33 results about "In situ infrared spectroscopy" patented technology

The invention provides a selective hydrogenation method of alkyne and dialkene in an alkene stream. The method comprises the steps that: an alkene stream containing alkyne and / or dialkene, and hydrogen are delivered into a hydrogenation reactor provided with a supported palladium catalyst; alkyne and / or dialkene in the alkene stream are hydrogenated into alkene under conditions of: a temperature in of 10 to 80 DEG C, a molar ratio of hydrogen to a total amount of alkyne and dialkene of 1 to 10, and a reaction pressure of 0.1 to 4 Mpa, such that alkyne and / or dialkene in the alkene stream are removed. The supported palladium catalyst comprises a carrier, palladium and optional modifying components. With a carbon monoxide adsorption in situ infrared spectroscopy method, the catalyst is tested under a temperature of 40 DEG C. In an obtained infrared spectrogram, an area ratio of an overhead absorption peak at a location of 1983 to 1990cm-1 to that at the location of 1870 to 1930cm-1 is lower than 0.2, and preferably 0.15. The method provides a high selectivity in the selective hydrogenation of alkyne and dialkene. The method can operate for a long period.

The invention discloses a method for studying a coal spontaneous combustion mechanism based on ultrasonic extraction, and belongs to the technical field of coal spontaneous combustion research methods. The method comprises the following steps that a coal sample is pretreated; the coal sample is subjected to ultrasonic extraction; an extract obtained through the extraction is subjected to the detection of an infrared spectrum, a paramagnetic resonance spectrum and a fluorescence spectrum, and the original coal sample and a coal residue obtained through the extraction are subjected to TG / DSC-FIRE-GC / MS combination, in-situ infrared spectrum analysis and free radical dynamic in-situ analysis; Gaussian 09 is used for establishing active molecule structure models of the extract, original coal sample and coal residue, and transition state characteristics of an reactive oxidation reaction process are studied through the analysis of structural characteristics, charge distribution, reaction activity positions, vibrational characteristics of reaction positions, orbits and the like of the molecular structure models. The method for studying the coal spontaneous combustion based on the ultrasonic extraction has important scientific and practical significance for revealing the coal spontaneous combustion mechanism, developing novel coal spontaneous combustion inhibitors and guiding agents, and guiding on-site fire fighting work.

The invention discloses an in-situ infrared spectrum sample tablet pressing device and its application. The in-situ infrared spectrum tablet pressing device includes a base, a sleeve, a gasket, a cover plate and an indenter; the top of the base is a boss structure, and the sleeve The top is open, the bottom is a groove structure, the bottom of the groove structure is hollow, the groove of the sleeve is installed on the boss of the base, the gasket coincides with the exposed surface of the boss of the base, the cover plate is placed on the top of the sleeve, and the cover plate The center is a hollow structure, the hollow structure is equipped with a filter medium, and the hollow structure is facing the opening of the top of the sleeve; the upper part of the sleeve is provided with an air inlet pipe, and the air inlet pipe runs through one side of the sleeve horizontally, and the air inlet pipe inside the sleeve is along the sample chamber. The tangential direction of the circular cross-section enters the sample chamber. The device is applied in the sample pressing process, and can obtain uniform and complete sample pressing, which is convenient for improving work efficiency and result accuracy.

The invention belongs to the field of lithium battery testing, and in particular relates to a method for quickly optimizing the formula of a lithium ion battery electrolyte, comprising the following steps: step 1: preparing a lithium ion battery electrolyte according to an existing formula; step 2: assembling a simple battery; Step 3: Carry out the charge-discharge cycle test of the simple battery, and at the same time maintain a certain number of cycle intervals for infrared spectrum testing to observe the consumption speed of various additives in the electrolyte and the change in battery capacity. The present invention provides a method of inferring the consumption rate of various additives and quickly optimizing the formula of the electrolyte by observing the in-situ infrared spectrum changes of the electrolyte during the cycle without making a finished battery and without long-term circulation. method.

