37results about How to "Efficient catalytic reaction" patented technology

The invention provides a new method for the synthesis of hindered phenols antioxidants. Under the action of a composite catalyst, a compound II and a compound III are subjected to transesterification and byproducts-methanol is obtained via heating and decompression; the rate of conversion of the product is more than 98%, and the compound I of hindered phenols antioxidants is directly obtained without crystallizing and purifying reaction liquid by solvent. The composite catalyst is composed of a primary catalyst of carboxylates of organotin and a secondary catalyst of thioester compounds of phosphite ester. The primary catalyst can be recycled.

The invention relates to a preparation method for a denitrified catalyst which has a nanometer multi-wall spherical structure and takes spinel double-metal oxide as an active component, and belongs to the fields of nanomaterial preparation technique and environment protection technology. The preparation method mainly comprises the steps: by taking carbon spheres, synthesized by various carbon precursors through hydrothermal reaction, as templates, firstly, evenly dispersing in an ethanol/water mixed solution in which various metal precursors are dissolved, then aging in a solution so as to realize the full adsorption of metal ions, finally drying, controlling temperature and calcining and the like, thus obtaining the spinel-state denitrified catalyst with high specific surface area and high activity. Proved by tests, the catalyst has wider catalytic temperature windows. Therefore, the catalyst can be used for selective catalytic reduction of nitrogen oxide in smoke emitted from a diesel engine tail gas, a coal-fired power plant, a steel mill and the like.

The invention provides a catalyst used for pentanoate bio-fuel production, and a method for inhibiting carbon deposit of the catalyst. The catalyst comprises an acidic carrier modified with alkali metal or alkali earth metal, and hydrogenated metal loaded on the carrier. The catalyst provided by the invention has the advantages of low cost, good stability, inhibition of carbon deposit in the pentanoate bio-fuel production process, guaranteeing of the continuous and highly-efficient proceeding of the catalysis reaction, and suitableness for industrial production of pentanoate.

A carried alkali-metal catalyst for synthesizing biologic diesel oil by exchange reaction of the fatty-acid ester is prepared from alkali-metal salt (LiNO3, NaNO3, or KNO3) or alkali-metal hydroxide (LiOH, NaOH, or KOH) and alkali-earth metal oxide (Cao, SrO, or BaO) through preparing the salt (or alkali)-soluble aqueous solution of alkali-metal salt (or hydroxide), immersing alkali-earth metal oxide in it, ageing, evaporating solvent, baking and grinding.

The invention discloses a preparation method for a graphene-based cobalt carbonate catalyst for oxidizing cyclohexene. The method comprises the following steps: preparing graphite oxide (GO) with functional groups, such as, carboxyl, hydroxy and carbonyl on single-layer or multilayer surfaces by taking graphite powder as a raw material and taking concentrated sulfuric acid (H2SO4), sodium nitrate (NaNO3) and potassium permanganate (KMnO4) as co-oxidants, and then adopting a hydrothermal method and high-temperature calcination for preparing the graphene-based cobalt carbonate (CoCO3@RGO) catalyst by taking cobalt acetate (Co(AC)2.4H2O) under an alkaline condition. According to the method, a simple solvent thermal process is adopted for preparing CoCO3@RGO catalyst, H2O2 is used as an oxidizing agent for catalytically oxidizing cyclohexene into cyclohexenone under a room temperature condition, the conversion rate reaches up to 89.96% and the selectivity reaches up to 90.66%. The CoCO3@RGO catalyst prepared according to the method is low in cost, green and environment-friendly, has excellent catalytic performances and has an important application prospect in organic synthesis and catalytic reaction.

