44results about How to "Realize green and clean production" patented technology

The invention relates to a process for preparing LixFeyPzO4 from ferrophosphorus, especially for preparing LiFePO4, LiFe2/3PO4 and Li4/7Fe4/7P8/7O4. A phosphorus source or an iron source which needs supplementing is determined according to the ferrophosphorus and the composition of the LixFeyPzO4 to be prepared. The phosphorus source or the iron source is supplemented according to a mol ratio of 1.0:(0.2-5.0):(0.2-1.5) among total phosphorus elements, total iron elements and total lithium elements. A lithium-containing substance is added and then evenly mixed with the ferrophosphorus. The mixture is then roasted for 0.2-35 hours at the temperature of 400-900 DEG C so as to obtain the LixFeyPzO4. By means of reaction design, raw material combination and byproduct reaction, the process can be a clean production process realizing zero emission. The process adopts the ferrophosphorus as the raw material for preparing the LixFeyPzO4 and has wide raw material source, low cost, high resourceutilization rate and little pollution. The reaction process has relatively low demand on apparatuses. The preparation process is simple, realizes easy oxygen amount control in the reaction process, short production flow, low investment and good benefit, has good application value and is suitable for large-scale, industrial and low-cost preparation of LixFeyPzO4.

The invention relates to a green synthetic method of preparing o-phenylenediamine by reducing o-nitroaniline, wherein the method includes following steps: with o-nitroaniline as a substrate, dissolving the o-nitroaniline in water or in a mixed liquid composed of water and a co-solvent, and adding a supported catalyst under a carbon monoxide atmosphere, wherein the supported catalyst includes a supporter and a catalyst body supported thereon, and performing a reaction to prepare the o-phenylenediamine at 30-150 DEG C. In the method, the supported catalyst is used for preparing the o-phenylenediamine through reduction. The catalyst is high in selectivity and reaction yield and is mild in reaction condition. The method is environment-friendly in production system and less in treatment load of waste water, waste gas and solid waste, achieves green and clean production of the o-phenylenediamine, and is suitable for large-scale popularization.

The invention relates to a dust-proof anti-aging black high-gloss ABS (acrylonitrile-butadiene-styrene) alloy which comprises the following components in percentage by weight: 48-60% of ABS resin, 22-30% of PMMA (polymethyl methacrylate) resin, 12-18% of compatilizer and 4-6% of dust-proof anti-aging high-gloss black master batch. The anti-aging agent and pigment carbon black in the dust-proof anti-aging high-gloss black master batch constitute an anti-aging system; and the carbon nanotubes, pigment carbon black and lauryl amine polyoxyethylene (2) ether constitute a dust-proof system, thereby effectively preventing aging of ABS, and satisfying the requirements of the high-gloss ABS alloy for coloration, color protection, gloss protection and dust-proofing. The preparation method comprises the following steps: preparing the dust-proof anti-aging high-gloss black master batch, and preparing the dust-proof anti-aging black high-gloss ABS alloy by using the master batch. The multifunctional master batch technique provided by the invention eliminates environmental pollution of dust, implements green clean production of the ABS resin and alloy, has the characteristics of low consumption of carrier resin and lubricating dispersant and low consumption of master batch processing energy and processing assistants, and can be widely applicable to formation processing of the ABS and alloy.

The invention discloses a chromium-containing waste water treating and chromium recycling method, and belongs to the field of waste water treatment and comprehensive utilization. The method includes the steps: adjusting chromium-containing waste water oxidation-reduction conditions and a pH (potential of hydrogen) value to be 4-11, and enabling chromium to transform into a chromium hydroxide colloid to precipitate; adding inorganic magnetic particles and organic binding agents according to the proportion of 1/10-10 times of the weight of chromium in chromium-containing waste water; sufficiently stirring and mixing mixture, and separating the mixture by a magnetic separation device to obtain magnetic particle-chromium hydroxide compounds and chromium-free or low-chromium-containing common waste water; soaking the magnetic particle-chromium hydroxide compounds into strong-alkali aqueous solution to dissolve out chromium ions, and performing magnetic separation to obtain magnetic particles and chromium salt solution; enabling the magnetic particles to be recycled, and crystallizing the chromium salt solution to obtain chromium salt products. According to the method, chromium can be directly extracted and separated from the chromium-containing waste water, the chromium-containing waste water is changed into chromium-free or low-chromium-containing common waste water, the waste water generated in subsequent chemical flocculation and precipitation treatment and chromium content in sludge can reach national emission standards, and chromium resources can further be recycled.

