50results about How to "Process clean and environmentally friendly" patented technology

The invention discloses a beneficiation method for separating fluorite, white tungsten (black tungsten) and gangue minerals in complex polymetallic ore through flotation. Non-magnetic products of tailings subjected to sulphide ore flotation or tailings subjected to sulphide ore flotation and then subjected to strong magnetic separation for recycling black tungsten serve as two kinds of samples. The pH value is controlled by adding regulators, white tungsten, black tungsten, other gangue combined inhibitors and collectors are added, fluorite is subjected to differential flotation, then, tungsten minerals are subjected to flotation, and therefore fluorite and tungsten can be efficiently recycled. Loss of fluorite in tungsten flotation concentrate is avoided when tungsten minerals are subjected to differential flotation, and the defect that when tungsten flotation is performed, fluorite is difficult to recycle through flotation because the inhibitors have strong inhibition on fluorite, and beneficiation efficiency is low is avoided. Compared with a current beneficiation situation, the fluorite recycling rates of tests on the two different samples are increased by 39% to 48 % and 9% respectively, and the tungsten recycling efficiency is improved by 3%.

The invention relates to a method for extracting two secondary salts from a desulfurized salt-containing waste liquid of coke oven gas. The waste liquid treatment and secondary salt extraction process comprises the following steps: decolorizing, removing impurities, performing reduced pressure concentration on the salt-containing filtrate, separating ammonium thiocyanate, concentrating and crystallizing the ammonium thiocyanate ethanol filtrate, drying the ammonium thiocyanate product, separating ammonium sulfate, concentrating and crystallizing the ammonium thiosulfate filtrate, drying the ammonium thiosulfate product and the like. According to the invention, the desulfurized waste liquid is thoroughly treated, the products are high in recovery rate, no mixed salts or waste water is discharged, no secondary pollution is caused, and the process is clean and environment-friendly. Meanwhile, the invention also has the remarkable characteristics of high adaptability, high production elasticity, high resource utilization rate and the like.

The invention provides rapeseed protein feed which is solid powder or particulate matter. The content of protein is between 35 and 50 percent (N * 6.25, dry basis); the content of water-soluble nitrogen is between 25 and 35 percent; the content of small peptide is between 10 and 25 percent; the content is counted by weight percentage; and thioglycoside accounts for 5 to 15 micromole per gram of rapeseed protein feed. The invention also provides a method for preparing the rapeseed protein feed; one of bacillus subtilis, lactobacillus or candida utilis and actinomucor elegans or aspergillus usamii are compounded to prepare a fermenting agent; the fermenting agent is added to pulverized rapeseed dreg for solid fermentation; and a culturing substrate is sterilized, dried and pulverized to obtain the rapeseed protein feed rich in small peptide. The preparation method is environment-friendly, has mild reaction condition, can fully exert the functions of protease hydrolysis and thioglycoside degradation of microbe and is a method which has low cost and is suitable for the industrialized large-batch preparation of the rapeseed protein feed.

The invention discloses ceramsites containing municipal sewage treatment sludge and ceramic polishing slag and preparation methods of the ceramsites. A foamed ceramsite containing municipal sewage treatment sludge and ceramic polishing slag is composed of the following raw materials: municipal sewage treatment sludge, ceramic polishing slag, an admixture and a foaming agent. A sintered ceramsite containing municipal sewage treatment sludge and ceramic polishing slag is composed of the following raw materials: municipal sewage treatment sludge, ceramic polishing slag and an admixture. Meanwhile, the invention further discloses the preparation methods of the ceramsites containing municipal sewage treatment sludge and ceramic polishing slag. The municipal sewage treatment sludge and ceramic industrial solid waste ceramic polishing slag powder are comprehensively utilized, a novel solid waste recycling technology is provided, and the technology provides an effective approach for avoiding secondary pollution of the municipal sewage treatment sludge with relatively high treatment difficulty. The preparation methods have the advantages such as high waste slag utilization ratio, wide raw material source, clean and environment-friendly process, simple step, shortened production period and energy saving.

The invention discloses a hydrolysis process for hydroquinone and relates to a hydrolysis process during hydroquinone synthesis by subjecting p-aminophenol to diazotization and hydrolysis processes. The process includes: adding basic cupric carbonate, cupric sulfate and solvents into a hydrolysis reaction kettle, dropwise adding diazonium solution of 0+/-0.5 DEG C obtained by subjecting sodium nitrite and dilute sulfuric acid to diazotization and performing hydrolysis reaction at a reaction temperature of 85 DEG C-88 DEG C. Raffinate phase does not generate waste acid, and the copper recovery rate reaches to more than 99.5%, so that a disadvantage of high copper price is made up; and sodium sulfate is obtained by means of concentration and crystallization of filtrate, concentrated water is used for preparing acid for diazo reaction, and crystallized mother solution of the sodium sulfate is used for preparing cupric sulfate solution for hydrolysis, so that clean production is realized.

