52 results about "Methyl levulinate" patented technology

The invention relates to cutting fluid, in particular to semi-synthetic metal cutting fluid. The semi-synthetic metal cutting fluid is prepared by methyl levulinate, (R)-(+)-2,4-dyhydroxy-N-(3-hydroxypropyl)-3,3-dimethylbutyramide, 2-oxo-1,5-disoidum glutarate dihydrate, 4-piperidone-3-carboxylate hydrochloride and trimethylsilylketene. The semi-synthetic metal cutting fluid has good cooling, anticorrosion, antirust and lubricating performance, service life of a knife can be prolonged effectively, and excellent machining accuracy can be realized; the semi-synthetic metal cutting fluid can play a role in safely and reliably protecting and inhibiting corrosion of nonferrous metal like aluminum and steel and ferrous metal, so that time and cost for subsequent treatment can be omitted; the semi-synthetic metal cutting fluid is suitable for being widely popularized and applied in the field of the cutting fluid.

The invention discloses a high-yield levulinic acid ester preparation method under catalysis of solid acid and belongs to the field of organic synthesize. The method comprises the following steps: uniformly mixing 1 part of sugar, 10-100 parts of alcohol, 0.01-0.2 part of acid B and 0.1-1 part of acid L, and performing reaction under the temperature of 130-190 DEG C for 1-20 h to obtain a levulinic acid methyl ester solution, wherein the acid L is stanniferous molecular sieve, and the acid B is SBA-15-SO3H, Carbon-SO3H or Amberlyst-15. According to the method, the carbohydrate is low in cost and easy to obtain; with the acid B and acid L which can be used repeatedly, the catalysis effect basically remains the same; the levulinic acid ester compound prepared in one step can be widely applied to industries of food additives, essence spices, chemical reaction intermediates, gasoline, diesel-dopes and the like.

The invention discloses a method for synthesizing gamma-valerolactone through hydrogenation of methyl levulinate under the catalysis of a cobalt-based hydrogenation catalyst Co / ZrO2-Nb2O5. The catalyst has the advantages of high catalytic activity, good reusability, difficulty in loss of active components, easiness in separation from a liquid product and the like; when a mass ratio of the catalystto the reaction raw material methyl levulinate to the reaction solvent isopropanol is 0.2: 1: 20, a reaction temperature is 200 DEG C, and reaction time is 2 hours, the molar yield of the obtained hydrogenation product gamma-valerolactone is 98.32%, and the mass percent of the purity of the product is 99.01%.

The invention relates to a method for preparing methyl levulinate from biomass saccharide by using acidified montmorillonite as a catalyst, belonging to the technical field of organic synthesis. According to the method, biomass saccharide and methanol used as raw materials react in a reaction kettle at 160-220 DEG C for 2-5 hours by using sulfated montmorillonite or hydrogen-type montmorillonite as a solid acid catalyst to synthesize the methyl levulinate. The sulfated montmorillonite or hydrogen-type montmorillonite is prepared by the following steps: treating montmorillonite with sulfuric acid, filtering, washing with water, and calcining. The invention provides a new solid acid catalyst and new reaction route for converting biomass saccharide into methyl levulinate, and the methyl levulinate can be prepared by using the simple catalyst under mild conditions. The methyl levulinate can be widely used as an important platform compound in the biomass conversion process, and can be used as a food additive, essence, gasoline additive, biofuel or the like.

A synthesis method for 5-bromo-ethyl levulinate relates to a 5-aminolevulinic acid. Ethyl levulinate and liquid bromine are used as raw materials. The provided synthesis method for the 5-bromo-ethyl levulinate has the advantages of simplicity, wide raw material source, cheap raw materials, high yield and easiness in industrial production. The synthesis method comprises the following steps of: adding the ethyl levulinate raw material and a solvent into a reactor and reacting, and in the reaction process, adding the liquid bromine into the reactor to carry out bromination reaction; after the reaction is over, recycling the solvent in reaction liquid by a reduced pressure distillation method; dissolving distillation residues by water, adding diethyl ether for extraction, and obtaining a diethyl ether layer; washing the diethyl ether layer by a saturated sodium carbonate solution until the pH (Potential of Hydrogen) of the diethyl ether layer is neutral; drying and filtering by anhydrous magnesium sulfate, and recycling the diethyl ether through distillation so as to obtain a 5-bromo-ethyl levulinate crude product; and dissolving the 5-bromo-ethyl levulinate crude product in a mixed solvent of the diethyl ether and cyclohexane, and carrying out cooling crystallization in a cold trap to obtain the 5-bromo-ethyl levulinate.

The invention discloses a preparation method of methyl levulinate by ion liquid catalysis. The method is characterized in that furfuryl alcohol, glucose, sucrose and the like are used as raw materials; imidazole ion liquid and SnCl4.5H2O are used as catalysts; methanol is used as a raw material and a reaction medium; under the heating condition, a target compound is prepared. The method has the advantages that (1) the used raw materials are renewable resources and conform to the circulation economy development trends; (2) the sources of all raw and auxiliary materials are wide; the preparationis convenient; the cooperated effects of the catalyst are good; the raw material conversion rate is high; the product selectivity is high; (3) the preparation process has low requirements on equipment; the reaction is performed at the normal pressure; the post treatment is convenient; the method is a clean preparation method of the methyl levulinate, and is favorable for scaled industrial development.

