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Preparation method of polycarbonate
The invention provides a preparation method of polycarbonate. The method comprises the following step of performing copolymerization on carbon dioxide and epoxide under the effects of a main catalyst and a cocatalyst so as to obtain the polycarbonate, wherein the main catalyst has a formula I structure; the cocatalyst comprises one or a plurality of kinds of quaternary ammonium salt, quaternary microcosmic salt and organic alkali; the amount ratio of substances of the main catalyst to the substances of the cocatalyst is 1:(0.2-4). Compared with the prior art, by the preparation method, aluminum porphyrin compositions are adopted as the main catalyst, the electronic environment of aluminum in a metal active center is regulated by changing a substituent group, so that the electronic environment has a higher activity in the copolymerization of the carbon dioxide and the epoxide; in addition, the main catalyst has a higher product selectivity in the copolymerization, and the molecular weight of the obtained polycarbonate is higher. The experimental result indicates that the transforming amount of a catalytic system can be as high as 5563 h<-1> when the copolymerization of the carbon dioxide and the epoxide are catalyzed by the aluminum porphyrin compositions.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Crystallizable polycarbonate material based on carbon dioxide and preparation method thereof
The invention belongs to the field of high molecular materials and relates to a crystallizable polycarbonate material based on carbon dioxide and a preparation method thereof. The crystallizable polycarbonate material based on carbon dioxide is characterized in that carbon dioxide and cyclohexene oxide are copolymerized into a crystallizable polycarbonate material with a highly identical stricture under the action of a catalyst. The polycarbonate material has the following characteristics that the content of polycarbonate units in a polymer chain is 90-100%, the identical structure of the polymer is between 88.0% and 99.9%, the tested selectivity of an enantiomer of diol is between 88.0% and 99.9% after the polymer is hydrolyzed with a sodium hydroxide aqueous solution, and the crystallizable polycarbonate material can be obtained after the polymer is subjected to simple thermal treatment. The polycarbonate material provided by the invention has the advantages of high crystallization, high clarity and the like.
Owner:DALIAN UNIV OF TECH
Preparation method of porphyrin aluminum complex and preparation method of polycarbonate
InactiveCN105753894AIncreased polycarbonate unit contentHigh content of polycarbonate unitsGroup 3/13 element organic compoundsPorphyrinEther
The invention provides a porphyrin aluminum complex with a structure as shown in a formula (I) or a formula (II), a preparation method of the porphyrin aluminum complex, and a preparation method of polycarbonate. Under the catalysis of a main catalyst and a cocatalyst of the porphyrin aluminum complex provided by the invention, carbon dioxide and epoxide are subjected to copolymerization, so that the polycarbonate is obtained. In a copolymerization process, the porphyrin aluminum complex participates in the reaction process and serves as the main catalyst, the porphyrin aluminum complex has high catalytic activity and particularly has excellent chemistry selectivity (which is greater than 99%), and the polycarbonate with low ether segments and high alternation is prepared.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Polyester resin and method for producing the same
The present invention provides a polyester resin having 1,4-CHDA as the main dicarboxylic acid units, having isomerization of trans-1,4-CHDA suppressed in the esterification and polyconsensation reactions and having a high melting point and excellent heat resistance, and a process for its production. A polyester resin obtainable by preparing an oligomer by an esterification reaction of a dicarboxylic acid component containing 1,4-cyclohexane dicarboxylic acid as the main component, with a diol component, and polycondensing this oligomer in the presence of a polycondensation catalyst; and a process for producing a polyester resin characterized in that the esterification reaction is carried out by means of a basic compound, and then, the polycondensation reaction is carried out by means of a polycondensation catalyst. In the resent invention, T0 and Tp satisfy 0 |{(T0-Tp) / T0}100 |12 where T0 is the mol% of the trans form in the 1,4-cyclohexane dicarboxylic acid contained in the starting material, and Tp is the mol% of the trans form in the 1,4-cyclohexane dicarboxylic acid units contained in the obtainable polyester resin.
