Trimethylbenzene separation method

Abstract

The invention relates to a trimethylbenzene separation method to mainly solve technical problems of long flow and high cost of previous separation of trimethylbenzene monomers from a heavy aromatic hydrocarbon material containing propylbenzene, methylethylbenzene and butylbenzene. The method, which adopts a technical scheme that the heavy aromatic hydrocarbon material which is C9 aromatic hydrocarbons with the content of aromatic hydrocarbons except trimethylbenzene being less than 0.5% sequentially enters a 1,3,5-trimethylbenzene tower and a 1,2,4-trimethylbenzene tower for being rectified and separated to obtain 1,3,5-trimethylbenzene products and 1,2,4-trimethylbenzene products, well solves the problems, and can be applied to the industrial production of trimethylbenzene.

Description

technical field [0001] The invention relates to a method for separating trimethylbenzene. Background technique [0002] Heavy aromatics include by-products of carbon nine and above aromatics in steam cracking units and refinery continuous reforming units, which are valuable petrochemical resources, especially reforming heavy aromatics. With the successive production of continuous reforming units in large petrochemical enterprises in my country in recent years, the output of reformed heavy aromatics has increased rapidly. In the production of xylene (PX), a considerable part of it enters the production plant for the comprehensive utilization of heavy aromatics for processing and application, and is used to extract components such as mesitylene, p-trimethylbenzene, para-trimethylbenzene, and methylethylbenzene. [0003] Foreign countries have started to use this part of resources to produce fine chemical products on a large scale since the separation of p-trimethylbenzene from...

AI Technical Summary

Problems solved by technology

Heavy aromatics from reforming units generally contain higher levels of C 9 Aromatics, its content is generally greater than 30%. CN1313269A needs to carry out continuous rectification to separate the higher-purity mesitylene fraction from the heavy aromatics from the refinery reforming unit through two packed towers, but can not obtain higher-purity mesitylene fractions. toluene

CN1974500A uses a three-tower serial process to separate reformed heavy aromatics, which can produce high-purity mesitylene and co-produce enriched mesitylene with a purity of more than 35%, and the purity of mesitylene is low

Therefore, in the prior art, the technological process for separating and producing mesitylene and mesitylene is relatively long, the process is complicated, and the yield is low, the production cost is high, and the industrial application is difficult.

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