Method for recovering an organic compound from solutions
AssigneeXyrofin Oy
InventorsJuha Nurmi, Olli-Pekka Eroma, Kristian Eriksson
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Abstract
The invention relates to a method for recovering a crystallizable organic compound from solutions containing said compound. In accordance with the method, the compound is crystallized substantially by way of nucleation from a solution having high viscosity and high supersaturation in respect of the compound to be recovered, and the formed crystals are recovered.
Claims44
A method for recovering a crystallize organic compound from a solution containing said compound, comprising crystallizing the said compound by way of nucleation from a solution having a viscosity of at least about 100,000 CP and a supersaturation of less than about 4 in respect of the compound to be recovered under conditions including continuous intermixing into and from high shear zones and a slow cooling rate of from about 10-100 hours effective to promote said nucleation without substantial crystal growth and recovering a crystalline mass.
A method for the recovery of crystallizable organic compounds from aqueous solutions thereof comprising:
- (1) concentrating said aqueous solution to a dry substance content of at least 75 weight percent to provide a supersaturated solution of said crystallizable organic compound constituting a crystallization mass;
- (2) subjecting said crystallization mass to conditions to maintain said crystallization mass in the nucleation zone therefor;
- (3) and recovering crystalline product from said crystallization mass.
A method for recovering a crystallizable organic compound selected from the group consisting of a sugar, a sugar alcohol, a sugar alcohol anhydride, a carbohydrate, a hydroxy acid, a salt of a hydroxy acid, an amino acid, a salt of an amino acid and betaine from solutions containing said crystallizable organic compound, comprising crystallizing said crystallizable organic compound by way of nucleation from a solution having a viscosity sufficient to retard crystal growth of said organic compound and a supersaturation value at which nucleation is dominant and crystal growth is inhibited, said nucleation being carried out under conditions including continuous intermixing into and from high shear zones and a slow cooling rate of from about 10-100 hours effective to promote said nucleation without substantial crystal growth, and recovering a crystalline mass.
Dependencies are inferred from the claim text.