High-efficiency polymerization inhibitor for extracting and separating C5 by DMF method and application method thereof

Abstract

The invention provides an efficient polymerization inhibitor for extracting and separating C5 by a DMF (Dimethyl Formamide) method. The inhibitor is prepared from the following components in parts bymass: 100 parts of 4-hydroxyl-TEMPO, 50 to 100 parts of ethylene glycol di-tert-butyl ether and 30 to 60 parts of ethylene glycol diformate. When the polymerization inhibitor is used, all raw materials of the polymerization inhibitor and a DMF solvent are made into a polymerization inhibitor solution, then a DMF circulating solvent is continuously or intermittently injected, and the polymerizationinhibitor solution is added into the DMF+C5 extraction system flow to play a role. The application effects of the polymerization inhibitor are as follows: the generation amount of oligomers is relatively low, deposition and scaling of polymers and reaction products are relatively slow, the maintenance period of a separation device can be prolonged to more than one year, the tar yield is remarkably reduced, and the generation amount of solid wastes during maintenance and scale removal is remarkably reduced, so that the operation cost of the C5 separation device is reduced; and the blockage andcleaning times of a filter are obviously reduced.

Description

technical field [0001] The invention relates to a rectification polymerization inhibitor, in particular to a high-efficiency polymerization inhibitor used for extracting and separating carbon five by DMF method and an application method thereof. Background technique [0002] In the process of producing ethylene by pyrolysis method, isoprene and cyclopentadiene in the by-product C5 fraction are important raw materials in the synthetic rubber industry, and are generally separated by extractive distillation process, including DMF method (N,N-di Methylformamide, also known as GPI method) and ACN method (acetonitrile), among which DMF method is more widely used. [0003] In the process of extracting and separating C5 by DMF method, the C5 fraction that removes dicyclopentadiene and heavy components is separated through the first extractive distillation tower, the second extractive distillation tower and multiple stripping towers to obtain polymerization grade isoprene, piperylen...

AI Technical Summary

Problems solved by technology

[0007] DMF method C5 separation device, under the condition of proper application of polymerization inhibitor with 4-hydroxy-TEMPO as the main component, the fouling is slow and the filter is less clogged, and the maintenance period of the separation device can be extended to more than half a year, but It is still difficult to achieve a device maintenance cycle of more than one year, and a certain amount of solid waste will still be generated

When the separation device is overhauled, it is cumbersome and difficult to clean and replace the heaters and trays, and the operating conditions are poor. The workload of disassembly and assembly is heavy. There are also more difficulties in the process of driving

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