162results about How to "Improve dechlorination effect" patented technology

The invention relates to a method for circularly removing chlorine in a zinc sulphate solution by copper slag. The method comprises the following steps: copper ions, zinc powders and a zinc sulphate solution are added into a continuous reaction groove and react in a stirring state to obtain the zinc sulphate solution containing Cl<-> equal to or less than0.3g/l, and a CuCl precipitate generated in the reaction enters slag; a mixture of the zinc sulphate solution and the slag are treated by liquid-solid separation to obtain a dechlorinated zinc sulphate solution and copper slag; the separated copper slag is washed with alkali to remove chlorine ions; the copper slag after being washed with the alkali is returned to the continuous reaction groove for carrying out a circular reaction; and when the copper ions are deficient, a certain copper sulfate is added at proper time for replenishment. The invention utilizes the zinc powders as a reducer for reacting with the copper ions in the zinc sulphate solution to generate a CuCl copper slag precipitate, Cl<-> is eluted with the alkali, Cu2O is also obtained and is returned to react with the Cl<-> in the solution for circular dechlorination, copper sulfate does not need to be added or a little copper sulfate is only added in the dechlorination process, the consumption of raw materials is little, and the cost is low; compared with a method that the copper slag which can be changed is added continuously, the interference of external factors to a dechlorination technique is little, the process is easy to control, and the dechlorination effect is stable and reliable.

The invention discloses a method for chlorine from solution of zinc sulfate, which mainly comprises the following: 1, a step of extraction, in which tributylamine is used as an extractant, kerosene or para-octanol is used as diluent, clear liquid of zinc sulfate is mixed with an organic phase for extraction, and chlorine in a water phase is transferred to an organic phase; 2, a step of back extraction, in which back extraction is performed by using ammonia water or solution of sodium hydroxide, chlorine in the organic phase is retransferred to the water phase, and the organic phase is recycled; 3, a step of organic phase regeneration, in which 5 to 10 percent solution of sodium hydroxide is mixed with the organic phase which ages after being used for a certain period of time in a ratio of 1:0.9 to 1:2.5, and the mixture is stirred by an electromagnetic siterr at a high speed for 8 to 15 minutes for regenerating the organic phase; and 4, a step of deoiling, in which raffinate is subjected to active carbon absorption or ultrasonic demulsification so as to remove the organic phase in the raffinate. In the invention, the organic phase and the raffinate can be used circularly, the dechlorination rate is over 85 percent, the electrolytic operation environment is improved, the process flow is simple, and the method can be used for dechlorinating solution of zinc sulfate from wet-method zinc smelting plants and can also be used for dechlorinating wastewater.

A filtering material for removing the harmful substance from running water is proportionally prepared from activated carbon, KDFT, calcium sulfite, zeolite molecular sieve, and Ag carried phosphate. Its filter apparatus is a multi-layer hollow structure composed of internal non-woven fabric layer, activated carbon mixed core layer, external non-woven fabric layer and plastic mesh layer. Its manufacture method features that its both ends are blocked by polyethene covers and its core layer is prepared from multiple substances through mixing and screw extruding out to become a hollow cylinder.

The invention relates to a method for removing chlorine in manganese electrolyte or zinc electrolyte. The method comprises the steps of: adding a certain quantity of bismuth (III)-containing antichlor into chloridion-containing manganese electrolyte or chloridion-containing zinc electrolyte by means of continuous stirring; adjusting the pH value of the solution at 1.0-5.0, so that the trivalent bismuth ions are hydrolyzed to generate insoluble bismuth oxychloride precipitate on the premise of chloridion; filtering, wherein the filter liquor is used for the follow-up electrolysis production technology; and regenerating filter residue bismuth oxychloride precipitate by an alkaline solution to generate bismuth hydroxide for recycling, and timely adding a small quantity of antichlor in the process of recycling to compensate the loss in the process of regeneration.

