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US 5,008,462 AGranted
Method for preparing monochloroacetaldehyde trimer
AssigneeKureha Chemical Industry Co., Ltd.
InventorsMakoto Ishizuka, Takashi Wakasugi
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Abstract
A method for preparing a monochloroacetaldehyde trimer in a high yield is here disclosed which comprises the steps of dissolving, in an organic solvent, a solution containing monochloroacetaldehyde as the main component, and then trimerizing monochloroacetaldehyde in the presence of sulfuric acid. The thus prepared monochloroacetaldehyde trimer can be heated at 120.degree. C. under atmospheric pressure to obtain pure monochloroacetaldehyde.
Claims13
A method of preparing a monochloroacetaldehyde trimer comprising:
- (a) dissolving a raw material solution in an organic solvent, wherein said raw material solution contains at least 70% by weight monochloroacetaldehyde;
- (b) cooling the solution to a temperature of 0.degree. C. or less;
- and
- (c) reacting the solution with concentrated sulfuric acid in an amount of 10 to 70% by weight with respect to the weight of the raw material solution.
1 more element
A method of preparing a monochloroacetaldehyde trimer comprising:
- (a) preparing a raw material solution of at least 70% by weight monochloroacetaldehyde by chlorinating a compound selected from acetaldehyde and para-acetaldehyde.
- (b) dissolving said raw material solution in an organic solvent;
- (c) cooling the solution to a temperature of 0.degree. C. or less;
- (d) reacting the solution with concentrated sulfuric acid in an amount of 10 to 70% by weight with respect to the weight of the raw material solution;
- and
- (e) separating the deposited crystals of the monochloroacetaldehyde trimer from the organic solution.
3 more elements
Dependencies are inferred from the claim text.