Patent GB-483560-A (GB)
Title: The manufacture of tanning materials
Filed: 1936-10-16
Abstract: Tanning-agents are obtained by dispersing in sulphite cellulose lye or lignin sulphonic acid solution a water-insoluble non-tanning product obtained by condensing an unsulphonated monohydric aromatic hydroxy compound in an acid medium with a carbohydrate containing at least five carbon atoms in the molecule.  The dispersion may be after treated with an organic reagent known to be capable of linking aromatic nuclei, e.g. formaldehyde or a reagent which yields formaldehyde.  In the examples: (1) glucose is condensed with phenol, and the product is dispersed in thickened sulphite cellulose lye; (2) the condensation product used in example 1 is dispersed in thickened and fermented sulphite cellulose lye, and the dispersion is heated with formaldehyde solution; (3) levulose is condensed with phenol, and the product is dispersed in sulphite cellulose lye; (4) starch is condensed with phenol, and the product is dispersed in sulphite cellulose lye; (5) sucrose is condensed with phenol, and the product is dispersed in sulphite cellulose lye; (6) galactose and phenol are condensed, and the product is dispersed in sulphite cellulose lye; the dispersion is then heated with formaldehyde solution; (7) bleached cotton and phenol are condensed, and the product is dispersed in fermented sulphite cellulose lye; (8) xylose and phenol are condensed, and the product is dispersed in sulphite cellulose lye; (9) potato flour (or potato flakes) and phenol are condensed, and the product is dispersed in sulphite cellulose lye; the dispersion is then heated with acetaldehyde; (10) rye straw and phenol are condensed, and the product is dispersed in sulphite cellulose lye; the dispersion is then heated with formaldehyde solution; (11) wheat and phenol are condensed, and the product is dispersed in sulphite cellulose lye; the dispersion is heated with formaldehyde solution; (12) soy-bean cake and phenol are condensed, and the product is dispersed in sulphite cellulose lye; the dispersion is treated with formaldehyde solution; cakes of peanut, coconut or palm-kernel may be used in place of soy-bean cake; (13) beechwood or pinewood sawdust and phenol are condensed, and the product is dispersed in sulphite cellulose lye; the dispersion is heated with formaldehyde solution.ALSO:Tanning-agents are obtained by dispersing in sulphite cellulose lye or lignin sulphonic acid solution a water-insoluble non-tanning product obtained by condensing an unsulphonated monohydric aromatic hydroxy compound in an acid medium with a carbohydrate containing at least five carbon atoms in the molecule.  The dispersion may be after-treated with an organic reagent known to be capable of linking aromatic nuclei, e.g. formaldehyde or a reagent which yields formaldehyde.  In the examples: (1) glucose is condensed with phenol in the presence of hydrochloric acid, and the excess of phenol is blow off with steam; the product is then dispersed in thickened sulphite cellulose lye; (2) the condensation product used in example 1 is dispersed in thickened and fermented sulphite cellulose lye, and the dispersion is heated with formaldehyde solution; (3) levulose is condensed with phenol in the presence of hydrochloric acid, and excess of phenol is removed by vacuum distillation; the product is then dispersed in sulphite cellulose lye; (4) starch is condensed with phenol in the presence of sodium bisulphate, and the excess of phenol is blown off; the product is then dispersed in sulphite cellulose lye; (5) sucrose is condensed with phenol in the presence of hydrochloric acid, and excess of phenol is removed by vacuum distillation; the product is then dispersed in sulphite cellulose lye; (6) galactose and phenol are condensed in the presence of hydrochloric acid, and excess of phenol is removed by vacuum distillation; the product is then dispersed in sulphite cellulose lye, and the dispersion is heated with formaldehyde solution; (7) bleached cotton and phenol are condensed in the presence of hydrochloric acid, and excess of phenol is blown off with steam; the product is then dispersed in fermented sulphite cellulose lye; (8) xylose and phenol are condensed in the presence of hydrochloric acid, and excess of phenol is removed by vacuum distillation; the product is then dispersed in sulphite cellulose lye; (9) potato flour or potato flakes and phenol are condensed in the presence of thionyl chloride, and excess of phenol is blown off with steam; the product is dispersed in sulphite cellulose lye, and the dispersion is heated with acetaldehyde; (10) rye straw and phenol are condensed in the presence of hydrochloric acid, and excess of phenol is removed by distillation; the product is dispersed in sulphite cellulose lye, and the dispersion is heated with formaldehyde solution; (11) wheat and phenol are condensed in the presence of sulphuric acid, and the product is dispersed in sulphite cellulose lye; the dispersion is heated with formaldehyde solution; (12) soy-bean cake and phenol are condensed in the presence of phosphorus trichloride, and excess of phenol is blown off with steam; the product is dispersed in sulphite cellulose lye, and the dispersion is treated with formaldehyde solution; cakes of peanut, coconut or palmkernel may be used in place of soy-bean cake; (13) beechwood or pinewood sawdust and phenol are condensed in the presence of hydrochloric acid, and excess of phenol is removed by vacuum distillation; the product is dispersed in sulphite cellulose lye, and the dispersion is heated with formaldehyde solution.