Phosgene manufacture
AssigneeStauffer Chemical Company
InventorRobert P. Obrecht
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Abstract
Raw material yields are increased and waste disposal requirements are decreased in the preparation of phosgene by the reaction of chlorine with an excess of carbon monoxide in the presence of an activated carbon catalyst by recovering unreacted carbon monoxide and recycling it to the reaction zone.
Claims8
An improved process for preparing phosgene by reacting chlorine with substantially pure carbon monoxide in a reaction zone to produce a product gas mixture comprising phosgene and unreacted carbon monoxide, separating substantially all of said phosgene from said unreacted carbon monoxide by passing the gas mixture through a partial condensation zone and recycling a major portion of said unreacted carbon monoxide directly to said reaction zone whereby the raw material yield of the process is increased and the amount of carbon monoxide discarded as a waste stream is reduced.
A process for preparing phosgene comprising the steps of:
- (a) reacting gaseous chlorine with substantially pure gaseous carbon monoxide in a reaction zone to produce a gaseous product comprising phosgene and unreacted carbon monoxide;
- (b) cooling said gaseous product to condense out substantially all of said phosgene from said gaseous product;
- and
- (c) recycling a major portion of the remainder of said gaseous product to said reaction zone.
Dependencies are inferred from the claim text.