333 results about "Methanol water" patented technology

The invention provides a PVDF (Polyvinylidene Fluoride) nanofiltration membrane constructed on the basis of microwave-enhanced bridging interfacial polymerization as well as a preparation method and application of the PVDF nanofiltration membrane. The method comprises the following steps: reacting PVDF powder with an organic alkali to prepare a modified film-forming solution, blade-coating the modified film-forming solution on a non-woven fabric supporting layer, placing the non-woven fabric supporting layer in an ethanol-water or methanol-water coagulating bath, and preparing a PVDF supporting film by virtue of assistance of an ice template; weighing the functionalized nano material and an amino silane coupling agent, performing ultrasonic dispersion, and adding a catalyst for reaction to obtain dispersion liquid; immersing a PVDF support membrane into the dispersion liquid to obtain a modified membrane; immersing the modified membrane into an aqueous solution containing an amine monomer and an organic solution containing an acyl chloride monomer, and carrying out microwave radiation. The interface reaction rate and selectivity are enhanced through the microwave excitation effect, and meanwhile, the hydrophilicity and reaction activity of the PVDF base membrane are cooperatively regulated and controlled, so that the separation efficiency and the anti-pollution capacity of the membrane are remarkably improved. The obtained PVDF nanofiltration membrane has high flux, high selectivity and excellent structural stability, and is suitable for efficient purification and resource recovery application in a complex water system.

The present application relates to hydrogen production technology field, especially to a kind of methanol hydrogen production method, comprising the following steps: S10: methanol water is heated and vaporized to obtain methanol water vapor;S20: methanol reforming reaction obtains hydrogen mixture gas;S30: after cooling treatment to hydrogen mixture gas, through water washing tower absorption unreacted methanol water, then, adjust the relative humidity and temperature of hydrogen mixture gas;S40: hydrogen mixture gas is input into carbon dioxide absorption tower to remove carbon dioxide;S50: after removing carbon dioxide, product hydrogen is obtained and input hydrogen tank storage to supply user end.The above-mentioned methanol hydrogen production method, by methanol water vapor reforming hydrogen treatment, obtains hydrogen mixture gas.Again, hydrogen mixture gas is purified to obtain product hydrogen with very low carbon monoxide content, with raw material easy to transport, the hydrogen purity of output is high, equipment construction cost is low, and energy consumption is low and the like advantages, reach the purpose of expanding hydrogen application range.

The invention relates to a detection method for determining isotope abundance of a 15N or 18O labeled nitrate sample by using an organic mass spectrum. The detection method comprises the following steps: (1) dissolving the 15N or 18O labeled nitrate sample in a methanol aqueous solution; (2) taking the supernatant, filtering with a filter membrane, and diluting with a methanol aqueous solution to obtain a solution to be detected; and (3) detecting the solution to be detected by using a high-resolution liquid chromatograph-mass spectrometer, selecting a mass spectrum in a peak appearance time window, recording relative mass spectrum signal intensities with mass-to-charge ratios of 61.988 and 62.985, and calculating to obtain the 15N isotope abundance. Or recording the relative mass spectrum signal intensities with the mass-to-charge ratios of 61.988, 63.993, 65.997 and 68.001, and calculating to obtain the abundance of the < 18 > O isotope. Compared with the prior art, the method has the advantages that the sample pretreatment time is greatly shortened, the economic cost is low, and the test result is accurate.

The invention relates to a methanol internal combustion engine high-temperature fuel cell hybrid power system based on double-path waste heat gradient utilization. The invention relates to the technical field of internal combustion engine waste heat recovery and new energy power system integration. The system comprises a fuel tank, a first pump body, a heat exchanger, a methanol internal combustion engine, a turbine, a gas compressor, an air compressor, a reformer, a high-temperature proton exchange membrane fuel cell, an evaporator and a second pump body. A methanol-water vapor mixture generated by heat exchange of a mixed solution of methanol and water and a high-temperature fuel cell stack coolant in a heat exchanger is introduced into a reforming reactor and is subjected to catalytic reforming to produce hydrogen by utilizing waste heat of high-temperature tail gas of an engine, and the produced hydrogen is directly supplied to an anode of a high-temperature fuel cell. Through a double-path methanol distribution strategy, collaborative design of internal combustion engine waste heat recovery, electric pile heat management and reforming hydrogen production is realized, and the comprehensive energy efficiency of the system is improved.

