37results about How to "Easy to complex" patented technology

The method for separating epoxycyclohexane and n-amyl alcohol from cyclohexanone by-product light oil includes: pre-distilling raw material light oil and dewatering, adding urea at normal temp., uniformly stirring them and filtering, and rectifying filtrate to obtain epoxycyclohexane; adding water into filter cake, heating to 50 deg.C, making oil-water separation, its oil phase is crude n-amyl alcohol, and rectifying the crude n-amyl alcohol to obtain high-purity n-amyl alcohol product whose purity is above 99% and its yield rate is greater than 95%. Said urea can be repeatedly used, its production cost is low.

The invention discloses an antibacterial coating, a preparation method and application thereof, and relates to the technical field of antibacterial coatings. The antibacterial coating of the present invention comprises the following components: chitosan, tannic acid, zinc nanoparticles, copper nanoparticles, tackifier and organic solvent; the mass ratio of chitosan to tannic acid is 50-95 : 5-50; based on the total mass of chitosan and tannic acid, the total mass fraction of the zinc nanoparticles and copper nanoparticles is 1-5%; the mass fraction of the tackifier is 0.5-3% ; The mass fraction of the organic solvent is 10-30%. The antibacterial coating of the present invention has good antibacterial performance, and at the same time, the coating has high stability and can be lasting antibacterial.

The invention provides a preparation method of Astragalus polysaccharide-iron. The method comprises the following steps: 1, extracting and purifying Astragalus polysaccharides; and 2, preparing Astragalus polysaccharide-iron: dissolving the purified Astragalus polysaccharides obtained in step 1, sodium tartrate and sodium carbonate in distilled water according to a weight ratio of 15:3:5, adding an iron salt solution with the weight 0.8-0.9 times the weight of the pure Astragalus polysaccharides to obtain a solution A, allowing the solution A to go through an exchange column loaded with basic ion exchange resin at a flow velocity of 3-8BV / h, reacting for 0.5-1h, cooling the obtained reaction product, filtering resin, flushing the surface of the resin with deionized water 3-5 times, carrying out alcohol precipitation with ethanol with the concentration of 75-85%, and drying the obtained precipitate at 50-70DEG C to obtain the Astragalus polysaccharide-iron. An ion exchange resin technology is adopted to catalyze preparation of a complex from Astragalus polysaccharide and iron, the method is novel, and the prepared Astragalus polysaccharide-iron has high purity and high content, has an iron supplementing function, and also has a piglet immunity enhancing effect.

The invention provides a silver powder of the silver paste of a crystalline silicon solar PERC battery and a preparation method thereof. The method comprises: respectively preparing silver salt solution, organic ligand solution and reducing agent solution, wherein the reducing agent solution contains ferrous sulfate; at least one group of solutions has an organic salt ionic liquid as a solvent. Add acid solution to the silver salt solution, and control its pH value to be 5~7; Then add the medium-strong reducing agent solution of preset molar ratio, stir and react preset time; Then press the molar ratio of ferrous sulfate and silver salt to be ( 1~2): 1, synchronously drop the organic ligand solution and the reducing agent solution into the silver salt solution, after the dropwise addition, stir and react for a preset time, then separate, wash and dry to obtain a crystalline silicon solar PERC battery Silver powder of silver paste. The invention can effectively adjust the silver salt reduction rate, and the obtained ferrous ion chelate can also be coated on the surface of the silver powder, so as to obtain highly dispersible silver powder and improve battery efficiency.

The invention relates to a hydroxy-pyridone ligand; a structural formula of the hydroxy-pyridone ligand is one of two formulas described in the description, wherein a structural formula of R is described in the description, R1 is hydrogen, alkyl of C2-C4, halogen, hydroxyl or carboxyl, m, n and p are independently selected from 1, 2 or 3, and r is 1 or 2. A preparation method of the hydroxy-pyridone ligand comprises the following steps: dissolving a compound as shown in a formula (1) into an organic solvent, and then enabling the obtained solution to react with an amino-terminated compound at the temperature of 25-35 DEG C in presence of a catalyst to obtain an intermediate compound; enabling the obtained intermediate compound to have a palladium-carbon reduction reaction in an organic solvent to obtain the hydroxy-pyridone ligand, wherein a structural formula of the compound as shown in the formula (1) is described in the description, and R1 is hydrogen, alkyl of C2-C4, halogen, hydroxyl, carboxyl or aryl. The invention also provides application of the hydroxy-pyridone ligand as chelating agents for lanthanide elements, actinide elements and / or heavy metal elements. The invention further provides application of the hydroxy-pyridone ligand as a chelating agent for the element in nuclear waste, wherein the element in the nuclear waste is Sr, Cs, Tc or I.

