189 results about "Propionaldehyde" patented technology

The invention discloses incombustible water-based aerosol spray paint and a preparation method thereof, and relates to the technical field of spray paint. When the non-combustible water-based aerosol spray paint is prepared, firstly, p-(triethoxysilyl) acetophenone reacts with trimethylchlorosilane, and then the reaction product and tetramethyl tetravinyl cyclotetrasiloxane are subjected to ring opening polymerization to obtain modified polysiloxane; grafting epoxy resin with 4-vinyl-methyl benzoate, reacting with modified polysiloxane to obtain modified epoxy resin, and emulsifying to obtain a modified epoxy resin emulsion; secondly, reacting the silicon dioxide subjected to acylating chlorination with 4-hydroxy-2, 2, 6, 6-tetramethylpiperidine nitroxide free radicals, reacting with 3-(3-thienyl) propionaldehyde, and reacting with thiophene and 3-vinyl thiophene to obtain modified silicon dioxide; and finally, mixing the modified epoxy resin emulsion, pure water, the modified silicon dioxide, a curing agent and a photoinitiator to prepare the incombustible water-based aerosol spray paint.

The invention relates to the technical field of polyether polyol refining, and particularly discloses a method for continuously removing light components in polyether polyol, which comprises the following steps: mixing polyether polyol and deoxygenated water; according to the method, polyether polyol is continuously added into a light component removal tower and a dehydration tower, light components and water in the polyether polyol are removed through a process combining reduced-pressure flash evaporation, bubbling temperature increasing, steam stripping and nitrogen stripping, and purified polyether polyol is obtained. The difficulty of polyol quality control in the production stage is reduced, and the content of formaldehyde, acetaldehyde and propionaldehyde in the purified polyether polyol product obtained by the method can be as low as 10 ppm or below and is at the advanced level of the industry.

The invention belongs to the technical field of polyether synthesis, and discloses a preparation method of low-odor polyether. The preparation method comprises the following steps: adding an alcohol initiator and a catalyst into a reaction kettle, heating, and adding epoxide for reaction to prepare a polyether crude product; adding the polyether crude product into a post-treatment kettle, adding acid and an adsorbent for treatment, and filtering to obtain refined polyether; and adding the refined polyether and steam without air into a deodorizing kettle at the same time, and performing deodorizing treatment to obtain the low-odor polyether. The odor of the polyether can be effectively reduced, the content of formaldehyde is lower than 0.1 ppm, the content of acetaldehyde is lower than 0.3 ppm, the content of propionaldehyde is lower than 1.0 ppm, the content of acrolein is lower than 0.05 ppm, the content of acetone is lower than 0.5 ppm, and the odor grade is 1; and the preparation method is simple, and the odor removal time can be greatly shortened.

A recycle content ethylene is fed to a reactor to make propionaldehyde having recycle content. The recycle ethylene feedstock is derived directly or indirectly from the cracking of recycle content pyrolysis oil. The cracking of the pyrolysis oil can be conducted in a gas furnace or a split furnace.

A process and a production plant for producing methacrolein from formaldehyde and propionaldehyde in the presence of a homogeneous catalyst mixture which is based at least on an acid and a base can be used. A catalyst mixture commonly used for this synthesis has an organic acid and a secondary amine. The presence of the homogeneous catalyst mixture in the reaction mixture is an essential prerequisite for achieving a high yield. The process realizes better water management, thus making it possible not only to reduce the total catalyst amount required but also to reduce undesired catalyst byproducts more efficiently than before.

[Problem] To provide a means capable of more efficiently exerting an antibacterial effect against bacteria. [Solution] An antibacterial agent containing at least two compounds selected from the group consisting of trans-2-methyl-2-pentenal, 2-methylbutanal, trans-2-hexenal, propionaldehyde, 3-methylpentanol, and 2,5-dimethylfuran.

The invention relates to the technical field of pesticide production, and particularly discloses a preparation process of glufosinate-ammonium intermediate 3-(methyl hydroxyl phosphonyl) propionaldehyde. The preparation method comprises the following steps: 1, carrying out addition reaction on diethyl methylphosphonite and acrylic acid in absolute ethyl alcohol to generate 3-[ethyoxyl (methyl) phosphonyl] propionate; in the second step, 3-[ethyoxyl (methyl) phosphonyl] propionate is subjected to a hydrosilylation reaction in an oriented mode, and 3-triethyl siloxy-3-ethyoxyl propyl methyl ethyl phosphonate is generated; and 3, carrying out a simple dilute acid hydrolysis reaction to obtain the 3-(methyl hydroxyl phosphonyl) propionaldehyde. According to the method, a three-step reaction route of addition-hydrosilylation-hydrolysis is adopted, and the acrylic acid is used for replacing the traditional high-toxicity raw material acrolein, so that the toxicity risk is avoided from the source, the yield of the target glufosinate-ammonium intermediate is remarkably improved, the total yield of the three-step reaction can reach 95% or above, and the method is suitable for industrial production. And an efficient and green brand-new technical scheme is provided for large-scale production of glufosinate-ammonium.

