10 results about "Isobutylaldehyde" patented technology

The invention relates to the technical field of functional materials, in particular to a polyvinyl butyral flexible material as well as a preparation method and application thereof. The molecular chain regularity is destroyed through an isobutyraldehyde branched chain, the crystallinity is reduced, and the flexibility is improved; cesium-tin co-doped tungsten oxide has high infrared rejection rate and good dispersity, and the influence on the flexibility of the material is reduced; magnesium salicylate and magnesium formate are compounded, so that the reaction activity with resin is reduced, and the bonding stability in the bending process is ensured; the flexibility and migration resistance of the material are synergistically improved through the flexible plasticizer, and the interlayer sheet is prevented from being sticky; the flexible reinforcing agent polycaprolactone micro powder is used for forming an elastic node, bending stress is absorbed, and the recovery performance is improved. The polyvinyl butyral flexible material provided by the invention has flexible bending performance, an efficient infrared barrier function and stable bonding performance, is suitable for scenes such as curved building curtain walls, special-shaped automobile sunroofs or arc-shaped rail traffic windows, and has a wide application prospect.

The invention discloses a Pd supported catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The Pd supported catalyst is prepared according to the following steps: dissolving TEOS and MSDS in absolute ethyl alcohol, stirring, adjusting the pH value, aging at room temperature, and drying to obtain a mixture; and extruding the mixture into a long strip shape, calcining to prepare a TiO2-SiO2 composite carrier, dipping the TiO2-SiO2 composite carrier in a palladium nanoparticle solution, filtering, washing, and drying in vacuum to obtain the catalyst. The preparation method is simple and green in process, the reaction process is safe and easy to control, the prepared Pd supported catalyst is good in crystallization, high-dispersion nano-particle morphology, uniform in size and uniform in dispersion, and when the Pd supported catalyst is applied to co-production of methyl isobutyl ketone and methyl isoamyl ketone from mixed aldehyde and ketone, the isobutyraldehyde conversion rate can be effectively increased, and the yield of methyl isobutyl ketone and methyl isoamyl ketone can be effectively increased. The selectivity on methyl isoamyl ketone is good, and organic impurities in the product are few.

This invention provides a biomass-derived phenol composition in which moldy odor is suppressed. [Solution] A phenol composition containing biomass-derived phenol (A), wherein the peak height percentage corresponding to isobutyraldehyde in total ion chromatography by GC-MS after pretreatment by 150°C headspace method is 4.0% or less.

The invention provides a liquid chromatography detection method and a quantitative determination method for volatile carbonyl compounds in cigarette smoke. The liquid chromatography detection method is based on a DNPH compound special chromatographic column and gradient elution, adopts a mobile phase composed of water and acetonitrile in a volume ratio of 1: 1-1: 9, and realizes the determination of n-butyraldehyde and isobutyraldehyde in the cigarette smoke as well as the determination of n-butyraldehyde and isobutyraldehyde and other 7 carbonyl compounds required to be determined in ISO 21160 and YC / T 254-2008 standards for the first time. The volatile carbonyl compounds such as formaldehyde, acetaldehyde, acetone, acrolein, propionaldehyde, crotonaldehyde, 2-butanone and the like are effectively separated, and the effective separation of the volatile carbonyl compounds and other interferents in the smoke is further realized. The invention further provides a quantitative determination method for volatile carbonyl compounds in cigarette smoke, a liquid chromatography-ultraviolet analysis method is adopted, the liquid chromatography is the liquid chromatography detection method, and the accuracy and reliability of the quantitative determination result are remarkably improved.

The invention provides a preparation method of 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol, which comprises the following steps: S1, taking isobutyraldehyde as a raw material, reacting with a protective agent with an R group under the action of a catalyst system to obtain an intermediate I, adding isobutyryl chloride, and carrying out cyclization reaction to obtain an intermediate II; s2, carrying out catalytic hydrogenation reaction on the intermediate II and a reducing agent under the action of a catalyst to obtain an intermediate III; and carrying out hydrolysis reaction on the intermediate III to obtain the 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol, wherein the protective agent comprises anhydride and / or silane; the reaction route is as follows: a protecting group is introduced through enolation to increase steric hindrance, high-selectivity hydrogenation reduction is performed in the presence of a catalyst, 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol with a high cis-trans ratio is obtained, the cis-trans ratio is as high as (200-1000): 1, traditional harsh reaction conditions of high temperature and high pressure are avoided, and meanwhile, the new route also avoids the situation that a large amount of trans-2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol is converted into 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol is converted into 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol. The method can be used for generating 1, 2, 3, 4-tetramethyl-1, 3-cyclobutanediol, so that the cost is greatly reduced.