Owner:MITSUBISHI CHEM CORP
Method for producing transfer factor in scale
ActiveCN103054902AImprove broken rateLarge batch capacityAntibacterial agentsAntiviralsSpleen cellSlurry
The invention relates to a method for extracting transfer factors from animal spleens, and mainly aims at providing a method which is applicable to in-scale transfer factor production. The method comprises the following steps of firstly crushing spleen cells to prepare a homogenate, secondly eliminating cell residues in the homogenate, and subsequently extracting the transfer factors, wherein the step of eliminating the cell residues in the homogenate comprises adjusting the pH value to 7.2, adding polyaluminium chloride into the homogenate according to a mass volume ratio of 1%, uniformly stirring, acting for 30 minutes, centrifuging for not less than 30 seconds, repeating centrifuging for three times, adding 0.5% of, 0.4% of and 0.1% of polyaluminium chloride according to the mass volume ratio each time, all uniformly stirring after adding polyaluminium chloride, acting for 30 minutes, primarily filtering the centrifugate, and finely filtering the primary filtrate by using a filtering film with a filtering precision of 0.2 microns so as to obtain the transfer factors. According to the method, the polyaluminium chloride sediment is adopted to eliminate the spleen cell residues in a breakthrough, so that the production method is applicable to in-scale production of transfer factors which are high in effective content and good in biological activity.
Owner:重庆永健生物技术有限责任公司
Preparation method of semi-aromatic polythioesters
The invention provides a preparation method of semi-aromatic polythioesters, and belongs to the technical field of polymeric materials. The method comprises the following steps: adding alkylene oxide,thiophthalic anhydride, a catalyst and a cocatalyst into a dry reaction container, carrying out a reaction at 0-40 DEG C for 0.5-24 h, and purifying and drying the obtained reaction product to obtainthe semi-aromatic polythioesters. Compared with previously reported polythioester preparation methods, the method provided by the invention has the advantages of cheap and easily available raw materials, large variety number of products, and simplicity and easy operation of a polymerization process. The generated semi-aromatic polythioesters have good thermal stability and good refractive index,and have potential uses in the field of special optical materials.
Owner:DALIAN UNIV OF TECH
Supported double-metal cyanide catalyst and preparation method and application thereof
The invention discloses a supported double-metal cyanide catalyst and a preparation method and application thereof. The supported double-metal cyanide catalyst uses hydrotalcite as the supporter, double-metal cyanide is supported on the supporter, and the supported double-metal cyanide catalyst uses polyethylene glycol as the chelating agent. The preparation method includes: using zinc chloride and metal cyanide as precursors, dripping the aqueous solution of central metal into a ligand substance solution for reaction, adding the supporter and the chelating agent at the same time, and performing centrifugal separating and drying to obtain the supported double-metal cyanide catalyst. The invention also provides a preparation method using the supported double-metal cyanide catalyst to prepare carbon dioxide-epoxide copolymer. Compared with same-type catalysts, the supported double-metal cyanide catalyst has the advantages that the catalyst is high in catalyzing activity and good in product selectivity; when the catalyst catalyzes carbon dioxide to have copolymerization reaction with epoxides, the carbonic ester unit content of the copolymerization product is high, the cyclic carbonate content of the copolymerization product is low, and the catalyst is high in actual application value and promising in market prospect.
Owner:YANCHENG INST OF TECH
Titanium catalyst as well as preparation method and application of titanium catalyst
ActiveCN104226366AHigh unit contentEfficient copolymerizationOrganic-compounds/hydrides/coordination-complexes catalystsTitanium organic compoundsTitaniumPolycarbonate
The invention provides a titanium catalyst with a structure represented by the formula (I). The catalyst can be efficiently copolymerized with a catalytic epoxy compound and carbon dioxide and is high in selectivity; furthermore, polycarbonate prepared by the catalyst provided by the invention has a non-toxic effect and can be applied to the field of food and medical packaging.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Preparation method of recyclable surface film of inferior vena cava filter based on (PEG) polyethylene glycol-like
InactiveCN102330059BDeposition does not occur easilyNot easy to disengageVacuum evaporation coatingSputtering coatingTetraglycolSputter cleaning
The invention discloses a preparation method of a recyclable surface film of an inferior vena cava filter based on (PEG) polyethylene glycol-like, which comprises the following steps of: feeding the inferior vena cava filter in a plasma polymerization vacuum chamber; when the vacuum degree reaches 0.5Pa, introducing argon gas with the flow of 2.5sccm and carrying out sputter cleaning for 15 minutes under the conditions that the radio-frequency power is 100W and the negative bias voltage is 80V; after the sputter cleaning is finished, vacuumizing the vacuum chamber to be 0.5Pa again; and introducing a reacting gas of tetraglycol dimethyl ether and depositing a plasma polymer thin film for 30-120 minutes under the conditions that the work pressure is 2-5Pa, the radio-frequency power is 5-30W, the negative bias voltage is 80V and the pulse duty factor is 10-100 percent. The inferior vena cava filter prepared by the method disclosed by the invention has strong binding force between the surface-like PEG thin film layer and the inferior vena cava filter and excellent bioremediation performance for resisting protein and cell from adhering.