The application relates to a high-efficiency molecular sieve adsorbent for deep purification of oxygenates and preparation and application of the adsorbent, and the preparation process comprises the following steps: 1) molecular sieve synthesis: uniformly mixing an aluminum source, a silicon source, alkali, a template agent and water to obtain a crystallization liquid, aging, then carrying out microwave hydrothermal crystallization and traditional hydrothermal crystallization to obtain EMT / 13X mixed crystal molecular sieve, and then carrying out pressure filtration to obtain a wet filter cake; 2) granulation: drying the wet filter cake, uniformly mixing inorganic additives and pore-forming agents, rolling and granulating, and then drying; and 3) calcination: placing the granulated product in an oxygen-containing atmosphere for calcination, so that the EMT / 13X composite molecular sieve adsorbent is obtained. The application breaks through the double-template method for synthesizing the EMT / 13X mixed crystal molecular sieve with an EMT molecular sieve as the main component, complete structure and high crystallinity, the specific surface area of the molecular sieve is greater than or equal to 450 m 2 / g, ethylene adsorption heat is less than or equal to 70 DEG C, the oxygenate adsorption capacity is increased by more than 30%, the purification depth can reach below 1 ppb, and the molecular sieve is suitable for efficient removal of trace nonpolar or polar oxygenates such as dimethyl ether, methanol and propyl aldehyde in low-carbon olefins.

A process for the manufacture of one or more ethylene-derived chemical(s) having a bio- based carbon content comprises the steps of (a) providing a first ethylene stream by (a-i) providing a cracker feed stream containing bio-naphtha and fossil-based hydrocarbons, (a-ii) subjecting the cracker feed to steam cracking to obtain a cracker effluent, (a-iii) recovering from the cracker effluent the first ethylene stream; (b) providing a second ethylene stream having a bio-based carbon content; (c) combining the first ethylene stream and the second ethylene stream to obtain a combined ethylene stream; (d) converting the combined ethylene stream to at least a first generation ethylene-derived chemical selected from (α) ethylene oxide, (β) ethylbenzene, (y) ethylene dichloride; and (δ) propionaldehyde; and (e) optionally subjecting the first generation ethylene-derived chemical to a chemical conversion or a sequence of chemical conversions to obtain a downstream ethylene-derived chemical. The process allows for efficient operation of the steam cracker while allowing for the production of ethylene-derived chemicals with a predetermined bio-based carbon content.

A method for controlling a chemical process, by preparing methanol, hydrogen sulfide, methyl mercaptan, hydrocyanic acid, acrolein, 3-methylthiopropionaldehyde, 5-(2-methylmercaptoethyl)-hydantoin, methionine, a salt of methionine, and a derivative of methionine. The method includes providing a training set TS1, wherein TS1 is process values PV1 and process values PV2 being correlated to one another, and / or laboratory values LV1 and process values PV2 being correlated to one another. The method includes training a processing unit on the training set TS1 to identify a pattern of correlation between one or more measured process variables and at least one process variable. The method includes developing a calibration function CF1 for a calibrated soft sensor from the identified pattern of correlation and predicting at least one operating parameter for the chemical process as an approximation to LV1 and / or PV1. A system for controlling a chemical process.

This invention provides a 1,3,5-triarylbenzene compound and its preparation method, which involves uniformly mixing α,β-unsaturated ketones, 2-phenylpropanal, and elemental iodine, followed by heating to react, thereby obtaining the compound. Compared with existing technologies, this invention has the following advantages: the reaction conditions are mild, the method is simple and rapid, and the substrate applicability is wide, which is beneficial for industrial production. Furthermore, the structure of the prepared 1,3,5-triarylbenzene compound is more complex and diverse.

