37 results about "Acrylic aldehyde" patented technology

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 invention discloses a preparation method of acrolein, taking biological glycerol as the raw material and the modified zeolite supported heteropolyacid as catalyst, the method prepares acrolein directly by dehydration reaction. 18 to 30 catalyst are put in the middle section of a normal pressure continuous fixed bed reactor, with the volume space velocity of 1 to 10 h<-1>; under the protection of N2, the catalyst bed raises the temperature to 180 to 540 DEG C, and the biological glycerol solvent which is added with inhibitor is put into the fixed bed reactor from a micro pump; after gasified, the glycerine solution reacts by the catalyst bed. After reaction, the product is absorbed by acetone, then is separated and purified, thus obtaining acetone. The invention adopts the alkali metal, phosphoric oxides, alkali metal compound improved catalyst as carrier to carry heteropoly acid catalyst which is green and environmental catalyst and has the advantages of high activity, regeneration property, no pollution, simple reaction, operation process, low production cost, high mole selectivity of acrolein and high conversion rate of biological glycerol.

The invention relates to an alpha-beta unsaturated aldehyde catalyst prepared by an olefin oxidation method and a preparation method thereof. The problems of low selectivity and low yield of a target product in the prior art are mainly solved. The problems are well solved according to the technical scheme that: an active ingredient shown as the general formula Mo12BiaFebNicXdYeZfOx is adopted, wherein X is selected from at least one of Mg, Co, Ca, Be, Cu, Zn, Pb and Mn; Y is selected from at least one of K, Rb, Na, Li, Tl and Cs; Z is at least one of La, Ce and Sm; and a pore forming compoundis added in the preparation process of the catalyst. The catalyst can be used in the field for industrially producing acrylic aldehyde and methyl acrylic aldehyde by oxidizing propylene and isobutene.

The invention relates to a maotai-flavour liquor treatment method and belongs to the technical field of maotai-flavour liquor production. The maotai-flavour liquor treatment method comprises the following steps of: (1) powder activated carbon adsorption, namely adding activated carbon with the weight equivalent to 0.1-0.15% of that of wine and the pore size of 2-5nm into maotai-flavour liquor, standing for 24 hours, extracting a sample, observing suspension or sedimentation degree of the activated carbon in the wine, if the activated carbon completely sedimentates in the wine, then adding the activated carbon with the weight equivalent to 0.1-0.125% of that of the wine and the pore size of 2-5nm, and standing for 48 hours; and (2) storing at constant temperature and humidity, namely filtering the maotai-flavour liquor treated by the activated carbon in the step (1) into a pottery jar in an underground spirit room by adopting a diatomite filtering machine, and carrying out constant temperature and constant humidity storage under the conditions that the temperature is 15-20 DEG C generally, the humidity is 80-85% and the storage period is about 3-4 months. According to the maotai-flavour liquor treatment method, powder activated carbon adsorption and constant temperature and humidity storage environment are combined and utilized in a maotai-flavour liquor treatment process, acrylic aldehyde, sulphide and the like are removed, turbidity removal, edulcoration and catalysis ageing are carried out, ageing of the wine is sped up, and maotai-flavour liquor ageing accelerating treatment is realized.

The invention discloses a process for preparing acrylic aldehyde by using selective glycerol dehydration and a preparation method of a catalyst thereof. Heteropolyacid/a carrier is disclosed in the expression of the catalyst, wherein the heteropolyacid is one of silicotungstic acid, phosphotungstic acid and phosphomolybdic acid, and the carrier is one of activated aluminium oxide, kieselguhr, activated carbon, rutile type titanium dioxide and kaoline. The catalyst is prepared by using a constant-pore volume dipping method. When the catalyst is used in a fixed-bed miniature reaction device, the transformation rate of glycerol is 13.5%-80.6%, and the selectivity of the acrylic aldehyde is 49.0%-90.5%. When used for carrying out the process for preparing acrylic aldehyde by using glycerol dehydration, the catalyst has the advantages of high catalyst activity, high reaction speed, high selectivity for the acrylic aldehyde and the like, and the main byproduct is hydroxyl acetone.

The invention relates to a catalyst used in preparation of (methyl) acrylic aldehyde and (methyl) acrylic acid. The catalyst is a composite oxide catalyst containing molybdenum, bismuth and iron, which is mainly used for selective oxidation of propylene or isobutene (tert-butyl alcohol) for producing the (methyl) acrylic aldehyde and (methyl) acrylic acid. Oxide nanocrystals are added during the preparation of the catalyst to not only play a part in adjusting the alkalinity or acidity of the catalyst so as to improve the selectivity of the (methyl) acrylic aldehyde and (methyl) acrylic acid and reduce the yield of carbon oxide serving as the byproduct but also enhance the mechanical strength of the catalyst; thus the invention is suitable for the preparation of an industrial catalyst and industrial application for a long period.