The invention relates to a modular methanol reforming hydrogen production system, and belongs to the technical field of new energy of methanol reforming hydrogen production. The hydrogen production system comprises a control system, an air inlet module, a methanol supply module, a plurality of methanol reforming hydrogen production modules, a reformed gas main pipeline and a tail gas main pipeline, wherein the methanol reforming hydrogen production module comprises a methanol reformer, a tail gas heat exchanger, a methanol evaporator, a methanol aqueous solution sub-feeding pump, a methanol aqueous solution sub-pipeline, a reformed gas sub-pipeline and a tail gas sub-pipeline; the methanol reformer comprises a vaporizing chamber, an oxidizing chamber and a reforming chamber; an outlet of high-temperature tail gas generated by the oxidizing chamber is connected with the tail gas heat exchanger and the methanol evaporator; and the methanol aqueous solution main storage tank is sequentially connected with the methanol evaporator, the tail gas heat exchanger and the reforming chamber through a methanol aqueous solution feeding pump. The methanol reforming hydrogen production system adopts a modular design, is simple in equipment, high in expansibility, quick to start and adjustable in hydrogen production amount, and realizes instant production and instant use of hydrogen energy and hydrogen.

The invention discloses a sialic acid molecular imprinting extraction method, and belongs to the technical field of separation and purification. The invention discloses a sialic acid molecular imprinting extraction method which comprises the following steps: dissolving a sialic acid standard substance and a functional monomer in a binary pore-foaming agent-ionic liquid, adding a cross-linking agent and an initiator, polymerizing under ultraviolet light to prepare a high-molecular polymer, and washing off the sialic acid standard substance to prepare a molecular imprinting polymer; specifically adsorbing sialic acid in the fermentation liquor by using the molecularly imprinted polymer; performing graded elution on sialic acid by using a methanol-water mixed solution and a methanol-acetic acid mixed solution; and performing rotary evaporation concentration, anti-solvent crystallization, separation and drying on the bird's nest acid eluent. Tests show that the sialic acid purity is greater than or equal to 99%, and can meet the requirements of the sialic acid in the fields of food, health care, medicine, cosmetics and the like. According to the method, sialic acid can be efficiently separated and extracted from sialic acid fermentation liquor, the product yield is increased, the extraction procedures are reduced, and the production cost and the discharge amount of three wastes are reduced.

The invention relates to the technical field of radiation refrigeration films, and discloses a porous polyvinylidene fluoride based composite radiation refrigeration film and a preparation method thereof. The method comprises the following steps: firstly, carrying out melt blending on PVDF, NaCl and ZnO nanoparticles and forming a film, then dissolving out NaCl through water washing, and constructing a continuous three-dimensional porous structure in a PVDF matrix; and immersing the obtained porous PVDF / ZnO membrane material into a methanol aqueous solution containing 2-methylimidazole, so that ZnO is subjected to a coordination reaction at the pore wall and is converted into the ZIF-8 nanocrystal in situ. In the thin film prepared by the steps, the micron-sized salt-induced pore structure, the nano-sized ZIF-8 particles and the interface of the ZIF-8 particles jointly form a multi-stage scattering network, so that the scattering ability of the thin film in the solar spectrum range of 0.25-2.5 microns can be remarkably enhanced, the high infrared emission performance of the PVDF matrix in an atmospheric window of 8-13 microns is maintained, and the thin film has high solar reflectivity and high infrared emissivity, and can be used for preparing the solar film. An excellent radiation refrigeration effect can be achieved, and the heat-dissipating material is suitable for being applied to building outer surfaces, equipment heat dissipation, individual heat management and the like.

The invention relates to a modular methanol reforming and high-temperature membrane fuel cell coupled heat and power cogeneration system, which comprises a modular methanol reforming hydrogen production system, a modular high-temperature membrane fuel cell power generation system and an electric control system, and is characterized in that the modular methanol reforming hydrogen production system comprises a methanol reforming hydrogen production module, a methanol aqueous solution main pipeline and a tail gas main pipeline; the number of the methanol reforming hydrogen production modules is multiple, the methanol aqueous solution main pipeline is connected with the methanol reforming hydrogen production modules, and the methanol reforming hydrogen production modules convey obtained reformed hydrogen to the high-temperature fuel stack module; the high-temperature membrane fuel cell power generation module supplies power according to electric energy generated by reforming hydrogen; the electric control system is connected with the methanol reforming hydrogen production module, a temperature alarm value and a starting temperature value are set, the methanol reforming hydrogen production module is closed when the actual temperature of the methanol reforming hydrogen production module exceeds the temperature alarm value, the methanol reforming hydrogen production module is restarted when the actual temperature is lower than the corresponding starting temperature value, and the power supply cost can be reduced.