The invention relates to a method for dechlorinating gas discharged from a continuous reforming regenerator, comprising the following steps: absorbing chloride in gas discharged from a coke-burning zone and an oxychlorination zone of the continuous reforming regenerator through a bed for catalyst to be regenerated and a bed for solid dechlorinating agent, wherein the bed for catalyst to be regenerated and the bed for solid dechlorinating agent are arranged between a gas-solid separator and a regenerator in sequence; eliminating one part of gas discharged from the bed for catalyst to be regenerated from a system, and returning the other part of the gas to the coke-burning zone of the continuous reforming regenerator; enabling gas discharged from a roasting zone of the continuous reforming regenerator to enter another dechlorinating pot filled with solid dechlorinating agent to absorb chloride therein and eliminating the gas from the system, wherein the solid dechlorinating agent comprises 50-88 percent of alkaline earth oxide by weight, 10-40 percent of alumina by weight and 2-30 percent of bentonite by weight. With the method for dechlorinating gas discharged from a continuous reforming regenerator, the gas discharged from the continuous reforming regenerator can be dechlorinated, and agent to be regenerated can absorb a certain amount of chlorine to reduce the amount of chlorine injected in the regeneration process.

The invention provides an adsorbent loaded with alkali active components, a preparation method of the adsorbent loaded with alkali active components and a deep dechlorination method. In percentage byweight, per 100% of the adsorbent loaded with alkali active components comprise 30-70% of molecular sieve, 10-50% of active alumina and the balance of alkali active metal components. The preparation method of the adsorbent loaded with alkali active components comprises the following steps of mixing the molecular sieve, an adhesive-bonding agent and a pore-forming agent, molding the mixture by performing kneading, and carrying out drying and calcining so as to obtain an adsorbent carrier; immersing the adsorbent carrier in an aqueous solution of alkali active metal components, and carrying outfiltering, drying and calcining so as to obtain the adsorbent loaded with alkali active components. Being applied during dechlorination process of ionic liquid alkylated oil adopting fixed bed technology, the adsorbent loaded with alkali active components provided by the invention shows excellent dechlorination effects; moreover, regeneration process of the adsorbent is simple, effective, low in energy consumption and free of hydrogen. Ionic liquid alkylated oil underwent dechlorination according to the process can be directly used as gasoline-blending oil.

The invention provides an antichlor used for purifying reforming regeneration gas. The antichlor is prepared from, by mass, 85-90wt% of a composite oxide carrier and 10-15wt% of alkaline earth metal oxide. The composite oxide carrier is a mixture formed by Al2O3, SiO2 and ZrO2 at the mass ratio of 80:(80-100):(1-3), the specific surface area of the composite oxide carrier is 310-340 m<2>/g, and the total acid content is 0.31-0.45 mmol/g. According to the antichlor, composite oxide with a specific composition is adopted as the carrier, the total acid content of the carrier can be easily controlled within a proper range so that the bonding force between metal active components and the carrier can be regulated and controlled to be moderate, accordingly, it is guaranteed that the antichlor has both high chlorine capacity and high anti-hardening capability, and thus the antichlor has broad industrialized application prospects.

The invention discloses a preparation method of a core-shell Fe/Pd bimetallic nano-catalyst. In the preparation method, glassy carbon electrodes are used as working electrodes, nano-Fe is firstly deposited on the electrodes by an electrochemical deposition method, then the nano-Fe is dipped into a certain quantity of palladium chloride ion solutions for appropriate time so that the noble metal ions and the nano-Fe are partially replaced, and then residual liquid on the surfaces of the electrodes is washed out. The method has simple steps and is easily operated and can conveniently control theload and the appearance of the Fe deposited on the surfaces of the glassy carbon electrodes by controlling the growth time of finished core-core and the concentration of Fe ions in deposit liquid. Theprepared core-shell Fe/Pd bimetallic nano-catalyst has high catalytic activity and favorable effect on dechlorination for contaminants such as organic chloro compounds, and the like.

