Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for removing volatile substances in mixed aqueous solution of 3-hydroxypropionaldehyde

A volatile, hydroxypropionaldehyde technology, applied in the chemical industry, can solve the problems of high loss rate of 3-hydroxypropionaldehyde, discoloration and yellowing of the solution, etc., so as to reduce the loss of 3-hydroxypropionaldehyde, improve production efficiency, and avoid side effects. effect of reaction

Active Publication Date: 2020-05-19
SHANGHAI HUAYI ENERGY CHEM
View PDF12 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for removing volatile substances in a mixed aqueous solution of 3-hydroxypropanal to solve the problems of high loss rate of 3-hydroxypropanal and solution discoloration and yellowing in the prior art

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for removing volatile substances in mixed aqueous solution of 3-hydroxypropionaldehyde
  • Method for removing volatile substances in mixed aqueous solution of 3-hydroxypropionaldehyde
  • Method for removing volatile substances in mixed aqueous solution of 3-hydroxypropionaldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Pour 300ml of acetaldehyde 7.51wt%, propionaldehyde 0.50wt%, acrolein 0.39wt%, methyl tert-butyl ether 3.53wt%, 3-hydroxypropanal 12.47wt% mixed aqueous solution into a 500ml three-necked flask and placed in a constant temperature water bath with a controlled temperature of 45°C. Continuously blow N into the bottle at a gas rate of 800ml / min 2 Gas stripping, the stripping temperature is 45°C, and the 3-hydroxypropanal mixed aqueous solution from which volatile substances are removed and the auxiliary gas containing volatile substances are respectively obtained. After 1.5h, collect the 3-hydroxypropionaldehyde mixed aqueous solution from which volatile substances were removed, weigh 287g, and analyze the material composition by gas chromatography: acetaldehyde 1.33wt%, propionaldehyde 0.05wt%, acrolein 0.33wt%, MTBE 0wt%, 3-hydroxypropanal 13.86wt%.

[0049] After passing the auxiliary gas containing volatile substances into an ice-water bath at 0°C, the absorption sol...

Embodiment 2

[0051] Pour 300ml of acetaldehyde 5.50wt%, propionaldehyde 0.45wt, acrolein 0.48wt%, methyl tert-butyl ether 1.85wt%, 3-hydroxypropanal 9.85wt% mixed aqueous solution into a 500ml three-necked flask , and placed in a constant temperature water bath with a controlled temperature of 35°C.

[0052] Continuously blow N into the bottle at a gas rate of 1500ml / min 2 Gas stripping, the stripping temperature is 35°C, and the 3-hydroxypropionaldehyde mixed aqueous solution from which volatile substances are removed and the auxiliary gas containing volatile substances are respectively obtained. After 3 hours, collect the 3-hydroxypropionaldehyde mixed aqueous solution from which volatile substances were removed, weigh 285g, and analyze the material composition by gas chromatography: acetaldehyde 0.52wt%, propionaldehyde 0.02wt%, acrolein 0.47wt%, formaldehyde tert-butyl ether 0wt%, 3-hydroxypropanal 11.38wt%.

[0053] After passing the auxiliary gas containing volatile substances into...

Embodiment 3

[0055] Pour 1200ml of acetaldehyde 2.82wt%, propionaldehyde 0.25wt%, acrolein 0.28wt%, methyl tert-butyl ether 3.46wt%, 3-hydroxypropanal 14.74wt% mixed aqueous solution into a 2L three-necked flask and placed in a constant temperature water bath with a controlled temperature of 50°C.

[0056] Continuously blow N into the bottle at a gas rate of 3L / min 2 Gas stripping, the stripping temperature is 50°C, and the 3-hydroxypropionaldehyde mixed aqueous solution from which volatile substances are removed and the auxiliary gas containing volatile substances are respectively obtained. After 2 hours, collect the 3-hydroxypropionaldehyde mixed aqueous solution from which volatile substances were removed, weigh 1187g, and analyze the composition of the material by gas chromatography: 0.30wt% of acetaldehyde, 0wt% of propionaldehyde, 0.56wt% of acrolein, methyl Tert-butyl ether 0wt%, 3-hydroxypropanal 14.9wt%.

[0057] After passing the auxiliary gas containing volatile substances int...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for removing volatile substances in a mixed aqueous solution of 3-hydroxypropionaldehyde. The method comprises the following steps: 1) preheating the volatile-substance-containing mixed aqueous solution of 3-hydroxypropionaldehyde ; 2) subjecting the mixed aqueous solution obtained in the step 1) to auxiliary gas stripping so as to obtain a volatile-substance-removed mixed aqueous solution of 3-hydroxypropionaldehyde and an auxiliary gas containing volatile substances respectively; and 3) absorbing the auxiliary gas containing the volatile substances with an absorption solvent to respectively obtain the absorption solvent containing the volatile substances and the auxiliary gas without the volatile substances. The method solves the problems of high 3-hydroxypropionaldehyde loss rate, easy discoloration and the like caused by removal of volatile substances by adopting a rectification process, and 1,3-propanediol is prepared by hydrogenation under the action of a catalyst after removal of the volatile substances by adopting the removal method, so certain side reactions can be avoided, and the selectivity of 1,3-propanediol is improved.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, and relates to a method for removing volatile substances in a mixed aqueous solution of 3-hydroxypropanal, specifically, in the process of preparing 1,3-propanediol through ethylene oxide hydroformylation, the intermediate The method for removing the volatile substances in the mixed liquid of 3-hydroxypropionaldehyde. Background technique [0002] The hydroformylation of ethylene oxide to 3-hydroxypropanal is described in J. Fable, Newsythses with Carbon monoxide (1980), pp. 131-132. The reaction is catalyzed by a cobalt-based catalyst or a phosphine-modified cobalt-based catalyst. 3-Hydroxypropionaldehyde can be hydrogenated to obtain 1,3-propanediol (PDO), which is a polyester intermediate for the production of fibers and films. Shell has further developed the process of cobalt-based catalyst hydroformylation to synthesize 3-hydroxypropionaldehyde, such as patents US5256827 and U...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/19C07C45/82C07C45/78C07C45/81
CPCC07C45/82C07C45/783C07C45/81C07C45/78C07C47/19
Inventor 刘文艳王培新吴良泉周志宏
Owner SHANGHAI HUAYI ENERGY CHEM