Abstract:
A typical traditional reactor for hydrogenation consists of a tank filled with a liquid and a gas and a small particle catalyst. The reaction is carried out at high pressures and high temperatures. Lack of gas on the catalyst surface limits the velocity of reaction. Much work has been done to increase the quantity of gas on the catalyst. It has not been possible to solve this problem effectively with the techniques of today. According to the invention an extra solvent is added to the reaction mixture. By bringing the whole mixture (solvent, substrate, hydrogen and reaction products) to super-critical or near-critical state, a substantially homogeneous mixture can be obtained. By this method it is possible to control the concentration of gas on the catalyst to the desired level. The velocity of reaction is thereby increased considerably. The hydrogenation reactions principally involved comprise hydrogenation of carbon-carbon double bonds (C.dbd.C) in lipids; hydrogenation of COOR to C--OH and HO--R to produce fatty alcohols; and direct hydrogenation of oxygen to hydrogen peroxide.
Abstract:
Process for the hydrogenation of functional groups in hydrogenatable substrates, wherein hydrogen gas is mixed with the substrate and a solvent, the mixture is brought into contact with a catalyst. The hydrogenation is carried out under process conditions which are adapted to the activity of the catalyst used, wherein the temperature is sufficiently low, the substrate concentration is sufficiently high and the diffusivity is sufficiently high to provide a selective hydrogenation of the functional group having a higher reactivity than one which has a lower reactivity. The functional groups can for example comprise different C═C-groups in substrates in the form of lipids, primarily fatty acids and fatty acid derivatives, such as triglycerides and methyl fatty acids. Partially-hydrogenated fatty acids/fatty acid derivatives can hereby be obtained, which possess a low content of trans-fatty acid content as well as high selectivity in the form of SLn-number and SLo-number.
Abstract translation:在可氢化基底中氢化功能基团的方法,其中氢气与基底和溶剂混合,使混合物与催化剂接触。 氢化是在适合于所用催化剂的活性的工艺条件下进行的,其中温度足够低,底物浓度足够高,扩散性足够高以提供具有较高的官能团的选择性氢化 反应性比具有较低反应性的反应性。 官能团可以例如包括脂质形式的底物中不同的C-C基团,主要是脂肪酸和脂肪酸衍生物,例如甘油三酸酯和甲基脂肪酸。 因此可以获得部分氢化的脂肪酸/脂肪酸衍生物,其具有低含量的反式脂肪酸含量以及高选择性,其形式为S-Ln- Lo SUB> - 数字。
Abstract:
A method for preparing a dispersion of polar lipids in an ethanol-water mixture, the polar lipids including galactolipids. An oil containing polar lipids including galactolipids is diluted using a first ethanol-water mixture having an ethanol concentration close to the critical polarity, wherein upon dilution the polar lipids form a lamellar liquid-crystalline phase, without first forming a hexagonal HII-phase. The invention also refers to an oil obtained by evaporating ethanol and water from the dispersion. The invention further refers to aqueous colloidal dispersions of polar lipids including galactolipids, to an oil containing polar lipids including galactolipids and to pharmaceutical, cosmetic and food compositions including such dispersions and/or oil.
Abstract:
A method for preparing a dispersion of polar lipids in an ethanol-water mixture, the polar lipids including galactolipids. Anoil containing polar lipids including galactolipids is diluted using a first ethanol-water mixture having an ethanol concentration close to the critical polarity, wherein upon dilution the polar lipids form a lamellar liquid-crystalline phase, without first forming a hexagonal HII-phase. The invention also refers to an oil obtained by evaporating ethanol and water from the dispersion. The invention further refers to aqueous colloidal dispersions of polar lipids including galactolipids, to an oil containing polar lipids including galactolipids and to pharmaceutical, cosmetic and food compositions including such dispersions and/or oil.
Abstract:
A method for separating neutral and polar lipids from an oil of biological material, wherein the oil is fractionated using a mixture of a polar solvent comprising at least one carbon atom, water and an additional substance selected from the group consisting of: mono-, di- and oligosaccharides comprising from 3 to 10 monosaccharide units, said additional substance is present in an amount of at least 0.1 wt % calculated on the total weight of solvent, water and additional substance, to form at least two liquid fractions having different densities, wherein one fraction is rich in polar lipids and another fraction is rich in neutral lipids. An oil rich in polar lipids obtained from the method is disclosed, said oil I contains at least 40, preferably at least 50 lipid % polar lipids as calculated on the total amount of lipids in said oil and that the total amount of polar solvent and water in said oil is between 20 and 30 wt %. An oat oil containing high amounts of estolides of DGDG can further be obtained.