473results about How to "In line with the concept of green chemistry" patented technology

The invention belongs to the technical field of natural polymer modification and discloses a preparation method of a starch and fatty acid compound. The method comprises the following steps: adding de-ionized water into starch and balancing moisture in a closed container; carrying out heat treatment to obtain the starch subjected to wet and hot treatment; then adding a buffering solution to prepare a starch solution; after pre-heating, adding 2 to 5u/g pullulanase liquid to react for 4 to 5 hours; after carrying out enzyme deactivation, centrifuging and separating to obtain enzyme treatment modified starch; then stirring and gelatinizing the starch in a boiled water bath for 25 to 45 minutes and cooling to 60 to 90 DEG C to obtain gelatinized starch; then transferring the gelatinized starch into a homogenizing machine and adding fatty acid to carry out homogenization and mixing; and keeping the heat of the water bath to synthesize for 30 to 40 minutes to obtain the starch and fatty acid compound. According to the preparation method, a greener and more environment-friendly new way is provided for synthesizing the starch and fatty acid compound through wet and hot treatment and controlled enzymolysis treatment by adopting a gelatinizing method.

The invention discloses carbon aerogel prepared from superfine nano aerogel obtained through TEMPO (2,2,6,6-tetramethylpiperidinooxy) oxidation. The superfine nano aerogel is prepared with a TEMPO oxidation method, then, preoxidation at the high temperature is performed, and the carbon aerogel is prepared with a carbonization method under the inert gas shielding condition. Used TEMPO is an environment-friendly solvent and has high safety, and therefore, the prepared carbon aerogel cannot have toxicity and cannot corrode instrument equipment or pollute the environment. TEMPO as an oxidizing agent can be recycled, and the condition of environment pollution caused by metal ions serving as a catalyst can be avoided.

The invention discloses a nano silver-polyvinylidene fluoride composite separation membrane and a preparation method thereof. The separation membrane is obtained by modifying a polyvinylidene fluoride membrane with nano silver. According to the invention, two dispersion methods namely a physical method and a chemical method are simultaneously adopted in the preparation process, so that nano particle reaches an ideal dispersion effect in the polyvinylidene fluoride separation membrane and a reliable guarantee is provided for the excellent property of the membrane. In the invention, a noble metal nano silver the price of which is relatively low is added, and the amount of nano silver is regulated, so that the mechanical property, antibiotic property and pollution resistance of the polyvinylidene fluoride separation membrane are greatly improved, the water flux and trapping rate of the polyvinylidene fluoride separation membrane are also improved, the service life of the membrane is prolonged, and the membrane has high performance-to-price ratio.

The invention discloses a method for preparing a manganese dioxide nanosheet coated carbon/sulphur (MnO2@C/S) compound. The method comprises the following steps: firstly heating and melting a carbon material and sulphur simple substance to obtain a carbon/sulphur compound, then adding permanganate solution into aqueous phase dispersion liquid of the carbon/sulphur compound, heating, stirring, reacting, then carrying out solid-liquid separation, washing, and drying, so that the manganese dioxide nanosheet coated carbon/sulphur compound is obtained. Besides, the invention also discloses the manganese dioxide nanosheet coated carbon/sulphur compound obtained by adopting the method and application thereof. When the manganese dioxide nanosheet coated carbon/sulphur compound is applied to a lithium sulphur battery cathode material, and initial discharge capacity, cycle performance and rate capability of the obtained battery are respectively greatly improved.

The invention discloses a porous carbon material for an alkali lignin-based supercapacitor as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing alkali lignin coarsely purified from papermaking black liquid with a three-block polymer Pluronic Fl 27 and Mg(CH3COO)2.4H2O, and adding formaldehyde and hydrochloric acid for full and uniform stirring to obtain a mixed solution; placing the mixed solution into a drying oven for drying, so as to obtain a black brown solid; then putting the black brown solid into a tubular furnace for carbonization reaction, continuously feeding nitrogen or inert gas at the end of the reaction, and cooling to a room temperature; finally carrying out acid pickling, washing and drying to obtain the black powdered porous carbon material. The obtained material can be applied to a double-electrode-layer supercapacitor; in the carbonization process, no strong-causticity chemical substances such as strong acid and strong alkali are used, so that the loss of equipment is reduced to the maximum extent; the used raw materials are by-products in the pulp and paper making industry, so that the maximum use of resources is realized; moreover, lignin is wide in source and low in cost, so that the production cost is reduced.

