531 results about "Methyl propionate" patented technology

An environmentally clean dual fuel for an internal combustion engine, comprising acetylene as a primary fuel and a combustible fuel, such as one or more fluids selected from an alcohol such as ethanol, methanol or any other alcohol or alcohols from the group comprising C1-C20 carbon chains, ethers such as from the group comprising dimethyl ether, diethyl ether, methyl t-butyl ether, ethyl t-butyl ether, t-amyl methyl ether, di-isopropyl ether and the like, low-molecular-weight esters such as from the group comprising methyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate and the like, or other suitable combustible fluid such as mineral spirits and the like, as a secondary fuel for operatively preventing early ignition and knock arising from the primary fuel. The dual fuel, internal combustion system, which generally utilizes a two-stage process for start-up and operation and can be operated with air- or liquid-cooling, is environmentally clean with hydrocarbon, CO, NOx, and SOx emissions substantially eliminated.

A process for preparing the benzotriazole as photostabilizer includes such steps as dissolving 2-nitro-2'-hydroxy-5'-methyl azobenzene and 2-nitro-2'-hydroxy-3'- tert-butyl-5'-methyl propionate azobenzene in the mixture of alcohol and alkali solution, adding hydrazine hydrate, heating, reflux reaction, using hydrochloric acid to neutralize the reaction liquid, depositing, filtering, water washing, drying to obtain an intermediate, dissolving it in the mixture of alcohol and alkali, adding sodium dithionate, stirring while reacting, adding ice water, neutralizing, filtering, drying, and recrystallizing in alcohol or isopropanol.

The invention discloses a method for synthesizing methyl propionate by ethylene. The methyl propionate is prepared from the materials: ethylene, methanol, carbon monoxide and water under existence of a catalyst in a carbonyl combination manner; and the adopted catalyst is a composite catalyst system taking palladium acetate as a main catalyst, and metal ions such as cobalt, nickel or ruthenium and the like as a promoter. The method disclosed by the invention has good catalytic activity and selectivity at a low temperature and low pressure; the composite catalyst system has the advantages of low consumption, good selectivity, long service life and the like; carbonyl synthesis of the methyl propionate from the ethylene can be efficiently catalyzed; the reaction result is based on the ethylene; the yield of the methyl propionate is greater than 95%; and the entire method has good commercial value.

There is provided in one embodiment of the invention an electrolyte for use in a lithium ion electrochemical cell. The electrolyte comprises a mixture of an ethylene carbonate (EC), an ethyl methyl carbonate (EMC), an ester cosolvent, and a lithium salt. The ester cosolvent comprises methyl propionate (MP), ethyl propionate (EP), methyl butyrate (MB), ethyl butyrate (EB), propyl butyrate (PB), or butyl butyrate (BB). The electrochemical cell operates in a temperature range of from about −60 degrees Celsius to about 60 degrees Celsius. In another embodiment there is provided a lithium ion electrochemical cell using the electrolyte of the invention.

This invention relates to dynamic lithium ion battery electrolyte and to one safe dynamic high capacity lithium ion electrolyte and discloses the following components: w/w carbonic acid esters agent composed of vinylene carbonate less than 40 percentage; propylene carbonate less than 20 percentage; methyl propionate less than 40 percentage; propylene carbonate less than 40 percentage; lithium salt 10-16 percentage to prevent additive agent phenylcyclohexyl, p-methyl peroxide, phthalandione or fluoride content less than 12 percentage or combustion inhibitor less than 10 percentage and film addictive agent less than 5 percentage.

The invention relates to a synthetic improvement method of acryloylmorpholine, and belongs to the field of organic synthesis. The method comprises the following steps: performing Michael addition on diethylamine and methyl acrylate which are taken as raw materials so as to generate 3-methoxy-diethyl methyl propionate; then performing an amidation reaction by adding morpholine so as to generate 3-morpholinyl-diethyl propionamide; and finally performing a catalytic cracking reaction so as to obtain a target product, namely, the acryloylmorpholine. The method is simple and short in process, easy in raw material obtainment, simple in equipment, easy in reaction condition control, moderate in preparation condition and simple in purification refining process. The acryloylmorpholine is stable, easy to separate and is difficult to polymerize.

