as ori) only grows in the savannah region of Africa. It grows up to 60 feet and can live up to 200 years. The Shea Tree produces its fruits once a year. The nut in the center of the fruit when crushed and traditionally processed by boiling and extracting the oil, is what yields the vegetable fat known as Shea Butter. She butter contains vitamins A, E, and F, and fatty acids, which provide healing abilities superior to cocoa butter. This natural butter has proven cell regenerative, moisturizing, and anti-aging properties, which restore shine and beauty to skin and hair. Effective in preventing stretch marks, wrinkles, inflammation, eczema, and dryness from razor irritation. Easily absorbs into the skin without clogging pores.
 Shea butter has been used for centuries in Africa for cooking, and also as skin treatment for its amazing ability to renew, repair, and protect the skin against harsh climates. African healers and beauties like Cleopatra have known about Shea butter for thousands of years. Shea butter is also called "Women's Gold," because extracting the butter from the nuts gives income to hundreds of thousands of rural African women.

2.3.1.6: Mango butter

Mango butter is extracted from the shelled fruit kernel of the mango tree, which is a tropical evergreen. This butter is highly emollient, softening and soothing to the skin. Mango butter has protective effects against UV radiation and also helps treat skin rash, eczema, insect bites, and poison ivy. Mango butter can help protect and heal skin from the damage caused by sunburn and frostbite. While mango butter is excellent for skin, it is often mixed with other ingredients because it is much harder than Shea butter.
2.3.1.7: Aloe vera butter

Aloe Vera Butter is a combination of coconut oil and aloe vera. It is a soft, white butter with a low melting point. Aloe Vera Butter has similar qualities to Aloe Vera Gel in that it soothes and helps heal dehydrated skin conditions such as eczema, psoriasis, sunburn and windburn. It can be added to moisturizing soaps, creams, lotions, lip balms and body butters, and can be used on its own as a body balm or after-sun treatment.
 2.3.1.8: Cocoa butter

Cocoa butter is obtained from the same bean as chocolate and cocoa. Cocoa butter lays down protective layer that holds moisture to the skin, making it a good skin softener.

 

 

 2.3.1.9: Calendula flower

Calendula flower used creams and washes are used to disinfect minor wounds and to treat infections of the skin. The antibacterial and immune stimulant properties of the plant make it extremely useful in treating slow-healing cuts and cuts in people who have compromised immune systems. The herb stimulates the production of collagen at wound sites and minimizes scarring. Gargling calendula water may ease sore throat. We make Calendula infused oils to add to natural creams/lotions.

2.3.1.10: Castor oil

Castor oil is derived from the bean produced from the castor plant. Like olive oil and jojoba oil, castor oil acts as a humectants by attracting and retaining moisture to the skin.

2.3.1.11: Sweet almond oil

Sweet Almond Oil is known for its many skin benefits. While it is used for all skin types, sweet almond oil is particularly effective for dry skin that is prone to itching and irritation. The oil is a nice choice for the natural oil cleansing method because it is light, moisturizing and doesn't leave a greasy residue on the skin once it absorbs.

2.3.1.12: Sunflower Oil

Sunflower Oil is very high in essential fatty acids. It helps to moisturize, regenerate and condition the skin. Sunflower oil is good oil for mature, sensitive, dry or damaged skin. Non oily feel in lotions, saves, and lip balms. Excellent moisturizer and massage/baby oil. (DMBB, 2013)

 

 

 

2.3.2: Alkali

Alkalis are basic (low pH) substances that cause the desired chemical reaction. Common alkalis used are caustic soda (sodium hydroxide) and potash (potassium hydroxide). The alkalis use in soap making can be from two sources:

·         lye, caustic soda, or potash, purchased at the market: or

·         lye obtained by leaching or washing water through the ashes of plants.

 2.3.3: Other Soap Ingredients

Borax, soda, ammonia, kerosene, naptha, and rosin are sometimes added to increase the quantity of suds and improve the appearance of the soap. They are not necessary. Perfumes are added to make soap smell more pleasant. Either essential oils or artificial perfumes can be used. Some essential oils commonly used are lavender, geranium, winter green, citronella, clover lemon, rose, almond, caraway, and banana. The oil or perfume is stirred into the soap just before the

soap is poured into molds. The quantity of perfume used depends on the size of the batch of soap being produced, the intensity of the perfuming agent, and the strength of the desired final

scent. The amount used can vary from a few drops to 15 grams or more.