The invention belongs to the technical field of teenager depression marker detection, and particularly relates to a teenager depression marker detection kit and a teenager depression marker detection method, the kit comprises an extraction liquid, an internal standard substance, a quality control substance and a mobile phase additive, the internal standard substance comprises a stable isotope labeled metabolic marker, the quality control substance comprises a standard metabolic marker, and the mobile phase additive comprises a mobile phase. The detection method comprises the following steps: S1, dissolving an internal standard substance by using a methanol-containing aqueous solution to prepare an internal standard stock solution; s2, methanol is added into the internal standard stock solution for dilution, uniform mixing is performed, and an extraction working solution is prepared; s3, taking a quality control product / sample, adding an extraction working solution, carrying out oscillation incubation, centrifuging, and taking supernate as a to-be-detected sample; s4, the sample to be detected is detected through a liquid chromatograph-mass spectrometer, various biomarkers related to depression in the body of the teenager can be rapidly and accurately detected, and an objective and reliable basis is provided for early diagnosis and illness state evaluation of the depression of the teenager.

The invention discloses a methanol water reforming hydrogen production method, and relates to the technical field of hydrogen energy preparation, and the method comprises the following steps: 1) catalytic reforming reaction; and 2) separation and purification. The preparation method comprises the following steps: performing nitrogen doping modification on activated carbon by a hydrothermal method to prepare an N-AC carrier; then Co is preferentially anchored to the carrier at low temperature by utilizing the steric hindrance effect of a cobalt-ammonia complex, and a highly dispersed CoxOy active center is formed through thermal decomposition; and finally, co-dipping Cu and Zn precursors, precipitating and reducing to form a Cu-Zn active center, and constructing a Cu-Zn-CoxOy / N-AC bifunctional concerted catalytic system which is used for hydrogen production by reforming methanol and water. After methanol and desalted water are mixed and gasified, the mixture is introduced into a reforming reactor loaded with a Cu-Zn-CoxOy / N-AC catalyst for reaction, generated reformed gas is subjected to cooling and gas-liquid separation and then is purified through a CO adsorption bed and a pressure swing adsorption system, and high-purity hydrogen is obtained.

The invention belongs to the field of liquid chromatography-mass spectrometry detection, and discloses a liquid chromatography-mass spectrometry detection method for trace target objects in seawater, which comprises the following steps: firstly, configuring and precisely calibrating parameters such as flow velocity, column temperature, ion source voltage and the like for a liquid chromatography system, a chromatographic column, an automatic sampler and a tandem mass spectrometer; then, a methanol-water (containing 0.1% formic acid) system is adopted to implement linear gradient elution, polar difference component separation is considered, and analysis duration is compressed; a sample is subjected to solid-phase extraction, purification and concentration, then is automatically injected, is subjected to chromatographic separation and then enters an electrospray ion source; a mass spectrum end selects a dynamic multi-reaction monitoring (dMRM) mode, characteristic ion pairs are collected in a preset time window, and selective scanning and baseline noise suppression are achieved; and finally, utilizing retention time matching and internal standard correction to obtain a pg.L <-1 > magnitude quantitative result.

The utility model discloses a hydrogen production and power generation coupling system based on methanol concentration difference, which relates to the technical field of methanol electrolysis hydrogen production and comprises a methanol electrolysis hydrogen production reactor, a methanol water supply unit, a direct methanol fuel cell and an energy storage cell, the methanol water supply unit provides methanol water required by hydrogen production for the methanol electrolysis hydrogen production reactor, and a water outlet of the methanol electrolysis hydrogen production reactor is communicated with a water inlet of the direct methanol fuel cell, so that low-concentration methanol water output by the methanol electrolysis hydrogen production reactor is input into the direct methanol fuel cell for power generation; the direct methanol fuel cell, the energy storage cell and the methanol electrolysis hydrogen production reactor are sequentially in circuit connection. According to the methanol electrolysis hydrogen production reactor, the high-concentration methanol aqueous solution is used for electrolysis hydrogen production, the output low-concentration methanol aqueous solution serves as a raw material for power generation of the direct methanol fuel cell, the direct methanol fuel cell generates power and then supplies the power for hydrogen production of the methanol electrolysis hydrogen production reactor, an external power source is not needed for power supply, and the system efficiency is high.

