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Synthetic method and application for composite molecular sieve

A technology of composite molecular sieve and synthesis method, which is applied in the field of synthesis of composite molecular sieves, can solve the problems of poor stability and low catalytic activity of catalysts, and achieve the effects of stable structure, simple steps and good technical effects

Active Publication Date: 2018-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention relates to a synthesis method of a composite molecular sieve and its application in the C6-alkane cracking reaction, and mainly solves the problems of low catalytic activity and poor stability of the catalyst in the C6-alkane cracking reaction in the prior art

Method used

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  • Synthetic method and application for composite molecular sieve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) 600 grams of 40% silica sol, 10.1 grams of sodium aluminate (alumina content 42%), 41.6 grams of 30wt% tetraethylammonium hydroxide (TEAOH), 168.0 grams of tetraethylammonium bromide (TEABr), 16.0 grams of sodium hydroxide and 925.1 grams of water were mixed, stirred evenly at room temperature, and left to stand for 6 hours. Then crystallization was carried out at 200° C. for 48 hours.

[0023] (2) Take the milky white slurry obtained in the previous step, wash it 5 times with deionized water, and then vacuum-dry it for 12 hours.

[0024] (3) Take the solid obtained in the previous step and bake it in a muffle furnace at 550° C. for 6 hours.

[0025] Mix 20 grams of the synthesized mixed crystal molecular sieve with 20 grams of alumina, knead the mixed powder and dilute nitric acid (0.5% by weight) according to the weight ratio of 80:20, shape and dry. After calcining at 550° C. in air for 6 hours, the catalyst precursor of the present invention is obtained.

[0...

Embodiment 2

[0029] (1) Get 3.5g of aluminum tert-butoxide (wt97%), 160g of 30wt% tetraethylammonium hydroxide, 8g of sodium hydroxide mix, then add 160g TEOS (wt98%) and 140g deionized water therein, at room temperature Stir well and let stand for 4 hours. Then crystallization was carried out at 200° C. for 48 hours.

[0030] (2) Take the milky white slurry obtained in the previous step, wash it 5 times with deionized water, and then vacuum-dry it for 12 hours.

[0031] (3) Take the solid obtained in the previous step and bake it in a muffle furnace at 550° C. for 6 hours.

[0032] Mix 20 grams of the synthesized mixed crystal molecular sieve with 20 grams of alumina, knead the mixed powder and dilute nitric acid (0.5% by weight) according to the weight ratio of 80:20, shape and dry. After calcining at 550° C. in air for 6 hours, the catalyst precursor of the present invention is obtained.

[0033] The prepared catalyst precursor is ion-exchanged three times with 10 wt % ammonium nitra...

Embodiment 3

[0036] (1) Take silica sol (wt40%) 747.1g, sodium metaaluminate (alumina content 42%) 12.3g, 30wt% tetraethylammonium hydroxide 468.5g, deionized water 583.7g, mix, at room temperature Stir well. Adjust the pH to 13 with 10% aqueous sodium hydroxide solution and let stand for 6 hours. Then crystallization was carried out at 170° C. for 72 hours.

[0037] (2) Take the milky white slurry obtained in the previous step, wash it 5 times with deionized water, and then vacuum-dry it for 12 hours.

[0038] (3) Take the solid obtained in the previous step and bake it in a muffle furnace at 550° C. for 6 hours.

[0039] Mix 20 grams of the synthesized mixed crystal molecular sieve with 20 grams of alumina, knead the mixed powder and dilute nitric acid (0.5% by weight) according to the weight ratio of 80:20, shape and dry. After calcining at 550° C. in air for 6 hours, the catalyst precursor of the present invention is obtained.

[0040] The prepared catalyst precursor is ion-exchang...

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Abstract

The invention relates to a synthetic method for a composite molecular sieve and an application of the composite molecular sieve in a C6 alkane cracking reaction. The invention is mainly to solve the problems of low catalytic activity and poor stability of a catalyst in the C6 alkane cracking reaction in the prior art. According to the invention, a ZSM-5 / ZSM-12 composite molecular sieve is synthesized to be used as a catalyst; a catalytic reaction is performed under the conditions of using C6 alkane as a raw material and with a reaction temperature in a range of 270 to 550 DEG C and a reactionpressure in a range of 0.01 to 1 MPa; the raw material and a eutectic molecular sieve catalyst generate a contact reaction; and the catalyst used in the reaction comprises the following components inparts by weight: a) 30 to 100 parts of a ZSM-5 / ZSM-12 composite molecular sieve material with a silicon-to-aluminum mol ratio (Si / Al) in a range of 30 to 75, and b) 0 to 70 parts of a binder. With a technical scheme of the invention, the composite molecular sieve prepared by using the synthetic method provided by the invention well solves the above-mentioned problems, and can be applied to industrial production of light alkenes.

Description

technical field [0001] The invention relates to a method for synthesizing a composite molecular sieve and its application in the cracking reaction of carbon hexanes. Background technique [0002] Today's petrochemical industry has developed into one of the key pillar industries that promote the economic development of various countries, and as the core of petrochemical industry and the most important basic raw materials of petrochemical industry - low-carbon olefins: ethylene, propylene, the amount of its output has become a The "barometer" of the country's petrochemical and economic development level. In the petroleum refining industry, operations such as catalytic cracking have been commercialized as the primary route for the synthesis of lower olefins from hydrocarbonaceous feedstocks. [0003] Since the 1960s, molecular sieves have been used as catalytic cracking catalysts. Due to their good thermal stability, high catalytic activity and high selectivity, they have been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C10G11/05
CPCB01J29/40C10G11/05C10G2300/1081C10G2300/70
Inventor 黄政金国杰高焕新杨洪云刘远林汪超丁琳康陈军
Owner CHINA PETROLEUM & CHEM CORP