Vapor phase chlorination of 1,1-dichloroethane
AssigneePPG Industries, Inc.
InventorsWalker H. Rideout, Mary E. Jeselnik
Life of this patent
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Abstract
In the preparation of methylchloroform by vapor phase chlorination of 1,1-dichloroethane, the formation of undesirable chlorohydrocarbon reaction products is suppressed by conducting the vapor phase reaction in the presence of a controlled amount of elemental oxygen.
Claims6
In a process for the production of the methylchloroform wherein chlorine and 1,1-dichloroethane are reacted under conditions of temperature and pressure sufficient to maintain the reactants in the vapor phase, the improvement comprising conducting said vapor phase reaction between chlorine and 1,1-dichloroethane in the presence or a controlled quantity of elemental oxygen in amounts of up to about 600 parts per million parts of chlorine and 1,1,-dichloroethane to obtain a reaction product having a higher mole percentage of methylchloroform than that obtained were the reaction conducted in the absence of oxygen uner the same conditions of temperature and pressure, and at the same reactants ratio.
In a process for the production of methylchloroform comprising feeding of vaporous feed mixture of chlorine and 1,1-dichloroethane to a plug flow reactor and reacting vaporous mixture therein at a temperature and pressure sufficient to maintain the reactants in the vapor phase, the improvement comprising adding a controlled amount of oxygen to the reactor feed mixture and maintaining an oxygen concentration in the feed mixture of up to about 600 parts per million parts of feed mixture to obtain a reaction product having a higher mole percentage of methylchloroform than that obtained where the reaction conducted in the absence of oxygen under the same conditions of temperature and pressure and at the same reactants ratio.
Dependencies are inferred from the claim text.