An apparatus and a method for manufacturing an isobutyric acid. The apparatus includes a reaction tank, air inlet and outlet tubes, and a stirrer in the reaction tank. The air inlet and outlet tubes are connected to the reaction tank, so as to respectively introduce a working gas into the reaction tank and guide a reacted gas out of the reaction tank. The stirrer includes a hollow shaft and blades. An air suction hole is formed on a first end of the hollow shaft and exposed from a liquid surface of the reaction tank. An air discharge hole is formed on a second end of the hollow shaft and immersed into the liquid surface. A condenser and an end of the air outlet tube opposite to the reaction tank are connected for condensation of the reacted gas, so as to obtain isobutyraldehyde and an exhaust gas.

The application relates to the technical field of neopentyl glycol synthesis, in particular to a neopentyl glycol synthesis system and method; the synthesis method comprises the following steps: respectively performing first dispersion treatment on formaldehyde, isobutyl aldehyde and an alkaline catalyst to obtain formaldehyde droplets, isobutyl aldehyde droplets and alkaline catalyst droplets; performing a first condensation reaction on the droplets under a first constant temperature condition to obtain a first mixed reaction liquid; performing second dispersion treatment on the first mixed reaction liquid to obtain first mixed reaction liquid droplets; performing a second condensation reaction on the first mixed reaction liquid droplets under a second constant temperature condition to obtain a second mixed reaction liquid; and performing purification treatment on the second mixed reaction liquid to obtain a neopentyl glycol product. The synthesis method combines two segmented condensation reactions and precise temperature control, the method not only reduces the formaldehyde usage, but also effectively reduces the water solution system of the condensation reaction, the conversion efficiency of raw materials can be improved to more than 85%, and the product yield can be improved to more than 75%.

The application discloses a supported heterogeneous catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: step 1, mixing a cobalt salt and a rare earth metal salt in a solvent to obtain a mixed solution, and adding hydrated citric acid to react to obtain a gel; step 2, mixing the gel after aging with a carrier precursor in deionized water, drying to remove water, and calcining to obtain the supported heterogeneous catalyst. In the synthesis aspect of the catalyst, the rare earth metal is introduced as an additive to improve the catalytic performance; in the carrier selection aspect, the selection of the carrier precursor is relatively innovative. The obtained catalyst has the characteristics of being beneficial to separation and recovery, high propylene conversion rate, high isobutyl aldehyde selectivity and low catalyst deactivation.

The application discloses a synthesis method of isobutylene hydantoin, and belongs to the technical field of drug production process innovation, and is characterized by comprising the following steps: taking hydantoin and isobutyl aldehyde as raw materials, taking polyionic liquid SP-PIL-OH as a catalyst, taking deionized water as a solvent, and reacting under a reflux state for 8-12 hours; after the reaction is completed, isobutylene hydantoin is prepared through extraction, concentration and drying; the application prepares polyionic liquid SP-PIL-OH containing a spiropyran, which is used as a catalyst to catalyze the hydrolysis of benzaldehyde hydantoin to generate isobutylene hydantoin; through experiments, it is found that the aforementioned alkaline polyionic liquid can be well recycled when used as a catalyst to prepare isobutylene hydantoin, the yield of isobutylene hydantoin is improved, and the technical difficulties of large alkali consumption, low yield and large three-waste emission in the prior art are effectively solved.

The invention discloses a preparation method of 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol, and belongs to the technical field of organic synthesis. The method comprises the following steps: taking isobutyraldehyde as a raw material, and reacting with hydroxylamine hydrochloride in the presence of 1-butyl-3-methylimidazole chloride and a catalyst Bu4NPF6 to generate isobutyronitrile; reacting under the action of methyl trichlorosilane and methanol, and acidifying after alkaline hydrolysis to generate 2-methyl propionic acid; under the action of a dehydrating agent and triethylamine, 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanedione is generated; finally, bis (2-methoxyethoxy) sodium aluminum hydride is adopted for reduction, and 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol is obtained. The key point of the route is that 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanedione is generated from 2-methylpropionic acid under the combined action of a dehydrating agent and triethylamine, and the method is simple and convenient to operate and suitable for industrial production.