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Process for the preparation of 3-hydroxypropanal

A technology of hydroxypropanal and acrolein, which is applied in the field of preparing 3-hydroxypropanal, can solve the problems of increased pressure difference of ion exchange bed, decreased conversion rate of unsaturated aldehyde, etc., and achieves the goal of decreasing conversion rate and prolonging catalyst life Effect

Inactive Publication Date: 2002-07-17
EI DU PONT DE NEMOURS & CO
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  • Summary
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AI Technical Summary

Problems solved by technology

The acrolein polymer increases the pressure difference of the ion exchange bed, so the conversion of unsaturated aldehydes decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 10.5 liters of catalyst were added to the reaction tube. The acrolein concentration in the aqueous solution was 17.5% (-500 ppm hydroquinone) and 100 ppm propionic acid was added. The solution was pumped through a catalyst bed (Lewatit TP 208, Form H) at a rate of 6.5 liters / hour. The average temperature of the reactor is 69°C, and the pH before the reactor is 4.1. After an experiment duration of about 10 hours, the reactor pressure difference reached 0.4 bar. The conversion was 54.4%, and the selectivity to 3-hydroxypropanal was 81.9%. After a further interval of 316 hours, a differential pressure of 0.4 bar was determined, a conversion of 53.9% and a selectivity to 3-hydroxypropanal of 81.4%. in H 2 In the O distillate, the content of propionic acid added is 80%. The purity of the 1,3-propanediol distillate was 99.8% by gas chromatographic area.

[0049] When comparative example 1 is compared with embodiment 1, it is obvious that adding propionic acid prevents t...

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Abstract

3-Hydroxypropanal is prepared by reacting acrolein with water under pressure and in the presence of an ion exchange resin while adding a carboxylic acid to the reaction mixture.

Description

field of invention [0001] The invention relates to a method for preparing 3-hydroxypropanal. technical background [0002] 3-Hydroxypropionaldehyde is an intermediate product in the preparation of 1,3-propanediol. 1,3-Propanediol can be further processed into polyesters, such as polytrimethylene terephthalate, which are used for fiber spinning, or can be processed into other commercial articles such as polyols. [0003] It is known that 3-hydroxypropanal can be prepared by hydrating acrolein with water at 30-120° C. under a pressure of 1-20 bar in the presence of a chelate-forming ion exchanger, such as U.S. Described in Patent No. 5,171,898, incorporated herein by reference. [0004] U.S. Patent No. 5,284,979 discloses the homogeneous hydration of 2-alkenals to 3-hydroxyalkanals in the presence of an acid catalyst and a dissolved acid-base buffer brought to a pH of 2-5. A preferred acid-base buffer is propionic acid / triethylammonium propionate. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07B61/00C07C45/64C07C47/19
CPCC07C45/64C07C47/19
Inventor T·哈尔斯T·哈姆R·范赫尔图姆W·霍芬L·多伊泽
Owner EI DU PONT DE NEMOURS & CO
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