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A kind of preparation method of xonotlite catalyst

A xonotlite and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, mercaptan preparation, etc., can solve the problems of high price, low yield of methyl mercaptan, and insignificant improvement of catalyst catalytic performance, etc. problems, to achieve the effects of prolonging catalytic life, high methanol conversion rate, improving methanol conversion rate and methyl mercaptan selectivity

Active Publication Date: 2021-01-22
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing catalysts mainly use alkaline additives to modify the acidic catalysts, but the newly generated active centers based on the loading of various additives will sacrifice or cover the original active centers of the catalyst, and even block some pores, resulting in The catalytic performance of the catalyst is not significantly improved, and the service life is short, which cannot effectively solve the problems of low methyl mercaptan yield and high price

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A preparation method of xonotlite catalyst, comprising the following steps:

[0013] (1) According to the molar ratio of raw materials Ca:Si =1:1, Ca(OH) 2 and silica sol were added to deionized water, stirred evenly and prepared 0.1mol L -1 Calcium-silicon mixed suspension;

[0014] (2) According to the molar ratio of raw materials Al:Si =0.01:1, Al(OH) 3 Add it to the calcium-silicon mixed suspension prepared in step (1), stir it evenly, transfer it to the reaction kettle, heat crystallization at 190°C for 8 hours, filter, wash until neutral, and dry at 105°C to constant weight to obtain hard silicon calcium stone catalyst.

[0015] Example of use: The prepared xonotlite catalyst is used in the process of methanol-hydrogen sulfide synthesis of methyl mercaptan (reaction pressure: 1.0MPa, reaction temperature: 370°C, weight hourly space velocity: 1.5h -1 , Nitrogen flow rate: 89mL·min -1 , H 2 S / CH 3 OH molar ratio 2.0:1.0), the measured methanol conversion rate...

Embodiment 2

[0017] A preparation method of xonotlite catalyst, comprising the following steps:

[0018] (1) According to the molar ratio of raw materials Ca:Si =1:1, Ca(OH) 2 and silica sol were added to deionized water, stirred evenly and prepared 1mol L -1 Calcium-silicon mixed suspension;

[0019] (2) According to the molar ratio of raw materials Al:Si =0.1:1, add aluminum isopropoxide into the calcium-silicon mixed suspension prepared in step (1), stir evenly, transfer to the reaction kettle, and hydrothermally crystallize at 220°C After 12 hours, filter, wash to neutral, and dry at 105°C to constant weight to obtain xonotlite catalyst.

[0020] Example of use: The prepared xonotlite catalyst is used in the synthesis of methyl mercaptan from methanol-hydrogen sulfide (reaction pressure: 1.0MPa, reaction temperature: 370°C, weight hourly space velocity: 1.5h -1 , Nitrogen flow rate: 89mL·min -1 , H 2 S / CH 3 OH molar ratio 2.0:1.0), the measured methanol conversion rate is 90.47%,...

Embodiment 3

[0022] A preparation method of xonotlite catalyst, comprising the following steps:

[0023] (1) According to the molar ratio of raw materials Ca:Si =1:1, Ca(OH) 2 and silica sol were added to deionized water, stirred evenly and prepared 1mol L -1 Calcium-silicon mixed suspension;

[0024] (2) According to the molar ratio of raw materials Al:Si =0.01:1, add pseudo-boehmite to the calcium-silicon mixed suspension prepared in step (1), stir evenly, transfer to the reaction kettle, and hydrothermally crystallize at 190°C After 8 hours, filter, wash until neutral, and dry at 105°C to constant weight to obtain xonotlite catalyst.

[0025] Example of use: The prepared xonotlite catalyst is used in the synthesis of methyl mercaptan from methanol-hydrogen sulfide (reaction pressure: 1.0MPa, reaction temperature: 370°C, weight hourly space velocity: 1.5h -1 , Nitrogen flow rate: 89mL·min -1 , H 2 S / CH 3 OH molar ratio 2.0:1.0), the measured methanol conversion rate is 90.69%, the ...

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PUM

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Abstract

The invention discloses a preparation method of an xonotlite catalyst. The preparation method comprises the following steps: adding Ca(OH)2 and silicone sol according to a molar ratio of Ca to Si being 1:1 into deionized water, uniformly stirring, and preparing 0.1 to 1 mol.L<-1> calcium silicon mixed suspension; and according to a molar ratio of Al to Si being (0.01 to 0.1): 1, adding the aluminum source into the prepared calcium silicon mixed suspension, uniformly stirring, transferring to a reaction kettle, hydrothermally crystallizing for 8 to 12 hours at 190 to 220 DEG C, filtering, washing until the solution is neutral, drying at 105 DEG C until a constant weight is obtained, and obtaining the xonotlite catalyst. By adopting the preparation method, the methanol conversion rate and the methanthiol selectivity are improved, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of xonotlite catalyst. Background technique [0002] Methyl mercaptan is an important chemical raw material and organic intermediate, which is widely used in food, feed additives and pesticides and other fields. The synthesis of methyl mercaptan by hydrogen sulfide-methanol is suitable for large-scale industrial production due to the advantages of cheap raw materials, no pollution and high yield of methyl mercaptan. The key to the synthesis of methyl mercaptan by hydrogen sulfide-methanol method lies in the design and development of solid acid-base catalysts. The existing catalysts mainly use basic additives to modify the acidic catalysts, but the newly generated active centers based on the loading of various additives will sacrifice or cover the original active centers of the catalyst, and even block some channels, resulting in The ca...

Claims

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Application Information

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IPC IPC(8): B01J23/02C07C319/08C07C321/04
CPCB01J23/02C07C319/08C07C321/04
Inventor 刘飞曹建新陈莎林倩
Owner GUIZHOU UNIV
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