SU33976A1 - Laboratory unit for gas cooling - Google Patents

Description

Usually in laboratory conditions for cooling small amounts of gases to -100 ° C use a mixture of alcohol or ether with solid carbonic acid and for deeper cooling with liquid air. In both cases, small glass Dewar vessels are used.

Both of these methods have major drawbacks when cooling large quantities of gases.

Making a cold mixture of alcohol or ether with solid carbonic acid is associated with a known risk due to the mild ignition of alcohol and ether vapors, poisoning the air in the laboratory with their vapors and with the very painstaking operation of obtaining large amounts of solid carbon dioxide from a liquid carbon dioxide cylinder. The resulting carrot-like mixture, which is stationary, has poor thermal conductivity and does not give the required effect when the gas flowing through the condenser is cooled at high speed.

A large amount of a condenser and a Dewar vessel of large size is necessary to cool a significant amount of gases, and making them in this case from glass is almost impossible, and if it were possible, working with them would be very dangerous.

In the presence of a condenser and a Dewar vessel of considerable size, large quantities of expensive liquid carbon dioxide, alcohol or ether reagents must be expended.

In the proposed laboratory setup, the cooled gas is circulated through the tubes through a condenser placed in a refrigerator chamber, which periodically, to enhance or weaken the degree of cooling, either liquid air is introduced from the reservoir connected with the tubes to the chamber, or the compressed air.

The drawing shows a diagram of a laboratory installation for cooling gases.

The gases are cooled in a condenser consisting of IZ-two tubes P and; V and a condensation collector / C with a pocket for thermocouple T. The condenser is immersed in the chamber of the refrigerator M formed of two metal cups with two tubes brought out and isolated from each other by magnesium carbonate. , glass wool, wood sawdust or some other poor conductor of heat. The refrigerant is air entering the refrigerator M in a liquid or cold gaseous state from a metal tank L equipped with double walls insulated from each other by a poor conductor of heat. The tank A is connected to the chamber of the refrigerator M by tubes O

and C, of which tube C is immersed in liquid air. Both tubes from tank L with liquid air and from refrigerator M are interconnected by short, leather hoses. To weaken the degree of cooling through the cooler M, the tube is lowered into it, air is passed from a pressurized air cylinder, and to enhance the degree of cooling in the cooler M, some liquid air from tank A is periodically pumped through tube C by closing the clamp In, put on the leather tubing D.

The subject matter of the invention.

Claims (2)

1. Laboratory unit for cooling gases circulating inside Condenser tubes with cold air inlets, characterized in that amer of refrigerator M is connected to reservoir A for liquid air with tubes D and. C, from which tube C is immersed in liquid air, and tube D is fitted with a clip B, which serves to periodically shut off this tube in order to transfer part of the liquid air through tube C to the refrigerator J / to enhance the cooling of gases. 2. In a laboratory installation according to claim 1, use a device for attenuating the degree of cooling of gases, consisting of a tube E lowered into the refrigerator, which serves to periodically supply it with compressed air from a cylinder.