37results about How to "Resolve inactivation" patented technology

The invention provides a catalyst used in deep desulfurization of gasoline and diesel; the catalyst can reduce the thiophene content in oil products from 40000ppm to less than 0.5ppm and has certain anti-adhesion ability to alkene thus solving perfectly the deactivation problem of the catalyst caused by carbon deposition. Metal or nonmetal elements utilized by a carrier during the preparation process of the catalyst are modified, and activated components are immersed to the carrier separately, and calcined step by step. The catalyst is pre-vulcanized by hydrogenation-pre-vulcanization during the reaction process, and the space velocity of pre-vulcanized liquid is different from the liquid space velocity of the reaction material.

The invention provides a 2-deoxy-D-ribose-5-phosphate aldolase (DERA enzyme) which is capable of catalyzing an aldol condensation reaction at high performance. Compared with a wild type escherichia coli DERA enzyme, the 2-deoxy-D-ribose-5-phosphate aldolase has improved substrate resistant ability and more efficient catalytic ability. If the DERA enzyme provided by the invention is used as a catalyst, the problem of the inactivation of the DERA enzyme caused by a high-concentration chloroacetaldehyde substrate can be solved, and simultaneously, the volume of addition of the enzyme in the production process is reduced. The invention also provides a nucleic acid for coding the DERA enzyme, a recombinant expression vector containing the nucleic acid, a recombinant expression transformant containing the recombinant expression vector, a method for preparing a recombinant DERA enzyme and a catalyst for forming an optically active statin intermediate through catalysis.

The invention relates to a method for preparing 3-phenyl-L-serine or a derivative thereof. The preparation method comprises the following steps of: a, obtaining 3-phenyl-L-serine or a derivative thereof according to a reaction general formula as shown in a formula I, in which R is selected from a hydrogen group, an alkyl group, an alkoxy group, an alkyl sulfonyl group, an alkyl sulfinyl group, analkyl sulfenyl group, a sulfonic group, a sulfinyl group, a sulfydryl group, a nitro group and halogen; n is 0, 1, 2 or 3; wherein the transaldolase is L-threonine transaldolase,; and acetaldehyde reductase is added in the step a.

The invention relates to an SCR flue gas denitrification catalyst and belongs to the technical field of flue gas denitrification. The flue gas denitrification catalyst comprises the following components in parts by weight: 65-95 parts of a carrier, 5.5-15.5 parts of active ingredients and 4-16 parts of auxiliary materials, wherein the carrier comprises 65-85 parts of silicon carbide. According to the technical scheme, the invention provides the denitrification catalyst with the main component of the carrier being silicon carbide, and the catalyst can maintain a relatively high catalytic efficiency at 600 DEG C, so that the problem that a conventional titanium catalyst is inactivated at the temperature is solved, and the benefit is remarkable. The invention further relates to a preparation method for the SCR flue gas denitrification catalyst. The preparation method comprises two steps: carrier preparation; and catalyst preparation. According to the scheme provided by the invention, silicon carbide is surface oxidized by adopting an acidic hydrothermal method, metal salt is reduced to metal single element by virtue of strong reducing property of sodium borohydride, the metal single element is deposited on the surface of the carrier, and a final catalyst product is obtained through a series of processes, so that the catalyst has an industrial production prospect.

The invention relates to the technical field of waste catalyst recycling, in particular to an ultrasonic pickling regeneration method for a waste flue gas denitration catalyst. The ultrasonic pickling regeneration method comprises the following steps: (1) dust collection: blowing and cleaning dust on the surface of an inactivated catalyst sample; (2) washing: after the sample is subjected to the dust collection, soaking the sample into ionized water for ultrasonic washing through an ultrasonic generator; (3) acid pickling: after the sample is washed, putting the sample into a mixed acid solution consisting of fatty alcohol-polyoxyethylene ether, polyethylene glycol fatty acid ester and sulfuric acid, and performing ultrasonic acid pickling through the ultrasonic generator; (4) drying: putting the sample subjected to the acid pickling into a vacuum drying box for drying to obtain a regenerated catalyst. Compared with the conventional waste flue gas denitration catalyst regeneration technology, the ultrasonic pickling regeneration method disclosed by the invention has the advantages that the problem of inactivation of the catalyst due to blockage and poisoning can be solved at one time; furthermore, the cleaning step is eliminated, the loss of the activity of the catalyst is reduced, and the water pollution is alleviated.

The invention disclose a gonadotropin releasing hormone compound carrying sustained-release microsphere and a preparation method thereof. The preparation method comprises: step 1, adding an inner water phase into an oil phase and performing homogenization to obtain a primary emulsion, wherein the inner water phase is a water solution containing a first stabilizer and a gonadotropin releasing hormone compound, the first stabilizer comprises a polysaccharose substance and/or a weakly alkaline inorganic salt, and the oil phase is an organic solvent containing a high-molecular polymer material; step 2, mixing the primary emulsion obtained in step 1 with an outer water phase to obtain a compound emulsion, wherein the outer water phase is a water solution containing a second stabilizer; and step 3, curing, washing and freeze-drying the compound emulsion obtained in step 2 to obtain sustained-release microspheres. The preparation method is simple, and facilitates industrialized production. The sustained-release microsphere prepared by the preparation method can maintain high activity of gonadotropin releasing hormone on the premise of high carrying rate, and has the impurity content less than 2%.

