101results about How to "Reduce the amount of acid" patented technology

A method for recovering MnO2 from the anode material of a wasted lithium manganate oxide battery comprises the following steps of firstly obtaining an anode active material by pre-disposing assembled anode sheets with alkaline solution, etc., subsequently taking the anode active material as a raw material and obtaining a Lambda-MnO2 by soaking the raw material in an inorganic acid or a normal-pressure acid, or obtaining an Alpha-/Beta-/Gama-MnO2 by soaking the raw material in a hydrothermal acid. The method has simple process, little used acid and convenient separation and purification; the obtained various crystal-type MnO2 with large specific surface area and porous structure can be applied directly to be as a catalyst for synthesizing ester compound or disposable battery anode material of Li/MnO2 or electrode material of a super-capacitor.

The invention relates to a method for removing heavy metal from sludge. The method comprises the following steps of: extracting the heavy metal by using citric acid and hydrogen peroxide, performing microwave heating and solid-liquid separation, and adding sodium hydroxide to precipitate the heavy metal. The method is simple in process, the removal rate of the heavy metal is high, and consumption of acid is low; the citric acid solution can be recycled; the method is low in cost and does not harm the environment; and by adding the hydrogen peroxide into the extract, the extraction rate is improved, the reaction is quickened, and loss of available chemical elements such as N and P is reduced.

The invention provides a post-treatment method for 4,6-dihydroxypyrimidine synthesis, belongs to the technical field of organic chemical industry, and relates to a method for alkali recovery and application and wastewater recovery and application in a chemical industry product, particularly to a process. According to the process, formamide, dimethyl malonate and sodium methoxide are adopted as starting raw materials and cyclization is performed to prepare 4,6-dihydroxypyrimidine; after the reaction is completed, negative pressure suction filtration is performed, the filtrate is subjected to partial methanol removing, and the alkali is recovered and applied; and after the filter cake is subjected to acidification crystallization, negative pressure suction filtration is performed, the filter cake is dried to obtain the product, the mother liquor is concentrated to recover the 4,6-dihydroxypyrimidine, and the acid water is neutralized so as to be recycled while the by-product salt can be recovered so as to be comprehensively utilized. According to the present invention, after the alkali recovery and application, the acid consumption for the subsequent acidification treatment can be significantly reduced so as to substantially reduce the production cost and the three-waste amount; and the post-treatment method has characteristics of less equipment investment, three-waste treatment cost reducing, easy raw material recovery and application, and the like, and is suitable for industrial production.

The invention discloses a novel method for eliminating waste water discharge during furfural production which comprises, collecting waste liquid exhaust on the distillation tower bottom during furfural production, introducing the waste liquid into a heat exchange pool as cooling liquid, wherein the condensed furfural gas is located in the condensation pipe, heating and condensating the tower bottom waste liquid and charging into the acid trough for furfural production. The invention effectively solve the sewage treatment problem in the furfural production process.

The invention discloses a method for preparing ammonium paratungstate by utilizing a low-grade scheelite concentrate, and relates to the technical field of metallurgy chemical industry. The method comprises the following steps of adding a sodium hydroxide solution into the low-grade scheelite concentrate, mechanically grinding, then adopting far-infrared radiation heating for carrying out alkali autoclave treatment, filter pressing the obtained ore pulp through a filter press, and water washing to obtain a sodium tungstate solution; concentrating and crystallizing the sodium tungstate solutionto obtain a sodium tungstate crystal; dissolving the sodium tungstate crystal into water to prepare sodium tungstate pre-fluid for ion exchange; adopting strong-base anion exchange resin for carryingout ion exchange adsorption on the sodium tungstate solution, flushing, and desorbing tungsten by using mixed liquor of ammonium chloride and ammonium hydroxide; adding (NH4)2S into the desorbed solution, vulcanizing, adding a CuSO4 solution for removing molybdenum, filtering, concentrating, crystallizing, and drying to obtain the ammonium paratungstate. The leaching efficiency of scheelite is high, impurity components such as trace metal cation in the solution can be effectively removed, the molybdenum removal rate is high, and the purity of the obtained ammonium paratungstate is high.

Measurement of heavy metals in a water body environment by utilization of flame atomic absorption spectrophotometry is provided. The measurement is characterized by including: collecting a sample to be measured, putting the sample into a digestion tank, adding 5 mL of concentrated hydrochloric acid, 5 mL of hydrofluoric acid and 5 mL of perchloric acid, mixing uniformly, putting the digestion tank into a digester, digesting for 20 min, drying, cooling, transferring the solution into a volumetric flask having a volume of 50 mL, adding to a constant volume, shaking to obtain a uniform solution, filtering into a colorimetric pipe, and comparing with a blank sample and analyzing by utilization of a flame atomic absorption spectrophotometer. Precision and accuracy of measuring zinc, copper, lead, cadmium and chromium in a polluted water body by the measurement of the heavy metals in the water body environment by utilization of the flame atomic absorption spectrophotometry are high. The relative standard deviation is 104-471%. The measurement is simple and convenient in operation, small in acid using amount and capable of reducing pollution, and is a preferred method for measuring heavy metals in polluted water.

