Process for drying HCFO-1233zd

Patent metadata

Field	Value
Publication number	US-9540296-B2
Application number	US-201615046591-A
Country	US
Kind code	B2
Filing date	Feb 18, 2016
Priority date	Mar 19, 2015
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

Disclosed is a process to dry 1-chloro-3,3,3-trifluoropropene (HCFO-1233zd) or its mixtures by washing with water and or alkaline solution. The resulting liquid mixture, containing HCFO-1233zd, other organic, and water, is allowed to settle, and thereafter, the lighter water layer is decanted off from the top of the mixture. The heavier HCFO-1233zd layer is then withdrawn from the bottom of the decanter to a desiccant dryer (e.g., molecular sieve, activated alumina, silica gel, and the like) to further remove the residual soluble moisture from the HCFO-1233zd to about 80 ppm or less.

First claim

What is claimed is:

1. In the process of purifying crude 1-chloro-3,3,3-trifluoropropene (HCFO-1233zd), wherein the crude HCFO-1233zd product requires aqueous washing to remove HF, HC1, and other acidic components,
the improvement comprising conducting each of the following steps in order:
(a) washing the crude HCFO-1233zd with water to form a washed mixture;
(b) condensing the washed mixture; and
(c) separating the washed mixture into a lighter water layer and heavier HCFO-1233zd layer, followed by drying the HCFO-1233zd layer with a desiccant, thereby producing an HCFO-1233zd product with a moisture level of 80 ppm or less.

2. The process of claim 1 , wherein the moisture level is about 50 ppm or less.

3. The process of claim 1 , wherein the moisture level is about 20 ppm or less.

4. The process of claim 1 , wherein the moisture level is about 10 ppm or less.

5. The process of claim 1 , wherein the crude HFC-1233zd is washed with an alkaline solution.

6. The process of claim 1 , wherein the desiccant is selected from the group consisting of molecular sieve 3A, 4A, activated alumina, silica gel, CaSO 4 , and mixtures thereof.

7. The process of claim 6 , wherein the desiccant comprises molecular sieve 3A.

8. The process of claim 6 , wherein the desiccant is comprises molecular sieve 4A.

9. The process of claim 6 , wherein the desiccant comprises activated alumina.

10. The process of claim 6 , wherein the desiccant comprises silica gel.

11. The process of claim 6 , wherein the desiccant comprises CaSO 4 .

Assignees

• Honeywell Int Inc

Inventors

• Chiu Yuon
• Cottrell Stephen A

Classifications

• C07C17/389 Primary

  by adsorption on solids · CPC title

• C07C17/38

  Separation; Purification; Stabilisation; Use of additives · CPC title