Trimethylbenzene separation method

A technology for mesitylene and mesitylene is applied in the field of separation of mesitylene, which can solve the problems of difficult industrial application, complicated process, low purity of mesitylene, etc.

Inactive Publication Date: 2012-10-24
CHINA PETROLEUM & CHEM CORP +1
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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

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Embodiment 1～3

[0017] Binder-free ZSM-5 zeolite (SiO 2 / Al 2 o 3 The molar ratio is 60) It is prepared with reference to the Chinese patent CN1915820, and is converted into hydrogen-type zeolite by roasting after ion exchange with ammonium nitrate solution. The catalyst is obtained by impregnating 0.05% of Pt and 0.25% of Zn in the loading weight ratio on the hydrogen-type binderless ZSM-5 zeolite, and calcining at 450°C. After catalyst activation, adopt the raw material of table 1, be 400 at hydrogen oil volume ratio (v / v), reaction pressure is 2.8MPa, weight hourly space velocity is 2.1 hours -1 , under the condition that the reaction temperature is 370° C., the raw materials in Table 1 are subjected to hydrocracking treatment, and the composition of the obtained products is shown in Table 1. cracked products according to figure 1 The process first enters the stripping tower, the top of the stripping tower gets non-condensable tail gas and liquid light hydrocarbons, the bottom material...

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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...

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Application Information

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IPC IPC(8): C07C15/02C07C15/04C07C15/06C07C15/08C07C7/04
Inventor 王德举刘仲能王辉唐之勤
Owner CHINA PETROLEUM & CHEM CORP
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