Reaction-regeneration device and process for alkane dehydrogenation to alkene

Patent metadata

Field	Value
Publication number	US-10343128-B2
Application number	US-201916239643-A
Country	US
Kind code	B2
Filing date	Jan 4, 2019
Priority date	Apr 1, 2017
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A reaction-regeneration device for catalytic dehydrogenation or/and catalytic cracking of alkanes comprises a reaction device and a regeneration device. The reaction device comprises a reactor and a disengager, and the disengager is located at an upper part of the reactor. The reactor comprises a tapering section, and diameters of cross sections of the tapering section gradually decrease from bottom to top. Secondary conversion of alkenes caused by back-mixing is reduced, and thus the yield and selectivity to alkenes are increased.

First claim

The invention claimed is:

1. A catalyst regeneration device, comprising
a regenerator for accommodating a catalyst and a regeneration disengager,
wherein diameters of cross sections of the regenerator are decreased from top to bottom, and
a circular pipe sleeve is arranged at a lower position inside the regenerator.

2. The catalyst regeneration device according to claim 1 , wherein the circular pipe sleeve is parallel to an axis of the regenerator.

3. The catalyst regeneration device according to claim 1 , wherein the circular pipe sleeve is coaxial with the regenerator.

4. The catalyst regeneration device according to claim 1 , wherein a height of the circular pipe sleeve in the regenerator is less than two thirds of a height of a catalyst dense-phase bed layer.

5. The catalyst regeneration device according to claim 1 , wherein a height of the circular pipe sleeve in the regenerator is less than one third of a height of a catalyst dense-phase bed layer.

6. The catalyst regeneration device according to claim 1 , wherein, fuel and air are directly fed into the circular pipe sleeve.

7. A regeneration method for alkane dehydrogenation catalyst, comprising the following step:
spent catalyst entering a regeneration disengager, and fuel and air entering a regenerator from a lower part or bottom of the regenerator;
gas moving upwards in the regenerator, a linear speed of the gas gradually decreasing from bottom to top, and, the spent catalyst moving upwards at a central area and moving downwards at a side wall area in the regenerator so as to form an internal circulation; and
a regenerated catalyst leaving the regenerator through a regenerated catalyst conduit, and the flue resulting from a combustion reaction being discharged from a flue outlet in a top of the regeneration disengager.

8. The regeneration method according to claim 7 , wherein a circular pipe sleeve is arranged in the lower part of the regenerator, and fuel and air enter the circular pipe sleeve from a lower part or bottom of the regenerator.

9. The regeneration method according to claim 8 , wherein a superficial gas velocity inside the circular pipe sleeve is in a range from 1 m/s to 30 m/s.

10. The regeneration method according to claim 7 , wherein a superficial gas velocity inside the circular pipe sleeve is in a range from 3 m/s to 5 m/s.

11. The regeneration method according to claim 7 , wherein a superficial gas velocity of a bottom fuel inlet of a catalyst dense-phase bed layer of the regenerator is in a range from 0.1 m/s to 3 m/s under actual operating conditions.

12. The regeneration method according to claim 7 , wherein a superficial gas velocity of a bottom fuel inlet of a catalyst dense-phase bed layer of the regenerator is in a range from 0.3 m/s to 2 m/s under actual operating conditions.

13. The regeneration method according to claim 7 , wherein a temperature inside the regenerator is 600° C. to 850° C.

14. The regeneration method according to claim 7 , wherein a temperature inside the regenerator is 630° C. to 750° C.

Assignees

• Univ China Petroleum East China

Inventors

• Li Chunyi
• Wang Guowei

Classifications

• C07C4/06

  Catalytic processes {(C07C4/025 takes precedence)} · CPC title

• B01J8/24

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

• B01J8/0065

  by impingement against stationary members · CPC title

• C10G3/00

  Production of liquid hydrocarbon mixtures from oxygen-containing organic materials, e.g. fatty oils, fatty acids (production from non-melting solid oxygen-containing carbonaceous materials C10G1/00) · CPC title

• C07C5/333

  Catalytic processes · CPC title