14 results about "Coulometry" patented technology

The invention belongs to the field of chemical reagent moisture detection, and particularly relates to a coulometry Karl Fischer reagent for aldehyde ketone moisture detection and a preparation method of the coulometry Karl Fischer reagent. The coulometry Karl Fischer reagent for aldehyde ketone moisture detection is prepared from the following components in parts by weight: 1 to 15 percent of imidazole, 1 to 15 percent of 2-methylimidazole, 25 to 70 percent of ethylene glycol monomethyl ether, 5 to 30 percent of trichloromethane, 2 to 30 percent of trifluoroethanol, 2 to 10 percent of sulfur dioxide, 1 to 10 percent of methyl iodide, 0.1 to 5 percent of tetrabutylammonium iodide and 0.1 to 5 percent of iodine. The method does not contain hydroxyl compounds, effectively inhibits the generation of side reactions in detection, ensures the detection accuracy, and improves the product stability and effectively shortens the instrument equilibrium time by adding iodomethane and tetrabutylammonium iodide.

The invention relates to the technical field of heavy oil detection, in particular to a method for detecting the content of organic chlorine in heavy oil, which comprises the following steps: removing free water from to-be-detected heavy oil containing free water to obtain a heavy oil sample containing emulsified water, taking out the heavy oil sample containing emulsified water, adding a solvent which has a boiling point higher than 204 DEG C and is insoluble in water to obtain a diluted crude oil sample, and measuring the content of organic chlorine in heavy oil. The method comprises the following steps: centrifuging and dehydrating a thin oil sample to obtain a dehydrated crude oil sample, distilling the dehydrated crude oil sample to obtain fractions at the temperature of 204 DEG C or below, and detecting by using a micro-coulomb method to obtain the content of organic chlorine in the thickened oil. According to the method, the water-insoluble solvent with the boiling point higher than 204 DEG C is used for diluting the thickened oil, then the distillate oil with the boiling point higher than 204 DEG C is distilled out, and then the content of the organic chlorine in the distillate oil with the boiling point higher than 204 DEG C in the crude oil is determined by the microcoulometric method, so that the method has the advantages of high efficiency, simplicity and accurate measurement result, meets the GB / T 18612 requirement, and can realize rapid and accurate detection of the content of the organic chlorine in the water-containing thickened oil.

Various embodiments of the teachings herein include a method for ascertaining at least one average capacity loss of a battery storage device. The method may include: measuring at least two load cycles of the battery storage device using a high precision coulometry apparatus; determining a first charge displacement and a second charge displacement; determining a capacity loss equal to the difference between the first charge displacement and the second charge displacement; repeatedly measuring load cycles until the capacity loss is almost constant in at least two consecutive load cycles; and ascertaining an average capacity loss based on at least two capacity losses.

The invention relates to the technical field of moisture detection, and provides a Karl Fischer reagent for detecting moisture content in cyclic ether compounds by coulomb voltammetry, the Karl Fischer reagent comprises the following raw materials by weight: 7-8 parts of iodine, 330-340 parts of a mixed solution, 60-70 parts of imidazole, 6-7 parts of 2-methylimidazole, and 25-35 parts of sulfur dioxide; the mixed solution comprises ethylene glycol monomethyl ether, trifluoroethanol and diethylene glycol monoethyl ether; the ratio of the weight sum of the trifluoroethanol and the diglycol ether to the weight of the ethylene glycol monomethyl ether is 1: 1; the weight ratio of the trifluoroethanol to the diethylene glycol ethyl ether is (0.5-1.5): 1. According to the technical scheme, the problems of many side reactions and low detection accuracy when the moisture content in the cyclic ether compound is detected in the prior art are solved.

The invention discloses a sucrose purity determination method, which innovatively utilizes an ion chromatography-pulsed ampere detector to determine trace organic impurities, combines a firing residue weighing method to determine inorganic impurities and a Karl Fischer Coulomb method to determine moisture, and calculates the content (purity) of main components according to a mass balance principle. The method has the advantages of simplicity and convenience in operation, reliable result, high sensitivity and the like, can be widely applied to the fields of sucrose quality control and quality evaluation, and has important significance in improving sucrose product quality and promoting development of related industries.

Systems and method for use in measuring lead levels in biological samples is provided. Using square wave coulometry and colloidal metallic particles impregnated on printed carbon electrodes on a sensor, the system provides a rapid, reliable, portable and inexpensive means of detecting low lead levels.

The invention discloses a general dynamic titration optimization method applied to a coulometry potentiometric titrator, which comprises the following steps: S101, in an initial stage, carrying out electrolysis by using small electrolytic current and medium electrolytic current, and monitoring potential change in real time; s102, when it is judged that the real-time potential is not larger than the control potential, entering an acceleration stage; s103, when it is judged that the real-time potential is smaller than the control potential, entering a speed reduction stage; and S104, judging whether to enter an end stage or not through a differential method. According to the present invention, a universal measurement method with both higher speed and higher precision is provided.

