42results about How to "Improve recovery yield" patented technology

Apparatus and process for recovering elemental sulfur from a H₂S-containing waste gas stream are disclosed. The apparatus preferably comprises a first reaction zone for carrying out the catalytic partial oxidation of H₂S, a second reaction zone for the catalytic partial reduction of any incidental SO₂ produced in the first reaction zone, and a cooling zone including a sulfur condenser. According to a preferred embodiment of the process, a mixture of H₂S and O₂ contacts a catalyst in the first reaction zone very briefly (i.e, less than about 200 milliseconds) producing primarily S⁰ and H₂O. Some SO₂ is also present in the first stage product gas mixture. A reductant gas (e.g. CO, or CH₄ or natural gas) is fed together with the first stage product gas mixture to a second catalytic reaction zone where the partial reduction of the SO₂ component to elemental sulfur and CO₂ is carried out.

The invention provides a recycling method of mother liquor purifying, refining and crystallizing mother liquor of dodecanedioic acid, and belongs to the separation treatment method of non-acyclic dicarboxylic acid containing 12 carbon atoms. The recycling method comprises the steps of (1) recovering a solvent which is methanol; (2) distilling to dissolve and dilute materials residual at the bottom of a kettle; (3) performing acidification under a high temperature, and crystallizing; (4) drying. The recycling method of mother liquor purifying, refining and crystallizing mother liquor of dodecanedioic acid has the advantages that the recovered dodecanedioic acid product has a good color and luster and is of high purity, and moreover, the recovery yield is raised, the device investment is saved, the operation is simple and convenient, the resource can be saved, and the environment is protected; the recovery yield of the dodecanedioic acid product is not less than 97.0%; the product quality meets the technical indexes that the total acid is not less than 99.7wt% (percentage by weight), single acid is not less than 99.3wt%, ash content is not greater than 0.003wt%, the total nitrogen is not greater than 0.004wt%, ferric oxide is not greater than 0.0002wt%, and water content is not greater than 0.17wt%.

The invention discloses a recycling method of long carbon chain binary acid purification and refining crystallization mother liquor, and belongs to a separation treatment method of acyclic dicarboxylic acid with 12 carbon atoms. The method comprises the following operation steps: (1) recovering solvent methanol; (2) dissolving and diluting a residual material at the bottom of a distillation kettle; (3) performing high-temperature acid-out crystallization; (4) drying. The recycling method of the long carbon chain binary acid purification and refining crystallization mother liquor has the advantages that the recovered long carbon chain binary acid product has good color, high purification and high recovery yield, equipment investment is saved, the operation is easy and convenient, the resource is saved, and environment protection is facilitated. By using the method, the long carbon chain binary acid recovery rate is greater than or equal to 97.0 percent. The product quality reaches the following technical indexes that the total acid is greater than or equal to 99.7 percent by weight, the single acid is greater than or equal to 99.3 percent by weight, the ash content is smaller than or equal to 0.003 percent by weight, the total nitrogen is smaller than or equal to 0.004 percent by weight, the ferric oxide is smaller than or equal to 0.0002 percent by weight, and the moisture is smaller than or equal to 0.17 percent by weight.

The invention provides a method for recovering highly pure potassium chloride from a fluorination reaction byproduct. The method comprises the following steps: 1, preprocessing: carrying out heat treatment on the fluorination reaction byproduct to remove adhered organic matter wastes; 2, dissolving and separating: placing a preprocessed solid mixture in a separation device, introducing liquid ammonia to dissolve potassium fluoride in the preprocessed solid mixture to form a mixed solution, filtering the mixed solution to obtain a filter cake which is crude primary potassium chloride and a filtrate which is a liquid ammonia solution of potassium chloride, squeezing the filtrate, introducing the squeezed filtrate to a pressure reducing chamber, and reducing the pressure to normal pressure to gasify the liquid ammonia in the filtrate in order to obtain a pure potassium fluoride solid; 3, washing: adding a mixed solvent A to the crude primary potassium chloride, washing the crude primary potassium chloride to remove residual trace impurities, and filtering the washed crude primary potassium chloride to obtain crude secondary potassium chloride; and 4, purifying: adding deionized water to the crude secondary potassium chloride, heating the deionized water to dissolve the crude secondary potassium chloride in order to prepare a saturated solution, cooling the saturated solution to room temperature, adding a solvent B to carry out re-crystallization, filtering the obtained solution, washing obtained crystals with the solvent b, and drying the washed crystals to obtain highly pure potassium chloride.

The invention relates to a method and a system for treating and recovering adipic acid ammonium waste liquid and the recovering method comprises the following steps: A. filtering the solid impurities in the waste liquid, B. controlling the temperature of the filtered waste liquid and acidizing the filtered waste liquid, C. decreasing the temperature of the acidulated waste liquid and crystallizing the acidulated waste liquid, D. collecting adipic acid crystal after solid-liquid separation, E. washing to get the adipic acid crystal and collecting the adipic acid crystal after solid-liquid separation. The recovering method and recovering system of the invention have the following advantages: being able to acquire purified adipic acid with standard capacitance; being able to be recycled used in the industries such as an electrolytic capacitor, etc., having a simple and efficient technique and obvious economical benefit and environment protection effect.