The invention discloses a solid acid catalyst and an application thereof in catalytically converting glucose to prepare methyl levulinate. The carrier of the catalyst is sodium-based montmorillonite, the active ingredient of which is any one of In<3+>, Cr<3+>, Cu<2+>, Sn<4+> and Al<3+>. The loading capacity of the active ingredient is 5-40wt.%. The catalyst is prepared by using an ion exchange method, the preparation method is simple, and the solid acid catalyst is good in stability, environment-friendly, free of pollution and less in corrosion on equipment, and the catalyst for catalytically converting glucose to prepare methyl levulinate is good in catalytic activity, high in selectivity, easy to be separated and recovered from reactants, recyclable and good in cycling stability, and can be used for fully catalytically converting glucose. The highest yield of methyl levulinate can reach over 60%.

The invention discloses a technique for continuously preparing methyl levulinate by a furfural two-step process. The technique comprises the following steps: 1) filling an in-situ hydrogenation fixed-bed reactor with a supported non-noble metal catalyst, and filling an acid-catalyzed alcoholysis fixed-bed reactor with a solid acid catalyst; 2) dissolving furfural in isopropanol to form a homogeneous solution, pressurizing the solution through a measuring pump 1, preheating the solution through a preheater 1, continuously adding the solution into the in-situ hydrogenation fixed-bed reactor, and reacting; 3) separating the reaction solution by a rectification tower 1, mixing the furfuryl alcohol obtained on the tower bottom with methanol to form a homogeneous solution, pressurizing the solution through a measuring pump 2, preheating the solution through a preheater 2, continuously adding the solution into the acid-catalyzed alcoholysis fixed-bed reactor, and reacting; and 4) separating the reaction solution by a rectification tower 2, and obtaining the methyl levulinate product from the tower bottom. The technique implements continuous production on the methyl levulinate, has the advantages of high treatment capacity, stable long-time operation catalytic activity and high product yield, is suitable for large-scale industrial application, and has favorable industrialization application prospects.

The invention provides a method using furan to prepare methyl levulinate. The method includes: adding the furan, cation exchange resin 70 and a solvent into a reactor, heating to 140-180 DEG C within 10 minutes, and stirring for 1.8-2.2 hours at the stirring speed of 450-550rpm to obtain the methyl levulinate and levulinic acid, wherein the solvent is methylal or the mixed liquid of methylal and a cosolvent, and the cosolvent is methanol or water. The method has the advantages that the method uses the furan to prepare the methyl levulinate in one step, the methylal is the electrophilic reagent of electrophilic substitution reaction for converting intermediate product sugar alcohol, and the methanol serving as the cosolvent and the reactant plays an important role; the reaction process does not need hydrogenation, and the method is simple in reaction condition and capable of saving cost.

The invention relates to a method for preparing a high-efficiency composite alcohol-based fuel. Methanol, concentrated sulfuric acid and levulinic acid are sequentially poured into a reactor with a condensation recovery device, and the materials inside the reactor are heated to 65-70°C for 6-8 hours; The product inside the reaction kettle is subjected to an impurity removal process to obtain a premix containing methyl levulinate and methanol; the premix and veratrole are mixed and stirred evenly to obtain a finished product. The present invention utilizes levulinic acid and methanol to synthesize and convert into methyl levulinate, and then optimizes the impurity removal process of methyl levulinate, so that the impurity removal of methyl levulinate can be achieved without rectification means; compared to direct For burning methanol, the fuel evaporation rate of the complex alcohol-based fuel of the present invention is reduced by 67%. High fuel utilization rate and good combustion effect.

The invention discloses a one-pot method for preparing methyl levulinate by catalyzing furfural through a Zr-SBA-15 mesoporous molecular sieve in a near-critical methanol medium. The method comprises the following steps: (1) adding furfural and methanol into a high-temperature and high-pressure reaction kettle with a stirring function, and adding the Zr-SBA-15 mesoporous molecular sieve, wherein the Si / Zr molar ratio of the Zr-SBA-15 mesoporous molecular sieve is 5-100; (2) stirring, heating to 200-280 DEG C, and carrying out one-pot method reaction for 1-16 hours; and (3) after the reaction, cooling to the room temperature, filtering, distilling filtrate to obtain a methyl levulinate product, recycling methanol for later use, collecting filter residues, namely the Zr-SBA-15 mesoporous molecular sieve, washing with methanol, and drying and roasting for later use. The one-pot method has the beneficial effects that the process is simple, the process is environmentally friendly, and the cost is low and further has a good industrial production prospect.

The invention relates to a method for synthesizing 4-Methyloctanoic Acid. Firstly, an intermediate of 4-methyl-5-octanolide is obtained by grignard reaction of 4-Oxovaleric acid methyl ester with 1-bromobutyl-magnesium halide, the intermediate of 4-methyl-5-octanolide and calcium sulfate for dehydroxylation to generate 4-Methyl-Octenoic acid, and the 4-Methyl-Octenoic acid is catalytically hydrogenated to obtain the target product. Compared with prior art, the raw material of the method is easy to get, the method need not high-temperature and high pressure environment, the reaction condition is moderate, and the method reduces production cost and difficulty, simultaneously obtains high yield, and is suitable for industrial production.