20 results about "Crotonaldehyde" patented technology

Provided herein are processes for preparing Compound A or a salt thereof, comprising admixing Compound B or a salt thereof and crotonaldehyde in the presence of an acid catalyst and a solvent to form Compound A

The invention provides a method for reducing crotonaldehyde in cigarette smoke. The method for reducing crotonaldehyde in cigarette smoke comprises the following steps: (1) mixing apocynum venetum extract with a solvent to prepare a first coating liquid; (2) applying the first coating liquid to the tobacco shreds; and (3) manufacturing cigarettes by adopting the tobacco shreds applied with the first coating liquid. The method can effectively reduce the content of crotonaldehyde in the mainstream smoke of the cigarettes, is simple to operate, easy to industrially realize, cheap and easily available in raw materials and low in production cost, the added substances are traditional Chinese medicine extracts, the requirements of food additive substances are met, the crotonaldehyde content in the smoke is reduced, meanwhile, the crotonaldehyde in the smoke can be coordinated with the cigarette smoke, and the aroma quality of the cigarettes is improved.

The present invention relates to a process for the production of butanol from ethanol, the process comprising the following steps: (i) reaction of aqueous ethanol to acetaldehyde in the presence of a ruthenium oxide catalyst, (ii) reaction of the acetaldehyde formed to crotonaldehyde, (iii) reaction of the crotonaldehyde formed to butanol. In each of steps (i), (ii) and (iii) an aqueous phase is present.

The invention discloses a method for deeply converting CO2 into acetaldehyde and crotonaldehyde, and belongs to the technical field of conversion of acetaldehyde and crotonaldehyde, and the method comprises the following steps: S1, taking one or a mixture of more of melamine, urea and dicyandiamide as a precursor, dissolving the precursor in an aqueous solution under a heating condition, and uniformly stirring until the precursor is completely dissolved; s2, adding one or more of deprotonation agents including triethylamine, isopropanolamine, 1-methylimidazole, n-butylamine, pyridine and tetramethylammonium hydroxide, mixing, and uniformly stirring; s3, placing in a hydrothermal reaction kettle, reacting under given temperature and time conditions, and cooling to room temperature; s4, carrying out centrifugal washing, drying and calcining to obtain polymeric carbon nitride with a crystal / amorphous interlaced interface; according to the method, other hydrogenation steps of the intermediate in the CO2 conversion process are inhibited, and on the basis of high yield and selectivity of acetaldehyde, C-C chain growth is further carried out to generate crotonaldehyde.

This method for producing EVOH comprises: a saponification step (I) in which an EVAc solution containing EVAc and an alcohol is supplied to the tower upper part of a tower reactor, alcohol vapor is supplied to the tower lower part and discharged from the tower upper part, the EVAc is saponified using a base catalyst, and the EVOH solution is taken out from the tower bottom; and an aldehyde reduction step (II) for obtaining an alcohol (b) by recovering the alcohol used in the saponification step (I) and reducing the aldehyde in the recovered alcohol (a) obtained, the aldehyde reduction step (II) including a step for bringing the recovered alcohol (a) into contact with an acetalation catalyst to reduce the aldehyde, and in the saponification step (I), the alcohol vapor supplied to the lower portion of the tower contains the alcohol (b), and the alcohol (b) contains crotonaldehyde. As a result, provided is a method for producing EVOH in which hue deterioration of the resulting EVOH is suppressed and environmental burden is reduced.

A method of ethanol conversion to higher carbon compounds is provided. The method includes feeding a reactant to a reactor, the reactant including ethanol. The reactant may further include water in the form of steam. The reactant is introduced to a perovskite catalyst in the reactor. The perovskite catalyst promotes the formation of the higher carbon compounds from ethanol, and may be in the form of a powder or thin film. The perovskite catalyst has the formula ABO3, wherein A is one or more selected from a group consisting of La and Sr, and wherein B is one or more selected from a group consisting of Mn, Ca, Fe, and Co. The perovskite catalyst particularly may be La0.7Sr0.3MnO3. The obtained higher carbon compounds may include at least one of acetone and crotonaldehyde.

