Process and systems for purification of boron trichloride

US6238636A · kind A · utility

Assignees

• Air Liquide America Corporation · US
• American Air Liquide, Inc. · US

Inventors

• Derong Zhou · Doylestown, US
• Gregory M. Jursich · Clarendon Hills, US
• Earle Kebbekus · Princeton, US
• John Borzio · Lawrence, US
• Jason Uner · Chicago, US

Key dates

• Filing date: Sep 3, 1999
• Grant date: May 29, 2001
• Expiry date: Sep 3, 2019

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F17C2270/0518
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Processes are disclosed for increasing the condensed phase production of BCl.sub.3 comprising less than about 10 ppm phosgene, less than 10 ppm chlorine, and less than 10 ppm HCl. In one embodiment the process comprises injecting an inert gas into a container having condensed BCl.sub.3 therein, the condensed BCl.sub.3 having therein a minor portion of phosgene impurity. A major portion of the phosgene in the condensed BCl.sub.3 is decomposed to carbon monoxide and chlorine by increasing temperature to produce a phosgene deficient stream. The temperature of the phosgene deficient stream is then decreased, and contacted with an adsorbent to remove the chlorine in the stream by adsorption to form a chlorine and phosgene free condensed stream. The chlorine and phosgene free stream is stripped using an inert gas to form a BCl.sub.3 product condensed stream, and an inert gas is used to pump the BCl.sub.3 product condensed stream to a product receiver.