45results about How to "Reduce investment in environmental protection" patented technology

Disclosed is an epoxy-modified polyphenylene oxide resin. The epoxy-modified polyphenylene oxide resin has a structural unit as shown in formula (I), and which is produced by the following steps: adding polymerization reaction solvent to 100 parts of solid polyphenylene oxide resin for forming a liquid polyphenylene oxide resin solution, and then adding 5-60 parts of epoxy resin and 0.001-5 parts of a catalyst to the solution, stirring and mixing at the temperature of 80-140°C for 1-3 hours to obtain a prepolymerization solution. Further disclosed are a resin composition containing the epoxy-modified polyphenylene oxide resin and an application for preparing printed circuit board. The epoxy-modified polyphenylene oxide resin composition has excellent impregnation properties for glass fiber cloth, the preparation process of which is simple, highly efficient and environmentally friendly, and the product purity of which is highly controllable. The epoxy-modified polyphenylene oxide resin composition can be used for making a laminated material and a copper clad laminated plate, which has excellent heat resistance and dielectric properties and is in favor of signal transmission of high frequency circuit board.

The invention relates to a method for preparing a cathode material-lithium iron phosphate of a lithium ion battery by utilizing steel slag. The method comprises the steps as follows: mixing the steel slag with a water-soluble carbon source compound water solution, and carrying out microwave heat treatment, reduction and magnetic separation to obtain a steel slag extract; reacting the steel slag extract with a mixed solution of diluted sulfuric acid, hydrogen peroxide and phosphoric acid, and extracting to obtain a calcium-free steel slag filter cake; adding lithium carbonate and the water-soluble carbon source compound water solution into the filter cake to obtain a precursor; and carrying out microwave sintering on the precursor to obtain the cathode material-lithium iron phosphate. Part of conventional raw materials are replaced with the steel slag as raw materials, so that the cost can be reduced by more than 30% and the obtained product is good in cycle performance; the conventional processes of ball-milling, drying and the like are removed, so that the process and the control operation are simple, inert gas does not need to be used in the sintering process, harmful gas such as nitrogen oxide and the like is not generated, the pollution is avoided, and the environment is protected; and the method is widely suitable for industrial production.

The invention discloses a method for co-producing methyl benzoic acid, methyl benzoate and phthalic acid diester, comprising: (1) continuously feeding xylene, a catalyst and an oxygen-containing gas into an oxidation reactor to carry out reaction, by controlling the amount of oxygen-containing gas to control the tail oxygen concentration to be no more than 5%, to obtain an oxidation reaction liquid; (2) enter the obtained oxidation reaction liquid into an initial distillation tower for rectification separation, to obtain low boiling point components and initial (3) enter the rectifying tower still liquid into the rectifying tower for rectification to obtain toluic acid product and rectifying tower still liquid; (4) mix the rectifying tower tower liquid with alcohol , carry out the esterification reaction, control the reaction end point to be that the content of toluic acid<0.5wt%, obtain the esterification reaction solution; (5) carry out rectification separation with the esterification reaction solution obtained, obtain methyl benzoic acid ester respectively and diester phthalate products. The invention has the advantages of simple process, less equipment investment, environmental protection and good comprehensive economic benefits.

The invention discloses a method for co-producing methylbenzoic acid, methylbenzonitrile and phthalonitrile, comprising: (1) continuously feeding xylene, a catalyst and an oxygen-containing gas into an oxidation reactor for reaction, Obtain the oxidation reaction liquid; (2) enter the oxidation reaction liquid into the initial distillation tower and carry out rectification separation, stop the rectification when the methyl benzyl alcohol content reaches 0.01~0.15wt% in the initial distillation tower bottom liquid, obtain low boiling point component and (3) enter the rectification tower with the initial distillation tower still liquid; (3) stop rectification when toluic acid content reaches 30~90wt% in the rectifying tower tower still liquid, obtain formosan (4) mixing the rectifying tower and tower liquid with ammonia to obtain a nitrile-containing reaction liquid; (5) carrying out rectification and separation of a nitrile-containing reaction liquid to obtain methylbenzene respectively Carbonitrile and phthalonitrile products. The invention has the advantages of simple process, less equipment investment, environmental protection and good comprehensive economic benefits.

The invention discloses an energy-saving and environment-friendly comprehensive utilization method for tea resources. The energy-saving and environment-friendly comprehensive utilization method comprises the following steps: (1), taking tea raw materials, and extracting by hot water to obtain a tea water part and a tea residue part after solid-liquid separation; (2), preparing the tea water part into an instant tea product through an instant tea production line, wherein wastewater is generated in a production process; (3), carrying out sewage treatment onto the wastewater, separating clear water which reaches emission standards and sludge after the treatment, and discharging clear water; (4), drying the sludge through pressing by a diaphragm type plate-and-frame filter press; (5), drying the tea residue part obtained in the step (1) through pressing by the diaphragm type plate-and-frame filter press; (6), placing the dried tea residue into a three-pass stoke roller dryer for drying; (7), carrying out extrusion forming on the dried sludge obtained in the step (4) and the dried tea residue obtained in the step (6) by a ring-mould granulator after mixing to obtain a tea residue biomass particle fuel; and (8), using the tea residue biomass particle fuel as a fuel for a biomass water heater and a biomass hot air furnace.

The invention discloses a method of co-producing methyl benzoic acid, methylbenzoyl chloride and phthaloyl dichloride. The method comprises the following steps: (1) continuously introducing xylene, acatalyst and oxygen-containing gas into an oxidizing reactor to react to obtain an oxidized reaction solution; (2) rectifying and separating the oxidized reaction solution to obtain a low-boiling-point component and an initial evaporative tower bottom; (3) rectifying the initial evaporative tower bottom to obtain a methyl benzoic acid product and a tower bottom; (4) carrying out an acylating chlorination reaction on the tower bottom and an acylating chlorination reagent to obtain an acyl chloride reaction solution; and (5) rectifying and separating the acyl chloride reaction solution to separately obtain methylbenzoyl chloride and phthaloyl dichloride products. The method provided by the invention has the advantages of being simple in process, small in equipment investment, green and environment-friendly and good in comprehensive economical benefit.

The present invention relates to a clean production processing method of turmeric. Said method includes the following steps: cleaning turmeric raw material, pulverizing, ultrasonic auxiliary grinding, pressing, centrifugal separation, first membrane concentration, hydrolysis, press filtration, extraction, neutralization and secondary membrane concentration.

The invention discloses a smelting gas acid-production wastewater treatment system which comprises a wastewater storage tank (1), a drug storage tank (2), a supergravity reactor (7) and a liquid storage tank (10), wherein the wastewater storage tank (1) is used for storing heavy metal wastewater; the drug storage tank (2) is used for storing a drug solution reacting with the heavy metal wastewater; the supergravity reactor (7) is communicated with the wastewater storage tank (1) and the drug storage tank (2); the heavy metal wastewater in the wastewater storage tank (1) reacts with the drug solution in the drug storage tank (2) in the supergravity reactor (7); the liquid storage tank (10) is connected with a liquid outlet (14) of the supergravity reactor (7); and the liquid after reaction in the supergravity reactor (7) is discharged into the liquid storage tank (10) through the liquid outlet (14). By adopting a novel mass transfer technology, the smelting gas acid-production wastewater treatment system disclosed by the invention can reduce a sodium sulfide reaction tank, enhance the mass transfer and improve the treatment efficiency of heavy metal and arsenic in the acid water, and is particularly suitable for a place with limited height and size.