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 capacity and energy consumption of the circulation system (such as: liquid delivery equipment such as pipelines and pumps) and the methanol refining system (such as: methanol rectification tower)
At the same time, since the extractant is usually water, it also leads to an increase in the final waste water generation, which is not conducive to environmental protection

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

Embodiment 1

[0147] (1) methyl alcohol is mixed with propylene and hydrogen peroxide (hydrogen peroxide content is 50% by weight) according to propylene: hydrogen peroxide: the mol ratio of methyl alcohol is 2:1:8, and mixture is fed into and packed with epoxidation catalyst ( The model purchased from Sinopec Catalyst Changling Branch Company is the epoxidation catalyst of HPO-1, which is a hollow titanium-silicon molecular sieve catalyst) in the tubular fixed-bed reactor (diameter φ25mm inside the pipe, length is 4m) , contact with the epoxidation reaction catalyst to carry out the epoxidation reaction, wherein the temperature in the fixed bed reactor is controlled to be 45°C, and the liquid hourly volume space velocity is 0.2h in terms of hydrogen peroxide -1 , an epoxidation reaction product stream is obtained from the top of the epoxidation reactor. In the epoxidation reaction product stream, the content of methanol was 62.2% by weight, the content of propylene oxide was 13.2% by weigh...

Embodiment 2

[0184] The difference between embodiment 2 and embodiment 1 is that in step (3-1), the rectification condition of the methanol rectification tower is adjusted: the reflux ratio is 1.2.

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

[0186] In the finally obtained propylene oxide product, the content of propylene oxide is 99.98% by weight, the weight content of methanol is 19ppm, the weight content of ester is 7ppm, the weight content of aldehyde is 23ppm, and the weight content of acetone is 4ppm. The recovery of propylene oxide relative to the propylene oxide in the epoxidation reaction product stream was 99.8%.

Embodiment 3

[0192] The difference between embodiment 3 and embodiment 1 is: the feed rate of extractant water in step (4-1) is 9.3kg / h.

[0193] In the propylene oxide product that finally obtains, the content of propylene oxide is 99.99% by weight, and the weight content of methyl alcohol is 1ppm, and the weight content of ester is 4ppm, and the weight content of aldehyde is 18ppm, and the weight content of acetone is 1ppm, from the second The tower bottom effluent of the methanol rectification tower and the tower bottom effluent of the ethanol rectification tower are output as waste water into the waste water treatment unit for treatment, wherein the amount of waste water is 50.5 kg / h. The recovery of propylene oxide relative to the propylene oxide in the epoxidation reaction product stream 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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