The invention belongs to the technical field of waste water and waste liquid treatment and recycling, and particularly relates to a chlorine removal agent, and a method and an application for removing chlorine from waste acid wastewater by using same. The method comprises the following steps: firstly, heating the acid wastewater to a certain temperature, then adding a proper amount of a dechlorinating agent, continuously heating and stirring the system for a certain time to efficiently remove chloride ions in the waste acid wastewater, and absorbing chlorine generated in the reaction process by using alkali liquor. The reaction principle is different from that of the prior art: chlorine ions in the contaminated acid wastewater are oxidized into chlorine by means of the principle of oxidation reduction and the high oxidation potential of a chlorine removal agent or an intermediate product in the reaction process, and the chlorine is volatilized due to the fact that the chlorine is not dissolved in an acidic solution. The concentration of chloride ions in the waste acid wastewater treated by the method is lower than 20 mg/L, so that the concentration of chloride ions in the waste acid wastewater meets the recycling requirement. The method not only solves the problem of removal of chloride ions in the acid wastewater, but also has low requirements on equipment, and realizes resource recovery of chlorine in the wastewater.

The invention relates to the technology of preparation of catalytic materials, and aims to provide a preparation method of a Cu/Pd alloy modified TiO2 catalyst for reductive dechlorination materials. The method comprises the following steps: preparing a nano-sheet-like TiO2 catalyst by using tetrabutyl titanate as a titanium precursor and utilizing corrosion performance of HF(hydrogen fluoride) through hydrothermal reaction; preparing a Cu/Pd alloy co-modified TiO2 catalyst through an immersion-reducing atmosphere calcination method. Complex Cu and Pd salt solutions and the catalyst are mixed and immersed, and after vacuum drying, calcination under a hydrogen reducing atmosphere is carried out. According to the preparation method disclosed by the invention, visible light response of the catalyst is realized, and high-efficient reductive hydrogenation dechlorination in aqueous solutions under visible light can be carried out by utilizing a synergistic effect of Cu/Pd alloys, and a catalytic dechlorination effect of the catalyst is superior to that of a commercialized P25/Pd individually-loaded TiO2 catalyst. By the formation of the Cu/Pd alloys, the catalyst has the advantages that the using amount of precious metals is reduced while the good dechlorination effect is achieved, and practical application of reductive dechlorination under visible light is facilitated.

The invention belongs to the field of chemical industry, and particularly relates to a dechlorination method for chlorine-containing plastic. The method comprises the following steps: a), performing a pyrolysis reaction on an alkaline matter and the chlorine-containing plastic, so as to obtain chlorine salt and hydrocarbon, wherein the alkaline matter comprises one or more of ferriferous oxide, alkali metal oxide, alkali metal hydrate, alkali-earth metal oxide and alkali-earth metal hydrate, and the chlorine-containing plastic comprises polyvinyl chloride. During a pyrolysis process of the chlorine-containing plastic, the specific alkaline matter is added, so that chlorine elements in the chlorine-containing plastic produce non-gaseous chlorine salt, and gaseous chlorine hydride and secondary pollution to atmospheric environment are not produced on the premise of ensuring smooth dechlorination of the chlorine-containing plastic. Experimental results indicate that when the method provided by the invention is adopted to perform dechlorination on the chlorine-containing plastic, the chlorine elements in the plastic are nearly completely fixed to the chlorine salt.

The invention discloses an organic chloride removing method for waste cooking oil. The organic chloride removing method aims at eliminating the harm of organic chloride to subsequent processing equipment and comprises the steps that at least one stage of electric desalting is conducted on the waste cooking oil; then 6-15% by weight of water is added into the waste cooking oil subjected to electric desalting to be mixed with the oil, and a dechlorination agent is added to perform dechlorination reaction, wherein the dechlorination reaction conditions are described as: the reaction temperature is 90-150 DEG C, the reaction time is 45-120 minutes, the stirring rate is 100-600 r/min, and the agent-chlorine mass ratio is 2-20:1 generally; a reaction product obtained after dechlorination reaction is subjected to electric desalting again to obtain organic chlorine removed cooking oil. The organic chloride in waste cooking oil can be efficiently removed by using the method at low cost.

