35results about How to "Reduce the cost of waste treatment" patented technology

The invention relates to a continuous production system of lithium hexafluorophosphate. The continuous production system comprises a phosphorus pentafluoride generator (2), a micro-channel reactor A (3), a gas-liquid separator A (4), a micro-channel reactor B (6) and a gas-liquid separator B (7), the gas generated by the phosphorus pentafluoride generator (2) is introduced into the micro-channel reactor A (3), the material output by the micro-channel reactor A (3) enters the gas-liquid separator A (4), the gas separated by the gas-liquid separator A (4) enters the micro-channel reactor B (6),and is used as a reaction raw material so as to continuously react, the material output by the micro-channel reactor B (6) enters the gas-liquid separator B (7), and a liquid component is separated out by the gas-liquid separator B (7) and is conveyed into the micro-channel reactor A (3). According to the invention, the raw materials and the by-products are recycled, so that the conversion rate and the utilization rate of the raw materials are improved, and the cost is reduced.

The invention relates to an industrial preparation method of cisatracurium besylate. The preparation method simplifies the refinement operation process, and obtains the high-purity cisatracurium besylate in a non-chromatographic column chromatography preparation mode under the condition of not changing the salt base for the first time. The preparation method can greatly shorten the production cycle, enhance the productivity and increase the yield to 45% above. In the product, the content of cisatracurium besylate is not lower than 98%, the content of total impurities does not exceed 2%, the content of mono quaternary ammonium salts does not exceed 0.2%, the content of other maximum individual impurities does not exceed 0.3%, and the content of isomers does not exceed 0.1%.

The invention relates to the field of herbicides, and discloses a preparation method of quinclorac, which comprises: 1) adopting an N-hydroxyphthalimide compound and azodiisobutyronitrile as catalysts, adopting oxygen as an oxidizing agent, and oxidizing 7-chloro-8-methylquinoline to obtain 7-chloro-8-quinoline carboxylic acid; and 2) by taking azodiisobutyronitrile as a catalyst, carrying out chlorination reaction on 7-chloro-8-quinoline carboxylic acid and chlorine to obtain 3,7-dichloro-8-quinoline carboxylic acid. By means of the method disclosed by the invention, the generation of a largeamount of waste acid and wastewater in a synthesis process can be reduced, and the product yield of quinclorac can be increased.

The invention discloses a method for producing nadroparin calcium from a heparin sodium crude product. The method comprises the following steps: dissolving the raw material crude product heparin sodium in water, precipitating by centrifugation and secondary salting-out to remove impurities in the heparin sodium crude product, carrying out nitrous degradation and reduction to obtain low-molecular heparin containing free sulfates, adding barium chloride to remove the free sulfates generated by degradation, and using an anion exchange resin and adjusting to appropriate parameters to carry out calcium conversion and final impurity removal; and finally, carrying out oxidation decolorization, sterile filtration and dehydration to obtain the nadroparin calcium raw material. By using the crude product heparin sodium as the raw material, the production cost is lowered; the technical steps are simplified to enhance the yield of the nadroparin calcium and reduce the titer loss of the nadroparin calcium; and the method can ensure the safety of the product, and is convenient for industrialized mass production.

The invention relates to a method for preparing cyanobenzene through ammoxidation, which mainly solves the problems that in the prior art, the cyanobenzene production cost is high, or the target product-cyanobenzene is low in yield, or the engineering enlargement effect of a reactor exists, or pollution of three wastes during production process is serious. The method adopts the technical scheme comprising the steps of taking toluene, ammonia gas and air as raw materials in a weight ratio of 1:(2-10):(2-10) on the conditions that the reaction temperature is 300-500 DEG C, the reaction pressure is 0.01-0.1Mpa and the catalyst (WWH) is 0.03-0.1 hour <1>, and conducting contact reaction on the raw materials and a fluid catalyst, thus producing cyanobenzene. The catalyst is a composite with a chemical formula in an atom ratio as follows: V1.0SbaAbBcCdOx, wherein the A is selected from at least one of lithium, sodium, potassium, rubidium, caesium or compositions thereof; the B is selected from at least one of magnesium, calcium, barium, chromium, tungsten, molybdenum, manganese, ferrum, cobalt, nickel, tin or compositions thereof; and the C is selected from at least one of boron, phosphorus or compositions thereof; therefore, the problems in the prior art are better solved, and the cyanobenzene can be used for industrial production.

