Liquid chlorine vaporization system for phosphorus trichloride production

Abstract

The invention belongs to the field of chemical equipment, and discloses a liquid chlorine vaporization system for phosphorus trichloride production. The system is composed of a liquid chlorine steel bottle, a box-type calandria vaporizer and a chlorine buffer tank; the box-type calandria vaporizer is composed of a box body and a calandria; the calandria is a horizontal snake-shaped pipe structure, the horizontal pipe section of the structure is positioned in the box body, the bend pipe section of the structure is positioned out of the box body, and the bend pipe section and the horizontal pipe section are welded out of the box body. The calandria in the box body of the box-type calandria vaporizer provided by the invention has no welding line, the welding line is arranged at the bend head out of the box body, thus the safety hazard of liquid chlorine leakage caused by the heating of the welding line and the corrosion of the inner surface and the outer surface by the complete immersion of the calandria in hot water in the prior art is avoided; and the system has simple structure, is easy to operate, and is save and reliable.

Description

technical field [0001] The invention belongs to the field of chemical equipment and relates to a liquid chlorine vaporization system for phosphorus trichloride production. Background technique [0002] Liquid chlorine vaporization is the primary process of phosphorus trichloride production, and liquid chlorine is a low-pressure liquefied and highly toxic gas, which is a hazardous chemical. The most unsafe factor is: the raw materials used in the production of chlor-alkali are industrial salt and water, and the introduction of ammonium substances cannot be avoided. When the refined brine containing ammonium ions is used for the electrolysis reaction, the ammonium ions react chemically with the electrolysis product chlorine to generate nitrogen trichloride. The latter enters the liquid chlorine production system together with the chlorine gas. When chlorine gas is liquefied, nitrogen trichloride is also liquefied and mixed into the liquid chlorine. When chlorine gas is used...

AI Technical Summary

Problems solved by technology

Steam can cause the liquid chlorine in the tank to vaporize rapidly and is difficult to control; hot water needs to add a hot water circulation device (such as hot water tank, hot water pump, etc.)

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