The invention discloses a method for preparing a DHA-containing pig feed through schizochytrium limacinum fermentation waste liquid. The method comprises the following steps: regulating the pH value of the schizochytrium limacinum fermentation waste liquid to be 6.5-7.5, and regulating the temperature to be 30-40 DEG C; according to a formula, crushing a pig feed comprising 55-75% of corn, 8-15% of wheat bran, 10-20% of soybean meal, 3-9% of rapeseed meal, 0.5-1.0% of calcium hydrophosphate, 0.8-1.3% of stone powder and 0.05-0.2% of L-lysine according to weight percentage, and mixing to obtain mixed powder; adding the pre-processed schizochytrium limacinum fermentation waste liquid into the mixed powder, stirring for 0.5-2 hours to obtain the DHA-containing pig feed, wherein the adding amount of the pre-processed schizochytrium limacinum fermentation waste liquid into each ton of the mixed powder is 10-30% v/w of the fed materials. According the method, the pig feed rich in DHA is produced through the schizochytrium limacinum fermentation waste liquid, so that a pollution problem caused by waste liquid discharge is solved, and the purpose of water conservation is realized.

Belonging to the field of chemical engineering, the invention relates to a method for reducing the acid content of a dimethyldichlorosilane hydrolysate. The method includes the steps of: (a) subjecting the dimethyldichlorosilane hydrolysate and a calcium chloride aqueous solution to countercurrent mixing and washing; (b) then continuously contacting the hydrolysate with a hydrochloric acid mass fraction gradually reduced aqueous phase, and performing full washing. On the basis of washing, the method provided by the invention introduces calcium chloride to increase the proportion of the hydrolysate and water, realizes rapid layering of the two, avoids emulsification phenomenon during washing, and improves the washing and acid removing effects. In addition, the method provided by the invention significantly reduces the consumption of washing water and lowers the production load, and the calcium chloride can be recycled, thus achieving green and clean production.

The invention relates to a dustproof, antibacterial and ageing-resistant multifunctional color master batch of a polyethylene (PE) plastic slide. The dustproof, antibacterial and ageing-resistant multifunctional color master batch of the PE plastic slide comprises the following components in percentage by weight: 12.5 to 17.5 percent of dust preventive, 15.0 to 20.0 percent of antibacterial agent, 5.0 to 10.0 percent of anti-ageing agent, 17.5 to 22.5 percent of coloring agent, 7.5 to 12.5 percent of dispersing lubricant, 0.5 to 2.0 percent of compatilizer and 25.0 to 35.0 percent of carrier resin. A preparation method of the color master batch comprises the following steps of: adding the dust preventive, the antibacterial agent, the anti-ageing agent, the coloring agent, the dispersing lubricant and the carrier resin into a high-speed mixer and mixing for 10 to 20 minutes; adding the dust preventive and the compatilizer and stirring for 5 to 10 minutes; adding the mixed materials into a double-screw extruder and extruding at 140 to 150 DEG C; and cooling, drying, dicing and packaging to prepare the required master batch. The dustproof, antibacterial and ageing-resistant multifunctional color master batch can eliminate environmental pollution caused by dust in a downstream PE plastic forming process and realizes environment-friendly and clean production of the PE plastic. The dustproof, antibacterial and ageing-resistant multifunctional color master batch has the characteristics of small using amount of the carrier resin and the dispersing lubricant and low master batching forming energy and antioxidant consumption, and can be widely applied to coloring of the PE plastic.

