1733 results about "Adsorption method" patented technology

This invention comprises an adsorption process for the removal of at least N₂O from a feed gas stream that also contains nitrogen and possibly CO₂ and water. In the process the feed stream is passed over adsorbents to remove impurities such as CO2 and water, then over an additional adsorbent having a high N₂O/N₂ separation factor. In a preferred mode the invention is an air prepurification process for the removal of impurities from air prior to cryogenic separation of air. An apparatus for operating the process is also disclosed.

The present invention is directed to an evaporative emissions control apparatus for minimizing fuel vapor emissions from a fuel storage system in a vehicle with an internal combustion engine. More specifically, the present invention is directed to an evaporative emissions control apparatus comprising a canister filled with a hydrocarbon adsorbent. The present invention is also directed an evaporative emissions control apparatus comprising a support substrate, which is coated with a hydrocarbon adsorbent slurry.

The invention discloses a method for extracting lithium from salt lake brine by an adsorption method. The method comprises the following steps of: (1) making the salt lake brine pass through aluminum salt-containing adsorption resin at a speed of between 5 and 10 BV/H at the temperature of between 20 and 100 DEG C to ensure that the lithium ions in the salt lake brine are adsorbed on the adsorption resin; (2) making lithium ion eluant pass through the aluminum salt-containing adsorption resin at a speed of between 5 and 10 BV/H at the temperature of between 20 and 100 DEG C to ensure that thelithium ions adsorbed on the aluminum salt-containing adsorption resin are eluted and desorbed into the eluant solution so as to obtain desorption liquid; and (3) making the desorption liquid pass through common sodium cation exchange resin at a speed of between 5 and 10 BV/H to remove magnesium from the desorption liquid, and then concentrating to obtain a lithium salt. The method has the advantages of low consumption of chemical materials, simple process, easy operation and no pollution.

The invention discloses an adsorption method for preparing hydroxyapatite pesticide and slow-release fertilizer compound, which comprises the following steps: soaking a nano hydroxyapatite carrier in phosphate buffer solution, then adding a starting material into the buffer solution and continuously stirring the mixture to form compound solution, finally centrifuging the compound solution to obtain sediment, and drying the sediment to obtain the compound. By using a porous structure of the nano hydroxyapatite self to embed medicaments into an internal grid of the carrier, the burst effect of the medicaments is avoided, the medicinal effect is long, the medicament residue is greatly reduced, and the medicaments are safer. A product obtained by using the nano hydroxyapatite as a pesticide and fertilizer carrier has the advantages of reliable quality, strong stability, safe use and low cost, greatly improves the medicament loading amount and adsorption amount, is easy for continuous production, and has good application prospect.

The invention relates to an air purification medium unit, an air purification device and an air purification method. The air purification medium unit comprises an upstream filtering unit, a middlestream adsorption-desorption unit, and a downstream photocatalysis unit. Meanwhile, with the air purification medium unit, the air purification device is designed and a set of the air purification method is formed. By aiming at characteristics of light catalysis and an adsorption method, the adsorption method is combined with photocatalysis, so that activated carbon and activated carbon fiber adsorption and desorption-TiO2 (titanium dioxide) photocatalysis technology becomes an air purification technology with high efficiency and long service life. On the one hand, the activated carbon or the activated carbon fiber is desorbed to be regenerated in situ, thereby reducing the original replacement cycle of a filter element; and on the other hand, the activated carbon or the active carbon fiber is desorbed to provide a high-concentration reaction environment for the photocatalysis of TiO2, so as to accelerate the reaction rate.

The invention discloses a method for separating tombarthite from phosphorus ore and relates to the method for separating the tombarthite from the phosphorus ore containing the tombarthite. The method is characterized in that the process steps are as follows: (1) mixing phosphate concentrate containing the tombarthite with a phosphoric acid solution for performing reaction; (2) filtering for getting a reaction solution and slag containing the tombarthite; (3) adding acid into the slag containing the tombarthite for leaching for getting leachate containing the tombarthite, and further recycling the tombarthite through one or more of an extraction method, an ion exchange adsorption method, a precipitation method and a crystallization method; and (4) performing decalcification on the reaction solution obtained by filtration and then returning to the step (1). By adopting the method, the precipitation rate of the tombarthite in the phosphorus ore is greater than 85%, the slag rate is small, the grade of the tombarthite in the slag is high, the leaching rate of the tombarthite in the slag is high, no additives are added during the process and the product quality of the phosphoric acid is not affected; and furthermore, the phosphoric acid used during the process can be self-produced and can also be circulating dilute phosphoric acid, dilute phosphoric acid and the like generated during the production process of the phosphoric acid, thereby being tightly linked with the production process of the phosphoric acid through the sulfuric acid method.