Owner:CHENGDU SOUTHWEST JIAOTONG UNIV SCI & TECH GARDEN MANAGEMENT +1
Carbon dioxide based high polymer material with crystallization performance
InactiveCN102786677AHigh unit contentNarrow molecular weight distributionPolymer scienceCarbonate ester
The invention belongs to the field of the high polymer material, which relates to a class of carbon dioxide based high polymer material with the crystallization performance. The carbon dioxide based high polymer material with the crystallization performance is characterized in that end position alkyleneoxide containing an electrophilic group and carbon dioxide are copolymerized to form crystallizable polycarbonate material with an identical height structure under the action of catalyst. The polycarbonate has the following characteristics that the content of a carbonate ester unit in a polymer chain is 90-100%, and the identical structure of the polymer is between 80.0% and 99.9%; after the polymer is hydrolyzed by sodium hydroxide aqueous solution, the enantiomer selectivity of glycol obtained by measurement is 80.0% and 99.9%; and the polycarbonate with the crystallization performance can be obtained through carrying out simple thermal treatment on the polymer. The polycarbonate material provided by the invention has the advantages of big possibility of crystallizing, strong thermal deformation resistance and the like.
Owner:DALIAN UNIV OF TECH
Nanometer water ion air purifier
ActiveCN106000040APrevent oxidationPrevent drynessGas treatmentDispersed particle separationAir purifiersEngineering
The invention provides a nanometer water ion air purifier and relates to the field of air purification. The air purifier comprises a shell, a draught fan, an air purifying module and a nanometer water ion generation device. An air inlet is formed in the bottom of the shell, an air outlet is formed in the upper portion of the shell, and an air channel is defined in the shell by the air inlet and the air outlet. The draught fan in the air channel is used for introducing external air from the air inlet and delivering out the air from the air outlet. The air purifying module arranged in the air inlet section of the air channel is used for purifying the external air entering the air channel from the air inlet. The nanometer water ion generation device is arranged in the air outlet section of the air channel and used for generating nanometer-order particle size water ions. The nanometer water ion air purifier can stimulate a large quantity of nanometer water ions with negative charges, rich reduction substances are contained, the nanometer water ions containing the reduction substances can suppress oxidation of the skin and the surface and interior of the hair to prevent the issues of skin and hair dryness, hair split ends and the like while the external air is purified, and thus the purposes of beautifying, hair maintenance and lung clearing are achieved.
Owner:HANGZHOU DAZHAN ELECTROMECHANICAL TECH CO LTD
Amorphous duplex-metal cyanide catalyst and preparation method and application thereof
The invention discloses amorphous duplex-metal cyanide catalyst and a preparation method and application thereof. The catalyst is a three-dimensional net-shaped amorphous complex, the complex is prepared from internal metal MII and external metal MI, and the internal metal MII and the external metal MI are connected through a cyano group. The preparation method comprises the steps: mixing an oil phase with a water phase to be prepared into reversed-phase microemulsion, adding a surface active agent and a cosurfactant, adding a precursor zinc chloride and metal cyanide respectively, evenly stirring to prepare mixed solution A and mixed solution B, the adding the mixed solution B into the mixed solution A, performing ultrasonic reaction, separating, performing soxhlet extraction washing and drying. The catalyst has the advantages of having a higher specific surface area, enlarging a contact area with a substrate, increasing active sites and enhancing catalytic activity. The preparation method is simple and environment-friendly and reduces production cost. In addition, the catalyst is applied to catalytic copolymerization reaction, the carbonic ester unit content of the obtained copolymer is high, the cyclic carbonate content is low, and the obtained copolymer has a lower molecular weight.
