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A kind of refining production line and method of 1,3-propanediol

A technology of propylene glycol and production line, applied in 1 field, can solve the problems of difficult separation, complex composition and the like

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

[0005] Complex chemical reactions occur during the production of 1,3-propanediol solution prepared by chemical methods, so the pre-refined 1,3-propanediol solution contains not only a large amount of water, but also a large number of other complex organic substances and additives , such as 1,3-propanediol solution prepared by acrolein hydration hydrogenation method, mainly contains ethanol, propanol, heterocyclic compounds and polycondensation compounds, etc., the composition is complex and difficult to separate

Method used

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  • A kind of refining production line and method of 1,3-propanediol
  • A kind of refining production line and method of 1,3-propanediol
  • A kind of refining production line and method of 1,3-propanediol

Examples

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Comparison scheme
Effect test

Embodiment 1

[0092] use figure 1 The 1,3-propanediol refining line shown performs the refining of the crude 1,3-propanediol product solution:

[0093] A) 1,3-propanediol thick product solution enters the stripping and delighting tower, and the stripping tail gas drawn from the top of the stripping and delighting tower is collected after condensation or is returned to the stripping and delighting tower, the 1 after the bottom stripping, The 3-propanediol crude product solution enters the pressurized dehydration tower. Among them, the temperature at the top of the stripping and lightening tower is 99.5°C, the temperature at the bottom of the tower is 113°C, the operating pressure is 0MPa, and the reflux ratio of the tower is 8. The content of light components whose boiling point is lower than that of water in the 1,3-propanediol crude product solution treated by the stripping tower is less than 0.2%.

[0094] B) After being treated by the pressurized dehydration tower, one stream of the to...

Embodiment 2

[0103] use figure 1 The 1,3-propanediol refining line shown performs the refining of the crude 1,3-propanediol product solution:

[0104] A), B), C), D) related process parameters are consistent with Example 1,

[0105] E) after 1,3-propanediol solution is processed by the refining tower, the light alcohol removed at the top is condensed and refluxed in the refining tower or collected and processed, the refining 1,3-propanediol extracted in the middle is collected after condensation, and the bottom is separated to obtain The heavy components are sent to the weight removal tower again for processing. Wherein, the temperature at the top of the purification tower is 80°C, the absolute operating pressure is 4kPa, the reflux ratio of the tower is 2, and the temperature at the bottom of the tower is 170°C. Due to the higher temperature of the tower still, the degradation of 1,3-propanediol is caused, and the purified The purity of 1,3-propanediol was 99.4%, and the yield of 1,3-pr...

Embodiment 3

[0107] use figure 1 The 1,3-propanediol refining line shown performs the refining of the crude 1,3-propanediol product solution:

[0108] A) Relevant process parameters are consistent with Example 1

[0109] B) After being treated by the pressurized dehydration tower, one stream of the top steam is returned to the stripping and delighting tower as the stripping steam, and the other stream enters the refrigerator to drive the refrigerator to prepare chilled water for heat recovery and utilization; the material passing through the refrigerator It is refluxed into the pressure dehydration tower or used for raw material deployment; the concentrated 1,3-propanediol solution at the bottom of the pressure dehydration tower enters the vacuum dehydration tower. Among them, the temperature at the top of the pressurized dehydration tower is 125°C, the operating pressure is 30kPa, the reflux ratio of the tower is 0.3, and the temperature at the bottom of the tower is 143°C. After dehydr...

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Abstract

The invention relates to the field of chemical industry, and discloses a refining production line and method for 1,3-propanediol. According to the different characteristics of complex components contained in a 1,3-propanediol crude product solution prepared by a chemical method, a refining process is designed. The production line and refining process can not only separate high-purity (above 99.5%) 1,3-propanediol from the crude product solution, but also realize the recycling of energy and materials, achieving significant energy-saving and consumption-reducing effects, while reducing The loss of 1,3-propanediol is reduced and the final product yield is improved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a refining production line and method for 1,3-propanediol. Background technique [0002] 1,3-Propanediol (PDO) is an important chemical raw material with important applications in materials, medicine, organic synthesis and other fields. Especially in the field of materials, as a monomer or cross-linking agent for polyester and polyurethane, it is used to produce new polymer materials with specific properties, which can be widely used in the fields of fibers, films and polymer devices. Special fibers prepared from propylene glycol esters have excellent properties and have been widely used. [0003] At present, the production of 1,3-propanediol is divided into chemical method and biological fermentation method. There are two main chemical methods, namely (1) ethylene oxide carbonylation method (US 5304686, US 5689016 and US 5777182, etc.), Ethylene oxide is used as raw material, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/80C07C29/76C07C31/20
CPCC07C29/80C07C29/76C07C31/205Y02P20/50
Inventor 彭华峰贾振宇柳铭轩张保勇冯连芳
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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