Isobutane dehydrogenation catalyst and preparation method thereof and method for preparing isobutene from isobutane dehydrogenation

A dehydrogenation catalyst, isobutane technology, applied in catalyst activation/preparation, catalyst, molecular sieve catalyst and other directions, can solve the problems of uneven dispersion of precious metal active components, poor catalytic activity and stability, complex preparation process, etc. The effect of carbon deposition risk, high membrane surface flow rate, and simple preparation process

Active Publication Date: 2021-10-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the complex preparation process of the existing isobutane dehydrogenation catalytic catalyst, the preparation process is easy to cause environmental pollution, the uneven dispersion of the noble metal active components of the isobutane dehydrogenation catalyst, catalytic activity and stability Poor defect, provide a kind of method for preparing isobutane dehydrogenation catalyst and the method for isobutane dehydrogenation catalyst prepared by this method and isobutane dehydrogenation isobutene, the method provided by the present invention is easy to operate, environment-friendly And the cost is low, and the isobutane dehydrogenation catalyst prepared by this method can achieve better dehydrogenation activity, selectivity, stability and carbon deposition resistance under the condition that the precious metal loading is very low

Method used

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  • Isobutane dehydrogenation catalyst and preparation method thereof and method for preparing isobutene from isobutane dehydrogenation
  • Isobutane dehydrogenation catalyst and preparation method thereof and method for preparing isobutene from isobutane dehydrogenation
  • Isobutane dehydrogenation catalyst and preparation method thereof and method for preparing isobutene from isobutane dehydrogenation

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preparation example Construction

[0048] According to the present invention, in step (b), the preparation method of the silica gel preferably comprises: contacting water glass, inorganic acid solution, n-butanol and glycerol.

[0049] Preferably, the conditions for contacting the water glass with the inorganic acid include: the temperature can be 10-60°C, preferably 20-40°C; the time can be 1-5h, preferably 1.5-3h, and the pH value is 2-4 . In order to increase the pore size of the prepared silica gel, preferably, the weight ratio of the amount of water glass, inorganic acid solution, n-butanol and glycerol is 3-6:1:0.8-2.5:0.8-2.5, more preferably Preferably, the water glass, inorganic acid solution, n-butanol and glycerol are used in a weight ratio of 3-6:1:1:1. In order to be more conducive to the uniform mixing between the various substances, the contact of the water glass, the inorganic acid solution, n-butanol and glycerol is preferably carried out under stirring conditions.

[0050] According to the p...

Embodiment 1

[0084] This example is used to illustrate the isobutane dehydrogenation catalyst and its preparation method.

[0085] (1) Preparation of spherical double mesoporous composite support

[0086] Dissolve 6g (0.001mol) of triblock copolymer surfactant P123 in 10ml of hydrochloric acid aqueous solution with a pH value of 4 and 220ml of deionized aqueous solution, stir for 4h until P123 dissolves to form a transparent solution, and then add it to the transparent solution Add 6g (0.08mol) of n-butanol and stir for 1h, then place it in a water bath at 40°C, slowly add 12.9g (0.062mol) of tetraethyl orthosilicate into the solution, and keep the temperature at about 40°C. Stirring for 24 hours at a pH value of 4.5, and then hydrothermally treating at 100°C for 24 hours, and then obtaining mesoporous molecular sieve material A1 with three-dimensional cubic channels;

[0087] Water glass with a concentration of 15% by weight, sulfuric acid solution with a concentration of 12% by weight, ...

Embodiment 2

[0109] This example is used to illustrate the isobutane dehydrogenation catalyst and its preparation method.

[0110] (1) Preparation of spherical double mesoporous composite carrier

[0111] Dissolve 6g (0.001mol) of triblock copolymer surfactant P123 in 10ml of hydrochloric acid aqueous solution with a pH value of 4 and 220ml of deionized aqueous solution, stir for 4h until P123 dissolves to form a transparent solution, and then add it to the transparent solution Add 6.7g (0.09mol) n-butanol and stir for 1h, then place it in a water bath at 40°C, slowly add 10.4g (0.05mol) ethyl tetrasilicate to the solution dropwise, and keep the temperature at about 40°C Stirring for 24 hours at a pH value of 5, and then hydrothermally treating at 90°C for 36 hours, and then obtaining mesoporous molecular sieve material A2 with three-dimensional cubic channels;

[0112] Water glass with a concentration of 15% by weight, sulfuric acid solution with a concentration of 12% by weight, n-butan...

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Abstract

The invention relates to the field of catalysts, and discloses an isobutane dehydrogenation catalyst, a preparation method thereof and a method for preparing isobutene from isobutane dehydrogenation. The method for preparing an isobutane dehydrogenation catalyst includes: (a) preparing a mesoporous molecular sieve material; (b) mixing the aforementioned mesoporous molecular sieve material with silica gel, and then filtering and washing the mixed material, ball milling, slurrying and spraying in sequence Drying to obtain a spherical double mesoporous composite material carrier; (c) impregnating the aforementioned spherical double mesoporous composite material carrier in a solution containing a Pt component precursor and a Zn component precursor, followed by solvent removal and Drying, wherein, the filtering and washing described in step (b) is carried out in a ceramic membrane filter, the content of sodium ions in the mixed material after filtering and washing is not higher than 0.2% by weight in terms of sodium element, and the content of template agent is not higher than 1% by weight. The obtained isobutane dehydrogenation catalyst has good dehydrogenation activity and carbon deposition resistance.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a method for preparing an isobutane dehydrogenation catalyst, an isobutane dehydrogenation catalyst prepared by the method and a method for preparing isobutene from isobutane dehydrogenation. Background technique [0002] Isobutylene is a very important organic chemical raw material, mainly used in the preparation of methyl tert-butyl ether, butyl rubber, methyl ethyl ketone, polyisobutylene, methyl methacrylate, isoprene, tert-butylphenol, tert-butylamine, 1, Various organic raw materials and fine chemicals such as 4-butanediol and ABS resin. The main source of isobutene is the by-product C4 fraction of naphtha steam cracking ethylene unit, the by-product C4 fraction of refinery fluid catalytic cracking (FCC) unit and the by-product tert-butanol (TAB ). [0003] In recent years, with the development and utilization of isobutene downstream products, the demand for isobutene has been in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/03B01J35/02B01J35/08B01J35/10B01J37/02B01J37/00C07C5/333C07C11/09
CPCB01J29/0325B01J35/0066B01J35/023B01J35/08B01J35/1019B01J35/1047B01J35/1061B01J37/009B01J37/0201B01J2229/20C07C5/3337C07C2529/03C07C11/09
Inventor 亢宇刘红梅刘东兵
Owner CHINA PETROLEUM & CHEM CORP
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