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
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
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
Soap is ordinarily thought of as the common cleansing agent well known to everyone. In a general and strictly chemical sense this term is applied to the salts of the non-volatile fatty acids. These salts are not only those formed by the alkali metals, sodium and potassium, but also those formed by the heavy metals and alkaline earths. Thus we have the insoluble soaps of lime and magnesia formed when we attempt to wash in "hard water"; again aluminum soaps are used extensively in polishing materials and to thicken lubricating oils; ammonia or "benzine" soaps are employed among the dry cleaners. Commonly, however, when we speak of soap we limit it to the sodium or potassium salt of a higher fatty acid.