A kind of depropylene, deoxidation process

Abstract

The invention provides a propylene removal and deoxygenation process, which comprises the steps that propylene and hydrogen peroxide take a reaction in a propylene oxide reactor; materials at an outlet of the propylene oxide reactor enter a high-pressure rectifying tower so that propylene is obtained from the tower top of the high-pressure rectifying tower; materials at a tower kettle of the high-pressure rectifying tower enter a low-pressure stripping tower, so that the propylene is further separated; meanwhile, oxygen is removed. The process provided by the invention has the advantages that the propylene recovery flow process is simplified; the single arrangement of oxygen stripping tower and the high-pressure nitrogen gas supply are not needed; compared with the existing propylene removal multistage flash evaporation and multistage compression process, the propylene removal and deoxygenation process has the advantages of operation simplicity, short flow process and high system safety; the equipment investment can be reduced; the technology competitiveness is improved.

Description

technical field [0001] The invention relates to a process of depropylene and deoxygenation, in particular to the process of separating propylene from the reaction product in the process of epoxidizing propylene with hydrogen peroxide to produce propylene oxide and removing dissolved oxygen. Background technique [0002] The production process of propylene oxide by epoxidizing propylene with hydrogen peroxide uses methanol as a solvent, and under the action of a certain temperature, pressure and catalyst, propylene and hydrogen peroxide undergo an oxidation reaction to generate propylene oxide. In order to completely convert hydrogen peroxide, the reaction process of excessive propylene is usually adopted, and the excess propylene in the reaction product liquid needs to be recovered; hydrogen peroxide is partially decomposed during the reaction process to generate oxygen, and is dissolved in a large amount in the reaction product liquid under high pressure conditions. Dissolv...

AI Technical Summary

Problems solved by technology

[0003] In the existing process, in order to avoid the safety hazards caused by the flash enrichment of oxygen, the oxygen is generally removed through a specially set oxygen stripper, which requires a large amount of high-pressure nitrogen to dilute the oxygen continuously, and the nitrogen consumption is large , the propylene content in the stripping gas is high, and a large post-processing system is required; in order to recover the excess propylene in the reaction liquid, traditional rectification and multi-stage decompression flash distillation processes are often used, and the flash propylene is recovered through a compression system , this process is relatively long, the equipment investment is high, and the operation is complicated

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