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.

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 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 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 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 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.