The invention relates to application of a rare earth-based catalyst. The application comprises the step of carrying out hydrogenation reaction on hydrogenation raw materials in the presence of the supported catalyst Ir / CeO2 to obtain alcohol, wherein the hydrogenation raw material is selected from one or more of furfural, 5-hydroxymethylfurfural, 5-methylfurfural, m-tolualdehyde, benzaldehyde, phenylacetaldehyde, phenylpropionaldehyde, p-fluorobenzaldehyde, cinnamyl aldehyde, cinnamyl alcohol, cyclobutanone, cyclopentanone, cyclohexanone, cycloheptanone, tetrahydropyran-4-ketone, tetrahydrothiapyran-4-ketone, crotonaldehyde and terephthalaldehyde; the catalyst is prepared by a method comprising the following steps: mixing a CeO2 carrier with a solution containing a metal Ir precursor, and reacting under heating and alkaline conditions to obtain a catalyst precursor; and calcining and reducing the catalyst precursor to obtain the supported catalyst Ir / CeO2. The rare earth-based catalyst is simple in preparation process, mild in condition, high in hydrogenation activity and good in stability.

The application relates to the field of crotonal production synthesis, and particularly discloses a production process of crotonal. The production process adopts calcium-based hydrotalcite solid alkali as a catalyst to make acetaldehyde generate butanol aldehyde through condensation reaction, then makes the butanol aldehyde generate crude crotonal through dehydration reaction under the action of acetic acid, and finally processes the crude crotonal through primary distillation and rectification to obtain crotonal products. The production method has the advantages of high yield and high purity of crotonal products, small corrosion to equipment, simple process steps, mild reaction conditions, reusable catalyst, low production cost and suitability for large-scale industrial production.

The invention discloses a preparation method of a sorbic acid condensation catalyst and application of the sorbic acid condensation catalyst in preparation of sorbic acid, and belongs to the technical field of chemical engineering. In the preparation process of the sorbic acid condensation catalyst zinc acetylacetonate, crotonaldehyde is adopted as a solvent, the reaction speed of acetylacetonate and zinc oxide can be greatly increased, water generated in the reaction process is not mutually soluble with crotonaldehyde, and continuous water distribution can be achieved; and the zinc acetylacetonate has high solubility in the crotonaldehyde, so that the zinc acetylacetonate in the prepared crotonaldehyde solution containing the zinc acetylacetonate has high concentration. After being diluted by adding fresh crotonaldehyde subsequently, the product can be directly used as a raw material and conveyed to a condensation section, so that the original steps of preparing a catalyst finished product and feeding a powdery catalyst are omitted, the energy consumption is greatly reduced, and the environmental protection and safety problems caused by dust and tail gas in the feeding process are solved; and the overall space and the use efficiency of the device are improved.

The invention belongs to the technical field of catalytic synthesis, and discloses a catalyst for preparing crotonaldehyde through ethanol dehydrogenation and a preparation method and application thereof.The catalyst takes SiO2 as a carrier, active components comprise copper and auxiliary metal, the mass ratio of the copper is 10-25%, the auxiliary metal is one or more of chromium, cerium, lanthanum, zirconium and zinc, and the mass ratio of the auxiliary metal is 0.5-5%. The catalyst is prepared by adopting a sol-gel method, copper nitrate, a nitrate auxiliary agent and tetraethoxysilane are taken as precursors, urea is taken as a precipitator, and the catalyst is prepared through hydrothermal reaction, filtering, drying, roasting and hydrogen reduction, the preparation process of the catalyst is simple, the cost is controllable, the reaction does not need to be performed step by step, the problems of limited raw materials, multiple side reactions and the like in a traditional process are solved, and the catalyst is suitable for industrial production. The method has high activity and high selectivity, provides a new path for green and efficient synthesis of crotonaldehyde, and is suitable for industrial popularization and application.

Provided is a method capable of manufacturing high-purity 1,3-butylene glycol having a high potassium permanganate test value, a very low content of low boiling point components, and a high initial boiling point with a high recovery rate.The method for manufacturing 1,3-butylene is a method for obtaining purified 1,3-butylene glycol from a crude reaction liquid containing 1,3-butylene glycol. In a dehydration column used in a dehydration step, a liquid feed containing 1,3-butylene glycol and water with an acetaldehyde content of 1000 ppm or lower and a crotonaldehyde content of 400 ppm or lower is distilled under a condition of a reflux ratio of higher than 0.3, and a liquid concentrated with a low boiling point component containing water is distilled off from above a feed tray. In a product column used in a product distillation step, a 1,3-butylene glycol liquid feed with an acetaldehyde content of 500 ppm or lower and a crotonaldehyde content of 200 ppm or lower is distilled under a condition of a reflux ratio of higher than 0.1.

