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

The invention relates to a method for preparing iron phosphate from ferrophosphorus. The ferrophosphorus is used as a part or the whole of a phosphorus source and an iron source for preparing the iron phosphate. The phosphorus source or the iron source is supplemented according to a mol ratio of (0.8-1.2):1.0 between total phosphorus elements and total iron elements. The ferrophosphorus is roasted in a dry and oxygen-containing atmosphere. The iron phosphate product is obtained by means of dry or wet oxidation product reaction. The method adopts the ferrophosphorus as the raw material for preparing the iron phosphate, makes full use of elements in the ferrophosphorus and creates a novel preparing process of iron phosphate. In addition, as the reaction process can be used for weakening or eliminating the influence of impurity elements in the ferrophosphorus on the iron phosphate product, the method indirectly purifies the ferrophosphorus and eliminates the influence of the impurities in the ferrophosphorus and the problem of severe corrosion caused by the existence of water during the roasting of ferrophosphorus. The reaction process has relatively low demand on apparatuses. The preparing method has simple process, short production flow and low production cost, is clean and environment-friendly, realizes high resource utilization rate, low investment and good benefit and is suitable for large-scale, industrial, low-cost and clean preparation of iron phosphate.

The invention discloses a method for synthesizing bis(dimethylaminoethyl)ether (BDMAEE) under the catalysis of a metal catalyst. The method comprises the following steps: preparing a metal oxide; then preparing the metal catalyst from the metal oxide; and with dimethylamine and dimethylaminoethoxyethanol as raw materials, preparing BDMAEE under the catalysis of the metal catalyst, wherein a main inorganic by-product is water, and produced organic by-products can be recycled through distillation and purification. The method provided by the invention has good economic benefits and overcomes the problem of environmental pollution of conventional BDMAEE production processes.

The invention relates to a method for preparing FexPO4 by electrolyzing ferrophosphorus, which comprises the following steps: by using ferrophosphorus as the anode and providing an oxygen source by using oxygen in water as the product, electrolyzing to obtain a FexPO4 solution, wherein only ferrophosphorus and water are consumed in the reaction process; adding basic oxides to regulate the pH value of the solution so as to settle out FexPO4; and granulating, filtering and washing to obtain the finished FexPO4 product. In the method, cheap ferrophosphorus is converted into high-value FexPO4 by using the electrolytic reaction process; the source of ferrophosphorus is not limited; the influence of impurity elements on the product can be eliminated; the product can be granulated into controlled shape and particle size; the byproduct H2 can be recycled; the treated filtrate can be used cyclically; the obtained finished FexPO4 product has the advantages of high purity, small particle size, easily controlled shape, and low power consumption; the reaction process has low requirements for equipment and is easy to operate; and the preparation method has the advantages of simple technique, high resource utilization rate, low cost, low investment, good benefit, high cleanness and environmental protection, can be easily industrialized, and is suitable for high-value comprehensive utilization of byproducts in chemical industry and large-scale industrial low-cost clean production of high-end phosphates.

A process for producing saponin and rhamnose from turmeric belongs to the technical field of saponin extraction. The method comprises the following steps of: (1) pulverizing a dried turmeric material; (2) mixing the sieved material with low molecular alcohol and stirring into homogenate; (3) heating the homogenate and then sending into a ceramic membrane extraction apparatus for extraction; (4) adding acid liquor into the concentrated mixed liquid for hydrolysis, filter pressing the solid-liquid mixture after hydrolysis, and drying to obtain a hydrolyzate; (5) mixing the hydrolyzate with petroleum ether, sending into the ceramic membrane extraction apparatus for extraction, performing crystallization separation on the extracted mixed liquid to obtain a saponin crystal substance; (6) adding the acid hydrolysis waste water in step (4) into lime water for neutralization, and then decolorizing, separating, concentrating and crystallizing to obtain the rhamnose. The process for producing saponin and rhamnose from turmeric achieves the clean production of the saponin, the acid hydrolysis waste water generated during production is less than 5% of a traditional process, and the yield of saponin is improved by 30% or above.

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 discloses a method for intensively extracting polysaccharides from a rice culture medium for cordyceps militaris. The method comprises the following steps: carrying out superfine crushing, ultrahigh pressure treatment and ultrasonic intensified flash extraction on the cordyceps militaris culture medium, adding amylase to an extract solution to realize enzymosis, concentrating enzymatic hydrolysate, adding polyethylene glycol, sufficiently stirring and dissolving, standing over night, centrifuging, washing precipitate with edible alcohol, adding hot water to dissolve, removing insoluble substances, and drying to obtain the polysaccharides. According to the method disclosed by the invention, configuration guiding of a process for promoting effective dissolution of polysaccharides is highlighted according to the resource advantage of the rice culture medium for cordyceps militaris, the clean production ideal is embodied by technical model selection, by adopting novel physical and biological integrated means, polysaccharide recovery technical output characterized by high speed, high efficiency, time saving, low consumption and environmental friendliness is realized, and the edible safety of the extracted polysaccharides is ensured from the production link.

The invention discloses a water saving method in the process of producing sodium gluconate through aspergillus niger fermentation. The method comprises the following steps of on the base of the existing processes of producing the sodium gluconate through the aspergillus niger fermentation, concentrating and collecting evaporation condensate water produced in the evaporation concentration process of a fermentation liquor, carrying out reverse osmosis on the evaporation condensate water, respectively recycling pure water and thick water produced after processing and realizing the water conservation. By utilizing the method disclosed by the invention, the usage amount of the ingredient fresh water in the process of producing the sodium gluconate through the aspergillus niger fermentation can be greatly reduced: the usage amount of the fresh water can be reduced by about 50% per ton of products; in the meantime, the temperature of the pure water produced in the reverse osmosis process of the evaporation condensate water is high, so that the steam consumption in the heating sterilization process of feed liquid is reduced by about 20%; low-concentration sewage discharge in the production process is reduced and the green clean production is realized; and therefore, the method is worthy of wide popularization and application.

The invention belongs to the technical field of rare earth metallurgy, and particularly relates to a method for decomposing bastnaesite through calcification transformation-leaching. The method comprises the following the steps of: carrying out activation pretreatment on rare earth ore concentrate, carrying out calcification transformation pretreatment on the activated ore, carrying out acid leaching on transformed slag, extracting rare earth chloride fine liquid to finally obtain a solution with thorium-iron slag and cerium chloride or lanthanum chloride or praseodymium chloride or neodymium trichloride, and efficiently separating valuable elements such as a rare earth element, a fluorine element and a thorium element. According to the method, energy consumption and fuel consumption are reduced, and when the low-temperature baking is carried out below 500 DEG C, only carbonates are decomposed, so that the reaction activity of the rare earth ore concentrate is supplied, and simultaneously the waste of fluorine resources and the emission pollution are avoided; and therefore, the method belongs to a green clean technology.