SU1045126A2 - Gas chromatograph sensitivity correction device - Google Patents

Abstract

A DEVICE FOR CORRECTING THE SENSITIVITY OF A GAS CHROMATOGRAPHE as per Aut. No. 938lii6, characterized in that, in order to calibrate the chromatograph by hydrogen or oxygen, a third electrode is inserted in it, installed in a tank with a spare electrolyte, and the internal volume of the tank with a spare electrolyte is connected the atmosphere.

Description

11 The device relates to the chemical and gas industry, in particular, to gas chromatographic methods for controlling chemical and technological processes, According to the main author, No. a device for correcting the sensitivities of a gas choomatograph, containing electrochemical preparation and input devices 3 is used. - a hydrogen mixture in the ratio. It is equipped with an electrolux. 5 with a coaxially arranged electrode of a chemically indifferent metal. A chemically indifferent porous electrode is placed between the electrodes with a moistened phosphorus pentoxide. The electrolyzer is connected with an asbestos wick with a reservoir containing an electrolyte supply o. In order to maintain the concentration of water in the electrolyte electrolyte, the reserve electrolyte reservoir is filled with a concentrated solution of orthophosphoric acid with an excess of phosphorus pentoxide. The device works as follows. Electrodes are connected to a direct current source through a toggle switch and a microammeter. Gazprom is allowed through the device. When turning on the electric current, the phosphorus pentoxy pentoxy foam on the nozzle is decomposed on the electrodes to form an oxygen – hydrogen mixture in a ratio of 1; 2s is carried away by the producer gas. The amount of oxygen-oxygen mixture 5 that is used here as a standard substance is easily determined, as according to Faradep's law, it is proportional to the duration of action. electric pulse and the current through the electrolyzer. Since phosphorus pentoxide is a strong moisture-removing agent, there is practically no water vapor in the gas-producer gas exiting the electrolyzer. On the other hand, the concentration of moisture necessary for the electrolyzer to work directly on the phosphorus oxide film is not The charge is provided by the action of capillary forces in an asbestos wick. 11 1 2 A disadvantage of the known device is the inability to calibrate the chromatograph according to one of the components of the mixture — oxygen or hydrogen. y ,. This is due to the fact that in the electrolysis process both oxygen and hydrogen are formed in the electrolysis cell simultaneously. The purpose of the invention is to calibrate the chromatograph with hydrogen or oxygen by separate electrolytic generation. This goal is achieved by the fact that a device for correcting the sensitivity of the gas chromatograph introduced a third electrode installed in a tank with a spare electrolyte, and the internal volume of the tank with the spare electrolyte is in communication with the atmosphere. When using the device, there is no need to prepare, store and mechanically input calibration artificial mixtures containing hydrogen or oxygen, using similar devices or additional chromatographic KO.KONKI to separate the components of the oxygen-hydrogen mixture when used (using the prototype, Fig. 1 shows the inventive device; FIG. 2 - Electrical diagram of the device. The device contains an output metal fitting 1 S. It serves simultaneously as a tokahode and is tightly mounted. on the central electrode 2, surrounded by a porous indifferent nozzle 3 impregnated with phosphorus moistened with pytokmsii.The nozzle is placed in the cI-AH enclosure, serving as the AENNO and the second electrode. The fitting 1 is separated from the body and insulator 5 7 grids of insulating material o The disk electrode 8 is located in the reservoir of the spare electrolyte 9, an asbestos wick 11 o is introduced into the tank through the gland packing 10 The packing gland is made with two teflon washers. 12 in which the gasket is clamped (for example ftorplastovy twine) of the electrode 4 is connected with the reservoir 9, the workpiece 13 with a threaded connection, in rezervuaoe 9 there is an opening to the atmosphere. The device works. As follows,.

31 () 451

In the position of the switch b (Fig. It works as a prototype, i.e. an oxygen-hydrogen mixture is formed in the electrolyzer. In position c, the device is disconnected. In position a, the 5th electrode 8 located in the tank 9 for the spare electrolyte is connected to the positive source pole. Molecular hydrogen is generated at the cell body and carried to the chromatograph with the developer gas to the chromatograph. Its concentration in the gas corresponds to Farad’s law, proportional to the current and inversely proportional to the velocity of the propellant gas, o6. %

2g, i - 103 С

pFV f - Farade number;

Where

26

n is the number of electrons participating in the elementary reaction event (for this case, n 2); V is the volumetric gas velocity of the protel, l / s; 3- current A;

22.4 - normal volume of 1 mol of gas, l. By setting different current values, it is possible to calibrate the device using hydrogen. To calibrate for oxygen, the polarity of the current source must be changed.

The use of the proposed device is advisable for both laboratory and industrial chromatographs operating in automatic mode. The device can find application for calibrating other instruments, such as a hydrogen corrosion meter.

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Claims (1)

DEVICE FOR CORRECTION OF SENSITIVITY OF A GAS CHROMATOGRAPH according to ed. No. 938146, characterized in that, for the purpose of calibrating the chromatograph with hydrogen or oxygen, a third electrode is introduced into it, installed in a reservoir with a reserve electrolyte, the internal volume of the reservoir with a reserve electrolyte in communication with the atmosphere.