The invention relates to a method for zinc raw material dechlorination in zinc hydrometallurgy. The method comprises the following steps: 1, ball-grinding: ball-grinding raw materials into a slurry with a particle size of less than 80 meshes; 2, washing: adding water to the slurry, washing, filtering, allowing a filtrate to enter into a zinc precipitation process, and allowing a filter residue toenter into a neutral leaching process; 3, precipitating zinc: adding a zinc precipitant to the filtrate obtained in step 2, precipitating zinc, filtering, allowing a filtrate to enter into a waste water processing process, and allowing a filter residue to enter into a neutral leaching process; 4, carrying out neutral leaching: adding an electrolytic waste liquid and sulfuric acid to the filter residue obtained in the step 2, adding the zinc precipitation filter residue obtained in step 3, stirring, filtering, allowing a filtrate to enter into an advanced dechlorination process, and sending a filter residue to an environmental protection processing station; 5, carrying out advanced dechlorination: adding a cooper residue dechlorination agent and sulfuric acid to the filtrate obtained in step 4, reacting, filtering, allowing a filtrate to enter into a zinc hydrometallurgy process, and selling a filter residue outside; and 6, processing waste water: carrying out environmental processing on the filtrate obtained in the step 3, and discharging when standards are reached. The method has the characteristics of good dechlorination effect, low cost, strong operability, substantial economicbenefit and the like.

The invention discloses a quaternary ammonium salt modified Pd/C electrocatalyst as well as an electrode and preparation and application thereof. The electrocatalyst comprises carbon dust and Pd nanoparticles, wherein the Pd nanoparticles are supported by the carbon dust to form a nano Pd/C composite material; and quaternary ammonium salt is adhered to the surface of the nano Pd/C composite material. The quaternary ammonium salt is adopted to modify Pd/C, by virtue of the electropositivity and the complexing effect (with pollutants) of the quaternary ammonium salt, the electrostatic repulsiveinteraction of chlorine-containing pollutants with cathode electrodes can be alleviated, adsorption of the chlorine-containing pollutants can be enhanced, and dechloridation efficiency can be improved.

The invention discloses a method for electrocatalytic dechlorination of p-chloronitrobenzene, which comprises the following steps: adopting an impregnation method to load noble metal palladium on a foamed nickel material with a three-dimensional structure as the cathode of an electrocatalytic reactor; The waste water of base benzene is passed into the electrocatalytic reactor, and the whole reactor is filled, and the electrochemical treatment starts under constant current, and the reduction reaction of p-chloronitrobenzene occurs in the cathode chamber, and it is first reduced to p-Chloroaniline, and then undergoes dechlorination to form aniline due to the superior performance of the palladium-containing nickel foam electrode. The present invention replaces metal reduction with electrocatalytic reduction, which avoids the problems of easy passivation of metals and low mass transfer efficiency, and overcomes the difficult problem that traditional electrodes are difficult to dechlorinate p-chloronitrobenzene. Take off effectively.

The invention provides a gaseous phase dechlorinating agent. The gaseous phase dechlorinating agent is prepared from the following components in percentage by weight: 15 to 30 weight percent of calcium carbonate, 10 to 35 weight percent of magnesium carbonate, 7.2 to 10.8 weight percent of calcium oxide and 48 to 65 weight percent of aluminate cement. According to the dechlorinating agent provided by the invention, by using the characteristic that the calcium carbonate and the magnesium carbonate are used to generate a regular sandwich structure, chlorine is adsorbed more favorably, the dechlorinating activity is improved, and the breakthrough chlorine content of the dechlorinating agent at 300DEG C is as high as 55 percent; in addition, the strength can be improved, and the side pressure strength of the dechlorinating agent when clay is not used is as high as 110N/cm, so that the clay is prevented from being used and further the sintering of the dechlorinating agent is effectively prevented; meanwhile, by using high hygroscopicity of calcium oxide, the calcium oxide absorbs water and is converted into calcium hydroxide with higher alkalinity, so that the absorbing ability for hydrogen chloride is promoted, the dechlorinating precision is improved, the desorption of chlorine from the dechlorinating agent is hindered, the condition that water and metal chloride generated by chlorine absorption of the dechlorinating agent generate a coordination reaction is prevented, the damage to a dechlorinating agent structure and the blockage of an internal pore canal are avoided, and the chlorine capacity of the dechlorinating agent is effectively improved.

