8results about How to "Low iodine value" patented technology

The invention discloses a catalyst and a preparation method thereof, and a system and a method for continuously preparing methylhexahydrophthalic anhydride, and belongs to the technical field of methylhexahydrophthalic anhydride preparation. The catalyst has a double-layer structure, the outer layer is a stainless steel hollow structure, and the inner layer is a Raney nickel-cobalt metal structure. The catalyst not only has high activity and high hydrogenation efficiency of a Raney nickel catalyst, but also has the advantages of high strength, long service life, strong stability and the like, and can be used for preparing methylhexahydrophthalic anhydride. Besides, according to the system for continuously preparing methylhexahydrophthalic anhydride provided by the invention, the hydrogenation process is divided into two sections, and the catalyst is used for the second-section hydrogenation process, so that higher hydrogenation efficiency, shorter hydrogenation residence time and higher production efficiency can be obtained in this way, the saturation degree of a hydrogenation product is high, and the yield of the product is increased. The method has the advantages of low iodine value, light color number, high purity, higher yield, few byproducts and the like.

The invention discloses a preparation method of a composite leather fatliquor, and belongs to the field of chemical synthesis of leather fatliquor. The steps include: vegetable oil, trans-cinnamic acid and an organic solvent are mixed and dissolved to form a reaction solution, and the reaction solution is heated to 70°C~80°C and then an oil-soluble initiator is added for mixed reaction for 1h~2h to obtain a vegetable oil-based polymer; after the vegetable oil-based polymer, amphoteric surfactant and a copper ion-containing solution are mixed, an inorganic base is added to adjust the pH to 8~9 to catalyze chelation for 40min~80min to obtain a copper ion-plant oil-based polymer; copper ion-plant oil-based polymer is catalyzed by a vulcanizing agent to obtain a composite leather fatliquor. The present invention uses vegetable oil containing unsaturated carbon-carbon double bonds as a raw material, and uses trans-cinnamic acid of plant origin, environmentally friendly and fragrant as an odor improver to cover the smell of vegetable oil. After the two react, copper ions are chelated, and then the chelated copper ions are vulcanized and fixed, which solves the problem of easily producing unpleasant odors to greasy raw materials.

The invention relates to the technical field of grease fractionation finished products, and particularly discloses a preparation method of low-temperature-resistant high-iodine-value palm oil for a lubricant. The preparation method of the low-temperature-resistant high-iodine-value palm oil for the lubricant comprises the following steps: heating crude palm oil to completely dissolve the crude palm oil, then adding glyceryl stearate and cane sugar, and mixing to obtain a crude palm oil solution; cooling the palm crude oil solution to 21-23 DEG C, keeping the temperature constant, cooling to 11-13 DEG C, keeping the temperature constant, continuously cooling to 2-4 DEG C, keeping the temperature constant, continuously cooling to (-6)-(4) DEG C, and keeping the temperature constant to obtain a solid-liquid mixture; separating the solid-liquid mixture to obtain palm liquid oil; and adding a crystal inhibitor and an antioxidant into the palm liquid oil, and mixing to obtain a palm oil finished product. The palm oil finished product obtained through the preparation method has the advantages of being low in melting point, good in low temperature resistance, high in iodine value and high in yield, is suitable for being used as a lubricating agent and meets market requirements.

The invention discloses castor oil and a refining method thereof. The refining method comprises irradiating crude castor oil under the action of a composite photocatalyst; the composite photocatalyst is a catalyst of activated carbon loaded with transition metal oxides; and the irradiation is performed by ultraviolet light. The method has a simple process flow, low energy consumption, low production cost, is suitable for industrial production, and the prepared castor oil meets the requirements of injection-grade drugs.

