1356 results about "Acrolein" patented technology

A composite metallic oxide as catalyst for selective oxidization of unsaturated aldehyde, especially the acrylaldehyde or methyl acrylaldehyde to obtain acrylic acid or methyl acrylic acid, is composed of active components (Mo, V and Cu), stabilizer (at least Sb and Ti) and the composite oxide of Ni, Fe, Si, Al, alkali metal and alkali-earth metal. Its preparing process is also disclosed.

An electric smoking system includes a cigarette including a cylindrical tobacco web partially filled with tobacco material to define a filled tobacco rod portion and an unfilled tobacco rod portion, and an electric lighter. The wrapper includes a filler of ammonium-containing compounds effective to reduce the gaseous constituents of the smoke produced during smoking. The system includes a pilot burner including at least one heating vane and a controller adapted to control heating of the heating vane. The lighter is configured to at least partially contain the cigarette such that the heater blade heats the heating region of the cigarette. Manipulating the controller to limit the heating of the heater blades to a predetermined temperature range which allows the delivery of the smoke generated when the portion of the tobacco rod is heated while at least reducing the amount of smoke present in the smoke as compared to smoking a cigarette having only calcium carbonate as filler. A gaseous component. The gaseous components that can be reduced include carbon monoxide, 1,3 butadiene, isoprene, acrolein, acrylonitrile, hydrogen cyanide, 0-toluidine, 2-naphthylamine, nitrogen oxide, benzene, NNN, Phenol, catechol, benzanthracene and benzopyrene.

The present invention provides catalyst for selectively oxidizing methyl acrolein to synthesize methylpropenoic acid and its usage in catalyzing gas phase oxidation of methyl acrolein to synthesize methylpropenoic acid. The catalyst is one heteropoly acid salt containing Mo, P, K, Sb, Cu, As, etc., and has high catalytic activity and stability, long service life, methyl acrolein converting rate higher than 85 % and methylpropenoic acid selectivity over 87 % in the presence of molecular oxygen and diluting gas.

The present invention relates to a process for manufacturing acrolein by dehydration of glycerol in the presence of molecular oxygen. The reaction is performed in the liquid phase or in the gas phase in the presence of a solid catalyst. The addition of oxygen makes it possible to obtain good glycerol conversion by inhibiting the deactivation of the catalyst and the formation of by-products.

The invention relates to a preparation method of a catalyst for acrylic acid by oxidizing acraldehyde, which is characterized by comprising the following steps of: dispersing water soluble metal salts containing the components of Mo, V, W, Cu and Sb into a water / organic phase mixed system at the temperature of 30-100DEG C; maintaining the weight ratio of an organic solvent to water as 5-50 percent; reacting to generate composite oxide precursor serum; separating water by a distilling process under the condition of continuously supplementing organic phases at the temperature of 20-120DEG C, wherein the water content of distillate is not greater than 10 percent; then, pelleting by a spray drying process and roasting at the temperature of 200-600DEG C to prepare catalyst active components; mixing primary roasting powder, a forming additive and a strength improver; coating the active components on the surface of an inert carrier by using an adhesive, wherein the carrying capacity occupies5-70 percent of the total quantity of the catalyst; drying a formed product for 5-48 hours at room temperature; and then, roasting the formed product for 1-15 hours at the temperature of 200-600DEG Cto obtain a spherical catalyst with the active components carried on the inert carrier.

An improved method for the selective vapor phase oxidation of propylene to acrolein in a recirculating solids reactor system using a bismuth molybdate multimetal oxide involving specific reactant concentrations (preferably 5 mol % to 30 mol % propylene, 0 to 20 mol % oxygen, and the remainder inert gas), particle size (1 to 300 micrometers), temperature (250 to 450.degree. C.) and gas (1 to 15 seconds) and solids (2 to 60 seconds) residence times. Such a process leads to improved selectivity and propylene conversion.

