9 results about "Isobutyraldehyde" patented technology

This invention belongs to the field of homogeneous catalysis technology, and particularly relates to a method for the hydroformylation of propylene to prepare isobutyraldehyde. The method includes: in the presence of a bidentate P-N ligand and a rhodium metal compound, introducing propylene and syngas to carry out a hydroformylation reaction to prepare isobutyraldehyde. The structural formula of the bidentate P-N ligand is as follows: [Insert structural formula here]. Wherein, R1 is selected from one of C2-C4 alkyl groups, substituted or unsubstituted phenyl groups; R2 is selected from one of hydrogen, C1-C4 alkyl groups, alkoxy groups, substituted or unsubstituted phenyl groups. This method provides a highly active P-N ligand, which, while reducing the amount of rhodium catalyst, maintains high activity and can significantly improve the conversion rate of propylene, as well as the selectivity and yield of isobutyraldehyde.

The invention discloses a method for preparing isobutyraldehyde by catalyzing methanol and ethanol through a composite metal oxide catalyst, and particularly relates to a method for preparing isobutyraldehyde by catalyzing methanol and ethanol through an aldol condensation reaction by taking V2O5 as a main metal oxide catalyst. The introduced metal oxides comprise one or more of TiO2, Al2O3, ZrO2, SiO2, La2O3 and Nb2O5, and the composite metal oxide catalyst mainly containing V2O5 is prepared by one or more methods of mechanical grinding and is used for preparing isobutyraldehyde from methanol / ethanol. The method has the advantages that the metal oxide is introduced to optimize the oxygen supply activity and restore the oxidation capacity of the vanadium catalyst, so that the product selectivity is improved.

The present application relates to a method for separating high-purity n-butyl aldehyde from mixed butyl aldehyde of carbonyl synthesis product, comprising the following steps: adding reaction inhibitor to the product of carbonyl synthesis reaction after separating catalyst, part of which enters high-pressure rectifying column, and the other part enters low-pressure rectifying column, n-butyl aldehyde product is obtained from the side line of high-pressure rectifying column and the bottom of low-pressure rectifying column, and iso-butyl aldehyde product is obtained from the top of high / low-pressure column. The present application adds reaction inhibitor to improve product purity, solves the problem of easy polymerization of mixed butyl aldehyde by using the characteristics of low-temperature decomposition of butyl aldehyde trimer, separates high-purity n-iso-butyl aldehyde from mixed butyl aldehyde with low energy consumption, and has low equipment investment cost and can create high economic benefits.

This invention relates to a method for preparing methyl isopentyl ketone, comprising the following steps: acetone and isobutyraldehyde are mixed and passed through a fixed-bed reaction section packed with a layered metal oxide condensation catalyst; acetone and isobutyraldehyde are recovered by distillation for reuse; the condensation product enters a fixed-bed hydrogenation section, where it reacts with hydrogen under the action of a hydrogenation catalyst to obtain methyl isopentyl ketone. This invention separates the key reaction steps of condensation and hydrogenation. Firstly, the condensation catalyst designed based on the aldehyde-ketone condensation mechanism has higher condensation selectivity, forming the MIAK hydrogenation precursor, thus avoiding the self-condensation reaction of acetone and isobutyraldehyde and also avoiding the conversion of acetone to alcohol.

The application discloses coffee essence, atomized liquid and electronic atomization device, and belongs to the field of electronic atomizers. The coffee essence comprises 2-acetylpyrrole, vanillin, methylcyclopentenolone, maltol, furfuryl acetate, guaiacol, isopentyl alcohol propylene glycol solution, furfuryl mercaptan, 2-ethyl-3,5-dimethylpyrazine, isovaleric acid propylene glycol solution, 2,3,5-trimethylpyrazine, isobutyraldehyde, 2-methyl-3-(methylthio)pyrazine, isoamyl aldehyde, trigonellin, 4-hydroxy-2,5-dimethyl-3(2H)-furanone, 5-methylfurfural, dimethyl sulfide, 2-acetylfuran, 5-hydroxyethyl-4-methylthiazole, 2-acetylpyrazine, 4-ethylguaiacol, acetic acid, propionic acid, acetaldehyde propylene glycol solution, 4-methyl-5-(2-acetyloxyethyl)-thiazole and propylene glycol. The coffee essence has good stability, good compatibility and can accurately restore the real coffee roasting aroma.