The invention belongs to the field of synthesis of high polymer materials, particularly relates to a method for preparing poly (butylene succinate) by taking dimethyl succinate as a raw material, and provides the method for preparing poly (butylene succinate) by taking dimethyl succinate as the raw material. The method comprises the following steps: catalyzing dimethyl succinate and butanediol to perform transesterification reaction by using a transesterification catalyst to obtain a transesterification product; and mixing the ester exchange product with a polycondensation catalyst, and carrying out a polycondensation reaction to obtain the poly(butylene succinate). The preparation method provided by the invention can effectively reduce the generation of side reactions and the yield of a byproduct tetrahydrofuran, and the poly (butylene succinate) with higher molecular weight is obtained. Meanwhile, the raw materials are cheap and easy to obtain, so that the reaction cost is reduced.

The invention discloses a new method for preparing imipenem. The method comprises the following steps of: carrying out a Refortmasty reaction on an imipenem intermediate compound 4AA used as a starting material and an intermediate IX in the presence of a catalyst and obtaining an intermediate X through hydrolyzing; carrying out an N-H cabbeen insertion reaction on the intermediate X in the presence of a catalyst to obtain a double-ring parent nucleus III; in the presence of an organic base, phosphorylating to obtain an intermediate IV, directly reacting with cysteamine hydrochloride without separating, and then adding a proper solvent to obtain a solid solvent clathrate compound VI; directly carrying out condensation reaction on the solvent clathrate compound VI and imine benzyl oxide in the presence of base without removing the solvent to obtain an intermediate VII; and directly carrying out a catalytic hydrogenation reaction with the intermediate VII without separating to obtain a solution I containing the imipenem. The imipenem has a high content in the solution and can be crystallized by any known method in the field to obtain an imipenem-hydrate crystal.

The invention discloses a tertiary leucine derived chiral amine compound as well as a preparation method and application thereof. The chiral amine compound contains a tert-butyl group, a primary amine, a secondary amine or a tertiary amine functional group and has the structural formula as shown in the specification; and chiral amine and salts thereof are prepared through simple preparation steps by taking common tert-leucine as the raw material to form the chiral amine compound. The chiral amine and the salts thereof can be used for the asymmetrical Michael additive reaction between alpha, beta-unsaturated ketone and a nucleophilic reagent such as nitrocarbol, malonic ester, substituted oxazolone and the like and the asymmetrical cascade reaction between the alpha, beta-unsaturated ketone and fifth-position unsaturated rhodanine, between fifth-position unsaturated hydantoin and the alpha, beta-unsaturated ketone; and the tertiary leucine derived chiral amine compound has very high catalytic activity and stereoselectivity as well as the highest diastereoselectivity of 30/1 and the highest enantioselectivity of 99%, and is wide in oligomer range.

The invention discloses a preparation method of silk nano globules coating an enzyme. The preparation method comprises the following steps of: S1: preparing a silk solution; and S2: wrapping the enzyme into the silk to form the silk nano globules coating the enzyme. The prepared silk nano globules can be applied to the medical field, and in particular to an antialcoholic drug. The silk nano globules prepared by the method can effectively protect the activity of the wrapped enzyme to realize cascade reactions of various enzymes, and meanwhile have good biocompatibility.

The invention discloses a preparation method of a copper and ferrum composite catalyst loaded on an aluminum surface, and relates to the technical field of organic synthesis. According to the method, cheap, available and easy-to-recycle metal aluminum is taken as a carrier; metal copper and ferrum are loaded through redox reaction; and large specific surface area is formed by corrosion in a weak alkaline environment, and thus the activity of the catalyst can be improved, and the efficient catalytic reaction is achieved. The copper and ferrum composite catalyst loaded on the aluminum surface has the advantages of being cheap, easy to prepare, low in toxicity, easy to recycle and the like, and is suitable for application in pharmacy industry.

The invention discloses a method for rapidly preparing a metal organic layer material and application. The method comprises the following steps: dissolving a metal salt, a tricarboxylic acid ligand and an acidity regulator in a solvent, then carrying out microwave heating to raise the temperature for reaction, and carrying out centrifugal separation, washing and drying on the obtained precipitateproduct to obtain the metal organic layer material. The method is very rapid and efficient, the required product can be obtained by only heating to 120 DEG C at the soonest without a heat preservationreaction process, the obtained product can be applied to catalytic degradation of an organic phosphorus poisoning agent, the performance is very good, the degradation half-life period is less than 3minutes, an excellent recycling value is also achieved, and the degradation half-life period after reuse is still about 5 minutes.