This invention belongs to the field of organic synthesis technology and relates to a precursor of an obisec key intermediate and a method for preparing the key intermediate. The method involves a [4+2] cycloaddition reaction of 4-trifluoromethylaniline, propionaldehyde, and N-vinylformamide under the catalysis of chiral phosphoric acid, yielding the obisec key intermediate precursor with high enantioselectivity. N -((2) R 4 S )-2-ethyl-6-trifluoromethyl-1,2,3,4-tetrahydroquinoline-4-yl)formamide; subsequently, the key intermediate of obisetri can be obtained through a deprotection reaction under acidic conditions. The method provided by this invention uses a small amount of chiral catalyst and commercially available reagents to efficiently obtain the key intermediate of obisetri in just two steps. R 4 S )-2-ethyl-6-trifluoromethyl-1,2,3,4-tetrahydroquinoline-4-amine; under mild conditions without the need for chiral resolution, the utilization of starting materials is greatly improved, thereby significantly increasing the yield of the target product and the economic efficiency of the process.

The invention discloses an exhaled gas VOC (volatile organic compound) marker for detecting inflammatory bowel diseases and a detection system thereof. The marker is a combination of one or more of the following components: methyl propyl sulfide, propionaldehyde, cyclohexanone, allyl methyl sulfide, octanal, 2-pentanone, phenol, butyric acid, propionic acid and 3-methylheptane. The detection system comprises an exhaled air sampling module, a sample preprocessing module, a detection analysis module and a data analysis module. The marker provided by the invention has the advantages of high specificity and good stability, can realize accurate noninvasive diagnosis of IBD, and can assist in realizing early screening and dynamic monitoring in a clinical environment.

The invention belongs to the technical field of medicine preparation, and particularly relates to a fenoprofen calcium preparation method which comprises the following steps: 1) m-hydroxyacetophenone and bromobenzene generate an intermediate 1, namely m-phenoxyacetophenone under the action of alkali and cuprous iodide; 2) reacting the intermediate 1 with ethyl chloroacetate under the action of strong base, and then performing hydrolysis and decarboxylation reaction to generate an intermediate 2, namely 2-(3-phenoxy phenyl) propionaldehyde; the invention discloses a preparation method of fenoprofen calcium, which comprises the following steps: (1) preparing fenoprofen, (2) preparing fenoprofen, (3) carrying out oxidation reaction on an intermediate 2 to obtain fenoprofen, (4) reacting fenoprofen with a sodium hydroxide solution to obtain fenoprofen sodium, and (5) salifying fenoprofen sodium with a calcium chloride solution to obtain fenoprofen calcium.

The application provides a preparation method and product of 1,3-propanediol. The preparation method comprises the following steps: subjecting 3-hydroxypropionaldehyde aqueous solution to a first-stage hydrogenation reaction under the action of a first-stage hydrogenation catalyst to obtain a first-stage hydrogenation reaction product; and subjecting the first-stage hydrogenation reaction product to a second-stage reaction under the action of a second-stage hydrogenation catalyst to obtain a 1,3-propanediol product. The preparation method adopts two-stage hydrogenation, effectively improves the economy of the propenal hydration hydrogenation process, and solves the problems that the impurities generated in the 1,3-propanediol preparation route of the propenal hydration process are difficult to treat and resource utilization.

The invention discloses a method for simultaneously determining the contents of ten carbonyl compounds in tobacco flavors based on UPLC; the method uses ultra-high performance liquid chromatography, specially selected HSS T3 chromatographic columns, DNPH-HCL (2,4-dinitrophenylhydrazine hydrochloride) pre-column derivatization and ternary mobile phase for gradient elution, and is supplemented by other suitable experimental means to achieve simultaneous analysis and determination of ten carbonyl compounds in tobacco flavors, including formaldehyde, acetaldehyde, acetone, acrolein, propionaldehyde, crotonaldehyde, 2-butanone, butyraldehyde, acetoin and diacetyl; compared with the prior art in which only eight carbonyl compounds can be determined, the technical effect is significant, and the ten carbonyl compounds in tobacco flavors can be quickly and effectively separated completely.

This invention provides the application of compounds in attracting or controlling midges, relating to the field of midge control technology. Through screening and identification, this invention has obtained five compounds (butyric acid, butyraldehyde, propionaldehyde, 2-hexanone, and acetophenone) with significant attractant activity against Formosan midge. These compounds can be used alone or in combination, are environmentally friendly and have a high affinity for non-target organisms, greatly enriching the candidate resource of midge attractants. They can be directly applied to the monitoring and large-scale trapping of midges, effectively reducing midge population density, thereby reducing midge bites and the spread of midge-borne diseases, which has significant public health implications.

The present invention relates to a recombinant microorganism having enhanced 3-hydroxypropionic acid production capability, the microorganism having 3-hydroxypropionic acid biosynthesis pathways in which a pathway for converting 3-hydroxypropionaldehyde to 3-hydroxypropionic acid and a pathway for converting acetate to acetyl-CoA are enhanced. In addition, the present invention relates to a method for producing 3- hydroxypropionic acid by using the recombinant microorganism for producing 3-hydroxypropionic acid.

