C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 11/00 (2006.01) B01D 5/00 (2006.01) C07C 7/09 (2006.01) C07C 9/00 (2006.01) F25J 3/06 (2006.01)
Patent
CA 2107936
Abstract of the Disclosure A method of and apparatus for separating C4 hydro- carbons from a feed comprising a gaseous mixture. The feed is cooled and partially condensed in a plurality of successive stages of condensation and phase separation. A gaseous overhead from each separation stage is further cooled and supplied to the next separation stage and the liquid separated from each stage is used to cool the gas. Further refrigera- tion is supplied to the gas to effect the condensations by indirect heat exchange with a closed cycle refrigerant subjected to a compression/expansion cycle. The feed under- goes no compression and no abrupt expansion during the separation, so that the feed undergoes a pressure decrease due only to friction of the passage of the feed through the apparatus. The pressure loss is no more than about 20 psi. The temperature of the feed is maintained below 150°F at all times, to prevent polymerization of 1,3-butadiene. A mixed refrigerant passes through the closed refrigeration cycle and contains, in decreasing order of plentitude, propane, ethyl- ene, isopentane and nitrogen. The mixed refrigerant is subjected to a single compression followed by cooling and phase separation. The phases of the mixed refrigerant thus separated are separately cooled and expanded and the material thus produced by expansion is used to cool the feed. :
Dupuis Gerard
Ha Bao
Tanguay Dennis C.
Liquid Air Engineering Corporation
Smart & Biggar
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