50results about "Oxygen compounds preparation by alkyne addition" patented technology

PCT No. PCT/EP96/00163 Sec. 371 Date Oct. 15, 1997 Sec. 102(e) Date Oct. 15, 1997 PCT Filed Jan. 17, 1996 PCT Pub. No. WO96/22265 PCT Pub. Date Jul. 25, 1996A dilute ethylene stream, e.g., one produced by steam cracking, is oxonated to yield propanal, without the need to separate other lower hydrocarbons.

A process for preparing functional group-containing olefinic compounds comprises the steps of (a) reacting at least one alkylidene phosphorane with at least one carbonyl-containing compound that comprises at least one group that is a leaving group, or that is capable of subsequent conversion to a leaving group, to form an olefinic compound that comprises at least one leaving group, the carbonyl-containing compound being selected from the group consisting of ketones and aldehydes; and (b) reacting the olefinic compound with at least one functional group-containing nucleophile to form a functional group-containing olefinic compound.

The present invention provides processes for selectively producing ethanol from syngas. In some variations, the process comprises converting biomass-derived syngas to dimethyl ether, carbonylating the dimethyl ether to methyl acetate, hydrogenating the methyl acetate to methanol and ethanol, and recovering the ethanol product. The methanol is preferably recycled by converting to hydrogen and carbon monoxide for introduction back into the process at distinct points. In certain variations of this invention, fresh syngas feed is introduced downstream of the first unit operation in the sequence. High yields of ethanol from biomass can be achieved according to the disclosed processes.

A process for preparing an epoxidation catalyst comprising silver and a high-selectivity dopant on a support, which process comprises

• • depositing a base having a pK_b of at most 3.5 when measured in water at 25° C., on the support prior to depositing silver on the support, and depositing silver and a high-selectivity dopant on the support; the epoxidation catalyst; and a process for preparing an olefin oxide by reacting an olefin with oxygen in the presence of the epoxidation catalyst.

This invention relates to an improvement in a liquid phase process for producing isopropanol by the hydrogenation of acetone in the presence of a hydrogenation catalyst; the improvement comprising;

• • contacting acetone with hydrogen under continuous liquid phase conditions; and,
  • employing a sponge metal catalyst promoted with an effective amount of chromium.

A process for the hydrogenation, using molecular hydrogen (H2), of a catalytic system, wherein the catalytic system comprises a base and a complex of formula; (II) wherein Y represents simultaneously or independently a hydrogen or halogen atom, a hydroxy group, or an alkoxy, carboxyl or other anionic radical, and N2P2 is a tetradentate diimine-diphosphino ligand.

The invention relates to a method for producing Guerbet alcohols of formula (I), CH3(CH2)nCHR<1>CH2OH, wherein R<1 >represents a linear alkyl radical having n-1 carbon atoms, and n represents 3 to 9 carbon atoms. Fatty alcohols of formula (II), R<2>OH, wherein R<2 >represents linear alkyl radicals having 6 to 12 carbon atoms, are condensed in the presence of carbonyl compounds and alkali hydroxides.

The invention relates to the production of isopropyl alcohol from di-isopropyl ether by catalytic distillation. The process solves, in particular, problems associated with the Sulfuric Acid Process.

Hydrocarbons are oxidized to ethylene and/or oxygenates that comprise acetic acid. The acetic acid may be converted to ethanol by hydrogenation. The ethylene may be converted to ethanol by hydration.

This invention comprises a process for hydrogenation of aldehydes to alcohols using novel homogeneous catalysts. The catalysts are generated in situ under hydrogen and carbon monoxide gases in a suitable solvent, by mixing a rhodium catalyst precursor, such as Rh(CO)₂ acetoacetonate and a defined ligand.

A supported silver catalyst and use thereof in a process for producing an alkylene oxide, such as ethylene oxide, by the direct oxidation of an alkylene with oxygen or an oxygen-containing gas, wherein the catalyst provides improved stability and improved resilience to reactor upsets and timely recovery to substantially pre-upset levels of catalyst activity and/or efficiency. In some embodiments, the catalyst also exhibits improved activity. A catalyst capable of producing ethylene oxide at a selectivity of at least 87 percent while achieving a work rate of at least 184 kg/h/m³ at a temperature of no greater than 235° C. when operated in a process where the inlet feed to a reactor containing the catalyst comprises ethylene, oxygen, and carbon dioxide, wherein the concentration of carbon dioxide in the inlet feed is greater than or equal to 2 mole percent.

A method of producing an o-disubstituted aromatic compound, containing: continuously conducting at least the following steps (a) to (d):

(a) a step of mono-lithiating one halogen atom of an o-dihaloaromatic compound, using a first microreactor;

(b) a step of making the thus-obtained monolithiated product to react with an electrophilic compound, using a second microreactor, to obtain a monosubstituted-monohaloaromatic compound;

(c) a step of lithiating the other halogen atom of the o-dihaloaromatic compound, using a third microreactor; and

(d) a step of making the thus-obtained lithiated product successively to react with an electrophilic compound, using a forth microreactor.

