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US 2010/0063331 A1Published application
Processes for the crystallization of 2,2,4,4-tetramethylcyclobutanediol
AssigneeEastman Chemical Company
InventorRuairi Seosamh O'Meadhra
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Abstract
Disclosed is a novel process for the continuous crystallization of a mixture of cis-2,2,4,4-tetramethylcyclobutanediol and trans-2,2,4,4-tetramethylcyclobutanediol dissolved in a solvent.
Claims50
A process for the continuous crystallization of a mixture comprising cis-2,2,4,4-tetramethylcyclobutanediol and trans-2,2,4,4-tetramethylcyclobutanediol dissolved in a solvent, the process comprising:
- (a) crystallizing cis-2,2,4,4-tetramethylcyclobutanediol in a first crystallization stage operated at a temperature such that the concentration of trans-2,2,4,4-tetramethylcyclobutanediol in solution is below the saturated concentration of trans-2,2,4,4-tetramethylcyclobutanediol at the operating temperature of the first stage;
- (b) transferring a slurry of crystallized cis-2,2,4,4-tetramethylcyclobutanediol and the corresponding mother liquor from the first crystallization stage to a second crystallization stage;
- (c) crystallizing both cis-2,2,4,4-tetramethylcyclobutanediol and trans-2,2,4,4-tetramethylcyclobutanediol in the second crystallization stage;
- and
- (d) separating the crystals of cis-2,2,4,4-tetramethylcyclobutanediol and trans-2,2,4,4-tetramethylcyclobutanediol from the mother liquor present in the second crystallization stage to yield a mixture of crystallized cis-2,2,4,4-tetramethylcyclobutanediol and crystallized trans-2,2,4,4-tetramethylcyclobutanediol.
2 more elements
A process for the continuous crystallization of a mixture comprising cis-2,2,4,4-tetramethylcyclobutanediol and trans-2,2,4,4-tetramethylcyclobutanediol dissolved in a solvent, the process comprising:
- (a) crystallizing cis-2,2,4,4-tetramethylcyclobutanediol in a first crystallization stage operated at a temperature such that the concentration of trans-2,2,4,4-tetramethylcyclobutanediol in solution is below the saturated concentration of trans-2,2,4,4-tetramethylcyclobutanediol;
- (b) separating the crystals of 2,2,4,4-tetramethylcyclobutanediol from the mother liquor present in the first crystallization stage;
- (c) removing the crystallized 2,2,4,4-tetramethylcyclobutanediol to yield solid 2,2,4,4-tetramethylcyclobutanediol;
- (d) transferring mother liquor obtained from the separation of crystals to a second crystallization stage;
- (e) crystallizing both cis-2,2,4,4-tetramethylcyclobutanediol and trans-2,2,4,4-tetramethylcyclobutanediol in the second crystallization stage;
- and
- (f) separating the crystals from the mother liquor present in the second crystallization stage to yield a mixture of solid cis-2,2,4,4-tetramethylcyclobutanediol and solid trans-2,2,4,4-tetramethylcyclobutanediol.
4 more elements
Dependencies are inferred from the claim text.