63results about How to "Catalytic conditions are mild" patented technology

The invention relates to a method for extracting purple potato pigment by using ultrasonic wave and compound enzyme, which includes steps of (1) preprocessing raw material; (2) extracting the purple potato pigment by using ultrasonic wave and compound enzyme; and (3) refining extract by using macroporous resin. By using ultrasonic wave extraction technology, the present invention accelerates diffusion speed of educt from the raw material to solution, and has characteristics high extraction efficiency, no need of high temperature low energy consumption, and greatly shortened extraction time, the enzyme has characteristics of high catalytic efficiency, strong effect specificity and mild catalytic condition, and can increase productivity, lower energy consumption, reduce pollution, simplify process when being used in industry. By combining the ultrasonic wave extraction technology and the biological enzyme technology, the invention has advantages of short extraction time, high production yield, simple process, easy control of operation, convenience for large scale industrialization production and obvious economic benefit.

The invention discloses a copper-cobalt double-metal organic framework/nano-fiber composite material (CuCo-MOF@NF). A preparation method of the composite material includes the steps: firstly, preparing a copper-cobalt double-metal organic framework by a solvothermal method; secondly, mixing the copper-cobalt double-metal organic framework and a high-molecular polymer to prepare the copper-cobalt double-metal organic framework/nano-fiber composite material by an electrostatic spinning method. The composite material has excellent catalytic effects on azo-dyes such as rhodamine B (cationic dyes)and acid red 1 (anionic dyes) at normal pressure and temperature. The preparation method of the composite material is simple, a catalyst is convenient to operate and recycle, high in catalytic efficiency, good in stability and less in dosage, mass production of the composite material is easily achieved, and the composite material has an excellent application prospect in respects of catalytic degradation of azo-dyes in industrial wastewater and control of other pollutants.

The invention discloses a supported tungsten-gallium polyoxometallate catalyst and a preparation method and application thereof.Keggin type tungsten-gallium polyoxometallate is fixed to the surface of porous silicon dioxide successfully by grafting APTES on the surface of the porous silicon dioxide with the nanometer scale pore diameter, and the novel supported tungsten-gallium polyoxometallate catalyst is obtained.According to the catalyst, molecular oxygen can be used as an oxidizing agent, and the high conversion rate and good selectivity can be obtained when the catalyst is used for epoxidation reaction of cyclohexene on the solvent-free condition.

The invention discloses a method for improving selectivity of citronellol synthesized through citronellal hydrogenation. The method comprises the following steps: taking metal nano-particle @MOFs as acatalyst, performing activating treatment, and catalyzing selective hydrogenation of citronellal to produce citronellol accompanying with stirring and heating under the conditions of a hydrogen atmosphere and a pressure of 0.1-1MPa. Compared with the traditional catalytic reaction process, the method disclosed by the invention is mild in catalytic conditions and high in efficiency and yield, andhas high selectivity of the principal product citronellol. Moreover, according to the method, the nanoscale metal nano-particles are coated in the MOFs, and due to a protective effect of the MOFs structure, the metal nano-particles do not agglomerate and re-grow in the reaction process, so that the continuous high efficiency and stability of the catalyst are ensured.

The invention discloses an NADH analog dependent cytochrome P450 reductase and an application thereof. An NADH analogue is used as a cofactor and reducing power to catalyze electron transfer and reduce cytochrome P450 to complete catalytic circulation. The enzyme is subjected to fusion expression with different types of cytochrome P450 enzymes to construct the NADH analog-dependent, heterozygous and self-sufficient cytochrome P450 enzyme, the obtained NADH analog-dependent cytochrome P450 enzyme can be coupled with oxidoreductases of a regenerated NADH analogue, and the NADH analog is used tocatalyze corresponding substrates of different families of cytochrome P450 to be converted into products. The NADH analog-dependent cytochrome P450 reductase can be used for constructing a biologicalorthogonal metabolic pathway independent of natural cofactor NAD(P)H to realize uncoupling of P450 enzyme-catalyzed energy consumption and endogenous energy metabolism.