Coloring matter can also be added. For example, vegetable or aniline dyes can be used to make soap. They are stirred evenly into the soap mixture before pouring it into molds. The color obtained from aniline dyes has a tendency to fade slightly when soap is exposed to bright light

(Francioni and Callings, 2002).

2.4: EQUIPMENT FOR SOAP PRODUCTION

·         Bowls, buckets, pots, (Aluminum material should never be used as lye destroys aluminum),

·         Measuring cups of glass or enamel,

·         Spoons, paddles, or smooth sticks for stirring. (These should be made from wood or enamel),

·         Containers for molding soap, these can be wooden, cardboard, or waxed cartons.

·          Cotton cloth, waxed paper, or other material for lining molds. Cut the cloth or paper into two strips, one a little wider than the mold and the other a little longer than the mold. This lining will ease the removal of the soap from the molds,

·         Hot plate,

·         Thermometer with the range of 0 to 100°C. If a thermometer is available, the following information may be useful for judging the correct temperature at which to mix the fat and the lye together.

When a combination of equal amounts of different fats and oils is used, the temperature used for mixing is the mean of those used by each alone (Francioni and Callings, 2002).

For a long time, Nigerians have been using imported soap from foreign countries. These traders have difficulties especially in terms of clearance through customs; looting and so on. This has consequently made the price of the products to be more expensive. Moreover, much soap made by indigenous producers has been found out to lack quality that is good for the skin.

2.5: TYPES OF SOAP BASED ON PROCESS, PROPERTIES AND COMPOSITIONS

Hard and soft soaps are included. Often, hardness is achieved through the addition of hardening agents, so many natural soaps tend to be softer. Hard soap can be produced by repeat regrinding and re-forming, known as triple milling.

Keeping the moisture content low helps the hardness of the soap, but this is often achieved by accelerated curing in very low humidity conditions.

2.5.1: Glycerin Soaps

Glycerine is a normally produced during the soap making process. Glycerine is a humectants, which means it attracts water. Therefore soaps with glycerine in them tend to make your skin feel moister. At the same time glycerine soaps tend to have more water in them and attract water from the atmosphere, therefore 'sweating' in humid conditions. Much commercial soap has had the glycerine component removed during manufacture as it can be sold separately.

2.5.2: Transparent Soap

This soap uses slightly different components and usually some form of alcohol to alter the process. The process is also conducted at higher temperatures. All these facts change the process and hence the resulting product. Not all transparent soaps are glycerine soaps.

2.5.3: Liquid Soaps

Are actually quite difficult to make and many of the commercial liquid soaps are just in fact detergents: They are in liquid state.

2.5.4: Tablet or Bar Soaps

These are generally solid soaps.

2.6: TYPES OF SOAP BASED ON USAGE

Either based on the ingredients used by the manufacturer or producer can be used for different purposes, which cover cleaning, washing to bathing. The types of soap based on usage are

 

2.6.1: Antiseptic Soaps and Bathing Soaps

Antiseptic soap, sometimes called antibacterial soap or anti-fungal soap, is regular soap in liquid or solid form that contains some kind of ingredient that reduces the chance of infection when applied to the skin. These products also have antimicrobial properties, meaning they kill or inhibit the growth of microbes like bacteria, virus, or fungi. Alcohol, triclosan, and tetrasodium EDTA are three antiseptics commonly used in soap, and they are all examples of antibacterial antiseptics, meaning they are proven to be effective against bacteria. Other antiseptics have anti-viral properties, and some are anti-fungal and can be used to treat or prevent fungal infections like athlete's foot, ringworm, or vaginal yeast infections. Many antiseptics have a combination of these various properties. Some essential oils, such as tea tree oil, contain naturally occurring antiseptics called terpenes that have antibacterial, anti-fungal, and antiviral properties. These various kinds of antiseptic ingredients are also used in soap (WiseGEEK, 2013).

