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US 9,255,301 B2Granted
Process for the crystallisation of a water-soluble compound
AssigneeWageningen Universiteit
InventorsJohan Pieter Marinus Sanders, Marieke Elisabeth Bruins, Jeroen Johannes Cornelis Franciscus Van Bon
Life of this patent
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Abstract
A process for the crystallization of a water-soluble compound from a solution of water and a solvent is provided. A process for the manufacture of crystalline sucrose from sugar palm juice or sucrose-containing biomass comprising such crystallization process is also disclosed.
Claims27
A process for crystallisation of sucrose from a solution, comprising:
- (a) providing, in a crystallisation vessel, a solution of the sucrose in a mixture of water and a solvent, wherein the sucrose has a lower solubility in the solvent than in water;
- (b) passing vapour phase of the mixture through a sorption zone containing a water vapour sorbent to selectively adsorb water from the vapour phase to obtain a vapour phase depleted in water and enriched in the solvent and water-saturated water vapour sorbent;
- (c) enriching the mixture in the crystallisation vessel in solvent by (i) recycling at least part of the vapour phase depleted in water and enriched in the solvent to the crystallisation vessel or (ii) withdrawing vapour phase depleted in water from the process and adding solvent from an external source to the crystallisation vessel;
- (d) allowing solid crystals of the sucrose to precipitate from the solution in the crystallisation vessel at a crystallisation temperature;
- and
- (e) discharging precipitated solid crystals of the sucrose from the crystallisation vessel and discharging a solution of non-crystallised sucrose in water-solvent mixture from the crystallisation vessel.
3 more elements
A process for the manufacture of crystalline sucrose from sucrose-containing biomass, comprising:
- (a1) extracting comminuted sucrose-containing biomass with an aqueous liquid selected from water or a mixture of water and an alcohol with one to four carbon atoms or a mixture of two or more thereof, to obtain a solution of sucrose in the aqueous liquid and solid extracted biomass comprising remaining sucrose;
- (a2) separating the solution of sucrose from the solid extracted biomass;
- and
- (a3) supplying the solution to a crystallisation vessel or, in case the aqueous liquid is water, supplying both the solution and a stream of the alcohol to the crystallisation vessel;
- (b) passing vapour phase of the mixture through a sorption zone containing a water vapour sorbent to selectively adsorb water from the vapour phase to obtain a vapour phase depleted in water and enriched in the solvent and water-saturated water vapour sorbent;
- (c) enriching the mixture in the crystallisation vessel in solvent by (i) recycling at least part of the vapour phase depleted in water and enriched in the solvent to the crystallisation vessel or (ii) withdrawing vapour phase depleted in water from the process and adding solvent from an external source to the crystallisation vessel;
- (d) allowing solid crystals of the sucrose to precipitate from the solution in the crystallisation vessel at a crystallisation temperature;
- and
- (e) discharging precipitated solid crystals of the sucrose from the crystallisation vessel and discharging a solution of non-crystallised sucrose in water-solvent mixture from the crystallisation vessel.
6 more elements
A process for crystallisation of a water-soluble compound from a solution, comprising:
- (a) providing, in a crystallisation vessel, a solution of the water-soluble compound in a mixture of water and a solvent, wherein the water-soluble compound has a lower solubility in the solvent than in water;
- (b) passing vapour phase of the mixture through a sorption zone containing a water vapour sorbent to selectively adsorb water from the vapour phase to obtain a vapour phase depleted in water and enriched in the solvent and water-saturated water vapour sorbent;
- (c) enriching the mixture in the crystallisation vessel in solvent by (i) recycling at least part of the vapour phase depleted in water and enriched in the solvent to the crystallisation vessel or (ii) withdrawing vapour phase depleted in water from the process and adding solvent from an external source to the crystallisation vessel;
- (d) allowing solid crystals of the water-soluble compound to precipitate from the solution in the crystallisation vessel at a crystallisation temperature of 60 to 90° C.;
- and
- (e) discharging precipitated solid crystals of the water-soluble compound from the crystallisation vessel and discharging a solution of non-crystallised water-soluble compound in water-solvent mixture from the crystallisation vessel.
3 more elements
Dependencies are inferred from the claim text.