The invention provides a selective hydrogenation method of alkyne and alkadiene in a C4 hydrocarbon material flow. The method provided by the invention comprises the following steps of: adding the C4 hydrocarbon material flow containing alkyne and / or alkadiene and hydrogen gas into a hydrogenation reactor which is filled with a load type palladium catalyst; carrying out the selective hydrogenation on the alkyne and / or alkadiene in the C4 hydrocarbon material flow to form olefin when an inlet temperature is in a range of 10-80 DEG C, a mol ratio of the hydrogen gas to the sum of the alkyne and the alkadiene is 1-10 and a reaction pressure is in a range of 0.1-4 Mpa, and removing the olefin, wherein the load type palladium catalyst comprises a carrier, palladium and selective modified components; testing the load type palladium catalyst by utilizing a carbon monoxide adsorption in-situ infrared spectroscopy at the temperature of 40 DEG C to obtain an area ratio of a bridge type absorption peak at the 1930-1990cm<-1> to a bridge type absorption peak at the 1870-1930cm<-1> in an obtained infrared spectrogram is less than 0.2, more preferably less than 0.15. The method provided by the invention has a high selectivity to the selective hydrogenation of the alkyne and the alkadiene in the C4 hydrocarbon material flow and can be operated for a long period.

The invention discloses a high pressure in-situ infrared sample cell and an application thereof in a CO2-organic liquid system. The sample cell comprises a stainless steel shell. A through hole is arranged in the shell. Two ends of the through hole are encapsulated by infrared windows. The shell is provided with a sample inlet and a sample outlet, and the sample inlet and the sample outlet are communicated with the through hole. The high pressure in-situ infrared sample cell can be used to research the interaction rules of molecules in a CO2-organic liquid system under a high pressure state. Compared with a molecular dynamic simulation method, the molecular interaction rules of the CO2-organic liquid system under the influence of high pressure can be more vividly represented by the high pressure in-situ infrared spectroscopy. The provided high pressure in-situ infrared sample cell can be used to measure the in-situ infrared spectroscopy of a liquid system, a gas system, and a gas-liquid system under a high pressure condition; the highest pressure can reach 10 MPa, the operation is simple and convenient, the measured data is reliable, and the sample cell can be used to research themicroscopic interaction mechanism of components in a gas system, a liquid system, or a gas-liquid system.

The invention provides a novel goethite / water interface amino acid microstructure and adsorption action mechanism research method. According to the method, an in-situ infrared spectroscopy ATR flow cell technology and a DFT theoretical calculation means are combined to be used, the influences of amino acid molecular structures, pH value, ion strength and other factors on the micro-interface process can be illuminated, and the adsorption kinetics process of the molecular level is disclosed. According to the infrared spectroscopy ATR flow cell technology, the adsorption processes of amino acids can be monitored in situ, and interface information is subjected to on-line enrichment. According to the DFT theoretical calculation, the infrared frequency values of amino acid forms before and after adsorption can be simulated, the peak identification is performed, and the micro-interface structure is further determined. The method disclosed by the invention can provide direct experimental evidence and theoretical basis for determining the micro-interface structure and an adsorption action mechanism of the goethite / water interface amino acids.

A high-pressure in-situ infrared spectroscopy apparatus for monitoring a supercritical system on line comprises a high-pressure reaction kettle, a controller, an infrared spectrometer and a computer, a sample intake valve and a three-way gas-liquid valve of the high-pressure reaction kettle communicate with a high-pressure injection pump, the high-pressure reaction kettle communicates with a metering pump through the sample intake valve and the three-way gas-liquid valve, communicates with a nitrogen cylinder and a vacuum pump through an exhaust valve and a three-way nitrogen valve and communicates with a pressure sensor through a pipeline, a temperature-measuring thermocouple which is connected with the temperature indicator of the controller through a wire is arranged on the high-pressure reaction kettle, a heater and a temperature-controlling thermocouple which are connected with the temperature controller of the controller through wires are arranged on the high-pressure reaction kettle, the pressure sensor is connected with the pressure indicator of the controller through a wire, and the infrared spectrometer is connected with the computer through a wire. The high-pressure in-situ infrared spectroscopy apparatus also comprises an electromagnetic agitator, an emission bin and an optical fiber, the electromagnetic agitator is arranged under the high-pressure reaction kettle and connected with the speed regulator of the controller, the emission bin is arranged on the infrared spectrometer, and the optical fiber is connected with the emission bin and an infrared sensor inserted into the high-pressure reaction kettle.

