Materials and process for enhancing selective separations
Use of a Maillard reaction product as an adjuvant in a variety of applications including solid-liquid separations, corrosion inhibition, emulsification, dust suppression, slow release fertilization, viscosity modification and others and especially as a depressant or collector in separation processes, including the selective separation of solids and/or ionic species from aqueous media, such as in the process of froth flotation.
1. A flotation process for separating a valued material from an aqueous suspension or dispersion containing the valued material comprising adding to the aqueous suspension or dispersion a Maillard reaction product of (1) an amine reactant and (2) a reducing sugar, wherein a molar ratio of the reducing sugar to the amine reactant is about 1:1 to about 3:1.
2. The flotation process of claim 1 , wherein the reducing sugar is selected from the group consisting of: dextrose, fructose, high fructose corn syrup, dihydroxyacetone, erythrulose, ribulose, xylulose, psicose, sorbose, tagatose, glyceraldehyde, erythrose, threose, ribose, arabinose, xylose, allose, altrose, mannose, gulose, galactose, talose, maltose, cellobiose, lactose, and gentiobiose, and wherein the amine reactant is selected from the group consisting of: ammonia, ammonium hydroxide, hydrazine, guanidine, primary amines, secondary amines, quaternary ammonium compounds, polyamines, amino acids, and proteins.
3. The flotation process of claim 1 , wherein an atomic carbon:nitrogen ratio and degree of unsaturation of the Maillard reaction product increases as a reaction temperature and a reaction time are increased.
4. The flotation process of claim 1 , wherein the Maillard reaction product is produced by reacting (1) the amine reactant, (2) the reducing sugar, and (3) a non-carbohydrate polyhydroxy reactant.
5. The flotation process of claim 4 , wherein the non-carbohydrate polyhydroxy reactant is selected from the group consisting of: trimethylolpropane, glycerol, pentaerythritol, partially hydrolyzed polyvinyl acetate, fully hydrolyzed polyvinyl acetate, and mixtures thereof.
6. The flotation process of claim 1 , wherein the Maillard reaction product is formed by reacting (1) the amine reactant and (2) the reducing sugar under Maillard reaction conditions.
7. The flotation process of claim 1 , wherein the Maillard reaction product is formed by reacting (1) the amine reactant, (2) the reducing sugar, and (3) a polycarboxylic acid, wherein the Maillard reaction product in an aqueous medium has a pH of about 2 to about 6.
8. The flotation process of claim 1 , wherein the Maillard reaction product comprises melanoidins.
9. The flotation process of claim 1 , wherein the valued material is selected from the group consisting of: bitumen, one or more minerals, one or more metal ores, and coal.
10. The process of claim 1 , wherein the Maillard reaction product further comprises a polysaccharide.
11. The process of claim 1 , wherein the reducing sugar is maltose or lactose.
12. The process of claim 1 , wherein the Maillard reaction product is in an aqueous medium has a pH of about 2 to about 4.
13. The process of claim 1 , wherein the Maillard reaction product is in an aqueous medium has a pH of about 7.3.
14. The process of claim 1 , wherein the reducing sugar is high fructose corn syrup.
15. The flotation process of claim 1 , wherein the reducing sugar contains an aldehyde moiety reactive with Cu +2 to produce a carboxylic acid moiety.
16. A flotation process for separating a valued material from an aqueous suspension or dispersion containing the valued material comprising adding to the aqueous suspension or dispersion a Maillard reaction product of (1) an amine reactant and (2) a monosaccharide, wherein a molar ratio of the monosaccharide to the amine reactant is about 1:1 to about 3:1.
17. The flotation process of claim 16 , wherein the monosaccharide is selected from the group consisting of: a triose, a tetrose, a pentose, a hexose, a heptose, and a combination thereof.
18. The flotation process of claim 16 , wherein the monosaccharide is selected from the group consisting of: dextrose, fructose, erythrulose, ribulose, xylulose, psicose, sorbose, tagatose, erythrose, threose, ribose, arabinose, xylose, allose, altrose, mannose, gulose, galactose, and talose, and wherein the amine reactant is selected from the group consisting of: ammonia, ammonium hydroxide, hydrazine, guanidine, primary amines, secondary amines, polyamines, and amino acids.
19. The flotation process of claim 16 , wherein the monosaccharide is dextrose and the amine reactant is ammonia.
20. A flotation process, comprising:
adding a Maillard reaction product to an aqueous suspension or dispersion containing a value material to produce a treated mixture, wherein the Maillard reaction product is formed by reacting an amine reactant and a reducing sugar, and wherein a molar ratio of the reducing sugar to the amine reactant is about 1:1 to about 3:1;
forming a relatively hydrophobic fraction that floats to a surface of the treated mixture and a relatively hydrophilic fraction that sinks to a bottom of the treated mixture; and
recovering a value material containing product from either the hydrophobic fraction, the hydrophilic fraction, or both.
21. The method of claim 20 , wherein the formation of the relatively hydrophobic fraction and the relatively hydrophilic fraction is aided by passing air through the treated mixture, agitating the treated mixture, or a combination thereof.
22. The method of claim 20 , wherein the value material is selected from the group consisting of: bitumen, one or more minerals, one or more metal ores, and coal.
23. The method of claim 20 , wherein the reducing sugar is selected from the group consisting of: dextrose, fructose, high fructose corn syrup, dihydroxyacetone, erythrulose, ribulose, xylulose, psicose, sorbose, tagatose, glyceraldehyde, erythrose, threose, ribose, arabinose, xylose, allose, altrose, mannose, gulose, galactose, talose, maltose, cellobiose, lactose, and gentiobiose, and wherein the amine reactant is selected from the group consisting of: ammonia, ammonium hydroxide, hydrazine, guanidine, primary amines, secondary amines, quaternary ammonium compounds, polyamines, amino acids, and proteins.
24. The method of claim 20 , wherein the Maillard reaction product is formed by reacting the amine reactant, the reducing sugar, and a polycarboxylic acid.
25. The method of claim 20 , wherein the Maillard reaction product is formed by reacting the amine reactant, the reducing sugar, and a polycarboxylic acid under Maillard reaction conditions, and wherein the amine reactant comprises ammonium hydroxide, the reducing sugar comprises dextrose, and the polycarboxylic acid comprises citric acid.
26. The method of claim 20 , wherein the Maillard reaction product comprises melanoidins.
27. A flotation process for separating a valued material from an aqueous suspension or dispersion containing the valued material comprising adding to the aqueous suspension or dispersion a Maillard reaction product of (1) an amine reactant and (2) a reducing sugar, wherein a molar ratio of the reducing sugar to the amine reactant is about 1:1 to about 3:1, and wherein the Maillard reaction product is present in an amount of about 0.0005 to 0.05 part by weight of the total solids of the aqueous suspension or dispersion.