31results about How to "Green treatment" patented technology

The invention relates to a method for recovering phosphoric acid by electrolyzing a mixed acid solution, belonging to the field of resource recovery. The method comprises the following steps: puttingthe mixed acid solution into a product tank, wherein the mixed acid solution comprises phosphoric acid, oxyacid and organic acid; and inputting the mixed acid solution in the product tank into an electrolytic cell for cyclic electrolysis, reducing the oxyacid at the cathode of the electrolytic cell, oxidizing the organic acid at the anode of the electrolytic cell, and collecting gas generated in the cyclic electrolysis process through a gas collecting device so as to recover phosphoric acid in the mixed acid solution. The oxyacid is preferably nitric acid, nitrous acid, perchloric acid or hypochlorous acid, and the organic acid is preferably acetic acid, oxalic acid or propionic acid. According to the invention, phosphoric acid recovered through electrolysis can reach 99% or above, the technological process of treatment is simple, environmental pollution caused by direct discharge of waste acid liquid can be avoided, the additional value of products is high, and good economic benefitsand environmental benefits are achieved.

The invention discloses an expanded graphite electrode used for electrochemical removal of heavy metal ions in waste water, a preparation method and application thereof. First, the graphite paper was cut to a suitable size, ultrasonically cleaned in acid, alkali and ultrapure water for one hour each, and then dried. Then, soak the pretreated graphite paper in liquid nitrogen for 5-30min, and then quickly immerse the frozen graphite paper into the ethanol solution. At room temperature, liquid nitrogen molecules vaporize rapidly, and instantly expand in the graphite paper sheet to expand the graphite paper into three-dimensional expanded graphite. Furthermore, the expanded graphite was calcined at 700° C. for 1 h, and ultrasonicated in ethanol for 30 minutes. Finally, it is used as an electrode after being rinsed with a large amount of ultrapure water and dried. The obtained three-dimensional expanded graphite electrode has good conductivity, and heavy metal ions in wastewater can be efficiently removed by electrochemical reduction.

The invention discloses a method for producing edible food packaging paper with soybean hull as a raw material. The method comprises the following steps: the soybean hulls are subject to superfine comminution, are treated by pressurization for 20 minutes to 2 hours under the pressure of between 130 and 320kPa, and are cooled; an enzymatic reaction is performed under the conditions that the mass concentration of soybean hull powder is between 1 and 25 percent, the mass ratio of cellulose to the soybean hull powder is between 0.1 to 1 and 10 to 1, the temperature is between 25 and 70 DEG C, andthe rotating speed is between 50 and 350rpm; the reaction is terminated when the hydrolysis degree of the reaction reaches between 5 and 20 percent; a filtrate is vacuum concentrated and decolorized by hydrogen peroxide, and then a food thickener and a food plasticizer are added for stirring evenly; the ultrasonic degassing is performed for 30 to 120 minutes after the beating; the filtrate is placed into a mold for molding; and the edible food packaging paper is obtained through drying at a temperature of between 55 and 70 DEG C. The method has green raw material and chloride-free environment-friendly process, has no discharge of acid liquids or alkaline liquids, provides a new approach for the utilization of high added values of biomass resources, and also provides broad prospect for thedevelopment of special paper.

The invention belongs to the field of chemical synthesis and discloses a method for synthesizing 4-S-5-Br-2', 3', 5'-O-triacetyluridine. The synthesis method uses compounds 5-Br-2', 3', 5'-O-triacetyluridine as raw materials, phosphorus pentasulfide and Lawesson's reagent are combined as sulfurization reagents, and 1,4-dioxane is used as solvent A chemical reaction occurs to finally prepare 4-S-5-Br-2', 3', 5'-O-triacetyluridine; 4-S-5-Br-2', 3', 5'-O-triacetyl uridine provided by the invention, The method for synthesizing 5'-O-triacetyluridine not only shortens the reaction time, but also greatly improves the vulcanization efficiency. The synthesis method provided by the invention reduces the cost, the post-reaction treatment is simple and convenient, and the yield of the reacted thionucleoside compounds is improved.

The invention relates to a method for treating phenol wastewater. The method comprises: (1) a step of vaporizing phenol waste water with heat energy provided by a solar concentrating heat collection device to form phenol water vapor; and (2) a step of electrolytically oxidizing the phenol water vapor with electric energy provided by a photovoltaic cell . The present invention realizes the degradation of vapor state phenol for the first time, and degrades phenol in the vapor phase to achieve an ideal degradation rate of phenol; in addition, the activated molecules in the excited state with high energy content can undergo less intermediate incomplete oxidation The products are oxidized to carbon dioxide and water with simultaneous production of hydrogen. The invention does not introduce any other form of energy during the electrolysis period, realizes the utilization of the full spectrum of solar energy, breaks the limitation of the traditional photovoltaic method on the utilization of sunlight, truly achieves the purpose of environmental friendliness, and realizes on the basis of energy saving The degradation of phenol wastewater is achieved, which provides a new direction for the green and efficient treatment of industrial organic wastewater.

The invention belongs to the field of environment protection and environment catalysis, and particularly relates to a non-metal-element doped modified titanium oxide catalyst used for photodegradation of household garbage leachate. The catalyst adopts household garbage pyrolysis gas as a non-metal source and a heat source to prepare the non-metal-element doped modified titanium oxide, and then the flat-plate type catalyst is prepared by mixing, rolling, coating, pleating, cutting, drying and calcinating. The catalyst is low in cost, high in photocatalytic activity, high in stability, and capable of efficiently degrading the household garbage leachate under irradiation of sun light and common lamplight, and has a good application prospect in the field of pollutant degradation.

The invention discloses a cooperative filling method for gangue slurry pipelines in a coal mining face. The method comprises: drilling adjacent grouting holes on the side of a coal pillar in an auxiliary transportation roadway at the same distance, and lowering the adjacent grouting pipes, Then install a tee joint at the adjacent grouting pipe on the coal pillar side of the auxiliary roadway to connect the low-level grouting pipe on the pipe hook on the coal pillar side of the auxiliary roadway; as the coal mining face advances, use the adjacent grouting pipe to The advanced adjacent grouting is carried out in the mined-out area of ​​the working face, and the lagging low-level grouting is carried out in the gob area of ​​the working face by using the low-level grouting pipe. The invention can efficiently, greenly and cost-effectively fill the gangue into the goaf without affecting the normal production of the coal mine.

The present invention provides preparation process of nanometer RE fluoride particle. Alcohol solution of RE compound is dispersed in fluorine-containing ionic liquid, and the ionic liquid is heated to decompose and to produce fluorine ion combined with RE ion, so as to prepare great amount of nanometer RE fluoride particles in homogeneous shape. The prepared nanometer particles have size of 50-200 nm and may find wide application in biology, catalyst, lubricant, analysis, optics and other fields. The present invention completes reaction in a green solvent system, and is environment friendly.