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Method for producing dimethylbenzene and benzene through dismutation of toluene and transference of alkyl

A technology of alkylation transfer and toluene disproportionation, which is applied in the fields of chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems of poor adaptability of radial reactors, catalyst poisoning, short circuit of reaction gas, etc., and improve the effective utilization rate , conversion rate improvement, life-enhancing effects

Active Publication Date: 2008-08-27
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the poor adaptability of using radial reactors in the above-mentioned documents, the catalyst basket is easy to be poisoned in a large area, which affects the life of the catalyst or in the previous axial radial reaction process, due to radial and axial settlement, there are The shortcoming that the reaction gas is easy to cause a short circuit provides a new method for the production of xylene and benzene by disproportionation and transalkylation of toluene

Method used

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  • Method for producing dimethylbenzene and benzene through dismutation of toluene and transference of alkyl
  • Method for producing dimethylbenzene and benzene through dismutation of toluene and transference of alkyl
  • Method for producing dimethylbenzene and benzene through dismutation of toluene and transference of alkyl

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Embodiment 1

[0023] The catalytic reaction of toluene and carbon nine and above aromatics in hydrogen atmosphere is carried out with a set of equipment, and its production block diagram is shown as figure 1 . The reactor uses figure 2 In the reactor, the catalyst used is bismuth-containing mordenite. The diameter of the distribution cylinder in the reactor is 1200 mm, the radial thickness of the bed is 800 mm, and the total static height is 10000 mm. The shape of the flange 29 at the intersection of the axial section 26 of the reactor and the radial section 25 of the inner distribution cylinder 31 is triangular, and the angle α of the triangle that penetrates into the catalyst bed is 40 degrees, and the symmetry line of the apex angle is perpendicular to the inner distribution cylinder (that is, the β angle is 0), and the vertical height between the top of the flange and the inner distribution cylinder is 100 mm. The temperature of the reaction materials entering the reactor was 360° C...

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Abstract

This invention relates to a method for manufacturing dimethylbenzene and benzene by methylbenzene disproportionation and alkyl transfer in the presence of H2. The invention adopts an axial-radial reactor, whose axial part is on top of the radial part. A circular flange connected with the axial part of the inside distributor penetrates into the catalyst bed layer. The method takes the advantages of axial reactor and radial reactor, and can prevent the short circuit phenomenon of the gas caused by catalyst radial and axial subsidence, thus can utilize catalyst efficiently. The method can be used in dimethylbenzene industrial manufacture by methylbenzene disproportionation and alkyl transfer.

Description

technical field [0001] The invention relates to a method for producing xylene and benzene by disproportionation and transalkylation of toluene. Background technique [0002] Xylene is the raw material for the production of p-xylene, which is one of the main basic organic raw materials in the petrochemical industry. It is widely used in many chemical production fields such as chemical fibers, synthetic resins, pesticides, medicines, and plastics. The largest use of benzene is the production of styrene, cyclohexane and phenol, which account for 80% to 90% of the total benzene consumption, followed by nitrobenzene, maleic anhydride, chlorobenzene, and linear alkylbenzene. [0003] The process for the disproportionation and transalkylation of toluene to xylenes and benzene and the various catalysts used in the process are well known. Especially known is the toluene disproportionation and transalkylation process, wherein the disproportionation and transalkylation reactions are c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/08C07C15/04C07C6/12
Inventor 杨卫胜邵百祥张惠明吴文伟
Owner CHINA PETROLEUM & CHEM CORP
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