The invention relates to a method for extracting gelatin from rabbit skin, which comprises the following steps: rabbit skin pretreatment: removing subcutaneous fat, unhairing, cleaning and cutting; acidizing: immersing the rabbit skin in 1 wt% hydrochloric acid for 10 minutes; and carrying out gelatin extraction and centrifugal drying. The method can produce high-quality rabbit skin gelatin by combination of short-time dilute acid treatment and hot extraction, and has the advantages of short production cycle, low acid consumption and lower environmental pollution as compared with the traditional gelatin technique. Compared with the characteristics of the aquatic product gelatin, the gelatin produced by the method has the advantages of favorable gel characteristic, high quality and wide application range.

The invention discloses a method of using low-quality short fiber sepiolite for preparing a high-performance adsorbing material. The method is characterized by including the following steps that 1, low-quality short fiber sepiolite raw ore is purified to be ore concentrate, wherein the mass concentration of ore pulp is changed to be 2-5% at the moment; 2, the ore pulp is treated through a superconductivity magnetic separator, the intensity of a magnetic field is 3-5.5 T, and a filter cake is obtained through precipitating, filter pressing and dehydrating; 3, a double-screw mixer is adopted for mashing the filter cake, an acid agent is added, and the acid agent accounts for 2-10% of the solid content of the filter cake according to the addition quantity of the acid agent; 4, a material is fed into a microwave field to be kept for 5-30 minutes, wherein the microwave frequency is 2000 MHz-8000MHz; 5, the material is subjected to spraying, suction filtration and washing; 6, a pore-forming material is added into the material and is a mixture of active carbon and water glass, the mixture and the material are subjected to an ageing reaction and prepared into particles through granulation, and the high-performance adsorbing material is prepared through dehydrating and drying. The specific surface area and pore volume of the sepiolite treated through the method are increased obviously, and compared with a common treatment method, the adsorbing performance of the treated sepiolite is improved by one or more times.

The invention relates to a no pollution method for ginger processed saponin. It includes the following steps: washing yam, smashing, and grinding to slurry; depositing and separating to gain saponin slurry; acid hydrolysis saponin slurry; neutralizing and pressing, controlling the temperature at 40-80degree centigrade, pressure at 0.2-0.8MPa; distilling saponin. The waste water process method includes the following steps: taking fluid bed biology film process to the filtrate, accessing to compounding bacterium, the processed waste water could be directly discharged.

The invention relates to a method for extracting dioscin, comprising the following steps: (1), plants containing dioscin are dried, pulverized and sieved to obtain dry powder; (2), a surfactant is dissolved in water to prepare a solvent; (3), the dry powder obtained in the step (1) and the solvent prepared in the step (2) are mixed at the ratio of 1:0.1-100:1, reinforced extraction is carried out by ultrasonic wave, a solid is separated out, and an extracting solution containing the dioscin is obtained; and (4), the extracting solution is processed to obtain rough dioscin or crude diosgenin. Compared with a traditional extracting method adopting an organic solvent, the method completely avoids using volatile organic solvents, such as methanol, ethanol, and the like, the optimal extracting time is shortened to less than 20 minutes of the method from more than ten hours of a traditional method, and the extracting efficiency is enhanced by 4-5 percent. In addition, an aqueous solution of the surfactant is adopted to carry out leaching; and compared with methanol and ethanol used in the prior art, the dioscin has greatly reduced cost and good safety and is especially suitable for industrial large-scale production.

The invention discloses a wet selective desulfurization system. The wet selective desulfurization system comprises an absorption tower, a rich liquid tank, a sedimentation tank, an acid dissolving tank, an oxidation tank and a barren liquid tank which are sequentially communicated and form a closed loop structure. Meanwhile, the wet selective desulfurization system further comprises an acidification tank, wherein the acidification tank is arranged between the sedimentation tank and the barren liquid tank and is respectively communicated with the sedimentation tank and the barren liquid tank. The invention simultaneously discloses a wet selective desulfurization method which can be used for selectively absorbing hydrogen sulfide. According to the wet selective desulfurization system and the wet selective desulfurization method, the H2S absorption is strengthened effectively, and the CO2 absorption is weakened, so that the high-selectivity H2S absorption is realized; H2S can be effectively converted into elemental sulfur, so that the resource utilization efficiency is very high; meanwhile, during desulfurization, a supernatant in the sedimentation tank is subjected to acidification treatment by adopting the acidification tank, so that the acid and oxidation air consumption of the whole system can be reduced greatly; during separation, the operating efficiency of the whole system is very high, so that resources are saved, and the cost is reduced.

