80results about How to "Fast conversion rate" patented technology

The present invention relates to a process for converting a multihydroxylated-aliphatic hydrocarbon or ester thereof to a chlorohydrin, by contacting the multihydroxylated-aliphatic hydrocarbon or ester thereof starting material with a source of a superatmospheric partial pressure of hydrogen chloride for a sufficient time and at a sufficient temperature, and wherein such contracting step is carried out without substantial removal of water, to produce the desired chlorohydrin product; wherein the desired product or products can be made in high yield without substantial formation of undesired overchlorinated byproducts. In addition, certain catalysts of the present invention may be used in the present process at superatmospheric, atmospheric and subatmospheric pressure conditions with improved results.

The invention discloses an alternating current synchronous collecting system and an achieving method thereof. The alternating current synchronous collection system comprises a signal collecting unit, a global position system (GPS) clock synchronization unit, a signal processing unit and a main controller. The signal collecting unit is used for carrying out level switch for to-be-sampled alternating current parameters respectively through a voltage transformer and a current transformer, and inputting the alternating current parameters to each analog-digital converter after carrying out signal conditioning to the alternating current parameters after the level switch. The GPS clock synchronization unit is used for providing synchronous collecting frequency for each analog-digital converter. The signal processing unit is respectively connected with the signal collecting unit and the GPS clock synchronization unit and composed of a plurality of analog-digital converters and the main controller connected with each analog-digital converter through a data bus, wherein each analog-digital converter is used for carrying out analog-digital conversion to the alternating current parameters for generating digital quantity sample data. The main controller is used for reading the sample data through the data bus. According to the alternating current synchronous collection system and the achieving method thereof, sampling accuracy is high, conversion rate is quick, collecting quantity is large, instantaneity is good, and communication speed and data capacity of the system are improved.

The invention discloses a quick transient response CMOS (Complementary Metal Oxide Semiconductor) low-dropout regulator. The inverted input end of an error amplification circuit is connected with reference voltage Vref, the in-phase input end of the error amplification circuit is connected with the sampling output end Vf of a sampling resistor circuit, and the output end of the error amplification circuit is connected with the gate of a power tube through a conversion rate increasing circuit. The positive power end of the error amplification circuit, the positive power end of the conversion rate increasing circuit and the source of the power tube are connected to form the input end Vin of a regulator body. The drain of the power tube and the positive power end of the sampling resistor circuit are connected to form the output end Vout of the regulator body. The negative power end of the error amplification circuit, the negative power end of the conversion rate increasing circuit and the negative power end of the sampling resistor circuit are connected to form the ground end GND of the regulator body. The quick transient response CMOS low-dropout regulator is higher in conversion rate and quicker in transient response.

The invention relates to a heatproof trehalose synthase fusion enzyme mutant gene and an application thereof. On the basis of optimized trehalose synthase of streptomyces roseus, an amino acid sequence capable of improving heat stability is linked to a C-end to construct to obtain a new fusion enzyme mutant; optimal reaction temperature of the trehalose synthase fusion enzyme mutant is increased from 20-25 DEG C to 50-55 DEG C, heat stability is also improved, yield of trehalose from catalytic maltose is 79% and higher than that, of 67%, of trehalose from Thermus thermophilus trehalose synthase, and the rehalose synthase fusion enzyme mutant is more beneficial for reducing production cost of the trehalose.

The invention provides a mutant cephalosporin C acylase. One or a plurality of amino acid locus replacement is carried out on an amino acid sequence shown as SEQ ID NO.1 in a sequence table to obtain a mutant amino acid sequence; and one or more of 288-locus valine, 296-locus histidine and 417-locus histidine is or are adopted as amino acid locus(es). The technical problems that the mutant cephalosporin C acylase of the prior art has small catalytic activity, seriously influenced enzymatic activity by the outside and product inhibition are solved.

A solid state method for converting polycrystalline alumina components to single crystal or sapphire. The single crystal conversion method includes sintering a pre-fired polycrystalline alumina component doped with a magnesia sintering aid in an atmosphere containing a gas mixture of hydrogen and an inert gas, such as nitrogen in one embodiment. A sintering temperature is selected that preferably depends on the percentage of hydrogen selected. The component is held at the sintering temperature for a time sufficient to convert the polycrystalline component into a component formed of a single crystal. In one embodiment, the sintering temperature may be between at least about 1600° C. and less than 2050° C., and the amount of hydrogen in the sintering atmosphere may be between about 4% to about 10%. The method forms a wetting type intergranular film associated with the nucleation and growth of a single abnormal grain in the polycrystalline alumina component.

