Patents
Literature

779results about How to "Improve conversion rate" patented technology

Breeding for efficiently converting L-glutamate into gamma-amino butyric acid lactobacillus

The invention discloses breeding for efficiently converting L-glutamate into gamma-amino butyric acid lactobacillus strains, and belongs to the technical field of fermentation in bioengineering. The strains screened by the invention are classified and named as Lactobacillus plantarum GB 01-21 and collected in CCTCC with a collection number of CCTCCM 209102. A lactobacillus strain capable of producing gamma-amino butyric acid by using the L-glutamate is screened from homemade pickle, named as LP-GB 01 and taken as an original strain; and a positive mutant is obtained by screening after ultraviolet mutation and named as LP-GB 01-21. A preliminary conversion experiment is performed in a 100mL triangular flask; and after the conversion is stopped, the gamma-amino butyric acid in the conversion solution is measured by using an amino acid measurement instrument, wherein the concentration of the gamma-amino butyric acid is 51.9g/L and the molar conversion rate reaches 92.7 percent. When an amplified conversion experiment is performed in a 5L fermentation tank, the concentration of the finally obtained gamma-amino butyric acid is 132g/L, and the molar conversion rate is 94.3 percent. The microbial method provides basis for producing industrialized production of the gamma-amino butyric acid.
Owner:JIANGNAN UNIV

Method for synthesizing ultrafine calcium carbonate by utilizing carbide slag

The invention relates to a method for synthesizing ultrafine calcium carbonate by utilizing carbide slag. The method comprises the following steps of: (1) dissolving carbide slag: uniformly mixing carbide slag with water in a ratio of (1:6)-(1:20) to ensure that the carbide slag is fully dissolved into a turbid liquid, wherein the water content of the carbide slag is 20-45%; (2) carrying out impregnation reaction: adding ammonium chloride into the turbid liquid of the carbide slag for uniformly mixing, wherein the mass ratio of carbide slag to ammonium chloride is (1:0.7)-(1:2.5), after the impregnation reaction is finished, filtering and removing the slag to obtain a clear calcium chloride solution; and (3) carrying out carbonization reaction: adding a crystal form control agent into a calcium chloride solution for fully dissolving, introducing CO2 into the solution to carry out carbonization reaction till the pH (potential of Hydrogen) value of the reaction solution is less than or equal to 7 to obtain ultrafine calcium carbonate slurry, wherein the crystal form control agent is one or more than two mixtures of sulfate, chloride, citrate, sodium dodecyl benzene sulfonate, pyrophosphate, oleic acid, ammonium citrate, N-methyl pyrrolidone and maleic acid.
Owner:SINOMA INT ENG +1

Preparation method of double-network hydrogel

The invention relates to a preparation method of hydrogel and aims at providing a preparation method of novel double-network hydrogel with high water absorption and high strength. The preparation method comprises the following steps: firstly, a first network monomer, a cross-linking agent, a dispersion medium and an initiator are dissolved in water, and a solution is poured into a silica gel sheet mould, irradiated under strong ultraviolet radiation, stood and cooled; gel is taken out of the mould, put into a water solution containing a second network monomer, a cross-linking agent and an initiator, swollen until balancing, and then taken out to carry out weak ultraviolet radiation so as to obtain the double-network hydrogel with high water absorption and high strength. The invention has simple preparation process and can quickly obtain the double-network hydrogel with superior performance and high water absorptivity. The hydrogel has very good water absorbing capacity and superior mechanical property and can bear external force well. The hydrogel can be widely applied to the field of biomedicine comprising medicine wrapping, medicine slow-controlled release, artificial eye cornea, burn protective films and articular cartilage restoration and replacement and also has potential application value in the field of the light industry.
Owner:ZHEJIANG UNIV

Ruthenium catalyst, preparation method and application in synthesizing tetrahydrofurfuryl alcohol

