891results about How to "Facilitate desorption" patented technology

An absorbent, such as, for example, an active carbon, is provided in an intake air passage, for example, in an air cleaner, to efficiently adsorb fuel vapor. To ensure that fuel vapor adsorbed into the intake air passage can be efficiently desorbed even when there is only a small amount of the intake air, an intake throttle valve is provided upstream of the adsorbent and an opening of the intake throttle valve is throttled so as to decompress an area near the adsorbent. Desorption of fuel vapor also can be efficiently promoted by using a heater to directly heat the adsorbent in the intake air passage or by heating the intake air to indirectly heat the adsorbent.

A fuel vapor storage canister for an automotive vehicle, includes a casing formed thereinside with charge, purge and drain ports connected to a gas passage. First, second, third and fourth adsorption layers are disposed in the gas passage and arranged in order of first, second, third and forth adsorption layers from side of the charge port along a longitudinal direction of the gas passage. Each adsorption layer includes a fuel vapor adsorbent. Additionally, a first space section is formed between the first and second adsorption layers. A second space section is formed between the second and third adsorption sections. A third space section is formed between the third and fourth adsorption sections. Each space section has a width in the longitudinal direction of the gas passage.

The invention belongs to the field of energy and coal mine safety, and particularly relates to a coal mine down-hole drilling penetration improvement method based on a controllable shock wave technology. The method aims at solving the problems of high labor intensity and low safety of an existing gas treatment mode. Controllable shock wave generation equipment is pushed to the interior of a drilling hole, and after a hole opening sealing device is installed at a hole opening of the drilling hole, water is injected to the drilling hole; after the drilling hole is fully filled with the water, operation is conducted segment by segment, the middle of each operation segment is used as an operation point of shock waves, and repeated impact is conducted on each operation point multiple times. Under the effect of the injected water in the hole, the shock wave generation equipment does not need to work under the environment with explosive gas, and the shock waves are also efficiently coupled toa coal bed.

The invention discloses a polypyrrole/polyvinylidene fluoride nano fiber composite resistance type film gas-sensitive element and a manufacturing method thereof. The method comprises the following steps of: depositing polyvinylidene fluoride nano fiber on a ceramic matrix electrode with golden interdigital by adopting an electrostatic spinning method, and then compounding polyaniline on the polyvinylidene fluoride nano fiber by gas phase in-situ polymerization to obtain a polypyrrole/polyvinylidene fluoride nano fiber composite gas-sensitive film. The preparation process is simple, has low cost, and is particularly suitable for batch production. The prepared gas-sensitive element has the advantages of high response sensitivity on ammonia gas at room temperature, good linearity and the like, has good response repeatability on high-concentration ammonia gas, and can be widely applied to room temperature on-line detection of ammonia gas concentration in an industrial and agricultural production process and an atmospheric environment.

The invention discloses a microwave and ultrasonic synergistic enhanced coalbed methane recovery method. The microwave and ultrasonic synergistic enhanced coalbed methane recovery method is especially suitable for a spongy high gas coalbed. The microwave and ultrasonic synergistic enhanced coalbed methane recovery method comprises the following steps: feeding a microwave antenna and an ultrasonic transducer into a ground well; enabling the microwave antenna and the ultrasonic transducer to be respectively connected with a microwave generator and an ultrasonic generator; turning on the microwave generator and the ultrasonic generator, and disturbing a coal body by elastic waves; meanwhile, using microwave heating to promote desorption of coalbed methane and hastening pores and fissures in the coalbed; migrating the coalbed methane to the ground well under the microwave and ultrasonic synergic action; finally, recovering the coalbed methane. The microwave and ultrasonic synergistic enhanced coalbed methane recovery method disclosed by the invention has important significance for improving the recovery of the coalbed methane and improving the safety of coal mining.

A process for preparing bromine from concentrated seawater includes such steps as acidifying, oxidizing, air blowing-out, SO2 absorbing and distilling.

Provided is a cutting-exploding coupled coal anti-reflection method in a drilled hole. A large number of effective seam grooves are formed in a coal seam through a hydraulic cutting seam technology, and therefore effective decompression can be performed on coal within a certain range, and methane gas desorption seepage is promoted. Through a sucking pump, methane gas in the drilled hole is pumped into a closed explosive vessel arranged outside the drilled hole. High-pressure and high-temperature mixed methane gas with the concentration being 9.5% to 10.5% can be formed in the explosive vessel. The mixed gas is detonated through an igniting device, high-energy gas is formed, the drilled hole is impacted under guiding of a guiding pipe, and the coal further fractures on the basis of original seam grooves. Initial explosion temperature, initial pressure and igniting energy are reasonably selected according to the coal bed condition, optimal explosive capacity is formed in the explosive vessel, fracture network expansion is fully promoted, methane gas adsorption potential can be remarkably reduced, methane gas desorption is promoted, and the purpose of intensifying methane gas extraction is achieved. The method is simple, safe, reliable, low in cost and easy to operate, and time and labor are saved.

