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Method used for heavy arene light formation and alkyl transfer

A technology for heavy aromatics and transalkylation, applied in chemical instruments and methods, hydrocarbon cracking to produce hydrocarbons, organic chemistry, etc. The effect of improving acid strength and acid content, and good technical effect

Active Publication Date: 2007-07-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The technical problem to be solved by the present invention is to overcome the low conversion rate of the single pure zeolite molecular sieve catalyst used in the lightening of heavy aromatics and transalkylation reactions in the prior art, the need to support precious metals and strict requirements on the composition of raw materials Technical problem, provide a new method for lightening and transalkylation of heavy aromatics

Method used

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  • Method used for heavy arene light formation and alkyl transfer
  • Method used for heavy arene light formation and alkyl transfer
  • Method used for heavy arene light formation and alkyl transfer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0032] Synthesis of BEA / MOR intergrowth molecular sieve used in the present invention

[0033] The BEA / MOR symbiotic molecular sieve used is synthesized according to Chinese patent ZL 02120815.8.

[0034] According to a certain proportion, sodium aluminate (analytically pure, commercially available), silica sol (industrial product, content 25% by weight), tetraethylammonium bromide (content 98% by weight, chemically pure), ammonia water (containing NH 3 25% by weight, analytically pure, commercially available), tetraethylammonium hydroxide (content 25% by weight, commercially available), sodium fluoride (analytically pure, commercially available), sodium hydroxide (analytically pure, commercially available product) to form a reaction system, mix evenly, transfer to a stainless steel crystallization kettle, and crystallize at 140-160°C for 1-3 days. After the crystallization, suction filtration, washing, and drying were carried out to obtain BEA / MOR intergrowth molecular siev...

Embodiment 6～10

[0038] Take the five different BEA / MOR symbiotic molecular sieves prepared in Examples 1-5, and exchange them with 1.0 M ammonium nitrate solution at 90° C. for 4 hours at a constant temperature; after filtering, repeat 3 times, and wash the filter cake with deionized water. The filter cake was dried at 110°C to obtain ammonium-type BEA / MOR symbiotic zeolite molecular sieves A1, B1, C1, D1, and E1.

[0039] A1, B1, C1, D1, E1 were respectively calcined at 550°C for 4 hours to prepare hydrogen-form BEA / MOR symbiotic zeolite molecular sieves A2, B2, C2, D2, E2.

[0040] Take 77.8 grams each of A2, B2, C2, D2, and E2, and combine them with Na 2 42.9 grams of pseudo-boehmite with an O content of less than 0.15% and a weight loss on ignition of 30% and an appropriate amount of extrusion aid scallop powder are mixed evenly, and 2 milliliters of chemically pure nitric acid and 60 milliliters of deionized water are added, fully mixed, kneaded, and carried out The catalysts A, B, C, D...

Embodiment 11

[0042] Take the BEA / MOR symbiotic molecular sieve prepared in Example 1, and exchange it with 1.0 M ammonium chloride solution at 90° C. for 2 hours at a constant temperature; after filtering, repeat 3 times, and wash the filter cake with deionized water. The filter cake was dried at 110°C to obtain ammonium-type BEA / MOR co-generated zeolite molecular sieve F1.

[0043] Take 44.4 grams of F1 molecular sieve and γ-Al 2 o 3 85.7 grams and an appropriate amount of extrusion aid Selina powder are mixed uniformly, add 2 milliliters of chemically pure nitric acid, and 60 milliliters of deionized water, fully mix, knead evenly, carry out extruding molding, drying, pelletizing, roasting and activating, and catalyst F is obtained .

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Abstract

This invention relates to a method of lighting heavy aromatic hydrocarbon and alkyl transfer. Mainly to solve existing technologies problems, such as low conversion rate and needing precious metal when use solo pure zeolite molecular sieve catalyst, and raw materials and components demanding. This invention takes carbon 9 and above aromatic hydrocarbon as raw material, in the fixed-bed reactor, use symbiotic molecular sieve that contains 10 ~ 80% (weight) of beta zeolite and Mordenite, and 20 ~ 90% (weight) inorganic binder composition of the catalyst that at least one selected from the gamma-Al2O3, thin diaspore, silica, silicon oxide, alumina oxide, bentonite, kaolin, diatomite or montmorillonite. Take reaction under the conditions of the reaction temperature 300 to 500 deg, pressure of 1.0 to 3.5MPa, raw materials weight space velocity of 1.5 ~ 6 .0 per hour, hydrogen and hydrocarbon molar ratio of 2.0 to 6.0 to obtain product containing benzene, toluene and xylene.

Description

technical field [0001] The invention relates to a method for lightening and transalkylation of heavy aromatic hydrocarbons. Especially about the method of lightening and transalkylation of heavy aromatics with carbon nine and above. Background technique [0002] Heavy aromatics (or heavy aromatics) refer to the by-products of carbon nine and above aromatics in the process of petroleum and coal processing, mainly from the by-products of light oil cracking to produce ethylene; aromatics extracted from catalytic reforming in refineries; polyester raw material plants Distillate catalytic reforming unit by-product C 10 (C10) heavy aromatics; by-products of toluene disproportionation and transalkylation units; by-products of ethylene tar from ethylene units. With the increase of refining capacity, the construction of a large-scale ethylene production base with a million tons level and the large-scale aromatics complex, the output of heavy aromatics has been very considerable. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/06C07C15/04C07C15/06C07C15/08B01J29/06
CPCY02P20/52
Inventor 祁晓岚朱志荣王东辉孔德金
Owner CHINA PETROLEUM & CHEM CORP
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