The invention discloses a method for preparing a catalyst for acrolein and acrylic acid, which is characterized in that: the catalyst consists of an active component supporter and an inert alumina carrier; the main composition elements of the active component are selected from Mo, Bi, Co and / or Ni and Fe, and the active component also contains trace elements such as K, Na, Rb, Cs, Mg, Ca, Zn, B, P and W; the active component supported on the carrier accounts for 5 to 70 percent of the total weight of the catalyst; and the active component supporter is not prepared by coprecipitation, instead, initial raw materials of the elements of the above expression formula containing the active component are precipitated in aqua ammonia of ammonium molybdate step by step to prepare an active component precursor with core-shell distribution, and the active component precursor is dried and baked to prepare the active component.

In a process for preparing water-absorbent resins based on acrylic acid, crude acrylic acid is firstly isolated from the reaction gases from the catalytic gas-phase oxidation of propane, propylene and / or acrolein. This is treated with an aldehyde scavenger and pure acrylic acid is separated by distillation from the treated crude acrylic acid, and this pure acrylic acid can be subjected directly to a free-radical polymerization.

A process for regenerating a catalyst used in the preparation of acrolein from glycerol, which comprises tungsten compounds and has acidic properties and at least one promoter.

Complex oxide catalysts represented by the formula,(in which A is Ni or Co; B is Na, K, Rb, Cs or Tl; C is an alkaline earth metal; D is P, Te, Sb, Sn, Ce, Pb, Nb, Mn, As, B or Zn; E is Si, Al, Ti or Zr; and where a is 12, 0<=b<=10, 0<c<=10, 0<d<=10, 2<=e<=15, 0<f<=10, 0<=g<=10, 0<=h<=4 and 0<=i<=30)are provided. The catalysts are characterized in that the molar ratio of the total nitrate anions to the molybdenum at the time of catalyst preparation is more than 1 but not more than 1.8. When used in the reaction for producing (meth)acrolein and (meth)acrylic acid by vapor-phase oxidation of at least a compound selected from propylene, isobutylene, t-butanol and methyl-t-butyl ether, the catalysts exhibit excellent activity and selectivity and maintain stable performance over prolonged period.

An oxidation reactor includes a reactor body, a manhole nozzle projecting from the reactor body, and a partition plate separating an inside of the manhole nozzle and an inside of the reactor body from each other. In an oxidation reactor including the reactor body and a nozzle projecting from the reactor body, there is provided a means for feeding an inert gas into the nozzle. In a process for producing (meth)acrylic acids by subjecting propane, propylene or isobutylene to catalytic gas-phase oxidation reaction in an oxidation reactor for producing (meth)acrolein or (meth)acrylic acid, the above oxidation reactor is used as the oxidation reactor. In a method for analyzing an easily-polymerizable compound by introducing a gas containing the easily-polymerizable compound into an analyzing apparatus through a sampling tube, a double tube is used as the sampling tube, and a heating medium is fed into an outer tube of the double tube. According to these methods, the oxidation reaction can be stably conducted, and the reaction product gas can be prevented from being condensed and polymerized in the sampling tube, so that an on-line analysis can be performed at a high accuracy for a long period of time.

3-Hydroxypropanal is prepared by reacting acrolein with water under pressure and in the presence of an ion exchange resin while adding a carboxylic acid to the reaction mixture.

The present invention relates to a multiple catalyst system for preparing unsaturated aldehydes and acids from reactive hydrocarbons at high reactive hydrocarbon space velocity conditions. The present invention also relates to a process for preparing unsaturated aldehydes and acids from reactive hydrocarbons using the multiple catalyst system at high reactive hydrocarbon space velocity conditions. In one embodiment, the multiple catalyst system is utilized in a vapor phase catalytic oxidation reaction process which produces acrolein and acrylic acid from propylene at high reactive hydrocarbon space velocity conditions.

