92results about How to "Ease of environmental protection" patented technology

The invention discloses a dry distillation production process for lignite or high volatile coal. A high-temperature dry distillation gas serving as a heat carrier enter a dry distillation furnace to transmit heat with coal inside the furnace by contact to change the coal into semicoke through pyrolysis and dry distillation; the gas overflowing through the dry distillation flows into a heat carrier gas and then out of the furnace together; after the gas from the furnace is cooled and purified, which is equivalent to that a part of the original heat carrier gas is heated through a partition to a high temperature to serve as a heat carrier to return to the dry distillation furnace for recycling; and the balance of gas serves as an external supply. The dry distillation production process has the advantages of both internal and external heat dry distillation and obtains the approximately same gas purity as that of the external heat dry distillation process, so that the gas for the externalsupply has a high quality, heat value and application value and is an ideal chemical raw material or high-quality fuel; moreover, all the dry distillation gas can be used for the external supply; thecoal is slightly affected by a temperature and uniformly heated; tar has a high yield; the system has a wide heat source and can use low-quality fuel smoke, such as powdered coal, the gas and the like; and the system has a simple flow, is easy to operate and control in production and operation and has less industrialization construction investment.

The invention discloses a pollution-free, high-efficiency and long-distance pipe installing and cleaning method, and belongs to the field of pipe cleaning. The pollution-free, high-efficiency and long-distance pipe installing and cleaning method comprises the following steps: installing a ball sending device and a ball receiving device, temporarily testing the leakage and the pressure of a system, sending a diameter-measuring ball, drying, derusting, passivating, chemically degreasing, drying, inspecting and accepting, performing nitrogen protection and transferring, wherein in the derusting, passivating and chemically degreasing steps, a pipe-cleaning train of a pipe cleaner-a chemical agent-a pipe cleaner is used, namely the chemical agent is integrally injected into a space between a first pipe cleaner and a second pipe cleaner; the chemical agent comprises a passivating agent or a degreasing agent; the degreasing agent adopts the formulation as follows: 2-3.5% of sodium tripolyphosphate, 1-2% of sodium carbonate, 0.5-1.5% of sodium hydroxide, 0.2-0.4% of sodium borate, 0.1-0.2% of disodium ethylenediamine tetraacetate, 0.05-0.1% of sodium oleate, 0.05-0.1% of sodium dodecyl sulfate, 0.05-0.1% of alkylphenol ethoxylate and 92.1-96.05% of water. By the pollution-free, high-efficiency and long-distance pipe installing and cleaning method, synchronous and high-efficiency operation of physical cleaning and chemical cleaning of a long-distance pipe can be achieved.

The invention provides a synthesis method of lamellar ZSM-5 zeolite. The synthesis method comprises the following steps: crystal seed pretreatment, silica-alumina gel preparation and the like. The synthesized zeolite is a typical MFI structure, has the advantages of high crystallinity and large specific area, has the lamellar shape with the lamellar thickness of 50nm or so, and has favorable application potential in the aspects of high-molecular reaction and the like by using the unique shape and physical property characteristics. Compared with the prior art, the synthesis method does not need any organic template or surfactant, has the advantages of simple synthesis technique operation, lower cost, no environment pollution and the like, and thus, can be popularized and applied in industry.

The invention relates to a method for recovering rare earth La and Ce from and FCC dead catalyst and mainly solves the problems in the prior art that the FCC dead catalyst can hardly be disposed in anenvironment-friendly manner, disposal cost is high and the recovery rate is low. Through use of the method for recovering the rare earth La and Ce from the FCC dead catalyst, an acid solution is taken as an extracting agent; under a certain temperature and a certain concentration, the acid is used for leaching rare earth elements in the catalyst into the solution, a leaching liquid containing therare earth is obtained, a purified rare earth solution is obtained through removal of Al and Si from the leaching liquid, and then a pure rare earth solution is obtained through extraction and back-extraction. The technical solution effectively solves the above problems and can be used for recovering the rare earth La and Ce from the FCC dead catalyst.

The invention relates to a preparation method of a Pd/C catalyst which is used for hydrogenation refining of crude isophthalic acid, and the preparation method is mainly used for solving the problems of low dispersion of metal Pd and low microcrystal content in the catalyst which is prepared by the prior art. The preparation method firstly carries out the pickling of activated carbon carrier, then uses water or alkali for washing till neutral nature and carries out the drying, water solution containing nitrite ions is further used for infiltration, wherein, the concentration of the nitrite ions is 0.01 to 0.5N, the using amount of infiltration liquid is 0.1 to 3.0 times of the saturated absorption amount of the activated carbon carrier, the infiltration time is 2 to 24 hours; the activated carbon is then used for removing water, Pd compound is impregnated, and a reducing agent is further used for carrying out the reduction to obtain a catalyst product; therefore, the technical proposal can better solve the problems and can be used in the industrial production for hydrogenation refining of the crude isophthalic acid.