Owner:YANCHENG INST OF TECH
Preparation method of streptococcal enzyme capsule
InactiveCN109043529AHigh unit contentPromote absorptionYeast food ingredientsFood shapingSparassis crispaFreeze-drying
The invention discloses a preparation method of a streptococcal enzyme capsule. The method is characterized in that the capsule is packed and can be released at a fixed point in small intestine duringeating, and sparassis crispa polysaccharide cannot be damaged by gastric acid, and thus the bioavailability of the sparassis crispa polysaccharide is improved; and meanwhile, the addition of a largenumber of corrigents can be avoided, and the unit content of streptococcal enzyme is obviously increased; the streptococcal enzyme grinded by a plurality of steps can be better absorbed by small intestine after being released; various beneficial components in the streptococcal enzyme can be prevented from being damaged by an ultralow-temperature freeze drying technique; and the packed streptococcal enzyme capsule is convenient to carry and eat in daily life.
Owner:FUQING CITY FIRE KIRIN EDIBLE FUNGUS TECH DEV
Method for continuously producing polycarbonate-polyether polyol in channelization mode through preheating liquid phase method
The invention discloses a method for continuously producing polycarbonate-polyether polyol in a channelization mode through a preheating liquid phase method, which comprises the following steps of (1)feeding raw materials including an epoxy compound, a catalyst and a chain transfer agent into a premixing tank according to a certain proportion, uniformly mixing, and pumping into a channelization reactor, (2) preheating carbon dioxide to 50-120 DEG C, pumping the preheated carbon dioxide into the channelization reactor from an inlet of the channelization reactor, and pressurizing to 1-15 MPa, (3) heating to 70-150 DEG C, enabling the chain transfer agent, the epoxy compound and carbon dioxide to be in contact in the channelization reactor in the presence of a catalyst, and carrying out polymerization reaction, (4) enabling part or all of the polymerization reaction product material flow in the step (3) to flow through a cooling section group, separating out part of polycarbonate-polyether polyol, and circulating the rest of the polymerization reaction product material flow to the step (1), the catalyst being modified by a mixed acid, and being obtained by reacting water-soluble metal salts of zinc and cobalt in a water-soluble solvent.
Owner:HANGZHOU POLY MATERIAL SCI & TECH CO LTD
Catalyst for preparing polyol as well as preparation method and application of catalyst
ActiveCN112625231AIncreased content of carbonate unitsLow content of carbonate unitsCyanide compoundPolymer science
The invention relates to the technical field of catalysts, in particular to a catalyst for preparing polyol as well as a preparation method and application of the catalyst. The preparation method of the catalyst for preparing polyol comprises the following steps: under the action of a first initiator, carrying out polymerization reaction on double metal cyanide and epoxide to obtain the catalyst for preparing polyol, wherein the first initiator comprises one or more of an active hydrogen-containing compound and an active hydrogen-containing polymer. The catalyst prepared by the invention can be used for copolymerization of carbon dioxide and epoxide, and the obtained copolymerization product has high carbonate unit content and low cyclic carbonate content.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Efficient extraction and separation technology for effective ingredients of peppers
The invention relates to an extraction method of effective ingredients of peppers, in particular relating to an efficient extraction and separation technology for effective ingredients of peppers, comprising the following steps: (1) pulverization: pulverizing pepper raw materials at the temperature of 0-5 DEG C; (2) extraction and separation of the aroma ingredient of the peppers: adding pepper powder into an extraction kettle, and carrying out variable frequency ultrasonic extraction; causing mixed gas to successively enter an analytical kettle 1 and an analytical kettle 2 to collect the aroma ingredient of the peppers; and (3) extraction and separation of the spicy ingredient of the peppers: lowering the pressure of the extraction kettle to be less than or equal to 7.3MPa, then slowly raising the extraction pressure to 25-30MPa, maintaining ultrasonic frequency of 10-50khz, power of 1200w, the pressure of the analytical kettle 1 of 6-8MPa, and the pressure of the analytical kettle 2 of 4-6MPa; and collecting the numb-taste components of the peppers. The extraction method has the advantages that the process is simple, no organic solvent is adopted, and a pure physics method is adopted for extraction, and the obtained product is high in yield and high in unit content.