The invention belongs to the technical field of gene engineering, and particularly relates to a chitin deacetylase gene, chitin deacetylase and a preparation method and application of the chitin deacetylase. A nucleotide sequence of the chitin deacetylase gene cdaba is as shown in SEQ ID NO:1, and is obtained by comprehensively optimizing a sequence of the chitin deacetylase derived from Bacillusatrophaeus. An amino acid sequence of the chitin deacetylase CdaBa is as shown in SEQ ID NO:2, the varieties and source ways of the chitin deacetylase are enriched, the enzyme specific activity can reach 352 U/mg, good stability is shown in a relatively wide temperature range and a relatively wide pH range, and the chitin deacetylase CdaBa has good application prospects and industrial value.

The invention provides a method for preparing a propylene glycol type antifreezing solution from natural lignocellulose raw materials. Straw, corn cobs, and other lignocellulose biomass are used as raw materials, an aqueous solution is added into a slurry bed reactor, and with the effects of a catalyst, an aqueous solution product whose main component is propylene glycol is obtained; distillation or membrane separation and other methods are used for changing the concentration of the aqueous solution of propylene glycol in order to blend the high-quality propylene glycol type antifreezing solution with green and environmental protection. The method has the advantages of cheap and easily available raw materials, high product value, mild reaction process, and high conversion efficiency; waste biomass is used for reaction, and application values of waste lignocellulose materials are substantially improved.

The invention belongs to the technical field of tail gas treatment and particularly relates to a treatment system and technology for nitrate production tail gas. The treatment system for the nitrate production tail gas comprises a first-level static demister, a second-level static demister, a first-level preheater and a reducer which are communicated in sequence. Separation is conducted through the multi-level static demisters of different running voltages, the content of impurities in the nitrate production tail gas is gradually lowered, the effect of separating substances such as sodium nitrate and sodium nitrite from moisture and gas is guaranteed, the effect of removing the impurities is stable and reliable, and it is guaranteed that the gas meets the requirements of following workingsegments.

The invention relates to a process for treating organic wastewater. The process is characterized in that the organic wastewater containing ammonia nitrogen adopts a material obtained by impregnating aPt or Ru metal salt on a cerium-zirconium oxide carrier as a catalyst, and oxidative degradation is performed in a pure oxygen or air atmosphere to remove COD, wherein a liquid-solid ratio of a volume of the wastewater to a mass of the catalyst is (10-50):1 ml/g, the reaction temperature is 180-220 DEG C, the pressure is 3-8 MPa, and the reaction time is 1-4 h. The process provided by the invention is a method used for reducing the COD in the organic wastewater, the treatment temperature and pressure are obviously reduced, after treatment is performed, the removing rate of the COD in the organic wastewater can reach 70%, and the biodegradability of the organic wastewater containing the ammonia nitrogen is greatly improved.

The invention is applicable to the technical field of rosin processing, and provides a preparation method and processing equipment of rosin resin, in the preparation method of the rosin resin, nano aluminum oxide is modified to serve as a carrier, so that the nano aluminum oxide has good carrying capacity and is beneficial to carrying silicon dioxide; silicon dioxide is used as a carrier, so that the reaction can be well catalyzed, impurities in the rosin resin can be adsorbed, and the color of the rosin resin can be lightened; an antioxidant is added in the preparation process of the rosin resin, so that the rosin resin can be effectively prevented from being oxidized, the color of the rosin resin is further lightened, and meanwhile, the thermal stability of the rosin resin can be effectively improved; and the rosin resin processing equipment disclosed by the invention has a good heat preservation and heat insulation effect, and is beneficial to the proceeding of a reaction.