37 results about "Aldehyde synthesis" patented technology

The invention relates to a method for synthesizing a phyllocnistis citrella stainton pheromone compound. (Z)-7-hexadecene aldehyde is synthesized by using 1,7-heptandiol and bromo-n-nonane as starting materials and through six steps of reactions (comprising a Witting reaction); (Z,Z)-7,11-hexadecadienoic aldehyde is synthesized by using the 1,7-heptandiol, 1,4-butanediol and bromo-n-pentane as starting materials and through multi-step of reactions (comprising two Witting reactions); and (Z,Z,E)-7,11,13-hexadecatrienoic aldehyde is synthesized by using 2-octyne-1-alcohol, 1-iodine-3-chloropropane and trans-2-amylene aldehyde as starting materials and through multi-step of reactions (comprising a coupling reaction and a Witting reaction). The invention has the advantages of low price and easy obtaining of raw materials, simple and reasonable synthesizing route, convenient and safe operation and high utilization rate of the raw materials.

The invention relates to a technology for synthesizing isoprene with olefine aldehyde. The technology adopts a unit for preparing formaldehyde from methanol and a liquid phase olefine aldehyde synthesis unit, wherein 1) the unit for preparing formaldehyde from methanol comprises an air compression process, a reaction process, a formaldehyde absorption process and a steam generation process; 2) the liquid phase olefine aldehyde synthesis unit: TMC from a TMC preparation unit and dioxane fractions from a dioxane preparation unit enter isoprene reactors together, the materials after reaction enter a precipitation tank to be precipitated, the materials at the bottom of the tank are pumped out by a pump and are sent to a dehydrating tower of the dioxane preparation unit to be circulated, the materials at the bottom of the tower enter a fractionating tower and an isoprene monomer is obtained on the top of the fractionating tower and then enters a synthetic rubber unit. The technology has the beneficial effects of reducing the isoprene production cost, improving the purity of isoprene and reducing the wastewater and waste gas emission in the technology.

The invention discloses a vitamin A aldehyde synthesis process. The invention has the process steps that vitamin A alcohol is taken as the raw material, which is performed with oxidation reaction under a certain reaction temperature and a certain reaction time, and under the existence of catalytic agent and organic solvent, so as to prepare vitamin A aldehyde, the catalytic agent is formed by a catalyzing system composed of main catalytic agent and auxiliary catalytic agent, and the main catalytic agent adopts one of 4-methoxy-1-oxo-2, 2, 6, 6-tetramethyl-piperidine, and 4-ethoxy-1-oxo-2, 2, 6, 6-tetramethyl-piperidine. The invention has the advantages that the stability of the catalytic agent is high, the catalytic activity is high, the utilization quantity is small, the reaction speed is quick, and the yield rate is high.

The invention discloses a device and process for purifying peach aldehyde by intermittent rectification under reduced pressure, which belongs to the separation and purification technology for synthesizing peach aldehyde. The device consists of a rectification tower, a condenser, a reflux tank, a surge tank, a vacuum pump, and a storage tank. The tower is equipped with high-efficiency packing. It is characterized in that the still of the rectification tower is a jacket column with a height-to-diameter ratio of 0.6 to 0.3. tube heater. The device is used to carry out the process of purifying peach aldehyde by intermittent distillation under reduced pressure. The pressure at the top of the tower is 133.3Pa ~ 1333Pa, and the temperature of the bottom of the tower is 150 ~ 180°C. Peach aldehyde with light components and qualified purity. The invention has the advantages that the tower kettle has the characteristics of small liquid film thickness, high evaporation efficiency, large heat transfer coefficient and short material residence time, the operation process of the tower is simple, and the product purity can reach more than 99 wt%.

The invention discloses a method for preparing aldehyde compounds by two-phase hydroformylation of olefins, and belongs to the technical field of aldehyde synthesis. Formamide, N-methylformamide, N,N-dimethylformamide, etc. are used as solvents to make alkenes and H 2 / CO synthesis gas hydroformylation reaction to generate aldehydes, because the solubility of olefins in large polar organic solvents is much greater than its solubility in water, the reactivity is greatly improved compared with water-oil two-phase hydroformylation; reaction After the end, the system automatically separates phases, the upper layer is the product aldehyde with low polarity, and the lower layer is the high polarity solvent phase, and the water-soluble catalyst is dissolved in the high polarity solvent phase, and the multiple cycles of the catalyst can be realized through the liquid separation operation Utilization; the invention has the characteristics of mild reaction conditions, high selectivity and high conversion rate, and the catalyst can be circulated for a long time, and has excellent industrial application prospects.

The invention discloses a method for preparing an aldehyde compound by olefin two-phase hydroformylation, and belongs to the technical field of aldehyde synthesis. The method comprises the following steps: forming a catalytic system by using a water-soluble phosphine ligand and a rhodium catalyst, and synthesizing the aldehyde compound by using cheap and accessible high-polarity formamide, N-methylformamide, N, N-dimethylformamide and the like as solvents; enabling olefin and H2 / CO synthesis gas to be subjected to hydroformylation reaction to generate aldehyde. Due to the fact that the solubility of olefin in a high-polarity organic solvent is much higher than that of olefin in water, the reaction activity is greatly improved compared with that of water-oil two-phase hydroformylation; after the reaction is finished, the system is subjected to automatic phase splitting, the upper layer is a small-polarity product aldehyde, the lower layer is a large-polarity solvent phase, a water-soluble catalyst is dissolved in the large-polarity solvent phase, and repeated cyclic utilization of the catalyst can be realized through liquid splitting operation; the method has the characteristics of mild reaction conditions, high selectivity and high conversion rate, and the catalyst can be recycled for a long time and has an excellent industrial application prospect.

