39results about How to "No by-products" patented technology

The invention relates to a method for synthesizing cyclohexanone-oxime and caprolactam, particularly a method for synthesizing cyclohexanone-oxime and caprolactam by performing catalytic hydrogenation on nitrocyclohexane used as a raw gas phase. The method has the advantages of high controllability, low cost, environmental protection, higher conversion ratio of raw materials and higher yield, and has industrialization application prospects. The reaction process is simple, no coproduct ammonium sulfate is generated in the reaction process, and no wastewater or waste gas is generated to pollute the environment, and thus, the method is an environment-friendly production technique.

The invention discloses a combined catalyst for improving denitration performance and an application thereof, which belongs to the field of catalysts. In the catalyst, industrial anatase crystal form TiO2 is taken as a carrier; V2O5-WO3/TiO2 is put at the front section of MnOx-CeO2/TiO2, and is called front section; MnOx-CeO2/TiO2 is called back section; the front section refers to a section where an air current main body is contacted firstly; the back section refers to a section where the air current main body is contacted secondly; the mass ratio of the front section to the back section is 1:1-1:3; V2O5 accounts for 2-4 percent of the mass of the carrier TiO2; WO3 accounts for 8-10 percent of the mass of the carrier TiO2; Mn accounts for 10-20 percent of the mass of the carrier TiO2; CeO2 accounts for 8-10 percent of the mass of the carrier TiO2; and MnOx is taken as the general name of MnO2 and Mn2O3. The combined catalyst can be applied to an integral catalyst for industrial application. The combined catalyst has a wider active temperature window; particularly, the removing efficiency of NOx by NH3-SCR is greatly increased under the exhaust low-temperature wording condition of a diesel engine; and moreover, the same NOx removing efficiency as the conventional catalyst can be obtained at a medium-high temperature section.

There is a method of preparing the controlled molecular weight, water-soluble shell glycan, which fully dissolve all kinds of non-acetyl shell glycans into the hydrochloric acid, then slowly add the oxidant-sodium hypochlorite-hydrogen peroxide to the solution, then make them react under the room temperature to break away the 1,4-beta-D-indican bond, and produce the low molecular weight, water-soluble shell glycan. The invention's process is simple, and the prepared low molecular weight, water-soluble shell glycan had good water solubility and retains the main-chain structure of the shell glycan, and can be used as not only the materials of oral medicines and health products, but also the additive of the cosmetics and the food trades.

The invention discloses an anti-aging composition comprising NADH and ceramide, a skincare product as well as a preparation method and application thereof, which relates to the field of skincare products. The composition comprises the following main components: 1 to 100 parts by weight of NADH, and 1 to 50 parts by weight of ceramide. All components of the anti-aging composition comprising the NADH and ceramide have a synergistic effect, so that an effect for resisting the aging free radicals can be comprehensively realized in various aspects. The skincare product adopting the anti-aging composition is simple in preparation process, free from byproducts, safe, effective and low in production cost.

The invention specifically relates to a fused aza-heterocyclic aromatic hydrocarbon porous framework of a two-dimensional lamellar structure, and a preparation method and application thereof, belonging to the technical field of functional materials. According to the invention, aza-heteropolycyclic aromatic hydrocarbon is synthesized on the basiss of cyclization of a diamino group and a diketo group for formation of phenazine and is used as a monomer; and then aza-heteropolycyclic aromatic hydrocarbon is subjected to the Scholl reaction under the catalysis of a Lewis acid salt so as to allow aza-heteropolycyclic aromatic hydrocarbon to undergo homopolymerization at high temperature and low pressure, so a conjugated polymer material of a microporous structure and with two-dimensional lamellar layers for complex catalysis of metal is produced. The two-dimensional material has the characteristics of a high specific surface area, a full conjugate plane structure, heat stability, resistance to acid and alkali, excellent catalytic activity, high recovery rate, etc. The method provided by the invention is simple to operate and controllable in process; and the prepared material can be used for catalyzing a cycloaddition reaction of CO2 with epoxypropane compounds so as to immobilize CO2 and has good application prospects.