The invention discloses a preparation method of a modified nano calcium borate lubricant additive, which comprises the following steps of: a) weighing boric acid and calcium oxide, adding water respectively to prepare a boric acid aqueous solution and lime milk emulsion, b) stirring and mixing the boric acid aqueous solution and the lime milk emulsion, adding a surfactant, after heating for reaction, performing suction filtration, drying and grinding to obtain nano CaB6O10 powder, c) adding water to the nano CaB6O10 powder, then adding oleic acid, performing ultrasonic stirring, standing to separate an oil phase from a water phase, taking an upper oil phase, drying, and obtaining the oleic acid modified nano CaB6O10 lubricant additive. The additive prepared by the method is high in boron-calcium ratio, and small in particle size, and particle are distributed uniformly (10-15nm). According to the method, a washing technology is removed, and the whole production process from raw materials to the product is environment-friendly and non-pollution, and accords with a green chemical concept.

The invention discloses a reinforcing method utilizing waterlogged wood relics of nanocellulose. The reinforcing method comprises the following steps of: mixing nanocellulose with a filling agent to obtain a reinforcing agent; and performing dehydrating and desalination on the waterlogged wood relics, and adding the waterlogged wood relics into the reinforcing agent to soak, and performing drying for reinforcing. The waterlogged wood relics obtained by treatment of the reinforcing method are bright in color, are good in stability, do not easily separate out salts, and are especially free of secondary acid degradation. The reinforcing method disclosed by the invention can be used for effectively clearing and protecting the reinforcing method, the dried and reinforced wood is stabilized to a pH neutral state, acid corrosion and salt separation are effectively restrained, and mechanical strength of highly rotten wood is greatly reinforced.

The invention discloses a preparation and application of a graphene based metal compound nano array material, and belongs to the technical field of preparation of functional nano materials. A carbon precursor and a metal salt mixture are ground and then coat a foam nickel substrate, the coated foam nickel substrate is subjected to heat treatment in an inert atmosphere, and a graphene array material is obtained by washing. The graphene based metal compound nano array material is obtained from the graphene array material by solution growth or electrochemical deposition and calcination and other ways. The nano array material prepared by the method has high electric conductivity, fast ion transfer channels, high active sites and other physical properties, and shows electricity storage performance of long service life and high capacity and excellent electrochemical catalytic activity and stability in energy storage and conversion and electrochemical catalysis reactions. The whole material preparation process is simple, no toxic products are generated in the reaction, and the preparation method has the advantages of low energy consumption, and green and environmental protection, and is suitable for large-scale industrial production.

The invention discloses large-scale preparation and lithium battery application of vanadium pentoxide and carbon nano composite thereof, and belongs to the technical field of functional nano material preparation. The preparation method comprises the following steps: dissolving vanadium pentoxide solid powder in pure water, mixing with hydrogen peroxide, obtaining a scarlet solution, and preserving the temperature of the solution for a period of time to become a colloidal sol; carrying out freeze drying treatment on the colloidal sol to obtain a three-dimensional self-supporting solid; and taking partial solid to be calcinated under nitrogen atmosphere so as to obtain a vanadium pentoxide nano material. The corresponding solid is added into composite carbon nano tube and graphene as long as the scarlet solution is obtained, and the mixture is dispersed uniformly without changing remaining operation. The lithium battery positive electrode material prepared in the method is long in service life, high in capacity and stable in cycle performance. The whole technological process is simple, the price of raw materials is low, no toxic product is generated, the energy consumption is low, and the material is green and environmentally-friendly, so that the disadvantage that existing lithium battery materials are high in production cost, complex in process and great in byproduct toxicity is overcome, and the material is applicable to industrial large-scale production.