The invention relates to a microwave-assisted supercritical carbon dioxide cyclic fracturing system and a microwave-assisted supercritical carbon dioxide cyclic fracturing method. The microwave-assisted supercritical carbon dioxide cyclic fracturing system comprises a liquid carbon dioxide tank, a heater, a boosting pump, a fracturing pipe, a return pipe, a three-phase separator, an air compressor and a cooler which form a loop to achieve supercritical carbon dioxide cyclic fracturing, and a fracture network is formed in a coal seam. According to the microwave-assisted supercritical carbon dioxide cyclic fracturing method, the coal seam and carbon dioxide are subjected to microwave heating to ensure that the carbon dioxide is in the supercritical state for a long time, and heat effect of microwave heating is capable of fracturing coal masses, dredging pores and promoting gas desorption. The microwave-assisted supercritical carbon dioxide cyclic fracturing system and the microwave-assisted supercritical carbon dioxide cyclic fracturing method have the advantages that the supercritical carbon dioxide high in diffusivity is capable of going deep into coal mass pores and fractures quite easily as well as dispelling gas; operation costs are reduced effectively and the construction technology is simplified effectively through cyclic fracturing; microwave radiation is combined with supercritical carbon dioxide cyclic fracturing to increase porosity and permeability of the coal seam greatly and promote gas desorption, so that gas extraction effects are improved substantially, and the system and the method are highly practical in the field.

The invention discloses an in-borehole gas explosion coal body cracking forced extraction method, and is applied to the efficient extraction of underground gas of a coal mine. An air pump is used for pressing air into a sealed borehole, the air and gas gushed from the borehole are premixed to form mixed gas at concentration of 9 to 10 percent, and the mixed gas is detonated by virtue of an ignition device to form explosion waves to crack a coal body to construct a fracture network; meanwhile, by thermal effects achieved by explosion, the adsorption potential of the gas can be remarkably lowered, and the desorption and the flowing of the gas can be promoted, so that the aim of forced gas extraction of a high-gas low-air-permeability coal seam is fulfilled. The method is low in cost, simple, easy, time-saving and labor-saving; the effective pressure relief influence scope of a single hole can be remarkably widened, and the gas extraction efficiency of the coal seam can be improved by over 40 percent.

Provided are methods for determining the amount of thyroglobulin in a sample using various purification steps followed by mass spectrometry. The methods generally involve purifying thyroglobulin in a test sample, digesting thyroglobulin to form peptide T129, purifying peptide T129, ionizing peptide T129, detecting the amount of peptide T129 ion generated, and relating the amount of peptide T129 ion to the amount of thyroglobulin originally present in the sample.

The invention discloses an enhanced extraction method for fracturing a coal body by multistage gas explosion in a drill hole. The enhanced extraction method is suitable for high-efficiency extraction of underground gas of a coal mine. Air is pressed in a sealed drill hole by using an air pump; the air and gas gushed from the drill hole form gas mixed gas with the concentration of 9-10 percent; the mixed gas is detonated by an ignition device to form an explosive shock wave for fracturing the coal body around the drill hole; the later-stage explosion is realized on the basis of the previous-stage explosion, so that cracks of the coal body around the drill hole are further expanded; besides, the shock wave compress the coal body to form a greater explosion space, and the power of explosion is enhanced. By multistage explosion, a fracture network in the coal body can be fully constructed; besides, the adsorption potential of gas can be remarkably reduced and the desorption and the flowing of the gas are promoted by the heat effect generated by explosion, so that the aim of enhancing the gas extraction of a coal bed with high-concentration gas and low permeability is achieved. The enhanced extraction method has the advantages of low cost, simplicity, feasibility, time conservation and force conservation; the influence range of effective pressure relief of single holes can be remarkably widened, and the extraction rate of the gas in the coal bed is increased by over 60 percent.

The invention belongs to the field of nanomaterials, and discloses a nickel-cobalt bimetallic phosphide electrocatalyst as well as a synthesis method and an application thereof. The Prussian blue analogue precursor synthesized through simple aging reaction is further subjected to low-temperature phosphating reaction, and a NiCoP multi-hollow porous nanocube electrocatalyst is obtained. The seriesof bimetallic phosphides have lower charge transfer resistance and reaction barrier for oxygen evolution reaction, and have superior performance in electrocatalytic oxygen evolution reaction. Besides,the catalyst is low in cost and convenient to operate, adopts a simple process and has superior catalytic performance, and basic application research is provided for the materials in the field of electrocatalysis.

