Crystallization column and crystallization method

Patent metadata

Field	Value
Publication number	US-10384148-B2
Application number	US-201515745050-A
Country	US
Kind code	B2
Filing date	Nov 9, 2015
Priority date	Jul 15, 2015
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

A crystallization column and a crystallization method. The crystallization column comprises an upper head ( 1 ), a tower body ( 2 ) and a lower head ( 3 ), wherein a crystallization section ( 11 ) is provided with a tray ( 14 ); and the tray ( 14 ) comprises a tray plate ( 15 ) and a plurality of lower crystallization members ( 17 ). The top end of the lower crystallization member ( 17 ) can form a movable connection with the tray plate ( 15 ), so that the two adjacent lower crystallizing members ( 17 ) are capable of oscillating collisions. The tray ( 14 ) may also comprise a plurality of upper crystallization members ( 21 ) extending upwardly from the upper surface of the tray plate ( 15 ).

First claim

The invention claimed is:

1. A crystallization column, comprising:
an upper head having a gas outlet, a tower body, and a lower head having a gas inlet and a material outlet, wherein the tower body comprises a crystallization section, wherein one or more trays are arranged in the crystallization section, each tray comprises a tray plate extending from the inner wall of the tower body and a plurality of lower crystallization members arranged on the lower surface of the tray plate at intervals with each other.

2. The crystallization column according to claim 1 , wherein the top end of the lower crystallization member and the lower surface of the tray plate are movably connected so that two adjacent lower crystallization members are able to swing and collide.

3. The crystallization column according to claim 2 , wherein a plurality of lifting lugs are arranged on the lower surface of the tray plate at intervals; the top end of the lower crystallization member is provided with a hanger; the hanger is buckled with the lifting lug so that the lower crystallization member is able to swing.

4. The crystallization column according to claim 3 , wherein the plurality of lifting lugs are uniformly disposed on the lower surface of the tray plate, and the plurality of lower crystallization members are connected with the plurality of lifting lugs in one-to-one correspondence.

5. The crystallization column according to claim 4 , wherein the lower crystallization member comprises the hanger and a lower cylinder; and the radial distance between centers of any two adjacent lower cylinders overhanging downward is less than an axial height of the lower cylinder.

6. The crystallization column according to claim 5 , wherein a cylinder surface of the lower cylinder is provided with a projection.

7. The crystallization column according to claim 6 , wherein the projection is a spiny object, and a plurality of spiny objects radially extend outward from the cylinder surface of the lower cylinder so that the lower cylinder forms a mace structure.

8. The crystallization column according to claim 7 , wherein the maximum radial length of the spiny object is 1/20 to ⅛ of the axial height of the lower cylinder.

9. The crystallization column according to claim 7 , wherein, in the lower cylinder of the mace structure, the height clearance between the upper and lower adjacent spiny objects is 1/20 to ⅛ of the axial height of the lower cylinder.

10. The crystallization column according to claim 2 , wherein the top end of the lower crystallization member is connected to the lower surface of the tray plate through a flexible rope.

11. The crystallization column according to claim 1 , wherein the lower crystallization member is an elastic or flexible member with a top end fixedly connected to the lower surface of the tray plate, and the elastic or flexible member is bendable so that two adjacent lower crystallization members are able to swing and collide.

12. The crystallization column according to claim 1 , wherein the lower crystallization member comprises a lower cylinder and a flexible thread, and the lower cylinder equipped with the flexible thread forms a torsion wire brush type structure.

13. The crystallization column according to claim 1 , wherein a first end of the tray plate is connected with the inner wall of the tower body, and the second end of the tray plate extends crosswise and a gap exists between the second end and the inner wall of the opposite side of the tower body.

14. The crystallization column of the claim 13 , wherein a plurality of trays are disposed on two sides of the central axis of the tower body in a vertical direction to form a left and right staggering arrangement.

15. The crystallization column according to claim 14 , wherein each tray further comprises a plurality of upper crystallization members that extend upward from the upper surface of the tray plate.

16. The crystallization column according to claim 15 , wherein, in an upper tray and a lower try adjacent to each other in the vertical direction, a clearance between the top end of the upper crystallization member of the lower tray and the bottom end of the lower crystallization member of the upper tray is 20 mm to 150 mm.

17. The crystallization column according to claim 15 , wherein the upper crystallization member comprises an upper cylinder and a flexible thread, and the upper cylinder is equipped with the flexible thread to form a torsion wire brush type structure.

18. The crystallization column according to claim 17 , wherein the upper cylinder is made of stainless steel, tetrafluorohydrazine, or carbon steel coated with tetrafluorohydrazine, wherein the flexible thread is made of carbon fiber, nylon, fluoroplastics, or stainless steel wire.

19. The crystallization column according to claim 17 , wherein a diameter of the flexible thread is 1 mm to 12 mm, wherein, when the flexible thread is of metal material, the diameter of the flexible thread is 1 mm to 3 mm; and when the flexible thread is of non-metal material, the diameter of the flexible thread is 2 mm to 5 mm.

20. The crystallization column according to claim 1 , wherein the tower body further comprises a cooling section having a heat removing component, and wherein; the heat removing component is one selected from the group consisting of a shell and tube type evaporative cooler, a plate type heat exchanger, an electrical refrigeration unit, and a gas type lithium bromide unit.

21. The crystallization column according to claim 20 , wherein the tower body further comprises a feed mixing section located below the cooling section, wherein the feed mixing section has a gas phase distributor, and wherein the gas phase distributor is an aerator, a plate type gas phase distributor, or a trough-pan gas phase distributor.

22. The crystallization column according to claim 1 , wherein the upper head further comprises a water inlet, wherein the water inlet is connected with a water distribution pipe, and wherein the water distribution pipe has a plurality of nozzles.

23. The crystallization column according to claim 22 , wherein the water inlet serves is the gas outlet, or the water inlet and the gas outlet are separately disposed.

24. A crystallization method using the crystallization column of claim 1 , wherein a feedstock gas enters flail the tower body through the gas inlet, reacts to crystallize on one or more of the plurality of trays in the crystallization section, and is discharged from the gas outlet.

25. The crystallization method according to claim 24 , wherein the feedstock gas is a mixture of hydrogen sulfide-containing gas and ammonia gas.

26. The crystallization method according to claim 25 , wherein a molar ratio of the hydrogen sulfide-containing gas and the ammonia gas is 1:1 to 1:2 in the feedstock gas.

27. The crystallization method according to claim 25 , wherein a crystallization temperature of the feedstock is 0° C.-40° C.

28. The crystallization method according to claim 24 , wherein the crystallization method further comprises: adding water from the top of the tower body to flush crystals on the plurality of trays, and discharge a mixture of the water after flushing and the crystals from the material outlet.

Assignees

• China Petroleum & Chem Corp
• Fushun Res Institute Of Petroleum And Petrochemicals Sinopec Corp

Inventors

• Peng Deqiang
• Qi Huimin
• Wang Luyao
• Chen Xin
• Meng Fanfei
• Wang Yan
• Liu Jie

Classifications

• B01D53/002

  by condensation · CPC title

• B01D9/005

  Selection of auxiliary, e.g. for control of crystallisation nuclei, of crystal growth, of adherence to walls; Arrangements for introduction thereof · CPC title

• B01D2009/0086

  Processes or apparatus therefor · CPC title

• C01C1/20

  Sulfides; Polysulfides · CPC title

• B01D9/0013 Primary

  by indirect heat exchange · CPC title