The invention belongs to the technical fields of chemical food and biological medicine and relates to a preparation method of partial glyceride. The method is characterized by comprising the following steps: mixing glycerin and catalyst to form glycerin-catalyst mixed solution, wherein the catalyst refers to alkali catalyst or enzyme catalyst; separately preheating raw material oil and the glycerin-catalyst mixed solution to 30-200 DEG C according to a ratio of raw material oil to glycerin, pumping the two materials in a fiber reactor at the same time, controlling the temperature of the fiber reactor to 0-200 DEG C, controlling the reaction temperature, using the mixed solution obtained by the reaction to perform molecular distillation or vacuum distillation and obtain monoglyceride and diglyceride. In the preparation method, the raw material oil and glycerin realizes liquid film contact on the surface of fiber in the fiber reactor, ester exchange reaction is performed under the action of the catalyst to prepare partial glyceride; and the reaction system is used to couple the reaction and separation step and ensure that the reaction is shifted in the direction of the product. Fiber contact is adopted to increase the contact area of the reactants, thus the reaction time can be shortened and the conversion rate and the separation efficiency can be increased.

Disclosed is a process for preparing C9 modified C5 petroleum resin, which comprises using C5 as the main raw material, using C9 as the modifying raw material, charging C9 active fraction into C5 active fraction, preparing C9 modified C5 petroleum resin, using AlCl3 as catalyst for copolymerizing C5, C9 petroleum resin.

The invention discloses a method for decomposing high-concentration methane mixed gas by fast photocatalysis by using low pressure mercury lamp. According to the invention, photocatalysis decomposing of methane is implemented by using a low pressure mercury lamp (dominant wavelength is 253.7nm) as light source and TiO2 as catalyst in a manner of intermittent illumination, i.e. the lamp is turned on for a certain time, then turned off for a period of time and turned off once again. The method for decomposing high-concentration methane mixed gas by fast photocatalysis by using low pressure mercury lamp realizes 78-92% of the conversion rate and 10.15-884mg / of the conversion speed, and has the advantages of fast conversion speed, high conversion rate, low conversion cost, etc.

The invention relates to methods and systems for selective removal of catalyst residue from a depolymerization product stream without a water quench, as well as methods and systems for subsequent recovery of residual linear oligomer. The substantially metal-free and substantially water-free residual oligomer byproduct can then be advantageously used as recyclate in a process for preparing MPO. For example, the residual oligomer recyclate can be used as a reactant in the polymerization and subsequent depolymerization (cyclization) of low-acid polyester to form MPO.

The invention discloses a method of using sulfite enhanced divalent copper to catalyze persulfate oxidation to degrade organic pollutants. Due to the reducing performance of sulfite, the conversion ofdivalent copper ions into monovalent copper ions is promoted; the yield of sulfate radicals is increased, and the degradation efficiency of organic pollutants is improved. The water treatment comprises following steps: adjusting the pH value to 6-11; adding a certain amount of divalent copper ions into a water sample to be processed, then adding a certain amount of a potassium sulfate solution and a sodium sulfite solution, fully stirring and mixing, and carrying out reactions for 5 to 30 minutes to effectively degrade the organic pollutants. The problems of a conventional divalent copper catalyzed persulfate system such as long start period, low yield of sulfate radicals, a large amount of added divalent copper ions, a large amount of generated sludge, and the like are solved. At the same time, the method has the advantages of high active group yield, good organic pollutant removing efficiency, convenient operation, and low operation cost.

The invention relates to the field of conjugated diene polymer preparation, and provides a conjugated diene polymer, a preparation method thereof, polybutadiene and polyisoprene. The preparation method is a continuous polymerization reaction of conjugated diene in a continuous polymerization reaction device comprising a plurality of reaction kettles which are connected in series, and comprises the following steps: introducing reaction materials containing a first-part conjugated diene monomer, a solvent, a gel inhibitor, a polarity modifier and a single organic lithium initiator from a first kettle of the continuous polymerization reaction device under anionic polymerization conditions to the continuous polymerization reaction device and performing first continuous polymerization reaction; and introducing a second-part conjugated diene monomer to a last kettle of the continuous polymerization reaction device, and performing secondary continuous polymerization reaction in the last kettle, wherein the highest temperature of the secondary continuous polymerization reaction is 110-160 DEG C. According to the invention, the conjugated diene polymer with a relatively-wide molecular weight distribution can be obtained by using the method provided in the invention.

