715 results about "Cold trap" patented technology

The invention relates to a natural tea essence prepared by using tea and a preparation method thereof. The tea is taken as a raw material; high-purity natural tea essences with different tea aroma characteristics are prepared through compound enzymolysis, releasing, steam distillation under reduced pressure, cold trap recycling, low temperature freezing concentration, centrifugal oil-water separation, and trace moisture adsorption by using anhydrous sodium sulfate; and the compound enzymolysis and the releasing are realized by adding pectinase, cellulase or pectinase and cellulose complex enzyme, and beta-glucosidase. In the preparation method, a pectinase and cellulose complex enzyme method is adopted for enzymolysis to facilitate cracking cell walls of the tea so as to facilitate liberation and separation of aroma components from the tea, and improve the yield of the essence; therefore, the method is a method for industrially producing the natural tea essence which is energy-saving, low in cost, environmentally friendly and high in efficiency.

The invention relates to electronic cigarettes, in particular to a method for applying tobacco subjected to dry distillation pyrolysis to a novel tobacco product to obtain an extract with sensual pleasures and psychological intensity similar to those of traditional cigarettes. The method for preparing electronic cigarette nicotine liquid by means of tobacco subjected to dry distillation pyrolysis comprises the steps of weighing tobacco, placing tobacco in a heating furnace, increasing temperature to 150-1000 DEG C, introducing carrier gas, introducing smoke generated from pyrolysis into an absorption bottle, placing the absorption bottle in a cold trap, conducting smoke collection with an electronic cigarette solvent, washing smoke condensation products in a pipeline out by means of collection liquid, and obtaining smoke extraction solution. The electronic cigarette nicotine liquid has the advantage that sensual pleasures and psychological intensity similar to those of traditional cigarettes are obtained.

The invention discloses a liquid metal sodium boiling two-phase thermal-hydraulic test loop system and a test method thereof. The loop system is divided into three parts comprising a high temperature part, a low temperature part and an argon branch, wherein the low temperature part comprises a sodium storage tank, an electromagnetic pump, an electromagnetic flowmeter, a purification cold trap, four sodium valves and corresponding connecting pipelines; the low temperature part is made of 316L stainless steel; the high temperature part comprises a regeneration heater, a preheater, a test section, an upper expansion box and corresponding connecting pipelines; the high temperature part is made of Incoloy 800 and allows the operating temperature to reach 1,200 DEG C; and the argon branch comprises an argon bottle, an expansion pressure stabilizing box, a vacuum pump, three pressure gauges, ten vacuum diaphragm valves and corresponding connecting pipelines. The system is suitable for operating at high temperature, has a good sealing property and can realize analysis and research on the liquid metal sodium boiling two-phase heat exchange flow characteristic by adding different test sections and a data acquisition system.

The invention discloses a device for preparing dripping pills, which adopts cold-air plus cold trap cooling gas The device is provided with a dripping pill machine, a cooling pipeline sealed and communicated with the dripping pill machine and an air cooling device which is communicated with the cooling pipeline and feeds cold air into the cooling pipeline circularly. The dripping pill machine is provided with a material melting pot communicated with a pipeline of material liquor feeding device, a dripper communicated with the material melting pot and an insulating cavity arranged outside the dripper to carry out heat preservation on the dripper. The dripper is a hopper-shaped structure the upper and lower parts of which are communicated and the dripper is provided with 1 to 4 layers with the same shape from the outside to the inside. 1 to 4 material pots are also provided. A cut is formed at a lower opening of the insulating cavity corresponding to the dripper and is sealed and connected with an upper port of the cooling pipeline. The invention simplifies the operation working procedures, has no remnant organic solvent and reduces the cost for preparing dripping pills. The device has no dead angles when cleaning and is convenient for washing, thus avoiding cross contamination during the manufacture process and being beneficial to the product stabilization..

The invention discloses a sampling analysis device for atmosphere volatile organic compounds. The sampling analysis device comprises a low-temperature environmental box and an atmosphere sampler, wherein low-temperature cold trap devices are arranged in the low-temperature environmental box and comprise a first cold trap, a second cold trap and a third cold trap, the first cold trap comprises a first condensation pipe and a first semiconductor chilling plate set, and a first heating wire is wound on the first condensation pipe; the second cold trap comprises a second condensation pipe and a second semiconductor chilling plate set, and a second heating wire is wound on the second condensation pipe; the third cold trap comprises a third condensation pipe and a third semiconductor chilling plate set. The invention further discloses a sampling analysis method for the atmosphere volatile organic compounds. The sampling analysis device and the sampling analysis method can meet requirements on the online monitoring of the contents of the volatile organic compounds and can be used for automatically detecting the contents of the atmosphere volatile organic compounds in an on-site and online manner.

