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Alternative hydrocarbon solvents for cottonseed extraction: Plant trials

Alternative hydrocarbon solvents for cottonseed extraction: Plant trials,10.1007/BF02635651,Journal of The American Oil Chemists Society,P. J. Wan,R.

Alternative hydrocarbon solvents for cottonseed extraction: Plant trials   (Citations: 2)
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Hexane has been used for decades to extract oil from cottonseed and is still the solvent of choice for the edible-oil industry. Due to increased regulations as a result of the 1990 Clean Air Act and potential health risks, the edible-oil extraction industry urgently needs an alternate hydrocarbon solvent to replace hexane. Based on laboratory-scale extraction tests, two hydrocarbon solvents, heptane and isohexane, were recommended as potential replacements for hexane. A cottonseed processing mill with a 270 MT/day (300 tons/day) capacity agreed to test both solvents with their expander-solvent process. Extraction efficiencies of isohexane and heptane, judged by extraction time and residual oil in meal, refined and bleached color of miscella refined oil, and solvent loss, were comparable to that of hexane. However, fewer problems were encountered with the lower-boiling isohexane than with the higher-boiling heptane. With isohexane, the daily throughput increased more than 20%, and natural gas consumption decreased more than 40% as compared to hexane.
Journal: Journal of The American Oil Chemists Society - J AMER OIL CHEM SOC , vol. 72, no. 6, pp. 661-664, 1995
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    • ...These alternative solvents are of interest for the following reasons: (i) isohexane is considered to be environmentally less harmful (2), and (ii) ethanol and IPA have potential to remove toxic, carcinogenic, and antinutritional factors, thereby improving the quality of extracted meal for food and feed products and increasing its economic value...
    • ...By using isohexane, the industry and the consumer may benefit from reduced processing costs, decreased energy usage, and fewer environmental hazards (2)...
    • ...Isohexane is a good choice for the base solvent, because n-hexane is considered to be a health risk (2)...
    • ...However, the recent report by Wan et al. (2) did not support the Osman et al. findings...
    • ...To produce cottonseed meal and miscella-refined oil with prime bleachable summer yellow (PBSY) color, cottonseed processing may be divided into four major steps (2,8,17): (i) seed preparation (flaking, cooking and expander treatment); (ii) extraction; (iii) miscella treatment for crude oil (evaporation or distillation for solvent regeneration and miscella refining); and (iv) meal treatment (desolventizing and toasting)...
    • ...As recently reported (2), isohexane has an economic advantage over n-hexane in cottonseed extraction...

    M. S. Kuket al. Cottonseed extraction with a new solvent system: Isohexane and alcohol...

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