Azeotrope of HF and 1233zd

US6013846A · kind A · utility

Assignee

• Elf Atochem North America, Inc. · US

Inventors

• John A. Wismer · Washington Crossing, US
• Michael Sheppard Bolmer · Maple Grove, US
• Bin Chen · Shanghai, CN

Key dates

• Filing date: Mar 5, 1998
• Grant date: Jan 11, 2000
• Expiry date: Mar 5, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C17/383
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An azeotrope containing HF and 1233zd is provided, as are methods for separating this azeotrope from mixtures of HF and 1233zd which are HF-rich or 1233zd-rich and methods for making use of the azeotrope and separation methods to improve processes for preparing 1233zd, an intermediate used in the preparation of 245fa. 245fa is a known foam blowing agent and refrigerant.