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Extraction and Equilibrium of α-LNA in Supercritical Carbon Dioxide

Author: ChenYingZuo
Tutor: ChengJian
School: Wuhan Institute of Technology
Course: Chemical Engineering
Keywords: Supercritical Silkworm chrysalis α-linolenic acid Solubility Chrastil
CLC: TQ645.6
Type: Master's thesis
Year: 2010
Downloads: 117
Quote: 1
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Abstract


α-linolenic acid lowering blood pressure, lowering blood pressure, prevention of cardiovascular disease, and promote the development of the nervous system and other physiological functions, is known as the \Of pupa resource-rich, dry pupa body contains more than 30% of fat, wherein the α-linolenic acid is more than 30% of the fat content. In many countries continue to develop in order to solve the problem of inadequate people's dietary structure of α-linolenic acid, α-linolenic acid as additives or raw materials, health care products and pharmaceuticals. Therefore, study extracted from silkworm chrysalis α-linolenic acid technology, fully pupa resources utilization and development of the α-linolenic acid has important significance. Supercritical CO 2 extraction, Soxhlet, microwave extraction silkworm chrysalis oil, from extraction conditions, the nature of the extract compared three extraction methods. Through the pupa powder structural changes before and after extraction analysis the three extraction method of extraction mechanism. Studies have shown that: the supercritical CO 2 extraction extraction temperature low, high rate of oil extract good color, there is no solvent recycling and pollution problems, but the high-pressure conditions of higher equipment requirements; Soxhlet simple extraction equipment, high rate of oil, but the extraction time is long, large consumption solvent extract color; the microwave extraction extraction time is short, and requires only 50s, and the device is simple, mild extraction conditions, good selectivity, but the oil rate is low, the resulting oil color. Silkworm chrysalis fatty acids, fatty acid ethyl esters to supercritical CO 2 distillation extraction study also separation silkworm chrysalis 2 distillation extraction and frozen crystalline combination of supercritical CO fatty acid was studied. The results show that, the supercritical CO 2 silkworm chrysalis oil fatty acid alpha-linolenic acid content can be increased to 39.11% from 28.44%, α-linolenic acid content of fatty acid ethyl esters by distillation extraction 28.37% to 45.78% the supercritical CO 2 the distillation extraction separation effect of fatty acid ethyl esters than separation of fatty acids. Supercritical CO 2 extraction combined with frozen crystalline highest content of α-linolenic acid can be increased to 64.63% from 28.44%. Therefore supercritical CO 2 extracted and frozen crystalline combination can be more effective to improve the content of α-linolenic acid. The the supercritical CO 2 and the fatty acid ethyl Phase equilibria were studied, a different temperature corresponding to the phase separation pressure, the solubility and distribution coefficient was measured. The study showed that the unsaturated fatty acids of carbon chain length, number of double bonds is the closer, the closer its distribution coefficient. Chrastil equation associated with the experimental results, the fatty acid ethyl esters in the supercritical CO 2 solubility relational solubility predicted by the association with the experimentally measured values ??relative error of 8.9%. Chrastil equation associated experimental results using the modified fatty acid ethyl esters in the supercritical CO 2 solubility relational, of the type predicted solubility with the experimentally measured values ??relative error is 3.69%.

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CLC: > Industrial Technology > Chemical Industry > Chemical processing of oils and waxes industry, soap industry > Grease industrial products and by-products > Fatty acid
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