The invention discloses a technological method of removing hydrogen chloride through powder injection of a blast furnace gas pipeline and a device of removing hydrogen chloride through powder injection of the blast furnace gas pipeline. The device utilizing the technology of adopting blast furnace gas pipeline powder injection to remove hydrogen chloride adopts the dry type blast furnace gas injecting dechloridation technology to remove hydrogen chloride; a dechlorination agent bag-type dust collector hopper, a pulverizer and a draught fan are sequentially mounted on a pipeline behind a dry process coarse dust remover and in front of the bag-type dust collector of the existing device; and the condition of blast furnace gas in an outlet pipeline of the dry process coarse dust remover is set; through grinding, the dechlorination agent obtains a larger specific surface area, and the ground dechlorination agent is directly injected in the blast furnace gas pipeline for dechloridation reaction through the powder injection manner. With adoption of the technical scheme, the one-time investment is less, the occupied area is small, and the system is simple in operation and convenient to maintain. The technology can effectively improve the contact uniformity and sufficiency of the dechlorination agent and blast furnace gas, improves the dry process dechlorination effect, is low in heat loss of blast furnace gas and does not affect later application of TRT.

The invention discloses a treatment method and system for washing and dechlorinating waste incineration fly ash and evaporating, grading and crystallizing washing liquid. The method comprises the following steps: pulping the waste incineration fly ash, and performing multi-stage elution to obtain washed fly ash and washing liquid; purifying the water washing liquid to obtain clear liquid and precipitated slurry; adjusting the pH value of the clear liquid to obtain an evaporation raw material liquid, and sequentially carrying out preheating, falling film heat exchange, forced circulation heat exchange, evaporative crystallization treatment, sodium chloride crystallization separation, nanofiltration membrane treatment and potassium chloride crystallization separation to obtain potassium chloride and sodium chloride products; and obtaining sludge and clear liquid through desliming treatment of the sediment slurry, and obtaining fly ash through drying the sludge and the washed fly ash. The multi-stage countercurrent and alkaline water washing technology is adopted, water consumption is low, raised dust is avoided, the dechlorination effect is good, and the heavy metal leaching rate is low; divalent ions in feed liquid are intercepted by adopting a and nanofiltration membrane treatment technology, so that the quality of crystalline salt is effectively improved, long-term stable operation of the system can be ensured, and cyclic utilization and zero emission of process water are realized while the consumption of clear water is reduced.

The invention discloses a Pd/MnO2-Ni electrode as well as a preparation method and application thereof. The Pd/MnO2-Ni electrode takes porous foamed nickel as an electrode substrate, and MnO2 and Pd nanoparticles are loaded on the porous foamed nickel. According to the Pd/MnO2-Ni electrode, the use amount of Pd is reduced while the catalytic efficiency is improved, compared with a traditional Pd/Celectrode and a Ni/Pd electrode, the Pd/MnO2-Ni electrode has obviously improved activity and remarkably improved dechlorination effect.

A dechlorinating agent for blast furnace top gas prepared by the steps of: Selecting industrial limestone, commercial sodium carbonate and potassium hydroxide; Soaking the raw industrial limestone in a potassium hydroxide solution, wherein the concentration of the potassium hydroxide solution is 10%-15%; Heating the soaked limestone at 700° C. for calcination; Grinding the light-burned limestone obtained by calcining the limestone and sodium carbonate until the particle size is below 20 μm; Mixing the light-burned limestone and the sodium carbonate at a proportion of 30-70:70-30 for 10-15 min; Grinding the resultant mixture by milling process until the particle sizes of all powders are less than 80 μm; Adding 3% bentonite in the prepared mixing powder and fully mix the mixture; Pelletizing the mixture with atomized water using a disc pelletizer; and selecting pellets of 3-10 mm in size; Drying the said pellet naturally or at a temperature below 100° C.