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Soap-Making Manual

TABLE OF CONTENTS.

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CHAPTER I. Page.

Raw Materials Used in Soap Making 1-30

1. Soap Defined 1

2. Oils and Fats 1-2

3. Saponification Defined 2-3

4. Fats and Oils Used in Soap Manufacture 3-4 Fullers' Earth Process for Bleaching Tallow 4-6 Method for Further Improvement of Color in Tallow 6 Vegetable Oils 6-9 Chrome Bleaching of Palm Oil 9-12 Air Bleaching of Palm Oil 12-16

5. Rancidity of Oils and Fats 16-18 Prevention of Rancidity 18

6. Chemical Constants of Oils and Fats 18-19

7. Oil Hardening or Hydrogenating 19-21

8. Grease 21-22

9. Rosin (Colophony, Yellow Rosin, Resina) 22-23

10. Rosin Saponification 23-24

11. Naphthenic Acids 24-25

12. Alkalis 25-26 Caustic Soda 26 Caustic Potash 26-28 Sodium Carbonate (Soda Ash) 28-29 Potassium Carbonate 29

13. Additional Material Used in Soap Making 29-30

CHAPTER II.

Construction and Equipment of a Soap Plant 31-34

CHAPTER III.

Classification of Soap Making Methods 35-46

1. Full Boiled Soaps 36-42

2. Cold Process 43-44

3. Carbonate Saponification 45-46

CHAPTER IV.

Classification of Soaps 47-104

1. Laundry Soap 48 Semi-Boiled Laundry Soap 49-50 Settled Rosin Soap 50-54

2. Chip Soap 54-55 Cold Made Chip Soap 55-56 Unfilled Chip Soap 56

3. Soap Powders 56-59 Light Powders 60-61

4. Scouring Powders 61

5. Scouring Soap 61-62

6. Floating Soap 62-65

7. Toilet Soap 65-68 Cheaper Toilet Soaps 68-69 Run and Glued-up Soaps 69-71 Curd Soap 71-72 Cold Made Toilet Soaps 72-73 Perfuming and Coloring Toilet Soaps 73-75 Coloring Soap 75-76

8. Medicinal Soaps 76-77 Sulphur Soaps 77 Tar Soap 77 Soaps Containing Phenols 77-78 Peroxide Soap 78 Mercury Soaps 78 Less Important Medicinal Soaps 78-79

9. Castile Soap 79-81

10. Eschweger Soap 81-82

11. Transparent Soap 82-84 Cold Made Transparent Soap 84-87

12. Shaving Soaps 87-90 Shaving Powder 90 Shaving Cream 90-93

13. Pumice or Sand Soaps 93-94

14. Liquid Soaps 94-95

15. Use of Hardened Oils in Toilet Soaps 96-98

16. Textile Soaps 98 Scouring and Fulling Soaps for Wool 98-100 Wool Thrower's Soap 100-101 Worsted Finishing Soaps 101 Soaps Used in the Silk Industry 101-103 Soaps Used for Cotton Goods 103-104

17. Sulphonated Oils 104-105

CHAPTER V.

Glycerine Recovery 105-126

1. Methods of Saponification 105-106 Recovery of Glycerine from Spent Lye 106-113 Twitchell Process 113-118 Autoclave Saponification 118 Lime Saponification 118-120 Acid Saponification 120-121 Aqueous Saponification 121 Splitting Fats with Ferments 121-123 Krebitz Process 123-125

2. Distillation of Fatty Acids 125-126

CHAPTER VI.

Analytical Methods 127-164

1. Analysis of Oils and Fats 128 Free Fatty Acids 128-130 Moisture 130 Titer 130-132 Determination of Unsaponifiable Matter 132-133 Test for Color of Soap 133-134 Testing of Alkalis Used in Soap Making 134-137

2. Soap Analysis 137-138 Moisture 138-139 Free Alkali or Acid 139-142 Insoluble Matter 143 Starch and Gelatine 143-144 Total Fatty and Resin Acids 144 Determination of Rosin 144-147 Total Alkali 147-148 Unsaponifiable Matter 148 Silica and Silicates 148-149 Glycerine in Soap 149-150 Sugar in Soap 150

3. Glycerine Analysis 150-151 Sampling 151 Analysis 151-154 Acetin Process for the Determination of Glycerol 155-156 The Method 156-159 Ways of Calculating Actual Glycerol Contents 159-160 Bichromate Process for Glycerol Determination Reagents Required 160-161 The Method 161-162 Sampling Crude Glycerine 162-164

CHAPTER VII

Standard Methods for the Sampling and Analysis of Commercial Fats and Oils 165-195

1. Scope, Applicability and Limitations of the Methods 165-166 Scope 165 Applicability 166 Limitations 166 Sampling 166-169 Tank Cars 166-167 Barrels, Tierces, Casks, Drums, and Other Packages 168

2. Analysis 169-183 Sample 169 Moisture and Volatile Matter 170-172 Insoluble Impurities 172-173 Soluble Mineral Matter 173 Free Fatty Acids 174 Titer 174-175 Unsaponifiable Matter 176-177 Iodine Number-Wijs Method 177-181 Saponification Number (Koettstorfer Number) 181 Melting Point 181-182 Cloud Test 182-184

3. Notes of the Above Methods 184-196 Sampling 183 Moisture and Volatile Matter 184-187 Insoluble Impurities 187 Soluble Mineral Matter 187-188 Free Fatty Acid 188-189 Titer 189 Unsaponified Matter 190-193 Melting Point 193-196

Plant and Machinery 198-219 Illustrations of Machinery and Layouts of the Plant of a Modern Soap Making Establishment 198-219

Appendix 219-237

Useful Tables

Index 239

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