The invention discloses a modification of synthesizing technique of dispersion blue 60, which comprises the following steps: adopting 1, 4-diamino-2,3-dicyanidic anthraquinone as raw material to hydrolyze in the sulfuric acid as dielectric at 60-90 deg. c to obtain 1, 4-diamino anthraquinone-2,3-dicarboxylic imides to react with sodium hydroxide to generate corresponding sodium salt to dissolve in the water; adding active carbon to adsorb impurity; filtering under heating; adding sulfated closed-loop in the filtrate to produce 1, 4-diamino anthraquinone-2,3-dicarboxylic acid anhydrides; insulating the anhydride in the gamma-methoxy propylamine (or gamma-ethoxy propylamine) dielectric to react 2-3h under 40-50 deg. c to obtain the product.

The invention provides an extraction process of diosgenin, and particularly discloses a process for extracting saponin in yam through microbial strengthened fermentation in combination with a dilute acid catalytic hydrolysis method. The process comprises the following steps of: cleaning and crushing the yam; performing the microbial strengthened fermentation to separate the saponin from starch and cellulose; then hydrolyzing with dilute acid under the action of a catalyst to obtain the diosgenin; performing soxhlet extraction on hydrolysate by using a solvent; and finally crystallizing and drying to obtain the finished product diosgenin. The process has the advantages of simple process, short process time, less acid consumption, less wastewater, reduced COD (Chemical Oxygen Demand) in the wastewater, extreme easiness in treatment and capability of effectively reducing the cost and the pollution.

The invention relates to a method for removing pile of cotton seed and relative device, especially a flame-type pile removing method and special burning furnace. The method at least comprises a combing process and a pile burning process, wherein, the burning furnace comprises a burning room which contains a smoke outlet and a seed inlet, and a seed outlet at the bottom. The burning furnace is arranged with a burner with flame injector. The fresh seed treated by said invention can be fed into the furnish process, or treated by inventive method for two or three times then be fed into the furnish processes. The invention can be used as pretreatment of other process, as acid process to reduce the acid consumption.

This invention relates to a purifying method for composing diamond blocks including: 1, mixing a mixture of amine salt solution and HNO3 with a diamond combined block, adding 20-40g NH4Cl, 100-200 ml HNO3 and 200-400 ml water reacting for 2-3 h, 2, post process including washing, filtration, baking, meshing and the residual blocks enter into re-purification.

The invention provides a method for measuring trace elements in petroleum by using ICP-MS. A high-temperature and high-pressure closed digestion tank method is used in sample pretreatment. The methodfor measuring the trace elements in the petroleum by using the ICP-MS has the advantages of low acid content, low background, simple operation and the like. The risks of tank-overflow and tank-explosion are greatly reduced through a thermal exhaust method. Special acid-proof coating treatment is carried out on a steel sleeve, and the risk of contaminating a sample is greatly reduced. After the pretreatment, an nitric acid solution and a hydrofluoric acid solution are used for preparing standard solutions of the each trace element; the prepared standard solutions of the each trace element are put into the ICP-MS in sequence to obtain a required standard curve; and a blank sample solution and a sample solution to be detected are separately put into the ICP-MS to obtain a working curve, and aconcentration value of the each trace element is obtained and the final content is calculated according to the working curve. The detection method is simple and economical, and has a wide applicationrange, and the detection result is accurate and reliable.

The invention relates to a double column production method of gamma-aminobutyric acid by immobilized cell and D101 resin, which belongs to the technical field of green biological production; according to the double column production method, a D101 macroporous adsorption resin column is taken as an auxiliary reaction column and is coupled mutually with an immobilized enterococcus faecium cell reaction column, and the coupled macroporous adsorption resin column and the immobilized enterococcus faecium cell reaction column are connected with other auxiliary installation or equipment to form a cyclic reaction system, efficient conversion is realized as a reaction substrate is cycled between the D101 macroporous adsorption resin column and the immobilized enterococcus faecium cell reaction column, and productivity of the gamma-aminobutyric acid is improved; compared with a catalytic reaction method only using the immobilized enterococcus faecium cell reaction column, the output of the gamma-propalanine produced by the invention can be increased by 196.32%. Besides, purification of the gamma-aminobutyric acid also can be realized through the adsorption effect of the D101 resin column, a downstream process is simplified, the cost is reduced, and is environmentally friendly.

The invention relates to the technical field of natural rubber primary processing, and in particular relates to an ammonia-free preservative for natural fresh latex. An oxidation-type bactericide is selected from a large amount of solid, water-soluble, non-volatile and broad-spectrum bactericides aiming at pollution problems of ammonia and ammonia composite preservatives, and the oxidation-type bactericide is compounded with an alkaline stabilizer to be used as a preservation system of the natural latex. The novel preservation system provided by the invention has the characteristics of a goodpreservation effect, low costs, no ammonia, no volatilization, no irritation, easy solubility in water and convenient use, and can preserve the natural latex for a plurality of days, and the preparedraw rubber has excellent properties, especially has significantly-improved aging resistance; and in addition, the preservative can also be applied to early-stage preservation in the ammonia-free concentrated latex preparation process, and the overall costs are lower than those of a currently-used ammonia and TT/ZnO systems.