The invention relates to an apparatus for producing a compound containing carbon and sulfur, in particular to an apparatus for preparing carbon bisulfide with a circulating fluidized bed. The apparatus solves the disadvantages of the existing carbon bisulfide production process and equipment and comprises a storage hopper, a feeder and a fluidized bed furnace, a hot carbon pipeline is arranged under the fluidized bed furnace, the other end of the hot carbon pipeline is communicated with a pre-raiser, the upper part of the pre-raiser is connected with a riser which is provided with a nozzle, the upper end of the riser extends into a settler, the end of the riser is provided with a quick separation device, the internal top part of the settler is provided with a cyclone separator, the internal lower part of the settler is provided with a stripping section, and the lower part of the stripping section is provided with a cold carbon pipeline. By adopting the pre-raiser, the riser and the fluidized bed coating, the apparatus of the invention improves the contact efficiency of reactants; the sulfur can be a liquid state, the temperature is lower, the apparatus is simple; the arrangement of the stripping section can reduce pollution, and improve product yield; the apparatus has the advantages of simple structure, low cost, easy production, and is beneficial to realizing the continuous and automatic production and environmental protection treatment in course of production.

The invention provides a production method of epoxide through a dual-alkali chlorohydrination method. According to the preparation method, hydrogen chloride produced in a process of dehydrating calcium carbonate and reacting with chlorine gas to generate hypochlorous acid; high-concentration hypochlorous acid without the hydrogen chloride is used for carrying out chlorohydrination reaction; then sodium hydroxide is used for carrying out saponification reaction, and carbon dioxide produced in a process of removing the hydrogen chloride is recycled by utilizing calcium hydroxide slurry. According to the method provided by the invention, a few of byproducts are generated in a chlorohydrination process and raw materials to be subjected to chlorohydrination are transformed into more target products; in a saponification process, no waste dreg is generated and a saponification tower is not blocked; less residual water is generated in a saponification reaction process; the saponification residual water has a simple composition, and environment-friendly treatment and resource utilization are easy to realize; materials without the hydrogen chloride have light corrosion on equipment; calciumhydroxide and the calcium carbonate, which are generated in a system, can be cyclically utilized; the epoxide produced by the method provided by the invention has remarkable economic benefits and environmental benefits.

A synthetic method for 2-chlorobenzonitrile is disclosed and includes the following steps: performing a reaction on o-chlorobenzoic acid and ammonia to generate ammonium o-chlorobenzoate, high temperature dehydration is performed to produce 2-chlorobenzamide, and the high temperature dehydration is performed again to generate the 2-chlorobenzonitrile. In a production process, especially ultrasonicor microwave catalyzed high temperature dehydration is utilized to produce the 2-chlorobenzonitrile, the yield is up to 93%, and the purity of products can reach 97%. And the method has the characteristics of short process route, high reaction yield, good product purity, safe and clean whole reaction process, and easy environmentally friendly treatment. Production of waste water of the 2-chlorobenzonitrile can be effectively reduced, clean production of the 2-chlorobenzonitrile is achieved, unreacted raw material o-chlorobenzoic acid and intermediates can be recovered and then recycled and utilized, and the production cost can be significantly reduced. Moreover, the method can avoid the defects that traditional process equipment is complex, is high in operation requirements and is low inproduct yield, has the characteristics of less "three wastes" and less pollution, is another ideal way to achieve industrial production, and has strong market competitiveness.

The invention discloses an environment-friendly high-efficiency modified asphalt waterproof roll mixing device and process. The device comprises an asphalt preheating kettle, a tire powder mixing kettle, a filling material mixing kettle, an SBS modifier mixing kettle and a modified asphalt mixing kettle which are connected with one another through a pipeline, a heating device and a stirring device are arranged inside each of the asphalt preheating kettle, the tire powder mixing kettle, the filling material mixing kettle, the SBS modifier mixing kettle and the modified asphalt mixing kettle, the tire powder mixing kettle, the filling material mixing kettle and the SBS modifier mixing kettle are parallelly connected through a mixing pipe, a discharging port of the asphalt preheating kettle is connected with feeding ports of the tire powder mixing kettle, the filling material mixing kettle and the SBS modifier mixing kettle respectively, and discharging ports of the tire powder mixing kettle, the filling material mixing kettle and the SBS modifier mixing kettle are connected with a feeding port of the modified asphalt mixing kettle respectively. By using the device, various materials are separately stirred and mixed, and powder and oil are avoided forming a mixture; each material is dispersed more uniformly, so that stirring time is shortened effectively.

The invention relates to a load type palladium/carbon catalyst used for hydrogen refining and a preparation method, mainly solving the problems in the prior art that Pd dispersity of Pd/c catalyst is low, microcrystal content is low, thermal stability is weak, and conversion rate of p-carboxyl benzaldehyde raw material is low . In the invention, palladium loaded on carrier active carbon is in microcrystal form, wherein the microcrystal less than 2.5 nanometer accounts for 90wt% of the total weight of the microcrystal palladium, and solution used for dipping or spraying the active carbon carrier contains Pd compound. In a COOH(CH2)nCOOH additive and a BCH3(CH2)m(CH3)3NBr additive, n is an integer ranging from 0 to 3 and m is an integer ranging from 8 to 20, wherein, the technical proposal that m is an integer ranging from 8 to 20 well solves the problems. The invention can be applied to the industrial production of terephthalic acid hydrobon catalyst.