This invention belongs to the fields of chemical material synthesis and biomedicine, and provides a method for synthesizing α-ketovaline calcium. This method uses environmentally friendly and low-cost diethyl oxalate as a raw material. The pKa value is precisely controlled through a mixed alkali system to suppress the self-condensation side reaction of isobutyraldehyde. After the condensation reaction at 55-60℃, formic acid is generated through alkaline degradation. Byproducts are completely removed using a 1:1 redox reaction of 30% hydrogen peroxide and formic acid, replacing the traditional high-energy-consuming distillation process. The product yield reaches 78.1%, and the purity is ≥99.8%, demonstrating significant advantages in terms of economy, environmental friendliness, and industrial feasibility.

This invention provides a coffee flavoring and its preparation method, comprising 0.1 parts of furanone, 2-acetylpyrazine, vanillin, ethanol, 3-methylthiopropional, 2-methoxy-4-vinylphenol, 2-ethyl-3-methylpyrazine, 2-ethyl-3,5-dimethylpyrazine, furfuryl mercaptan, β-damascone, p-cresol, hexanoic acid, 2-methylbutyric acid, 2,3-pentanedione, methyl furfuryl disulfide, 3-mercapto-3-methylbutyl formate, terpineol, 1-octen-3-ol, isobutyraldehyde, furfural, 5-methylfurfural, isovaleraldehyde, linalool, 2-methoxy-3-isobutylpyrazine, phenylacetaldehyde, eugenol, 2,3,5-trimethylpyridinium, guaiacol, 4-ethylguaiacol, an amino acid composition, glycerol, water, and coffee extract. The coffee flavoring of this invention has a strong three-dimensional aroma, rich layers, and high overall aroma realism and harmony.

A process comprises a) subjecting propylene to hydroformylation in the presence of a homogeneous hydroformylation catalyst in a hydroformylation reactor to form a reaction liquid; b) withdrawing a hydroformylation effluent stream from the hydroformylation reactor; c) separating the hydroformylation effluent stream into a raw hydroformylation product stream and a reactor return stream comprising the homogeneous hydroformylation catalyst; and returning the reactor return stream to the hydroformylation reactor; and d) subjecting the raw hydroformylation product stream to work-up to obtain a mixed butyraldehyde stream; and rectifying the mixed butyraldehyde stream in a distillation column so as to obtain an n-butyraldehyde stream and an isobutyraldehyde stream. The process comprises withdrawing a stream of reaction liquid from the hydroformylation reactor, circulating the reaction liquid stream through a cooling loop including at least one heat exchanger, wherein the reaction liquid stream is heat exchanged against a bottoms stream of the distillation column that is recycled through the heat exchanger and returned to the distillation column, to transfer heat from the reaction liquid stream to the bottoms and to obtain a cooled reaction liquid stream, and returning the cooled reaction liquid stream to the hydroformylation reactor. The process allows for an efficient heat integration.

This invention provides a low-energy-consumption isobutyraldehyde separation system, comprising an atmospheric distillation column and a pressurized distillation column connected by a thermally coupled pipeline. This invention utilizes thermal coupling technology to use the steam generated in the pressurized distillation column as a heat source for the atmospheric distillation column, significantly reducing energy consumption. Furthermore, the optimized internal structure and distributor design improve separation efficiency and reduce equipment investment and operating costs. Compared with existing technologies, this invention represents a significant advancement in energy saving, separation efficiency, and operational stability, making it suitable for large-scale industrial production.