Owner:CHENGUANG BIOTECH GRP CO LTD
Method for continuously producing polycarbonate-polyether polyol in channelization mode through liquid phase method
ActiveCN111349224AIncreased content of carbonate unitsImprove mass and heat transfer capacity and effectChemical recyclingOrganic acidEpoxide Compound
The invention discloses a method for continuously producing polycarbonate-polyether polyol in a channelization mode by a liquid phase method, wherein the method comprises the following steps: (1) pumping a raw material from an inlet of a channelization reactor, making an initiator, an epoxy compound and carbon dioxide contact in the channelization reactor in the presence of a catalyst, and carrying out polymerization reaction; and (2) enabling part or all of the polymerization reaction product material flow in the step (1) to flow through a cooling section group, separating out part of polycarbonate-polyether polyol, and continuing to carry out polymerization reaction on the rest of the polymerization reaction product material flow in the channelization reactor, or circulating back to thestep (1), wherein the catalyst is a zinc-cobalt double-metal cyanide complex catalyst obtained by reacting water-soluble metal salts of zinc and cobalt in a water-soluble solvent, when the catalyst issynthesized, the catalyst is modified by mixed acid, and the organic acid is selected from any one or more of succinic acid, glutaric acid, phthalic acid, iminodiacetic acid, pyromellitic acid and butane tetracarboxylic acid.
Owner:HANGZHOU POLY MATERIAL SCI & TECH CO LTD
Polyester resin and method for producing the same
The present invention provides a polyester resin having 1,4-CHDA as the main dicarboxylic acid units, having isomerization of trans-1,4-CHDA suppressed in the esterification and polyconsensation reactions and having a high melting point and excellent heat resistance, and a process for its production. A polyester resin obtainable by preparing an oligomer by an esterification reaction of a dicarboxylic acid component containing 1,4-cyclohexane dicarboxylic acid as the main component, with a diol component, and polycondensing this oligomer in the presence of a polycondensation catalyst; and a process for producing a polyester resin characterized in that the esterification reaction is carried out by means of a basic compound, and then, the polycondensation reaction is carried out by means of a polycondensation catalyst. In the resent invention, T0 and Tp satisfy 0 |{(T0-Tp) / T0}100 |12 where T0 is the mol% of the trans form in the 1,4-cyclohexane dicarboxylic acid contained in the starting material, and Tp is the mol% of the trans form in the 1,4-cyclohexane dicarboxylic acid units contained in the obtainable polyester resin.
Owner:MITSUBISHI CHEM CORP
Method for extracting lentinan by two-step enzyme, lentinan extract and application of lentinan extract
PendingCN112094878APromote dissolutionImprove permeabilityOrganic active ingredientsNervous disorderAnimal testingCellulase
The invention relates to a method for extracting lentinan by a two-step enzyme, a lentinan extract and application of the lentinan extract. The method comprises the following steps: first conducting extraction by using cellulase and an ethanol activator at 35-45 DEG C, carrying out secondary extraction on the slag by using purified water, merging the extracting solutions, regulating the pH value to about 6-6.8, standing at 40-50 DEG C, carrying out polymerization reaction for more than 12 hours, removing the precipitate, carrying out vacuum concentration on the supernatant to obtain an extractwith the specific gravity of 1.2-1.25, and finally carrying out drying under the condition of the upper temperature limit <= 60 DEG C, and the lower temperature limit >= 50 DEG C. The method is convenient for industrial implementation, the polysaccharide yield and the unit content are remarkably improved, the extract is a water full-soluble substance, and effective components in the raw materialsare reserved to the maximum extent. Cell and animal tests prove that the lentinan extract has a good prevention and treatment effect on Parkinson's disease.
Owner:周银根
Health care food and making method thereof
InactiveCN1568819AHigh unit contentImprove immunityUnknown materialsCapsule deliveryGanoderma lucidumHealth food
Owner:云南新云三七产业有限公司
Industrial production method of rough glycyrrhizic acid
The invention discloses an industrial production method of rough glycyrrhizic acid. The industrial production method comprises the following steps: drawing liquorice roots into shreds or powder through a drawing machine; extracting by taking hot water as an extracting solvent to obtain an extracting solution; cooling extracted material liquid; after finishing cooling, centrifuging to obtain clarified material liquid; carrying out acid regulation on the centrifuged material liquid in an acid tank; after finishing the acid regulation, standing and carrying out acid precipitation for 2h to 5h; filtering material liquid subjected to the acid precipitation; washing a filtered solid with water to obtain a wet product; drying the wet product to obtain a rough glycyrrhizic acid product. By adopting hot water countercurrent circular extraction and combining a cooling and impurity removing process, a water resource is saved and the extraction rate of the product is guaranteed; a post-period purification process is simple and easy to operate and the unit content of the obtained rough glycyrrhizic acid product is more than or equal to 45 percent; industrial production is easy to realize.
