Patent GB-1112398-A (GB)
Title: Method of producing readily dispersible solid particles,and products thereof
IPC: B01J2/30
Filed: 1965-09-13
Abstract: Solvent soluble solid particles which normally tend to cake in storage and clump in a solvent dispersing medium are converted to free-flowing dry particles instantly dispersible in a solvent by homogeneously wetting the surfaces of the solid particles with a wetting liquid comprising a mixture of a volatile liquid solvent for the particles and a volatile liquid non-solvent for the particles, miscible with the solvent, the total solvent component of the liquid mixture with which the solids are wet being less than sufficient entirely to dissolve the solid particles, and then drying the wetted solids to remove all of the wetting liquid.  The solid may be incorporated in the two liquids already mixed, or in the one liquid and the other added.  A solvent already containing dissolved material (the same as the treated material or different) may be used.  The drying may be effected with agitation, with or without heat. Materials: guar, arabic, agar, karaya, tragacanth, psyllium and locust bean gums; sodium carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, ethyl hydroxyethyl cellulose, hydroxypropylmethyl cellulose and nitrocellulose; dextrins, starches and hydroxyethyl starches; flours; sugars; resins, including polyvinyl alcohol; dyestuffs; esters, organic acids and alcohols; urea; ammonium nitrate and other nitrates; borax; phosphates; fertilizers; cement; clay products; pigments; oxides, nitrites, chlorides and other halides; catalyst materials; and food mixes such as prepared puddings, pancake flour, cake mixes, beverages containing cocoa, milk products, egg products, fruit and other powdered flavourings, and "instant" breakfast foods.  Examples are directed to adding the following materials to mixtures of acetone and water in specified proportions (the acetone predominating) and to air drying of the wetted materials after removal of the body of liquid: (1) sodium carboxymethyl cellulose, (2) powdered guar gum, (3) powdered freshly ground cement, (4) polyvinyl alcohol, (5) methyl cellulose, (6) flour, (8) urea, (9) ammonium nitrate and (10) borax.  According to a further example (7) nitrocellulose is rendered readily dispersible in acetone by treatment with an acetone/water mixture predominant in water.  According to a further example (11) a particulate product readily dispersible in hot or cold water or milk is obtained by intimately mixing 1000 g. ethyl alcohol and 150 c.c. water with 500 g. cocoa powder, 500 g. sucrose and 500 g. dextrose. After the liquid portion has been removed, the remainder is dried by hot air.ALSO:Resin particles which normally tend to cake in storage and clump in a solvent dispersing medium are converted to free-flowing dry particles instantly dispersible in a solvent by homogeneously wetting the surfaces of the solid particles with a wetting liquid comprising a mixture of a volatile liquid solvent for the particles and a volatile liquid non-solvent for the particles, miscible with the solvent, the total solvent component of the liquid mixture with which the solids are wet being less than sufficient entirely to dissolve the solid particles, and then drying the wetted solids to remove all of the wetting liquid.  The solid may be incorporated in the two liquids already mixed, or in the one liquid and the other added.  A solvent already containing dissolved material (the same as the treated material or different) may be used.  The drying may be effected with agitation, with or without heat.ALSO:Solvent soluble solid particles which normally tend to cake in storage and clump in a solvent dispersing medium are converted to free-flowing dry particles instantly dispersible in a solvent by homogeneously wetting the surfaces of the solid particles with a wetting liquid comprising a mixture of a volatile liquid solvent for the particles and a volatile liquid non-solvent for the particles, miscible with the solvent, the total solvent component of the liquid mixture with which the solids are wet being less than sufficient entirely to dissolve the solid particles, and then drying the wetted solids to remove all of the wetting liquid.  The solid may be incorporated in the two liquids already mixed, or in the one liquid and the other added.  A solvent already containing dissolved material (the same as the treated material or different) may be used.  The drying may be effected with agitation, with or without heat. Materials.