The invention discloses a catalytic hydrogenation reactor and a catalytic hydrogenation method for treating a biomass raw material with a high acid value and a high iodine value, and belongs to the technical field of oil product hydrogenation. The catalytic hydrogenation reactor comprises a reactor pressure-bearing container, an inner cylinder, an ash discharge port, a feeding assembly, a reaction assembly and a discharging assembly, the inner cylinder is arranged in the reactor pressure-bearing container, the feeding assembly and the reaction assembly are arranged in the inner cylinder, the reaction assembly comprises a ceramic tube bundle internal part, the discharging assembly is arranged above the inner cylinder, and the discharging assembly is arranged above the inner cylinder. The ash discharge port is formed in the center of the bottom of the reactor pressure-bearing container. By arranging the ceramic tube bundle inner part, selective hydrogenation of the high-acid-value and high-iodine-value biomass raw material is realized under the combined action of the solid catalyst and the liquid catalyst, the iodine value is effectively reduced, and coking of the high-iodine-value biomass raw material in the reaction process is avoided; in addition, the acid value is maintained as far as possible while the iodine value is reduced, and the solid catalyst and the catalytic hydrogenation reactor are not corroded, so that the stability of the solid catalyst and the yield of the product are improved.

The invention provides a preparation process and application of novel phosphatidylated carnosic acid, and the preparation process comprises the following steps: mixing 3-5 parts by mass of soybean phospholipid and 1-3 parts by mass of modified soybean phospholipid, melting at low temperature, adding 5-10 parts by mass of carnosic acid, mixing, and curing at low temperature to obtain the novel phosphatidylated carnosic acid. The preparation method of the modified soybean phospholipid comprises the following steps: (1) adding organic acid into soybean concentrated phospholipid serving as a raw material, and uniformly stirring for later use; and (2) continuously adding the material prepared in the step (1) into an absorption tower, intermittently or continuously blowing ozone into the absorption tower at the same time, enabling the material to be in contact with the ozone to carry out oxidation reaction, discharging the material from the absorption tower, and drying at the vacuum degree of 0.095-0.1 Mpa to prepare the modified soybean phospholipid. After the carnosic acid is phosphatized, the stability can be improved, and the bioavailability of the carnosic acid can be enhanced. The application of the compound in the fields of food, food additives, animals, pets, cosmetics or other antioxidation and the like is expanded.

This invention provides a method for preparing epoxidized soybean oil and a composition for preparing epoxidized soybean oil. The preparation method includes the following steps: mixing soybean oil, an oxidant, a catalyst, and an auxiliary agent, and carrying out an epoxidation reaction to obtain epoxidized soybean oil; wherein, the oxidant is selected from a solution containing organic peroxides; the auxiliary agent is selected from sodium salts of organic acids, and the sodium salts of organic acids are selected from at least one of sodium alkylates and sodium tungstate. The preparation method effectively inhibits the occurrence of side reactions such as ring-opening reactions and excessive oxidation of unsaturated double bonds during the epoxidation process of epoxidized soybean oil by adding sodium alkylates and / or sodium tungstate as auxiliary agents during the preparation of epoxidized soybean oil, significantly improving the epoxy value and epoxy bond stability of epoxidized soybean oil while maintaining a relatively low iodine value.

The invention relates to the technical field of chemical engineering, in particular to an impurity removal method in the isostearic acid preparation process. According to the impurity removal method, in the process of preparing isostearic acid by taking monomer acid as a raw material, a catalyst is added into a reaction system, and a catalytic hydrogenation reaction is performed in the presence of hydrogen, so that impurities in the reaction system are subjected to ring-opening conversion into stearic acid, and then impurity removal is realized and high-purity isostearic acid is obtained. The monomer acid is used as a raw material, the composite catalyst is used, kettle type hydrogenation reaction is carried out, the low iodine value requirement of a hydrogenation product is met, meanwhile, the impurity stearic acid lactone difficult to separate in the monomer acid raw material is converted into stearic acid, separation and purification of isostearic acid are easy, and the purity of isostearic acid is improved.