The invention discloses a virus with the surface modified with calcium phosphate and a preparing method of the virus. The virus with the surface modified with the calcium phosphate is obtained by the fact that the virus is subjected to biomineralization with CaCl2 and Na2HPO4. The virus with the surface modified with the calcium phosphate has the advantages that quick and efficient enrichment can be achieved; transfection efficiency in a cell and an organism is greatly improved; the virus can be adaptive to dosing in an intravenous injection way, a calcium phosphate outer shell on the surface of the virus can protect adenovirus vector particles which then cannot be restrained by existing immunity or antibodies, and accordingly the function of the adenovirus vector particles as drug carriers can be well achieved. The Virus with the surface modified with the calcium phosphate and the preparing method of the virus are widely used in fields such as new generation vaccines and gene therapy.

The invention belongs to the technical field of polyurethane materials, and provides an environment-friendly harmless high-flame-retardant polymer material for plugging water and reinforcing coal androck masses in coal mines and a preparation method thereof in order to solve the problems of reduced flame retardancy and environmental pollution caused by migration of flame retardant elements of thepolymer material for coal mine reinforcement. The environment-friendly harmless high-flame-retardant polymer material is prepared by mixing two components of a main agent and a curing agent, whereinthe main agent is prepared by mixing phenolic phosphate polyol, polyether polyol, polyester polyol, a surfactant and a catalyst according to a certain weight ratio; and the curing agent is any one ora mixture of two of polymethylene polyphenyl isocyanate, diphenylmethane diisocyanate and toluene diisocyanate. The environment-friendly harmless high-flame-retardant polymer material does not containany plasticizer; due to the existence of phenolic phosphonate polyol, not only the phosphorus content is high, but also a phosphorus-rich coke layer with better thermal stability can be generated when the material is burnt and decomposed; the phosphorus-rich coke layer can inhibit the continuous combustion of matrix resin, effectively inhibits the generation of combustible gas, and improves the storage stability of the polyol, the bonding strength of the material and the hydrolysis resistance.

The invention discloses efficient purification activated carbon environment-friendly waste gas treatment equipment, and relates to the technical field of waste gas treatment.The efficient purification activated carbon environment-friendly waste gas treatment equipment comprises a base, a tank body is fixedly connected to the top of the base, a charging door is fixedly connected to the surface of the tank body, and a protection mechanism is fixedly connected to the left side of the inner side face of the tank body; an activated carbon interlayer is fixedly connected to the side, away from the protection mechanism, of the inner side face of the tank body, a temperature control mechanism is fixedly connected to the right side of the surface of the tank body, and the protection mechanism comprises a connecting wall. According to the efficient-purification environment-friendly activated carbon waste gas treatment equipment, through cooperative use of a protection mechanism, a stirring mechanism, a temperature control mechanism, a heat transfer mechanism and other mechanisms, the problems that activated carbon is inactivated due to the fact that lampblack in waste gas blocks activated carbon adsorption holes, and the adsorption capacity of the activated carbon is greatly reduced due to high-temperature waste gas are solved.

The invention discloses a pulmonary nodule auxiliary diagnosis method based on a three-dimensional multi-resolution attention capsule network, and belongs to the technical field of medical image processing. The method comprises the following steps: obtaining a pulmonary nodule CT image data set containing a pathological type label; preprocessing samples in the data set; constructing a three-dimensional multi-resolution attention capsule network; and inputting the preprocessed data sample into the three-dimensional multi-resolution attention capsule network for training, and improving the prediction capability of the three-dimensional multi-resolution attention capsule network on multiple pathological types of pulmonary nodules by learning sample distribution. According to the method of the invention, manual features do not need to be designed or auxiliary information such as serum biomarkers does not need to be utilized, and high prediction precision and high robustness can still be kept for small samples difficult to classify and unbalanced and multi-label clinical data sets.

The invention provides a lignite coke loaded nano-cobalt composite catalyst and a preparation method thereof. According to the preparation method, lignite is used as a carrier raw material, cobalt salt is used as an active metal precursor, the feeding ratio of cobalt to lignite in the cobalt salt is 5wt%-15wt%, and the lignite coke loaded high-dispersion nano-cobalt composite catalyst is synthesized through a modified impregnation method and high-temperature pyrolysis. The composite catalyst prepared by the invention has a hierarchical pore structure and a high specific surface area, nano cobalt is uniformly dispersed on the lignite coke, and the particle size is controllable, so that the obtained catalyst has excellent low-temperature CO2 methanation catalytic activity, and the preparation process is simple, the raw materials are cheap and easily available, and the composite catalyst is very suitable for industrial production and application.

