165 results about "Fatty acids.ethyl esters" patented technology

The invention discloses a method for preparing alkane by high fatty acid ester, which is characterized in that liquid-phase catalytic hydrogenation deoxidation is carried out on the high fatty acid ester to obtain the alkane. The high fatty acid ester, catalyst and solvent are added into a reactor, then hydrogen is charged into the reactor with reaction pressure at 1-10MPa and temperature at 210-320 DEG C, and the reaction time is 4-7h; the high fatty acid ester is fatty acid methyl ester containing 8-22 carbon atoms or fatty acid ethyl ester containing 8-22 carbon atoms; catalyst uses a multi-wall carbon nanotube as carrier and 2-10% of palladium in percentage by weight as active component ; the solvent is one of n-hexane, n-heptane, n-octane, dodecane, or hexadecane. In the invention, the preparation process is simple, the reaction temperature is low, the usage of solvent is less, the combustion high value of the target product is high, and the catalyst can be recycled.

The invention discloses a concentrated solution for a pesticide composition and an application method thereof. An active ingredient of the concentrated solution for the pesticide composition is pyrethrins or pyrethroid, a solvent is fatty acid methyl ester or fatty acid ethyl ester, and an additive comprises a food-grade or natural antioxidant and an emulsifying agent. The concentrated solution for the pesticide composition can also comprise plant essential oil which is taken as a synergistic agent. The concentrated solution for the pesticide composition has the advantages that the concentrated solution for the pesticide composition is a pesticide composition with quick knockdown and long-acting effect; and the fatty acid methyl ester as the solvent is a low-volatility organic compound and a material with low maximum ozone generation activity, which reduces the harm of a pesticide to human beings and the environment. The concentrated solution for the pesticide composition forms an oil-in-water emulsifying preparation after the dilution to directly serve as a spraying agent for disinsectization application, or forms a water-in-oil demulsifying agent after being mixed with water and odorless gas to serve as an aerosol for disinsectization application. The concentrated solution for the pesticide composition can be used for the control of insect damage of winged insects and reptiles, indoor dust mites, head louses or body louses of human beings and so on, and the anthelminthic treatment of clothes, and can also be used as a sterilizing agent and a fungicide on a target object.

The invention discloses a method for transforming fatty acid ethyl ester into glyceride, which comprises the following steps of: mixing the fatty acid ethyl ester and glycerol in a material tank; making the material pass through a glycerol separator by using a pump to separate free glycerin; then putting the material in a reactor in which immobilized lipase is filled; and making the material passthrough a packed tower to remove ethanol; making the material finally flow back to the material tank for performing 6 to 300h circular reaction; then carrying out molecular distillation on the reaction product to remove the unconverted reactant so as to obtain glyceride products. The method can improve the stability and bioavailability of the products, and has high application value for transforming functional fatty acids such as ethyl ester fish oil, algae oil, conjugated linoleic acid, arachidonic acid and the like into glyceride products.

The invention discloses a production method for coproducing unsaturated monoglyceride by using a diglyceride enzyme method. The method comprises: (1)adding absolute ethyl alcohol into a natural grease, carrying out an alcoholysis reaction under catalysis of immobilized lipase, making the generation rate of fatty acid ethyl ester to be 5-40%w/w, and removing the residual alcohol to obtain an alcoholysis product; (2) adding 5-15%w/w of glycerin into the alcoholysis product of step (1), then reacting the above mixed substrates in a packed-bed enzyme reactor filled with immobilized lipase under a vacuum condition; and (3) performing molecular distillation on the reaction product of step (2), and separating to obtain a high-temperature fraction which is a diglyceride-containing product and a low-temperature fraction which mainly comprises monoglyceride. The reaction system of the invention needs no water, therefore the problem of product acid value is solved, and then coproduction of monoglyceride is realized; and the glycerin does not need preadsorption processing, and therefore the production operation is simplified.

An ethylester of fatty acid containing high-content and-purity DHA and high-purity EPA, especially EPA-E and DHA-E in weight ratio of 1: (1.01-38), a medicine prepared from it for preventing and treating hyperlipemia, angina pectoris and cerebral infarction, and its preparing process are disclosed.

A method for reducing the acid value of biodiesel oil is characterized in that: rectification of crude fatty acid methyl ester or fatty acid ethyl ester is carried out; a deacidification agent occupying 0.02 to 4 percent of the total weight of fine fatty acid methyl ester or fatty acid ethyl ester is added after the rectification; the mixture is gradually heated up to 60 to 80 DEG C inside a stirring reaction kettle, and is put in a settling tank when the stirring reaction is carried out for 0.2 to 0.5 hours; after 2-hour settlement, the lower-layer deacidification agent is discharged; the acid value of an upper layer is measured, and the upper layer is put in a finished product tank after the acid value is up to standard; and the deacidification agent can be used repeatedly. The method is simple and does not need complex equipment; meanwhile, the method has low production cost and ideal deacidification effect, and the diesel oil manufactured by the method accords with national standard; the separated deacidification agent can be used repeatedly to produce naphthenic acid amide which is a chemical raw material and can increase the economic benefits of a biodiesel oil enterprise. Tests and a standard method adopted to measure the acid value of biodiesel oil before and after deacidification show that the acid value of biodiesel oil can be reduced more than 90 percent when deacidified through adopting the method.

