151results about "Preparation by aldehyde oxidation-reduction" patented technology

The present invention relates to a method of producing methanol from a methane source by oxidizing methane under conditions sufficient to a mixture of methanol and formaldehyde while minimizing the formation of formic acid and carbon dioxide. The oxidation step is followed by treatment step in which formaldehyde is converted into methanol and formic acid which itself can further be converted into methanol via catalytic hydrogenation of intermediately formed methyl formate.

Disclosed is a composite particle-loaded article which contains composite particles composed of nickel in an oxidized state and a substance X (X represents at least one element selected from the group consisting of nickel, palladium, platinum, ruthenium, gold, silver and copper), and a carrier on which the composite particles are loaded. The composite particle-loaded article has a loaded layer in which the composite particles are localized.

A process for preparing an alpha, omega-dicarboxylic acid or an ester thereof, which includes (a) subjecting at least one unsaturated fatty acid or fatty acid derivative to ozonolysis to obtain an ozonolysis reaction mixture; and (b) oxidizing the ozonolysis reaction mixture with an oxidizing agent in the presence of an acid catalyst to obtain an oxidized reaction mixture comprising at least one alpha, omega-dicarboxylic acid or ester; wherein the process is performed using a solvent and the acid catalyst has a pKa of less than or equal to zero, as measured at 25° C.

Disclosed is a catalyst for use in production of carboxylic acid ester by reacting (a) aldehyde and alcohol, or (b) one or more types of alcohols, in the presence of oxygen; wherein oxidized nickel and X (wherein X represents at least one element selected from the group consisting of nickel, palladium, platinum, ruthenium, gold, silver and copper) are loaded onto a support within the range of the atomic ratio of Ni/(Ni+X) of from 0.20 to 0.99.

The invention discloses a method for preparing 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, which relates to the technical field of organic synthesis. In the invention, isobutylaldehyde is used as a raw material, aldol condensation and Cannizzaro reactions are completed by a one-step reaction process in the presence of a catalyst, and the process adopts sodium alcoholate as the catalyst; and the isobutylaldehyde is used to form alcohol ester-12 in the presence of the sodium alcoholate catalyst, so the complex and high-energy consumption drawbacks of a two-step reaction process using an inorganic alkali as a catalyst are overcome, the drawbacks of toxic catalyst and high quality requirement on the isobutylaldehyde raw material of a one-step reaction process using Ba(OH)2 as a catalyst are overcome, and simple process, high single-pass yield, small catalyst dosage, low energy consumption, safety and environmental protection are realized.

The invention provides an environmental-friendly method for preparing 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, which comprises a condensation reaction and a Tishchenko reaction of isobutyraldehyde, wherein condensation products of the isobutyraldehyde are subjected to the Tishchenko reaction under the catalytic action of tert-butoxy anion-pillared layered magnesium-aluminum anionic clay to generate 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate. The preparation method has the advantages of high single-pass yield, high selectivity of target products, a few by-products, mild reaction conditions, catalyst recycling and environmental-friendly synthetic process.

Production of 2,2,4-trimethyl-1,3-pentanediol monoester isobutyrate is carried out by condensation pre-treating isobutyl aldehyde, and Knigcharlo reacting in molecule under the action of hydrotalcite-like solid catalyst to obtain the final product. It has high single-pass recovery rate, gentle reactive condition and no corrosion.

The invention discloses a preparation method for a catalyst for producing methyl methacrylate. The preparation method comprises the following steps: fully mixing a gold precursor with a reducing agentand deionized water under stirring by adopting a a macromolecular protection method, so as to obtain stable and uniformly single gold sol in a higher dispersion state; sequentially adding a lanthanide metal and a transition metal in the presence of a macromolecular protection agent, then adding a carrier, continuously stirring for 2 to 20 hours, slowly heating the mixture to 65 to 85 DEG C, cooling the product to room temperature after the stirring is ended, leaving to stand for filtration, washing the product with the deionized water till no chloride ions are detected, drying the product, and calcining the product in air to obtain the catalyst. The catalyst has outstanding performance in the reaction for producing the methyl methacrylate. According to the preparation method, the gold carrying amount is low; the preparation process is simple and easy to operate; the catalyst is excellent in activity, extremely high in stability and low in cost; the methylacrolein conversion rate and the MMA (methyl methacrylate) selectivity are high; the preparation method is suitable for industrial production.