The invention provides a ruthenium catalyst for synthesizing tetrahydrofurfuryl alcohol in one-step hydrogenation of furfural. The expression of the ruthenium catalyst is Ru-M/TiO2, wherein Ru accounts for 0.5-15 wt% of the catalyst; and M is a metal auxiliary and accounts for 0-20 wt% of the catalyst. A preparation method of the ruthenium catalyst comprises the following steps of: adding a carrier TiO2 into a water solution containing ruthenium salt or a water solution containing ruthenium salt and metal auxiliary salt such that the weight ratio of ruthenium to carrier is 0.005-0.15:1; and then, adding 2-10 wt% of potassium borohydride or hydrazine hydrate solution to precipitate the solution. A nonionic surfactant is optimally added in the preparation method to improve the catalytic activity and selectivity. If the catalyst is subject to hydro-thermal treatment in a water solution of sodium sulfate, then the adsorption property of the catalyst can be changed, and the selectivity of catalyzing furfural to synthesize tetrahydrofurfuryl alcohol through one-step hydrogenation can be greatly improved. The catalyst has simple preparation method, good catalytic activity and high selectivity and is especially applicable to catalyzing the reaction of furfural to synthesize tetrahydrofurfuryl alcohol through one-step hydrogenation under the conditions of low temperature, low pressure and no solvent. Under certain reaction conditions, the yield of tetrahydrofurfuryl alcohol can reach more than 99%.
Owner:JIANGSU QINGQUAN CHEM CO LTD

Synthesis method for producing ethylene with high-efficiency dehydration of biological ethyl alcohol

The invention provides a synthesis method for dehydrating biological ethanol to prepare ethylene, belongs to the technical field of the synthesis chemical project and relates to a preparation of the ethylene. The invention provides a method for dehydrating the biological ethanol to prepare the ethylene under the function of a nanometer molecular sieve catalyst. Under the normal pressure and in a certain temperature range, a fixed bed reactor which uses the nanometer molecular sieve as the catalyst and uses the liquid biological ethanol as a raw material, and while the inertia gas is used for adjusting the partial pressure of the gas ethanol in the preheating section of the reactor, the desorption of the generated ethylene from the catalyst is strengthened so as to achieve the aim of efficiently dehydrating and synthesizing the ethylene by the ethanol. The synthesis method of dehydrating the biological ethanol to prepare the ethylene of the invention is outstandingly characterized in that: (1) the nanometer molecular sieve is applied in dehydrating the biological ethanol to prepare the ethylene; (2) while the inertia gas is used for adjusting the partial pressure of the gas ethanol, the desorption of the generated ethylene from the catalyst is strengthened; (3) the catalyst is good in stability, reaction is low in temperature, ethanol is high in conversion, ethylene is high in selectivity, environment is not polluted and the process is simple. A nanometer HZSM-5 molecular sieve is used as the catalyst, and 95(v/v) percent of liquid ethanol is used as the raw material (the ethanol weight space velocity is 1.2 hours<-1>), the nitrogen is used for adjusting the partial pressure of the gas ethanol in the preheating section of the reactor, the ethanol conversion is more than 99 percent and the ethylene selectivity is more than 98 percent in the reaction time of 600 hours under the reaction temperature of 240 DEG C.
Owner:DALIAN UNIV OF TECH

Catalytic conversion method for processing high-nitrogen raw material

ActiveCN103031147AReduce olefin contentImprove conversion rateTreatment with plural serial stages onlyChemistryHigh nitrogen
A catalytic conversion method for processing a high-nitrogen raw material is characterized in that a regenerated catalyst having a lower temperature enters the pre-lift section of a reactor, upward flows under the action of a pre-lift medium, enters a first reaction zone, contacts with the high-nitrogen raw material, adsorbs and reacts at the lower portion of the first reaction zone, and upward flows; the formed oil agent mixture enters a second reaction zone, contacts with a regenerated catalyst having a higher temperature in the second reaction zone, and continuously and fully reacts; and the oil agent mixture from the second reaction zone goes through the outlet of the reactor and undergoes gas-liquid separation, the carbon-containing catalyst obtained after the separation is stripped, scorched and regenerated for cycle use, and the separated reaction oil gas is sent to a subsequent product separating system. The method can be used to directly process the high-nitrogen raw material, and improves the conversion rate of the high-nitrogen raw material. The method is simple to operate, and a routine catalytic cracking device can be simply reconstructed to carry out the operation of the method. Gasoline produced through the method has a low olefin content.
Owner:CHINA PETROLEUM & CHEM CORP +1

