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Method for converting heavy aromatics to light aromatics and transferring alkyl radical

A technology for lightening heavy aromatics and transalkylation, which can be used in chemical instruments and methods, organic chemistry, hydrocarbons, etc., and can solve problems such as low reactivity

Active Publication Date: 2010-11-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of low activity of heavy aromatics lightening and transalkylation in the past, and a new method for lightening heavy aromatics and transalkylation is provided

Method used

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  • Method for converting heavy aromatics to light aromatics and transferring alkyl radical
  • Method for converting heavy aromatics to light aromatics and transferring alkyl radical
  • Method for converting heavy aromatics to light aromatics and transferring alkyl radical

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055]5 grams of PDDA (20%wt) was dissolved in 495 milliliters of deionized water and stirred evenly, 320 grams of ZSM-5 former powder was added in this surface modifier solution, the temperature was raised to 30°C under stirring and kept for 3 hours, filtered and After drying in the air atmosphere at 100°C, add it to the zeolite beta nanocrystal suspension for pre-adhesion for 120 minutes, filter and dry in the air atmosphere at 100°C to obtain the treated ZSM-5 powder. Zeolite beta can be obtained after 40 grams of tetraethyl orthosilicate, 8 grams of sodium aluminate, 18 grams of sodium chloride, 6 milliliters of sulfuric acid, 20 milliliters of tetraethylammonium hydroxide, 10 milliliters of ammonia and 400 milliliters of water are evenly gelled. Molecular sieve synthesis system. Add 320 grams of treated ZSM-5 powder into the gelling solution and stir for 2 hours. The mixed system was transferred into a polytetrafluoroethylene-lined stainless steel crystallization kettle,...

Embodiment 2～7

[0060] Examples 2-7 are based on the synthesis ratio and synthesis conditions in Table 1, and are synthesized according to the similar method and steps of Embodiment 1 to obtain core-shell molecular sieves CS2-7, see Table 1 for details.

[0061] Table 1 Preparation conditions of core-shell molecular sieves

[0062]

Embodiment 8～19

[0064] In Examples 8-19, hydrogen-type core-shell molecular sieve catalysts HCS-Cat8-13 and modified core-shell-type molecular sieve catalysts MCS-Cat8-19 were prepared in a similar manner to Example 1.

[0065] Table 2 Preparation conditions of hydrogen-type core-shell molecular sieve catalysts

[0066] Example number

Core-shell molecular sieve catalyst

Core-shell molecular sieve number

binder

Molecular sieve: binder, ratio %

Example 8

HCS-Cat8

CS2

Al 2 o 3

95∶5

Example 9

HCS-Cat9

CS3

Al 2 o 3

60∶40

Example 10

HCS-Cat10

CS4

Al 2 o 3

45∶55

Example 11

HCS-Cat11

CS5

Al 2 o 3

70∶30

Example 12

HCS-Cat12

CS6

SiO 2

5∶95

Example 13

HCS-Cat13

CS7

SiO 2

50∶50

[0067] Table 3 Preparation conditions of modified core-shell molecular sieve catalysts

[0068]

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Abstract

The invention relates to a method for converting heavy aromatics to light aromatics and transferring an alkyl radical, which mainly solves the problem of low activity during the reaction of converting the heavy aromatics to the light aromatics and transferring the alkyl radical in the presence of a conventional catalyst. In the invention, a new method for converting the heavy aromatics to the light aromatics and transferring the alkyl radical is adopted, wherein the catalyst comprises the following components in part by weight: a) 5 to 95 parts of nuclear-shell molecular sieve material and b)95 to 5 parts of adhesive; the nuclear phase of the nuclear-shell molecular sieve is ZSM-5; and the shell layer is beta zeolite grains with coverage of between 50 and 100 percent. The technical scheme solves the problem better and the method can be used in the industrial production of converting the heavy aromatics to the light aromatics and transferring the alkyl radical.

Description

technical field [0001] The invention relates to a method for lightening heavy aromatics and transalkylation. Background technique [0002] In recent years, heavy aromatics C 9 + A (carbon nine and above aromatics) has become an important resource for the production of light aromatics. The dealkylation technology of heavy aromatics, as an important means to improve the utilization rate of heavy aromatics and adjust the balance between supply and demand of xylene, has attracted more and more attention from scholars at home and abroad. . The lightening of heavy aromatics mainly produces benzene, toluene, xylene, etc., which can partially alleviate the demand gap for PX. Therefore, the development of a new process for the production of mixed xylenes from heavy aromatics to light weight, and the simultaneous by-production of tetramethylbenzene mixture and liquefied gas can make full use of all heavy aromatics resources, meet the needs of p-xylene capacity expansion, and give f...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C15/06C07C15/04C07C4/18C07C6/12B01J29/70B01J29/78B01J29/74B01J35/10
CPCY02P20/52
Inventor 祁晓岚孔德金周亚新张惠明
Owner CHINA PETROLEUM & CHEM CORP
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