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Benzene and C9 and more than that arene transalkylation method

A technology of aromatic hydrocarbon alkylation and transfer method, which is applied in the direction of chemical instruments and methods, hydrogenation of hydrocarbons, hydrocarbons, etc., can solve the problem of lack of stability of zeolite metal modified catalyst, inability to effectively utilize heavy aromatic hydrocarbons, and unfavorable aromatic hydrocarbons Combined device and other issues to achieve the effect of easy industrialization, convenient operation and simple equipment

Inactive Publication Date: 2005-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increase in Ben volume, C 8 The reduction in A volume is clearly detrimental to the overall aromatics complex
These deficiencies have limited the development of such processes
[0007] Summarizing the above processes, it is not difficult to see that all these patents are aimed at one or some aspects of a specific toluene disproportionation and transalkylation catalyst, such as the transalkylation ability of heavy aromatics or the separation scheme of reaction products Made reasonable changes above, but still did not break through the limitations of the original Tatoray process ideas
Its common disadvantages are: using toluene or toluene and aromatics above carbon nine to produce carbon eight aromatics to increase the production of p-xylene, inevitably by-product benzene, and cannot effectively utilize heavy aromatics
The catalyst used in this patent is a hydrogen-type DGA zeolite without metal modification, and there is no report on the metal modification and catalyst stability of this zeolite

Method used

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  • Benzene and C9 and more than that arene transalkylation method
  • Benzene and C9 and more than that arene transalkylation method
  • Benzene and C9 and more than that arene transalkylation method

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Effect test

Embodiment 1～3

[0029] Sodium mordenite, sodium β zeolite and sodium ZSM-5 zeolite were prepared according to ZL89106793.0, USP3308069 and USP4441991 respectively. Three kinds of sodium zeolites are ion-exchanged with ammonium chloride or ammonium nitrate aqueous solution at 90-98°C for 1-8 hours respectively, the mother liquor is filtered off, ion exchange is repeated several times, then washed, and dried at 110°C to obtain ammonium-type zeolites. SiO of three ammonium type zeolites 2 / Al 2 o 3 25, 25 and 500 respectively. Three ammonium-type zeolites were combined with pseudoboehmite (α-Al 2 o 3 ·H 2 O) mixing, adding dilute nitric acid, ammonium molybdate and water, kneading evenly, extruding, drying at 110° C., pelletizing, and roasting at 550° C. to obtain catalysts A1, A2, and A3. The metal molybdenum content of the three catalysts is 4.0% by weight .

Embodiment 4

[0031] Commercially available sodium Y zeolite (SiO 2 / Al 2 o 3 =4), carry out ion exchange, kneading, molding, roasting by the method for embodiment (1~3), make catalyst A4, the metal molybdenum content of catalyst A4 is 4.0% by weight.

Embodiment 5～7

[0033] Sodium-type MCM-22 zeolite, sodium-type MCM-49 zeolite and sodium-type MCM-56 zeolite were prepared according to USP4956514, USP5264643 and USP5453554 respectively. Three kinds of sodium zeolites are ion-exchanged with ammonium chloride or ammonium nitrate aqueous solution at 90-98°C for 1-8 hours respectively, the mother liquor is filtered off, ion exchange is repeated several times, then washed, and dried at 110°C to obtain ammonium-type zeolites. SiO of three ammonium type zeolites 2 / Al 2 o 3 30, 138 and 18 respectively. Three ammonium-type zeolites were combined with pseudoboehmite (α-Al 2 o 3 ·H 2 O) mixing, adding dilute nitric acid, ammonium molybdate and water, kneading evenly, extruding, drying at 110°C, pelletizing, and roasting at 550°C to obtain catalysts A5, A6, and A7, and the molybdenum content of the three kinds of catalysts is 4.0% by weight .

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Abstract

The present invention adopts benzene and C9 and higher aromatic hydrocarbons as raw material for reaction, in the fixed bed reactor and under the condition of hydrogenation uses the composition formed from zeolite in which the silicon-aluminium ratio is 3-500 and alumina as catalyst, on the zeolite metal molybdenum or / and its oxide and non-forced-added at least one metal selected from Fe, Co, Ni, Cr, W, Bi, La, Zr and Ag or / and oxide are loaded, under the conditions of that reaction temp. is 300-600 deg.C, pressure is 1.0-6.0 MPa, hydrogen and hydrocarbon mole ratio of 1-15 and weight space velocity WHSV is 0.5-5.0 hr.(-1) makes the above-mentioned materials produce reaction to produce methylbenzene and C8 aromatics.

Description

technical field [0001] The invention relates to a method for transalkylation of benzene, carbon nine and above aromatic hydrocarbons. Specifically, through benzene (Ben) and carbon nine and above aromatics (C 9 + The transalkylation reaction of A) generates toluene (Tol) and carbon eight aromatic hydrocarbons (C 8 A), feeding toluene selective disproportionation unit and C 8 A isomerization unit, used to increase the production of p-xylene. Background technique [0002] P-xylene 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 typical production method of paraxylene (pX) is through multi-stage cryogenic crystallization separation or molecular sieve simulated moving bed adsorption separation (referred to as Adsorption separation) technology to separate p-xylene from the isomer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/13C07C6/12C07C15/04
Inventor 孔德金邢宇
Owner CHINA PETROLEUM & CHEM CORP
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