The invention discloses a multi-metal MOFs derived oxygen reduction/oxygen evolution double-function catalytic material, and a preparation method thereof. The preparation method comprises following steps: room temperature coprecipitation is adopted to synthesis a Zn/Co/Fe multi-metal ZIF precursor; then sulfuration and sintering treatment technology is adopted for combination of oxygen reduction reaction (ORR) active sites (Co/Fe-N-C) and oxygen evolution reaction (OER) active sites (Co/Fe-S) on a monomer material, so that the double ORR/OER electrocatalyst which is low in cost and possesses the performance as good as that of commercially available catalysts is obtained. According to the preparation method, two important factors, including active site distribution and catalytic mechanism,with great influences on material performance are taken into comprehensive consideration, realization of the optimal material catalytic oxidation reduction/oxygen evolution reaction efficiency is taken as a design principle, optimization design is adopted to obtain the best Zn/Co/Fe ratio in the precursor, and the catalyst is provided with the best catalytic performance. The multi-metal MOFs derived oxygen reduction/oxygen evolution double-function catalytic material possesses both high efficiency oxygen reduction and oxygen evolution performance, is high in specific surface area, is abundantin micropores, and is uniform in active site dispersion; and the cost is much lower than that of commercially available precious metal catalyst catalytic materials.

The invention discloses a biomass-based nanometer lanthanum oxide dephosphorization composite adsorbent and a preparation method thereof. According to the composite adsorbent, biomass anion exchange resin is taken as a matrix, and nanometer lanthanum oxide is loaded on the biomass anion exchange resin; the load of the nanometer lanthanum oxide is 0.5 to 22.6 percent by weight percentage of lanthanum; the biomass anion exchange resin is alkali quaternary ammonium group-contained biomass anion exchange resin, and is prepared by performing aminated modification on a biomass material by taking N,N-dimethylformamide as solvent, epichlorohydrin as an etherifying agent and trimethylamine or triethylamine or urea as an aminating agent; the biomass material is selected from maize straw, soybean straw, cassava straw, rice straw, wheat straw, bamboo reed, saw dust or a mixture thereof. The composite adsorbent disclosed by the invention is low in cost and high in adsorption capacity.

The invention relates to the detection of vitamin D metabolites. In a particular aspect, the invention relates to methods for detecting derivatized vitamin D metabolites by mass spectrometry.

The invention provides a new method for preparing high purity chlorogenic acid, comprising the steps: after the stock solution of the chlorogenic acid is processed by washing impurity and eluting through at least four levels of macroporous resin series connection adsorption column, and then the eluate is regenerated for continuous countercurrent extraction, so that the high purity chlorogenic acid is obtained. The method is applicable to light concentration stock solution of the chlorogenic acid, and can complete the process of absorbing, washing impurity, eluting, regenerating, countercurrent extracting and recycling the solvent in a semicontinuous way; the handling capacity of samples is large, the operation is simple, the production cost can be lowered, the residual organic solvent is reduced, and the environmental pollution is relieved.

The invention relates to a catalyst for directly preparing a low-carbon olefin from a microspherical synthesis gas, and is mainly used for solving the problems that the existing co-precipitation Fischer-Tropsch catalyst preparation technology comprises the following steps: firstly co-precipitating and then pulping and spray-forming, so that the slurry is substantially a non-homogenous body dispersed by adopting a physical method, the finial catalyst finished product is uneven and the hydrocarbon products on the catalyst are widely distributed. The problems are well solved by adopting the technical scheme that the preparation method comprises the following steps: firstly precipitating a part of components, then carrying out peptization on the obtained precipitates by using the salt solution of non-precipitated components to obtain chemically evenly dispersed sol, then spray-drying the sol, and then roasting at high temperature. The preparation method can be used for industrial production for a catalyst for synthesizing the low-carbon olefin from the synthesis gas. The catalyst is applicable to but not limited to such reactors as a fluidized bed and a slurry-state bed in which catalyst grains are required to be distributed according to the certain distribution rule.

Methods are provided for detecting the amount of one or more CAH panel analytes (i.e., pregnenolone, 17-OH pregnenolone, progesterone, 17-OH progesterone, dehydroepiandrosterone (DHEA), androstenedione, testosterone, deoxycorticosterone, 11-deoxycortisol, and cortisol) in a sample by mass spectrometry. The methods generally involve ionizing one or more CAH panel analytes in a sample and quantifying the generated ions to determine the amount of one or more CAH panel analytes in the sample. In methods where amounts of multiple CAH panel analytes are detected, the amounts of multiple analytes are detected in the same sample injection.