15 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.

The invention discloses equipment for manufacturing isobutyric acid and a manufacturing method of isobutyric acid. The equipment for manufacturing isobutyric acid comprises a reaction tank, an air inlet pipe, an air outlet pipe and a stirrer. The gas inlet pipe is connected with the reaction tank and is used for introducing working gas into the reaction tank; and the gas outlet pipe is connected with the reaction tank and is used for guiding the reacted gas out of the reaction tank. The stirrer is arranged in the reaction tank and comprises a hollow shaft and a plurality of blades; the hollow shaft is provided with a first end and a second end which are oppositely arranged, the first end is provided with an air exhaust hole and exposed out of the liquid level of the reaction tank, and the second end is provided with an air exhaust hole and immersed in the liquid level. The other end, opposite to the reaction tank, of the gas outlet pipe is connected with the condenser so as to condense the reaction gas to obtain isobutyraldehyde and tail gas, and isobutyraldehyde can be conveyed back to the reaction tank through the pump to continue the reaction, so that the conversion rate is increased.

A method for preparing neopentyl glycol, the method including: feeding a feed stream containing formaldehyde and isobutyraldehyde to an aldol reactor and subjecting the feed stream to an aldol condensation reaction in the presence of a catalyst to obtain a first reaction product containing hydroxypivaldehyde; feeding the first reaction product to an aldol purification column; feeding the aldol purification column upper discharge stream to a decanter and separating an organic phase stream containing unreacted isobutyraldehyde and the catalyst and an aqueous phase stream containing a catalyst salt; feeding the aqueous phase stream to a saponification reactor to reduce the catalyst salt to a catalyst and recover the catalyst; and feeding the aldol purification column lower discharge stream to a hydrogenation reactor and subjecting the aldol purification column lower discharge stream to a hydrogenation reaction to obtain neopentyl glycol.

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.

The application provides a co-production device and process of isobutyraldehyde and n-butyraldehyde, and particularly relates to the technical field of olefin hydroformylation industry. The co-production device comprises a purification device, a hydroformylation device, a falling film evaporator device, a rectifying tower A, a rectifying tower B and a rectifying tower C which are sequentially connected; the bottom of the rectifying tower A is connected with the rectifying tower B; the bottom of the rectifying tower B is connected with the rectifying tower C. The co-production device realizes the production and separation of isobutyraldehyde and n-butyraldehyde simultaneously in one set of co-production device, effectively reduces energy consumption, is simple in equipment, high in production capacity and suitable for large-scale industrial production. Meanwhile, the obtained n-butyraldehyde and isobutyraldehyde products have a purity of more than 99.8 mol%, and a water content of less than 0.1 mol%, are higher in purity and meet the demand of high-end n-butyraldehyde and isobutyraldehyde products on the market.

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.

The invention discloses a V-Co-Mo three-metal catalyst, a preparation method and application of the V-Co-Mo three-metal catalyst in low-temperature oxidative desulfurization of fuel oil, the V-Co-Mo three-metal catalyst takes mesoporous gamma-Al2O3 or a mesoporous silicon-based material SBA-15 as a carrier to load metals V, Co and Mo, the preparation method is simple, the oxidative desulfurization temperature is low, and when the V-Co-Mo three-metal catalyst is applied to the low-temperature oxidative desulfurization of the fuel oil, the V-Co-Mo three-metal catalyst can be applied to the low-temperature oxidative desulfurization of the fuel oil. A small amount of an auxiliary agent isobutyraldehyde is added into an oxidation system, so that the activation of oxygen is more facilitated, finally, a deep desulfurization effect is achieved under a low-temperature condition close to normal temperature, thiophene sulfides in fuel oil are oxidized into corresponding sulfone substances, and the oxidation efficiency is improved. And then isobutyraldehyde and sulfone substances are extracted and separated from the fuel oil by using an extracting agent to obtain the low-sulfur fuel oil, so that the stability of an oil product and the safety of a production process are facilitated.

The utility model discloses a device for improving the purity of butyraldehyde, which comprises a rectifying tower, a condenser, an isobutyraldehyde return tank and an n-butyraldehyde receiving tank, in the separation process of mixed butyraldehyde, n-butyraldehyde is extracted from a side extraction pipeline in the middle of the rectifying tower, heavy components such as heavy components and terpolymers are extracted from the bottom of the rectifying tower, and the purity of butyraldehyde is improved.

The invention provides a method for extracting neopentyl glycol from wastewater, in the method, the wastewater comes from wastewater generated at the top of a neopentyl glycol light component removal tower, the content of the neopentyl glycol in the wastewater is about 10-15%, the generated wastewater directly enters a stripping tower, the stripping tower is filled with Pall ring filler, the neopentyl glycol in the wastewater is purified by raising the feeding position, and the neopentyl glycol in the wastewater is purified. According to the method, a light component removal tower is adopted, a 65-75% neopentyl glycol aqueous solution is produced at the bottom of the tower, a clear solution containing methanol and isobutyraldehyde is discharged from the top of the tower, neopentyl glycol in wastewater is separated at the pressure of 10-20 kPa and the temperature of 90-100 DEG C, and the recovered neopentyl glycol aqueous solution directly enters the light component removal tower through a returned material. According to the method, neopentyl glycol in the wastewater can be effectively recovered, the production cost is reduced, and the production benefit is increased.

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.