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Regeneration method of gold-carbon catalyst for preparing VCM

A technology of gold-carbon catalyst and deactivated catalyst is applied in the field of regeneration of gold-carbon catalyst, which can solve the problems of easy deactivation and short life of the catalyst, and achieve the effects of strong operability, stable life and convenient recovery.

Inactive Publication Date: 2021-01-15
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But AuCl 3 The catalyst still has the problem of easy deactivation and short life. The main reasons for deactivation mainly include carbon deposition and sintering. The sintering and agglomeration are due to Au 3+ Species are reduced to Au o Species cause gold particles to aggregate and grow to cause deactivation. Therefore, how to activate and regenerate deactivated gold catalysts efficiently, quickly and safely is one of the challenges in the industrialization of gold catalysts.

Method used

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  • Regeneration method of gold-carbon catalyst for preparing VCM
  • Regeneration method of gold-carbon catalyst for preparing VCM

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A kind of regeneration method that is used to prepare the gold-carbon catalyst of VCM, comprises the following steps:

[0033] (1) One washing: take 100mL of deactivated catalyst, add 300mL of dichloromethane, stir for 2h, filter, repeat the operation 3 times, that is, wash the deactivated catalyst with dichloromethane for 3 times, and then dry at 120°C for 4h;

[0034] (2) Second washing: take the product of step (1), add 300mL of glacial acetic acid, stir for 2h, filter, repeat the operation 3 times, that is, wash the deactivated catalyst with glacial acetic acid for 3 times, and then dry at 120°C for 4h ;

[0035] (3) Roasting: Roasting at 800°C for 5 hours under a nitrogen atmosphere;

[0036] (4) Chemical reaction: Add 300mL of 0.2mol / L sodium citrate solution, stir for 3h, then wash with pure water, and dry at 120°C for 4h;

[0037] (5) Heat treatment: heat treatment at 200°C for 3 hours under nitrogen atmosphere.

Embodiment 2

[0039] A kind of regeneration method that is used to prepare the gold-carbon catalyst of VCM, comprises the following steps:

[0040] (1) One wash: take 100mL of deactivated catalyst, add 300mL of tetrahydrofuran, stir for 2h, filter, repeat the operation 3 times, that is, wash the deactivated catalyst with tetrahydrofuran for 3 times, and then dry at 120°C for 4h;

[0041] (2) Second washing: take the product of step (1), add 300mL of glacial acetic acid, stir for 2h, filter, repeat the operation 3 times, that is, wash the deactivated catalyst with glacial acetic acid for 3 times, and then dry at 120°C for 4h ;

[0042] (3) Roasting: Roasting at 800°C for 5 hours under a nitrogen atmosphere;

[0043] (4) Chemical reaction: Add 300mL of 0.2mol / L sodium citrate solution, stir for 3h, then wash with pure water, and dry at 120°C for 4h;

[0044] (5) Heat treatment: heat treatment at 200°C for 3 hours under nitrogen atmosphere.

Embodiment 3

[0046] A kind of regeneration method that is used to prepare the gold-carbon catalyst of VCM, comprises the following steps:

[0047] (1) One wash: Take 100mL of deactivated catalyst, add 300mL of absolute ethanol, stir for 2h, filter, repeat the operation 3 times, that is, wash the deactivated catalyst with absolute ethanol for 3 times, and then dry at 120°C for 4h;

[0048] (2) Second washing: take the product of step (1), add 300mL of glacial acetic acid, stir for 2h, filter, repeat the operation 3 times, that is, wash the deactivated catalyst with glacial acetic acid for 3 times, and then dry at 120°C for 4h ;

[0049] (3) Roasting: Roasting at 800°C for 5 hours under a nitrogen atmosphere;

[0050] (4) Chemical reaction: Add 300mL of 0.2mol / L sodium citrate solution, stir for 3h, then wash with pure water, and dry at 120°C for 4h;

[0051] (5) Heat treatment: heat treatment at 200°C for 3 hours under nitrogen atmosphere.

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Abstract

The invention discloses a regeneration method of a gold-carbon catalyst for preparing VCM. The method comprises the following steps: (1) primary washing: taking an inactivated catalyst, washing with asolvent A three times, and drying, wherein the solvent A is any one or more of dichloromethane, trichloromethane, acetone, methylbenzene, tetrahydrofuran, N,N-dimethylformamide, absolute ethyl alcohol, ethylene glycol and glacial acetic acid; (2) secondary washing: washing with a solvent B three times, and drying, wherein the solvent B is any one or more of deionized water, ammonia water, glacialacetic acid, concentrated nitric acid and concentrated hydrochloric acid; (3) roasting; (4) chemical reaction: adding a ligand solution, stirring for 2-4 hours, washing with pure water, and drying, wherein the ligand is any one or more of ammonia water, iron thiocyanate, diethylamine tetraacetic acid, sodium citrate, polyvinyl alcohol, polyvinylpyrrolidone and ethylene glycol; and (5) heat treatment.

Description

technical field [0001] The invention belongs to the technical field of noble metal catalysts, and in particular relates to a regeneration method of a gold-carbon catalyst used for preparing VCM. Background technique [0002] At present, the monomer vinyl chloride (VCM) used in the synthesis of polyvinyl chloride (PVC) is mainly produced by acetylene hydrochlorination. Polyvinyl chloride (PVC) resin is one of the five general-purpose plastics in the world, and it has a wide range of uses. According to different sources of raw materials, the industrial production methods of VCM are mainly the following two routes: one is the ethylene oxychlorination method based on petroleum, and VCM is obtained by the reaction of ethylene and chlorine, and the other is the acetylene method based on coal. The reaction of ethylene and hydrogen chloride gives VCM. In view of the actual situation in our country, due to the resource structure of "poor oil, little gas, and rich coal", about 80% o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J23/96B01J38/48B01J38/02B01J38/52B01J38/54B01J38/60B01J38/66C07C17/08C07C21/06
CPCB01J23/52B01J23/96B01J38/48B01J38/02B01J38/52B01J38/54B01J38/60B01J38/66C07C17/08C07C21/06Y02P20/584
Inventor 李小虎李霖金晓东曾利辉万克柔曾永康张之翔
Owner XIAN CATALYST NEW MATERIALS CO LTD
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