The invention relates to a low-carbon alkane dehydrogenation catalyst and a preparation method thereof. The low-carbon alkane dehydrogenation catalyst and the preparation method thereof mainly aim at solving the problems that in existing preparation technologies, catalysts are high in carbon deposition speed, the conversion rate is dropped fast in the application process, and the single-pass service life is short. The preparation method comprises the steps that firstly, magnesium, molybdenum and metallic elements of the IV A family in a periodic table of elements are introduced into a silicon-containing carrier through a precipitation method, so that a compound metal oxidate carrier is obtained; then, a platinum component is loaded through an impregnation method, and in other words, the carrier is impregnated in an aqueous solution of soluble salt of platinum; and drying and roasting treatment are conducted, so that the platinum catalyst is obtained. Propane or iso-butane is adopted as a raw material; under the conditions that the reaction temperature ranges from 520 DEG C to 650 DEG C, the reaction pressure ranges from 0.1 MPa to 0.4 MPa, the alkane mass space velocity ranges from 0.1 h<-1> to 7.0 h<-1> and the volume ratio of H2O to CnH(2n+2) ranges from 0.5 to 18, the raw material is in contact with the catalyst; and propylene or isobutene is generated through a reaction. By means of the low-carbon alkane dehydrogenation catalyst and the preparation method thereof, the mentioned problems are well solved; and the low-carbon alkane dehydrogenation catalyst and the preparation method thereof can be applied to industrial preparation of the catalyst for preparing low-carbon olefin by dehydrogenizing the low-carbon alkane.

The invention describes a method of performing analog-to-digital conversion on an input signal (Pin) within a range (R1) using a sigma-delta modulator (1) comprising a feedback digital-to-analog conversion arrangement (12, 120), which method comprises the steps of: obtaining an amplitude estimate (E1, E2, E3, E4) of the input signal (Pin); defining a subsequent subrange (R2, R3, R4) on the basis of the amplitude estimate (E1, E2, E3); and adjusting operation parameters of the feedback digital-to-analog conversion arrangement (12, 120) on the basis of the subsequent subrange (R2, R3, R4); whereby the method steps are repeated a predefined number of iterations (N). The invention further describes a sigma-delta modulator (1), an analog-to-digital converter (50), and a monitoring device (5) for monitoring an analog input signal (Pin).

The invention discloses a feed special for newly-hatched ducklings capable of achieving nutrient balance and low fatality rate. The feed is prepared from, by weight, 20-50 parts of silkworm chrysalis meal, 5-15 parts of rye bran, 8-16 parts of cottonseed cake, 10-18 parts of cornstalk powder, 10-20 parts of cabbage caterpillar dry powder, 5-12 parts of water hyacinth dry powder, 2-6 parts of rice flour, 2-7 parts of doederlein spikemoss herb, 1-2 parts of gravel, 0.1-0.6 part of yeast protein meal, 1-3 parts of fructooligosaccharide, 0.5-1.5 parts of choline chloride, 0.1-0.4 part of vitamin, 0.01-0.06 part of high-temperature-resisting phytase, 2-5 parts of granulesten oil, 1-2 parts of sodium carboxymethylcellulose and 2-7 parts of modified soya bean lecithin. The feed can meet the requirement of meat ducklings 5-20 days old for nutrients, digestive utilization ratio is high, nutrient balance is achieved, and fatality rate can be reduced.

The invention relates to the field of preparation of conjugated diene polymers, and provides conjugated diene polymers and a preparation method thereof, and polybutadiene and polyisoprene. According to the method, a conjugated diene polymerization reaction is performed intermittently in a single reaction kettle; and the conjugated diene polymerization reaction comprises a primary polymerization reaction and a secondary polymerization reaction. The method comprises the following steps: (1) under anionic polymerization conditions, adding a reaction material, which contains a first part of conjugated diene monomer, a polarity regulator, a solvent and a single organic lithium initiator, into a reaction kettle, and performing the primary polymerization reaction, wherein the maximum temperature of the primary polymerization reaction is 80-110 DEG C; and (2) when the maximum temperature of the primary polymerization reaction is achieved, adding a second part of conjugated diene monomer into the reaction kettle, and performing the secondary polymerization reaction, wherein the maximum temperature of the secondary polymerization reaction is 110-160 DEG C. The method provided by the invention can obtain the conjugated diene polymers with wider molecular weight distribution.

