Patent GB-392342-A (GB)
Title: Improvements in or relating to preventing the formation of lumps during the swelling or solution of organic powders
IPC: A23J3/00
Filed: 1932-04-07
Abstract: The formation of lumps during swelling or solution of finely-divided organic substances is prevented by retarding the rate of swelling or solution by aggregating the substance into a powder of porous particles having a larger grain size than the original material, if necessary after slightly moistening with a small proportion, for example 2-3 per cent, of liquid.  The raw materials include saponins, proteins, tannins, galls, glucosides and ox gall.  The aggregation may be effected by (1) treating the powders, moistened or not, between heated surfaces such as rollers and comminuting the resulting flakes, (2) slightly moistening the powder with liquids or emulsions in which the substances swell, for example by spraying in a tower, excess liquid being removed, if necessary, by drying.  There may be added to the treating liquids substances which reduce the rate of solution of the substance, such as aluminates, borates, citrates and tannins, wetting agents such as alkali salts of alkylated naphthalene sulphonic acids, Turkey red oils, alkali salts of the sulphuric esters of fatty alcohols, alkali salts of the amino-ethane sulphonic acids substituted at the nitrogen by fatty acid residues, and adhesive substances such as solutions of glue, and gelatine, paste, gum arabic or dextrin, (3) adding to those powders which swell or dissolve in water, finely divided hygroscopic substances and exposing the mixture to a moist atmosphere, (4) introducing the powder into hot organic liquids in which it is slightly soluble or insoluble, such as xylol, skimming off the porous masses, drying in a current of hot air and comminuting, (5) introducing finely divided liquids into the heated powder, for example in an atomizing-apparatus.ALSO:The formation of lumps during swelling or solution of soap made by an atomization drying process, soap powders, soap substitutes, resins, gum resins, and waxes is prevented by retarding the rate of swelling or solution by aggregating the substance into a powder of porous particles having a larger grain size than the original material, if necessary after slightly moistening with a small proportion, for example 2-3 per cent of liquid.  The aggregation may be effected by (1) treating the powders, moistened or not, between heated surfaces such as rollers and comminuting the resulting flakes, (2) slightly moistening the powder with liquids or emulsions in which the substances swell, for example by spraying in a tower, excess liquid being removed, if necessary, by drying.  There may be added to the treating liquids substances which reduce the rate of solution of the substance, such as aluminates, borates, citrates, and tannins, wetting agents such as alkali salts of alkylated naphthelene sulphonic acids, Turkey red oils, alkali salts of the sulphuric esters of fatty alcohols, alkali salts of the amino-ethane sulphonic acids substituted at the nitrogen by fatty acid residues, and adhesive substances such as solutions of glue and gelatine, paste, gum arabic, or dextrin, (3) adding to those powders which swell or dissolve in water, finely divided hygroscopic substances and exposing the mixture to a moist atmosphere.  (4) introducing the powder into the organic liquids such as xylol in which it is slightly soluble or insoluble, skimming off the porous masses, drying in a current of hot air, and comminuting, (5) introducing finely divided liquids into the heated powder, for example in an atomizing apparatus.ALSO:The formation of lumps during swelling or solution of finely-divided organic substances is prevented by retarding the rate of swelling or solution by aggregating the substance into a powder of porous particles having a larger grain size than the original material, if necessary after slightly moistening with a small proportion, for example 2-3 per cent of liquid.  The raw materials include rubber, guttapercha, balata, soap made by an atomization drying process, soap powders, soap substitutes, saponins, carrageen, agar-agar, tragacanth, quince mucilage, Iceland moss, carob bean flour, viscin, proteins, tannins, galls, glue, gelatine, pectin, gums, resins, gum resins, waxes, carbohydrates such as starch, starch preparations and dextrin, glucosides and ox gall.  The aggregation may be effected by (1) treating the powders, moistened or not, between heated surfaces such as rollers and comminuting the resulting flakes, (2) slightly moistening the powder with liquids or emulsions in which the substances swell, for example by spraying in a tower, excess liquid being removed, if necessary, by drying.  There may be added to the treating liquids substances which reduce the rate of solution of the substance, such as aluminates, borates, citrates and tannins, wetting agents such as alkali salts of alkylated naphthalene sulphonic acids, Turkey red oils, alkali salts of the sulphuric esters of fatty alcohols, alkali salts of the aminoethane sulphonic acids substituted at the nitrogen by fatty acid residues, and adhesive substances such as solutions of glue, and gelatine, paste, gum arabic or dextrin, (3) adding to those powders which swell or dissolve in water, finely divided hygroscopic substances and exposing the mixture to a moist atmosphere, (4) introducing the powder into hot organic liquids in which it is slightly soluble or insoluble such as xylol, skimming off the porous masses, drying in a current of hot air and comminuting, (5) introducing finely divided liquids into the heated powder, for example in an atomizing apparatus. Specification 374,399 is referred to.