Solid flaky polycarboxylate water-reducer and polymerization preparation method thereof

ActiveCN106543382AImprove conversion rateHigh branch densityWater solubleDicarboxylic acid
The invention discloses a solid flaky polycarboxylate water-reducer and a polymerization preparation method thereof. The polymerization preparation method comprises the following specific steps: placing 850 to 890 parts of polyether macro-monomer in a reaction kettle without adding water or any organic solvent, and heating to 65 to 75 DEG C; stirring until the polyether macro-monomer is dissolved completely, keeping the temperature at 65 to 75 DEG C, putting 5 to 10 parts of weak chain transferring agent, 2.5 to 5.0 parts of organic peroxide initiator, 7.5 to 12.5 parts of unsaturated dicarboxylic acid and 25 to 40 parts of acrylic acid at a time; after the materials are added at a time, starting to dropwise add a mixed solution of 50 to 80 parts of acrylic acid and 1.2 to 3.5 parts of strong chain transferring agent, and adding an azoic initiator at two times in the dropwise adding process; after finishing the dropwise adding, curing for 1 to 2 hours, adding 7.5 to 16.0 parts of neutralizing agent, stirring uniformly, and slicing after cooling to obtain a finished product. The solid flaky polycarboxylate water-reducer is convenient to store, is low in long-distance transportation cost, is completely water-soluble, and is suitable for cement-based binding materials in civil engineering.
Owner:HUBEI UNIV OF TECH

Excitation video advertisement intelligent delivery method

The invention relates to an incentive video advertisement intelligent delivery method, which comprises the following steps: establishing a user database, and obtaining user data; performing standardization processing on the user data; portraying user crowd portraits, and matching a plurality of crowd attribute tags for each user; dividing the target crowd into a core crowd, a strongly related crowd and a radiation crowd; establishing a CTR prediction model, and carrying out click rate estimation; performing basic evaluation on the core crowd, the strongly related crowd and the radiation crowdaccording to the predicted click rate, and performing real-time adjustment according to the transaction condition; carrying out advertisement putting processing through basic evaluation, and completing advertisement putting display and reproduction processing by locking accurate putting of the target crowd. According to the method, personalized advertisement putting strategies are customized for different users, personalized accurate putting and maximum traffic variation of the internet advertisements are achieved, resource and cost waste brought to enterprises and advertisers due to non-objective putting is avoided, and the optimal marketing effect is achieved through a small number of resources.
Owner:上海旺翔数字科技股份有限公司

Catalyst applicable to synthesis of methanol by multi-component mixed gas as well as preparation method and application of methanol catalyst

The invention discloses a catalyst applicable to synthesis of methanol by multi-component mixed gas. The methanol catalyst comprises the following components in percentage by mass: 25%-65% of CuO, 20%-40% of ZnO, 15%-35% of Al2O3 and 0-5% of an aid M, wherein the aid M is one or a mixture of more of Zr, Si, La, Mn, Ce, Cr and Ti oxides. Besides, the invention further discloses a preparation method and application of the methanol catalyst. The methanol catalyst has the beneficial effects that the preparation process is simple, the repeatability is good, and the industrial large-scale production is easily realized; the methanol catalyst has the characteristics of being high in specific surface area, easy to form, high in mechanical strength after forming, applicable to multi-component mixed gas of different proportions, high in conversion rate of carbon dioxide and selectivity of methanol and small in generation rate of by-products; by adjusting the constitution proportion of the multi-component mixed gas, the heat release intensity of the catalyst can be adjusted, and therefore, the balance between heat release and heat transfer capacity is achieved, so that the operation stability of the catalyst is achieved, and the service life of the catalyst is prolonged.
Owner:SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products