The invention discloses a method for preparing basic copper chloride. The method comprises the following steps: 1, dividing an electrolytic tank into an anode area internally provided with an anode electrode and a cathode area internally provided with a cathode electrode by an ionic membrane, adding an aqueous sodium chloride solution as an anode electrolyte into the anode area, adding a water-containing cathode electrolyte into the cathode area, and carrying out an electrolytic reaction, wherein a water electrolysis reaction occurs on the anode electrode in the electrolytic tank; 2, reacting a product obtained in the anode area through the electrolytic reaction with copper and/or copper oxide; and 3, mixing an electrolytic product in the cathode area in step 1 with a reaction product in step 2 until the pH value is 3-7 in order to obtain a solid and liquid mixture, and carrying out solid-liquid separation on the solid and liquid mixture to obtain the basic copper chloride solid. The method has the advantages of simple process and low production cost.

The invention provides an MVR sewage treatment system utilizing solar energy and belongs to the technical field of energy conservation and environmental protection. A two-stage preheating/cooling modeis realized by adopting a separation subsystem and a waste heat recovery subsystem; in combination with solar subsystem preheating, and steam compression recycling in a concentration and drying subsystem, waste heat is maximally recycled, so that the cost is effectively reduced. The concentration and drying subsystem realizes the effective separation of a sewage solid, purified water and waste gas and gives full play to the advantages of a heating distillation mode for sewage treatment. According to different saturated steam pressures and temperatures, by adopting stepped utilization, the consumption of external steam is reduced by adopting stepped utilization, and the stable and continuous operation of the two sets of MVR systems is ensured. The MVR sewage treatment system has the advantages of being simple in structure, easy to realize and lower investment and operation cost, is extremely significant in energy-saving and environmentally-friendly effects and can be applied to the treatment of all kinds of sewage and sludge as well as the other fields with similar processes, such as food, feed, chemical industry, pharmacy and the like.

The invention provides a preparation method of 1-(2,4-dichlorophenyl)-4-difluoromethyl-3-methyl-1H-1,2,4-triazole-5-one. The method comprises the steps: taking aniline as a raw material; reducing witha catalyst X to prepare phenylhydrazine; under the action of acetaldehyde and sodium cyanate, carrying out cyclization on phenylhydrazine to generate 1-phenyl-3-methyl-1H-1,2,4-triazole-5-one; carrying out a reaction on 1-phenyl-3-methyl-1H-1,2,4-triazole-5-one and monochlorodifluoromethane under the action of a catalyst Y to generate 1-phenyl-3-methyl-4-difluoromethyl-1H-1,2,4-triazole-5-one, and carrying out catalytic chlorination through a catalyst Z to prepare 1-(2,4-dichlorophenyl)-4-difluoromethyl-3-methyl-1H-1,2,4-triazole-5-one.

The invention discloses a preparation method of a chrome tanning solution and relates to the technical field of environmental protection. According to the preparation method of the chrome tanning solution, reducing agents such as sodium pyrosulfite, sodium hydrogen sulfite, sodium thiosulfate and the like are reasonably selected for use, high-toxicity sexivalent chromium ions which are not prone to settling separation in chrome mordanting liquid waste are reduced into trivalent chromic ions with lower toxicity under the acidic condition, and the chrome mordanting liquid waste can be environmentally treated simply and effectively; further, the chrome mordanting liquid waste structure obtained after reduction is adjusted by sulfuric acid, formic acid, acetic acid, sodium carbonate and the like, so that the chrome tanning solution with good masking performance and acid and alkali resistant stability is prepared from the chrome mordanting liquid waste, resourceful treatment of the chrome mordanting liquid waste is realized, environmental pollution caused by toxicity of the chrome mordanting liquid waste is reduced, and the preparation method meets the time requirement of sustainable development.

The invention discloses a comprehensive collection and treatment device and method for kitchen waste, domestic sewage and medical wastewater. The comprehensive collection and treatment device comprises a collection assembly, a conveying assembly and a treatment assembly. The collection assembly comprises a collecting box and a collecting pipeline, wherein the collecting pipeline is used for discharging kitchen waste, domestic sewage and medical wastewater into the collecting box; the conveying assembly is connected with the collecting box and the treatment assembly and used for conveying the kitchen waste, the domestic sewage and the medical wastewater collected by the collecting box to the treatment assembly; and the treatment assembly is used for conducting electrochemical treatment on the kitchen waste, the domestic sewage and the medical wastewater conveyed by the conveying assembly and discharging the kitchen waste, the domestic sewage and the medical wastewater. The working efficiency of a ship sewage treatment system is improved, the size and the capacity of the ship sewage treatment system are reduced, and manufacturing cost is reduced. In addition, the invention further discloses a method based on the comprehensive collection and integrated treatment device for the kitchen waste, the domestic sewage and the medical wastewater. The method has the advantages of simple system structure, safety, reliability and high treatment efficiency.