The invention provides a recovering system and a method of C2 in refinery dry gas by a compound adsorption method. The recovering system comprises a compressor, a pretreatment unit, a refinery dry gas cooling unit, a compound adsorption unit and a rectification unit. The adsorption unit comprises a gas-liquid separating tank, a C2 adsorption tower, and a methane desorption tower. The rectification unit comprises a C2 removing tower and an ethylene rectification tower. The refinery dry gas, after being compressed, pretreated and cooled, is subjected to gas-liquid separation to obtain a gas phase and a liquid phase. The gas phase is fed into the C2 adsorption tower and subjected to C2 adsorption by using a C4 mixture or a C5 mixture as an absorbent. The liquid phase is fed into the methane desorption tower, and subjected to methane desorption through stripping. The mixed adsorption oil at the bottom of the C2 adsorption tower and desorption gas at the top of the methane desorption tower are returned to the gas-liquid separation tank after being mixed and cold with the refinery dry gas. Tower bottom of the methane desorption tower is cooled and fed into the C2 removing tower and the ethane rectification tower to be rectified to obtain an ethylene product and an ethane product. The method provided by the invention adopts moderate operating conditions. The ethylene and the ethane both have the high recovering rate and the high purity.

The invention discloses a method for determining contribution of pores with different apertures in a shale reservoir stratum to porosity, and belongs to the technical field of petroleum, geology and mining exploration and development. The method comprises the following steps: selecting three groups of parallel samples from shale reservoir stratum samples at the same depth; carrying out a low-temperature nitrogen adsorption-desorption experiment on the first group of samples to determine contribution of the pores with aperture ranging from 0.4-100 nm to the porosity; carrying out argon ion polishing and electron scanning microscope examination on the second group of samples to determine the contribution of the pores with aperture ranging from 50 nm to 3 microns to the porosity; carrying out mercury intrusion analysis on the third group of samples to determine the contribution of the pores with aperture greater than 1000 nm to the porosity; synthesizing the analytic data of the three groups of parallel samples, and obtaining the determination results of contribution of the pores with different apertures in the shale reservoir stratum to the porosity. The method can determine the contribution of the pores with different apertures in the shale reservoir stratum to the porosity, and overcomes the defect of the conventional gas adsorption method and the mercury intrusion method for determining the contribution of the pores with different apertures in the shale reservoir stratum to the porosity.

The invention relates to a passivator for remediation of farmland soil subjected to combined pollution of heavy metals such as cadmium, chromium, copper and nickel, and a preparation method and a use method of the passivator. The passivator is prepared from a passivator A and a passivator B, wherein the passivator A is prepared from montmorillonite, kieselguhr, sepiolite, illite and ferrous sulfate; the passivator B is prepared from periclase, calcite, calcium magnesium phosphate fertilizer, plant ash and calcium hydroxide; the passivator is suitable for the farmland soil subjected to the combined pollution of the cadmium, the chromium, the copper and the nickel, and is prepared from the multiple different porous absorption materials with specific contents and a passivation material; the components of the passivator have complementary advantages, and the principles such as absorption and stabilization are combined; the combination forms of the heavy metals are effectively enhanced by ion exchange, complexing, chelating and adsorption methods, and the combination forms are converted into more stable strong organic binding states and residue states, so that the effective state contents of the heavy metals in the farmland soil are effectively reduced, and the passivation effect is long-acting and stable; therefore, the passivator has a great repair effect for the farmland soil subjected to combined pollution of the cadmium, the chromium, the copper and the nickel.

A method of operating a thermal swing adsorption process by determining a parameter relating to the water content of a feed gas selecting process conditions for regeneration of the adsorbent in the thermal swing adsorption process based on the parameter and modifying the regeneration process conditions to accord with the selected process conditions for regeneration is disclosed. Apparatus for effecting this adsorption method and apparatus in which regeneration conditions are modified based on the actual ambient water content of the feed gas are also disclosed.

The invention provides a light promoting dehalogenation compound medicament/light combined method for removing halogenated organic matters in water, which relates to a method for removing halogenated organic matters in water. The invention overcomes various defects existing in the process of removing halogenated organic matters in water by using the current gas stripping method, activated carbon adsorption method, electrochemical removing method, advanced oxidation method, transition metal catalytic reduction method, vacuum ultraviolet technique or permeable reactive barrier technique. The method of the invention comprises the following steps: adding the light promoting dehalogenation compound medicament into the water containing halogenated organic matters for stirring, and then, carrying out optical radiation. The method of the invention does not need multi-stage removal, does not need expensive oxidants and catalysts, does not generate secondary pollution, does not need expensive vacuum ultraviolet light sources and high-energy radiation sources, can utilize common and cheap ultraviolet pop light sources or even expanding to visible light sources, improves the utilization efficiency of the light energy, can quickly remove the halogenated organic matters, can conveniently design a reactor, meets the requirements of various water bodies, is convenient in management, and can ensure the safety of the water quality.

The invention discloses a trap method for Empoasca vitis Gothe imago,nympha and spiny white fly imago, comprising the steps: 1)separating and authenticating 9 volatile matter from sturdy tea twig using adsorption method 2) determining three volatile ingredient with allure activity using biological determination method 3)respectively preparing three active ingredient, concentration 0.01-20mu g/ml, mixing according to 1:0.2-1.5:0.1-1, preparing attractant, 4)determining three colors with alluring effect to Empoasca vitis Gothe and spiny white fly from ten colors in the tea garden allure experiment, three colors being parrot green, bud green and jasmine yellow 5) combining attractant with bud green and jasmine yellow, making trapper for Empoasca vitis Gothe and spiny white fly The advantage of the invention : 1)no pollution, adapting to organic tea and nuisance free tea production, 2) low cost.