The invention discloses a water resistant catalyst for aldol condensation. The water resistant catalyst comprises a main active ingredient, an active agent and a carrier, wherein the main active ingredient is one or more selected from oxides or salts of Cs; the active agent is one or more selected from oxides or salts of Sb, Nb, Ag, Al and Zr; the carrier comprises SiO2 and a carrier aid; the carrier aid is one or more selected from Al2O3, ZrO2, diatomite and kaolin; the SiO2 is hydrophobic nano SiO2; or (2) the catalyst is subjected to water-resistant treatment. The water resistant catalyst is used for aldol condensation, has the characteristics of high activity, high selectivity and long service life, is especially used for synthesizing methyl methacrylate through formaldehyde and methyl propionate. With calculation of methyl propionate, the selectivity of methyl methacrylate is 94 percent, and the single service life of the catalyst is over 400 hours. The catalyst is simple in preparation method and is suitable for industrial application.

The invention discloses a preparation method of a hindered phenol antioxidant. The method comprises the steps of uniformly mixing 3-methyl-5-tertiary butyl-4-methyl hydroxyphenylpropionate or 3-(3,5-tert butyl-4-hydroxy phenyl) methyl propionate and corresponding alcohol or amine evenly under agitation, carrying out heating, decompression and light fraction removal, adding a catalyst and carrying out heating and decompression for transesterification; infiltrating reaction liquid into a scraper evaporator after reaction is completed or carrying out flash evaporation in short-range distillation equipment and evaporating unreacted 3-methyl-5-tertiary butyl-4-methyl hydroxyphenylpropionate or 3-(3,5-tert butyl-4-hydroxy phenyl) methyl propionate; and cooling and adding acid, carrying out heat preservation and neutralization, filtering out the catalyst through hot filtration, carrying out crystallization and drying to obtain a target product antioxidant. Compared with a traditional method, the preparation method has the advantages of being simple and convenient in operation, the material loss and energy consumption in recovery of 345 ester or 35 methyl ester are reduced, the problems of three wastes in a traditional recovery process is solved, and meanwhile, the yield and quality of the target antioxidant are improved.

An environmentally clean dual fuel for use in an internal combustion engine, comprising acetylene as a primary fuel and a combustible fuel, such as one or more fluids selected from an alcohol such as ethanol, methanol or any other alcohol or alcohols from the group comprising C₁-C₂₀ carbon chains, ethers such as from the group comprising dimethyl ether, diethyl ether, methyl t-butyl ether, ethyl t-butyl ether, t-amyl methyl ether, di-isopropyl ether and the like, low-molecular-weight esters such as from the group comprising methyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, ethyl malate, and butyl malate, and the like, or other suitable combustible fluid such as mineral spirits and the like, as a secondary fuel for operatively preventing early ignition and knock arising from the primary fuel.

The present invention relates to a methyl propionate preparation method, which comprises: mixing methanol and a ruthenium-supported metal oxide catalyst, placing the obtained mixture in a pressure container, filling with ethylene and carbon monoxide, sealing, and stirring, wherein the reaction temperature is more than or equal to 130 DEG C, the reaction time is more than or equal to 2 h, and the ruthenium-supported metal oxide catalyst is one or a plurality of material selected from Ru/TiO2, Ru/Nb2O5, Ru/CeO2 and Ru/Al2O3. According to the present invention, with the method, the catalyst is easily separated from the reaction system after the reaction, and can be used repeatedly, and the yield of propyl formate is up to 90%.

The present invention relates to a new process for the synthesis of racemic and optically active bicalutamide starting from ethyl pyruvate and methyl methacrylate. The present invention discloses processes of preparing bicalutamide intermediates including ethyl-[2-{4-fluorophenyl sulfone}]-2-hydroxy propionate, 1,2-epoxy-2-methyl propionate and 2-hydrox-2-methyl-3-(4-fluorophenylthio) propionic acid. The present invention further discloses micronized rac-bicalutamide and the preparation thereof. The present invention further discloses a new process for the isolation and purification of racemic and optically active bicalutamide.