Owner:CHENGUANG BIOTECH GRP CO LTD
Poly (carbonate-ether) polyol and preparation method thereof
The invention discloses poly (carbonate-ether) polyol and a preparation method thereof, and belongs to the technical field of polymer preparation. According to the preparation method, through design synthesis of a bimetallic catalyst, under the carbon dioxide pressure condition, the bimetallic catalyst is used for catalyzing an epoxy compound and a chain transfer agent to be subjected to a polymerization reaction, poly (carbonic ester-ether) polyol is obtained, and therefore efficient preparation of carbon dioxide-based polyols with different molecular weights is achieved. The content of carbonate units in the prepared polyol is controllable, and the content of cyclic carbonate by-products is extremely low.
Owner:YANTAI UNIV
Method for continuously producing polypropylene carbonate by preheating liquid phase method in channelization manner
The invention discloses a method for continuously producing polypropylene carbonate by a preheating liquid phase method in a channelization manner, which comprises the following steps: (1) feeding rawmaterials including propylene oxide and a catalyst into a premixing tank according to a certain proportion, uniformly mixing, and pumping into a channelization reactor; (2) preheating carbon dioxideto 40-150 DEG C, pumping into a channelization reactor, and pressurizing to 1-15 MPa; (3) heating to 70-150 DEG C to enable epoxypropane and carbon dioxide to be in contact in a pipelined reactor in the presence of a catalyst, and carrying out a polymerization reaction; (4) after part or all of the polymerization reaction product material flow flows through a cooling section group, separating outpart of the polypropylene carbonate from the polymerization reaction product material flow, and circulating the rest of the polymerization reaction product material flow to the step (1); wherein the catalyst is modified by mixed acid, and the zinc-cobalt double metal cyanide complex catalyst is obtained by reacting water-soluble metal salts of zinc and cobalt in a water-soluble solvent.
Owner:HANGZHOU POLY MATERIAL SCI & TECH CO LTD
Aliphatic polythioester preparation method
The invention belongs to the field of high polymer materials and particularly relates to an aliphatic polythioester preparation method. Raw materials including epithioalkane and aliphatic thioanhydride and an initiator namely quaternary ammonium salt are subjected to bulk polymerization or solution polymerization reaction, wherein the reaction temperature is 0-120 DEG C, and reaction time is 0.1-24h. The method has advantages of precision in polymer structure control, product diversification, simplicity and easiness in operation of a polymerization method and the like, and generated aliphaticpolythioester is high in thermal stability and refractive index and has a potential application in the field of special optical materials.
Owner:DALIAN UNIV OF TECH
A kind of supported double metal cyanide catalyst, preparation method and application
The invention discloses a supported double-metal cyanide catalyst and a preparation method and application thereof. The supported double-metal cyanide catalyst uses hydrotalcite as the supporter, double-metal cyanide is supported on the supporter, and the supported double-metal cyanide catalyst uses polyethylene glycol as the chelating agent. The preparation method includes: using zinc chloride and metal cyanide as precursors, dripping the aqueous solution of central metal into a ligand substance solution for reaction, adding the supporter and the chelating agent at the same time, and performing centrifugal separating and drying to obtain the supported double-metal cyanide catalyst. The invention also provides a preparation method using the supported double-metal cyanide catalyst to prepare carbon dioxide-epoxide copolymer. Compared with same-type catalysts, the supported double-metal cyanide catalyst has the advantages that the catalyst is high in catalyzing activity and good in product selectivity; when the catalyst catalyzes carbon dioxide to have copolymerization reaction with epoxides, the carbonic ester unit content of the copolymerization product is high, the cyclic carbonate content of the copolymerization product is low, and the catalyst is high in actual application value and promising in market prospect.
