Azeotropic mixture of hydrogen fluoride and 1,1,1-trifluoro-2-chloroethane

• US 5,401,430 A
• Filed: 10/18/1993
• Issued: 03/28/1995
• Est. Priority Date: 04/15/1991
• Status: Expired due to Term

• Current Assignee: Daikin Industries Ltd, UMEDA CENTER BUILDING
• Original Assignee: Daikin Industries Ltd
• Inventors: Iwashita, Nobuyoshi, Koyama, Satoshi, Komatsu, Satoshi, Tsuda, Takehide
• Primary Examiner(s): THERKORN, LINDA SKALING
• Application Number:
  US08/136,885
• Time in Patent Office: 526 Days
• Field of Search: 252/162, 252/172, 252/DIG. 9, 570/164, 570/177, 570/178, 203/50, 203/67
• US Class Current: 252/67
• CPC Class Codes: C01B 7/196 by distillation
• CPC Class Codes: C07C 17/38 Separation; Purification; Stabilisation; Use of additives
• CPC Class Codes: C07C 19/12 having two carbon atoms

Abstract

Hydrogen fluoride and 1,1,1-trifluoro-2-chloroethane forms an azeotropic mixture of which molar ratio of HF/1,1,1-trifluoro-2-chloroethane varies, for example, from about 60/40 at a pressure of 1.5 Kg/cm² G and a temperature of 20° C. to about 45/55 at a pressure of 15 Kg/cm² G and a temperature of 87°C.

Claims

1. An azeotropic mixture consisting essentially of 1,1,1-trifluoro-2-chloroethane and hydrogen fluoride, wherein the molar ratio of HF/1,1,1-trifluoro-2-chloroethane varies from 65/35 at atmospheric pressure and a temperature of -2°

C., to about 45/55 at a pressure of 15 K/cm² G and a temperature of 87°

C.

2. The azeotropic mixture according to claim 1, wherein the molar ratio of HF/1,1,1-trifluoro-2-chloroethane varies from 65/35 at atmospheric pressure and a temperature of -2°

C., to about 55/45 at a pressure of 4 Kg/cm² G and a temperature of 40°

C.

3. The azeotropic mixture according to claim 1, wherein the molar ratio of HF/1,1,1-trifluoro-2-chloroethane varies from 55/45 at a pressure of 4 Kg/cm² G and a temperature of 40°

C., to about 45/55 at a pressure of 15 Kg/cm² G and a temperature of 87°

C.

4. The azeotropic mixture according to claim 1, wherein the molar ratio of HF/1,1,1-trifluoro-2-chloroethane is about 65/35 at atmospheric pressure and at a temperature of about -2°

C.

5. The azeotropic mixture according to claim 1, wherein the molar ratio of HF/1,1,1-trifluoro-2-chloroethane is about 60/40, at a pressure of about 1.5 Kg/cm² G and a temperature of about 19°

C.

6. The azeotropic mixture according to claim 1, wherein the molar ratio of HF/1,1,1-trifluoro-2-chloroethane is about 55/45, at a pressure of about 4 Kg/cm² G and a temperature of about 40°

C.

7. The azeotropic mixture according to claim 1, wherein the molar ratio of HF/1,1,1-trifluoro-2-chloroethane is about 45/55, at a pressure of about 15 Kg/cm² G and a temperature of about 87°

C.