Catalyst for preparing chloroethylene by cracking 1,2-dichloroethane and a preparation and regeneration method thereof

Patent metadata

Field	Value
Publication number	US-11338276-B2
Application number	US-201916643617-A
Country	US
Kind code	B2
Filing date	Apr 30, 2019
Priority date	Apr 30, 2019
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

A catalyst for preparing chloroethylene by cracking 1,2-dichloroethane and a preparation and regeneration method thereof are disclosed in the present application. A catalyst for preparing chloroethylene by cracking 1,2-dichloroethane includes a carrier and a nitrogen-containing carbon as an active component of the catalyst with the nitrogen-containing carbon being loaded on the carrier. The method for preparing the catalyst includes: supporting an organic matter on an inorganic porous carrier and then performing a carbonization-nitridation process by pyrolysis in an atmosphere containing the nitrogen-containing compound. The method for regenerating the catalyst includes: calcinating the catalyst with deactivated carbon deposit in an oxidizing atmosphere to remove all the carbonaceous portions on the surface, and repeating the above preparation process of the catalyst. The catalyst reduces reaction temperature, reduces energy consumption, reduces production cost, and improves selectivity and conversion rate and is inexpensive and reproducible, and has a long service life.

First claim

What is claimed is:

1. A regeneration method of the catalyst for preparing chloroethylene by cracking 1,2-dichloroethane comprising a carrier and a nitrogen-containing carbon material as an active component of the catalyst; and the nitrogen-containing carbon material is loaded on the carrier; the carrier is at least one selected from inorganic porous materials; in the nitrogen-containing carbon material, a nitrogen element is doped in the carbon material in a form of covalent bond, the regeneration method comprising:
calcinating a deactivated catalyst in an atmosphere containing oxygen after deactivating the catalyst in a catalytic cracking reaction of 1,2-dichloroethane for preparing chloroethylene; using the solid obtained after calcination as a carrier to prepare a regenerated catalyst according to a preparation method in supporting an organic precursor on the inorganic porous material of the solid as the carrier and then carrying out a carbonization-nitridation reaction by pyrolysis in an atmosphere containing a nitrogen-containing compound;
wherein the inorganic porous material is at least one selected from the group consisting of silicon oxide, aluminum oxide, titanium oxide, and zirconium oxide.

2. The regeneration method according to claim 1 , wherein the calcination conditions are: a calcination temperature in a range from 300° C. to 800° C., and a calcination time in a range from 0.2 hour to 10 hours.

3. The regeneration method according to claim 1 , wherein the calcination conditions are: a calcination temperature in a range from 450° C. to 700° C. and a calcination time in a range from 0.5 hour to 6 hours.

4. The regeneration method according to claim 1 , wherein the mass percentage of the nitrogen element in the nitrogen-containing carbon material is in a range from 0.1% to 20%.

5. The regeneration method according to claim 1 , wherein the mass percentage of the nitrogen element in the nitrogen-containing carbon material is in a range from 1% to 9%.

6. The regeneration method according to claim 1 , wherein the mass percentage of the nitrogen-containing carbon material in the catalyst is in a range from 1% to 40%.

7. The regeneration method according to claim 1 , wherein the mass percentage of the nitrogen-containing carbon material in the catalyst is in a range from 8% to 30%.

8. The regeneration method according to claim 1 , wherein the pyrolysis conditions are: a pyrolysis temperature in a range from 400° C. to 1000° C., and a pyrolysis time in a range from 0.2 hour to 10 hours.

9. The regeneration method according to claim 1 , wherein the pyrolysis conditions are: a pyrolysis temperature in a range from 600° C. to 900° C., and a pyrolysis time in a range from 0.5 hour to 6 hours.

10. The regeneration method according to claim 1 , wherein the nitrogen-containing compound is at least one selected from the group consisting of ammonia gas, hydrazine, an organic compound containing a C—N bond, an organic compound containing C═N, and an organic compound containing C≡N.

11. The regeneration method according to claim 1 , wherein the nitrogen-containing compound is at least one selected from the group consisting of ammonia gas, hydrazine, acetonitrile, cyanamide, pyridine, pyrrole, ethylenediamine or methylamine.

12. The regeneration method according to claim 1 , wherein the organic precursor is at least one selected from the group consisting of hydrocarbon compound, polymer, an organic compound containing at least one group of *—CX, *—OH, *—C≡N, *—C≡N, *—C—O—* bond, *—C—NH 2 , *—C—NH—C—*, *—C—N—C—*;
wherein X in *—CX represents a halogen, which is at least one selected from the group consisting of F, Cl, Br, and I.

13. The regeneration method according to claim 1 , wherein the organic precursor is at least one selected from the group consisting of acrylonitrile, chloroethylene, dichloroethylene, vinylpyridine, acrylamide, acrylic compounds, vinyl ester compounds, aniline compounds, pyrrolic compounds, urea resin, phenol resin, melamine resin, polyurethane and furan resin in a form of a monomer or polymer, glucose, fructose, xylose, sucrose, dextran, lignin, organic pyrolysis oil and pitch.

14. The regeneration method according to claim 1 , wherein the method for supporting the organic precursor on the inorganic porous material is at least one selected from the following methods:
(i) an impregnation method;
(ii) a spraying method.

Assignees

• Dalian Inst Chem & Physics Cas
• Formosa Plastics Corp

Inventors

• Xu Jinming
• Fan Sisi
• Huang Yanqiang
• Zhang Fao
• Huang Chin Lien
• Hung Wan Tun
• Chen Tu Cheng
• Wu Chien Hui
• Cheng Ya Wen
• Wen Ming Hsien
• Chang Chao Chin
• Huang Tsao Cheng

Classifications

• Y02P20/584

  Recycling of catalysts · CPC title

• B01J27/24 Primary

  Nitrogen compounds · CPC title

• B01J21/06

  Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof · CPC title

• C07C21/06

  Vinyl chloride · CPC title

• C07C17/25

  by splitting-off hydrogen halides from halogenated hydrocarbons · CPC title