The invention relates to the field of daily chemical, in particular to a preparation method of a rosa canina fruit extract and application thereof in a skin care cream. The preparation method mainly comprises the steps that 1, dried rosa canina fruits are subjected to superfine grinding so as to pass through a 100-mesh sieve; 2, a composite biological enzyme is prepared; 3, the ground rosa canina fruits are added into a solvent, then the temperature is increased to 50-55 DEG C, then the composite biological enzyme is added, the pH is adjusted by acid to be 4.5-5.0, after the mixture is stirred to be uniform, enzymolysis is kept for 2 H at the temperature of 50-55 DEG C, then the temperature is rapidly increased to 100 DEG C for rapid inactivation, the temperature is decreased to 80 DEG C 1 MIN after inactivation, and reflux extraction is carried out for 1H; 4, the extract is filtered, deslagged, concentrated and dried to obtain an educt. The method has the advantages of being high in catalysis efficiency, mild in catalysis condition, and capable of lowering energy consumption, reducing pollution and simplifying technological procedures. When the rosa canina fruit extract prepared through the preparation method is applied to the skin care cream, the effects of well moistening, moisturizing and repairing skin can be achieved.

The invention belongs to the field of chemistry, and relates to a synthetic method of asymmetrical thioether. The synthetic method comprises the following steps of (a) under the condition of catalysis of tetrabutyl ammonium halide, enabling a structural compound as shown in a formula (I), a structural compound as shown in a formula (II) and sulfur oxonium salt to react in a solvent so as to obtain the asymmetrical thioether with a structure as shown in formula (III), wherein R1 is selected from phenyl, substituted phenyl, naphtyl, substituted naphtyl, thienyl, or substituted thienyl; R2 is selected from hydrogen, phenyl, substituted phenyl, naphtyl, substituted naphtyl, thienyl or substituted thienyl; or R1, R2 and C connected with R1 and R2 form fluorene or thioxanthene; R3 is selected from hydrogen or an alkyl group; R4 is selected from hydrogen, phenyl, substituted phenyl, naphtyl, substituted naphtyl, thienyl or substituted thienyl; R5 is selected from hydrogen; or R4, R5 and C connected with R4 and R5 form the fluorene or the thioxanthene; R6 is selected form the alkyl group or the substituted alkyl group; and X is selected from C1, Br or I.

The invention provides a hydrophobic organic solid acid catalyst and a preparation method thereof, belonging to the field of solid catalysts. The hydrophobic organic solid acid catalyst solves the technical problems that many catalysts are used in the reaction of preparing 5-hydroxymethylfurfural (HMF) by cellulose, the yield of the HMF is not improved and the HMF can be further transformed into a by-product in the reaction. A high-internal-phase emulsion method is adopted for preparing macro-porous organic solid catalyst, and the macro-porous organic solid catalyst is subjected to acid and hydrophobic modification, and then is used as the catalyst for transforming the cellulose into HMF.

The invention discloses a cerium oxide/HZSM-5 molecular sieve composite catalytic material, a preparation method, and application thereof in catalytic decomposition of carbon tetrafluoride. The composite catalytic material is formed by loading cerium oxide on HZSM-5 molecular sieve, the catalyst can achieve efficient catalytic conversion of carbon tetrafluoride into carbon dioxide under mild conditions, and the defects that a traditional carbon tetrafluoride decomposition catalyst is prone to inactivation at a relatively high temperature and low in low-temperature activity are avoided.

The invention discloses a covalent organic framework material BM-SO3H with acid-base dual functions as well as a preparation method and application thereof, the material has a structure as shown in a formula (I), and the preparation method comprises the following steps: firstly, synthesizing a benzimidazolyl covalent organic framework material BM under the catalysis condition of a photocatalyst; then, the BM and 1, 3-propane sultone are subjected to a ring-opening N atom alkylation reaction, and the covalent organic framework material BM-SO3H is obtained. The material has benzimidazole and propane sulfonic acid structures, so that the material has acid-base dual functions. BM-SO3H is used as a heterogeneous catalyst to catalyze a tandem decarboxylaldehyde Knoevenagel condensation reaction, and the yield can reach 95%-99%. The heterogeneous catalyst BM-SO3H shows excellent catalytic performance, thermal stability and recycling performance, and has a good application prospect.

The invention discloses a catalyst for isobutylene polymerization and a preparation method thereof. The catalyst is composed of, by weight, 10 parts of amorphous silicon aluminum, 20 parts of molecular sieve, 13 parts of magnesium oxide, 9 parts of sodium carbonate, 13 parts of activated carbon, 8 parts of alkaline aluminum sulfate, 8 parts of kaolin, 17 parts of diboron trioxide, 15 parts of iron trioxide, 25 parts of nano zinc oxide particles and 8 parts of calcium oxide. The catalyst has the advantages that the catalyst prepared by the method has high control ability on polymerization degree of isobutylene and can only directionally catalyze isobutylene to be diisobutylene, triisobutylene and tetraisobutylene, and the catalyst has low requirements on raw materials and high adaptability.