The invention provides a method for preparing hexachlorobutadiene by using 1, 1- dibromo-tetrafluoroethane, comprising: zinc powder and aprotic polar solvent are added into a reactor I protected by inert gas to lead the temperature to reach 50-90 DEG C; the 1, 1- dibromo-tetrafluoroethane is added into the reactor I within 0.5-3.5h and then reacts for 1.5-5h at the temperature of 50-120 DEG C; after that, the zinc powder reacts with the 1, 1- dibromo-tetrafluoroethane to produce trifluoro-ethylene zinc bromide; the reactor I is cooled to be room temperature, and the solution in the reactor I is added into a reactor II containing catalyst and solvent at the temperature below 1-40 DEG C within 0.5-3h and then reacts for 1-7h at the temperature of 0-60 DEG C; after the reaction, the obtained product is collected by a liquid nitrogen cold trap. The invention has the advantages of short synthetic route, simple technique, high raw material conversion rate, high yield of product and high purity of crude product, so that the product is simple to separate and purify, and the environmental pollution is reduced.

The invention relates to a pretreatment method for measuring 14C abundance of an organic compound type sample. The method includes transferring carbon atoms in the organic compound into CO2 molecules through combustion, reacting CO2 with a NaOH solution to obtain a saturate NaHCO3 solution, heating the saturate NaHCO3 solution to obtain a saturate Na2CO3 solution, and adopting the saturate Na2CO3 solution for 14C abundance tests. The invention also provides a device used for the method. The device mainly comprises an oxygen cylinder, a nitrogen cylinder, a cold trap A, a three-way stopcock A, a combustion chamber, a cold trap B, a stone, a cold trap C, a three-way stopcock B, a conical flask, a cold trap D, a three-way stopcock C, a U-shaped gas sample collector, a three-way stopcock D, a vacuum gauge, a vacuometer, a piston D and a vacuum pump. On the basis of guaranteeing the measuring accuracy, the method largely simplifies the chemical treatment process, increases the time efficiency and reduced the cost.

The invention discloses a method for plating a parylene film on a surface of a LED chip. The method is characterized by comprising the following steps that a plating part LED chip is placed into a settling chamber; a film plating material parylene is placed into an evaporation chamber; the film plating material enters the settling chamber as activated monomers after vaporizing and cracking; a uniform and transparent parylene film is settled on the surface of the LED chip, wherein, the film plating device comprises a vaporization chamber, a cracking chamber, the settling chamber and a cold trap chamber. The method has simple process, convenient operation, strong film adhesive force and uniform film thickness, greatly improves the reliability, safety and service life of the product, solves the problems of water resistance, humidity resistance, high temperature resistance and acid-base corrosion of LED lighting products, and contributes to further popularization and application of LED brightening and electricity saving engineering.

The invention belongs to the measurement technical field of atmosphere environment quality, which specifically relates to an online automatic measuring system for environment air quality based on low-temperature condensing method sampling. The system is composed of a low-temperature condensing sampling system and an analyzing system; the low-temperature condensing sampling system comprises a drying pipe, an electronic cold trap and a low-temperature low trap that are connected in turn; the drying pipe is connected with an air inlet pipeline for removing vapor and condensing the environment air sample at low temperature; the analyzing system comprises a light source, a sampling battery, an optical spectrum instrument and a computer; the analyzing system splits and detects the air condensed by the sampling system through the optical spectrum instrument by the ultraviolet function from the light source and then analyzes the air by the computer. The system is high in integrated degree and measuring efficiency, which is suitable for continuous, real-time and online measurement of various pollutants of atmosphere environment (including sulfur dioxide, nitrogen dioxide, ozone, ammonia, formaldehyde and part of benzene series) in environment air.

The present invention relates to a process for preparing NF3 gas and its equipment. It is characterized by that the anodic electrolytic gas in the electrolytic cell is fed into a pressure balancing tank by means of pipe, then fed into a low pressure tank via regulating valve, and said gas is fed into a low-temp. cooling tower by means of pipe to remove high-boiling point impurities of NH4F and HFfrom said anodic electrolytic gas to obtain NF3 gas, then the NF3 gas is fed into an ultralow temp. cold trap to make liquification and collection, and remove low-boiling point impurities or N2 and O2 from it by adopting the measure of evacuating cold trap, after the NF3 gas is collected and liquified in the ultralow-temp. cold trap, heating the cold trap and distilling said NF3 gas and pressing it into crude NF3 gas storage tank, the material of anode in the electrolytic cell is high-purity nickel.