Owner:YANCHENG INST OF TECH
Carbon dioxide based high polymer material with crystallization performance
InactiveCN102786677BHigh unit contentNarrow molecular weight distributionPolymer scienceAqueous sodium hydroxide
The invention belongs to the field of the high polymer material, which relates to a class of carbon dioxide based high polymer material with the crystallization performance. The carbon dioxide based high polymer material with the crystallization performance is characterized in that end position alkyleneoxide containing an electrophilic group and carbon dioxide are copolymerized to form crystallizable polycarbonate material with an identical height structure under the action of catalyst. The polycarbonate has the following characteristics that the content of a carbonate ester unit in a polymer chain is 90-100%, and the identical structure of the polymer is between 80.0% and 99.9%; after the polymer is hydrolyzed by sodium hydroxide aqueous solution, the enantiomer selectivity of glycol obtained by measurement is 80.0% and 99.9%; and the polycarbonate with the crystallization performance can be obtained through carrying out simple thermal treatment on the polymer. The polycarbonate material provided by the invention has the advantages of big possibility of crystallizing, strong thermal deformation resistance and the like.
Owner:DALIAN UNIV OF TECH
A method for preparing zeaxanthin crystals from marigold oleoresin without waste water
In an existing preparation of zeaxanthin crystals, a large amount of alkaline colored waste water is produced in a washing and purification stage, the cost of environmental treatment is high, and environmental pollution is caused by emissions. The invention discloses a production process of finally preparing zeaxanthin crystals from marigold oil resin without waste water through a series of processes. The preparation method of the zeaxanthin crystals from the marigold oil resin without waste water is characterized in that the preparation method includes the steps of taking the marigold oil resin as raw material to be heated to a certain temperature in anhydrous or slightly watery conditions so that lutein esters are saponified in alcoholic solution of alkali and finally isomerized to zeaxanthin, using low-boiling anhydrous or low water content alcohol to wash saponification mixture, and recovering most alcohol solvent through vacuum distillation after the collection of the lotion; thesolvent can be reusable, remaining solid dry matter can be used directly as feed additives, and the cleanly-wasted zeaxanthin crystals can be used as food additives raw material without recrystallization.
Owner:GUANGZHOU LEADER BIO TECH
A preparation method of Chinese herbal tea for preventing and alleviating urinary tract infection
ActiveCN108079080BInfection curative effect is clearPalliative propertiesDispersion deliveryAntiinfectivesUpper urinary tract infectionFlos chrysanthemi
Owner:杨福红
Burning device capable of saving fuel and reducing pollution
InactiveCN100570217CEfficient use ofEmission reductionNon-combustible gases/liquids supplyCombustion regulationCombustion chamberCombustor
The invention relates to a combustion device which can improve the combustion efficiency of a burner, save fuel and reduce environmental pollution. The manufacturing device communicates with the combustion-supporting gas homogeneous mixer to form a combustion-supporting gas conveyor, and the output end of the homogeneous mixer is delivered to the combustion chamber through a gas-air mixing buffer. During work, while sending air into the combustion chamber of the burner, the combustion-supporting gas is sent into the combustion chamber of the burner through the combustion-supporting gas conveyor. By increasing the volume of the combustion-supporting gas and reducing the volume of air entering the combustion chamber, the fuel can be consumed Complete combustion, improve combustion efficiency, reduce NOX and CO emissions.
Owner:吴军杰
A kind of industrial production method of crude glycyrrhizic acid
ActiveCN106279345BHigh unit contentConserve waterSugar derivativesSteroidsWater resourcesFilter material
The invention discloses an industrial production method of rough glycyrrhizic acid. The industrial production method comprises the following steps: drawing liquorice roots into shreds or powder through a drawing machine; extracting by taking hot water as an extracting solvent to obtain an extracting solution; cooling extracted material liquid; after finishing cooling, centrifuging to obtain clarified material liquid; carrying out acid regulation on the centrifuged material liquid in an acid tank; after finishing the acid regulation, standing and carrying out acid precipitation for 2h to 5h; filtering material liquid subjected to the acid precipitation; washing a filtered solid with water to obtain a wet product; drying the wet product to obtain a rough glycyrrhizic acid product. By adopting hot water countercurrent circular extraction and combining a cooling and impurity removing process, a water resource is saved and the extraction rate of the product is guaranteed; a post-period purification process is simple and easy to operate and the unit content of the obtained rough glycyrrhizic acid product is more than or equal to 45 percent; industrial production is easy to realize.
Owner:CHENGUANG BIOTECH GRP CO LTD
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