The invention discloses a polyionic liquid catalyst, an amino ionic liquid 1-vinyl-3-ethylamino imidazole bromate and a quaternary ammonium ionic liquid vinyl benzyl triethyl ammonium chloride are taken as the active components, divinyl benzene is taken as a skeleton, free radical polymerization is used to prepare and obtain a polyionic liquid material, the excellent synergistic effect between theamino ionic liquid and the quaternary ammonium ionic liquid is used, the catalytic conversion of CO2 is efficiently conducted without solvents or additional cocatalysts at the normal pressure to prepare cyclic carbonate, the stability of the catalyst is good, and the catalyst can be recycled.

The invention relates to a catalyst for splitting racemic epoxyalkane. The catalyst is composed of nitrogen-containing organic alkali or quaternary ammonium salt, and Cr (Salen) [(R,R)/(S,S)-N,N'-Bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediamino chromium (III) chloride], the mole ratio of the organic alkali or quaternary ammonium salt to the Cr (Salen) is 0.1-10; in the process of carrying out asymmetric ring-opening splitting of the racemic epoxyalkane, the splitting conversion rate of the catalyst to epoxyalkane can be greater than 49%, and the ee value of a split product 1-azido-2-trialkyl siloxane can be over 90%. The catalyst mainly solves the problem that previous catalytic racemic epoxyalkane is low in asymmetric ring-opening reaction activity, large in application amount of the catalyst and low in enantioselectivity, realizes the efficient splitting of racemic epoxyalkane, and can obtain high-purity chiral epoxyalkane and trialkyl siloxane.

The present invention discloses a copper-based catalyst, which is prepared by reaction of sodium metasilicate and a copper source in an organic phase environment. Compared with the prior art, the copper-based catalyst of the present invention has the catalytic copper dispersedly immobilized on a silica gel carrier to expand the area of contact with the reaction substrate materials. Compared with the prior art, the copper-based catalyst has higher catalytic efficiency, requires more moderate catalytic conditions, and is in favor of industrial production. At the same time, the method of the present invention is completed under the condition of pure organic phase; by contrast, the obtained copper catalyst has higher catalytic efficiency than the one obtained in general water content conditions.

The invention discloses a preparation method of a dechlorination catalyst. The dechlorination catalyst is obtained in the mode that sodium metasilicate and a metal source react under the environment of an organic phase. Compared with the prior art, the dechlorination catalyst is used for dispersing and fixing palladium and aluminum which have a catalytic effect to a silica gel carrier, and the contact area between the dechlorination catalyst and reaction bed charge is increased. Compared with the prior art, the catalytic efficiency of the dechlorination catalyst is higher, the needed catalytic condition is more moderate, and industrial production is facilitated. Meanwhile, the method is completed under the condition of a pure organic phase, and according to comparison with the common water containing condition, and the catalytic efficiency of the obtained dechlorination catalyst is higher.

The invention relates to the field of catalysts, and provides a FeCo/N-C nano composite material which is in a rod shape, has a porous structure and is high in catalytic efficiency aiming at the problem that the reaction condition of the existing synthetic ammonia catalyst is harsh. The invention also provides a preparation method of the catalyst, which comprises the following steps: a, dissolving Fe salt, Co salt and ligand in a solvent, heating for reaction, and separating out precipitate after the reaction is finished to obtain a precursor; and b, calcining the precursor to obtain the FeCo/N-C nano composite material. The preparation method is simple, and the prepared catalyst is high in purity. The invention also provides application of the catalyst in electrocatalytic nitrogen fixation ammonia synthesis.

The invention relates to an efficient purple potato pigment extraction method. Specifically, the purple sweet potato pigment extraction method comprises the steps of performing enzymolysis treatment on purple sweet potato pulp by using pectinase and cellulase, extracting the purple sweet potato pigment in the enzymolysis solution by using ultrasonic technology, purifying the obtained purple sweetpotato pigment, and the like. The invention combines biological enzyme technology and ultrasonic extraction technology, and has the advantages of simple extraction process, high efficiency, short extraction time, high product recovery rate, no toxicity, convenience for large-scale industrial production and obvious economic benefits.

The invention discloses a preparation method of beta, gamma-unsaturated ester. A structural formula of the beta, gamma-unsaturated ester is shown in the description. The preparation method of the beta, gamma-unsaturated ester comprises the following steps: adding 1,1-diphenylethlene and 2-bromopropionate into a reaction system containing a silver catalyst, an oxidant, alkali and a solvent for reacting.