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Method and device for preparing 3-hydroxypropionaldehyde through continuous catalytic rectification

A technology of catalytic rectification and hydroxypropionaldehyde, applied in the field of petrochemical industry, can solve the problems of low selectivity and low conversion rate, and achieve the effects of simple device process, improved selectivity and high economic benefits

Active Publication Date: 2021-08-20
JIANGSU YANGNONG CHEM GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In summary, it can be seen that the existing process for preparing 3-hydroxypropanal by hydration of acrolein has disadvantages such as low conversion rate and low selectivity.

Method used

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  • Method and device for preparing 3-hydroxypropionaldehyde through continuous catalytic rectification
  • Method and device for preparing 3-hydroxypropionaldehyde through continuous catalytic rectification
  • Method and device for preparing 3-hydroxypropionaldehyde through continuous catalytic rectification

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Embodiment 1

[0075] This embodiment provides a device for preparing 3-hydroxypropanal by continuous catalytic rectification, such as figure 1 As shown, the system device includes a hydration reaction device 1 and a catalytic rectification device connected in sequence, the first catalyst 31 is arranged in the hydration reaction device 1, and the second catalyst 32 is arranged in the catalytic rectification device; The hydration reaction device 1 includes a hydration reaction column; a first heat exchange device 4 is arranged before the hydration reaction device 1; the first heat exchange device 4 is a preheater; the material outlet of the hydration reaction device 1 is connected The middle part of catalytic rectification unit; Said catalytic rectification unit comprises the first catalytic rectification tower 21 and the second catalytic rectification tower 22; The material outlet of said first heat exchange device 4 connects the first catalytic rectification tower 21 Middle part; The middle...

Embodiment 2

[0080] This embodiment provides a method for preparing 3-hydroxypropanal by continuous catalytic rectification. The method is carried out using the device in Example 1, and specifically includes the following steps:

[0081] (1) Mix acrolein and water to obtain a mixed solution with a mass concentration of acrolein of 14%. The mixed solution is preheated to 50° C. by a preheater at a flow rate of 5 kg / h and then at a space velocity of 0.5 h -1Send into the hydration reactor, the hydration reactor is filled with the first catalyst, the first catalyst includes the resin (model: S957) whose surface functional group is phosphoric acid, the resin (model: CT151) of sulfonic acid and iminoacetic acid type Resin (model: S930Plus), ratio 1:1:1 (wt%), hydration reaction under the action of the first catalyst to obtain a hydration reaction product;

[0082] (2) The hydration reaction product described in step (1) is sent to the middle part of the first stage catalytic rectification, the ...

Embodiment 3

[0084] This embodiment provides a method for preparing 3-hydroxypropanal by continuous catalytic rectification. The method is carried out using the device in Example 1, and specifically includes the following steps:

[0085] (1) Mix acrolein and water to obtain a mixed solution with a mass concentration of acrolein of 18%. The mixed solution is preheated to 30°C by a preheater at a flow rate of 2kg / h and then at a space velocity of 2h -1 Send into the hydration reactor, and the hydration reactor is filled with the first catalyst, and the first catalyst includes the resin of iminoacetic acid type (model is S930Plus) and aminophosphonic acid type (model is S940), and its mass ratio is 1:1, performing a hydration reaction under the action of the first catalyst to obtain a hydration reaction product;

[0086] (2) The hydration reaction product described in step (1) is sent to the middle part of the first section catalytic rectification, the bottom temperature of the first section ...

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Abstract

The invention provides a method and device for preparing 3-hydroxypropionaldehyde through continuous catalytic rectification. The method comprises the steps of (1) mixing acrolein and water, and carrying out a hydration reaction on the obtained mixed solution under the action of a first catalyst to obtain a hydration reaction product; and (2) carrying out continuous catalytic rectification on the hydration reaction product obtained in the step (1), upwards conveying acrolein, continuously carrying out hydration reaction under the action of a second catalyst, and downwards conveying 3-hydroxypropionaldehyde generated by the hydration reaction in the steps (1) and (2) to realize separation of 3-hydroxypropionaldehyde and acrolein, thereby obtaining the 3-hydroxypropionaldehyde product. According to the method, reaction and rectification are coupled together, the conversion rate of acrolein can be increased to be greater than or equal to 96%, the selectivity of 3-hydroxypropionaldehyde is increased to be greater than or equal to 90%, and meanwhile, the content of 3, 3 '-oxybis-1-propionaldehyde by-products in the hydration process is effectively reduced through the method.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a method and a device for preparing 3-hydroxypropionaldehyde through continuous catalytic rectification. Background technique [0002] 3-Hydroxypropionaldehyde (3-HPA) is an intermediate in the synthesis of 1,3-propanediol by acrolein hydration, and its synthesis yield determines the yield of 1,3-propanediol. 1,3-Propanediol (1,3-Propanediol, 1,3-PDO) is mainly used in the production of polytrimethylene terephthalate (PTT) fibers, PTT is a polyester product with excellent performance, which combines the softness of nylon and better color fastness, the bulk of acrylic, the stain resistance of polyester, and high resilience. [0003] At present, the industrial production methods of 1,3-propanediol mainly include ethylene oxide carbonylation method, bioengineering method, and acrolein hydration method. The process conditions of the ethylene oxide carbonylation metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/64C07C45/82C07C47/19B01D3/14B01D3/32B01J8/00
CPCC07C45/64C07C45/82B01J8/00B01D3/143B01D3/32C07C47/19Y02P20/10
Inventor 徐林丁克鸿王怡明刘相李许健赵慧张巍伟周世虎张赛王涛张文超
Owner JIANGSU YANGNONG CHEM GROUP
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