The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 1999
Filed:
Jun. 23, 1997
Applicant:
Inventors:
Peter Roth, Eppstein, DE;
Erhard Leistner, Braunfels, DE;
Hans Haverkamp, Eppstein, DE;
Wolfgang Wendel, Kelkheim, DE;
Michael Kleiber, Frankfurt, DE;
Assignee:
Hoechst Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; C07C / ; C07C / ;
U.S. Cl.
CPC ...
203 14 ; 203 23 ; 203 51 ; 203 59 ; 203 60 ; 203 61 ; 203 62 ; 203 63 ; 203 64 ; 203 66 ; 203 67 ; 203 68 ; 203 69 ; 203 70 ; 203 78 ; 203 79 ; 203 80 ; 203D / ; 568699 ; 570262 ;
Abstract
A process for the separation of dimethyl ether and chloromethane in mixtures A process for the separation of dimethyl ether and chloromethane in mixtures by two distillation steps. In the first step, the mixture is subjected to an extractive distillation with water, aqueous salt solutions or organic liquids as extractant, the top product being chloromethane. In the second step, the dimethyl ether is separated from the extractant.