The invention discloses a method for synthesizing adefovir serving as anti-hepatitis B virus medicine, which belongs to the field of antiviral chemical medicines. In the method, adefovir is obtained by using adenine as a starting raw material and by three nucleophilic substitution reactions. In the invention, the reaction conditions are mild, the method is simple, easy to implement, efficient and high in selectivity, fewer byproducts are produced, and the yield and purity of the product are high.

The invention relates to a method for producing an aviation fuel from fatty alcohols, and belongs to the technical field of aviation fuels. The method comprises the following steps: 1, converting the fatty alcohols into C8-C16 n-alkenes under catalytic dehydration conditions; and 2, preparing C8-C16 isoalkanes from the n-alkenes obtained in step 1 under hydrogenation isomerization conditions. The C8-C16 isoalkanes obtained through the method can be mixed with traditional petroleum base aviation fuels according to arbitrary proportions. The method has the advantages of renewable raw material, high yield and high quality of the above product, and environmentally friendly and clean process.

The invention belongs to the technical field of organic chemicals, and relates to a synthesizing method for a pesticide intermediate 4-formyl menthyl valerate, more particularly to a method for synthesizing amyl ester by taking 3-methyl-2-(4-morpholinyl)methyl cyclobutyrate as a raw material and performing catalytic acidolysis by using highly acidic resin. The yield of the amyl ester is not less than 80 percent; a byproduct morpholine exists in a reaction liquid in a free state; the morpholine is recycled through a commonly used chemical operating unit. The synthesizing method for the pesticide intermediate 4-formyl menthyl valerate has the advantages of that an operation process is simple and continuous, morpholine serving as the raw material is convenient to recover, equipment is not corroded, the industrial wastewater amount is small, and the product yield is high.

The invention discloses a kitchen waste treatment process. The kitchen waste treatment process comprises the following steps of conveying kitchen waste into a pre-treatment system for screening, pulping and heating; conveying the kitchen waste treated by the pre-treatment system to a recycling system for three-phase separation, to obtain crude oil, residues and waste water; processing and recycling the crude oil and residues in the recycling system, and leading wastewater to enter an anaerobic reactor through the pre-treatment system; conveying marsh gas generated by the anaerobic reactor to an energy recovery system, and conveying the wastewater and floating oil generated by the anaerobic reactor to a post-treatment system; and purifying and discharging the generated wastewater through the post-treatment system, and returning activated sludge generated by the post-treatment system to the recycling system. According to the kitchen waste treatment process, energy and resources in the waste can be fully utilized, the kitchen waste is harmlessly treated after the resources are utilized, and the whole process is environmentally friendly, clean and easy to use.

The invention discloses a method for using a membrane technology for recycling mixed industrial salt waste solutions. The method comprises the following steps of (1) adding a decolorising agent into the mixed industrial salt waste solutions, stirring a mixture for 2-3 h, and filtering the mixture to obtain a solution A; (2) using alkali for adjusting a pH of the solution A to be 7-9, and producinggas A and a solution B from the solution through an air stripping tower; (3) making the gas A run through a spray tower and then run through membrane 1 for concentration to produce stronger ammonia water; (4) producing a solution C and a solution D from the solution B through membrane 2; (5) producing a sulfuric acid solution and a sodium hydroxide solution from the solution C through action of membrane 3; (6) producing sodium chloride crystals and a solution E after conducting concentration and centrifugation on the solution D; and (7) obtaining sodium nitrate crystals after cooling the solution E, and recycling backwater. According to the method for using the membrane technology for recycling the mixed industrial salt waste solutions, the technology is clean and environmentally friendly, required equipment is simple, operation is easy, energy consumption is low, and the various chemical products can be obtained from the three kinds of mixed salt solutions at the same time, so that economic benefits and environmental benefits are well combined.