The modified silver-carrying zirconium phosphate powder is prepared through the process of mixing silver-carrying zirconium phosphate powder with crystallization promoter in the amount of 3-20 wt% of the zirconium phosphate powder, and roasting at 800-1100 deg.c inside atmosphere with oxygen content over 5 vol% for 1-5 hr. The crystallization promoter is mixture of MgO or ZnO or compound capable of producing MgO or ZnO in roasting and B2O3 or compound capable of producing B2O3 in roasting with molar ratio of B2O3 to MgO or ZnO 0-0.3. The modified silver-carrying zirconium phosphate powder may be maintained in the air for long time and has no color change during mixing with resin.

The invention provides a preparation method of a buffalo milk fat natural flavoring base material, and belongs to the technical field of food processing. The preparation method comprises the following steps of using raw buffalo milk or buffalo milk fat obtained through degreasing the raw buffalo milk as an enzymolysis substrate, performing pasteurization, and performing enzymolysis sequentially through flavored protease and lipase so as to obtain uniform semi-solid buffalo milk fat natural flavoring base material. The preparation method is simple in operating sequences and uniform in reaction systems; the product namely the flavoring base material is rich and full in flavor, rich in micromolecular peptide, amino acids and fatty acid, free from bad flavor of bitter taste and the like, and stable in quality; and the flavoring base material can be wholly applied, can also be used in a manner that after the flavoring base material is centrifuged, milk fat phases are taken to be independently used, and the flavoring base material is widely applied, and is suitable for dairy products and other various healthy foods of which the milk fragrance flavor needs to be improved.

The invention discloses a method for producing dodecanoic lactam. The method comprises the following steps: carrying out an oximation reaction in the presence of a solvent a by taking cyclododecanoneand Raschig liquid as raw materials; performing pressure distillation on an oil phase obtained by liquid separation to remove and recover the solvent, dissolving the obtained cyclododecone oxime in amolten state with a solvent b, carrying out a Beckmann rearrangement reaction under catalysis of a rare-earth metal modified magnetic solid super-acid catalyst c, and refining, thereby obtaining the product dodecanoic lactam.

The invention relates to a dicarboxylic hydrogen salt ionic liquid with an asymmetric chemical structure and a weak acidity. The cation of the ionic liquid is a tetraalkyl quaternary ammonium cation with the asymmetric structure or an N,N-dialkylimidazole cation with the asymmetric structure, and the anion is a dicarboxylic hydrogen radical anion. The ionic liquid of the invention, which has a low viscosity and a low melting point, can truly meet industrial application requirements. According to the invention, chlorinated tetraalkyl quaternary ammonium with the asymmetric structure or chlorinated N,N-dialkylimidazole with the asymmetric structure and potassium hydrogen dicarboxylate are adopted as raw materials, the target ionic liquid is obtained through one-step synthesis by adopting a microwave process, and the ionic liquid which has the advantages of simple preparation process, high product yield and purity, no byproduct, and low synthetic cost is very suitable for the industrialized production. The dicarboxylic hydrogen salt ionic liquid with the asymmetric chemical structure and the weak acidity of the invention can be used to rapidly and efficiently absorb SO2. The invention discloses a preparation method of the ionic liquid.

The invention belongs to the field of light stabilizers and preparation thereof, and particularly relates to a high-molecular-weight low-alkalinity light stabilizer and preparation and application thereof. The structure of the light stabilizer is shown as a compound I. The light stabilizer has high molecular weight, good extraction resistance, narrow molecular weight distribution and excellent light stability, volatilization and migration in the using process can be effectively prevented, the molecular weight is about 2000-10000, and the molecular weight distribution is below 2.0. The preparation method of the light stabilizer is simple, mild in synthesis condition, easy to operate, high in product yield, free of by-products, clean and environmentally friendly.

The invention provides a polyether modified organosilicon polymer and a preparation method and application thereof. The preparation method of the polyether modified organosilicon polymer comprises the following steps of: S1, carrying out hydrosilylation chain extension reaction on double-end allyl terminated polypropylene glycol and a double-end hydrogen-containing silane compound under the action of a first Pt catalyst to obtain macromolecular double-end allyl terminated polypropylene glycol ether; and S2, carrying out hydrosilylation reaction on the macromolecular double-end allyl terminated polypropylene glycol ether obtained in the step S1 and trimethoxy hydrogen-containing silane under the action of a second Pt catalyst to obtain the polyether modified organosilicon polymer. The polyether modified organosilicon polymer provided by the invention is prepared by adopting two-step hydrosilylation reaction in a specific sequence, and is mild in condition, high in yield, free of byproducts, economical and environment-friendly.

