Catalytic cracking process and catalyst system therefor

Patent metadata

Field	Value
Publication number	US-11639474-B2
Application number	US-201917288288-A
Country	US
Kind code	B2
Filing date	Oct 25, 2019
Priority date	Oct 26, 2018
Publication date	May 2, 2023
Grant date	May 2, 2023

Abstract

A catalytic cracking process includes a step of contacting a cracking feedstock with a catalytic cracking catalyst in the presence of a radical initiator for reaction under catalytic cracking conditions. The radical initiator contains a dendritic polymer and/or a hyperbranched polymer. The dendritic polymer and the hyperbranched polymer each independently has a degree of branching of about 0.3-1, and each independently has a weight average molecular weight of greater than about 1000. The catalytic cracking process is beneficial to enhancing and accelerating the free radical cracking of petroleum hydrocarbon and promoting the regulation of cracking activity and product distribution; by using the process disclosed herein, the conversion of catalytic cracking can be improved, the yields of ethylene and propylene can be increased, and the yield of coke can be reduced.

First claim

The invention claimed is:

1. A catalytic cracking process for producing light olefins, comprising a step of contacting a cracking feedstock with a catalytic cracking catalyst in the presence of a radical initiator for reaction under catalytic cracking conditions to obtain a product comprising light olefins, wherein the radical initiator comprises a dendritic polymer, a hyperbranched polymer or a combination thereof, the catalytic cracking catalyst comprises a Y zeolite, a shape selective zeolite, or a combination thereof, and the cracking feedstock is selected from the group consisting of hydrocarbons having 4-14 carbon atoms, naphtha, light cycle oil, vacuum gas oil, vacuum residuum, and combinations thereof.

2. The process according to claim 1 , wherein the dendritic polymer and the hyperbranched polymer are each independently selected from the group consisting of polyolefins, polyetheresters, polyethers, polyurethanes, polyamides, polysilanes, and combinations thereof.

3. The process according to claim 1 , wherein the radical initiator comprises a polymer selected from the group consisting of hyperbranched polyglycidyl ethers, terminal group-modified hyperbranched polyglycidyl ethers, dendritic polyamide-amines, hyperbranched polyamide-amines, and combinations thereof.

4. The process according to claim 1 , wherein the radical initiator comprises a terminal group-modified hyperbranched polyglycidyl ether, the terminal group of which being selected from the group consisting of ester groups having 2-10 carbon atoms, amine group, mercapto group, and combinations thereof.

5. The process according to claim 1 , wherein the dendritic polymer and the hyperbranched polymer each independently has a degree of branching of 0.3-1.

6. The process according to claim 1 , wherein the dendritic polymer and the hyperbranched polymer each independently has a weight average molecular weight of from 2000 to 30000.

7. The process according to claim 1 , wherein the radical initiator comprises a palmitate-terminated hyperbranched polyglycidyl ether (PHPG) having a weight average molecular weight of 1000-30000 and a degree of branching of 0.3-1.

8. The process according to claim 7 , wherein the palmitate-terminated hyperbranched polyglycidyl ether (PHPG) has a structure represented by formula (I):

9. The process according to claim 1 , wherein the shape selective zeolite is selected from the group consisting of ZSM-5 zeolite, β zeolite, and combinations thereof.

10. The process according to claim 1 , wherein the ratio of the total weight of dendritic polymer and hyperbranched polymer contained in the radical initiator to the weight of the cracking feedstock is 0.00001:1 to 0.01:1.

11. The process according to claim 1 , wherein the catalytic cracking conditions include:
a reaction temperature of 450-700° C.;
a weight hourly space velocity of 1-50 h −1 ; and
a catalyst-to-oil ratio of 1:1 to 20:1.

12. The process according to claim 1 , wherein the radical initiator comprises a palmitate-terminated hyperbranched polyglycidyl ether (PHPG) having a weight average molecular weight of 2000-20000, and a degree of branching of 0.3-0.9.

Assignees

• China Petroleum & Chem Corp
• Sinopec Res Inst Petroleum

Inventors

• Luo Yibin
• Ouyang Ying
• Xing Enhui
• Shu Xingtian
• Cheng Xiaojie
• Zhu Genquan

Classifications

• C07C2529/70

  of types characterised by their specific structure not provided for in groups C07C2529/08 - C07C2529/65 · CPC title

• C08G83/002

  Dendritic macromolecules · CPC title

• C10G2400/02

  Gasoline · CPC title

• B01J29/7007

  Zeolite Beta · CPC title

• C07C11/08

  with four carbon atoms · CPC title