C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/663.2
C07C 17/02 (2006.01) C07C 17/38 (2006.01) C07C 19/045 (2006.01) A62D 3/00 (2006.01)
Patent
CA 1313884
1880025 PROCESS FOR DETOXIFYING A BOTTOMS DRAW-OFF FROM A HIGH TEMPERATURE CHLORINATION REACTOR ABSTRACT OF THE DISCLOSURE Under certain operating conditions, an emulsion of an acidified unfiltrable tarry bottoms stream from a reactor for the chlorination of ethylene to 1,2-dichloroethane can be demulsified and separated in a phase separation tank. The presence of FeC13 in an amount more than 5 ppm Fe in the separated organic waste, fouls the reboiler and lower internals of a "heavies" column in which the separated organic waste is concentrated, and deactivates the cata- lyst in a Catoxid fluid bed reactor in which the concen- trate is burned. By maintaining an iron salt chlorination catalyst in a concentration which results in 2000 ppm to 4000 ppm of Fe in the HTC reactor bottoms, and operating the HTC reactor at a temperature in the range from about 90°C to 120°C and a pressure in the range from 9 psig to 12 psig, an unfiltrable reactor bottoms drawoff is produc- ed which may be acidified without forming an emulsion. Formation of an emulsion is avoided by mixing each volume of the HTC bottoms drawoff with at least 50 volumes of dilute aqueous HCl in a concentration range from 2 to 4% so as to demulsify the emulsion into aqueous acid and organic phases. The mixture is gravity-separated in a phase separation tank by decantation. The lower layer (60- 70% by wt EDC, the remainder being heavies) is concentrat- ed by recovering EDC overhead and producing a bottoms concentrate in which the Fe is present in no more than 50 ppm. The concentrate may be economically disposed of in a Catoxid reactor using a support free gamma alumina cata- lyst found to be highly sensitive to iron.
588323
Alan William
Schneider Wolfgang W.
Alan William
Goodrich (b.,f.) Company (the)
Schneider Wolfgang W.
Swabey Ogilvy Renault
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