90results about How to "Reduced corrosion resistance requirements" patented technology

The invention relates to carbon preparation material and sulfuric active carbon based on the modification of coke and a preparation method thereof. The invention adopts the scheme that the preparation method comprises the following steps: dipping the coke in KOG solution for 1 to 24 hours at the temperature of 20 to 100 DEG C, wherein the mass ratio of KOH and the coke is 0.05 to 0.5:1; carrying out heat treatment to the coke after being dipped for 1 to 5 hours under the condition of inert atmosphere and 300 to 700 DEG C; then cooling the coke to the room temperature; and finally preparing the carbon preparation material after the coke is washed and dried. The carbon preparation material prepared can react for 1 to 5 hours under the conditions that the mass ratio of active gas flow rate and the carbon preparation material is 5 to 30:1 L/min/kg and the temperature is 350 to 850 DEG C, so as to prepare the sulfuric active carbon. The invention has the advantages of saved alkali consumption and energy consumption, shortened activating treatment time, high yield, and reduced corrosion resistant requirements of the material; the prepared carbon preparation material has high reaction activation; and the sulfuric active carbon prepared by the carbon preparation material has larger specific surface area and high sulphur content, and exits in a straight chain sulfuric shape as the subject of S2 and S6.

The related recovery and process method for waste secondary Li-ion cell comprises: separating cell shell, circuit board and cell core by mechanical means; discharging the core; then separating to obtain the shell and coiling material of cell core; putting the last one into some organic solvent to separate the cell polar material from collector foil, filtering to obtain the foil and active material for recovery by chemical way. With small investment, this invention is simple and safe and high yield.

The invention provides a preparation method of a gold-based catalyst for preparing vinyl chloride by an acetylene hydrochlorination method and the catalyst prepared by the method. According to the catalyst, an activated carbon is used as a carrier, a complex formed by gold and a nitrogen-containing ligand is a main active component, compared with other gold-based catalysts, green solvents such aswater, ethanol and the like are utilized to replace acidic solvents such as hydrochloric acid, aqua regia and the like in the catalyst preparation process, and the gold in a high valence state is stabilized by the complexation of the nitrogen-containing ligand with the gold, thereby improving the effectiveness of the catalyst. The catalyst has high activity and vinyl chloride selectivity in the reaction of fixed bed acetylene hydrochlorination to prepare the vinyl chloride, the preparation method is green and environmentally friendly, and the method has a great industrial application value.

The invention discloses a method for preparing an aluminum-scandium intermediate alloy by using calciothermy. The method comprises the following steps of: (1) calculating the weights of halides of aluminum, metal calcium and scandium serving as raw materials, or scandium-containing fused salt, anhydrous calcium chloride and alkali chloride required for smelting in each furnace according to the component content of the aluminum-scandium intermediate alloy; (2) after uniformly mixing a flux, adding the flux into a crucible to smelt; (3) when the flux is completely smelted, adding scandium halide and preserving the heat in a closed protective atmosphere; (4) adding aluminum and metal calcium into the smelted scandium-containing fused salt, preserving the heat and thermally reducing for 20 to 200 minutes; (5) after finishing the thermal reduction reaction, slagging off, and adding an excessive amount of refining agent to remove the calcium, when the calcium content in the alloy is less than 50ppm, casting an ingot and cooling, and performing water leaching to remove slag so as to obtain the aluminum-scandium intermediate alloy. The method disclosed by the invention has the advantages of low fluorine, micro discharge, easiness in operation, steady aluminum-scandium alloy product, novelty and economy.

The invention discloses a branched-chain long-chain fatty acid base imidazoline extraction agent and a preparing method and application thereof. The imidazoline extraction agent comprises multiple N atoms and long-branch-chain alkyl groups. The preparing method of the imidazoline extraction agent comprises the steps that in the normal pressure, carboxylic acid and polyethylene polyamine are subjected to the reaction under the action of a solid catalyst, after the reaction is finished, the solid catalyst is recycled through solid-liquid separation, the liquid mixture is distilled, the raw material incompletely reacted is recycled, and then the branched-chain long-chain fatty acid base imidazoline extraction agent is obtained. The preparing method has the beneficial effects that reaction conditions are moderate, the catalyst can be repeatedly used, and equipment investment and operation cost are low; the imidazoline extraction agent is used for extraction negative ions including tungsten, molybdenum and vanadium, the beneficial effects that the extraction volume is high, the phase splitting time is short, and the extraction and reverse extraction performance is excellent; and good industrial application prospects are achieved.