The invention discloses a method for transforming an existing hexavalent chromium plating solution into a new trivalent chromium plating solution and belongs to the technical field of electroplating. The method comprises the two steps that firstly, under the conditions that the pH value of the existing hexavalent chromium plating solution is 0.5-1.0 and the temperature is 80-90 DEG C, a specified amount of a reducing agent and a specified amount of the organic acid complexing agent are added, and heat preservation is conducted for two to four hours, so that hexavalent chromium is reduced to trivalent chromium and the trivalent chromium and an organic acid complexing agent form a trivalent chromium active ligand basic solution with the ligand structure being [CrLx.(H2O)6-x]; and secondly, the trivalent chromium active ligand basic solution is adjusted to become the new trivalent chromium plating solution by adding conducting salts and a catalyzer into the trivalent chromium active ligand basic solution formed in the first step. According to the method, the existing hexavalent chromium plating solution is effectively transformed into the environmental-friendly trivalent chromium plating solution, and the new trivalent chromium plating solution is high in electroplating speed under the standard condition; a chromium plated coating is good in brightness and uniformity, high in hardness and excellent in corrosion property, so that the chromium plated coating can be on a par with a chromium plated coating of the hexavalent chromium plating solution.

The invention belongs to the technical field of platinum-containing hydrosilylation catalyst synthesis and particularly relates to a silicon dioxide immobilized platinum-containing hydrosilylation catalyst and a preparation method and application.A functional organic ligand of the structure shown in the formula (I) is supported to surface hydroxylated silicon dioxide, and a novel ligand supported by silicon dioxide is obtained; then, complex platinum is removed by means of the novel ligand supported by silicon dioxide, and the silicon dioxide immobilized platinum-containing hydrosilylation catalyst is obtained.The catalyst is a metal organic complex catalyst supported by silicon dioxide with the hydroxylated surface and belongs to heterogeneous catalysts.The catalyst is mainly applied to hydrosilylation reaction, has high catalytic activity, and is easy to separate, capable of being repeatedly used and low in cost.The formula (I) is as shown in the description.

The invention discloses a restoration method for removing iron pollution of an anion exchange resin and a restoration drug formula, which can be used for solving the problem that the environment is polluted and an anion exchange resin tank is corroded because the use of sodium sulfite and concentrated hydrochloric acid in the original restoration formula and restoration drug formula of the anion exchange resin can cause toxic gas SO2. The restoration method comprises the following steps: 1. transforming the anion resin; 2. washing; 3. removing the iron pollution of the anion resin to lead the anion resin to restore; 4. washing; and 5. regenerating. The restoration drug formula consists of hydrochloric acid, sodium chloride, hydroxylamine hydrochloride and water, wherein the weight percent of the above components in water are as follows: 2-6% of hydrochloric acid, 4-8% of sodium chloride and 1-5% of hydroxylamine hydrochloride. The restoration method is suitable for restoration of the iron pollution of the anion resin and is effective in removing the iron pollution of a cation resin.

The invention provides a flocculant and a preparation method thereof. The preparation method comprises the steps of putting attapulgite and sodium hexametaphosphate into an acid solution, performing ultrasonic treatment, performing filtering and drying, and then performing grinding and sieving, so as to obtain modified attapulgite; putting the modified attapulgite in a solution of Fe(NO3)3, performing magnetic stirring for a reaction, and performing drying, grinding and sieving to obtain iron salt-modified attapulgite; dissolving chitosan in glacial acetic acid to obtain a chitosan solution; putting the iron salt-modified attapulgite in the chitosan solution, performing microwave treatment, and performing drying, grinding and sieving to obtain the flocculant. Compared with the prior art, the flocculant provided by the present invention is simple in preparation, has a large specific surface area, an increased porosity and a large structure volume, and is advantageous for complexing adsorption of heavy metals, reduction of COD in wastewater, adsorption of dye substances, and reduction of the tone and turbidity of printing and dyeing wastewater.

The invention discloses a production process of an antistatic fabric. Conductive yarns are twisted together with polyester-cotton yarns to obtain conductive yarns, and conductive yarns are woven at intervals to obtain antistatic gray fabrics, and then dyed gray fabrics are obtained through singeing, setting and dyeing. After the antistatic finishing of the finishing solution, the antistatic gray fabric is obtained by double dipping and rolling, and finally the antistatic fabric is obtained by the antibacterial and antimite finishing of the antibacterial and antimite finishing agent. In addition to good antistatic properties, the antistatic fabric prepared by the invention is moisture-absorbing, breathable, antibacterial and anti-mite, and has good comfort, and is especially suitable as fabrics for outdoor sportswear and mountaineering suits. The point-to-point resistance of the anti-static fabric reaches 2.8×10 10 Ω, the antibacterial rate of Staphylococcus aureus reached 89.7%, the antibacterial rate of Escherichia coli reached 86.8%, the antibacterial rate of Candida albicans reached 73.6%, the water absorption rate reached 106%, and the moisture permeability reached 8215g / m 2 24h.