Fractionation of multicomponent dimethylnaphthelenes feeds by se

Details Fractionation of multicomponent dimethylnaphthelenes feeds by se Fractionation of multicomponent dimethylnaphthelenes feeds by se

1974-08-08

1976-12-07

Emery, Stephen J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

23296, 23273F, 260674R, 260674N, 62538, 62542, B01D 902, C07C 714

Patent

active

039960315

ABSTRACT:
A process and system for separating a preferentially crystallizable component A from a feed, wherein a series of zones are used between which mother liquor can flow without passage of crystallized material. Liquid feed is introduced to a zone other than the end zone from which effluent rich in component A is withdrawn. During one stage gradating crystallization temperature pattern is established throughout the series ranging from relatively low to relatively high, causing component A to crystallize in each zone; and mother liquor is caused to flow toward the low temperature end, while a portion of previously withdrawn effluent rich in component A is returned to the higher temperature end and effluent lean in component A is removed from the lower temperature end. In another stage a higher temperature pattern is established throughout the series whereby at least a portion of crystallized material melts in each zone, and mother liquor is caused to flow in the opposite direction while an equivalent amount of effluent rich in component A is withdrawn from said end zone.

REFERENCES:
patent: 2620263 (1952-12-01), Macklin
patent: 2747973 (1956-05-01), Hinrichs
patent: 3261170 (1966-07-01), McCarthy
patent: 3305320 (1967-02-01), Waech
patent: 3392539 (1968-07-01), Grimmett
patent: 3501275 (1970-03-01), Sailer
patent: 3694167 (1972-09-01), Gaillard

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