The invention discloses a method for preparing 2,2,4-trimethyl-1,3-pentanediol single-isobutyrate, which comprises the step of performing an intra-molecular Cannizzaro reaction on an aldol condensation product, which is prepared from isobutyraldehyde at a low temperature, under the action of a catalyst to synthesize the 2,2,4-trimethyl-1,3-pentanediol single-isobutyrate, wherein the catalyst is ametallic oxide heterogeneous catalyst modified by KF, K2CO3 or KOAc which is used as an active center base. The catalyst in the method is simple and easy to prepare, is easy to separate and reclaim and has small corrosion to equipment; and the method is simple to operate and has a mild reaction condition.

The invention discloses a method for preparation of methyl formate. The method comprises the following steps: conducting a Tishchenko reaction on formaldehyde gas or mixed gas containing formaldehyde gas in a reactor to obtain the methyl formate after the reaction. The method can efficiently convert methanol or dimethyl ether for synthesis of methyl formate, and the yield of methyl formate can reach more than 90%. The method employs cheap catalyst and simple equipment, can be applied to the current common industrial production conditions, and has good application prospect.

The invention discloses an alcohol ester-12 production process which includes the steps: condensing isobutyraldehyde under alkaline conditions to generate 2,2,4-trimethyl-3-hydroxyl-1-valeraldehyde; continuing to perform polycondensation reaction on the isobutyraldehyde and the 2,2,4-trimethyl-3-hydroxyl-1-valeraldehyde generated by reaction to generate the alcohol ester-12. The production processhas the advantages that the process is continuous and simple, convenient to operate, small in occupied area and leas in investment, and products prepared by the process are stable. The alcohol ester-12 prepared by the method is a dihydric alcohol ester solvent with high boiling point and poly-functional groups, a novel environmental-friendly green chemical and mainly used for special coalescing agents of waterborne architectural coatings, and the waterborne architectural coatings made of the coalescing agents cannot emit substances toxic for people into an atmospheric environment.

Provided are a plasticizer composition including a hydroxypivalyl hydroxypivalate ester and a neopentylglycol ester, and a method of preparing the plasticizer composition. The plasticizer composition provides a polyvinyl chloride resin having excellent properties of heat loss, migration resistance and plasticization efficiency, and tensile strength, elongation, etc.

The present invention relates to novel catalysts for oxidative esterification, by means of which, for example, (meth)acrolein can be converted to methyl (meth)acrylate. The catalysts of the invention are especially notable for high mechanical and chemical stability even over very long periods. This especially relates to an improvement in the catalyst service life, activity and selectivity over prior art catalysts which lose activity and/or selectivity relatively quickly in continuous operation in media having even a small water content.

Catalysts for oxidative esterification can be used, for example, fro converting (meth)acrolein to methyl (meth)acrylate. The catalysts are especially notable for high mechanical and chemical stability even over very long time periods, including activity and/or selectivity relatively in continuous operation in media having even a small water content.

The invention provides a solid catalyst used for preparing methyl methacrylate, and relates to a solid catalyst, in particular to a solid catalyst which takes oxides of palladium, plumbum and metal as the main components and is mainly used for preparing methyl methacrylate by further oxidizing and esterifying methylacrolein. The invention provides a solid catalyst used for preparing methyl methacrylate. The components and compounding ratio are Alpha-Pd-Beta-Pb-Gamma-M/carrier, wherein, Pd is palladium, Pb is plumbum, and M is Fe or Bi; Alpha, Beta and Gamma respectively represents the mass percentage of each component in the catalyst, Alpha equals 4% - 7%, Beta equals 1% - 3.5%, Gamma equals 0% - 3%, and the rest is the carrier, which is at least one of MgO, ZnO orCo2O3.

