Introduction: Classification of Synthetic Tannins

PART I SECTION I

The Synthesis of Vegetable Tannins

1. Tannin
2. Digallic Acid
3. Ellagic Acid
4. Depsides
Carbomethoxylation of Hydroxybenzoic Acids
Chlorides of Carbomethoxyhydroxybenzoic Acids
Preparation of Didepsides
Preparation of Tridepsides
Preparation of Tetradepsides
Tannoid Substances of the Tannin Type
Chart showing the Decomposition of Products of Tannin

SECTION II

Synthesis of Tanning Matters

1. Aromatic Sulphonic Acids
2. Condensation of Phenols
Condensation of Hydroxybenzene
Condensation of Dihydroxybenzene
Trihydroxy benzene
Polyhydroxybenzenes
Quinone
Phenolic Ethers
Nitro Bodies
Amino Bodies
Aromatic Alcohols
Aromatic Acids
3. Condensation of Naphthalene Derivatives
4. Condensation of the Anthracene Group
5. Di- and Triphenylmethane Groups
6. Summary

Table

SECTION III

Tanning Effects of Mixtures and Natural Products

1. Mixture of Phenolsulphonic Acid and Formaldehyde 2. Mixture of Phenolsulphonic Acid and Natural Tannins 3. Tanning Effects of Different Natural Substances

SECTION IV

Methods of Examining Tanning Matters

PART II

Synthetic Tannins: Their Industrial Production and Application

A. Condensation of Free Phenolsulphonic Acid
B. Condensation of Partly Neutralised Phenolsulphonic Acid
C. Condensation of Completely Neutralised Phenolsulphonic Acid
D. Condensation of Cresolsulphonic Acid
E. Relative Behaviour of an Alkaline Solution of Bakelite and
Natural Tannins
F. Dicresylmethanedisulphonic Acid (Neradol D)
1. Neradol D Reactions
2. Electro-Chemical Behaviour of Neradol D
3. The Influence of Salts and Acid Contents
on the Tanning Effect of Neradol D
4. Phlobaphene Solubilising Action of Neradols
5. Effect of Neradol D on Pelt
6. Reactions of Neradol D with Iron and Alkalies
7. Reagents suitable for Demonstrating the
Various Stages of Neradol D Tannage
8. Combination Tannages with Neradol D
(1) Chrome Neradol D Liquors
(2) Aluminum Salts and Neradol
(3) Fat Neradol D Tannage
9. Analysis of Leather containing Neradol D
10. Properties of Leather Tanned with Neradol D
11. Neradol D, Free from Sulphuric Acid
12. Neutral Neradol
G. Different Methods of Condensation as Applied to
Phenolsulphonic Acid
1. Condensation Induced by Heat
2. Condensation with Sulphur Chloride
3. Condensation with Phosphorus Compounds
4. Condensation with Aldehydes
5. Condensation with Glycerol

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INDEX