The invention relates to a method for preparing fish oil ethyl ester by microwave esterification and purifying ethyl eicosapentaenoate, which comprises the following steps: adding fish oil, absolute ethanol and catalyst concentrated sulfuric acid into a reaction vessel, and heating under reflux in a microwave reactor to convert free fatty acid into fatty acid ethyl ester; after the reaction is carried out for 10-30 minutes, removing excessive solvent and catalyst from the product, and drying to obtain the fish oil fatty acid glyceride of which the acid value is smaller than 2; preparing the pre-esterified fish oil, absolute ethanol and catalyst KOH into a KOH-ethanol solution, adding the KOH-ethanol solution into the reaction vessel, and heating under reflux in the microwave reactor to carry out the ester exchange process; and after the reaction is carried out for 5-15 minutes, stratifying the product by standing or centrifuging, removing the understratum glycerol, removing the excessive ethanol and catalyst, and drying to obtain the ethyl eicosapentaenoate. The invention adopts two-stage vacuum rectification: light components with lower boiling point than ethyl EPA (eicosapentaenoate) are removed in the primary rectification tower; and the component subjected to light component removal enters a secondary rectification tower to separate the ethyl EPA from ethyl DHA, thereby obtaining the ethyl EPA with the purity of higher than 97%.

The invention discloses a method for improving purity of eicosapentaenoic acid ethyl ester in fish oil. The method comprises steps as follows: the fish oil is subjected to transesterification, and a fatty acid ethyl esterification product is obtained; the fatty acid ethyl esterification product is subjected to urea inclusion, and a urea inclusion mixture is obtained; the urea inclusion mixture is subjected to at least three stages of molecular distillation, and a molecular distillation product is obtained; the molecular distillation product is subjected to rectification. According to the method, the technology is simple, the content of eicosapentaenoic acid ethyl ester in the fish oil can be effectively increased, meanwhile, the content of docosahexaenoic acid ethyl ester is reduced, and the separation effect is good, so that eicosapentaenoic acid ethyl ester can be better applied to industrial production.

A method allowing, from natural fat or oils, vegetable or animal, or from other glyceride mixtures, to obtain in a quasi-quantitative way fatty acid ethyl esters that can be used as gas oil substitutes, comprises the succession of stages as follows: a stage (a) wherein the oil, the fat or the glyceride mixture is transesterified by ethanol using a soluble catalyst or a catalyst that becomes soluble during the reaction, a stage (b) wherein the glycerin formed is decanted and removed, without requiring an excess ethanol evaporation operation, a stage (c) wherein a second transesterification reaction is carried out so as to obtain a product whose ester content is at least 97% by mass, a stage (d) wherein evaporation of the excess ethanol is carried out in the presence of the catalyst under suitable conditions preventing a reverse transesterification reaction, the ethanol being obtained practically anhydrous (it can be recycled in the process without requiring rectification), a stage (e) wherein the, ester undergoes purification by means of water wash sequences, and a stage (f) wherein the ester mixture is dried under reduced pressure.

The invention provides quercetin derivatives. The chemical structural general formulas of the quercetin derivative is as shown in the specification; and the synthetic method of the quercetin derivative comprises the following steps: (1) taking a carbonate and the like as the acid-binding agents and potassium iodide as the catalyst, and reacting the quercetin with a halogen substitute of fatty acid ethyl ester; (2) separating and purifying by silica gelcolumn chromatography, and collecting the same components to obtain three yellow powdery compounds: quercetin ester derivatives; and (3) taking the synthesized derivatives as the reactants, respectively, adding NaOH aqueous solution and taking polyethylene glycol as the phase transfer catalyst; separating and purifying by silica gelcolumn chromatography, and collecting the same components to obtain quercetin carboxylic acid derivatives, respectively. The synthetic method of the series quercetin derivatives provided by the invention is simple and easy to operate; the yield of each product is high; and the series quercetin derivatives are remarkably improved in both water solubility and lipid solubility compared with the quercetin.

A process for synthesizing the polyester of glycofatty acid from methyl ester (or ethyl ester) of fatty acid features that the film evaporator or molecular distiller is used for cyclic distilling multiple times for increasing the reaction efficiency and esterifying degree while excessive methylester (or ethyl ester) can be distilled out.