The invention relates to a multifunctional preparation for controlling biological corrosion and blockage of an oilfield production system. The contents of functional preparations in the treating water are as follows: 20 to 200 ppm of disinfectant: glutaraldehyde, acrolein, dodecyldimethylbenzyl ammonium chloride or dodecyldimethylbenzyl ammonium bromide, 10 to 100 ppm of inhibitor: sodium nitrateor sodium nitrite; and / or 10 to 20 ppm of sodium molybdate, sodium tungstate or lithium molybdate; 10 to 20 ppm of corrosion inhibitor: imidazoline quaternary ammonium; or / and 20 to 50 ppm of desulphurizing reagent: trihydroxymethyl nitromethane; or / and 10 to 20 ppm of penetrating agent: alkylpheol ethoxylates. The components undergo synergistic action so that the concentration of the single component is reduced obviously and reaches 25 to 90%, and the efficiency of killing the SRB (Sulfate Reducing Bacteria) reaches more than 90%.

A cigarette comprises a tobacco rod and a carbon-on-tow filter comprising a fiber tow with flavored or unflavored carbon particles distributed throughout the tow. The carbon particles have high activity in the range of 90 to 115%, preferably 95%. As mainstream smoke is drawn through the filter, gas phase smoke constituents are removed and flavor is released when the particles are flavored. Ventilation is provided to limit the amount of tobacco being combusted during each puff and such ventilation is arranged at a location near the downstream end of the carbon-on-tow filter to lower mainstream smoke velocity through the filter. The filter achieves significant reductions in gas phase constituents of mainstream smoke, including 90% reductions or greater in at least one of 1, 3 butadiene, acrolein, isoprene, propionaldehyde, acrylonitrile, benzene, toluene, and 80% reductions or greater in acetaldehyde over extended shelf life of the cigarettes.

An ester-forming monomer obtained by depolymerization of polytrimethylene terephthalate and having an acrolein content of no greater than 0.5 wt %. Polymers obtained using the monomer and fibers, films and molded articles comprising the polymers. The ester-forming monomer is obtained by reacting polytrimethylene terephthalate with at least one compound selected from among monoalcohols, 1,3-propanediol and water in the presence of a basic substance. When the recovered ester-forming monomer is used as the starting material for production of a polymer, it is possible to produce a molding polymer for fibers, films and the like with quality equivalent to or higher than that obtained using virgin monomer.

A fatty acid alkyl ester of the general formula I:and acrolein are prepared by reacting a triglyceride of the general formula II:wherein a) the triglyceride is reacted using an alcohol R′—OH in the presence of a catalyst to give said fatty acid alkyl ester and glycerol; and b) the glycerol is dehydrated catalytically to acrolein, wherein R is R1, R2 and R3, and R1, R2 and R3 are all the same or some are the same or all are different and are each a straight-chain or branched, and optionally mono- or polyunsaturated C10-C30-alkyl radical, and R′ is a C1-C10-alkyl radical or a C3-C6-cycloalkyl radical.

The present invention provides a kind of catalyst for selectively oxidizing tertiary butanol or isobutene to synthesize methyl acrolein and its preparation process and application in gas phase catalytic oxidizing synthesis of methyl acrolein. The catalyst of the present invention is one kind of composite oxide containing Mo, Bi, Fe, Co, Sb, Pb, Yb, etc. and has high catalytic activity and stability, long service life, isobutene converting rate higher than 95 % and methyl acrolein selectivity over 86 % in the presence of molecular oxygen.

The present invention relates to a method for preparing a catalyst for partial oxidation of propylene, particularly a method for preparing a catalyst for preparing an acrylic acid, using an organic acid such as a citric acid, maleic acid and oxalic acid. The complex oxide catalyst according to the invention, when used in the gas phase catalytic oxidation of propylene, may produce acrolein in high yield.