The application discloses a kind of ruthenium grafting manganese aluminum hydrotalcite and catalytic method for C02 hydrogenation preparation formic acid, belong to catalyst technical field, in the application, under the optimized reaction condition, with methanol:water mixture as solvent (5:1), total pressure is 60bar, 60 DEG C, reaction 24 hours, with temperature controller to be heated to the temperature required for reactor.When the temperature inside the reactor reaches the specified temperature, start stirring at a fixed stirring speed (200-800 revolutions / min), after the required reaction time, stop stirring and heating, and allow the reactor to cool to room temperature. The hydrogenation products were analyzed by high performance liquid chromatography, the conversion number (TON) of formic acid reached more than 8000; RuMnAl-LDH was prepared by coprecipitation method, and RuMnAl hydrotalcite catalyst was obtained by heating and activation in a muffle furnace. The preparation process is simple, and the raw materials are easy to obtain. The RuMnAl-LDH catalyst prepared by the application has good catalytic activity and stability in the catalytic hydrogenation of formic acid to formic acid reaction, and has wide application prospect.

The invention belongs to the technical field of methanol hydrogen production, and discloses a process for catalytic heating coupling methanol hydrogen production. The process comprises the following steps: S1, providing a methanol cracking hydrogen production system; and S2, carrying out methanol steam reforming hydrogen production treatment based on a methanol cracking hydrogen production system. And S3, carrying out pressure swing adsorption treatment on the methanol decomposition gas prepared in S2 to obtain desorbed gas and purified hydrogen. S4, purified hydrogen flows through a product gas buffer tank with a filter element and then is fed into a gas using section. And S5, feeding the desorbed gas into a catalytic oxidation reactor for recovery treatment, and supplying released heat energy to a methanol cracking hydrogen production system for use. According to the invention, the organic combination of catalytic oxidation and methanol cracking hydrogen production is realized, the problems that the existing methanol hydrogen production process needs to discharge combustible tail gas and is unsafe and not environment-friendly are solved, extra fuel is not needed in the whole hydrogen production process, and only methanol needs to be provided; the method has the remarkable advantage of zero consumption of natural gas, diesel oil, coal and other fuels.

The application discloses a preparation method and application of a low-Cu-loading high-activity methanol reforming hydrogen production catalyst. The catalyst takes Al2O3 as a carrier, Cu as an active component, and Ce as an additive, is synthesized by a coprecipitation method in one step, and realizes the synergistic effect of the active metal, the additive and the carrier by precisely controlling the Cu loading to be 5-15%, the Ce doping amount to be 1-5%, and combining specific precipitation, calcination and reduction processes; the dispersion degree and the low-temperature catalytic performance of Cu are improved by using the redox electron regulation formed by CeO2 and Al2O3 and the strong metal carrier interaction. Without doping of noble metals, the raw material cost is reduced, meanwhile, the catalyst has excellent mechanical strength, the long-period reaction performance does not attenuate for 300 hours, is suitable for a fixed-bed reforming reactor, can be efficiently applied to a methanol steam reforming hydrogen production reaction, and has remarkable industrial application value.

The utility model discloses an anti-corrosion control system for a low-temperature methanol washing process, which comprises an alkali liquor adding tank used for storing and preparing alkali liquor with the concentration of 2%; the alkali liquor filling pump is connected to the alkali liquor dosing tank and is used for conveying the prepared 2% alkali liquor to an ammonia washing tower and a methanol-water separation tower in the production system; the alkali liquor dosing tank liquid level meter is arranged on the alkali liquor dosing tank and is used for monitoring the liquid level in the alkali liquor dosing tank in real time and sending out an alarm and interlocking protection signal; the DCS control system is used for automatically controlling the supplement amount of alkali liquor according to preset program setting and ensuring safe operation, the alkali liquor filling pump and the alkali liquor dosing tank liquid level meter are both connected with the DCS control system, 1-2% of alkali liquor is supplemented through online continuous operation, the PH value of condensate of the methanol-water separation tower and the ammonia washing tower is controlled to be 7-8, and therefore the problem of equipment corrosion is solved.

