Continuous purification of an off-gas composed of CO.sub.2 +HCl+COCl.sub.2

U.S. Patent Number: 5391363

Abstract: A continuous process for purifying an off-gas which contains CO.sub.2 and HCl and COCl.sub.2. The process comprises passing the off-gas through a separator filled with N,N-dialkylformamide and HCl. This causes a reaction between the COCl.sub.2 and the N,N-dialkylformamide to give the Vilsmeier complex (adduct of COCl.sub.2 and dialkylformamide) and CO.sub.2. The CO.sub.2 leaving the separator contains small amounts of HCl.

Inventors: Ksoll; Peter (Dossenheim, DE), Reuther; Wolfgang (Heidelberg, DE), Wittmer; Peter (Neustadt, DE)

Assignee: BASF Aktiengesellschaft (Ludwigshafen, DE)

Application Number: 07/943,023

Issued: 1995-02-21

Expired: 2007-02-21

Classes: 423/240R ; 422/168; 423/481

Field of search: 423/24R,481,488 55/71 422/168

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