Efficient inhibitor for cracking gas alkali washing operation polymerization reaction

Abstract

The invention discloses a high-efficiency inhibitor for cracking gas alkali washing operation polymerization reaction, the inhibitor contains a synergist, the synergist is gamma-valerolactone, and the addition amount is 0.5-3 wt%. The inhibitor also contains a polymerization inhibitor, an antioxidant, a metal ion passivator, a dispersant and a solvent. The inhibitor comprises the following components in percentage by mass: 1 to 15 percent of polymerization inhibitor and antioxidant, 1 to 25 percent of polymerization inhibitor and solvent, 1 to 20 percent of dispersing agent and polymerization inhibitor, and the mass ratio of synergist to metal ion passivator to dispersing agent to solvent is (0.1 to 3): (1 to 50): (1 to 50): (1 to 100). The high-efficiency inhibitor for the cracking gas alkali washing operation polymerization reaction can effectively inhibit the polymerization reaction of trace carbonyl compounds such as aldehyde, ketone and alcohol, unsaturated olefin and the like in cracking gas in an alkali washing tower, and can dissolve generated butter polymers, so that the generated bulk polymers are dispersed and dissolved in alkali liquor to be discharged, and the polymerization reaction of the cracking gas alkali washing operation is realized. And the scaling blockage of the butter polymer on the packing of the alkaline washing tower is effectively reduced.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to an inhibitor for the polymerization reaction of carbonyl compounds such as aldol and unsaturated olefins in an alkali cleaning process of ethylene cracking gas. Background technique [0002] In the process of cracking hydrocarbons such as ethane, propane or naphtha to produce ethylene, in addition to producing a large amount of useful ethylene, propylene, butene and other substances, some acid gases such as carbon dioxide and hydrogen sulfide are also produced by-products, about 1ppm~ 1000ppm of trace carbonyl compounds such as aldehydes, ketones, alcohols and olefin compounds, these acid gases will cause catalyst poisoning and contamination of downstream products in the subsequent process. Therefore, the alkaline scrubbing operation in the cracking process is designed for acid gas removal. [0003] During the process of acid gas removal by pyrolysis gas alkali elution, a s...

AI Technical Summary

Problems solved by technology

Although the inhibitor considers the idea of ​​simultaneously inhibiting aldehyde and ketone condensation and olefin free radical polymerization, it does not mention that it has a dispersing effect on polymers, so there are limitations in the inhibition of butter and the rapid dispersion of polymers

The inhibitor invented by the patent CN 102531822A has an obvious polymerization inhibition effect, but does not mention the effect of reducing the COD value of the spent lye