The invention relates to the field of daily chemicals and the pharmaceutical industry, in particular to a preparation method and application of a chitosan diquaternary ammonium salt derivative. Chitosan diquaternary ammonium derivatives are qcts2Py, qcts3Py or qcts4Py shown in formula (1), (2) or (3); with chitosan as raw material, the corresponding pyridine aldehydes are synthesized to generate corresponding Schiff base, and then reduced by sodium borohydride to obtain N-substituted chitosan, and then reacted with methyl iodide to obtain biquaternary ammonium chitosan derivatives. Compared with the chitosan raw material, the shown biquaternary ammonium salt derivative has good antioxidant activity. The present invention has synthesized chitosan diquaternary ammonium salt derivatives through effective synthetic means, and water solubility is better, and antioxidant activity is significantly improved, has strengthened the biological activity of chitosan, expanded the application scope of chitosan, can Used in daily chemical and pharmaceutical industries and other fields.

The invention provides a method for treating high-concentration wastewater in a citral synthesis process. Using high-concentration wastewater obtained by oxidizing 3-methyl-3-butene-1-alcohol to prepare 3-methyl-3-butene-1-aldehyde as a raw material, the steps include: stripping and separating alcohols contained in the high-concentration wastewater compound and aldehyde compounds, converting high-concentration wastewater into low-concentration wastewater containing acetal compounds; converting the acetal compounds in the low-concentration wastewater into 3-methyl-3-butene-1 alcohol and 3-methyl-3-butene-1-aldehyde, to obtain low-concentration waste water containing hydrolyzate; Separating the low-concentration waste water containing hydrolyzate by stripping 3-methyl-3-butene-1 alcohol and 3-methyl base-3-butene-1-aldehyde, reducing the COD of the treated wastewater to below 200ppm. The method is economical, has high processing efficiency, and converts heavy component impurities into process raw materials and products, thereby improving the separation yield.

The invention relates to preparation and application of a titanium dioxide loaded molybdenum trioxide and vanadium pentoxide catalyst, and belongs to the technical field of catalyst preparation. The active component of the catalyst is a compound composed of molybdenum oxide and vanadium oxide, the catalytic activity of the compound can be adjusted through the ratio of molybdenum oxide to vanadium oxide so as to improve the selectivity of a target product, and the catalyst mainly comprises a molecular sieve, heteropoly acid and the like and is excellent in aldehyde synthesis performance through alcohol oxidation. However, the defects of high preparation cost, high wastewater and the like exist. In the catalyst preparation process, only the ammonium sulfate aqueous solution is generated and can be used as a nitrogen fertilizer, no three wastes are generated, the preparation cost is low, and the performance is excellent.

Solid-supported gold nanoparticles for use as a catalyst for the synthesis of quinolines from anilines and aldehydes using oxygen as an oxidant are provided. Also provided are a method for the preparation of Si02-supported gold nanoparticles by in situ deposition of gold nanoparticles to silica gel and a method for synthesizing quinolines from anilines and aldehydes using oxygen as an oxidant.

The invention relates to high-carbon aldehyde synthesis, and provides a high-activity high-carbon aldehyde synthesis catalyst, which realizes the conversion of high-carbon α-olefin into high-carbon aldehyde, the conversion rate of α-olefin is close to 100%, and the yield of product aldehyde is 96%. The catalyst of the invention comprises metallic cobalt Co and nickel Ni, non-metallic phosphorus P and boron B to form a Ni-Co-P-B amorphous alloy. Compared with traditional metal catalysts, this catalyst belongs to non-equilibrium metastable state in thermodynamics, and has unique coordination unsaturation, electronic interaction, and adjustable composition, showing superior catalytic performance. The catalyst according to the invention has the advantages of simple preparation process, low cost, high activity and adjustable product ratio.

The invention relates to a simple preparation method for a Fe3O4@C@TiO2 magnetic separation photocatalyst. The method includes steps: 1) taking beta-FeOOH nanorods, and dispersing into water to form dispersion liquid; 2) adopting resorcinol and formaldehyde for synthesizing FeOOH@RF core-shell nanorods, and dispersing into ethyl alcohol to form dispersion liquid; 3) adding ethyl alcohol, CH3CN and ammonium hydroxide, and well stirring and mixing to form liquid A; taking ethyl alcohol and CH3CN again, well mixing, and adding TBOT to form liquid B; mixing for room-temperature reaction for a certain time to obtain the nanorods; 4) performing high-temperature calcinations to obtain the Fe3O4@C@TiO2 magnetic separation photocatalyst. The method has advantages that the magnetic-response recyclable Fe3O4@C@TiO2 visible-light nanometer photocatalyst is prepared according to the simple and mild method; the method is simple in operation and low in equipment requirement, and the prepared Fe3O4@C@TiO2 core-shell nanorods are high in dispersity and uniform in nanoparticle size.

The invention discloses a regulating device for a propionaldehyde synthesis reactor, comprising an installation shell, a belt conveyor is installed in the installation shell, and a plurality of baffles are fixed on the surface of the conveyor belt of the belt conveyor, and the installation shell is An inclined table is installed inside, and a conveying device for pushing sodium metal and capable of removing surface sodium oxide impurities is installed on the inclined table, and a slitting device for convenient sodium metal reaction is installed on the side wall of the installation shell. Pour a certain amount of kerosene into the installation shell to prevent the oxidation reaction of sodium metal and air in the installation shell. It has a negative impact on the reaction. At the same time, the metal sodium strip is divided into several sodium sheets by the slitting device, and the mass of the metal sodium can be calculated, so that the reaction after the metal sodium is added is more sufficient, fast, and more thorough, and the reaction efficiency is improved.