The utility model relates to the technical field of coulometry trace moisture meter electrolytic tanks, and discloses a coulometry trace moisture meter electrolytic tank with a light shield device, which comprises a light shield body, an observation component is arranged at the top of the light shield body, a sample injection component is arranged on one side of the light shield body, and a sample discharge component is arranged on the other side of the light shield body. And an electrolytic tank assembly is arranged in the light shield body. The coulometry trace moisture meter electrolytic tank with the light shield device and the coulometry trace moisture meter are simple in structure and convenient to disassemble, have the functions of shielding light, dehumidifying, preserving heat and preventing corrosive gas from corroding the electrodes, and compared with a traditional trace moisture meter, the coulometry trace moisture meter electrolytic tank and the coulometry trace moisture meter have the advantages that the requirement for the instrument installation environment can be lowered, and the cost is lowered. According to the coulometry trace moisture meter electrolytic tank, the electrolyte state can be kept in a balanced state, the purpose of rapidly measuring a sample is achieved, the coulometry trace moisture meter electrolytic tank can ensure that the meter can prolong the service time of electrolysis, and the pollution of a Karl Fischer reagent to the environment is reduced.

The lithium-ion single cells after formation are measured using high precision coulometry in order to relatively quickly group the lithium-ion single cells into a grade according to their expected aging, wherein one or more criteria including coulombic efficiency, energy efficiency, average capacity loss, and effective single cell internal resistance are used for the grouping.

The present application provides a method for measuring trace water in cumene hydroperoxide solution. First, the concentration of the cumene hydroperoxide solution is measured by indirect iodine titration, then the cumene hydroperoxide solution is reduced by adding excess triphenylphosphine to eliminate the oxidizing property of the cumene hydroperoxide, and the reduced solution is obtained, then the water content of the reduced solution is measured by Karl Fischer coulometry, and finally the water content of the original cumene hydroperoxide solution is converted. According to the method described in the present application, the trace water content in the cumene hydroperoxide solution can be measured, the quality index of the cumene hydroperoxide is controlled, the influence of the water in the cumene hydroperoxide solution on the performance of the epoxidation catalyst in the subsequent section is avoided, and the service life of the catalyst is prolonged.

The utility model discloses a Karl Fischer coulometry trace moisture meter which comprises a meter main machine, a titration cell bottle is arranged on the right side of the top face of the meter main machine, a weighing table is arranged on the right side of the meter main machine, and a first fixing plate is fixedly connected to the middle of the top face of the weighing table. A second fixing plate is fixedly connected to the top of the right side of the front face of the first fixing plate, and a first electric telescopic rod is fixedly connected to the middle of the left side of the second fixing plate. A motor, a rotating frame, a second electric telescopic rod, a clamp and a first electric telescopic rod are arranged, the motor is arranged in a driving box, the rotating frame is arranged at the output end of the motor, the second electric telescopic rod is fixedly connected to the rotating frame, the clamp is arranged at the bottom of the second electric telescopic rod, and the first electric telescopic rod is arranged on the right side of the driving box; according to the function, detection liquid can be extracted and injected through mechanical driving, manual injection is not needed, and the situation that the bodies of detection personnel are injured by poisonous and harmful detection liquid can be avoided.

The application relates to the technical field of water content analyzers, and discloses an online Karl Fischer coulometric water microanalyzer, which comprises a machine body, an electrolytic cell is arranged on the top of the machine body, a plurality of joints are integrally formed on the top outer wall of the electrolytic cell, two joints are both internally inserted with connecting rods, the bottom of each connecting rod is provided with an electrode rod through an adjusting mechanism, the two electrode rods are respectively used for electrolysis and micro measurement, the adjusting mechanism is used for adjusting the height of the electrode rod, the top of each connecting rod is provided with an electric wire which is electrically connected with the electrode rod, and the connecting rod and the joint are fixedly connected through a locking assembly. Through cooperation of the multiple components, the electrode rod can be disassembled for cleaning, can be fixed after being reinstalled, is more stably fixed, can be more uniformly smeared with silicon grease, and the accuracy of micro detection of the device is improved.

The invention discloses a multi-channel feeding and discharging system and a multi-channel feeding and discharging method for Karl Fischer Coulomb method micro-water determination, relates to the technical field of micro-water determination, and mainly aims to solve the problems of low detection efficiency, high operation difficulty and large deviation caused by existing manual single-channel sample injection Karl Fischer Coulomb method micro-water detection. Comprising a multi-channel switching assembly, a sampling assembly, a plurality of sample feeding pipes, a sample discharging pipe, a liquid discharging pipe and a Karl Fischer electrolytic tank, the multi-channel switching assembly is connected with the plurality of sample introduction pipes through the plurality of sample introduction interfaces; the multi-channel switching assembly is connected with the sample outlet pipe through the sample outlet interface; the sample outlet pipe is connected with the Karl Fischer electrolytic tank; the multi-channel switching assembly is connected with the sampling assembly through the sampler interface; and the multi-channel switching assembly is connected with the liquid discharge pipe through the sample pipeline cleaning interface.