Device and method for preparing para-xylene and co-producing light olefins from methanol and/or dimethyl ether and benzene

Patent metadata

Field	Value
Publication number	US-11084765-B2
Application number	US-201716608438-A
Country	US
Kind code	B2
Filing date	Nov 24, 2017
Priority date	Apr 27, 2017
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A fast fluidized bed reactor, device and method for preparing para-xylene and co-producing light olefins from methanol and/or dimethyl ether and benzene, resolving or improving the competition problem between an MTO reaction and an alkylation reaction during the process of producing para-xylene and co-producing light olefins from methanol and/or dimethyl ether and benzene, and achieving a synergistic effect between the MTO reaction and the alkylation reaction. By controlling the mass transfer and reaction, competition between the MTO reaction and the alkylation reaction is coordinated and optimized to facilitate a synergistic effect of the two reactions, so that the conversion rate of benzene, the yield of para-xylene, and the selectivity of light olefins are increased.

First claim

What is claimed is:

1. A fluidized bed reactor for preparing para-xylene and co-producing light olefins from methanol and/or dimethyl ether and benzene, wherein the fluidized bed reactor comprises a reaction zone, a dilute phase zone, a first reactor feed distributor and a plurality of second reactor feed distributors, the first reactor feed distributor and the plurality of second reactor feed distributors are sequentially arranged from bottom to top in the reaction zone; wherein the reaction zone is located in a lower part of the fluidized bed reactor, and the dilute phase zone is located in an upper part of the fluidized bed reactor;
wherein the fluidized bed reactor comprises a first reactor gas-solid separator, the first reactor gas-solid separator is placed in the dilute phase zone or outside a reactor shell, the first reactor gas-solid separator is provided with a regenerated catalyst inlet, a catalyst outlet of the first reactor gas-solid separator is placed at the bottom of a reaction zone, and a gas outlet of the first reactor gas-solid separator is placed in the dilute phase zone.

2. The fluidized bed reactor of claim 1 , wherein the number of the second reactor feed distributors is in a range from 2 to 10.

3. The fluidized bed reactor of claim 1 , wherein the fluidized bed reactor further comprises a second reactor gas-solid separator, the second reactor gas-solid separator is placed in the dilute phase zone or outside the reactor shell;
an inlet of the second reactor gas-solid separator is placed in the dilute phase zone, a catalyst outlet of the second reactor gas-solid separator is placed in the reaction zone, and a gas outlet of the second reactor gas-solid separator is connected to a product gas outlet of the fluidized bed reactor;
the first reactor gas-solid separator and the second reactor gas-solid separator are cyclone separators.

4. The fluidized bed reactor of claim 1 , wherein the fluidized bed reactor comprises a reactor heat extractor, and the reactor heat extractor is arranged inside or outside the reactor shell; and
the reactor heat extractor is arranged between a plurality of reactor feed distributors comprising the first reactor feed distributor and the plurality of second reactor feed distributors.

5. The fluidized bed reactor of claim 1 , wherein the fluidized bed reactor comprises a reactor stripper, the reactor stripper passes through the reactor shell from the outside to the inside at the bottom of the fluidized bed reactor and is opened in the reaction zone of the fluidized bed reactor, and a reactor stripping gas inlet and a spent catalyst outlet are arranged at the bottom of the reactor stripper.

6. A device for preparing para-xylene and co-producing light olefins from methanol and/or dimethyl ether and benzene, wherein the device comprises a fluidized bed reactor comprising a reaction zone, a dilute phase zone, a first reactor feed distributor and a plurality of second reactor feed distributors, the first reactor feed distributor and the plurality of second reactor feed distributors are sequentially arranged from bottom to top in the reaction zone and a fluidized bed regenerator for regenerating a catalyst;
wherein the reaction zone is located in a lower part of the fluidized bed reactor, and the dilute phase zone is located in an upper part of the fluidized bed reactor;
wherein the fluidized bed reactor comprises a first reactor gas-solid separator, the first reactor gas-solid separator is placed in the dilute phase zone or outside a reactor shell, the first reactor gas-solid separator is provided with a regenerated catalyst inlet, a catalyst outlet of the first reactor gas-solid separator is placed at the bottom of a reaction zone, and a gas outlet of the first reactor gas-solid separator is placed in the dilute phase zone.

