Abstract
ABSTRACTA technologically feasible cottonseed oil‐isopropyl alcohol (IPA) miscella refining process was developed to produce Prime Bleachable Summer Yellow (PBSY) quality cottonseed oil. Individual steps necessary to refine cottonseed oil‐IPA miscella were determined and improved. The miscella was first neutralized with 20 Baume (Be′) caustic solution (50% excess) using a homogenizer. After centrifugation to remove soapstock, the two remaining liquid layers were separated and desolventized. The refined oils from bottom and top layers were then water washed using 12.5 and 20% hot water (w/w), respectively. Water washing efficiently recovered the oil from the top miscella layer and reduced soap and phosphorus contents. The water washed and dried oil from the bottom and top layers were treated with 0.5 and 4% (w/w) acid‐activated bleaching clay, respectively. Good quality bleached oil was then obtained. However, the quality of bleached oil produced from the bottom layer was better than that of the top layer. Comparative experiments with both IPA and hexane miscellas showed that quality of the refined oil from cottonseed oil‐IPA miscella is as good as that produced from the cottonseed oil‐hexane miscella using the process developed in this study.
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