The application provides a black fungus provenance characteristic molecular marker and application thereof, and the molecular marker comprises the following: the molecular marker 2-acetyl furan, beta-pinene and 2-pinene of Shaanxi black fungus; the molecular marker 2-propanol and 2, 6-dimethyl pyrazine of Heilongjiang black fungus; the molecular marker pentanal and 2-butanone of Jilin black fungus; the molecular marker n-hexanal and acetic acid of Zhejiang black fungus; and the molecular marker 2-methyl propionaldehyde and hexanoic acid of Fujian black fungus. The molecular marker can be used for identifying the provenance of black fungus. The application first provides the provenance characteristic molecular marker of black fungus, the molecular marker can replace all chemical components of black fungus and serve as a detection basis of the provenance of black fungus; compared with existing black fungus physical and chemical indexes and artificial sensory recognition analysis, the provenance characteristic molecular marker of black fungus provided by the application improves the accuracy and recognition rate of detection, and provides a simple, rapid and effective scheme for provenance identification of black fungus.

The present invention provides a method for producing liquid methionine or methionine, and particularly provides a method for producing liquid methionine or methionine by condensation reaction of 3-hydroxypropionaldehyde and formyl-CoA derived from a C1 substrate. The present invention also provides a genetically engineered microorganism for the production of liquid methionine or methionine.

The application discloses a preparation method of butanediamine, which comprises the following steps: synthesizing cyanopropyl aldehyde by adopting synthesis gas and acrylonitrile, and then performing ammoniation hydrogenation on the cyanopropyl aldehyde to produce 1,3-butanediamine and 1,4-butanediamine in a combined manner. According to the synthesis route, the total yield of the product butanediamine is greater than or equal to 95%, and compared with the hydrocyanic acid method, the ammoniation hydrogenation catalyst has the advantages of low single consumption and low total production cost of the product.

The invention discloses a method for preparing 1, 3-propylene glycol based on catalysis of a copper complex, and relates to the technical field of catalytic hydrogenation of aldehyde. According to the method, the problems of high reaction temperature and poor selectivity in the prior art are solved, the reaction process is simple, the yield of 1, 3-propylene glycol is high, and the selectivity is good; a cheap copper catalyst phosphine ligand is used, so that the cost is relatively low; the reaction conditions are mild, the temperature and the pressure are relatively low, and the requirement on production equipment is not high; the reaction system is wide in application range; the 1, 3-propylene glycol is prepared by hydrogenation of the 3-hydroxypropionaldehyde, the method is milder and quicker, and the method is also suitable for hydrogenation reaction of other aldehyde substances.

The present invention relates to the preparation field of pesticide intermediates, and discloses a method for preparing a benzathine intermediate, including: (1) in the presence of a first solvent, a compound shown in formula (II) is subjected to a methylation reaction to obtain a compound shown in formula (III); (2) the compound shown in formula (III) is subjected to a diazotization reaction, and then reacted with formaldehyde oxime and chloropropionaldehyde oxime to obtain compounds shown in formula (IV-1) and formula (IV-2) respectively; (3) the compound shown in formula (IV-1) is reacted with sodium hypochlorite, and then reacted with ethylene, or, under alkaline conditions, the compound shown in formula (IV-2) is cyclized to obtain a compound shown in formula (V); (4) the compound shown in formula (V) is subjected to an oxidation reaction to obtain a benzathine intermediate shown in formula (I); wherein, in formula (I)-(V), R is an alkyl group of C1-C4. The method has mild conditions, high purity and high yield.

The invention relates to the field of perfume industry. More specifically, the present invention relates to the use of a composition of matter comprising 3-(4-isopropyl-2-methylphenyl) propionaldehyde and 3-(2-isopropyl-4-methylphenyl) propionaldehyde, both aldehydes being useful perfuming ingredients of the aldehyde, floral type, as perfuming ingredient or for controlling arthropods. Thus, according to described herein, the invention comprises a composition of matter of the invention as a perfuming composition or part of a perfumed consumer product.

Detected pungent odor composition from an air conditioning system comprising: 0.0006-0.1 ppm acetaldehyde; 0.0001-0.1 ppm propionaldehyde; 0.0003-0.004 ppm n-butyraldehyde; 0.01-30 ppm toluene; 0.001-2 ppm xylene; 0.007-7 ppm methyl ethyl ketone; 0.0011-0.13 ppm ethylhexanol; 0.0002-0.31 ppm benzothiazole; and 0.0001-0.21 ppm N-phenylbenzeneamine.

