Coke control reactor, and device and method for preparing low-carbon olefins from oxygen-containing compound

Patent metadata

Field	Value
Publication number	US-11833502-B2
Application number	US-202017784649-A
Country	US
Kind code	B2
Filing date	Oct 16, 2020
Priority date	Oct 16, 2020
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

A coke control reactor, and a device and method for preparing low-carbon olefins from an oxygen-containing compound are provided. The coke control reactor includes a coke control reactor shell, a reaction zone I, and a coke controlled catalyst settling zone; a cross-sectional area at any position of the reaction zone I is less than that of the coke controlled catalyst settling zone; n baffles are arranged in a vertical direction in the reaction zone I; the n baffles divide the reaction zone I into m reaction zone I subzones; and a catalyst circulation hole is formed in each of the baffles, such that a catalyst flows in the reaction zone I in a preset manner. A catalyst charge in the present coke control reactor can be automatically adjusted, and an average residence time of a catalyst in the coke control reactor can be controlled by changing process operating conditions.

First claim

What is claimed is:

1. A coke control reactor, wherein the coke control reactor comprises a coke control reactor shell, a first reaction zone, and a coke controlled catalyst settling zone;
the coke control reactor shell comprises an upper coke control reactor shell and a lower coke control reactor shell; the upper coke control reactor shell encloses the coke controlled catalyst settling zone;
the lower coke control reactor shell encloses the first reaction zone;
the first reaction zone communicates with the coke controlled catalyst settling zone;
a cross-sectional area at any position of the first reaction zone is less than a cross-sectional area at any position of the coke controlled catalyst settling zone;
n baffles are arranged in a vertical direction in the first reaction zone, bottoms of the n baffles are connected to a bottom of the coke control reactor, tops of the n baffles are located in the coke controlled catalyst settling zone, and the n baffles divide the first reaction zone into m subzones of the first reaction zone, wherein m and n are both integers; and
a catalyst circulation hole is formed in each of the n baffles, such that a catalyst flows in the first reaction zone.

2. The coke control reactor according to claim 1 , wherein 1≤n≤9; and 2≤m≤10;
wherein a cross section of the first reaction zone and a cross section of each of the m subzones are all rectangular; the catalyst circulation hole is formed in each of the n baffles; and the catalyst circulation holes on two adjacent baffles are staggered up and down, such that the catalyst flows in the first reaction zone;
wherein the cross section of the first reaction zone is circular; the cross section of each of the m subzones is fan-shaped; and at least one catalyst circulation hole is formed in each of n−1 of the n baffles, such that the catalyst flows in the first reaction zone in an annular manner; or
wherein the cross section of the first reaction zone is annular; the cross section of each of the m subzones is fan-shaped; and at least one catalyst circulation hole is formed in each of n−1 of the n baffles, such that the catalyst flows in the first reaction zone in the annular manner.

3. The coke control reactor according to claim 1 , wherein a cross-sectional area of the coke controlled catalyst settling zone is 1.5 to 3 times a cross-sectional area of the first reaction zone; and
wherein the coke control reactor is a bubbling fluidized bed reactor.

4. The coke control reactor according to claim 1 , wherein the coke control reactor further comprises a transition zone;
the transition zone is located between the first reaction zone and the coke controlled catalyst settling zone;
a cross-sectional area at any position of the transition zone is between the cross-sectional area at any position of the first reaction zone and the cross-sectional area at any position of the coke controlled catalyst settling zone; and
the transition zone, the first reaction zone, and the coke controlled catalyst settling zone communicate with each other coaxially.

5. The coke control reactor according to claim 1 , wherein the first reaction zone comprises a catalyst inlet, a coke controlled catalyst outlet, and a coke control raw material inlet;
the m subzones of the first reaction zone comprise a first subzone, and a second subzone to an m th subzone; the catalyst inlet is formed in the first subzone; the coke controlled catalyst outlet is formed in the m th subzone;
the coke control raw material inlet is formed at a bottom of each of m subzones;
the coke controlled catalyst settling zone comprises a coke control gas outlet; and the coke control gas outlet is formed at a top of the coke controlled catalyst settling zone;
wherein a coke control reactor distributor is provided at the coke control raw material inlet.