Some scientists and medical professionals are critical of the increasing use of antiseptic soap and the addition of antibacterial ingredients to so many cleaning products. They believe that this practice might lead to more strains of bacteria becoming resistant to antibacterial agents, eventually causing antibiotic medications to become less effective. This could make it more difficult to treat serious medical conditions caused by bacteria, like staph infections and pneumonia. For example, many microorganisms are already resistant to triclosan, meaning that even though it is a proven antibacterial agent, it may not be as effective as stated by some soap manufacturers because many strains of bacteria are immune to it (WiseGEEK, 2013).

 

2.7: SOAP MAKING PROCESSES

There are several different soap making processes that will allow easy production of soap products.

2.7.1: Cold Process Soap Making

This process requires a scale, a large stainless steel pot, measuring cups, kitchen thermometers, rubber gloves, mold, cardboard, plastic bags, olive oil, coconut oil, shortening, lye, distilled water, and fragrances. The cold process gets its name from the general low temperatures that are used to mill this type of soap.

2.7.2: Hot Process Soap Making

This process is named for its boiling pot method of soap milling. For this type of homemade soap making you will need palm oil, coconut oil, sesame oil, shea butter, castor oil, sodium hydroxide, water, borax, soap molds, stainless steel pot, stirring stick or spoon, plastic wrap.

2.7.3: Handmilled Soap Making Method

This method is also called soap rebatching in which soap can be made from soap scraps that can still be rework into a new bar of soap. To do this, soap scraps, a mold, a grater, fragrance, dyes, and other additives are needed. The best type of soap base for this type of soap making is cold process soap. To start with you will want to grate your soap into fine particles. Then place all of your shavings into a glass bowl that can be placed in a double boiler. As the double boiler heats up you will need to stir your grated soap pieces. Add in your vegetable oils and fragrances at this point, making sure that everything is incorporated. Break up soap clumps that form. Continue to cook until the soap reaches the string stage. At this point the soap will thicken rapidly. Remove the pot from the heat source quickly add in fragrances, coloring, herbs, and optional items in that order. Spoon into molds and allow it to cure.

2.7.4: Melt And Pour Soap Making Method.

Out of all of the soap making methods this is perhaps the easiest for novice soap makers. It involves simply melting a soap base in a double boiler, adding in fragrance and dyes, and then placing the soap mixture into a mold.

2.8: SUPERFAT SOAP

Adding extra oil to cold or hot process soap after it has traced or cooked is called superfatting. Superfattng typically is used to make soap more moisturizing. I usually superfat soap that has a good deal of coconut oil, say 20-30%. However, soap may be superfatted regardless of whether or not there is coconut oil in the formulation. Of all the oils used in soap making coconut oil is one that is a mainstay of many formulations owing to the fact that it creates a super hard soap and produces a soap that lathers well. The downside to using coconut oil is that it has a high percentage of lauric acid, a medium chain triglyceride, which renders it a great cleaner but drying to the skin. Therefore formulations that have coconut oil - in any amounts but especially in amounts over 20% should be superfatted so that it will not be drying. The addition of the extra oil that does not take part in the saponification process but rather at the end of trace or the cook is small, usually anywhere from 1-5% of the total oils used.
One other big reason to superfat natural soap especially cold process soap has to do with the soap's pH and its drying effects on the skin. Regular cold process soap, though a natural product has a high pH (9.5). Skin on the other hand has a low pH (4.5-6) in the acidic range. The difference between the low pH of skin and high pH of natural cold process and this incompatibility is what causes soap to be drying to the skin. In order to make soap more compatible with our skin's pH we should superfat natural cold proces soap by adding fatty acids (oils).

CHAPTER THREE

3.0 EQUIPMENT AND INSTRUMENTATION

3.1: EQUIPMENT FOR SOAP PRODUCTION

Some of the instruments to be used for in the soap production include:

·         Bowls, buckets, pots, (Aluminum material should never be used as lye destroys aluminum),

·         Measuring cups of glass and enamel,

·         Spoons, paddles, or smooth sticks for stirring. (These should be made from wood or enamel),

·         Mould or tray or container, these can be wooden, cardboard, or waxed cartons.

·          Cotton cloth, waxed paper, or other material for lining molds. Cut the cloth or paper into two strips, one a little wider than the mold and the other a little longer than the mold. This lining will ease the removal of the soap from the molds,

·         Hot plate,

·         Thermometer with the range of 0 to 100°C. If a thermometer is available, the following information may be useful for judging the correct temperature at which to mix the fat and the lye together.

