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A kind of preparation device and method of 1,3-propanediol crude product solution

A preparation device and a technology for propylene glycol, applied in 1 field, can solve the problems of difficult refining process, affecting product yield separation, many side reactions, etc., and achieve high reaction efficiency, reduce the formation of liquid phase dead zone, and high production stability. Effect

Active Publication Date: 2022-07-08
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main problem in the preparation of 1,3-propanediol by hydration and hydrogenation of acrolein is that there are many side reactions in the hydration and hydrogenation stages. The complex reaction generates a variety of by-products, and the raw materials and intermediate products are easy to react with each other to form acetals Impurities, the occurrence of these side reactions affect the yield of the product and the separation in the later stage
The prepared 1,3-propanediol crude product solution is simply classified based on the boiling point of water, containing light components, water, 1,3-propanediol crude solution, and heavy components. These complex components need to be removed separately, so the whole The later refining process is more difficult

Method used

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  • A kind of preparation device and method of 1,3-propanediol crude product solution
  • A kind of preparation device and method of 1,3-propanediol crude product solution
  • A kind of preparation device and method of 1,3-propanediol crude product solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] like figure 1 As shown, a preparation device for 1,3-propanediol crude product solution includes a hydration reactor 1000, an acrolein separation unit, a two-stage hydrogenation unit and a gas-liquid separation unit which are connected in sequence.

[0133] The acrolein separation unit includes an acrolein separation column 2001, a first condenser 2002 and a first reflux tank 2003; the hydration reactor is communicated with the acrolein separation column, and the top of the acrolein separation column, the first condenser, The first return tanks are connected in sequence to form a circuit. The first reflux tank is also connected with a reflux pipe 2004 for preparing the raw materials of the reaction liquid; a steam heat exchanger 2005 is provided at the bottom of the acrolein separation tower.

[0134] The two-stage hydrogenation unit includes a first mixer 3001, a first-stage hydrogenation reactor 3002, a preheater 3004, a second mixer 3005, and a second-stage hydroge...

Embodiment 2

[0162] use figure 1 As shown in the process flow, the concentration of the acrolein raw material solution is 15%, the operating conditions are adjusted, and the specific parameters are shown in Table 2 (for other processes, refer to Example 1).

[0163] Table 2 - Operating conditions for each stage of the process flow

[0164]

[0165]

[0166] In this production process, the temperature and pressure of the hydration reaction are reduced, and the conversion rate of acrolein is reduced; at the same time, the temperature and pressure of the first-stage hydrogenation and the second-stage hydrogenation reaction are reduced, resulting in the conversion of 3-hydroxypropionaldehyde in the first-stage hydrogenation reaction The rate decreased, and after the secondary hydrogenation reaction was completed, a small amount of 3-hydroxypropanal was not completely converted. The reaction was completed, the conversion of acrolein was 99.8%, and the selectivity of the total reaction w...

Embodiment 3

[0168] use figure 1 As shown in the process flow, the concentration of the acrolein raw material solution is 15%, the operating conditions are adjusted, and the specific parameters are shown in Table 3 (for other processes, refer to Example 1).

[0169] Table 3 - Operating conditions for each stage of the process flow

[0170]

[0171] In this production process, the conversion rate of 3-hydroxypropionaldehyde in the first-stage hydrogenation reaction is reduced due to the reduction of the first-stage hydrogenation temperature and pressure. When the reaction temperature is increased, the selectivity of acrolein is reduced, the reaction is completely completed, the conversion rate of acrolein is 99.8%, and the selectivity of the total reaction is 86%.

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Abstract

The invention relates to the field of chemical industry, and discloses a preparation device and method for a 1,3-propylene glycol crude product solution. The method of the invention cooperates with a specially designed preparation device, and undergoes hydration reaction, acrolein separation, primary hydrogenation and secondary addition. Hydrogen series reaction can prepare 1,3-propanediol crude product solution with high conversion rate (99%) and selectivity (88%). Liquid separation can realize the efficient recycling of hydrogen and the removal of light components in the crude product solution.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a preparation device and method for a 1,3-propanediol crude product solution. Background technique [0002] 1,3-Propanediol (PDO) is an important chemical raw material, which can be widely used in the fields of fibers, films and polymer devices. Among them, special fibers prepared from polytrimethylene terephthalate have excellent properties. A wide range of applications have been achieved. At present, the 1,3-propanediol technology in the international market is mainly monopolized by the American Shell Company and the American DuPont Company. [0003] There are mainly two kinds of chemical methods to prepare 1,3-propanediol, namely (1) ethylene oxide carbonylation method (US 5304686, US 5689016 and US 5777182, etc.), using ethylene oxide as raw material, through hydroformyl (2) Acrolein hydration and hydrogenation method (US 5364987 and US 5334778, etc.), using acrolein as raw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/141C07C31/20C07C45/64C07C45/82C07C47/19
CPCC07C29/141C07C45/64C07C45/82C07C31/205C07C47/19Y02P20/10
Inventor 彭华峰贾振宇柳铭轩张保勇尹婉钰冯连芳
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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