Systems for purification of boron trichloride

US6361750B1 · kind B1 · 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: Nov 29, 2000
• Grant date: Mar 26, 2002
• Expiry date: Nov 29, 2020

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 BCl3 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 BCl3 therein, the condensed BCl3 having therein a minor portion of phosgene impurity. A major portion of the phosgene in the condensed BCl3 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 BCl3 product condensed stream, and an inert gas is used to pump the BCl3 product condensed stream to a product receiver.