A heteropolyacid catalyst for oxidation of isobutyraldehyde, methacrolein or mixtures or combinations thereof to methacrylic acid is disclosed where the heteropolyacid catalyst includes at least molybdenum (Mo), phosphorus (P), vanadium (V), and a first component including bismuth (Bi) and / or boron (B). The heteropolyacid catalyst can also optionally include a second component including potassium (K), rubidium (Rb), cesium (Cs), and / or thallium (Tl) and optionally a third component including antimony (Sb), cerium (Ce), niobium (Nb), indium (In), iron (Fe), chromium (Cr), cobalt (Co), nickel (Ni), manganese (Mn), arsenic (As), silver (Ag), zinc (Zn), germanium (Ge), gallium (Ga), zirconium (Zr), magnesium (Mg), barium (Ba), lead (Pb), tin (Sn), titanium (Ti), aluminum (Al), silicon (Si), tantalum (Ta), tungsten (W), and / or lanthanum (La). The heteropolyacid catalyst can also include an ammonium-containing compound designed to increase a value of medium pores in the final heteropolyacid catalyst. A method for oxidizing isobutanal to methacrylic acid using the heteropolyacid catalyst is also disclosed.

Smoking articles and filters, which involve the use of carbon-coated molecular sieve sorbents are provided. The carbon-coated molecular sieve sorbent has a carbon coating within pores of a mesoporous molecular sieve. The carbon-coated molecular sieve sorbent provides selective adsorption of one or more constituents from mainstream smoke, such as acrolein or 1,3-butadiene. Thus, certain constituents from cigarette smoke will be selectively removed, while maintaining other constituents, such as those that contribute to flavor. Methods for making cigarette filters and smoking articles using the carbon-coated molecular sieve sorbent, as well as methods for smoking a cigarette comprising the carbon-coated molecular sieve sorbent, are also provided.

The invention relates to a catalyst for preparing an unsaturated acid from an unsaturated aldehyde by oxidization and a preparation method of the catalyst. The invention mainly solves the problems of low reaction yield and low selectivity of unsaturated acid in the catalyst in the prior art. The technical scheme is as follows: at least one of SiO2, Al2O3 and TiO2 is selected as a carrier; and the catalyst contains the active component illustrated by the general formula Mo12VaCubXcYdZeOx, wherein X is selected from at least one of W, Cr and Nb, Y is selected from at least one of Fe, Bi, Sb, Ce, La, Zr and Th, and Z is selected from at least one of alkali metals or alkaline earth metals. By using the technical scheme of the invention, the problems are solved. The catalyst can be used for industrially producing acrylic acid or methacrylic acid from acrolein or methacrolein by oxidization.

The invention discloses a CsPW / Zr-MCM-41 catalyst prepared in a supercritical CO2 environment. The preparation method comprises the following steps: Zr-MCM-41 is taken as the carrier, and 10-60% of Cs modified salts is loaded by adopting the supercritical CO2 impregnation technology; with the utilization of the catalyst, the glycerin conversion rate reaches 65.2-100%, the acrolein selectivity reaches 56.8-85.4%; the invention further discloses application of the CsPW / Zr-MCM-41 catalyst to preparation of acrolein through glycerol selective dehydration. Compared with the prior art, the catalyst prepared by adopting the preparation method has the advantages that the dispersion degree of Cs modified salt on the carrier is high, the acting force between the Cs modified salt and the carrier is strong, the hydrothermal stability is high, the acidity loss possibility is low, and meanwhile, when compared with the conventional product, the obtained product is high in glycerin conversion rate and acrolein selectivity, and long in service life.

