Drexel glass, Zaporizhia region.

The Drexel glass is a glass vessel used to purify gas from unwanted impurities.Gas enters through a tube immersed in a liquid and, passing through it in small bubbles, is cleaned of substances absorbed by the reagent.
Drexel glasses (with a nozzle) are also used for washing and drying gases and are cylinders with glass plugs through which two tubes pass; one of them is connected to the gas source and reaches the bottom, and the second is short and serves to drain the washed or dried gas.
Drexel's glass - что это такое?
A Drexel glass is a chemical vessel used for gas purification, also called a washing glass. Filtration of gaseous substances occurs through a layer of liquid substance. The construction got its name from the name of the scientist who first used the "bubbling" technique for gas purification. This happened during the isolation of casein, in the second half of the last century. Passing gases through a layer of liquid, Edmund Drexel obtained a gas purified from impurities.

Drexel's glass is similar in principle to Wolff's and Tyshchenko's glasses. But any adsorbent is placed in them, and in Drexel - only liquid. There are modifications with special traps on the outlet tube. Traps are a "pocket" for condensation of gas or steam before exiting the vessel. Sometimes liquid nitrogen or cryogenic fluids are used for cooling.

Using a glass with a Drexel nozzle
The purity of the used or received gas is importantгаза важна, so this glass device is widely used in all laboratories, starting from the school and ending with the quality laboratory at the factory.

Directions when the washing glass is indispensable:
Purification of gaseous compounds.
Determination of gas purity.
Obtaining gases.
Demonstration of chemical reactions.(//tractor-service.com)
As an intermediate (safety vessel) during the operation of a water jet pump.
Design of a Drexel glass
This type of laboratory ware is a glass container and a nozzle with two tubes. One of the tubes is long, reaches the bottom of the glass, the second is short on the other side. The capacity can be of different shapes, often cylindrical. If the tubes are soldered into a removable nozzle, then such a plug can be inserted into any glass vessel suitable for the height and diameter of the neck, to obtain a Drexel glass of the required shape and volume. In fact, the limitation is based on the size of the long tube and the diameter of the plug-nozzle. Such a vessel is often made from a conical or flat-bottomed flask of the required height.

Insidehermetic container Drexel gas is launched, which bubbles through the solution inside the glass. The liquid used for filtration is poured into a container up to half the height of the glass. The long tube is the inlet for gas, it is lowered almost to the bottom so that the gas bubbles pass through the entire layer of the water filter. Purified gas comes out through the second, short tube.
Gas purification using Drexel vessels
a glass of Drexel 500

The Drexel vessel is most often used to rid the gas of various impurities, chemical compounds or physical impurities. The purified gas is passed through this glass at a low speed.

The vessel is pre-filled halfway with a special liquid, which is chosen depending on the suspected contamination or the goals that the chemist is facing. After passing through the liquid, the gas molecules collect above the filter solution layer, and then exit through a short tube from the Drexel glass. Various extraneous compounds, impurities interact with the solution and remain in it. Usually, alkaline or acidic solutions are used. Passing gaseous substances through a layer of sulfuric acid can be dried and cleaned of ammonia compounds. Gases that have passed through barium hydroxide will be freed from carbon dioxide.

In order for the filtration to be more qualitative and economical, it is better to use serially connected Drexel vessels, in which adsorbents of different types or with different degrees of purification are placed. In the first glass from the column, a cheap, roughly purified solution, an adsorbent, is placed, in the last - the most pure, for example, of chromatographic purity. Thus, it is necessary to change adsorbents much less often, which allows you to save high-quality (expensive) cleaning reagents.

To increase the efficiency of bubbling plus thorough filtration of gases, several improved models of Drexel glasses are used. In them, a porous plate or tube with bubblers (holes with a diameter of about 4 mm) is placed on the tip of a long tube. This ensures a larger area of contact between the two phases, gas and liquid, and, accordingly, a higher cleaning quality.