The invention discloses a catalysis system for synthesizing methyl propionate and an application method thereof. The catalysis system is prepared from a ruthenium-cluster carbonyl complex, imidazoliumionic liquid and an inorganic salt accelerator, or the ruthenium-cluster carbonyl complex and the imidazolium ionic liquid, wherein the mole ratio of the imidazolium ionic liquid to the ruthenium-cluster carbonyl complex is (100-250):1; when the catalysis system comprises the accelerator, the mole ratio of the accelerator to the ruthenium-cluster carbonyl complex is (1-75):1; the accelerator is carbonate, halogenated lithium or transitional metallic chloride. The system uses the imidazolium ionic liquid to consume water produced in the reaction to accelerate the reaction to be performed towards the forward direction; by the adding of the inorganic salt accelerator, the catalytic activity is further improved, so as to catalyze ethylene, CO2 and methanol to prepare the methyl propionate. The catalysis system obviously shortens the reaction time, so that the yield of the methyl propionate is increased.

The invention discloses a method for preparing methyl levulinate through the clean conversion of biomass sugar and separating methyl levulinate. The method comprises the following steps: 1, calcinating a solid acid at 300-700DEG C for 1-5h; 2, adding a biomass sugar methanol solution with the mass concentration of 10-200g/L and the solid acid to a high pressure reactor to obtain a mixed solution; 3, heating the mixed solution to 180-220DEG C, and keeping the temperature for 1-5h; 4, cooling to room temperature, and separating a solid catalyst from a liquid product by filtering; 5, carrying out normal pressure distillation on the liquid product to remove low boiling point substances to obtain a residue; and 6, adding a distillation assistant to the residue, and carrying out reduced pressure distillation to obtain methyl levulinate. The method of the invention, which adopts the clean solid super acid to catalyze the conversion of the biomass sugar into methyl levulinate and has the advantages of no corrosion to equipment, easy separation of the catalyst from the product, environment protection and the like, accords with the greening development trend of the current chemical industry.

The invention provides a method for preparing methyl methacrylate by aldol condensation of methyl acetate and formaldehyde, and belongs to the technical field of preparation of methyl methacrylate. The method comprises the following steps: preheating methyl acetate, returned methyl propionate, a formaldehyde source, methanol, water and oxygen-containing fluidized gas as materials, enabling the materials to enter a fluidized-bed reactor, under the action of a catalyst bed material in an internal-circulation fluidized bed, generating aldol condensation reaction to produce MMA, and finishing regeneration of a catalyst. The method provided by the invention has the beneficial effects that by utilization of the characteristic of internal-circulation movement of the fluidized-bed material, a little amount of oxygen is introduced at the lower part of the fluidized bed to form a local oxygen-containing area to carry out periodical regeneration on the catalyst bed material, so that the serious side reaction in the presence of a large amount of oxygen and insufficient and non-uniform regeneration of the fluidized-bed material are avoided, regeneration of the catalyst in the aldol condensationreaction is realized, the catalyst can maintain high activity for a long term, and the catalyst utilization efficiency is improved; the problems of inactivation and short service life of a catalyst due to easy carbon deposition in the aldol condensation process of the methyl acetate, the methyl propionate and the formaldehyde are solved.

The invention discloses an intermittent extractive distillation separation method of methanol-methyl propionate azeotropic mixtures, which belongs to the separation technology of the methanol-methyl propionate azeotropic mixtures and includes: ethylene glycol, 1,2-propylene glycol, glycerol, anisole and toluene or chlorobenzene are used as extracting agents, under operation conditions of an extracting rectifying tower, mass ratio of the extracting agents and overhead distillate is 0.5:1-10:1at ordinary pressure or reduced pressure, feeding temperature of the extracting agents is 20-60 DEG C, different temperatures and different reflux ratios at the top of the extracting rectifying tower are controlled, methanol products, a methanol-methyl propionate transition section I, methyl propionate products and a methyl propionate-extracting agent transition section II are respectively picked out through the extracting rectifying tower, and when extracting agent components of a heating kettle meet requirements, the extracting agents are pumped into a high-level storage groove and materials are fed for the next intermittent extractive distillation separation. The intermittent extractive distillation separation method has the advantages that the single tower is low in device cost and flexible in operation, and the extracting agents are adopted to damage a methanol-methyl propionate azeotropic system to separate out high-purity methanol products and high-purity methyl propionate products.