SU1749771A1 - Method for determining deaerational capability of liquids - Google Patents

Abstract

The method for determining the deaeration capacity of liquids. SUMMARY OF THE INVENTION: A float is immersed in a test liquid and suspended from a rocker of a hydrostatic balance. The float is heated simultaneously with the liquid heated to the test temperature, after which the initial density is measured using a hydrostatic balance. Then, the test liquid is aerated. After aeration, the density of the test liquid is determined at regular intervals by hydrostatic weights until the initial density of the liquid is reached. The deaeration capacity of the test liquid is determined from the time of the increase in the density of the fluid from the minimum to the density corresponding to an air content of 0.2 vol% in it. 1 il.

Description

The invention relates to physical chemistry, in particular to chemotology.

There is a known method for determining the deaeration capacity of a liquid, including immersing the body (hydrometer), determining the initial density of the liquid, aerating it with attaching and disconnecting the delivery device, determining the deaeration capacity of the liquid according to the time it reaches the specified air content in it, measuring the density at regular intervals using a hydrometer .

The disadvantage of this method is the low accuracy of the determination of the deaeration capacity due to the use of a hydrometer as a tool for measuring the density. In addition to this, this method is not applicable for highly viscous liquids and has low accuracy of temperature control.

The closest to the present invention is a method for determining the deaeration capacity of a liquid, including heating the float, immersing it in a test vessel with a liquid and removing from it, suspending the float from the rocker hydrostatic balance, determining the initial density of the liquid, aerating it with attaching and detaching the injection device, determining dehydration ability of a liquid in time to reach 0.2 vol.% of air in it by measuring the density of a liquid at regular intervals of time.

The disadvantage of this method is the relative complexity of the equipment-N N VJ h

design and method for determining the deaeration capacity, h also low accuracy and low productivity.

The aim of the invention is to improve the accuracy and simplify the method.

The drawing shows a diagram of an apparatus for determining the deaeration capacity of a liquid.

The device comprises a vessel 1 with a test liquid, which is covered with a lid with three openings.

The outer chamber (jacket) 2 serves to thermostat the test vessel.

8 hole 3 of the cover 4 is placed thermometer 5 to monitor the temperature during the entire test period with an accuracy of

± 0.1 ° С.

Hole 6, located in the center of the cover, is designed to immerse the float 7, mounted on a platinum wire 8 and suspended on the rocker arm

9 hydrostatic balance 10. Hole 11 is designed to install the nozzle 12 of the air duct 13 with a fine mesh 14 to supply heated air passing through the thermostat 15, the adsorption column 16, the filter 17 and the throttle 18, the pressure gauge 19 controls the pressure of the aeration air.

The method of determining the deaeration capacity of a liquid is carried out as follows.

The test liquid 1 is poured into the test vessel 1 and closed with a lid 4 with holes 3, b and 11, in which thermometer 5, platinum wire 8 with a suspended float 7 and pipe 12 of the air line 13 with a finely porous grid 14 are pre-positioned, respectively. 7 is immersed in the test liquid and suspended by means of a wire 8 to the rocker arm 9 hydrostatic scales 10.

The float 7 and the test liquid are heated by passing a thermostatic fluid heated to the set temperature in the thermostat 15 through the jacket 2 of the test vessel 1.

After the target temperature is established in the test vessel 1, which is recorded by the thermometer 5, the initial density is measured using a hydrostatic balance 10.

The air line 13 is connected to the injection device and the test liquid is aerated with air heated in a thermostat 15 and purified on an adsorption column 16 and a filter 17.

In the aeration process, purified and heated to the test temperature, the air under pressure, controlled by a pressure gauge 19, is supplied through the nozzle 12 with a finely porous mesh 14 at its end into the liquid and saturates it with air for a certain time. The air line is then disconnected from the injection device and the density of the aerated

liquids at regular intervals using a hydrostatic balance 10 until the initial density of the test liquid is reached.

The deaeration capacity of the test liquid is determined from the time of the increase in the density of the liquid from the minimum (liquid is saturated with air) to a density corresponding to an air content of 0.2 vol.

The calculation of the amount of air dispersed in the fluid sample is made according to the formula:

„, -UO. RO Re

where B is the amount of dispersed air, vol.%;

PO is the density of the fluid before the test,

g / cm3;

PC-- fluid sample density through

certain periods of time (, 2, 3, ...) after disconnecting the air supply;

p - the density of air at a given temperature and pressure in the test vessel, g / cm3.

PRI me R. 180 ml of IGP-18 industrial oil is poured into the test vessel, which is used as a working fluid in the hydraulic systems of the machine, press and other equipment. Then

The vessel is closed with a lid with a thermometer inserted into it, an air duct pipe and a float suspended on a platinum wire to the rocker of hydrostatic weights.

The float is immersed in oil and placed at a distance of 10 ± 2 mm from the bottom of the test vessel. Floats and oil are heated in a vessel to 50 ° C, passing through its thermostatting jacket the water heated in a thermostat.

After the temperature in the test vessel is set at 50 ° C, the initial density of the oil is determined using hydrostatic weights. Conduct

aerating the oil with air heated in a thermostat at a pressure of 0.2 kg / cm2 for 7 minutes at a constant temperature control. After 1 min after turning off the air, the oil-air density is determined.

variance pi. Next, the densities are determined.

(p2, rzpt) through each chickpea until

until they reach the value of the initial density PO. By the formula, calculate the amount of dispersed air. For IGP-18 oil at 50 ° C, the deaeration capacity is 5 minutes with an air content of 0.2 vol%.

Claims (1)

The invention of the method for determining the deaeration capacity of liquids, which consists in heating the float, hanging it to to determine the hydrostatic balance, determine the initial density of the liquid, aerate it, measure the density of the liquid at regular intervals and determine the deaeration capacity of the liquid over the time it reaches 0.2 vol.% of air in it, characterized in that, in order to improve the accuracy of determination and simplification In this way, the pre-float is immersed in the test liquid, and it is heated simultaneously with the heating of the test liquid in the vessel. 15.