The invention discloses a method for extracting lithium from salt lake brine by using an adsorption method. The method comprises the following steps of adding an absorbent in the brine; absorbing the lithium ions in the brine to the absorbent; then treating by using a ceramic membrane; retaining the absorbent in a concentrated solution; subjecting the concentrated solution to plate-frame pressure filtration to obtain an absorbent filter cake; removing most of impurities and water from the brine; washing the filter cake with water and desorbing with an eluent to obtain a desorption solution; removing magnesium from the desorption solution by passing the desorption solution through a weak acid type cation exchange resin; concentrating with a reverse osmosis membrane to obtain a refined lithium solution for preparing lithium carbonate. The method is simple in process and can be operated easily. The absorbent has high utilization efficiency; a lithium-extracting process is short; and the content of the prepared lithium solution is high.

The invention relates to a manganese dioxide/carbon combined electrode and an electric adsorption method for electrically adsorbing heavy metal ions from water. The manganese dioxide/carbon combined electrode is manufactured by taking a carbon material as a substrate and supporting manganese dioxide on the substrate. A voltage is applied to the manganese dioxide/carbon combined electrode so that electropositive heavy metal ions in water migrate to a cathode under the action of electric field force, and therefore, heavy metal ions in water are removed by electric adsorption. The manganese dioxide/carbon combined electrode is simple in preparation method, large in capacitance, high in electrochemical stability and large in specific surface area of electrode, and thus very suitable for being used as an electric adsorption electrode material; under the action of the applied electric field, the adsorption effect of the supported manganese dioxide on heavy metal ions is enhanced, quick and efficient removal of heavy metal ions in water can be realized and quick and convenient regeneration of the electrode material also can be realized; the shortcoming in the prior art low-concentration heavy metal ions in water are hardly removed is overcome, and therefore, the manganese dioxide/carbon combined electrode and the electric adsorption method can be used for removing the heavy metal ions having the concentration of several to dozens of ppm out of water.

An adsorbent for removing hepatitis C virus which has the ability to adsorb HCV particles, particularly immune-complex HCV particles, from a patient's body blood safely and with high efficiency and high selectivity for enhancing the efficacy of interferon therapy, an HCV adsorption apparatus including said adsorbent, and a adsorbing method for removing HCV are provided. An adsorbent for removing hepatitis C virus which comprises a compound capable of adsorbing hepatitis C virus as immobilized on a water-insoluble carrier, an adsorption apparatus including said adsorbent, and an adsorbing method for removing HCV.

The invention discloses a method for eliminating tetracycline in the water by a adsorption method; Mesoporous carbon is taken as adsorbent to adsorb and eliminate the tetracycline in the water; the method particularly includes the following steps: 1) synthesizing a template SBA-15 of the mesoporous carbon; 2) taking the SBA-15 as the template to synthesize mesoporous carbon CMK-3; 3) taking the mesoporous carbon CMK-3 as an adsorbent to adsorb tetracycline in water. By adopting the adsorption method to eliminate the tetracycline in the water, the method of the invention can achieve the adsorption performance which is significantly superior to that of the traditional adsorbing material (like activated carbon). Furthermore, the method of the invention has simple operation and significant treatment effect, and the material is easy to be obtained. The method of the invention has high economic and environmental benefits on the elimination of the tetracycline in the water of a micro-polluted water source.

The invention discloses a method for recovering rare earth from rare-earth-contained phosphorite, which relates to the method for recovering the rare earth from phosphorite and is characterized by comprising the following steps: mixing a rare-earth-contained phosphate concentrate with a phosphoric acid solution for stirring reaction; immersing the rare earth into the solution; carrying out solid-liquid separation to obtain a rare-earth-contained phosphoric acid solution; then, separating and recovering the rare earth from the rare-earth-contained phosphoric acid solution through uniting one or several of an extraction method, an ion exchange adsorption method, a precipitation method and a crystallization method; and enabling the phosphoric acid solution after slag is leached and the rare earth is separated and recovered to enter a wet-process phosphoric acid production system to produce a phosphoric acid. In the method for recovering the rare earth from the rare-earth-contained phosphorite, by taking the phosphoric acid solution as a leaching agent, the rare earth is extracted from the rare-earth-contained phosphorite without adding a surface active agent, thereby, the quality of a phosphoric acid product is not influenced, and the rare-earth leaching rate is about as high as 90 percent, and moreover, the leaching agent for leaching the rare earth is the phosphoric acid generated in the phosphoric acid production course, and can also be circular dilute phosphoric acid, diluted phosphoric acid and the like generated in the phosphoric acid production course. The method for recovering the rare earth from the rare-earth-contained phosphorite is tightly linked with a sulfuric acid-method phosphoric acid production process.

A swing adsorption process for removing contaminants from a gaseous feed stream through a combination of a selective adsorbent material containing an effective amount of a non-adsorbent filler, adsorbent contactor design, and adsorption cycle design.