The instrument comprises carrier gas inlet, working gas inlet, other gas inlet, gas flow meter, mixer, the first and the second four-way valve, the first and the second six-way valve, saturator, heating furnace with programmed control temperature, sample tube with internal-inserted thermocouple, heat conductive pool, cold-trap, chromatographic column, hydrogen flame detector sampling and displaying of computer and spectrogram printing. The instrument with above devices can apply techniques of programmed temperature for reduction de-addendum, surface reaction, oxidation and decomposition as well as H2-O2 titration to carry on surface performance test for catalyst and to obtain spectrogram for each abovesaid performance of the catalyst.

The invention discloses a quantitative detecting method and a gathering device for measuring phosphine gas. The gathering device comprises a sampler, the sampler is connected with a cold trap column through a six-way valve, a first cold trap column is connected with a second cold trap column, the cold trap column is communicated with a chromatographic column. The detecting method is that the gas which is released after the sorption state phosphine is cleared up in a fixed method, then sampling according to a fixed operation, the sampling gas which is eliminated the acid gases and vapor through a NaOH absorption tube is entered into the gas chromatograph after gathering and removing impurities through the switching of the six-way valve in the two front column cold trap, reading the response signal of the nitrogen-phosphorus detector to integral, at last work out the concentration of the phosphine in the practical sample through comparing the area of the peak area of the sample and the phosphine standard gas chromatography. The invention has high sensitivity and low detecting limit, the time of appearing peak in gas chromatography is short, and the peak shape is distinctness, which is easy to determine the nature and the quantity and makes the detection rapid and simple.

The invention provides a clean vacuum system used for engine plume test research and a vacuuminzing and repressing method thereof, belonging to the technical field of engine vacuum science. The clean vacuum system comprises a low vacuum system, a low vacuum liquid nitrogen cold trap system, a high vacuum system, a high vacuum liquid nitrogen cold trap system, a low temperature pump liquid nitrogen supply system A, a low temperature pump liquid nitrogen supply system B, an air repressing system, a nitrogen repressing system, a container vacuum measuring system, a residual gas analysis system, a liquid nitrogen heat sink, and a liquid nitrogen heat sink and plume adsorption pump. In the clean vacuum system, the vacuum is obtained mainly relying on the clean low vacuum system, the high vacuum system and the liquid nitrogen heat sink, the liquid nitrogen heat sink and plume adsorption pump; various clean vacuum degrees required by the plume test can be obtained, and the highest ultrahigh dynamic vacuum degree of 10<-6> Pa can be obtained. Both the low vacuum system and the high vacuum system are configured with the liquid nitrogen cold trap system which is used for absorbing the oil steam produced by working of a mechanical pump, so that the cleanness of the vacuum container can be ensured.

The invention discloses a smoking machine-mainstream flue gas cold trap integrated device and a using method thereof. The integrated device comprises a smoke holder, a cold trap device, a cambridge filter and a single-passage smoking machine that are sequentially connected by pipelines; the cold trap device comprises a mainstream flue gas trap pipe and is internally provided with a refrigerant; the mainstream flue gas trap pipe is dipped in the refrigerant; and the mainstream flue gas trap pipe is a quartz pipe of a spiral shape. After the sucking of a cigarette is completed, an organic solvent is added in the mainstream flue gas trap pipe and the mainstream flue gas trap pipe is vibrated sufficiently; the mainstream flue gas condensate is extracted repeatedly; subsequently, the extract is combined; and then the mainstream flue gas sample is analyzed. The method has higher and safer trap efficiency on the aroma-active components in the mainstream flue gas, effectively avoids the generation of various side effects during the flue gas sample treatment process, simplifies the treatment process, shortens time and has higher repeatability. The method has important application prospect in the fields of analyzing cigarette quality and researching flue gas fingerprints.

The invention discloses an enrichment analysis instrument of carbon and nitrogen of the greenhouse gases of CO2 and N2O. A greenhouse gas sample collected by a sampling tube is led through a sample guiding valve under the He gas, is dehydrated by an electron cold trap, undergoes enrichment and transferring in a liquid nitrogen cold trap, undergoes separation by a chromatographic column and dehydrating by a water trap and is led into a gas isotope mass spectrometer through an opened shunting port for being detected. The enrichment analysis instrument has the port which is directly connected with an isotope mass spectrometer mainframe, is an independent accessory device of the isotope mass spectrometer and carries out assay determination on isotope abundance of the carbon and the nitrogen of the greenhouse gases of CO2 and the N2O which are greenhouse gases at the same time. The gas is transferred from a cold trap T1 to a cold trap T2 through conversion of gas-carrying flow and by changing a freezing state of the target gas in the traps. Meanwhile, other impurity gases which are captured by a freezing gas are released and thus, good chromatographic peak shapes and higher purity of the sample are achieved and the testing precision is improved.

