Process for preparing mixed xylene with high-concentration p-xylene and benzene by toluene shape-selective disproportionation

A p-xylene, high-concentration technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve problems such as short circuit, catalyst poisoning, and poor adaptability of radial reactors, and achieve good technical results and toluene conversion The effect of increasing the rate and improving the effective utilization rate

Active Publication Date: 2009-05-27
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 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 is The shortcoming that the reaction gas is easy to cause a short circuit provides a new method of toluene shape-selective disproportionation to produce mixed xylene and benzene containing high concentrations of p-xylene

Method used

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  • Process for preparing mixed xylene with high-concentration p-xylene and benzene by toluene shape-selective disproportionation
  • Process for preparing mixed xylene with high-concentration p-xylene and benzene by toluene shape-selective disproportionation
  • Process for preparing mixed xylene with high-concentration p-xylene and benzene by toluene shape-selective disproportionation

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Embodiment 1

[0023] The catalytic reaction of toluene under 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 ZSM-5 molecular sieve. The diameter of the distribution cylinder in the reactor is 1000 mm, the radial thickness of the bed is 800 mm, and the total static height is 10000 mm. 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 in the shape of a triangle, and the angle α of the triangle penetrating 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 420° C., the pressure was 1.5 MPa, and the arom...

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Abstract

The invention discloses a manufacturing method of composite xylene and benzene, which is characterized by the following: blending toluene with high-density paraxylene under hydrogen condition; adopting radial and axial reactor with axial segment on the radial segment; connecting a ring-shaped flange of deep catalyst layer on the inner segment wall of cylinder; avoiding gas short-circuit phenomenon; fitting for industrial manufacturing of aromatic hydrocarbons.

Description

technical field [0001] The invention relates to a method for producing high-concentration p-xylene and benzene by shape-selective disproportionation 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 shape-selective disproportionation of toluene is a new process gradually developed after the 1980s and 1990s. Toluene is selectively disproportionated on the modified ZSM-5 catalyst to generate benzene and C with high p-xylene concentration. 8 A (carbon eight aromatic hydrocarbon...

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沈伟
Owner CHINA PETROLEUM & CHEM CORP
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