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Method of cracking multi-production of trimethylbenzene with C9 and above heavyweight aromatic hydrocarbon ingredients

A technology for heavy aromatics and trimethylbenzene, applied in chemical instruments and methods, isomerization hydrocarbon production, distillation purification/separation, etc., can solve the difficulty of processing and harsh process, low content of trimethylbenzene, and cannot be transferred to produce BTX and trimethylbenzene Toluene and other issues

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

with reformed C 9 Aromatic feedstock compared to cracking C 9 The content of trimethylbenzene available for transalkylation in aromatics is low, and it is lower than reforming C 9 Aromatics have complex composition, high impurity content, higher processing difficulty and harsher process, thus making cracking C 9 Cannot directly produce BTX and mesitylene through simple transalkylation

Method used

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  • Method of cracking multi-production of trimethylbenzene with C9 and above heavyweight aromatic hydrocarbon ingredients

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Highly non-aromatic cracking C 9 + As raw material (toluene content is 3.1 tons / hour), using figure 1 craft technology. Reaction unit, reaction pressure 2.8 MPa, reaction temperature 340 °C, hydrogen partial pressure 1.14 MPa; stripping tower is a 44-layer float valve tray, the operating pressure at the top of the tower is 0.7 MPa, the control temperature of the top separator is 40 °C, discharge Non-condensable gas, in which the molar concentration of ethane is 23.3%, the molar concentration of propane is 63.3%, and other light hydrocarbons are 13.4mol%. The benzene tower adopts 55 layers of valve trays, the operating pressure at the top of the tower is 0.05MPa, and 8.4 tons / hour of benzene product with a purity of 99.95wt% is obtained at the top of the tower. The toluene tower adopts 55 layers of valve trays, the operating pressure at the top of the tower is 0.05MPa, and 14.2 tons / hour of toluene product with a purity of 99.9wt% is obtained at the top of the tower. ...

Embodiment 2

[0028] use C 9 And above heavy aromatics group cracking method to produce more trimethylbenzene, with the high non-aromatic cracking C after two-stage hydrogenation 9 + As the raw material (see Table 1 for the raw material conditions), the raw material is purified, mixed with hydrogen, heated to 300 ° C, and then enters a fixed-bed reactor equipped with a zeolite catalyst loaded with noble metal Zn for reaction to generate trimethylbenzene-rich aromatics and Reaction product of light alkane components. Reactor operating conditions: weight space velocity is 2h -1 , the hydrogen / hydrocarbon feedstock molar ratio is 2:1, the reaction inlet temperature is 380°C, and the reaction pressure is 4.5MPa.

[0029] The reaction product is condensed into a gas phase and a liquid phase. The gas phase product mainly contains low-carbon alkanes and hydrogen, and the liquid phase product contains non-aromatic hydrocarbons; the liquid phase product containing non-aromatic hydrocarbons enters...

Embodiment 3

[0032] Highly non-aromatic cracking C 9 + As raw material (toluene content is 3.0 tons / hour), using figure 1 craft technology. figure 1 C shown 9 In the process flow of decomposing heavy aromatics and producing more trimethylbenzenes, fresh raw material 1, hydrogen 2 and recycled raw material 3 enter the reaction unit Ⅰ, and the reaction product 4 enters the product separator Ⅱ for vapor-liquid separation, and the separated reaction liquid 6 Enter the stripping tower III, get LPG at the top of the stripping tower, the feed 8 of the BTX tower comes from the bottom of the stripping tower, extract BTX from the top of the BTX tower IV, and get mesitylene and para-trimethylbenzene at the top of the trimethylbenzene tower V , part of the heavy carbon nine and above components 3 are returned to the reaction system, and part of the trimethylbenzene is extracted from the tower kettle 12 .

[0033] Reaction unit, reaction pressure 2.8 MPa, reaction temperature 340°C, hydrogen partia...

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Abstract

The invention relates to a method of catalytic cracking multi-production of trimethylbenzene with C9 and above heavyweight aromatic hydrocarbon ingredients. The method mainly solves the problems that a lightweight aromatic hydrocarbon product contains much toluene, and separated heavyweight aromatic hydrocarbon and non-aromatic hydrocarbon are lower in use value since BTX (B: Benzene, T: Toluene, and X: Xylol) aromatic hydrocarbon is just simply separated in a traditional gasoline cracking and C9 reforming process. With the adoption of the technical scheme that a C9<+> heavyweight aromatic hydrocarbon raw material is subjected to hydrodealkylation and performs transalkylation reaction with lightweight aromatic hydrocarbon in the presence of a catalyst, trimethylbenzene in C9 aromatic hydrocarbon is gathered, light hydrocarbon, BTX, mesitylene and pseudocumene, C9 and hemimellitene fractions are separated from a liquid phase product respectively according to different boiling points, and C9 and hemimellitene can return to be processed continuously as a feed material, the method better solves the technical problems, and can be used for industrial production of heavyweight aromatic hydrocarbon.

Description

technical field [0001] The present invention involves the use of C 9 And the above heavy aromatics group cracking method to produce more trimethylbenzene. Background technique [0002] BTX is an important organic chemical basic raw material for petrochemical industry. BTX, B is benzene, T is toluene, X is xylene. Heavy aromatics include C by-products from steam crackers and refinery continuous reforming units 9 The above aromatics, mainly C 9 and C 10 Aromatics are valuable petrochemical resources, especially the reformed heavy aromatics that are by-products in the catalytic reforming process, accounting for about 4% of the catalytic reforming feedstock in the refining process. Reformed heavy aromatics contain almost no olefins, have good stability, and can be further processed and utilized. Heavy aromatics in the continuous reforming unit can generate aromatics such as benzene, toluene and xylene (BTX) through transalkylation or dealkylation, and a considerable part o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/02C07C4/18C07C5/27C07C7/04C07C9/02
Inventor 贺来宾李木金杨卫胜施德
Owner CHINA PETROLEUM & CHEM CORP
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