The invention discloses a preparation method of fluorine resin, comprising the following steps of: mixing 33-62 parts by weight of perfluoroalkyl iodide and 0.3-0.8 parts by weight of initiator, and then heating to 60-100 DEG C, wherein the initiator is benzoyl peroxide or azobisisobutyronitrile; dropping 7-14 parts by weight of olefin, wherein the olefin is one or two of styrene, octylene, pinene and limonene; reacting at 60-100 DEG C for 3-5 hours; then adding 75-100 parts by weight of solvent, 28-33 parts by weight of acetic acid and 65-70 parts by weight of zinc powder, wherein the solvent is isopropanol or xylene; reacting at 60-100 DEG C for 3-5 hours to obtain a product; and filtering, water-washing, dehydrating and separating the product to obtain a target product. A continuous adding manner is adopted in the method, the reaction is easy to control, no byproduct is generated, the obtained product is easy to separate, and has high selectivity, low frictional factor (0.05-0.1), a water repellence angle of over 110 DEG and high oil repellency up to the first grade, does not freeze at 35 DEG C below zero, and does not decompose at 350 DEG C; and the fluorine resin can be used in the fields such as deep-sea drilling, ignitable ice exploiting, astronautical technology, equipment lubrication under the working condition of permanent freezing layers, and the like.

The invention relates to a recycling method of a waste lithium iron phosphate positive electrode material. The method comprises the following steps: adding phosphate into the waste lithium iron phosphate positive electrode material, then carrying out supercritical carbon dioxide extraction, and filtering to obtain a solid intermediate A; heating the solid intermediate A to obtain a solid intermediate B; and adding a polymer containing a benzene ring into the solid intermediate B, and calcining to obtain regenerated lithium iron phosphate. The method is simple in process, low in environmental pressure, low in manufacturing cost, good in atom economy, controllable in quality and easy to industrialize, and the final product is good in performance.

The invention relates to the field of arginine ketoglutaric acid preparation processes, in particular to a method for preparing arginine ketoglutaric acid by a spraying method. The method comprises the following steps: 1, starting up for inspection; 2, draining water from the system; 3, air supply testing; 4, adjusting the temperature; 5, adjusting the pressure; 6, spray testing; 7, high-pressurefeeding; 8, detecting the temperature; 9, dehumidifying and refluxing; and 10, centralized material collection. The beneficial effects are that: production is carried out by adding a set pressure spraying mode, the production process is optimized, byproducts are avoided, the production yield is high, production pollution is avoided, all the used raw materials are fermented and produced by themselves, the product yield is high, the product quality is good, and compared with a traditional water reaction recrystallization method, a one-time spraying method is adopted in the production process forproduction, the production process is less in pollution, the yield is higher, and the product quality is greatly improved.

The invention relates to a preparation method of 3-nitrophthalic anhydride. The method includes the following steps: placing 3-nitrophthalic acid in a reaction solvent, adding a catalyst, and heatingfor reaction; and removing the reaction solvent and the catalyst from an obtained substance under negative pressure to obtain the 3-nitrophthalic anhydride. In the preparation method, the 3-nitrophthalic acid raw material can be easily obtained, the 3-nitrophthalic anhydride is synthesized by direct catalytic dehydration in one step, and the preparation method has the advantages of simple process,low cost, high yield and no by-products.

The invention discloses a method for recovering triethylamine hydrochloride from glyphosate reaction liquid produced by a glycine process. The method comprises the following steps: S1, removing waterand hydrochloric acid from the glyphosate reaction liquid to obtain a solid mixture; S2, adding a solvent into the solid mixture, conducting heating, and carrying out phase transfer to obtain a solvent phase, wherein a solid phase is also obtained in the step and is used for synthesizing glyphosate; S3, cooling the solvent phase to obtain a crude triethylamine hydrochloride product; and S4, centrifuging the obtained crude triethylamine hydrochloride product, and carrying out spray drying to obtain a finished triethylamine hydrochloride product. According to the invention, on the premise of ensuring the content of triethylamine hydrochloride in the finished triethylamine hydrochloride product, the yield of triethylamine hydrochloride is increased.