6. A device for preparing low-carbon olefins from an oxygen-containing compound, wherein the device comprises a methanol conversion reactor and the coke control reactor according to claim 1 .

7. The device according to claim 6 , wherein the methanol conversion reactor comprises a methanol conversion reactor shell and a delivery pipe;
the methanol conversion reactor shell comprises a lower methanol conversion reactor shell and an upper methanol conversion reactor shell;
the lower methanol conversion reactor shell encloses a second reaction zone;
the delivery pipe is located above the second reaction zone; the delivery pipe has a first end closed and a second end communicating with the second reaction zone;
the upper methanol conversion reactor shell is arranged on a periphery of the delivery pipe;
the upper methanol conversion reactor shell and a pipe wall of the delivery pipe enclose a cavity;
the cavity is divided into a spent catalyst zone and a gas-solid separation zone from bottom to top, respectively; and
the spent catalyst zone is provided with a spent catalyst zone gas distributor;
wherein the gas-solid separation zone is provided with a first gas-solid separation unit of the methanol conversion reactor; an upper part of the delivery pipe is connected to an inlet of the first gas-solid separation unit of the methanol conversion reactor; a spent catalyst outlet of the first gas-solid separation unit of the methanol conversion reactor is formed in the spent catalyst zone; a gas outlet of the first gas-solid separation unit of the methanol conversion reactor communicates with a methanol conversion reactor gas collection chamber; and the methanol conversion reactor gas collection chamber communicates with a product gas delivery pipe;
wherein the gas-solid separation zone is further provided with a second gas-solid separation unit of the methanol conversion reactor; a gas inlet of the second gas-solid separation unit of the methanol conversion reactor is formed in the gas-solid separation zone; a spent catalyst outlet of the second gas-solid separation unit of the methanol conversion reactor is formed in the spent catalyst zone; and a gas outlet of the second gas-solid separation unit of the methanol conversion reactor communicates with the methanol conversion reactor gas collection chamber.

8. The device according to claim 7 , wherein the spent catalyst zone gas distributor is located below the first gas-solid separation unit of the methanol conversion reactor and the second gas-solid separation unit of the methanol conversion reactor.

9. The device according to claim 7 , wherein a spent catalyst circulation pipe and a spent catalyst inclined pipe are further arranged outside the spent catalyst zone;
the spent catalyst circulation pipe is configured to connect the spent catalyst zone and the second reaction zone; and
the spent catalyst inclined pipe is configured to output a spent catalyst.

10. The device according to claim 7 , wherein the second reaction zone communicates with the first reaction zone through a coke controlled catalyst delivery pipe.

11. The device according to claim 9 , wherein the device further comprises a regenerator;
the regenerator is connected to the spent catalyst inclined pipe, such that the spent catalyst is able to be delivered to the regenerator;
the regenerator is connected to a regenerated catalyst delivery pipe, such that a regenerated catalyst is able to be delivered to the coke control reactor; and
an inner bottom of the regenerator is provided with a regenerator distributor;
wherein a bottom of the regenerator is further provided with a regenerator stripper; an upper section of the regenerator stripper is arranged inside the regenerator, and an inlet of the upper section of the regenerator stripper is formed above the regenerator distributor; and a lower section of t

Assignees

• Dalian Inst Chem & Physics Cas

Inventors

• Zhang Tao
• Ye Mao
• Zhang Jinling
• Xu Shuliang
• Tang Hailong
• Wang Xiangao
• Zhang Cheng
• Jia Jinming
• Wang Jing
• Li Hua
• Li Chenggong
• Liu Zhongmin

Classifications

• B01J8/1809 Primary

  Controlling processes · CPC title

• B01J8/005

  Separating solid material from the gas/liquid stream (separation processes per se B01D) · CPC title

• B01J8/1863

  followed by a downward movement outside the reactor and subsequently re-entering it · CPC title

• B01J8/228

  externally, i.e. the particles leaving the vessel and subsequently re-entering it · CPC title

• B01J8/26

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