The invention relates to an improvement of a method for preparing dimer acid and dimer acid methyl ester by using unsaturated fatty acid and corresponding fatty acid methyl ester thereof, which is characterized in that a catalyst for reaction is sulfonate ionic liquid which contains SO3H functional groups and accounts for not less than 0.5% in parts by weight, the reaction is carried out at the temperature of 150-300 DEG C, the iodine value of products are controlled to be 65-80%, and the products and the catalyst are stratified by standing after the reaction is complete. The method has the advantages of high polymerization reaction activity, fast reaction speed and relatively mild reaction conditions, and the reaction can be carried out at atmospheric pressure and relatively low temperature, thereby not only reducing the reaction energy consumption and having low requirements on equipment, but also greatly reducing the preparation cost. The catalyst has good stability and small usingquantity, only 0.5% by weight of the catalyst can carry out full reaction, the catalyst is difficult to hydrolyze and easy to realize the phase separation with the products, the catalyst can be separated from the products only through ordinary standing or centrifugation without entrainment of the products, the catalyst can be repeatedly recycled, and the production process is environment-friendly.

The invention relates to a method for preparing hydrolysis crystal seeds by reaction between a titanyl sulfate solution and a Na3PO4 solution. The method comprises the following steps: adding the titanyl sulfate solution at certain temperature into the Na3PO4 solution according to a certain mass ratio, and curing by stirring until the stability of the crystal seeds drops to the specified requirement; and producing the titanium white product for matting agents by the process. The titanium white obtained by hydrolysis has the advantages of excellent whiteness, high water-based dispersing power, favorable matting capacity, low impurity content, moderate particle size, narrow particle size distribution and the like, and is suitable to be used as a matting agent.

The invention provides a seawater desalination method for an integrated membrane process and belongs to a water desalination technology. Aiming at the defects of high investment, high pressure, high energy consumption and the like in an existing membrane-method seawater desalination process, 'nanofiltration/electrodialysis reversal' is taken as a core desalination process, wherein during nanofiltration, a high-desalination nanofiltration membrane with desalination ratio of 90% is adopted; during electrodialysis reversal, a thin-type electrode chamber is filled with a multistage multi-section energy-saving electroosmosis device provided with mixed-bed ion exchange resin. Seawater raw water is sequentially pretreated by virtue of a coagulative precipitation tank, a settling tank, a sand filter and an ultrafiltration membrane, and then is subjected to graded desaltination sequentially by virtue of a nanofiltration desalination device with an energy recovery device, and an energy-saving frequent electrodialysis reversal device; nanofiltration and energy-saving electrodialysis are respectively performed at low operation pressures which do not exceed 3.8MPa and 0.4MPa; the salt content of water produced by the system is 80-250mg/L, the total desalinization ratio can be mechanically regulated within a range of 99-99.75%, the body power consumption of per ton of water does not exceed 2.15KWh/m<3>, the investment and energy consumption of the whole seawater desalination process are obviously reduced, and the process operation is relatively safe and stable.

The invention relates to a method for treating industrial mixed waste salt by using sulfuric acid, the industrial mixed waste salt refers to industrial waste salt containing sodium chloride and sodium sulfate, and the method comprises the following steps: (1) adding a sulfuric acid aqueous solution with the concentration of more than 20% and the industrial mixed waste salt into a reactor, controlling the temperature to be 65-120 DEG C, reacting for 0.5-1.5 hours, and collecting volatile gas to obtain a byproduct hydrochloric acid; controlling the acidity of the obtained reaction liquid to be 55-85%, then cooling and crystallizing the reaction liquid, and separating to obtain sodium hydrogen sulfate crystals and acidic mother liquor; (2) mixing the sodium hydrogen sulfate crystal with industrial mixed waste salt, reacting at 450-600 DEG C for 3.0-6.0 hours to obtain crude sodium sulfate and hydrogen chloride-containing tail gas, and using the hydrogen chloride-containing tail gas for preparing byproduct hydrochloric acid; and (3) carrying out salt dissolving refining on the crude sodium sulfate, concentrating and crystallizing the refined solution, and separating to obtain the sodium sulfate product. The practical problem that industrial mixed waste salt is difficult to treat is solved, and the industrial anhydrous sodium sulfate and the byproduct hydrochloric acid which meet the quality requirements of national standard I-class first-grade products are prepared.