The invention discloses a method for separating and enriching < 6 > Li isotope through extraction-electromigration coupling. The method comprises the following steps that ionic liquid, a diluent and a complexing agent are uniformly mixed to form an extraction organic phase; the extraction organic phase is uniformly mixed with a lithium salt solution, and a lithium-loaded organic phase is collected after extraction; an anode, a cathode, the anolyte, catholyte and an isolating membrane jointly form an electromigration system, wherein the anolyte is the obtained lithium-loaded organic phase, and the isolating membrane is arranged between the anolyte and the catholyte; and finally, the electromigration system is electrified to obtain < 6 > Li-enriched catholyte. According to the method, under the action of an electric field, the lithium isotope separation effect continuously exists, the enrichment limitation of the front end and the tail end of an ion migration flow does not exist, the isolation membrane is not subjected to saturation capacity limitation, meanwhile, all solution phases can be recycled, and the process is clean and environment-protecting; and in addition, the process has no special requirements on temperature, humidity, air and the like, and sealing is not needed.

The invention relates to a method for preparing N-acetylglucosamine fermentation clear liquid by using a composite flocculant, and belongs to the field of bioengineering. The method comprises the following specific steps of: inactivating N-acetylglucosamine fermentation liquid; adding an inorganic flocculant, and stirring to obtain N-acetylglucosamine fermentation liquid containing the inorganic flocculant; adding an adsorbent and a filter aid, stirring, adding a prepared organic polymer flocculant, stirring uniformly, and standing for flocculation for 30-60 minutes to obtain a flocculation liquid of the N-acetylglucosamine fermentation liquid; and performing plate-frame pressure filtration to obtain the N-acetylglucosamine fermentation clear liquid. The flocculation impurity removal process has an obvious effect, the clear liquid obtained after plate-frame filtration has high yield, the water content of mushroom dregs is low, and the use amount of the flocculant is reduced by composite flocculation. The process is simple to operate, has no three-waste emission, and is an environment-friendly, simple and efficient method for preparing the acetylglucosamine fermentation clear liquid.

The invention discloses an ornidazole green synthetic method, which is characterized in that 2-methyl-5-nitroimidazole and chloropropylene oxide are taken as raw materials, ethyl acetate is taken as a solvent, macroporous acidic high-molecular resin is taken as a catalyst, chloropropylene oxide is catalyzed and is performed with ring opening, and is performed alkylation condensation with 2-methyl-5-nitroimidazole, the ornidazole crude product can be obtained by one step reaction, and a supernatant liquid obtained by centrifugal separation is an ornidazole condensation liquid; the supernatant liquid is separated to obtain a mother liquor containing a catalyst, the mother liquor containing the catalyst is activated, the catalyst can be reutilized; and the ornidazole condensation liquid is performed with the processes of distillation, residues decoloring, filtering crystallization and recentrifugation to obtain the ornidazole. The ornidazole green synthetic method has high catalytic efficiency, mild reaction and reduced cost, the preparation yield can be increased from 66% to 75%, and the environmental pollution of waste water containing aluminum salt can be avoided.

The invention provides a synthesis method of aminophenol. According to the method, by reacting nitrophenol with hydrogen under the conditions of an auxiliary agent and a solvent, an aminophenol product with high selectivity and yield can be prepared, the auxiliary agent can well control the reaction depth of nitrophenol and hydrogen, thereby inhibiting the side reaction, enhancing the purity of the final product, overcoming the problems of poor selectivity and high three-waste amount in the common hydrazine hydrate, sodium hydrosulfite and other reducing agents in the prior art, and having higher industrial application value.

The invention provides a method for treating pickling wastewater and recovering byproducts through reduced pressure and low temperature catalytic fractionation, belongs to the technical field of environmental protection, and especially relates to terminal treatment of wastewater containing hydrochloric acid and metal salts and recycling of wastes. The method comprises the following steps: 1, preparing a material: filtering the pickling wastewater to remove particles with large particle sizes, and fully mixing the filtered pickling wastewater with a catalyst in a mixing device until uniformity; 2, fractioning: pumping the obtained mixed solution to a low pressure fractioning device, and separating an acid solution at a low temperature under a low pressure; 3, separating metal salts: allowing the obtained residual liquid to enter a metal salt separation device, adjusting the pH value until the metal salts precipitate, and carrying out adsorbing separation by using a rotating magnetic disc; 5, carrying out solid-liquid separation: allowing slurry to enter a solid-liquid separation device, and dehydrating; and 5, carrying out catalyst concentration: allowing the obtained metal salt removed residual liquid to enter a concentration device, carrying out low temperature and low pressure concentration, and returning the obtained concentrated catalyst to make the catalyst participate in the reaction. The reduced pressure and low temperature catalysis method is adopted to treat the pickling wastewater, so the acid solution and metal salt recovery rate is improved, the treatment cost is reduced, and the present technological gaps in low-cost, high-efficiency and zero-pollution treatment of the pickling wastewater are filled.