The invention belongs to the technical field of fine chemical engineering, and discloses fatty glyceride as well as a preparation method and an application thereof. The fatty glyceride is prepared from the following components by mole percent: 20-60mol% of glycerinum, 5-50mol% of component A, 1-50mol% of component B and 0-10mol% of component C, wherein the component A is octanoic acid, methyl caprylate or ethyl caprylate, the component B is decanoic acid, methyl decanoate or ethyl decanoate and the component C is saturated fatty acid, fatty acid methyl ester or fatty acid ethyl ester with 12-16 carbon atoms. The preparation method comprises the following steps: carrying out a reaction on the components and a catalyst at a normal pressure at 130-180 DEG C for 1-6 hours in nitrogen; then, carrying out a decompression reaction at 130-210 DEG C for 1-6 hours and dehydrating to obtain the fatty glyceride. The fatty glyceride obtained has an extremely good synergic tackifying effect and good foaming characteristic and foaming behavior and can be used as a thickener for synthesis of daily detergent products and cosmetics.

Compositions for adjusting coal bulk density and methods of using the compositions are provided. In an embodiment, the present invention provides methods of utilizing the compositions to adjust coal bulk density. The compositions can comprise one or more components selected from a group consisting of vegetable oils, animal fats, triglycerides, fatty acids, fatty acid methyl esters, fatty acid ethyl esters, and glycerin. These compositions can be derived from a biodiesel manufacturing process or transesterification reactions involving triglycerides.

The invention provides a preparation method of phytosterin ester rich in oleic acid, which comprises the following steps: firstly, leading seed fat rich in oletic acid and ethanol to perform alcoholysis reaction under the action of catalyst to obtain fatty acid ethyl ester rich in oleic acid; secondly, leading the fatty acid ethyl ester rich in oleic acid and phytosterin to perform the ester exchange reaction under the action of the catalyst, and removing unreacted ethanol and redundant fatty acid ethyl ester so as to obtain crude phytosterin ester rich in oleic acid; thirdly, obtaining primrose yellow to white thick fluid by decoloring the phytosterin ester, i.e. refined phytosterin ester. The oleic acid content of the seed oil is more than 60 percent; and high-content oleic acid reduces the side reaction and improves the yield of the phytosterin ester. The preparation method does not use deleterious organic solvent and produce deleterious materials during the whole preparation, has lower requirement on reaction condition, and is suitable for industrial mass production of food.

The present invention relates to the provision of genetically modified fungal cells, such as yeast cells with an improved ability for producing different fatty acids and specifically fatty acid ethyl esters (FAEE), the main components of biodiesel. An increased in fatty acid production, and hence in FAEE, is obtained in the first place by expressing different heterologous polypeptides in combination with the down-regulation, attenuation, deletion or over-expression of specially selected genes, wherein said genes encode enzymes involved in the fatty acids synthesizing pathway, fatty acid consuming pathways, carbohydrate biosynthesis pathways or enzyme acting as wax ester transporters or a combination thereof. The methods and products of the invention would allow large-scale production of FAEE with carbohydrates as the only externally-supplied substrate.

Water-based drilling mud lubricants using a blend of fatty acid polyamine salts and fatty acid esters give synergistically better lubricity results than either component used separately. For example, the blends with different ratios of fatty acid diethylenetriamine salt and fatty acid methyl ester demonstrate much better lubricity in water-based drilling fluids than those where only fatty acid diethylenetriamine salt or fatty acid methyl ester are separately used. The amines in fatty acid amine salt might also include other polyamines, such as butanediamine pentamethylenediamine, spermidine, spermine, propylene diamine and propylene polyamines. The fatty acid esters might also include fatty acid ethyl ester, fatty acid glycerol ester and fatty acid trimethylolpropane ester. The carbon numbers of the fatty acids used to make the components in the lubricant blend may range from C4 to C28.

The present invention belongs to the technical field of biological pharmacy, and provides a method for preparing concentrated fish oil fatty acid glyceride. The method comprises: preparing fatty acid ethyl ester by using refined fish oil as a raw material, carrying out a supercritical fluid extraction treatment on the fatty acid ethyl ester, concentrating, and carrying out an enzyme reaction treatment by using lipase. With the method of the present invention, EPA and DHA in natural fish oil can be effectively converted into the unsaturated fatty acid ethyl esters while the saturated fatty acid ethyl ester type fish oil is converted into the unsaturated fatty acid glyceride so as to be concentrated, such that the EPA content and the DHA content in the concentrated fish oil fatty acid glyceride can be effectively improved, the process steps are simplified, and the cost is reduced.

The invention discloses a method for preparing low condensation point biodiesel from high acid value oil. Animal and vegetable oils with the acid value higher than 80mgKOH/g serving as a raw material and mixed alcohol of methanol, ethanol and isopropanol undergo esterification and interesterification two-step reaction to prepare the low condensation point biodiesel. The intersolubiltiy of the oil and the methanol is improved by the ethanol so as to promote the methyl esterification reaction; meanwhile, the product contains a small amount of fatty acid ethyl esters, and new solid catalysts of tungsten molybdophosphate and phosphotungstic acidesterification replace concentrated sulfuric acid in the esterification reaction; and in the interesterification reaction, the ethanol and the isopropanol promote the conversion of glyceride, and simultaneously the product contains partial fatty acid ethyl esters and branched-chain aliphatic esters. Therefore, the reaction is easy to carry out, the cold flow properties of the biodiesel can be improved and the condensation point of the biodiesel can be reduced.