The invention provides a method of preparing ferric sulfate, which has the procedures that: iron ore is ground into iron powdered ore which is calcined for 2-3 h under the condition of 750-900 DEG C for the spare after being cooled; industrial sulphuric acid solution with 36-40 percent of mass percent concentration is added into a container provided with a mixing device; the iron ore is weighted and added into the industrial sulphuric acid solution for mixing; wherein, the mass percent of the iron ore and the industrial sulphuric acid solution satisfies the need of 1:6; the mixed solution of the iron ore and the industrial sulphuric acid solution is reacted for 2-3 h under the constant temperature of 100 DEG C, and then the ferric sulfate solution can be obtained after being cooled and filtered. The method adopts the iron ore with low cost to be used as the raw material, the iron ore is mixed and reacted with the industrial sulphuric acid solution after being calcined, not only the production process and the operation condition are easily controlled, but also the leaching rate of iron is higher. A feasible path can be provided for the multipurpose use of the iron ore, and a process route with low-cost raw material is provided for producing flocculating agent.

The invention relates to the field of flue gas desulfurization equipment for medium and small coal-fired boilers, and in particular discloses a double-alkali flue gas desulfurization oxidation tank. The double-alkali flue gas desulfurization oxidation tank comprises an aeration region and a settling region which are arranged vertically. The oxidation tank is characterized in that: an oxidation air main pipe and a plurality of primary branched pipes which are uniformly distributed and communicated with the oxidation air main pipe are arranged above the liquid level of the oxidation tank, the primary branched pipes are connected with secondary branched pipes which are uniformly distributed in the aeration region, the secondary branched pipes are connected through flanges, an aerator is arranged at the tail end of each secondary branched pipe, each aerator is a cross porous pipe, a reflecting plate is arranged on the upper part of each aerator, and a flat straight oar type stirrer is arranged in the settling region. The oxidation tank is unique in structure; and through the oxidation tank, air is distributed uniformly, the gas-liquid contact area is enlarged, and the oxidation efficiency is remarkably improved.

The invention provides a multi-order screw extrusion type polyolefin halogenation equipment and a polyolefin halogenation method, and belongs to the field of chemical equipment. The multi-order screw extrusion type polyolefin halogenation equipment comprises N-order extruders connected in series, every two adjacent extruders are connected through a single screw or a screw pump in a closed mode; the inlet end of a machine barrel of each single screw or each screw pump is connected to the extruder head of a last-order extruder, and the outlet end of the machine barrel of each single screw or each screw pump is connected to the extruder tail of a next-order extruder; the screws of the N-order extruders are formed by connecting building block type composite structures in series; a feed port is formed in a first-order extruder; and air inlets and air outlets are formed in the other-order extruders.

The invention discloses a method for recycling dusty waste gas. The method for recycling the dusty waste gas is characterized by comprising the following steps: firstly introducing the dusty waste gas into a gas-solid separation device, separating dust from gas in the dusty waste gas by using the gas-solid separation device, and collecting the dust; and subsequently introducing the waste gas discharged by the gas-solid separation device into a gas absorbing device, and absorbing the gas in the dusty waste gas through the gas absorbing device. The method for recycling the dusty waste gas is simple and reliable in process; by separating the dust and the gas in the dusty waste gas and then independently recycling the dust and the gas, the corrosion of the device can be reduced, so that the anti-corrosion requirement on the device and the maintenance times of the device can be reduced, and the production cost can be saved.

The invention discloses a method used for preparing ammonia gas from an ammonium salt and a silicate. The preparation method comprises following steps: an ammonium salt aqueous solution is contacted with a high temperature silicate solid granule bed layer in the form of droplets, reaction is carried out on the surfaces of silicate solid granules to generate ammonia gas and a solid substance, the generated ammonia gas is collected, the solid substance is discharged, a part of the solid substrate is mixed with fresh silicate solid granules, and is subjected to reaction with the droplets of the ammonium salt solution. According to the method used for preparing ammonia gas from an ammonium salt and a silicate, ammonia gas can be produced only through one-step reaction in a preparation device,reaction steps are simplified, operation difficulty is reduced, and it is convenient for industrialized amplify production.