Composite catalyst for coal depolymerization and using method therefor

Patent metadata

Field	Value
Publication number	US-11110440-B2
Application number	US-201816052718-A
Country	US
Kind code	B2
Filing date	Aug 2, 2018
Priority date	Feb 3, 2016
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

A composite catalyst for coal depolymerization, the catalyst includes an agent A and an agent B. The agent A includes an iron salt-based catalyst, and the agent B includes a metal salt-based catalyst different from the iron salt-based catalyst. The agent A and the agent B are alternately added during use.

First claim

What is claimed is:

1. A composite catalyst for coal depolymerization, comprising an agent A and an agent B; wherein the agent A comprises an iron salt-containing catalyst; and the agent B comprises a metal salt-containing catalyst different from the iron salt-containing catalyst;
the metal salt-containing catalyst different from the iron salt-containing catalyst is an aluminum salt-containing catalyst; and
the aluminum salt-containing catalyst is aluminum nitrate.

2. The composite catalyst of claim 1 , wherein a weight percentage of the iron salt-containing catalyst is 3% to 25% in the agent A.

3. The composite catalyst of claim 2 , wherein the iron salt-containing catalyst consists of at least one of ferric chloride and ferric nitrate.

4. The composite catalyst of claim 3 , wherein the agent A further consists of at least one of a first inorganic accelerator, a first organic accelerator, a first surfactant and a first solvent.

5. The composite catalyst of claim 4 , wherein the agent A comprises the iron salt-containing catalyst, the first inorganic accelerator, the first organic accelerator, the first surfactant, and the first solvent;
weight percentages of the first inorganic accelerator, the first organic accelerator and the first surfactant are 0.5 to 2%, 1 to 10%, and 0.05 to 2.0% in the agent A, respectively; and a balance is the first solvent.

6. The composite catalyst of claim 5 , wherein the first inorganic accelerator consists of at least one of potassium permanganate, potassium dichromate, potassium peroxydisulfate, and hydrogen peroxide; the first organic accelerator consists of at least one of methanol and ethanol; the first surfactant consists of at least one of fatty alcohol oxyethylene ether, sodium dodecyl benzene sulfonate, alkylphenol polyoxyethylene ether, sodium 1,2-n-butylnaphthalene-6 sulfonate and sodium dioctyl sulfosuccinate; and the first solvent is water.

7. The composite catalyst of claim 1 , wherein
a weight percentage of the metal salt-containing catalyst is 2% to 15% in the agent B.

8. The composite catalyst of claim 7 , wherein the agent B further consists of at least one of a second inorganic accelerator, a second organic accelerator, a second surfactant, and a second solvent.

9. The composite catalyst of claim 8 , wherein the agent B comprises the metal salt-containing catalyst, the second inorganic accelerator, the second organic accelerator, the second surfactant, and the second solvent;
weight percentages of the second inorganic accelerator, the second organic accelerator, and the second surfactant are 0.5 to 2%, 1 to10%, and 0.05 to 2.0% in the agent B, respectively; and
a balance is the second solvent.

10. The composite catalyst of claim 9 , wherein the second inorganic accelerator consists of at least one of potassium permanganate, potassium dichromate, potassium peroxydisulfate and hydrogen peroxide;
the second organic accelerator consists of at least one of methanol and ethanol;
the second surfactant consists of at least one of fatty alcohol oxyethylene ether, sodium dodecyl benzene sulfonate, alkylphenol polyoxyethylene ether, sodium 1,2-n-butylnaphthalene-6 sulfonate and sodium dioctyl sulfosuccinate; and
the second solvent is water.

11. The composite catalyst of claim 1 , wherein a bituminous coal consists of at least one of lignite, long flame coal, non-stick coal, and weakly caking coal.

12. A method of using the composite catalyst for coal pyrolysis of claim 1 , comprising the steps of:
(i) adding the agent A to the bituminous coal, and adding the agent B to the bituminous coal after waiting for a first predetermined time period; or
(ii) adding the agent B to the bituminous coal, and adding the agent A to the bituminous coal after waiting for the first predetermined time time period; or
(iii) repeating the step (i) after waiting for a second predetermined time period on the basis of the step (i) by alternately adding the agent A and the agent B for a plurality of times; or
repeating the step (ii) after waiting for the second predetermined time period on the basis of the step (ii) by alternately adding the agent A and the agent B for a plurality of times.

13. The method of claim 12 , wherein the first predetermined time period or the second predetermined time period is greater than or equal to 30 minutes.

14. The method of claim 12 , wherein the method further comprises the step of: drying the low rank coal with the depolymerization composite catalyst at 110 to 120° C. after waiting for the first predetermined time period or the second predetermined time period.

15. The method of claim 14 , wherein the method further comprises the step of: heating the dried low rank coal in a fixed bed reactor from 300° C. to 630 to 650° C. at a rate of 4 to 5° C./min, and keeping a temperature at 630 to 650° C. for 15 to 20 mins to perform depolymerization.

16. The method of claim 14 , wherein the agent A or the agent B is added into the low rank coal by spraying.

17. The method of claim 14 , wherein adding the agent A or the agent B into the low rank coal is accomplished by immersing the bituminous coal into the agent A or the agent B.

Assignees

• Univ Taiyuan Technology

Inventors

• Huang Wei
• Liang Litong
• Zhang Qian
• Liu Jianwei
• Huai Juntian
• Hao Xiaogang
• Zhang Zhonglin

Classifications

• C10B53/04 Primary

  of powdered coal · CPC title

• B01J27/053

  Sulfates · CPC title

• C10G1/08

  with moving catalysts · CPC title

• B01J23/881

  and iron · CPC title

• B01J23/8873

  Zinc, cadmium or mercury · CPC title