The invention provides a green and clean preparation method of a vanadium compound. The preparation method comprises the following steps of: crushing and ball-milling raw materials; then adding a vanadium element converter or a barium compound; leaching a fired product with clean water; adsorbing and enriching vanadium by using an ion exchange resin, and performing purification to remove barium and impurities; performing counter-extraction to extract vanadium by using a strong alkaline solution to generate a NaVO4 solution and removing other metal ions or impurities which are not dissolved in alkali; adding an ammonium compound to generate ammonium metavanadate and washing the ammonium metavanadate with deionized water or distilled water and drying the same; adding a phosphate diester anti-precipitator, and performing filter pressing and packaging heavy metals; and adding white carbon black of superfine powder into the solution, wherein ammonia and nitrogen are adsorbed in the white carbon black, and the heavy metals are packaged after filter pressing. The method provided by the invention can effectively eliminate original impurities in the raw materials and other impurities generated in the treatment process, and can make full of vanadium-settling wastewater while fully extracting the vanadium compound, so that green and clean production in the production process is realized.

The invention relates to a one-pot-method synthesis process for disperse orange 288. The synthesis process comprises the following specific steps: (1) carrying out diazotization: adding p-nitroaniline into a proper volume of water, introducing a certain volume of sulfur trioxide gas into the water, carrying out pulping, adding a proper volume of ice into the pulp so as to cool the pulp to a temperature below 0 DEG C, rapidly adding a proper volume of 30% (mass percent) sodium nitrite solution into the cooled pulp, carrying out heat preservation, carrying out a test by adopting potassium iodide test paper (a reaction ends when the test paper becomes blue), adding a proper volume of aminosulfonic acid into the reacted solution so as to remove superfluous sodium nitrite, and adding a certain volume of OP-10 and Peregal O into the reacted solution; and (2) carrying out coupling. The synthesis process has the beneficial effects that the product, i.e., the disperse orange 288 is prepared through taking p-nitroaniline as a raw material, subjecting sulfur trioxide and sodium nitrite to a diazotization reaction and carrying out one-pot-method coupling with N-cyanoethyl-N-benzylaniline, the process operation is simple and convenient, the product is high in yield and high in purity, and the volume of waste gases, waste water and waste residues is small, so that environment-friendly and clean production is achieved.

The invention discloses a phenylacetic acid production method, which belongs to the technical field of phenylacetic acid production. The phenylacetic acid production method comprises the following steps of raw material preparation, raw material mixing, synthesis reaction, oil-water phase separation, acidification reaction, crystallization, centrifugation, drying, MVR, condensed water purification and toluene rectification. According to the method, sodium cyanide is replaced with carbon monoxide, two highly toxic materials, namely sodium cyanide and benzyl cyanide, in the production process are reduced, the cost is lower, the product quality is better, and the method can be applied to wider fields due to the fact that the method does not contain cyanide; cyclic utilization of the catalyst, cyclic utilization of materials and cyclic utilization of water are achieved, the technology, the concept and the equipment are advanced, the system inclusiveness is extremely high, and discharge of process wastewater is completely eradicated.

The invention provides a vacuum annealing method for a magnetic material. The method adopts vacuum heat treatment equipment to carry out vacuum quenching with the vacuum degree of less than 6.67 * 10<-3> Pa. In order to ensure slow release of thermal stress and other stresses of the material, the room temperature is heated to 800 DEG C in the heating process, slow heating is carried out for 100 minutes, and slow cooling is carried out for 0.8-1 hour in the cooling process of 700-500 DEG C; and in order to ensure that the magnetic properties of the material meet the index requirements, heat preservation is carried out for 2 hours at 800-900 DEG C, heat preservation is carried out for 3-4 hours at 900 DEG C, and heat preservation is carried out for 2-4 hours in the cooling process at 900-700 DEG C. According to the method, large stress concentration at the position, prone to deformation, of the electromagnetic pure ferromagnetic material of a complex structure in the vacuum heat treatment process is prevented, meanwhile, it can be guaranteed that the magnetic performance of the material meets technological parameters of indexes, the deformation amount of the electromagnetic pure ferromagnetic material of the complex structure after heat treatment can be well controlled, the heat treatment procedure machining time is shortened, and energy conservation, consumption reduction and green and clean production are realized.