The invention discloses a preparation method of a supported Ni-MoCx catalytic material and application of the supported Ni-MoCx catalytic material to prepare synthetic gas by chemical-looping dry gasreforming. The supported Ni-MoCx catalytic material comprises MoCx, a large-specific-surface commercial supporter and metal Ni, wherein MoCx accounts for 25-75% by mass, metal Ni accounts for 2.5-7.5%by mass, and the large-specific-surface commercial supporter mainly comprises gamma-Al2O3, SiO2, CeO2, BN, hydrotalcite and the like and accounts for 22.5-67.5% by mass. An oxygen carrier microscopicstructure is regulated and optimized by using the supported Ni-based catalytic material as a base and introducing the aid transition metal molybdenum carbide material; therefore, efficient methane-to-synthetic gas process is achieved. The supported Ni-MoCx catalytic material herein has excellent H2 / CO ratio (about 2-2.5) suitable for Fischer-Tropsch synthesis and excellent cycle stability, and helps improve energy conversion efficiency.

The invention relates to a light alkane dehydrogenation catalyst carrier and an application thereof and mainly aims at solving the problems of high carbon deposition speed, high conversion ratio reduction speed in a use process and short one-way service life of the catalyst existing in the existing preparation technology. The problems are better solved by the technical scheme: firstly, introducingmagnesium, zirconium and IVA-group metal elements in a periodic table of elements to a silicon-containing carrier by using a precipitation method to obtain a composite metal oxide carrier; then, supporting a platinum metal component by using an impregnation method, namely impregnating a water solution of a soluble salt of platinum, and carrying out drying and roasting to obtain a platinum catalyst; and carrying out reaction by making propane / isobutene as a raw material contact with the catalyst under the conditions that the reaction temperature is 520-650 DEG C, the reaction pressure is 0.1-0.4MPa, the mass space velocity of alkane is 0.1-7.0h<-1> and the volume ratio of H2O / CnH2n+2 is 0.5-18 to produce propene / isobutylene. The light alkane dehydrogenation catalyst carrier can be appliedto industrial preparation of light olefins by light alkane dehydrogenation.

The invention discloses a device and method for treating high-concentration NO3-N wastewater or urban sewage by adopting an improved DEAMOX continuous flow process. Short-process denitrifying granular sludge having good sedimentation performance and anaerobic ammonia oxidized granular sludge are put into a reactor, an oxygen-poor stirring strengthening substrate is added in the continuous flow reactor for mass transfer, and the problem of the poor denitrification effect caused by channeling and dead zone phenomena of a traditional continuous flow reactor is solved. Short-process denitrifying bacteria utilize organic matter and an external carbon source in urban sewage to convert NO3-N into NO2-N, then synchronous removal is performed through anaerobic ammonia oxidation reaction and NH4+-N in the urban sewage, and efficient removal of nitrogen is achieved by optimizing the flow of high-NO3-N-content wastewater, the urban sewage and the carbon source in inflow water. The device is high in nitrogen removal rate and nitrogen removal load, simple in structure and easy to optimize and control, the problem of difficult treatment of the high-NO3-N-content wastewater can be effectively solved, and the purpose of synchronous urban sewage treatment is achieved.

The invention discloses a recombined engineering bacterium for producing UDPG (uridine diphosphate glucose) and application thereof to preparation of validamycin A. The recombined engineering bacterium is formed by transferring the ValG gene in streptomyces hygroscopicus and the GalU gene and the Pgm gene in escherichia coli JM109 into a host bacterium, wherein the ValG gene has a nucleotide sequence as shown in SEQ ID NO:1, the GalU gene has a nucleotide sequence as shown in SEQ ID NO:2, and the Pgm gene has a nucleotide sequence as shown in SEQ ID NO:3. The recombined engineering bacterium can be used for transforming validoxylamine A into validamycin A under the whole cell catalysis, has a high transformation speed in the same time and can achieve a transformation rate of 75%.

