What could cause a chlorine gas cylinder to frost?

What could cause a chlorine gas cylinder to frost?

• A. Feed rate is too low
• B. pH of the water is too high
• C. pH of the water is too low
• D. Feed rate is too high

Answer: (D)

When the feed rate of chlorine gas is too high, it can lead to a rapid expansion of gas as it is released from the cylinder. This release causes the temperature around the valve and the cylinder to drop significantly, resulting in the formation of frost. The phenomenon occurs because of the Joule-Thomson effect, where the pressure of the gas decreases as it expands, leading to a cooling effect. This cooling can be visually observed as frost developing on the cylinder's surface and associated fittings. In contrast, an inadequate feed rate would not produce enough gas flow to create significant cooling, preventing any frost formation. The pH levels of the water, whether high or low, primarily affect the chlorine's effectiveness and required dosage, but they do not directly impact the temperature changes in the chlorine gas system itself. Therefore, the condition that results in frost forming on the chlorine cylinder is primarily linked to an excessively high feed rate.

When the feed rate of chlorine gas is too high, it can lead to a rapid expansion of gas as it is released from the cylinder. This release causes the temperature around the valve and the cylinder to drop significantly, resulting in the formation of frost. The phenomenon occurs because of the Joule-Thomson effect, where the pressure of the gas decreases as it expands, leading to a cooling effect. This cooling can be visually observed as frost developing on the cylinder's surface and associated fittings.

In contrast, an inadequate feed rate would not produce enough gas flow to create significant cooling, preventing any frost formation. The pH levels of the water, whether high or low, primarily affect the chlorine's effectiveness and required dosage, but they do not directly impact the temperature changes in the chlorine gas system itself. Therefore, the condition that results in frost forming on the chlorine cylinder is primarily linked to an excessively high feed rate.