767results about How to "Reduce purification costs" patented technology

The present invention provides an economical and efficient method to prepare various substituted 2,4-pyrimidinediamine compounds in large scale quantities.

The invention discloses a method of extractive purifying industrial alcaine, which comprises the following steps: setting triallylamine as extractant, isooctanol as assisting solvent and coal oil as diluent; forming extract organic phase through kerosene; extracting industrial alcaine in the extract pot; washing through pure water; stripping; getting high-purity alcaine. The invention possesses steady quality and high-purity, which can realize continuous mass production.

The invention discloses a high-efficiency composite desulphurization solvent and a system and method for removing acidic gas and organic sulfur. The high-efficiency composite desulphurization solvent comprises, by mass, 70-85% of compound amine, 10-20% of a desulfurization enhancer, 10-30% of a physical solvent, 0.01-0.1% of an antifoaming agent, 0.5-2% of a benzylamine anti-oxidant and 0.5-2% of a heterocyclic amine antiseptic. The high-efficiency composite desulphurization solvent has the advantages of large acidic gas load, low sulfur content of purified gas, stable solvent performances and no corrosion on equipment, and can remove most of H2S and a large part of organic mercaptan from mixed gas. The high-efficiency composite desulphurization solvent and the system and method can greatly reduce a gas purification cost and reduce total sulfur content of the purified gas. The high-efficiency composite desulphurization solvent and the system and method can be used for removing H2S, CO2 and organic mercaptan in natural gas, petroleum refinery gas and synthetic gas.

The invention relates to an energy-saving environment-friendly sintering waste gas waste-heat utilization and pollutant purification process and system. The energy-saving environment-friendly waste gas waste-heat utilization and pollutant purification process includes that sintering waste gas is divided into a low-temperature low-sulfur sintering waste gas, a middle-temperature high-sulfur sintering waste gas and a high-temperature middle-sulfur sintering waste gas according to waste gas temperature and pollutant discharge characteristics; content of sintering waste gas SO2 of the low-temperature low-sulfur is below the national discharge standard, and the SO2 can be directly discharged after dust removal; after the sintering waste gas in a middle-temperature high-sulfur section is subjected to dust removal and desulfurization processing, the SO2 meets the national discharge standard and can be discharged; the sintering waste gas in a high-temperature middle-sulfur section mixed with ring-cold waste gas is led into a sintering machine, and hot-wind igniting and hot-wind sintering are performed. The invention further provides a system for implementing the energy-saving environment-friendly sintering waste gas waste-heat utilization and pollutant purification process. Waste heat of the sintering waste gas can be recycled in classification and gradiently utilized, so that energy can be saved; the low-sulfur waste gas can be discharged directly, so that desulfurization cost of the waste gas is lowered; part of the high-sulfur waste gas participate in circulation, so that total discharge amount of pollutants is decreased, splitting decomposition of dioxin happens due to high temperature, and the purification function of the sintering waste gas is achieved.

The invention discloses a VOC (volatile organic compound) waste gas treatment system. The VOC waste gas treatment system sequentially comprises a fan, a padding spray tower device, an ultraviolet activated carbon integrated device and a purified gas discharge opening, wherein the fan is connected with a VOC waste gas source; the padding spray tower device is connected with an air outlet of the fan; the ultraviolet activated carbon integrated device is connected to an air outlet of the padding spray tower device; the purified gas discharge opening is connected to the ultraviolet activated carbon integrated device. Waste gas is treated efficiently by the design of combining the padding spray tower with the ultraviolet activated carbon integrated purifier. Firstly, the padding spray tower is used for spraying washing; organic waste gas is dissolved into a purifying liquid well by multi-surface hollow spheres; then air water of a defogging layer is matched to share efficiently, so that gas after primary treatment is obtained by the padding spray tower. The gas after primary treatment is treated by the ultraviolet activated carbon integrated purifier, and clean gas reaching the standard is discharged out. The size of the device is reduced; the waste gas treatment efficiency is high; the purification cost is reduced; the purification standard reaching effect is ensured.

The invention discloses a mercury contaminated soil in-situ restoration method. The method includes: preparation of extracting agent, namely dissolving water-soluble iodized salt, sulfate, nitrate and thiosulfate into water to prepare the extracting agent for restoration of mercury contaminated soil; and purification of mercury contaminated soil and regeneration of the extracting agent, namely subjecting the mercury contaminated soil and the extracting agent to mixing, stirring and centrifugal separation, wherein the centrifuged soil is clean soil; extracting 90% of mercury absorbable and usable for plants into supernatant, adding precipitating agent to recover mercuric sulfide and realize regeneration of the extracting agent, and reusing the regenerated extracting agent for the soil. Details are shown in the specification. The mercury contaminated soil in-situ restoration method has the advantages that mercury absorbable and usable for plants in soil is separated by extracting, and the purification efficiency is up to 90%; and materials of the extracting agent are low in cost and easy to obtain, the extracting agent preparation method is simple, feasible, recyclable and reusable, and thereby mercury contaminated soil purification cost is greatly reduced.

