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

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 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 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.

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.

A successive approximation analog / digital converter converting an analog input signal into a digital output value by means of a plurality of successive conversion cycles, comprises at least one first input for injecting an analog input signal, a controllable capacitive network which is connected downstream of the first input and which is divided into at least two capacitive subnetworks and, at least two parallel-connected and parallel-operating comparators for defining a number of comparator thresholds which corresponds to the number of parallel comparators. The comparators are respectively connected downstream of one of the capacitive subnetworks and the comparators output a corresponding number of digital intermediate signals on the basis of the comparisons in the comparators. The analog / digital converter further comprises a register set by the intermediate signals. The register buffer-stores digital intermediate values for the respective intermediate signals and produces control signals for actuating the capacitive subnetworks in response to the content of the intermediate signals.

The present invention relates to a process for converting a multihydroxylated-aliphatic hydrocarbon or ester thereof to a chlorohydrin, more specially relates to a process for producing a chlorohydrin, an ester of a chlorohydrin, or a mixture thereof, which includes steps of: contacting a multihydroxylated-aliphatic hydrocarbon, an ester of a multihydroxylated-aliphatic hydrocarbon, or a mixture thereof with a source of an atmospheric or subatmospheric partial pressure of hydrogen chloride to produce a chlorohydrin, an ester of a chlorohydrin, or a mixture thereof, in the presence of a catalyst, wherein the catalyst: (i) is a carboxylate derivative having from two to about 20 carbon atoms and containing at least one functional group selected from the group comprising an amine, an alcohol,a halogen, an sulfhydryl, an ether, an ester, or a combination thereof, wherein the functional group is attached no closer to the acid function than the alpha carbon; or a precursor thereto; (ii) is less volatile than the chlorohydrin, ester of a chlorohydrin, or a mixture thereof; and (iii) contains heteroatom substituents.

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 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 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.