52 results about "Methyl levulinate" patented technology

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.