The invention discloses a method for producing fatty acid by hydrolyzing lipid through three liquid-phase lipase catalytic systems. The method comprises the following steps: firstly, preparing enzyme solution with the lipase concentration of 5-20000 U/mL, and adding soluble inorganic salts, alcohol/ketonic hydrophilic fraction and lipid to the enzyme solution so as to form three liquid-phase systems; secondly, laying the prepared three liquid-phase systems into an agitated vessel for reaction, standing or centrifuging the systems after the reaction so as to divide the systems into an upper layer, a middle layer and a lower layer, and collecting products in the upper layer so as to obtain fatty acid phase. The method adopts the three liquid-phase systems to extract fatty acid in crude enzyme solution, performs direct hydrolyzing to produce fatty acid, can not only greatly reduce the production cost of enzyme, but also solve the problems of high energy consumption for glycerol and enzyme separation, high cost, high pollution and the like.

The invention discloses a purity method for heavy metal in the bivalve shellfish. The purity method is: culturing the bivalve shellfish temporarily in the sand leach natural sea water that is 22 to 28 Deg.C of the water temperature, 12 to 32 per micrometer salinity, and continuous charge, releasing microalgae into the sand leach natural sea several times for purity treatment for 2 to 31 days. Purifying bivalve shellfish with the present invention, the heavy metal can be discharged 40 to 50 percents, which meets the edible hygienic standards.

The invention relates to a method of the catalytic oxidation and purification of tail gas containing hydrocyanic acid, in particular to a method for purifying the tail gas containing hydrocyanic acid by using a chemical method. The tail gas containing hydrocyanic acid is enabled to react with a prepared mixed catalyst solution containing palladium and copper under the temperature of 4 to 100 DEG C in a absorption tower, and the tail gas containing hydrocyanic acid is blown into the absorption tower in a gas-liquid negative-direction contact way, part of the hydrocyanic acid contacts and reacts with the palladium ions to form insoluble palladium simple substance, and part of the hydrocyanic acid reacts with the copper ions to form insoluble phosphor copper, part of the hydrocyanic acid is oxidized into phosphoric acid; all the generated substances enter into the liquid phase, and the mixed catalyst solution which absorbs the hydrocyanic acid and the purified and qualified tail gas not containing the hydrocyanic acid are acquired, the mixed hydrocyanic acid catalyst solution is oxidized into a by-product of the phosphoric acid to be used as resources again, the problems of hydrocyanic acid pollution is effectively eliminated, and the method provided by the invention provides a practical purifying method for the calcium carbide furnace gas and yellow phosphorus exhaust gas used as monocarbide chemical raw materials.

The invention discloses a method for continuously refining L-lactide from crude L-lactide, which comprises the following steps of: firstly, performing at least once lightness removal to the crude L-lactide by using a lightness-removing column, sending melted crude L-lactide into the middle of the lightness-removing column, refluxing and separating as well as distilling the crude L-lactide in the lightness-removing column, condensing vapor distillate at the upper end of the lightness-removing column for removing water, L-lactate and meso-lactide; secondly, enabling column bottom liquid to enter a reboiler for vaporization and then enter into the column, performing at least once rectification to the left column bottom liquid through a treating column after cooling, wherein the lower end of the lightness-removing column mainly has high-boiling point distillate liquid comprising the L-lactide and lactate oligomer; and when in rectification, refluxing and separating the column bottom liquid of the lightness-removing column to obtain a refined L-lactide; refining column bottom flow to obtain concentrated lactate oligomer. The L-lactide purified by the method can be directly used in the polymerization of poly L-lactate, thereby lowering the purifying cost of the L-lactide, increasing the yield, and being environmental friendly without organic solvents.