A method for measuring main carbonyl compounds in a main stream smoke of a cigarette through ultra high performance convergence chromatography is a method for measuring butyraldehyde, 2-butanone, propionaldehyde, crotonaldehyde, acrolein, acetone, acetaldehyde and formaldehyde in the main stream smoke. The method is characterized in that a filter leaf processed with a derivatization reagent is used to gather the main carbonyl compounds in the main stream smoke of the cigarette, the analyzing and measuring method is used to obtain the contents of the eight carbonyl compounds in the main stream smoke through ultra high performance convergence chromatography (UPC2). When the method provided by the invention is used to detect the contents of the main carbonyl compounds in the main stream smoke of the cigarette rapidly and effectively, the pretreatment is simple, the average relative standard deviation is less than 7%, and the average recovery rate of various indexes is between 75%-94%. The method has the advantages of rapidness, accuracy, high flexibility and good repeatability.

A process for preparing acrolein from glycerol using an acidic solid-state catalyst which comprises tungsten compounds and further promoters.

The invention relates to a method for detecting eight volatile carbonyl compounds in a filter tip through liquid chromatography-tandem mass spectrometry. The eight volatile carbonyl compounds are formaldehyde, acetaldehyde, propanal, acetone, acraldehyde, crotonaldehyde, butanal and 2-butanone. The method comprises the following steps: performing ultrasonic extraction on the carbonyl compounds in a filter tip by using an acetonitrile / water mixed solution, performing 2,4-dinitrophenylhydrazine derivatization reaction, and analyzing through a liquid chromatography-tandem mass spectrometer (LC-MS / MS). Compared with the original gas chromatography, the LC-MS / MS method used in the method has the following advantages: (1) the LC-MS / MS method is higher in sensitivity, and the two-stage mass spectrometry can more effectively eliminate the false positive result, thus ensuring that the qualitative analysis accuracy is higher; (2) separation is performed through liquid chromatography, and 2,4-dinitrophenylhydrazone of the carbonyl compounds has favorable stability; (3) the sample does not need to be purified, and the pretreatment is simple and efficient; and (4) the method can realize the simultaneous detection of the eight volatile carbonyl compounds.

The present invention relates to preparation process of phosphine oxamate and its derivatives, and is especially preparation process through Michael addition reaction of methyl phosphinate and acrylaldehyde. The present invention features the condensing agent for the reaction of proper weak acid and the three step reaction for preparing phosphine oxamate product. Adopting weak acid as the condensing agent can obtain high yield and high purity of phosphine oxamate product. Adopting weak acid as the condensing agent to replace anhydride and using no alcohol can lower the production cost.

The present invention relates to the field of organic chemistry, particularly to a method for preparing acrolein through catalysis of glycerol liquid phase dehydration by using an imidazole ion liquid. According to the method, an imidazole ion liquid is adopted as a catalyst, a semi-batch reaction is adopted, and glycerol liquid phase dehydration is performed at a reaction temperature of 250-350 DEG C and a molar ratio of the ion liquid to the glycerol of 0.1:100-1.5:100 to prepare the acrolein, wherein a glycerol conversion rate is 100%, and an acrolein yield is 30.5-68.2%. According to the present invention, the biomass glycerol is adopted to prepare the high added value acrolein, raw material cost is low, raw material sources are wide, acidity of the catalyst can be adjusted, catalytic activity is high, and the process has characteristics of fast reaction, high selectivity, simple product system separation, safe and environmental protection process, and industrial production.

The invention relates to an unsaturated aldehyde catalyst prepared by oxidizing olefin and a preparation method thereof, and mainly solves the problems of low reaction yield and selectivity of target products unsaturated aldehyde and unsaturated acid in the prior art. The catalyst takes at least one of SiO2 and Al2O3 as a carrier, and contains active ingredients shown as a formula Mo12BiaFebNicXdYeZfQqOx, wherein X is at least one of Mg, Co, Ca, Be, Cu, Zn, Pb and Mn; Y is at least one of Zr, Nb and Ti; Z is at least one of K, Rb, Na, Li, Cr, Tl and Cs; and Q is at least one of La, Ce, Sm andTh. Through the technical scheme, the catalyst and the preparation method thereof well solve the problems and can be used for the industrial production of acrolein or methacrolein prepared by oxidizing propylene or isobutylene.