The invention relates to a method for producing butanol from ethanol, said method comprising the following steps: (i) reacting aqueous ethanol to form acetaldehyde in the presence of a ruthenium oxide catalyst, (ii) reacting the formed acetaldehyde to form a crotonaldehyde, (iii) reacting the formed crotonaldehyde to form butanol. In each of the steps (i), (ii) and (iii), an aqueous phase is present.

The invention relates to the technical field of organic synthesis, in particular to a synthesis method of high-purity clethodim, which comprises the following steps: mixing modified crotonaldehyde and modified methyl acetoacetate for condensation reaction to prepare intermediate feed liquid; introducing nitrogen into the intermediate feed liquid for protection and dehydration to prepare a dehydrated intermediate; carrying out acylation and transposition reaction on the dehydrated intermediate to prepare propionyl triketone feed liquid; mixing a propionyl triketone feed liquid with the modified chlorinated allyloxyamine, adding a stabilizer, carrying out oximation reaction in a fourth microchannel reactor, and after the reaction is finished, carrying out cooling recrystallization, filtering and drying post-treatment to obtain the high-purity clethodim. By adopting a microchannel reactor continuous flow process and combining targeted modification treatment on three raw materials, namely crotonaldehyde, methyl acetoacetate and chloro-allyloxyamine, the conversion efficiency of each step of reaction is improved, the reaction conditions are mild, the process is controllable, the product purity is relatively high, the yield is stable, and meanwhile, side reactions are reduced.

The present application relates to the field of water treatment, and discloses a strain capable of degrading crotonaldehyde, a complex bacterial population and application thereof in water treatment. The present application provides a strain of Bacillus tequilensis H21, which can simultaneously and efficiently degrade crotonaldehyde and COD in wastewater, and the strain also has very high tolerance to high-concentration crotonaldehyde production wastewater, and thus can be applied to the treatment of high-concentration and high-toxicity crotonaldehyde production wastewater, thereby reducing the load on the subsequent biochemical treatment system and improving the biochemical treatment efficiency. Further, after alkali pretreatment of high-concentration and high-toxicity crotonaldehyde wastewater, fermentation treatment is performed by using Bacillus tequilensis H21 or a complex bacterial population containing Bacillus tequilensis H21, which can further reduce the toxicity of the wastewater, thereby reducing the load on the subsequent biochemical treatment system of the wastewater after biological pretreatment and improving the biochemical treatment efficiency.

Provided are: a resin composition containing an ethylene-vinyl alcohol copolymer (EVOH), the resin composition allowing for inhibition of neck-in and die buildup at a time of melt molding; and the like.The resin composition contains: an ethylene-vinyl alcohol copolymer (A) having an ethylene unit content of 20 mol % or more and 60 mol % or less; and crotonaldehyde (B1), wherein the resin composition further comprises at least one selected from the group consisting of 2,4-hexadienal (B2) and 2,4,6-octatrienal (B3), and the following inequalities (1) and (2) are satisfied. In the inequalities (1) and (2): b1 represents a content (ppm) of crotonaldehyde (B1) with respect to the ethylene-vinyl alcohol copolymer (A); b2 represents a content (ppm) of 2,4-hexadienal (B2) with respect to the ethylene-vinyl alcohol copolymer (A); and b3 represents a content (ppm) of 2,4,6-octatrienal (B3) with respect to the ethylene-vinyl alcohol copolymer (A).2.≤b1 / (b2+b3)<150.(1)b2+2⁢b3≤0.65.(2)

The invention discloses tipping paper capable of reducing the release amount of harmful ingredients in smoke and a preparation method of the tipping paper. The tipping paper comprises modified cellulose fiber body paper, upper-layer breathable tipping paper body paper and lower-layer breathable tipping paper body paper, the modified cellulose fiber base paper is prepared by introducing a compound containing a plurality of amido groups on an alcoholic hydroxyl group on a cellulose macromonomer for modification and further doping calcium chloride and activated carbon powder; a first gluing layer is arranged between the modified cellulose fiber body paper and the lower breathable tipping paper body paper, a second gluing layer is arranged between the modified cellulose fiber body paper and the upper breathable tipping paper body paper, the modified cellulose fiber body paper is not completely covered with the first gluing layer and the second gluing layer, and the uncovered area serves as a breathable area. The tipping paper disclosed by the invention can effectively reduce the release amount of various harmful ingredients in smoke, and the reduction effect on ammonia gas, phenol and crotonaldehyde is obviously improved.

