Design and Operating Procedure of Gas Drying Towers

I. Structure and Design
The gas drying tower is a cylindrical glass vessel with a broad, flat base and a slender midsection. The top is fitted with a ground glass stopper, which has an opening aligned with a sidearm port to control gas flow. The elongated tower body serves as a chamber for holding solid drying agents. The base is wider and flatter than the tower body, with a broad rim that provides stability and helps buffer gas flow. Between the tower body and the base, a constricted section is filled with glass wool to prevent drying agents from falling into the base. Two sidearms are fused to the apparatus: one at the lower part of the base functions as the gas inlet, and one at the upper part of the tower serves as the gas outlet.

II. Operating Procedure

1. Clean and thoroughly dry the tower.

2. From the top opening, first place a small amount of glass wool into the constricted section to prevent drying agents from entering the base.

3. Fill the tower body with a suitable drying agent (e.g., anhydrous calcium chloride, indicating silica gel), then cover it with an additional layer of glass wool.

4. Apply a thin layer of stopcock grease to the ground glass stopper, insert it into the tower opening, and rotate gently until the seal appears clear and even.

5. Install the drying tower into the overall gas-handling system, typically after the gas washing bottle.

6. During operation, gas enters through the lower sidearm, passes through the drying agent, and exits from the upper sidearm, thereby achieving drying.

7. If one drying tower is insufficient, two or three towers may be connected in series with different drying agents to enhance efficiency through multiple stages of drying.