7results about How to "Avoid heavy use" patented technology

The invention discloses a method for synergistically preparing magnesium ammonium phosphate by treating ammonia-nitrogen wastewater with phosphate tailings, which comprises the following steps: roasting the phosphate tailings at high temperature to obtain roasted ore; the obtained roasted ore is subjected to digestion treatment, CO2 is introduced into ore pulp for carbonization, and the CO2 comes from roasting waste gas CO2 and carbon-containing flue gas; performing solid-liquid separation to obtain a first filtrate and a first filter residue, using the first filter residue to recover calcium, and using the first filtrate to treat ammonia-nitrogen wastewater; adding a phosphorus source and ammonia-nitrogen wastewater into the first filtrate, adjusting the pH value, and filtering after reaction to obtain a second filtrate and a second filter residue; the ammonia nitrogen content of the second filtrate is detected through Nessler's reagent spectrophotometry, and the ammonia nitrogen removal standard is met; and drying the second filter residue at low temperature to obtain a magnesium ammonium phosphate product. The method is low in production cost, high in product value and high in resource utilization rate, ammonia nitrogen in the wastewater can be efficiently removed, the environmental wastewater discharge standard is met, efficient value-added utilization of industrial by-products is achieved, and meanwhile the prepared magnesium ammonium phosphate product meets the industrial standard.

The application discloses a kind of sheet bismuth-based metal organic framework materials and preparation method thereof, comprising the following steps: bismuth salt and polybasic acid organic ligand are mixed, then mixed with grinding ball, ball milling treatment, obtain bismuth-based metal organic framework material.The application prepares bismuth-based metal organic framework material with sheet morphology structure by mechanical ball milling method, by using mechanical energy in ball mill to crush reactant, promote the rapid progress of bismuth metal ion and organic ligand reaction, the whole reaction process does not need solvent, or only needs trace amount of solvent, avoid the large use of organic solvent.The application can directly promote reaction at room temperature by mechanical force, and reaction time is short, yield is high, energy consumption is low, green and environmental protection.The bismuth-based metal organic framework material has unique sheet morphology structure, high specific surface area and high structural stability and the like characteristics, and size can be controlled, can be widely used in carbon dioxide adsorption reduction, adsorption of pollutants in water and the like fields.

The application discloses PET matte master batches, a preparation method and application thereof, and belongs to the field of functional material modification. Barium sulfate is used as an extinction agent, the volume density of the barium sulfate is large, the barium sulfate can be well mixed with resin, the problem of layered mixing is solved, the color of the barium sulfate itself is white, and the color of the master batch is not affected. Moreover, the barium sulfate is compounded with organic modified layered silicate to produce a synergistic effect, the light transmittance is effectively improved, a high light transmittance, high haze and high gloss film product is successfully prepared, and the film product can be applied to high-end industries.

The invention discloses an electrochemical catalytic synthesis method of a macrolide compound, and belongs to the field of electrochemical catalytic synthesis. According to the method, triphenylphosphine is taken as a deoxidizing reagent, halide ions are taken as an electrocatalyst, a graphite flake is taken as an anode, foamed nickel is taken as a cathode, in the presence of additives DBU and the like, omega-hydroxycarboxylic acid shown in a structure I is subjected to constant-current electrolysis in a single-chamber electrolytic bath, and the lactone compound shown in a structure II is prepared in one step. The method is characterized in that the concentration of the active reaction intermediate is regulated and controlled by controlling the current density, so that a high dilution condition which must be adopted in a conventional method is avoided, and the synthesis of the macrolide compound under a high concentration condition is realized. The method can be carried out at the concentration up to 250 mM, complex slow dropwise adding operation is not needed, use of a large amount of solvent is avoided, and meanwhile the final product can be obtained only through one-step reaction. Compared with different methods under the same concentration, the method provided by the invention has more advantages. .

The application relates to a continuous solvent-free reaction synthesis method of cycloxazidone, and belongs to the technical field of organic synthesis. The method comprises the following steps: taking ethyl chloroformate and monocyane as raw materials to generate N-cyano ethyl carbamate; dimethyl sulfate is added to generate N-cyano-N-methyl ethyl carbamate; dimethylamine hydrochloride aqueous solution is added to generate ethyl N-methyl-N-(N', N'-dimethylformamidino) carbamate; cyclohexyl isocyanate is added to generate ethyl N-methyl-N-[(cyclohexyl carbamoyl) (dimethylamino) methylene] carbamate; and the ethyl N-methyl-N-[(cyclohexyl carbamoyl) (dimethylamino) methylene] carbamate is subjected to a cyclization reaction to generate cycloxazidone. The method avoids the large use of toxic and harmful solvents such as chloroform, and the wastewater after the reaction basically does not contain dimethylamine, and the COD and total nitrogen content are greatly reduced.

This invention belongs to the field of ultraviolet absorber technology, specifically relating to an ultraviolet absorber UV-323 and its preparation method. The preparation method includes the following steps: (1) diazotization reaction, (2) coupling reaction, (3) sulfide dispersion reduction, (4) esterification reaction, and (5) crystallization. The purity of the product of this invention is significantly improved. Through optimized process route and solvent recovery-recrystallization purification, the purity of the product can reach over 99%, and the appearance is a white powder, meeting the quality requirements of high-end application fields. The overall reaction yield of this invention is significantly improved. Through optimization of diazotization temperature control, improvement of coupling solvent system, selective reduction of sulfides, and precise control of esterification conditions, the yield of each step is effectively guaranteed, providing an economical and feasible technical solution for industrial-scale production.

The application provides a method for preparing fish skin collagen peptides with high antioxidant activity by DHPM and UIO-66 molecular imprinting, and relates to the technical fields of aquatic product deep processing and bioactive peptides. The method comprises the following steps: fish skin pretreatment, DHPM-induced collagen protein unfolding, endogenous enzyme autolysis, crude separation, selective target enrichment by using UIO-66 material with histidine as a molecular imprinting template, and drying collection. The application destroys the dense triple helix structure of collagen protein by using the physical field effect of dynamic high pressure microfluidization, exposes the enzyme cutting site, uses the endogenous enzyme of fish skin for autolysis, and then uses the histidine molecular imprinting UIO-66 material to accurately capture the high antioxidant activity peptide segment, so that the enzymolysis efficiency and the antioxidant activity of the product are significantly improved. The application does not need to add exogenous enzymes, and has the advantages of green process, low cost and high product purity. The obtained fish skin collagen peptides can be widely applied to the fields of functional food, cosmetics and medicine.