Method for reducing the cloud point of materials using an ultraf

Details Method for reducing the cloud point of materials using an ultraf Method for reducing the cloud point of materials using an ultraf

1988-08-12

1989-10-17

Sever, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

208 31, 208308, 208321, 210652, 585819, B01D 1300

Patent

active

048745235

ABSTRACT:
A method is disclosed for reducing the cloud point of materials comprising the steps of chilling the waxy oil so as to achieve submicron crystallization followed by ultrafiltration thereby effecting separation of a permeate of reduced cloud point from a retentate. Chilling to produce submicron crystallization is to a temperature about 3.degree. C. or less above the cloud point of the material, preferably from 0.5.degree. to 2.degree. C. above the cloud point of the material, most preferably between 1.degree. to 2.degree. C. above the cloud point of the material. In general any mixture, solution or melt containing components which crystallize at different temperatures can be separated by this procedure. The method is especially useful for reducing the cloud point of waxy hydrocarbon oils. The ultrafiltration membrane used will be one which is inert in and non-reactive with the components of the solution, mixture or melt, will not melt at the temperatures employed, which possesses an effective pore size smaller than the submicron crystals formed upon chilling and which does not have a strong chemical affinity for the crystallized component of the feed mixture, solution or melt.

REFERENCES:
patent: 3223624 (1965-12-01), Paulson
patent: 4129583 (1978-12-01), Zondek
patent: 4496456 (1985-01-01), Hafez et al.
patent: 4532041 (1985-07-01), Shuey et al.
patent: 4541972 (1985-09-01), Wernick
patent: 4678555 (1987-07-01), Wernick
"New Separation Technique for the CPI", Michaels, Chemical Engineering Progress, vol. 64, No. 12, pp. 31-42 (1968).
"Membranes for Pressure Permeation", Friedlander et al., Membrane Processes in Industry and Biomedicine, Brier (ed), Plenum Press, New York-London, pp. 73-99 (1971).

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