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Process for toluene disproportionation and alkyl transfer

A technology of transalkylation and toluene disproportionation, which can be used in chemical instruments and methods, organic chemistry, hydrocarbons, etc., and can solve problems such as not being well utilized.

Active Publication Date: 2007-05-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is that there is a strict requirement C in the traditional toluene disproportionation technology 9 The indane content in the raw material feed of A cannot exceed 1%, and 5 to 15% of C should be lost in order to separate indane 9 A raw material, and rich in C 8 A raw material C 10 Hydrocarbons are also not well utilized, and to overcome the selective disproportionation of toluene, although high p-xylene concentrations can be obtained 8 A, but cannot process C 9 The problem of A is to provide a new method for toluene disproportionation and transalkylation, which has a high allowable indane content in the reactor feed, C in the raw material 9 There is no loss of raw materials in A, and C in raw materials 10 The hydrocarbon utilization rate is high, and the C produced by the reaction 8 The characteristic that the concentration of p-xylene in A is significantly higher than the thermodynamic equilibrium value

Method used

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  • Process for toluene disproportionation and alkyl transfer
  • Process for toluene disproportionation and alkyl transfer
  • Process for toluene disproportionation and alkyl transfer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0027] Toluene and C-enriched 9 The performance of the disproportionation and transalkylation reaction of the raw material of A is investigated. The inner diameter of the reactor is φ25 mm, the length is 1000 mm, and the material is stainless steel. The upper and lower sides of the catalyst bed are filled with φ3 mm glass beads for air distribution and support, and the reactor is filled with 20 grams of mordenite catalyst containing 2% by weight of bismuth oxide. The aromatic hydrocarbon raw material is mixed with hydrogen and passes through the catalyst bed from top to bottom, and toluene disproportionation and transalkylation reactions occur to generate benzene and C 8 A, and a small amount of C 5 The following non-aromatic hydrocarbons and C 10 and above hydrocarbons.

[0028] Aromatics raw materials come from petrochemical aromatics complex, H 2 For the electrolysis of hydrogen, after dehydration and drying treatment, the reaction results are listed in Table 1.

[002...

Embodiment 5～8

[0050] Carry out the toluene type-selective disproportionation reaction of the reaction products of Examples 1-4 with a fixed-bed reactor. The inner diameter of the reactor is φ25 mm, the length is 1000 mm, and it is made of stainless steel. The top and bottom of the catalyst bed are filled with φ3 mm glass beads for air distribution and support, and the reactor is filled with 20 grams of modified ZSM-5 toluene type-selective disproportionation catalyst. Aromatic raw materials are mixed with hydrogen and passed through the catalyst bed from top to bottom, and the toluene type-selective disproportionation reaction occurs to generate benzene and p-xylene-rich C 8 a. The reaction results are listed in Table 2.

[0051]

[0052]As can be seen from the data in Table 2, the reaction products of Examples 1 to 4 are used as the reaction raw materials of Examples 5 to 8, and the surface-modified ZSM-5 toluene type-selective disproportionation catalyst is further reacted to further...

Embodiment 9

[0054] Taking an aromatics complex as an example, the production capacity of p-xylene is 250,000 tons, and the capacity of the adsorption separation device of the right-hand downstream device is limited, and some heavy aromatics and toluene on the device cannot be fully utilized. After the application of the present invention, it can be seen from Examples 5 to 8 that the present invention can effectively increase the concentration of p-xylene in the generated mixed xylene. Taking Example 6 as an example, compared with the traditional method, the mixed xylene generated has increased by 7 percentages. After being mixed with the mixed xylene generated by other devices, it enters the adsorption separation, which can improve the mixed xylene in the adsorption separation feed. Concentration of one percentage point, so that the entire complex has the ability to increase the production of 10,000 tons of p-xylene, and can increase the economic benefits of the entire complex by 5 to 10 m...

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Abstract

The present invention provides one kind of toluene disproportionating and transalkylation process, and aims at relaxing the indane content requirement in C9A material and raising the C10 alkane utilization in C8A material. The present invention includes successive reactions on two kinds of zeolite catalyst under hydrogen condition to obtain reaction distillate as the mixing of C6-C9 arenes, C5- alkanes and C10+ hydrocarbons; separating the distillate, exhausting benzene and C8A, circulating toluene, separating the matter flow containing rich C9A and all the indane in the heavy arene tower to separate C11 and C11+ hydrocarbons and making the top liquid enter to the reaction area. The present invention obtains C8A with pX concentration obviously higher than thermodynamic balanced value, has the features of no C9A loss, high indane content tolerance and high C10 alkane utilization rate, and may be used in industrial production.

Description

technical field [0001] The present invention relates to a process for the disproportionation and transalkylation of toluene. Especially about the disproportionation of toluene and the transalkylation of toluene and C9 and above aromatic hydrocarbons. Background technique [0002] A large amount of benzene, toluene, xylene and C can be obtained in the process of reforming and cracking of petroleum fractions 9 Aromatics (C 9 A) and other aromatic raw materials. According to different boiling range petroleum fractions and processing methods, toluene and C 9 The content of A generally accounts for 40-50% of the total weight of aromatics. [0003] In recent years, due to the development of plastics, synthetic fibers and synthetic rubber industries, the demand for p-benzene and xylene has grown rapidly, and its market price is also higher than that of toluene and C 9 A is much higher. In order to make full use of aromatics resources, low-value a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C6/00C07C6/12
Inventor 孔德金李华英郭宏利杨卫胜
Owner CHINA PETROLEUM & CHEM CORP