The invention relates to a method for preparing acrylic aldehyde, and particularly discloses a method for preparing acrylic aldehyde by catalytic conversion of glycerin. The technical problems of high temperature requirement and low yield of a conventional acrylic aldehyde preparation method are solved. The method for preparing the acrylic aldehyde by catalytic conversion of the glycerin comprises the following steps: (1) preparing a 10 to 20 weight percent solution from the glycerin and an inert organic solvent, and then adding a catalyst to prepare a reaction system, the addition of the catalyst being 1 to 5 weight percent of the solution prepared from the glycerin and the inert organic solvent; (2) enabling the reaction system to perform reaction at 150 to 180 DEG C, and condensing and collecting generated acrylic aldehyde until no acrylic aldehyde is generated from the reaction system. According to the method, another solvent which is low in viscosity and has an inert chemical property is added into the reaction system, so that the viscosity of the system can be reduced, the diffusion rate of the acrylic aldehyde can be increased, meanwhile, the concentration of the glycerin can be diluted, the concentration of hydroxyl in the system can be reduced, the reaction probability of the acrylic aldehyde can be reduced, and the selectivity of the acrylic aldehyde can further be improved.

The invention discloses a tetranitrodocosyl heterocyclic ring chromatographic stationary phase. A preparation method includes: using hydrochloric acid to acidize porous spherical silica gel for chromatography, and water washing to neutral to realizing activation of the surface of silica gel; utilizing closed ring reaction to enable docosyl heterocyclic ring ligand generated by reaction of acrylic aldehyde and hexamethyldiamine to react with gamma-isocyanatepropyltriethoxy silane, and modifying a synthetic silane heterocyclic ring on the surface of a silica gel carrier to realize high efficiency and high selectivity of the stationary phase. The tetranitrodocosyl heterocyclic ring chromatographic stationary phase prepared by the method has excellent physical structure of silica gel matrix and has special chromatographic performance of nitrogen containing micro-ring; a structure of multi-nitrogen multi-alkyl heterocyclic ring long chain is bonded on the surface of silica gel, so that the stationary phase has high hydrophobicity and has certain hydrophilicity, thereby having high separating performance on pesticide residue (polycyclic aromatic hydrocarbons, phenols and amine); chromatographic analysis conditions after optimization are simpler and more convenient and easy to operate, so that application prospect is quite good.

The invention discloses a phosphoric acid modified montmorillonite loaded tungsten oxide catalyst, a preparation method and application.The preparation method includes: using a phosphoric acid solution to modify montmorillonite, and adopting a soaking method to load tungsten oxide on phosphoric acid modified montmorillonite, wherein active species are H+ among montmorillonite layers, Al3+ outside a montmorillonite framework and WOx with different tungsten-oxygen atom coordination structures, and x is greater than or equal to 2.7 and less than or equal to 3; soaking phosphoric acid modified montmorillonite in a water solution of ammonium tungstate hydrate, oxalate dihydrate and low carbon, drying, and baking to obtain the phosphoric acid modified montmorillonite loaded tungsten oxide catalyst.The catalyst can be used for catalyzing glycerol gas-phase selective dehydration to produce acrylic aldehyde, glycerol conversion rate is 70-100%, acrylic aldehyde selectivity is 75-95%, and the catalyst is simple in preparation process, high in catalytic performance and long in service life.

The invention relates to a catalyst for preparing acrylic acid by oxidation of acrylic aldehyde, a preparation method of the catalyst, and a synthesis method of acrylic acid, and is used for mainly solving the problem of not high selectivity of an acrylic acid catalyst in the prior art. The technical problem is better solved through adopting the technical scheme that the acrylic acid catalyst contains an active component represented by the following general formula of Mo12VaCubXcYdZeKfOj, wherein X is at least one selected from W, Cr and Sn, Y is at least one selected from Fe, Bi, Co, Ni, Sb, Zr and Sr, and Z is at least one selected from lanthanide elements. The acrylic acid catalyst can be used in industrial production of acrylic aldehyde oxidation production of acrylic acid.

A method of purifying acrolein or propionaldehyde with a single column distillation system is provided, where the distillation system has a side-draw take-off outlet for recovering purified acrolein or propionaldehyde located between the crude product feed point and the light-boiling impurities distillation site.

The invention discloses a method for preparing acrylic acid by carrying out liquid phase catalytic oxidation on acrylic aldehyde. The method disclosed by the invention comprises the following steps: taking an organic solvent as a reaction solvent system, adding acrylic aldehyde and nitrogen-doped carbon nanotubes, introducing oxygen, stirring and reacting for 0.1-24 hours at the pressure of 0.1-2MPa and at the temperature of 80-100 DEG C, and oxidizing the acrylic aldehyde into acrylic acid. The method disclosed by the invention has the advantages of high acrylic acid selectivity, mild reaction conditions, simple operation, low cost, simple and easily available catalyst, easiness in recycling and good stability; and the conversion rate of the acrylic aldehyde reaches more than 20%, and the selectivity of the acrylic acid reaches more than 60%.

The invention discloses a treatment method of acrylic acid wastewater. A certain amount of alkali is added into the high-concentration aldehyde-containing acrylic acid wastewater, fractions are collected in a distillation mode and can enter a wastewater device for biochemical treatment, and distillation still liquid is incinerated. The method is simple and easy to implement, the COD removal rate is high, acrylic acid and aldehyde substances with biotoxicity can be removed, the treatment cost of the wastewater can be greatly reduced, and the method has important social benefits and economic benefits.

The invention relates to a polymer for treating coccidiosis of poultry, which is a terpolymer having a molecular weight greater than 1,000 and formed by copolymerizing acrylic aldehyde, crylic acid, low-alkyl alkenyl acid or polyprotic acid.