The invention discloses an electrochemical reaction system capable of realizing high-efficiency recovery of nitrogen and phosphorus, belonging to the field of water treatment in environmental engineering. The electrochemical reaction system comprises a pretreatment unit, a feeding box, a lift pump, an electrolytic reaction tank, a struvite settling tank and a liquid storage tank. Anode magnesium alloy rods and cathode stainless steel rods are parallel to each other and arranged in a staggered manner and do not contact with each other, and the electrodes are perpendicular to the flow directionof feed liquid; the sum of the length of each anode magnesium alloy rod part located inside the electrolytic reaction tank and the length of one corresponding cathode stainless steel rod part locatedinside the electrolytic reaction tank is greater than the distance between the two side walls of the electrolytic reaction tank, so the flow rate of the feed liquid is reduced due to obstruction of the anode magnesium alloy rods and the cathode stainless steel rods. The electrochemical reaction system of the invention adopts an electrochemical technology to treat phosphorus-and-ammonia-containingwastewater, and the whole system can realize integrated automatic operation and has the advantages of energy conservation, high efficiency, low running cost, simple operation, etc.

The invention provides a method for recycling furan ammonium salt from furan ammonium salt waste liquid. The method comprises the following step: reacting by virtue of furan ammonium salt waste slag liquid in the presence of a solvent and a catalyst, wherein the catalyst is selected from one or more of metal chlorate, metal sulfate, metal nitrate, hydrogen phosphate salt, metal oxide, inorganic acid, organic acid and inorganic base, and metal is selected from one or more of sodium, potassium, calcium, magnesium, aluminum, zinc, iron and cobalt, and the reaction temperature is 50-150 DEG C. According to the method, (Z)-formula furan ammonium salt is directly converted from (E)-formula furan ammonium salt through a one-step method by utilizing the furan ammonium salt waste slag liquid at a specific temperature in a special catalyst system in the presence of the solvent, and finally a thermodynamically stable furan ammonium salt product is obtained. The method includes simple steps and is economic, environmentally friendly and suitable for industrial production, the recycling yield of furan ammonium salt is effectively increased, and meanwhile, the environmental protection pressure of the furan ammonium salt waste liquid is decreased.

The invention relates to an imidacloprid suspension, which is prepared from 1 to 80 weight parts of imidacloprid, 3 to 10 weight parts of dispersant or 5 to 30 parts of penetrating agent, 2 to 6 weight parts of antifreeze, 0.1 to 1.5 weight parts of thickener, 0.1 to 2.8 weight parts of defoaming agent and 5 to 90 weight parts of deionized water. The suspension has high suspension rate, more stable hot storage performance; and in field aphid prevention and control experiment, the dose of imidacloprid is low, and the pest killing effect is remarkable.

The invention discloses a reduction tank assembly with a rotary stirring inner core structure for a vertical reduction furnace. The reduction tank assembly comprises a vertical reduction tank body (1), wherein a mounting frame (2) is arranged at the outer upper end of the reduction tank body (1), a driving motor (3) and a speed reducer (4) are mounted on the mounting frame (2), an output shaft ofthe speed reducer (4) serves as a rotating inner shaft (7), the rotating inner shaft (7) is externally sleeved with a rotating outer shaft (6), the rotating outer shaft (6) stretches into the reduction tank body (1) and is connected with a rotating core shaft (5) through a coupler (8). The reduction tank assembly is reasonable to design and is particularly suitable for stirring materials in the reduction process of a metal magnesium vertical tank reduction furnace. The reduction tank assembly is also suitable for the stirring heating of materials in the reduction procedure of other metal vertical tanks, the heating uniformity of the whole materials can be realized according to the heating requirements, and the materials on an inner layer are effectively reduced, so that the reduction yieldis maximized, and meanwhile, the reduction time is greatly shortened.

The invention provides a method for performing zinc enrichment recovery through a rotary kiln. A preheated input raw material is sent to a kiln tail of a diameter-variable rotary kiln, pulverized coaland oxygen-enriched air are blown into the kiln tail, and roasting reaction is executed for 80-100 minutes; under the action of a kiln head exhaust fan, a flowing direction of smoke generated by theroasting reaction keeps consistent with a moving direction of the input raw material, and the smoke and the raw material both move from the kiln tail to the kiln head; roasted ore is collected, and iron ore concentrate is obtained through ore grinding and magnetic separation; the smoke exhausted by the exhaust fan is collected and purified, a dust collection system is enabled to collect zinc-containing dust, the zinc-containing dust is mixed with the input raw material for pelleting, a mixed input raw material is obtained, the mixed input raw material is sent into the diameter-variable rotarykiln, a roasting working procedure and a zinc-containing dust collection working procedure are executed circularly, and thus, circular enrichment of the zinc is realized; after zinc content in the smoke reaches more than 10%, the zinc-containing dust in the smoke is directly collected, and zinc recovery is executed through an acid leaching technology. The method can effectively improve recovery rate of iron and zinc, prevent ring forming of the rotary kiln and be efficient and energy-saving.

