E.i. Dupont De Nemours and Company

Michael Keane, Jr

David A Glasscock

Paul S Furmanek

David Richard Corbin

Barry Asher Mahler

V N Mallikarjuna Rao

George C Sonnichsen

Robert D Shannon

Thurman E Gier

A process for producing difluoromethane is disclosed which includes the step of contacting a gaseous mixture containing CH,Cl,and hydrogen fluoride with a catalyst containing a catalytically effective amount of trivalent chromium supported on a carbon having an ash content of less than 0.5 percent by weight, at a temperature of from about 180 &deg; C. to about 375&deg; C. The catalyst and temperature conditions of this process allow the concurrent reaction CCl,CF,with HF to form CCl,FCF,. CH,ClF and unreacted CH,Cl,, each of which may be recovered as an azeotrope with HF, may be recycled.

Production of dihalomethanes containing fluorine and azeotropes of dihalomethanes containing chlorine with HF

A process for producing difluoromethane is disclosed which includes the step of contacting a gaseous mixture containing CH.sub.2 Cl.sub.2 and hydrogen fluoride with a catalyst containing a catalytically effective amount of trivalent chromium supported on a carbon having an ash content of less than 0.5 percent by weight, at a temperature of from about 180.degree. C. to about 375.degree. C. The catalyst and temperature conditions of this process allow the concurrent reaction CCl.sub.3 CF.sub.3 with HF to form CCl.sub.2 FCF.sub.3. CH.sub.2 ClF and unreacted CH.sub.2 Cl.sub.2, each of which may be recovered as an azeotrope with HF, may be recycled.

Production of dihalomethanes containing fluorine and azeotropes of

A process is provided for producing dimethylamine, comprising reacting methanol and/or dimethylether and ammonia, in amounts sufficient to provide a carbon/nitrogen (C/N) ratio of from about 0.2 to about 1.5, at a temperature from about 250.degree. C. to about 450.degree. C., in the presence of a catalytic amount of an acidic zeolite rho.

Zeolite Rho as catalyst for conversion of methanol and ammonia to

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Wilmington, DE, United States of America

Michael Keane, Jr