 

 

 

 

 

CHAPTER FOUR

4.0: METHODOLOGY

4.1: PREPARATION OF OILS BLEND

The blends of oils comprise of Palm Kernel Oil (PKO), Neem Oil (NO) and Castor Oil (CO). The first oils blend contains 60% PKO, 20%Neem Oil, and 20% Castor Oil. The oils will be melted by heating and will be thoroughly mixed with an electric mixer so as to obtain a perfect blend of the oils. The oils blends will be re-weighed to ascertain an accurate weight (100%) which will be required for complete saponification. The same procedure will be followed to obtain the various blends with different oil proportions. The different vegetable oils blends A, B, C, D and E are as shown in Table 4.1 below.

TABLE 4.1: Preparation of Oil Blends

Oil	Proportion of oil Blends
	A (%)	B (%)	C (%)	D (%)	E (%)	F (%)	G (%)
PKO	60	70	20	20	100	-	-
Neem	20	15	60	20	-	100	-
Castor	20	15	20	60	-	-	100
Total (g)	100	100	100	100	100	100

 

4.2: PREPARATION OF LYE

Using the saponification values of the oils and their weights in gram, the required quantity of caustic soda to be used can be obtained. A standard relation has shown that 140mL of water will be required to dissolve 40g of NaOH. Table 4.2 shows the required quantity by weight of caustic soda and the volume of water required in the preparation of each caustic soda solution for each sample.

Table 4.2: Numerical data showing the weight of Caustic Soda and volume of Water required for preparing the Caustic Soda solution of every soap sample.

Samples	Caustic Soda Required (gram)	Distilled Water Required (mL)	Concentration (g/mL)
A	14.64	51.00	0.29
B	14.88	52.08	0.29
C	13.86	48. 51	0.29
D	10.40	36.00	0.29
E	15.60	54.60	0.29
F	13.60	47.60	0.29
G	12.80	44.80	0.29

For Sample A, 51.00mL of distilled water will be weighed and kept in a flask. 14.64g of NaOH will also be Weighed and dissolved in the measured distilled water. The solution should be stirred well to ensure complete dissolution of NaOH in water.

This procedure will be repeated for sample B, C, D, F and G with the corresponding quantities of NaOH and water (shown in Table 4.2).

4.3: PRODUCION OF SOAP

100g of Oils blend A (in Table 4.1) should be heated on a hot plate in a pot and should be poured into a plastic container at about 80^oC, then the caustic soda solution sample A (in Table 4.2) should be added gradually to the hot oil blend and should be stirred thoroughly until a trace level is observed when the soap has started to be solidifying. At this point, the additives (glycerine and perfume) should be added while stirring, until the thick viscous soap is quickly transferred into the Mould which should be covered with blanket to prevent the soap from absorbing moisture and becoming rancid after solidifying. The blanket should be removed and the soap should be left opened to dry well, after which the soap can be analyzed.

The same procedure as demonstrated above should be repeated for Samples B, C, D, E, F and G. They should be analyzed. The process flow chart for the production of the soaps is as shown in the flow chart (Figure 4.1) below.

Figure 4.1: The process flow chart for the production of the soap.

4.4: SOAP ANALYSIS

Each of the prepared soaps will be analyzed to determine the soap yield, nature of the soaps, solubility of the soaps in tap water, distilled water and hard water, time taken to dissolve 1g of

soap in 100ml of distilled water and the pH of the soap at room temperature (at the first stage of

curing and after 2 months of curing). A comparative analysis was carried out using commercial

soaps by determining their solubility and pH.

 

 

4. 5: COST ANALYSIS OF THE SOAPS

A production cost analysis was done using the amount of each reagent and each oils/fats to determine the approximate cost of each soap compared to the cost of the commercial soaps.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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andColour Trades Journal. London Scott, Greenwood & Son Offices 8 Broadway, Ludgate Hill, E.C.Also available online at http://www.gutenberg.org/files/21724/21724-h/21724-h.htm [Accessed on 2nd January, 2013].

Talabi. O. A., Koleoso, O.A. (1984): Utilization of sheafat (A vegetable oil). Federal Institute of

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