SU1723445A1 - Gasometric installation - Google Patents

Abstract

The invention relates to a device for measuring the flow rate of gas, namely, gas-thermal installations used in the study of chemical and biochemical reactions associated with the absorption of oxygen. The aim of the invention is to improve the accuracy and safety in operation. The gasometric unit contains a source of constant-pressure gas 1, a thermostatically controlled bubble chamber 2 and a reaction vessel 3 with a discharge pipe with a valve 7 and a shaking device 4. After switching on the mixing device 4, the valve 7 is opened and the system is purged with gas. The valve 7 is then closed and, after the pressure in the system has been established, the consumption of the absorbed oxygen is measured by counting the number of bubbles in the flow meter over time. 1 ill., 1 tab.

Description

The invention relates to a device for measuring the flow rate of gases, namely, a gasometric installation (PG), designed to measure the flow rate of gas, and can be used in the study of chemical and biochemical reactions associated with the absorption of oxygen.

A PG is known for measuring oxygen absorption, containing a reaction vessel connected to a shaking device, and a source of oxygen in the form of a burette with division and leveling vessel for pressure control.

However, this installation is manual and inconvenient in operation.

The closest in technical essence and the achieved effect is an automatic pressure control PG containing a reaction vessel connected to a shaking device, an oxygen source in the form of a thermostatically controlled gas burette connected to a mercury pressure regulator, and a recording device.

However, known PG has insufficient accuracy, in addition, it is unsafe to use, as it contains a harmful substance - mercury.

The purpose of the invention is to improve the accuracy and safety in operation.

This goal is achieved by the fact that in the PG the reaction vessel is made with a discharge pipe in which a shut-off valve is installed, and the flow meter is made in the form of a transparent chamber, partially filled with a neutral liquid and a supply capillary placed in the bottom of the chamber and made of non-wettable material; moreover, the capillary diameter is in the range of 0.4-0.6 mm, it is connected to a source of constant pressure gas, and the upper part of the chamber is connected to the reaction vessel.

The proposed flow meter measures the amount of gas absorbed by the reaction mixture by compensating for the pressure drop due to an equivalent amount of gas in the form of individual bubbles coming from a constant pressure gas source into the reaction vessel through a capillary.

The drawing shows the GU.

The installation consists of a source of gas of constant pressure 1, a thermostatically controlled bubble chamber 2, made in the form of a cylindrical tube 2a, partially filled with an inert liquid with a capillary 26 placed at the bottom of the chamber, a reaction vessel 3 with a discharge pipe in which an overlapped faucet 7, shaking device 4, thermostat for reaction vessel 5, recording device 6.

GU works as follows.

The reaction vessel 3 is placed in a thermostat 5, the shaking device 4 is turned on, the valve 7 is opened, the system is flushed with gas until the temperature of the heat transfer medium is equal to

thermostat and reaction mixture, close the valve 7, the system sets the pressure according to the equation:

five

0

five

0

.c + ld + pmax,

where Po2 is the oxygen source pressure;

h is the height of the liquid column in the flow meter;

p is the density of the liquid;

q is the acceleration of free fall, 9.81 m / s2.

Then include a recording device that counts the individual bubbles and the total amount of absorbed gas is recorded in the form of a kinetic curve. ,

When gas is absorbed by the reaction mixture, the pressure change in the reaction vessel is regulated by the flow of an equivalent amount of gas through the flow meter from a constant pressure source of gas in the form of individual bubbles in an inert liquid. In order to increase safety in operation, water was selected as the inert fluid. The sensitivity and accuracy of the measurement on the PG depends on the volume of the bubbles. The volume of bubbles depends on the diameter and material of the capillary.

The choice of the optimal diameter of the capillary and the material for its manufacture is presented in Table 1, from which it follows that the greatest sensitivity and the smallest error of determination are provided by a diameter of 0.4-0.6 mm made from Teflon.

The use of the proposed PG will allow measuring the gas absorption rates from 10 to mol / hp with high accuracy: measurement error v 1.0%, sensitivity 6–9 mm. PG can be used to quantify synthetic and natural antioxidants contained in organic objects.

Claims (1)

Invention Formula A gasometric unit containing a reaction vessel with a shaking device, a source of constant pressure gas, a shut-off valve and a flow meter with a recording device, about l and h a0 five five So that, in order to increase the accuracy and safety in operation, the reaction vessel in it is made with a discharge pipe, in which a shut-off valve is installed, and the flow meter is made in the form of a transparent chamber, partially filled with neutral liquid and a supply capillary placed in the bottom of the chamber and made of non-wettable material, the diameter of the capillary lying within 0.4-0.6 mm, it is connected to a source of constant pressure gas, and the upper part of the chamber is connected to the reaction vessel. Selection of the optimal capillary diameter and material for its manufacture Non-wettable teflon 0.7 The measurement error was determined by the reproducibility of the number of bubbles in a volume of 1 ml with a 10-fold repetition. 1,0 bO 1.1 10.0 3.0 Error due to poor reproducibility Desensitization