摘要:
A process for preparing fat and/or oil with a modified distribution of fatty acids in the glycerides by heterogeneously catalysed transesterification, wherein the process comprises reaction of the fat and/or oil of biological origin to be transesterified in the presence of a catalyst consisting of a metal salt of a basic amino acid or an amino acid derivative. The disadvantages of conventional transesterification processes can be overcome by using this catalyst.
摘要:
A process is described for extracting carotenes from carotene-containing materials, in particular from fats and oils of biological origin, which provides for extraction of carotene-containing material with an extractant comprising at least one member selected from the group consisting of acetonitrile, N-methylpyrrolidone, N,Ndimethylformamide, N,N-dimethylacetamide, 4-formylmorpholine, 4-acetylmorpholine, 4-methylmorpholine, 4-phenylmorpholine.
摘要:
A method for synthesizing alkyl glucosides by the acetalization of sugars, particularly glucose, with alcohols in excess and subsequent separation of the excess alcohol by extraction, the extraction being carried out with an extraction agent, which is close to the critical point at a reduced pressure in the range of 0.8 to 1.3 and preferably of 0.9 to 1.2 at pressures, which are selected so that the density of the extraction agent, which is close to the critical point, is greater than 180 kg/m.sup.3.
摘要翻译:通过将醇,特别是葡萄糖与醇过量缩合并随后通过萃取分离过量的醇来合成烷基葡糖苷的方法,用萃取剂进行萃取,该提取剂在减压下接近临界点 在0.8至1.3的范围内,优选在0.9至1.2的压力下进行选择,使得接近临界点的萃取剂的密度大于180kg / m 3。
摘要:
Described is a process for removing glycerol and/or diglycerol from glycerides and glyceride mixtures by extraction, which process is characterized in that the glyceride or glyceride mixture is dissolved in organic compounds which preferably contain carbonyl and hydroxyl groups, if desired in combination with hydrocarbons, and that glycerol is extracted from the resulting solution with the aid of water. Thereby glycerol concentrations in the material to be purified of 0.1 weight % or lower may be obtained in a simple manner.
摘要:
In a process for the production of carbon fibers from high boiling bituminous substances in which a purified and polymerized concentrated carbon fiber precursor is spun into fibers which are oxidized and then carbonized and optionally graphitized, the improvement comprising just before spinning a supercritical gas is dissolved in mesophase pitch at a pressure of 100 to 350 bars and a temperature up to 150.degree. K. below the melting temperature of the mesophase pitch to form a low viscosity melt, separating the latter into an isotropic phase and an anisotropic carbon fiber precursor and spinning the latter into fibers whereby the spinning temperature is lowered and the mesophase contact is increased due to the viscosity lowering activity of the supercritical gas.
摘要:
A method of removing salts from coal tar and coal pitches comprising washing coal tar or coal pitch in a pressure container with water and a carbon dioxide containing gas at a temperature and pressure near the critical point of the gas in the optional presence of at least one member of the group consisting of a solvent and an entraining agent, removing the liquid or dissolved tar or pitch to obtain tar or pitch with a low salt content and removing the aqueous phase whereby all the resins remain in the tar or pitch.
摘要:
Process for preventing the precipitation of elementary sulfur in the riser pipes of probes for natural gas including a solvent for sulfur. For the dissolution of the precipitating elementary sulfur an ester of an optionally mono- or poly-unsaturated fatty acid and/or the reaction product of H.sub.2 S with an ester of a mono- or poly-unsaturated fatty acid, optionally in solution, is used. The solvent for sulfur is liquid under the conditions in the mining probe and only slightly soluble in the gas.
摘要:
Disclosed is a process for gasifying solid carbon fuels with steam. After forming a supersaturated solution of catalyst in steam the pressure is reduced to reaction pressure.
摘要:
A method for removing free fatty acids from fats or oils of biological origin or their steam distillates by extracting the free fatty acids with a mixture of basic organic nitrogen compounds and water as an extraction medium at a temperature below the boiling point of the organic nitrogen compounds. The content of the basic organic nitrogen compounds in the extraction medium is 20-30% by weight. In this manner, the formation of a viscous soapstock which is difficult to remove is prevented. The boiling point of the basic organic nitrogen compounds used is the same as or above boiling point of water and below the boiling point of the fatty acids to be extracted in order to enable simple recovery of the extraction medium.
摘要:
The invention concerns a method for producing fatty acid esters from fatty acid triglyceride and in particular from animal or vegetable fats and oils by transesterification with a monovalent low-molecular weight alcohol in the presence of a homogeneous or heterogeneous catalyst. In accordance with the invention, the formed fatty acid ester is extracted from the reaction mixture by means of a near-critical extractant. In this way fatty acid esters are obtained at high yield and excellent purity. As the extractant preferably a low pressure gas having a reduced temperature at 20° C. of about 0.7, preferably of equal to or greater than 0.7, is employed. Preferred extractants are carbon dioxide, propane, butane, dimethyl ether, ethyl acetate or mixtures thereof.