Epoxypropane material flow separation method, epoxidation reaction product separation method and propylene epoxidation method

A technology of propylene oxide and separation method, applied in the direction of organic chemistry and the like, can solve the problems of increasing the construction cost and operating cost of an extractive distillation column, reducing the volumetric efficiency of the extractive distillation column, increasing the amount of waste water generated, etc., and improving the low temperature heat source. Effectiveness of utilization efficiency, lower construction and operating costs, and reduced liquid volume

Pending Publication Date: 2022-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the amount of extractant is high, on the one hand, it is necessary to use a bulky extractive distillation tower, which increases the construction cost and operation cost of the extractive distillation tower, and reduces the volumetric efficiency of the extractive distillation tower; The amount of liquid in the methanol refining system increases the processing

Method used

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  • Epoxypropane material flow separation method, epoxidation reaction product separation method and propylene epoxidation method
  • Epoxypropane material flow separation method, epoxidation reaction product separation method and propylene epoxidation method
  • Epoxypropane material flow separation method, epoxidation reaction product separation method and propylene epoxidation method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0146]Example 1

[0147] (1) Methanol and propylene and hydroxide (50% by weight of hydrogen peroxide) are mixed with propylene: hydrogen peroxide: methanol, mixed, mixture from the bottom to a epoxidation reaction catalyst ( The epoxidation catalyst produced by the SpoC Catalyst Changling Branch, the catalyst is a tube fixing bed reactor of the molded hollow titanium silicon molecular sieve catalyst (tube diameter φ25 mm, length 4m) The epoxidation reaction is carried out in contact with the epoxidation reaction catalyst, wherein the temperature in which the fixed bed reactor is controlled at a temperature of 45 ° C, and the volume vacancy is 0.2h in the hydrosectant meter. -1 The epoxidation reaction product stream is obtained from the top of the epoxidation reactor. In the epoxidated reaction product stream, the content of methanol is 62.2% by weight, and the content of propylene oxide is 13.% by weight, and the content of water is 13.% by weight, and the content of propylene i...

Example Embodiment

[0183] Example 2

[0184] Example 2 differs from Example 1 in that: step (3-1), adjusting the methanol fractionator distillation conditions are: reflux ratio of 1.2.

[0185] The crude propylene oxide, propylene oxide content of 96.4 wt%, methanol content of 3.4 wt%, the content was 0.03 wt% ester, aldehyde content was 0.10 wt%, acetone content of 0.03% by weight.

[0186] Oxide obtained in the final product, the content of ethylene oxide was 99.98% by weight, the content by weight of 19 ppm of methanol, the ester is 7ppm weight content, aldehyde content was 23ppm by weight, the weight of an acetone content of 4ppm. With respect to the propylene oxide epoxidation reaction product stream, and recovery of propylene oxide is 99.8%.

Example Embodiment

[0191] Example 3

[0192] Example 3 differs from Example 1 in that: water agent of step (4-1) of the feed amount of the extraction 9.3kg / h.

[0193] Oxide obtained in the final product, the content of ethylene oxide was 99.99 wt%, methanol content of 1 ppm or by weight, the weight content of 4ppm ester, aldehyde content of 18ppm by weight, the weight of an acetone content of 1 ppm or, from the second methanol fractionator bottoms effluent and ethanol was used as a distillation column bottom stream into the waste output processing unit for processing the waste water, wherein the amount of waste water was 50.5kg / h. With respect to the propylene oxide epoxidation reaction product stream, and recovery of propylene oxide was 99.7%.

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Abstract

The invention discloses an epoxypropane material flow separation method, an epoxidation reaction product separation method and a propylene epoxidation method. The epoxypropane material flow separation method comprises the following steps: rectifying the epoxypropane material flow in a methanol rectifying tower, and under an extractive distillation condition, making contact between crude epoxypropane extracted from the tower top of a methanol rectifying tower an an extracting agent in an extractive distillation tower to obtain an epoxypropane product and an extract containing a small amount of epoxypropane, rectifying the extract in an epoxypropane rectifying tower at a tower kettle temperature of lower than 100 DEG C to obtain the epoxypropane, obtaining recovered epoxypropane from the tower top of the epoxypropane rectifying tower, and feeding at least part of the recovered epoxypropane into a methanol rectifying tower and/or an extraction rectifying tower to be separated. According to the refining method, impurities, especially methanol, in the crude epoxypropane can be effectively removed with a relatively low use amount of the extracting agent, and a low-temperature heat source can be adopted as a heat source of a reboiler of the extractive distillation tower.

Description

technical field [0001] The present invention relates to a method for separating propylene oxide streams, and also relates to a method for separating epoxidation reaction products, and the present invention further relates to a method for propylene epoxidation. Background technique [0002] Propylene oxide (PO) is the third largest raw material of propylene-derived organic compounds after polypropylene and acrylonitrile, and is mainly used in the production of polyether and propylene glycol. It is also the main raw material of the fourth-generation detergent non-ionic surfactant, oil field demulsifier, pesticide emulsifier, etc. Propylene oxide derivatives are widely used in industries such as automobiles, construction, food, tobacco, medicine and cosmetics. [0003] Propylene oxide production processes mainly include chlorohydrin method, co-oxidation method (also called indirect oxidation method) and direct oxidation method. The chlorohydrin method has a long history of pr...

Claims

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Application Information

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IPC IPC(8): C07D301/32C07D303/04C07D301/12
CPCC07D301/32C07D303/04C07D301/12
Inventor 李红波王皓王瑾丁晖殿林民罗一斌朱斌
Owner CHINA PETROLEUM & CHEM CORP
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