The application discloses a cold-heat-electricity-hydrogen-carbon co-production system and method based on cross-critical carbon dioxide energy storage, and the method is as follows: carbon dioxide is compressed by a carbon dioxide compressor set and then enters an expander set to work and generate electricity; heat energy generated in the carbon dioxide compression process provides heat for a methanol water vapor reforming hydrogen production process and a methanol cracking hydrogen production process through a first heat exchanger and a second heat exchanger respectively; a solar power generation unit generates electricity to provide electric energy for the carbon dioxide compressor set, a methanol water vapor reforming hydrogen production reactor and a methanol cracking hydrogen production reactor; carbon dioxide generated in the methanol water vapor reforming hydrogen production is input into the carbon dioxide compressor set; carbon monoxide generated in the methanol cracking hydrogen production is combusted to generate high-temperature flue gas, and the high-temperature flue gas provides heat for the expansion of compressed carbon dioxide in the expander set; the carbon dioxide compression provides heat energy for a hydrogen production reaction of methanol, and solar power generation provides electric energy for the hydrogen production of methanol, so that the system energy consumption is reduced, and carbon monoxide is consumed in the system.

The application discloses a kind of oxygen vacancy promotes methanol carbon-carbon coupling ethane production method, comprising the following steps: synthesizing H2Ti4O9;The obtained H2Ti4O9 is stripped into colloidal sheet, obtains two-dimensional TiO2 nanosheet;Hydrogenation treatment obtains the TiO2 nanosheet with oxygen vacancy;The TiO2 nanosheet with oxygen vacancy is dissolved in methanol / water solution, drop into H2PtCl6 solution, solution is in vacuum state, then it is irradiated with arc lamp while stirring N1 hour, obtain brown white precipitate, after washing vacuum drying catalyst is obtained;Methanol / water solution is placed into reactor, catalyst is uniformly dispersed in methanol / water solution, when reaction, first the reactor is evacuated to remove air, then xenon lamp is opened to carry out illumination, after reaction, obtain ethane.The application uses the TiO2 nanosheet with oxygen vacancy as catalyst to produce ethane, and a large number of oxygen vacancies increase a large number of methanol dissociation sites, thereby reducing the distance between adjacent methoxyl groups, and then promoting coupling to generate ethane.

The present application relates to the technical fields of chemical synthesis, and discloses a kind of aviation kerosene production process and equipment, production process includes: carbon source gas, hydrogen, circulating gas is sent into main reactor reaction and obtains including hydrocarbon, methanol, CO, water and unreacted gas mixed component a;Mixed component a is sent into cascade reactor and is prepared to obtain including aviation kerosene component, light hydrocarbon component and water mixed component b, wherein light hydrocarbon component includes one or more of C2-C7 light hydrocarbon;Mixed component b is fractionally condensed to collect liquid phase and gas phase, and liquid phase is carried out three-phase separation to obtain aviation kerosene component, light hydrocarbon component and water respectively, aviation kerosene component is hydrotreated, fractionation to obtain aviation kerosene.The present application realizes the step-by-step control of reaction path in carbon source hydrogenation process through the synergistic effect of main reactor and cascade reactor, improves the selectivity of aviation kerosene target product, so that the obtained product meets the 3# aviation kerosene standard requirements in key indicators such as distillation range distribution, aromatic content and low temperature performance.

The invention discloses a crystal form and a preparation method of Alalistrum hydrochloride, the crystal form comprises a crystal form Form3, a crystal form 4 and a crystal form Form11, Alalistrum hydrochloride solids Form3 (methanol-water composite solvate), Form4 (hydrate) and Form11 can be obtained by mixing and dissolving Alalistrum hydrochloride solids and an organic solvent, and then adopting the modes of crystallization, crystal mush and volatilizing, and the Alalistrum hydrochloride solids Form3 (methanol-water composite solvate), Form4 (hydrate) and Form11 can be obtained by using the crystal form of Alalistrum hydrochloride and the preparation method of the crystal form of Alalistrum hydrochloride and the preparation method of the crystal form of Alalistrum hydrochloride. The preparation method disclosed by the invention is simple in process, strong in operability, high in yield, high in purity and good in crystallinity, and the crystal form disclosed by the invention is high in solubility, few in residual solvent and good in solid property and meets the medicinal development standard.