The invention relates to a cutting fluid used for grinding a high-speed tool steel grinding wheel. The cutting fluid comprises following components: 10-20% by weight of mineral oil, 5-10% by weight of animal and vegetable oil, 0.1-1% by weight of antioxygen, 2-5% by weight of an antiwear agent, 1-3% by weight of an antirust agent, 0.2-0.6% by weight of metal powder precipitator, and the balance water. The cutting fluid has good lubricating, cooling, antirust and cleaning effects; and meanwhile the metal powder precipitator is added in the formula to achieve effective softening and precipitating for metal powder, control and collection of the metal powder are convenient, and the recovery yield of the metal powder is greatly improved.

The invention provides a corn starch process water protein recovery technique which comprises the following steps: 1) treating process water, which is generated in the gluten concentration step in a wet-grinding technique for producing corn starch, to obtain a first permeation solution and a first trapped fluid containing rich com gluten meal; 2) filtering the first permeation solution through a hyperfiltration membrane with the molecular weight cut-off of 10-200 kDa under the conditions of 3-4 Bar and 35-45 DEG C to obtain a second permeation solution and a second trapped fluid containing rich soluble proteins; and 3) heating the second trapped fluid at 75-150 DEG C for 0.3 second-31 minutes, coagulating to precipitate a first protein product, separating to obtain a first protein product and a separation liquid, and concentrating and drying the separation liquid to obtain a second protein product. The recovery technique overcomes the defect that the traditional technique only treats the insoluble com gluten meal in the process water generated by the gluten concentration step, can obtain the two protein products, and can enhance the yield of the com gluten meal.

The invention relates to a pesticide insecticidal composition containing spirotetramat and pyridaphenthion, and the insecticidal composition is highly effective for controlling harmful organisms. The pesticide insecticidal composition containing the spirotetramat and the pyridaphenthion contains the active ingredients, namely the spirotetramat and the pyridaphenthion, wherein the weight ratio of the spirotetramat to the pyridaphenthion is 50: 1-1: 50. The active compound combination disclosed by the invention has special systemic property, namely by using the insecticidal composition disclosed by the invention to perform treatment on seeds, the seeds can be protected, and plants obtained after germination can be further protected from being damaged by pests. Therefore, the immediate treatment of crops during seeding or slightly after seeding can be avoided; compared with various independent active compounds, the active compound combination disclosed by the invention has synergistically increased insecticidal activity; the insecticidal activity exceeds the sum of activities of two active compounds during respective application, so that the optimization of the quantity of the used active compounds becomes possible.

The invention provides a display device, which comprises a substrate, a first conductor, a second conductor and a substitute conductor, wherein the first conductor and the second conductor are arranged on the substrate and separated from each other through insulating material. The substitute conductor surrounds an overlapping part mutually spanned by the first conductor and the second conductor, is separated from the first conductor and the second conductor through the insulating material, and overlaps the first conductor and the second conductor respectively.

The invention discloses a method for recovering ilmenite from iron separation tailings. The method comprises the following steps that S1, strong-magnetic tailing discarding is carried out on the iron separation tailings to obtain strong magnetic concentrate and strong magnetic tailings; S2, the obtained strong magnetic concentrate is subjected to closed-circuit ore grinding; S3, the raw materials obtained through ore grinding are reselected to obtain reselected concentrate and reselected tailings; S4, the obtained reselected concentrate is subjected to flotation desulfurization treatment to obtain flotation concentrate and sulfur concentrate; S5, the obtained flotation concentrate is subjected to iron removal to obtain magnetite concentrate and weak magnetic concentrate; and S6, the weak magnetic concentrate is subjected to roughing and scavenging to obtain titanium concentrate. The method can improve the grade of the titanium concentrate, improve the recovery rate of the titanium concentrate, improve the resource utilization rate and reduce environmental pollution.

The invention relates to a preparation method of p-aminoacetanilide, and the method comprises the following steps: (1) adding p-nitroacetanilide, zinc powder, ammonium chloride and water into a reaction kettle, uniformly mixing, heating, and keeping the temperature; (2), cooling, crystallizing and filtering the solution obtained in the step 1; (3) completely dissolving in the solution obtained inthe step (2), cooling, recrystallizing with ethanol, and filtering to obtain a p-aminoacetanilide solution; (4) filtering the p-aminoacetanilide solution obtained in the step (3) at 65-75 DEG C, distilling, cooling, and then filtering to obtain a p-aminoacetanilide crude product; (6) heating and dissolving the p-aminoacetanilide crude product; cooling, filtering and drying in vacuum to obtain a p-aminoacetanilide product, wherein the temperature of the p-nitroacetanilide, the zinc powder, the ammonium chloride and the water added into the reaction kettle is 95-100 DEG C, the heating and heat preservation time in the step (1) is 0.5-1.5 hours, the yield in the step (1) is 95%, the zinc powder and the ammonium chloride are used as reducing agents, the water is used as a solvent to reduce thep-nitroacetanilide, and the p-aminoacetanilide is synthesized.