The present invention discloses no-catalyst ferulaaldehyde hydrolyzing process to prepare vanillin in near critical water medium. The process includes the following steps: 1. adding deionized water and ferulaaldehyde in the mass ratio of 1-6 into a high pressure reactor, heating at normal pressure and while stirring to boil, and opening the exhaust valve for 2-5 min; 2 further heating to 200-320 deg.c for hydrolysis for 0.5-8 hr; 3 cooling the hydrolysate, separating into water phase and organic phase, extracting the water phase with organic solvent and distilling the extracted phase before merging with the organic phase; 4 decompression distilling the merged organic phase to obtain crude vanillin product, crystallizing in toluene and re-crystallizing in ethanol to obtain high purity vanillin product. The process is simple, high in yield and environment friendly, and the obtained vanillin product has high quality.

Alkyl-substituted butenols having the formula (I):

R¹—CH₂—CH═CR²—CH₂OH   (I)

wherein R¹ is a saturated or olefinically unsaturated alkyl or cycloalkyl group having from 4 to 16 carbon atoms and wherein R¹ is optionally substituted by an alkyl, cycloalkyl, aryl or alkaryl having up to 12 carbon atoms; R² is hydrogen or an alkyl group having from 1 to about 6 carbon atoms are produced by a process which comprises: (1) reacting an aldehyde of the formula (II):

R¹—CH₂—CHO   (II)

wherein R¹ has the same meaning as in formula (I), with the corresponding lower aldehyde to form an unsaturated aldehyde in an inert organic solvent; (2) continuously contacting an optionally calcined copper/zinc catalyst with the unsaturated aldehyde under isothermal conditions at temperatures of from about 45 to about 60° C. and under a hydrogen pressure of from 1 to about 300 bar.

Disclosed is a composition, a method of making and a method of using critical clusters for asymmetric synthesis using substantially optically-pure chiral solvent molecules in a supercritical fluid. The solvent molecules are capable of forming a multipoint hydrogen bonded solvate as they encage at least one solute molecule. The encaged solute molecule is capable of reacting to form an optically active chiral center. In another aspect, there is disclosed a method of directing the position of bonding between a solute molecule and a ligand involving encaging the solute molecule and the ligand with polar solvent molecules in a supercritical fluid under conditions of temperature and pressure sufficient to change electric charge distribution in the solute molecule. In yet another aspect, disclosed is a method of making pharmaceutical compounds involving encaging a solute molecule, which is capable of forming a chiral center, and a ligand with polar solvent molecules in a supercritical fluid under conditions of temperature and pressure sufficient to change electric charge distribution of the solute molecule. The solute molecule and ligand are then reacted whereby the ligand bonds to the solute molecule forming a chiral center. Also disclosed is a method for racemic resolution using critical clusters involving encaging racemic mixtures of solute molecules with substantially optically-pure chiral solvent molecules in a supercritical fluid under conditions of temperature and pressure sufficient to form critical clusters. The solvent molecules are capable of multipoint hydrogen bonding with the solute molecules. The encaged solute molecules are then nonenzymatically reacted to enhance the optical purity of the solute molecules.

The invention discloses a vanadium doped mesoporous nanometer SiO2 particle catalyst used for ethane and propane selective oxidation, and a preparation method thereof, and belongs to the technical field of heterogeneous catalysis. Mesoporous nanometer SiO2 particle is taken as a carrier of the catalyst, vanadium is taken as an active component, vanadium oxides are doped into the mesoporous nanometer SiO2 particle skeleton. The preparation method is simple; the specific surface area is large; the channel structure is abundant; in preparation, one-step synthesis method is adopted, and in-suit doping of the active component vanadium is carried out; the preparation method is simple; preparation cycle is short; the structure of the catalyst active component obtained via one-step synthesis method is more stable; the catalyst possesses excellent ethane, propane selective oxidation performance, is high in ethane propane conversion rate, and high in product selectivity.

The invention relates to a composition of matter comprising at least one metal from Group 3, at least one metal from Group 4, sulfur and oxygen, particularly useful as a catalyst for ether decomposition to alkanols and alkenes.

In one embodiment, the invention is to a process for producing ethanol. The process comprises the step of hydrogenating an acetic acid feed stream in a first reactor to form a crude ethanol product. The crude ethanol product may comprise, among other components, ethanol, acetaldehyde, and residual acetic acid. The process further comprises the step of recovering acetaldehyde from the crude ethanol product. The process further comprises the steps of feeding a first portion of the recovered acetaldehyde to the first reactor and reacting the first portion of the recovered acetaldehyde in the first reactor to form additional ethanol. In addition, the inventive process may comprise the steps of feeding a second portion of the recovered acetaldehyde to a second reactor and reacting the second portion of the recovered acetaldehyde in the second reactor to faun an additional product.