The invention provides a method for hydrogen production through methanol steam reforming, a high-temperature self-activated nano cuprous oxide-zinc oxide composite catalyst and a preparation method and a cyclic regeneration method thereof, and relates to the technical field of hydrogen production. The high-temperature self-activated nano cuprous oxide-zinc oxide composite catalyst is adopted for hydrogen production through methanol steam reforming, the preparation cost is low, methanol serves as a hydrogen carrier, hydrogen pre-reduction is not needed, safety is higher, the hydrogen production efficiency is high, and high thermal stability is kept at the high temperature of 500 DEG C or above.

The invention relates to a method for improving the cellulase use efficiency, and an apparatus thereof. The method comprises the following steps: 1, extracting hemicellulose by using diluted sulfuric acid, immersing in an alkali to remove lignin, and processing a cellulose raw material; and 2, hydrolyzing the processed cellulose raw material by cellulase in an enzymatic hydrolysis reactor. The method and the apparatus avoid adsorption of lignin to cellulase and increase the hemicellulose utilization rate, and the enzymatic hydrolysis reactor is not provided with a stirring device to solve a problem of enzyme inactivation caused by excessive stirring of traditional enzymatic hydrolysis reactors; a traditional intermittence technology is changed to a continuous technology, so the product inhibition problem in the process is solved; and the cellulase use amount in the method and the apparatus in the invention is obviously lower than that of traditional technologies.

The invention belongs to the technical field of polymer materials, and provides a halogen-free high flame retardant polymer material for reinforcing coal and rock masses in coal mines and a preparation method thereof in order to solve the problems of lowered flame retardant performance, environmental pollution and the like caused by migration of flame retardant elements of the polymer material forreinforcing the coal mines. The halogen-free high flame retardant polymer material is prepared from two components of a main agent and a curing agent, wherein the main agent is epoxy phosphate polyol, polyether polyol, polyester polyol, a surfactant and a catalyst which are mixed according to the weight ratio of 15-45: 10-35: 7-25: 0.5-1: 0.5-2; and the curing agent is isocyanate. Due to the presence of epoxy phosphate polyol, not only the phosphorus content is high, but also a phosphorus-rich coke layer with good thermal stability can be generated during the combustion and decomposition of the material. The layer can inhibit the continuous combustion of the matrix resin, effectively inhibits the generation of combustible gas, and improves the storage stability of the polyol, the bondingstrength of the material and the hydrolysis resistance.

The invention provides a method for preparing N1-(2-aminoethyl)-1,2-ethidene diamine. The method comprises the following steps: preparing a solution from iminodiacetonitrile and a solvent; adding the solution into a hydrogenation reactor filled with a catalyst 1 and a catalyst 2, and reacting to produce N1-(2-aminoethyl)-1,2-ethidene diamine and a byproduct piperazine under a certain temperature and pressure, wherein the catalyst 1 has the effect of hydrogenating iminodiacetonitrile into N1-(2-aminoethyl)-1,2-ethidene diamine, and the catalyst 2 has the effect of hydrogenating iminodiacetonitrile hydrolysate into diethanolimine. According to the method disclosed by the invention, the stability of the catalyst 1 is greatly improved.

The invention discloses a high-sulfur light distillate and organic heat-carrier raw oil mixing process and belongs to the technical field of oil hydrogenation. The process is characterized by proportionally mixing high-sulfur light distillate and organic heat-carrier raw oil to produce lubricant base oil and light white oil; hydrogenation conditions for a first reactor and a second reactor: hydrogen partial pressure ranges from 15 MPa to 17.2 MPa, content of H2S of recycle gas ranges from 100 ppm to 500 ppm, airspeed ranges from 0.78 h<-1> to 0.83h<-1>, volume ratio of hydrogen to oil ranges from 500 to 600, and reaction temperature ranges from 300/280 DEG C to 306/285 DEG C; products of hydrogenation reaction are separated to obtain the lubricant base oil and the light white oil. According to the technology, different raw oil such as the high-sulfur light distillate and the organic heat-carrier are mixed proportionally, and then are used for producing two different products, namely the lubricant base oil and the light white oil, through the same device and the same catalyst.

The invention discloses a biomass boiler selective catalytic reduction (SCR) denitration technology. A composite active substance is introduced into the SCR denitration technology to serve as a catalyst, the reaction temperature is decreased to 260-290 DEG C, and the catalyst is prepared from the following components in percentage by mass of biomass: 0.25-1% of vanadium pentoxide, 0.25-1% of molybdenum trioxide, and 0.25-1% of manganese dioxide. According to the composite active substance, the problem of catalyst inactivation can be completely solved, the operation cost is low, operation is stable, up to now, the maximum operation time has reached two years, and the life of the catalyst is fully tested. According to the catalyst, the reaction temperature can be decreased to 260-290 DEG C,the reaction temperature is significantly decreased, and meanwhile, the reaction efficiency is improved to 80% or above.