The invention discloses a chromatograph on-line analysis method for source rock by closed ball milling, heating analysis and cold trap trapping, which is used for analyzing light fraction compound and percentage composition thereof in the dispersed organic matter of the source rock, and is characterized by comprising the following steps: carrying out vacuum sealing and ball milling on a source rock sample, carrying out ball milling, crushing, then heating to 300DEG C, and carrying out thermal desorption; blowing the pyrolysed hydrocarbon to a liquid helium cold trap by utilizing helium; placing the cold trap into a chromatograph furnace; and trapping, then carrying out chromatograph or Chromatographic-MS on-line analysis to obtain the qualitative data of chromatograph fine separation and/or Chromatographic-MS analysis of the light fraction in the source rock. The separation degree of the sample can approximate to the separation effect of the light dydrocarbon chromatograph separation of crude oil; the invention has good repeatability, reduces the volatilization loss of the light fraction in the crushing process because of the large volume of the sample before being put in a ball milling tank; and the qualitative analysis result can be used for researching the maturity and the environment of sedimentation of the source rock and carrying out oil source comparison.

The invention provides a system and a method for measuring the content of 57 volatile organic compounds in ambient air. The system comprises a four-way valve, a gas chromatograph and a three-stage cold trap preconcentrator; the four ports of the four-way valve are respectively connected with a pre-separation column, a first secondary separation column, a second secondary separation column and a helium gas source; and the gas chromatograph is provided with a flame ionization detector and a mass spectrometry detector. The method comprises the following steps: (1) preparing a mixed standard use gas; (2) preparing an internal standard use gas; (3) collecting an ambient air sample; (4) establishing a standard curve of a target component; and (5) taking the ambient air sample to be tested, removing interfering substances through the three-stage cold trap preconcentrator, performing gas chromatography-mass spectrometry analysis in the mass spectrometry detector after focusing is performed, obtaining the content of each component according to a peak area and the standard curve established in the step (4), and calculating the concentration of the sample to be tested according to a sample injection volume of the sample to be tested. By adopting the method provided by the invention, the simultaneous analysis of two detectors is achieved by once sample injection, thereby avoiding the influence of the interfering substances on the measurement result simply and effectively.

The invention relates to a full-automatic intelligent vacuum freeze dryer, comprising a compressor, an oil cooler, a pneumatically or electrically operated valve, a vacuum pump as well as a pump head valve which prevents oil pollution, a filter, a freeze-drying box, a condenser, a butterfly valve or a mushroom valve with position feedback connected by the freeze-drying box and a cold trap, a temperature probe of products in the freeze-drying box and sterilization coldest point, a shelf assembly heat and cold and heating medium indirect heat exchange system, a relay for judging the temperature and pressure of the heat exchange system and a hydraulic station with the pressure relay; the invention is characterized in that an automatic control intelligent element is selected to automatically judge the condition whether to continue running, judgement is carried out, an alarm is given by running continuously or through a sound control alarm device and process routing and data are recorded, power-off protection and memory functions are provided, the vacuum freeze drying device can continue running according to the forepart process after power is re-supplied. The invention has the advantages of ensuring the rapidity and efficiency of the cold trap coil defrosting; saving the manufacturing cost of the box body and the usage of water with the same cleaning effect; freely setting the steam sterilizing F0 value according to actual condition; and achieving the aim of fast cooling.

Thermopile-based detection and monitoring/control systems are described, in applications such as inferring concentration of a multicomponent gas by sensing a tracer gas therein, utilizing fiber optic cables to provide multiple sensing paths in a cell, utilizing a modulated IR source switched in on/off cycles, verifying chemical reagent identities, and sensing of effluent following discharge from a contamination removal 8 element or cold trap. A thermopile infrared (TPIR) detector of highly compact character is described for such applications, and permits monitoring of species that may be problematic or otherwise deleterious in such environments. In one implementation, light source modulation and signal processing techniques are employed to improve signal to noise ratio and minimize calibration and complexity of the TPIR detector.

A cooling apparatus includes: a first fluid flowpath including the following elements, in downstream flow sequence: a separator vessel; a subcooler having a first side in fluid communication with the first fluid flowpath and a second side configured to be disposed in thermal communication with a cold sink; a flow control valve; a primary evaporator assembly including at least one primary evaporator configured to be disposed in thermal communication with a primary heat load; and a pressure regulator operable to maintain a refrigerant saturation pressure within the primary evaporator at a predetermined set point.

The invention relates to an aquaponic facility with closed water circulation, including at least one aquaculture unit and at least one hydroponic unit, characterized in that the aquaculture unit has at least one water outlet which is functionally connected with the hydroponic unit by a one-way valve such that water from the aquaculture unit can be supplied to the hydroponic unit, and the hydroponic unit has at least one cold trap, wherein the at least one cold trap is functionally connected with the aquaculture unit in such a way that the water obtained from the at least one cold trap can be supplied to the aquaculture unit, as well as its use.