The invention discloses a high-temperature dust-removing and coke-removing integrated purifying process of biomass crude gas and provides a new process for high-efficiency purification of biomass high-temperature gas at low cost. The process comprises a high-temperature gas heat exchanger (A), a high-temperature gas purifier (B), a Venturi pulse back-blowing system (C), a gas preheater (D) and an electric-heating insulation system (E), wherein the five sets of equipment operate cooperatively to form a set of complete high-temperature gas purifying integrated device; a filtering medium in the high-temperature gas purifier is a modified ceramic membrane dust-removing pipe. When filtering cakes on the outer surface of the modified dust-removing pipe are deposited to certain thickness, deposited ash can be back-blown into an ash discharging hopper box for collection by the Venturi pulse back-blowing system. The high-temperature dust-removing and coke-removing integrated purifying process disclosed by the invention has the advantages that high-efficiency separation and integrated treatment of ash and coke components in biomass gas are realized; the dust-removing temperature is low so as to be beneficial to reducing the manufacturing cost of the equipment and prolonging the service life; biomass ash side products with commercial value are produced while the high-efficiency purification of the biomass crude gas is realized; the process flow is simple and flexible, the operation is simple, the purification cost is low and the suitability for industrial production is achieved.

The present invention relates to solvent extracting process as industrial wet process phosphoric acid purifying process. On the basis of technological process of preparing industrial phosphoric acid with wet process phosphoric acid, the present invention has the measures of: 1) setting desulfurizing and defluorinating buffer in the pre-treating section and setting one re-desulfurizing and deferrizing tank between the extracting tank and the washing tank for reinforced desulfurizing, defluorinating and deferrizing; 2) performing extraction, washing and reverse extraction in the rotary vibrating sieve-plate tower; and 3) setting one demulsifying tank between the washing tower and the reverse extracting tower. The present invention has one special rotary vibrating sieve-plate tower developed as the key apparatus. The present invention is used in the industrial production of purifying wet process phosphoric acid and has greatly reduced loss and low cost.

The invention relates to a high-purity sodium rabeprazole compound, belonging to the technical field of medicine. The method includes the following steps: dissolving crude sodium rabeprazole synthesized by the reaction of rabeprazole and sodium hydroxide in water, adjusting pH value to be faintly acid to neutral by using solid acid salt, and collecting precipitated solid; after dissolving the solid with organic solvent, conducting elution and purification by using eluting agent through macroporous adsorption resin, and collecting eluent; and adjusting the pH value of the eluent to be alkaline, and collecting the precipitated solid to obtain the pure sodium rabeprazole.

The invention provides a method for purifying the exhaust gas with low concentration of phosphine. The method is characterized in that an absorption liquid and a solid catalyst are put into a bubbling reactor according to the ratio of 100 ml:1-3 g; the gas containing low-concentration phosphine is allowed to enter the reactor; the reaction temperature is controlled to be 40 DEG C to 80 DEG C; phosphine is purified in the bubbling reactor; and the tail gas after purification has the concentration of phosphine as low as 50 mg/m<3>. The method has the advantages as follows: (1) the method is simple, the operability is strong, the purification efficiency is improved, and the purification cost is reduced; (2) the catalyst is easy to separate, reclaim and reuse; (3) the bubbles in the bubbling reactor are tiny and uniform, thereby strengthening the dissolution of phosphine in the absorption liquid; (4) the reaction conditions are mild and easy to implement; and (5) phosphoric acid can be reclaimed for re-implement of changing waste into resource.

The invention discloses a method for comprehensively recovering carbon from the extraction of vanadium from stone coal, which comprises: firstly, milling stone coal, adding water into the stone coal to prepare slurry, adding the inhibitor and flotation collector of gangue and pyrite, keeping the pH value of the slurry between 9 and 11.5, and floating to obtain carbon-enriched vanadium concentrate and tailings; and secondly, adding sulfuric acid in an amount which is 1.0 to 3.0 times the stoichiometric number of the acid soluble substance for reacting with the sulfuric acid in the carbon-enriched vanadium concentrate into the carbon-enriched vanadium concentrate for soaking the carbon-enriched vanadium concentrate in acid at normal pressure or reduced pressure or soaking the carbon-enriched vanadium concentrate in water after low-temperature sulfation and roasting, and filtering to obtain vanadium-containing leachate and vanadium extraction slag; using the vanadium-containing leachate for vanadium extraction; and selling the vanadium extraction slag, which is coal powder, as a fuel. The method can improve the comprehensive utilization rate of resources and the comprehensive economic benefit of vanadium extraction and reduce the industrial exploitation grade of the extraction of vanadium from stone coal. The method has high vanadium extraction rate and is environmentally-friendly. The coal powder, which is produced after the extraction of vanadium from the carbon-enriched vanadium concentrate obtained by stone coal flotation has low vanadium content and low sulfur content, so the corrosion to a burner and the wear caused by smelting slag to the burner when the stone coal is burnt are reduced effectively and the smoke desulfuration and purification cost are reduced at the same time. The method is suitable for industrial production.