The invention relates to a method for preparing psoralen and isopsoralen or an extract containing psoralen and isopsoralen. Particularly the method comprises the steps of (i) conducting backflow extraction on fructus psoraleae medicinal materials by using water, and concentrating a combined extracting solution to obtain a concentrated solution; (ii) adding acid in the obtained concentrated solution, heating and hydrolyzing; (iii) eluting hydrolysate on a macroporous adsorption resin by using water to remove impurities, eluting by using ethanol water solution with concentration larger than 50%, collecting an ethanol eluant, and concentrating or optionally drying further to obtain the extract containing psoralen and isopsoralen; and (iv) optionally subjecting the extract obtained in the step (iii) to a silicagel column, eluting by using an organic solvent, collecting psoralen fraction and isopsoralen fraction, and removing the solvent to respectively obtain psoralen and isopsoralen. The method is simple in operation, short in production period, high in yield, less in pollution and applicable to industrialization mass production.

The invention provides a composite fungicide and metal cutting fluid with the same and a preparation method of the composite fungicide. The composite fungicide comprises 1,2-benzisothiazole-3-ketone, epsilon-polylysine and water-soluble organic amino. In the composite fungicide provided by the invention, the three components, namely the 1,2-benzisothiazole-3-ketone, the epsilon-polylysine and the water-soluble organic amino are synergistic, so that the sterilization effect of the composite fungicide is improved; and the metal cutting fluid with the composite fungicide is good in sterilization effect, remarkable in biological stability, high in security and wide in application prospect, meets on-site process requirements such as lubrication, cooling, emulsion stability and corrosion resistance, and meets ideas of green chemicals.

The invention relates to the technical field of indoor air purification and discloses an adsorbent with adsorption and oxidation synergistic effects on indoor toluene, and the loading capacity of potassium permanganate on an H-ZSM-5 molecular sieve is 0.05 to 1.The adsorbent has good oxidation performance and excellent absorption effect, toluene can be directly oxidized into benzoic acid, and the technical problem of vacant adsorption of indoor low-concentration toluene is solved. The invention further discloses a preparation method of the adsorbent with the adsorption and oxidation synergistic effects on the indoor toluene, H-ZSM-5 is used as an adsorption carrier, potassium permanganate is loaded on the adsorption carrier by virtue of dipping, and then drying is performed by a nitrogen blowing instrument. The preparation method has the advantages of simplicity, short consumed time and low cost, conforms to the concept of green chemistry and has a wide application prospect. The invention further relates to application of the adsorbent to indoor toluene treatment. An effective method is provided for indoor pollution gas treatment, and an important application value is realized in the aspect of life safety.

The invention discloses a porous polymer adsorption material containing triazine ring and azo bond functional groups, and a porous polymer catalysis material, and preparation methods and applicationsthereof. 2,4,6-tris(4'-aminophenyl)-1,3,5-triazine and diphenol and/or trisphenol, which are used as raw materials, undergo diazo coupling polymerization cross-linking to obtain the porous polymer adsorption material. The porous polymer adsorption material has the charateristics of high specific surface area, high nitrogen element content, high micro-pore proportion, good affinity to carbon dioxide and good adsorption performance, and a metal ion supported porous polymer adsorption material obtained after loading metal ions on the porous polymer adsorption material has the advantages of mild reaction conditions, short reaction time, realization of the yield reaching 95% or above, and no obvious reduction of the yield using the recycled catalyst when used to catalyze a reaction of carbon dioxide and epoxypropane for generating propylene carbonate, and is expected to be used in actual industrial production.

The invention discloses a preparation method of L-methyldopa. The key points of the method are as follows: veratone is recycled from the L-methyldopa production waste liquor, the mother liquor synthesized from DL-aminopropionitrile or the racemic mother liquor of D-aminopropionitrile is mixed with an organic solvent, the mixture is heated to 40-110 DEG C to react for 1-24 hours, and the obtained solution is stood and layered after the reaction to obtain a water layer and an organic layer; the organic solvent is a non-solvent of water and a good solvent of veratone; or alkali and water are added in the splitting waste liquor of DL-aminopropionitrile, the pH is adjusted to 7-14, the solution is heated to 40-110 DEG C to react for 1-24 hours, and the obtained solution is stood and layered after the reaction to obtain a water layer and an organic layer; and the solvent is recycled from the obtained organic layer, and high vacuum distillation is performed under the condition that the pressure is no more than 5kPa to obtain veratone for reuse. By adopting the preparation method of L-methyldopa, the main raw material veratone can be recycled from the L-methyldopa production waste liquor, the chemical oxygen demand (COD) of wastewater can be reduced and the concept of green chemistry can be realized.