The invention discloses an on-line regeneration method of a copper-based methanol reforming hydrogen production catalyst, which belongs to the technical field of catalyst regeneration, and is characterized by comprising the following steps: directly adding a certain proportion of oxygen-containing gas into feed gas of a reactor in a methanol reforming hydrogen production reaction process under the conditions of not changing the operation temperature and not stopping raw material supply; oxygen-containing gas is mixed with methanol and water vapor and then enters a catalyst bed layer, and after online treatment is carried out for a period of time, supply of oxygen is stopped, so that online regeneration of catalyst activity can be completed; according to the method, the regeneration can be completed by directly introducing oxygen in the reaction process without shutdown, cooling or reaction atmosphere switching, so that the operation process is greatly simplified, and the production efficiency is improved.

The application discloses a compression ignition type methanol engine and a control system thereof, and relates to the technical field of engine control, which comprises a methanol engine and a methanol tank, further comprises a methanol water boiler, and is provided with an electric heating plug at a cylinder of the methanol engine; the methanol tank is connected with the methanol water boiler, a first methanol pump and a second methanol pump through connecting pipelines respectively; control valves one, two and three are arranged on the connecting pipelines respectively; the control system of the compression ignition type methanol engine comprises a cold start and warm-up working condition identification module, an acceleration working condition identification module, a load working condition identification module and an engine control module; the high-efficiency and reasonable heat management system and the air intake passage / in-cylinder double-methanol injection supply technology are adopted, the methanol engine can be operated efficiently in all working conditions, the efficiency and the power of the methanol engine can be improved simultaneously, and the effect of the high-efficiency and high-power compression ignition type methanol engine is realized.

This invention relates to a BYD (1,4-butynediol) distillation process and system, solving the problems of high energy consumption and high steam and circulating water consumption in existing BYD distillation processes. The distillation process includes a mixed solution containing 1,4-butynediol, methanol, water, and formaldehyde from an acetylation reactor, which is preheated in a feed preheater and then fed into a stripping tower for stripping. The liquid at the bottom of the stripping tower is drawn off through the liquid phase outlet and sent to the feed preheater for indirect heat exchange with the mixed solution. It is then further cooled by the stripping tower bottom outlet cooler to obtain the BYD product for external delivery. The vapor phase from the top of the stripping tower is drawn off through the vapor phase outlet, first sent to a compressor for pressurization and heating, then sent to the stripping tower reboiler for heat recovery, and then enters the stripping tower reflux tank, before being pumped to the alcohol distillation tower. This invention features a simple process, energy saving and consumption reduction, low operating costs, effective recovery of top heat energy, significant savings in cooling water, and high product concentration.

The utility model discloses a methanol reforming hydrogen production device based on solar energy and tail gas utilization, which relates to the field of new energy utilization and chemical production and comprises a solar heat collector and a methanol reforming reactor. The solar heat collector comprises a groove type paraboloid collecting lens, sunlight irradiates the collecting lens and is reflected to a focus point, and the methanol reforming reactor is located at the light reflection focus point of the groove type paraboloid collecting lens; the methanol reforming reactor comprises an aluminum alloy pipe, a tail gas flow pipe, a methanol reforming pipe, a gas inlet pipe and a gas outlet pipe; the tail gas flow pipe is nested in the aluminum alloy pipe, a plurality of methanol reforming pipes are distributed in an interlayer between the tail gas flow pipe and the aluminum alloy pipe, and the gas inlet pipe and the gas outlet pipe are communicated with all methanol reforming pipes; the aluminum alloy pipe absorbs heat generated by sunlight, and the tail gas flow pipe absorbs waste heat of tail gas circulating in the tail gas flow pipe to jointly supply heat to the methanol reforming pipe; methanol steam enters the methanol reforming pipe from the gas inlet pipe, reacts in the methanol reforming pipe to generate hydrogen-rich reforming gas, and is discharged from the gas outlet pipe.

The application belongs to the technical field of detection, and particularly relates to a method for determining the content of chlorhexidine acetate in a disinfectant. The method for determining the content of chlorhexidine acetate in the disinfectant comprises the following steps: (1) dispersing the sample with glacial acetic acid, releasing chlorhexidine acetate combined with sample matrix components, and extracting with a methanol aqueous solution; and (2) taking a tetrabutylammonium bromide-acetic acid-acetonitrile solution as a mobile phase, and detecting with a high-performance liquid chromatograph. The method for detecting chlorhexidine acetate is simple in operation, good in reproducibility, complete in separation from impurities, high in accuracy, and has a good application prospect.