The present invention discloses a method for preparing beer having an ethanol content of 0-1.0 vol. %, comprising providing a medium having an ethanol content of 0-20 vol. %, which medium comprises restricted-fermentation beer; subjecting said medium to a distillation step, thereby reducing the quantity of one or more aldehydes selected from the group consisting of 2-methyl-propanal, 2-methylbutanal, 3-methylbutanal, 3-methylthiopropionaldehyde, phenylacetaldehyde, hexanal, trans-2-nonenal, benzaldehyde and furfural in the medium, and thereby also reducing the ethanol content, if present, to a content in the range of 0-1.0 vol. %. The invention furthermore discloses beer obtained with the said process.

The invention relates to a preparation method of a hydrogenation catalyst suitable for preparing n-propyl alcohol through liquid-phase hydrogenation of propionaldehyde, which comprises the following steps: S1, preparing a precursor solution: dissolving sodium carbonate in deionized water to prepare a mixed nitrate solution with the total metal ion concentration of 0.8-1.2 mol / L, and dissolving sodium carbonate in desalted water to prepare a sodium carbonate solution as a precipitator; s2, co-precipitation reaction: under a stirring condition, adding the mixed nitrate solution and a precipitant into a reaction kettle at the same time to obtain a precipitate, and after the precipitate is fully aged, removing foreign ions in the precipitate; s3, drying and roasting: drying the precipitate, and roasting in an air atmosphere to obtain composite oxide powder; s4, molding: preparing the composite oxide powder into cylindrical catalyst particles; and S5, secondary drying and roasting: carrying out drying treatment and roasting treatment on the cylindrical catalyst particles to obtain a final catalyst product.

This invention provides a non-naturally occurring genetically modified microbial organism that has been engineered to produce glyceraldehyde, glycerol, 3-hydroxypropionaldehyde or 1,3-propanediol using a pathway which enables the condensation of formyl-CoA with glycolaldehyde. This invention also provides a method for the production of glyceraldehyde, glycerol, 3-hydroxypropionaldehyde or 1,3-propanediol using a pathway which enables the condensation of formyl-CoA with glycolaldehyde. This invention additionally provides a method for the production of glycolaldehyde via the condensation of formyl-CoA and formaldehyde. Further, this invention provides a method for the formation of formyl-CoA from methane, methanol, formaldehyde or formate.

The present invention discloses a system for utilizing the reaction heat of propionaldehyde hydrogenation, which includes a circulating hot water tank, a circulating hot water pump, an auxiliary cooler, a propanol heat exchanger, a propionaldehyde hydrogenation reactor, a hot water heater, a first heat exchanger, a second heat exchanger, a circulating hot water air cooler, an auxiliary heater and a hot water pump; the circulating hot water tank is connected to the circulating hot water pump, and the circulating hot water pump is respectively connected to the auxiliary cooler, the propanol heat exchanger, the propionaldehyde hydrogenation reactor and the hot water heater; the propionaldehyde hydrogenation reactor is respectively connected to the hot water heater and the circulating hot water air cooler, and the circulating hot water air cooler is connected to the circulating hot water pump; the hot water heater is respectively connected to the first heat exchanger, the second heat exchanger and the circulating hot water tank, and the first heat exchanger and the second heat exchanger are connected to the circulating hot water tank; a circulating water circuit is formed between the circulating water heater, the hot water pump and the auxiliary heater. The system of the present invention is effectively combined to enable the system to be unaffected under abnormal conditions where the reaction heat of propionaldehyde hydrogenation is small or stopped.

A filtration device for propionaldehyde industrial wastewater, relating to the field of industrial wastewater treatment, includes a filter box, a filter screen, and a liquid suction mechanism. The filter screen is located inside the filter box, and the liquid suction mechanism is located on top of the filter box. The liquid suction mechanism includes a guide rod, a float plate, and a discharge pump. A top plate is provided on the top of the filter box, the guide rod slides through the top plate, the float plate is located at the bottom of the guide rod, and a suction nozzle is located at the bottom of the float plate. The discharge pump is located on the top plate, and the suction nozzle is connected to the discharge pump via an outlet pipe. This invention discharges propionaldehyde wastewater into the filter box, where it passes through the filter screen under its own gravity, resulting in more stable filtration pressure. The filtered propionaldehyde liquid is transferred through the suction nozzle to the outlet pipe and finally discharged, achieving stable pressure filtration of the propionaldehyde wastewater and resulting in a more uniform filtration degree.