The invention provides a preparation method for a super-hydrophilic/underwater super-oleophobic polyvinylidene fluoride composite membrane, belonging to the field of preparation technologies of environmental functional materials. The preparation method comprises the following concrete steps: preparing a PVDF membrane and a PVDF@PDA membrane at first; dissolving nickel nitrate hexahydrate, cobalt nitrate hexahydrate and urea in deionized water to obtain a mixed solution, pouring the mixed solution into ethanol, adding the PVDF@PDA membrane and carrying out soaking; and then placing the PVDF@PDAmembrane in a reaction vessel for a reaction, cleaning the membrane by using deionized water and ethanol and then carrying out drying so as to prepare the PVDF@PDA@NiCo2(OH)6 composite membrane. According to the invention, membrane separation technology is adopted; process flow is short; operation is easy to control; resources are saved; no secondary pollution is produced; and the preparation comforms to the concept of green chemistry and is suitable for wide promotion and application.

The invention belongs to the field of environmental water pollution abatement, and discloses a ZnIn2S4 nanosheet coated beta-Bi2O3 core-shell heterogeneous compound photocatalyst, as well as a preparation method and application thereof. According to the method, the ZnIn2S4 nanosheet coated beta-Bi2O3 core-shell heterogeneous compound photocatalyst is prepared by using ZnIn2S4 and synthetic beta-Bi2O3 monomer as raw materials through a simple self-aggregation effect. The binary ZnIn2S4/beta-Bi2O3 compound nano-photocatalyst can be applied to catalytic degradation of tetracycline hydrochloride and methyl orange under visible light, shows excellent photo-induced electron separation efficiency, and can be used for improving the visible light utilization and integral photocatalytic activity. The ZnIn2S4 nanosheet coated beta-Bi2O3 core-shell heterogeneous compound photocatalyst is prepared from nontoxic raw materials, has simple operation and mild reaction condition, accords with the concept of environment-friendly chemistry, and has a wide application prospect in the aspect of solving water environmental pollution.

The invention discloses a carbon dioxide and water processing methane catalyst and a preparation method and application thereof, and belongs to the technical field of chemical engineering. The catalyst is mainly prepared from metal simple substances and a supported nickel-based catalyst. The metal simple substances include Zn, Fe, Al, Mn, Ni, Co and Mg; the nickel-based catalyst is Ni/C, wherein Cis a carrier including Al2O3, SiO2, TiO2, ZrO2, CeO2 and La2O3. The total weight of the catalyst is adopted as the reference, the mass percent of the metal simple substances is 20-90%, and the mass percent of the nickel-based catalyst is 10-80%. According to the preparation process of the catalyst, dipping is adopted, sol-gel is adopted, a sediment or sedimentation method is adopted, and then drying, roasting and reducing are performed to obtain the catalyst. The reaction raw materials are carbon dioxide and water, sources are wide, the price is low, the catalyst preparation method is simple,easy to implement and low in cost, and the catalyst has the certain application prospect. The catalyst is mainly applied to thermo-catalysis instead of photo-catalysis or electro-catalysis.

The invention relates to an amino-protected 3-hydroxy adamantane glycine benzothiazole-2-thiol active ester as well as a preparation method and application thereof. The thiol active ester is prepared by virtue of reaction between amino-protected 3-hydroxy adamantane glycine and dibenzothiazyl disulfide. The invention further discloses application of the compound in the preparation of a saxagliptin intermediate and saxagliptin. The invention provides a brand new chemical structure. The preparation method is simple and low in cost; the compound is applicable to the preparation of saxagliptin, so that the preparation process can be effectively simplified; and the reaction is mild, and the compound has a wide generalization prospect.