The invention relates to the field of conjugated diene and monovinylarene random copolymers, and discloses a conjugated diene and monovinylarene random copolymer, and a preparation method thereof. Thepreparation method includes the following steps that under the condition of anionic polymerization, reaction materials containing the first part of conjugated diene, monovinylarene, solvents, gel inhibitors and single organic lithium initiators are continuously introduced from the first reactor of a continuous polymerization reaction device, the sequential copolymerization reaction is carried outin each reactor of the continuous polymerization reaction device, the second part of conjugated diene is introduced into each reactor, and the polymerization temperature is controlled to be 90-140 DEG C. According to the preparation method, under the conditions that any structural regulators or random agents are not added, the reaction temperature is high, and residence time is reasonable, the conjugated diene and monovinylarene random copolymer can be prepared with controllable basic molecular weight and low vinyl content.

The invention belongs to the technical field of biological crude oil and preparation thereof, and particularly relates to biological crude oil prepared by co-liquefying algae and crude glycerine and a method for preparing the biological crude oil by co-liquefying algae and crude glycerine. The process of the method comprises the following steps of: preparing the biological crude oil by using a high-temperature and high-pressure reaction kettle and taking algae and crude glycerine as raw materials, wherein main control means are temperature, initial pressure and the weight ratio of algae to crude glycerine in an oil production process; after algae and crude glycerine are reacted as the raw materials, extracting, filtering, distilling and drying product residual oil to obtain the biological crude oil. Compared with a method for preparing the biological crude oil by hydrothermally liquefying the algae, the method disclosed by the invention enhances the yield of the biological crude oil from 23.0% to 38.7% and the HHV (High Heat Value) is more than 35 MJ / kg, by taking enteromorpha prolifera as an example; the obtained biological crude oil is black thick liquid, has good flowability and has the hydrocarbon compound content being as high as 45.6%. The method disclosed by the invention is energy-saving, environmental-friendly and easy to operate, not only can enhance the yield and quality of the biological crude oil, but also can sufficiently utilize the biomass resources.

The invention discloses a system and method for preparing ammonia by SCR denitration urea heterogeneous catalytic hydrolysis, the system comprises a urea solution storage tank (1), an A urea solution delivery pump (2), a heterogeneous hydrolysis reactor (3) and a steam pipeline (4), and the heterogeneous hydrolysis reactor (3) adopts a tubular fixed bed reactor; wherein the urea solution storage tank (1) is connected with the heterogeneous hydrolysis reactor (3) through the A urea solution delivery pump (2) and a pipeline, and the steam pipeline (4) is connected with the heterogeneous hydrolysis reactor (3). The hydrolysis ammonia production system is simple in structure, a fixed bed tubular reactor is adopted, a urea solution is hydrolyzed under the action of a solid catalyst to generate ammonia gas and carbon dioxide, and the reaction is a liquid-solid two-phase reaction. At present, when most devices corresponding to urea homogeneous catalytic hydrolysis process reactions are modified, the system responsiveness can be improved, the system operation cost is reduced, and the waste liquid discharge amount is reduced.

The invention provides a preparation method of polymethyl methacrylate with narrow molecular weight distribution, and belongs to the field of preparation methods of high polymer material. The problems that the existing preparation method of polymethyl methacrylate with narrow molecular weight distribution is complex in process, rigor in polymerization condition and long in polymerization period are overcome. The method includes that: methyl methacrylate, solvent and initiator are put into a reaction vessel for reacting for 60-180min at the temperature of 90DEG C-180 DEG C, and thereby the polymethyl methacrylate with narrow molecular weight distribution is obtained; the solvent is dialkyl imidazole ionic liquid. According to the preparation method, the dialkyl imidazole ionic liquid is used as the solvent, so that the polymethyl methacrylate with narrow molecular weight distribution is obtained by high temperature polymerization; furthermore, the preparation method is simple and quick in reaction speed; the materials can be directly used without pretreatment, and the molecular weight distribution index of the prepared polymethyl methacrylate is 1.0-1.3.

The invention discloses a health diagnosis device for a high-speed railway locomotive. The health diagnosis device comprises a power supply module, a signal pre-processing module, an A / D converter, an ARM processor, a state display module, a sound-light alarm module and a network communication module, wherein the power supply module is electrically connected with the signal pre-processing module, an A / D converter module, the ARM processor and the state display module mutually; an acceleration sensor and a piezoelectric sound emission sensor are arranged in the signal pre-processing module; the network communication module is connected with the ARM processor; a WIFI interface is arranged in the network communication module; the sound-light alarm module is connected with the state display module; and the sound-light alarm module is composed of an alarm lamp and a high-loudness alarm. The health diagnosis device disclosed by the invention has the functions of remotely monitoring, detecting and judging health states of robot joints, and timely cutting off power of a robot before faults occur.