-guar, arabic, agar, karaya, tragacanth, psyllium and locust bean gums; sodium carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, ethyl hydroxyethyl cellulose, hydroxypropylmethyl cellulose and nitrocellulose; dextrins, starches and hydroxyethyl starches; flours; sugars; resins, including polyvinyl alcohol; dyestuffs; esters, organic acids and alcohols; urea; ammonium nitrate and other nitrates; borax; phosphates; fertilizers; cement; clay products; pigments; oxides, nitrites, chlorides and other halides; catalyst materials. Examples are directed to adding the following materials to mixtures of acetone and water in specified proportions (the acetone predominating) and to air drying of the wetted materials after removal of the body of liquid: (1) sodium carboxymethyl cellulose, (2) powdered guar gum, (3) powdered freshly ground cement, (4) polyvinyl alcohol, (5) methyl cellulose, (6) flour, (8) urea, (9) ammonium nitrate and (10) borax.ALSO:Solvent soluble solid particles which normally tend to cake in storage and clump in a solvent dispersing medium are converted to free-flowing dry particles instantly dispersible in a solvent by homogeneously wetting the surfaces of the solid particles with a wetting liquid comprising a mixture of a volatile liquid solvent for the particles and a volatile liquid non-solvent for the particles, miscible with the solvent, the total solvent component of the liquid mixture with which the solids are wet being less than sufficient entirely to dissolve the solid particles, and then drying the wetted solids to remove all of the wetting liquid.  The solid may be incorporated in the two liquids already mixed, or in the one liquid and the other added.  A solvent already containing dissolved material (the same as the treated material or different) may be used. The drying may be effected with agitation, with or without heat. Materials:- guar, arabic, agar, karaya, tragacanth, psyllium and locust bean gums; sodium carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, ethyl hydroxyethyl cellulose, hydroxypropylmethyl cellulose and nitrocellulose; dextrins, starches and hydroxyethyl starches; flours; sugars; resins, including polyvinyl alcohol; dyestuffs; esters, organic acids and alcohols; urea; ammonium nitrate and other nitrates; borax; phosphates; fertilizers; cement; clay products; pigments; oxides, nitrites, chlorides and other halides; catalyst materials; and food mixes such as prepared puddings, pancake flour, cake mixes, beverages containing cocoa, milk products, egg products, fruit and other powdered flavourings, and "instant" breakfast foods. Examples are directed to adding the following materials to mixtures of acetone and water in specified proportions (the acetone predominating) and to air drying of the wetted materials after removal of the body of liquid: (1) sodium carboxymethyl cellulose, (2) powdered guar gum, (3) powdered freshly ground cement, (4) polyvinyl alcohol, (5) methyl cellulose, (6) flour, (8) urea, (9) ammonium nitrate and (10) borax.  According to a further example (7) nitrocellulose is rendered readily dispersible in acetone by treatment with an acetone/water mixture predominant in water.  According to a further example (11) a particulate product readily dispersible in hot or cold water or milk is obtained by intimately mixing 1000 g ethyl alcohol and 150 c.c. water with 500 g cocoa powder, 500 g sucrose and 500 g dextrose. After the liquid portion has been removed, the remainder is dried by hot air.ALSO:Solvent soluble solid particles which normally tend to cake in storage and clump in a solvent dispersing medium are converted to free-flowing dry particles instantly dispersible in a solvent by homogeneously wetting the surfaces of the solid particles with a wetting liquid comprising a mixture of a volatile liquid solvent for the particles and a volatile liquid non-solvent for the particles, miscible with the solvent, the total solvent component of the liquid mixture with which the solids are wet being less than sufficient entirely to dissolve the solid particles, and then drying the wetted solids to remove all the wetting liquid.  The solid may be incorporated in the two liquids already mixed, or in the one liquid and the other added.  A solvent already containing dissolved material (the same as the treated material or different) may be used.  The drying may be effected with agitation, with or without heat. Materials: guar, arabic, agar, karaya, tragacanth, psyllium and locust bean gums, sodium carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, ethyl hydroxyethyl cellulose, hydroxypropylmethyl cellulose and nitrocellulose; dextrins, starches and hydroxyethyl starches; flours; sugars; resins, including polyvinyl alcohol; dyestuffs; esters, organic acids and alcohols; urea; ammonium nitrate and other nitrates; borax; phosphates; fertilizers; cement; clay products; pigments; oxides, nitrites, chlorides and other halides; catalyst materials; and food mixes such as prepared puddings, pancake flour, cake mixes, beverages containing cocoa, milk products, egg products, fruit and other powdered flavourings, and "instant" breakfast foods.  Examples are directed to adding the following materials to mixtures of acetone and water in specified proportions (the acetone predominating) and to air drying of the wetted materials after removal of the body of liquid: (1) sodium carboxymethyl cellulose, (2) powdered