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Studies on Purification of Plant Sterol

Author: WeiJiKang
Tutor: YangYiWen
School: Zhejiang University
Course: Chemical Engineering
Keywords: Sterol β- sitosterol Deodorizer distillate Transesterification Crystallization Extract
CLC: TQ645.98
Type: Master's thesis
Year: 2002
Downloads: 867
Quote: 12
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Abstract


In this paper, from deodorizer distillate extracted phytosterols process which includes sterol ester transesterification and transesterification was extracted - crystallization process two main processes . Deodorizer distillate in the raw material after pretreatment with sodium methoxide as a base catalyst , the raw material for the reaction with methanol , the raw material of the sterol esters into the free sterols . Experimental study of methanol / mass ratio of raw materials , sodium methoxide / quality of raw material ratio, reaction temperature, reaction time and other factors on sterol ester transesterification reaction. The results show that the boiling point of methanol , the conversion of sterol esters with the increase of temperature ; conversion increased with increasing reaction time , and gradually approach to equilibrium values. Get fit thesis research system sterol ester transesterification optimal conditions : methanol / materials mass ratio of 0.8 , sodium methylate catalyst / feedstock mass ratio 0.01,61 ℃, reaction time 2 hours . In this condition, the conversion of sterol esters make up about 93% . The optimized reaction conditions, the apparent rate equation is : (-r A ) = 833.3 * (0.00002388) 2.0 * (1-x A ) 0.9 (494.3-x A ) 1.1 -379.5 * (0.00002388) 2.4 * (1.408 x A ) 0.6 (52.26 x A ) 1.8 study materials extracted from the transesterification sterol process , mainly by cooling crystallization method . Take extraction - crystallization process can be more than 90% of sterol products ; when the solvent is n-hexane, added in a proportion of 2-3ml / g material , the sterol purity of about 99% can be achieved even . Sterol product was purified by recrystallization process can be achieved , the solvent can be acetone or hexane , respectively, in the initial temperature near the boiling point temperature of 54 ℃ or 65 ℃, the final temperature in 5 ℃, purity of about 99% can be achieved . Measured obtaining the melting range of 127-132 ℃.

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CLC: > Industrial Technology > Chemical Industry > Chemical processing of oils and waxes industry, soap industry > Grease industrial products and by-products > By-product processing and utilization > Sterol
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