A process for forming methyl methacrylate can comprise: reacting ethylene, carbon monoxide, and hydrogen, in the presence of a first catalyst comprising a metal carbonyl; removing a first reaction product comprising propionaldehyde; reacting the first reaction product with formaldehyde; removing a second reaction product comprising methacrolein; reacting the second reaction product with oxygen and methanol in the presence of a second catalyst to form a third reaction product comprising methyl methacrylate. Another process for forming methyl methacrylate can comprising: reacting ethylene with carbon monoxide to form propionaldehyde; reacting the propionaldehyde with formaldehyde to form methacrolein; and reacting the methacrolein with methanol and oxygen to form the methyl methacrylate.

The invention provides a single step process for synthesizing esters, wherein esters are synthesized from aldehydes in one step at the presence of alkoxy aluminium catalyst and waterless zinc chloride catalyst promoter. Compared with the conventional alcohol acid esterification method, the invention realizes high yield, low moisture content in synthesized product, and readily releasable high purity esters.

The invention relates to a catalyst for preparing n-Butyl butyrate by n-butanal and a preparation method thereof. The catalyst is prepared by the following steps: using a hydroxy-enriched porous organic polymer as a substrate, and forming a complexation structure of Ru on the surface of the substrate; firstly preparing a hydroxy-enriched porous organic polymer material POP; adding tert-butyl lithium or n-butyl lithium, and preparing a polymer POP-Li; and adding ruthenium salt to obtain a polymer POP-Ru. The catalyst has the characteristics of good stability, repeated use, and higher reaction conversion rate and selectivity. The preparation method is capable of creatively fixing Ru ions on the surface of the catalyst, a new idea is provided for the preparation of the catalyst, and the catalyst has the significant application value.

The invention discloses a continuous production method for 2,2,4-trimethyl-1,3-pentanediol isobutyrate. A two-step method fixed bed continuous reaction process and a solid catalyst are adopted, wherein the catalyst is a solid catalyst Cs-K/SiO2 which is prepared by taking spherical silicon oxide as a carrier to carry caesium-potassium double-alkali metal active components. The method comprises the following steps: adopting two serial tubular type fixed bed reactors, firstly feeding a preheated isobutyraldehyde raw material into a first tubular type fixed bed reactor for an aldol condensation reaction, subsequently feeding an obtained an aldol condensation product into a second tubular type fixed bed reactor for intramolecular Cannizzaro reaction, and continuously reacting so as to obtain a target product. Due to adoption of a two-step method fixed bed continuous reaction process, the method is not only high in isobutyraldehyde conversion rate and product selectivity, but also high in production efficiency, simple in reaction operation, beneficial for energy conservation and discharge reduction and has a large-scale continuous industrial production prospect.

The invention relates to a new method for preparing low-carbon ester by condensation of low-carbon aldehyde through catalysis of acetylacetone metal salts. The method is characterized in that the acetylacetone metal salts are taken as a catalyst, the low-carbon ester is prepared by performing a reaction for 2-4 h under the conditions that the mass ratio of aldehyde to the catalyst is (10:1) to (200:1), the mass ratio of the aldehyde to a solvent is (1:1) to (10:1), the reaction temperature is 80 to 250 DEG C, and the reaction pressure of 0.1 to 1.0 MPa, and the catalyst is recovered and recycled. Compared with the prior art, the defects that a traditional catalyst is not easy to separate, is liable to inactivate, cannot be recycled, and the like are solved; the dosage of the catalyst is less, the yield is high, no waste water is generated basically during production, and a green synthesis process can be realized.