An in situ infrared spectrum pool for studying a gas-liquid-solid three-phase boundary comprises a pool body with openings at two ends. A top cover is arranged at the upper end of the pool body, a base is arranged at the lower end of the pool body, a sealing ring is arranged between the top cover and an upper end port of the pool body, and a sealing ring is arranged between the base and the pool body. The in situ infrared spectrum pool is characterized in that the top cover is provided with a gas inlet pipe and a gas outlet pipe communicated with the pool body, the base is hollow and provided with infrared crystal, a hollow sealing gasket is arranged between the infrared crystal and the base, a thermocouple penetrates through the top cover to extend into the pool body, and a heating belt surrounds an outer wall of the pool body. The in situ infrared spectrum pool can enable users to study adsorption, desorption and reaction which occur on the gas-liquid-solid three-phase boundary.

The invention relates to an in-situ infrared spectrum cell which comprises a closed cell body, wherein an infrared injecting port and an infrared ejecting port are oppositely formed in the cell body and are used for enabling infrared light to be transmitted in and penetrate through the cell body; a lighting port and a sample setting port are oppositely formed in the cell body further; the lighting port is used for enabling the light to be transmitted into the cell body and irradiated to a sample to be detected; a packaging structural body which is used for sealing the sample setting port is further arranged at the sample setting port. The packaging structural body further comprises a heating element and a temperature measuring element, wherein the heating element is used for directly heating the sample to be detected, and the temperature measuring element is used for collecting the temperature of the sample to be detected.

The invention discloses a sample stretching device for in-situ infrared spectrum analysis, which comprises a casing, a cavity is arranged inside the casing, and a sample placement module and an extrusion module are also arranged on the casing; the casing The body is provided with a first through hole through the housing; the sample placement module is used to install and fix the sample to be tested inside the housing, and the sample is installed and fixed to face the housing. a first through hole; the extruding module is used to extrude the sample installed and fixed on the sample placing module. The device of the present invention can realize the biaxial stretching simulation of the sample film and the in-situ infrared measurement at the same time, without repeatedly removing and reinstalling the sample from the extrusion equipment, simplifying the detection process of obtaining spectral data, and improving the work of sample detection efficiency. The device of the invention has simple structure and is easy to realize.

The invention provides a selective hydrogenation method of alkyne in a C4 hydrocarbon stream. The selective hydrogenation method comprises the steps of introducing the C4 hydrocarbon stream containing alkyne together with hydrogen into a hydrocarbon reactor with a supported palladium catalyst, carrying out selective hydrocarbon on alkyne in the C4 hydrocarbon stream at the inlet temperature of 10-80 DEG C in a molar ratio of hydrogen to alkyne of 1-10 at the reaction pressure of 0.1-4MPa so as to form olefin / alkadiene, then removing alkyne, wherein the supported palladium catalyst comprises a carrier, palladium and a selectable modified component. In the invention, a carbon monoxide absorption in situ infrared spectroscopy is used so as to test olefin / alkadiene at the temperature of 40 DEG C, and in the obtained infrared spectrogram, the area ratio of bridge type absorption peak at the part of 1930-1990cm<-1> to bridge type absorption peak at the part of 1870-1930cm<-1> is less than 0.2, more preferably 0.15. The method has high selectivity on the selective hydrogenation of alkyne in the C4 hydrocarbon stream and can operate for a long period.