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Water recycle method for washing alkali‐refined soybean oil
Author(s) -
Eisenhauer R. A.,
Beal R. E.,
Griffin E. L.
Publication year - 1970
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02640404
Subject(s) - soybean oil , reuse , oil refinery , pulp and paper industry , alkali metal , chemistry , waste management , ion exchange resin , wastewater , environmental science , environmental engineering , engineering , organic chemistry , food science
Vegetable oil refineries are faced today with cutting down on pollution caused by their waste water. A method was developed for washing alkali‐refined soybean oil with treated, recirculated wash water. In this method, wash water passes through a cation exchange resin that removes Na, and the slightly acid water goes back into the system for continuous reuse. The disposal problem arising from current industrial practice can be largely or entirely avoided by this reuse method. The new method might well be applicable to other oilseed processing. Batch tests were first made by mixing water, alkalirefined soybean oil and cation exchange resin. The amount of Na in the soybean oil was reduced from 34 to less than 0.5 ppm. In continuous washing tests conducted in a Podbielniak contactor with water treated by a cation exchange resin, the Na level of a commercially refined oil (not water‐washed) was reduced from 34 ppm to less than 1.5 ppm. These results are comparable to or better than those obtained by the conventional method of employing fresh water for washing soybean oil.