The utility model belongs to the technical field of methyl tert-butyl ether cracking, and particularly relates to a device for producing isobutene by cracking methyl tert-butyl ether. The device for producing isobutene by cracking methyl tert-butyl ether comprises an MTBE refining tower, the MTBE refining tower is connected with a cracking reactor, the bottom of the cracking reactor is sequentially connected with a condensate water cooler and a circulating water cooler, the circulating water cooler is connected with an absorption cooling tower, the absorption cooling tower is connected with a compressor inlet buffer tank, and the compressor inlet buffer tank is connected with a compressor outlet buffer tank. The compressor inlet buffer tank is connected with the gas production compressor; and the gas production compressor is connected with the isobutene water washing tower. According to the device for producing isobutene by cracking methyl tert-butyl ether, the condensate water cooler and the circulating water cooler are arranged and are matched with the light component removal tower reboiler, so that the cyclic utilization of heat is realized, and the energy consumption of the device is reduced; meanwhile, the isobutene water washing tower and the methanol water collecting tank are arranged, so that the loss of methanol is reduced, and the purity of an isobutene product is improved.

The invention relates to a methanol steam reforming hydrogen production device and a quick starting method thereof, and belongs to the technical field of hydrogen energy preparation devices. The hydrogen production device comprises a methanol reformer, a tail gas heat exchanger, a methanol evaporator, a methanol feeding pump, a methanol aqueous solution pipeline, a reformed gas pipeline, an air pipeline and a tail gas pipeline, the methanol water solution pipeline comprises a first pipeline and a second pipeline; the methanol reformer comprises a methanol oxidizing chamber, a methanol vaporizing chamber and a methanol reforming chamber; the methanol reformer is connected with the first pipeline through a methanol feeding pump; the methanol reformer is respectively connected with an air pipeline and a reformed gas pipeline; the methanol reformer is sequentially connected with the tail gas heat exchanger and the methanol evaporator to form a secondary heat exchange structure; and the methanol evaporator is sequentially connected with the tail gas heat exchanger and the methanol reformer through a second pipeline for multi-stage heat recovery. A detachable hydrogen storage device is connected outside a methanol oxidation chamber of the hydrogen production device, and the hydrogen production device can be quickly started by utilizing hydrogen-air catalytic combustion during starting.

The application discloses a foamed copper low-temperature methanol water vapor reforming hydrogen catalyst and a preparation method thereof, and belongs to the technical field.The technical scheme is as follows: including pretreatment, chemical plating reaction, impregnation, pre-copper plating, copper electroplating, calcination, hydrothermal reaction and high-temperature treatment.The foamed copper catalyst prepared by the application has the advantages of more uniform dispersion of active components, higher porosity and better stability;Al does not need to be added, and the active component is the carrier;and the preparation process is simple, convenient to operate, low in cost and obvious in industrial application value.

The invention discloses a solid fluorescent material based on a tetraphenylethylene derivative and application of the solid fluorescent material in water content detection. On the basis of the special structure and functional design of a hydrogen bond organic framework, the spatial distribution and interaction mode of structural solvents (such as dimethyl sulfoxide and DMSO) and adsorption solvents (such as methanol, water and acetone) in the framework are accurately controlled, and on the premise that the integrity of a crystal structure is kept, the preparation method is simple and easy to implement. And reversible exchange and real-time optical monitoring of solvent molecules in the pore channels are realized. The material can generate obvious fluorescence color change (467-602nm) along with the change of the environmental water content, and has the advantages of high response speed, high sensitivity, good thermal stability and good recycling performance.

The utility model discloses a diffusion gradient film shell which comprises a sampler shell assembly, the sampler shell assembly comprises a base, a threaded column fixed on the base, a protective cover matched with the threaded column, a conical cover connected with the protective cover, and a filter membrane, a diffusion layer and an adsorption layer which are arranged between the threaded column and the protective cover. According to the utility model, the sampler shell assembly is arranged to form a threaded connection structure, so that the sampler shell does not need to be pried open when the adsorption film is recycled, the effect of repeated utilization can be achieved through simple methanol water cleaning, experimental resources are effectively saved, experimental wastes are reduced, and the experimental cost is reduced. And the structural design of the octagonal base is convenient to apply force to screw, the shell can be set into different colors, and the shells with the same color form one group, so that the marking is convenient.