Polymerization inhibitor used for inhibiting polymerization of petroleum cracked C5 fraction

Abstract

The invention relates to a polymerization inhibitor used for inhibiting polymerization of a petroleum cracked C5 fraction. The polymerization inhibitor consists of a component 1, a component 2, a component 3 and a solvent, wherein the component 1 is di methyl ketoxime; the component 2 is 2,2,6,6-tetramethyl-4-piperidinol; the component 3 is ortho-aminophenol; the solvent is acetonitrile or dimethylformamide; a weight ratio of the component 1 to the component 2 to the component 3 is 1:(0.1-2):(0.2-2.5); the component 1, the component 2 and the component 3 are 2 to 10 percent based on the weight of the solvent; and the using amount of the polymerization inhibitor in the petroleum cracked C5 fraction is 20 to 800ppm according to weight. The polymerization inhibitor provided by the invention has better polymerization inhibiting effect, can effectively inhibit auto polymerization or polymerization of diolefins in the petroleum cracked C5 fraction in a separating column, and avoids blockageof a reboiler; the using amount of the polymerization inhibitor is small and the production cost can be reduced; and the difference between boiling points of various components and the solvent of thepolymerization inhibitor and the boiling point of the petroleum cracked C5 fraction is great, so the petroleum cracked C5 fraction is easy to separate.

Description

technical field [0001] The invention relates to a polymerization inhibitor for inhibiting the polymerization of C5 fractions in petroleum cracking, in particular to a polymerization inhibitor for inhibiting olefin polymerization in the separation process of C5 fractions in petroleum cracking. Background technique [0002] C5 fraction is a by-product of cracking ethylene production, generally about 10% to 20% of ethylene production. my country's C5 resources have not been well utilized. Only a small part is used to produce ordinary C5 petroleum resin, or to produce dicyclopentadiene (DCPD) through simple separation, and most of them are burned as fuel, causing great waste. If the components in the C5 fraction are separated and a series of high value-added chemical products are produced through them, the cost of ethylene production can be greatly reduced, and the economic benefits and competitiveness of enterprises can be improved. [0003] The cracked C5 distillate is compos...

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Problems solved by technology

Considering the above points, the above-mentioned inhibitors are not very suitable

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