Process for drying a gas stream comprising 2,3,3,3 tetrafluoropropene

Patent metadata

Field	Value
Publication number	US-10130909-B2
Application number	US-30832707-A
Country	US
Kind code	B2
Filing date	Jun 14, 2007
Priority date	Jun 14, 2006
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

A method of drying a fluid comprising a fluoropropene, which method comprises the step of contacting the fluid with a desiccant comprising molecular sieve having openings which have a size across their largest dimension of from about 3 Å to about 5 Å. A heat transfer device comprising a heat transfer fluid comprising a fluoropropene, and a desiccant comprising a molecular sieve having openings which have a size across their largest dimension of from about 3 Å to about 5 Å. Preferably, the fluoropropene is R134yf or R-1225ye.

First claim

The invention claimed is:

1. A method of drying a fluid comprising R-1234yf and water, the method comprises the step of:
contacting the fluid with a desiccant comprising a molecular sieve having openings which have a size across their largest dimension of from 3 Å to 4 Å, and
separating water from the R-1234yf when contacting the fluid with said desiccant.

2. The method according to claim 1 , wherein the molecular sieve has openings which have a size across their largest dimension of 4 Å.

3. The method according to claim 1 wherein the fluid comprises at least one additional refrigerant component.

4. The method according to claim 3 wherein the at least one additional refrigerant component is selected from CF 3 I, R-134a and R152a.

5. The method according to claim 1 wherein the fluid further comprises a lubricant.

6. The method according to claim 5 wherein the lubricant is selected from esters, PAGs, PVEs, mineral oils and synthetic hydrocarbons.

7. The method according claim 1 wherein the fluid further comprises a stabiliser.

8. The method according to claim 7 wherein the stabiliser is selected from epoxides, dienes and phenols.

9. The method according claim 1 wherein the fluid further comprises a dye.

10. The method according to claim 9 wherein the dye is a fluorescene.

11. The method according claim 1 wherein the desiccant comprises at least one further desiccant or adsorbent other than the molecular sieve.

12. The method according to claim 11 wherein the at least one further desiccant or adsorbent is selected from alumina, silica and activated carbon.

13. The method according to claim 12 wherein the desiccant is contained in a cartridge.

14. The method according claim 1 wherein the desiccant does not contain any further desiccant other than the molecular sieve.

15. The method according claim 1 wherein the fluid is a heat transfer fluid.

16. The method of claim 1 wherein the fluid, prior to the contacting step, comprises at least 1 mg water/g fluid.

17. A method of providing cooling, the method comprising:
providing a heat transfer fluid comprising R-1234yf and water;
drying the fluid by contacting the heat transfer fluid with a desiccant, said desiccant comprising a molecular sieve having openings which have a size across their largest dimension of from 3 Å to 4 Å;
separating water from the R-1234yf when contacting the fluid with said desiccant; and
using the fluid to provide cooling.

18. The method according to claim 17 wherein the method of providing cooling is performed in a mobile air conditioning system.

19. The method according to claim 18 wherein the mobile air conditioning system is an automotive air conditioning system.

20. A heat transfer device comprising:
a heat transfer fluid comprising a R-1234yf and water;
and a desiccant comprising a molecular sieve having openings which have a size across their largest dimension of from 3 Å to 4 Å, wherein said desiccant separate water from the R-1234yf.

21. The heat transfer device according to claim 20 wherein the heat transfer device is a refrigeration system.

22. The heat transfer device according to claim 21 wherein the heat transfer device is an automotive air conditioning system.

Assignees

• Low Robert E
• Corr Stuart
• Mexichem Amanco Holding Sa

Inventors

• Low Robert E
• Corr Stuart

Classifications

• C07C17/389 Primary

  by adsorption on solids · CPC title

• B01D53/261 Primary

  by adsorption · CPC title

• C07C21/18

  containing fluorine · CPC title

• B01D2253/108

  Zeolites · CPC title

• F25B43/003

  Filters · CPC title