Technique for separating cyclopentadiene and methylcyclopentadiene

Abstract

The invention relates to a separation technology of a mixture with cyclopentadiene and methyl cyclopentadiene as main ingredients, which pertains to the fine chemicals manufacturing technical field. A mixture with main ingredients of CPD and MCPD is firstly extracted from the mixture with cyclopentadiene and methyl cyclopentadiene as main ingredients from the top of a de-polymerization rectifying tower; the mixture with the main ingredients of CPD and MCPD then enters a CPD tower, and CPD is extracted from the top of a normal pressure rectifying tower; materials at the bottom of the CPD tower enter a dimerization reactor, and a mixture material with DMCPD as a main ingredient is acquired; the mixture material enters a MCPD tower to be rectified under reduced pressure, and the methyl cyclopentadiene is extracted from the top of the MCPD tower in the form of DMCPD. The invention adopts a de-polymerization normal reduced pressure separation method, which requires little supportive equipment investment and simple operation technique and can effectively overcome defects of the prior art, reduce product waste during the mixture separation process, improve extraction rate by one operation and reduce energy consumption, so that the cyclopentadiene and methyl cyclopentadiene of relatively high purity can be obtained.

Description

Technical field: [0001] The invention relates to a separation process of a mixture of cyclopentadiene and methylcyclopentadiene as main components in the field of fine chemical production technology, and obtains cyclopentadiene and methylcyclopentadiene with higher purity through the new separation process Diene. Background technique: [0002] In the process of preparing methylcyclopentadiene industrially, or in the process of separating and preparing cyclopentadiene and methylcyclopentadiene from the C5 fraction, it usually involves the synthesis of cyclopentadiene and methylcyclopentadiene. The problem of separating a mixture with pentadiene as the main component to obtain cyclopentadiene and methylcyclopentadiene with higher purity. [0003] Said cyclopentadiene here refers to the general term of cyclopentadiene monomer and cyclopentadiene dimer; said methyl cyclopentadiene refers to methyl cyclopentadiene monomer and methyl cyclopentadiene Generic term for diene dimers...

AI Technical Summary

Problems solved by technology

The disadvantage of the dimerization decompression separation method is that a large amount of copolymer CPD-MCPD will be generated in the dimerization process, which cannot be effectively utilized, consumes a part of cyclopentadiene and methylcyclopentadiene, and reduces Product output

The disadvantage of depolymerization atmospheric pressure separation method is that about half of MCPD will form methylcyclopentadiene dimer (DMCPD) in the atmospheric rectification process of tower 12 and tower 15, and DMCPD cannot be used as product Take out in time, and the material that can only be reclaimed enters the depolymerization rectification column 9 depolymerization and carries out secondary cycle separation after depolymerization, has reduced the primary extraction rate of whole device methylcyclopentadiene like this, has increased energy consumption; Secondly , the material is heated for many times for a long time in multiple cycles, which increases the chance of forming polymers and increases product loss

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