7. The device of claim 6 , wherein the fluidized bed regenerator is a turbulent fluidized bed regenerator, and the fluidized bed regenerator comprises a regenerator shell, a regenerator gas-solid separator, a regenerator heat extractor and a regenerator stripper; the lower part of the fluidized bed regenerator is a regeneration zone, the upper part of the fluidized bed regenerator is a dilute phase zone of the regenerator, a regenerator feed distributor is placed at the bottom of the regeneration zone, the regenerator heat extractor is placed in the regeneration zone, and the regenerator gas-solid separator is placed in the dilute phase zone or outside the regenerator shell; and
an inlet of the regenerator gas-solid separator is placed in the dilute phase zone of the regenerator, a catalyst outlet of the regenerator gas-solid separator is placed in the regeneration zone, and the regenerator stripper is opened at the bottom of the regenerator shell.

8. The device of claim 6 , wherein the fluidized bed regenerator comprises a regenerator shell, a regenerator feed distributor, a regenerator gas-solid separator, a regenerator heat extractor, a flue gas outlet and a regenerator stripper;
the fluidized bed reactor further comprises a reactor stripper, the reactor stripper passes through the reactor shell from the outside to the inside at the bottom of the fluidized bed reactor and is opened in the reaction zone of the fluidized bed reactor, and a reactor stripping gas inlet and a spent catalyst outlet are arranged at the bottom of the reactor stripper;
a lower part of the fluidized bed regenerator is a regeneration zone, and an upper part of the fluidized bed regenerator is a dilute phase zone;
the regenerator feed distributor is placed at the bottom of the regeneration zone, the regenerator heat extractor is placed in the regeneration zone, the regenerator gas-solid separator is placed in the dilute phase zone or outside the regenerator shell, an inlet of the regenerator gas-solid separator is placed in the dilute phase zone, a catalyst outlet of the regenerator gas-solid separator is placed in the regeneration zone, a gas outlet of the regenerator gas-solid separator is connected to the flue gas outlet, and the regenerator stripper is opened at the bottom of the regenerator shell;
a spent catalyst outlet of the reactor stripper is connected to an inlet of an inclined spent catalyst pipe, a spent catalyst sliding valve is arranged in the inclined spent catalyst pipe, an outlet of the inclined spent catalyst pipe is connected to an inlet of a spent catalyst lift pipe, a bottom of the spent catalyst lift pipe is provided with a spent catalyst lifting gas inlet, and an outlet of the spent catalyst lift pipe is connected to the dilute phase zone of the fluidized bed regenerator; and
a bottom of the regenerator stripper is provided with a regenerator stripping gas inlet, the bottom of the regenerator stripper is connected to an inlet of an inclined regenerated catalyst pipe, a regenerated catalyst sliding valve is arranged in the inclined regenerated catalyst pipe, an outlet of the inclined regenerated catalyst pipe is connected to an inlet of a regenerated catalyst lift pipe, a bottom of the regenerated catalyst lift pipe is provided with a regenerated catalyst lifting gas inlet, an outlet of the regenerated catalyst lift pipe is connected to the regenerated catalyst inlet of the first reactor gas-solid separator.

9. A method for preparing para-xylene and co-producing light olefins from methanol and/or dimethyl ether and benzene, wherein a fluidized bed reactor comprising a reaction zone, a dilute phase zone, a first reactor feed distributor and a plurality of second reactor feed distributors is used in the method, the first reactor feed distributor and the plurality of second reactor feed distributors are sequentially arranged from bottom to top in the reaction zone;
wherein the reaction zo

Assignees

• Dalian Inst Chem & Physics Cas

Inventors

• Ye Mao
• Zhang Tao
• Liu Zhongmin
• Zhang Jinling
• Tang Hailong
• Jia Jinming
• He Changqing
• Wang Xiangao
• Zhang Cheng
• Li Hua
• Zhao Yinfeng
• Li Chenggong

Classifications

• B01J8/24

  according to "fluidised-bed" technique (B01J8/20 takes precedence) · CPC title

• C07C2/865

  the non-hydrocarbon is an ether · CPC title

• C07C2/864 Primary

  the non-hydrocarbon is an alcohol · CPC title

• B01J8/1872

  Details of the fluidised bed reactor (B01J8/1836 takes precedence) · CPC title

• B01J8/26 Primary

  with two or more fluidised beds, e.g. reactor and regeneration installations · CPC title