Treatment method for waste gas generated in process of producing epoxy chloropropane through chloropropene epoxidation

Abstract

The invention discloses a treatment method for waste gas generated in the process of producing epoxy chloropropane through chloropropene epoxidation. The method comprises the following steps: treatingwaste gas generated in the process of preparing epoxy chloropropane through epoxidation reaction of a reaction control phase transfer catalyst, hydrogen peroxide and chloropropene, wherein the wastegas contains nitrogen, oxygen, chloropropene and water vapor; the nitrogen is added into a gas-phase buffer tank (V1)at the top of a reactor (R1)to dilute tail gas, the diluted tail gas passes througha first-stage condenser (E1), a second-stage condenser (E2)and a third-stage condenser (E3)to recover condensed chloropropene and condensate water and then enters a membrane filter (M1)to filter a chloropropene-containing gas, and the chloropropene-containing gas is compressed to recover the chloropropene; an inorganic matter-containing gas filtered by the membrane filter (M1)is condensed by a four-stage condenser (E4)to recover trace chloropropene in the inorganic matter-containing gas so as to reach the emission standard.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a treatment method for waste gas produced in the process of producing epichlorohydrin by epoxidation of propylene chloride. Background technique [0002] Compared with the traditional production process, the process of preparing epichlorohydrin by reaction-controlled phase transfer catalyst, hydrogen peroxide, and allyl chloride epoxidation reaction is a new green and environmentally friendly process, but the tail gas produced during the reaction process contains nitrogen, oxygen, allyl chloride and Water vapor is a kind of organic waste gas. With the increasing emphasis on environmental protection in recent years, the treatment of organic waste gas has become an important aspect of economic development and environmental protection. [0003] CN103159703B introduces a method for the direct epoxidation of allyl chloride to continuously produce epichlorohydrin. The ...

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Problems solved by technology

[0003] CN103159703B introduces a method for the direct epoxidation of allyl chloride to continuously produce epichlorohydrin. The tail gas produced by this method is obviously unable to meet the current organic tail gas treatment requirements only by condensing and recovering allyl chloride.

[0004] CN105712955B introduces a process flow for the production of epichlorohydrin by epoxidation of allyl chloride. The tail gas produced by the process is condensed to recover most of the allyl chloride in the tail gas, and then processed by pressurized secondary condensation. The content of allyl chloride in the tail gas ≤0.5v%, it is obviously not able to meet the current organic tail gas treatment requirements

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