The invention relates to the technical field of chemical synthesis, in particular to a high-efficiency environment-friendly paraldehyde polycondensation process which comprises the following steps: in polycondensation pretreatment, putting a gel additive into a reaction kettle and externally applying a magnetic field; loading a liftable film material; acetaldehyde, a catalyst aqueous solution and a functional auxiliary agent are added in the polycondensation treatment for reaction; adding calcium oxide after polycondensation; according to the preparation method, pyridine hydrochloride and zinc bromide are introduced into the functional additive, the pyridine hydrochloride is combined with hydrobromic acid to inhibit generation of a linear polymer and crotonaldehyde, the zinc bromide is cyclized through a coordination guide reaction, the pyridine hydrochloride and the zinc bromide cooperate to provide double active centers of Lewis acid and Bronsted acid, the trimerization selectivity is remarkably improved, and the yield of the paraldehyde is increased. And the gel additive has selective recognition and adsorption effects on the crotonaldehyde precursor and effectively inhibits side reactions, and meanwhile, green and efficient synthesis of high-purity paraldehyde is realized by combining a multi-section temperature control process and calcium oxide neutralization.

The invention relates to the technical field of chemical synthesis, in particular to a synthesis method and application of asymmetric 1, 10-phenanthroline. The synthesis method of the asymmetric 1, 10-phenanthroline, provided by the invention, comprises the following steps: reacting 8-aminoquinoline and crotonaldehyde under the acidic condition and the catalytic action of NaI to obtain an intermediate 1; carrying out oxidation reaction on the intermediate 1 under an acidic condition to obtain an intermediate 2; and reacting the intermediate 2 with phosphorus oxyhalide to obtain the asymmetric 1, 10-phenanthroline. According to the synthesis method of the asymmetric 1, 10-phenanthroline, through three-step efficient reaction, the synthesis period is short, the production efficiency is high, the used raw materials are easy to obtain and low in cost, a convenient and efficient synthesis means is provided for researchers, and the asymmetric 1, 10-phenanthroline modification method and substrate range are widened; meanwhile, the method is suitable for large-scale industrial production and meets the large demand of the market on the phenanthroline derivative.

The invention discloses an acid-base bifunctional hybrid catalyst for synthesizing crotonaldehyde and a preparation method of the acid-base bifunctional hybrid catalyst. According to the catalyst, mesoporous silica is used as a carrier, and aluminum species serving as Lewis acid sites and organic amido serving as alkaline sites are modified on the surface and in pore channels of the carrier through chemical bonds in a contemporaneous manner. The surface of a pore channel of the carrier is modified with Lewis acid sites and organic amine alkaline sites in time through chemical bonds, the alkaline sites efficiently catalyze condensation of acetaldehyde to generate 3-hydroxybutyraldehyde, and adjacent Lewis acid sites immediately promote dehydration of acetaldehyde to generate crotonaldehyde, so that efficient proceeding of cascade reaction is realized. Meanwhile, the catalyst is prepared through stable chemical bonding, active components are not prone to loss, and the catalyst has excellent stability.

The present application relates to a method and device for producing crotonaldehyde by Zr-beta molecular sieve catalytic gas phase acetaldehyde, and the process is used for producing crotonaldehyde by Zr-beta molecular sieve catalytic gas phase acetaldehyde. Through condensation reaction, heat exchange system, acetaldehyde recovery system, crotonaldehyde refining system and azeotrope separation system, the production of high-purity crotonaldehyde is realized, replacing the traditional homogeneous method using strong acid and strong base catalyst, avoiding the corrosion of the equipment, greatly increasing the service life of the equipment, and reducing the investment cost. The present application uses a packed fixed bed reactor, completely solves the problem of using sodium hydroxide catalyst in the traditional process, and the wastewater contains a large amount of sodium salt, which is not friendly to the environment. The steam out MCP process is proposed, the process is optimized, and the energy consumption is reduced. The selectivity of the main product crotonaldehyde is maintained between 90% and 95%.