The invention discloses a new green industrial preparation method of highly pure dutasteride. The method is realized through a synthetic route represented by a figure shown in the specification. The preparation method is adopted to construct a steroid 1,2-olefinic bond in order to avoid raw materials being harmful to environment and having large toxicity, and use of a severely toxic oxidant DDQ is thoroughly avoided from a reaction principle; and the method has the advantages of high efficiency, high purity, greenization, clean industrialization, strong maneuverability and high yield, and the total yield of a two-step reaction is greater than 80%. An iodo intermediate is purified to easily control the quality of finished dutasteride, the purity of the obtained dutasteride product is not smaller than 99.5%, the content of any single impurity does not exceed 0.1%, and medicinal demands are completely met.

The invention discloses a method for synthesizing 2-normal-butyl-4- chloro-5-formylimidazole shown by a formula (I). Imidazolone shown in the formula (II) reacts with bis (trichloromethyl) carbonate shown by a formula (III) and formamide shown by a formula (IV) in an organic solvent for 1-10 hours at the temperature of 20 DEG C below zero to 200 DEG C, and reaction solution is hydrolyzed to obtain 2-normal-butyl-4-chloro-5-formylimidazole. The invention has mild reaction conditions, good selectivity, no generation of phosphorus wastewater and low cost of proposal of waste water, waste gases and waste residues, and is suitable for industrial production.

The invention discloses a method for preparing potassium alum with an aluminum-contained waste catalyst generated from petrochemical production. The method includes: adding sulfuric acid to the aluminum-contained waste catalyst subjected to drying treatment and generated from the production process of a petrochemical enterprise, performing stirring reaction under heating, controlling the mol ratio of Al<3+> to SO4<2> in a reaction system to obtain an aluminum sulfate extract; feeding the obtained aluminum sulfate extract to a reaction kettle, heating to add a saturated sulphate solution, performing stirring reaction, controlling the molar feed ratio of K<+> to Al<3+> to SO4<2> in a reaction system, performing immediate filtration to obtain a filtrate, and performing cooling crystallization and filtration to obtain a coarse potassium alum filter cake with the filtrate to be treated; crushing the coarse potassium alum filter cake, and washing the crushed coarse potassium alum filter cake by adding water to obtain the potassium-alum finished product via filtration and centrifugal dewatering. With the method, resources are saved, environment is protected, and resources are recycled; the method is simple in step and free of relying on expensive experiment and being constrained by rigorous process elements.

The invention discloses a dye penetrant inspection wastewater treatment agent, which is prepared from the following components in parts by weight: 2 to 4 parts of peroxide, 0.2 to 0.4 part of soluble ferrous salt and 0.8 to 3 parts of aluminum salt, wherein the peroxide is selected from any one or two of magnesium peroxide, zinc peroxide, calcium peroxide and sodium peroxide; the soluble ferrous salt is any one or more of ferrous sulfate, ferrous chloride and ferrous nitrate; and the aluminum salt is one or two of aluminum chloride or aluminum sulfate. According to the invention, a Fenton system is formed by .OH generated by the reaction of peroxide and water and the ferrous salt, COD in the dye penetrant inspection wastewater is removed, and the peroxide, the ferrous salt and the aluminum salt in the components of the treatment agent for the dye penetrant inspection wastewater are all solids, so that the treatment agent is convenient to store and low in cost. The invention also discloses a method for treating colorant wastewater by using pickling wastewater, which utilizes the pickling wastewater generated in the inspection and maintenance process of metal workpieces to treat wastes with wastes and reduce the waste treatment cost.