On-line monitoring and controlling system used for sodium hypochlorite production

Abstract

The invention discloses an on-line monitoring and controlling system used for sodium hypochlorite production. The on-line monitoring and controlling system is characterized in that according to the on-line monitoring and controlling system, a circulation liquid temperature monitoring system, a circulation liquid pH value monitoring system and a gas inlet flow monitoring system are respectively arranged on a gas-liquid inlet of a sodium hypochlorite reaction tower. Meanwhile, the gas-liquid inlet is provided with a gaseous phase self-control valve connected with a flow and valve control module, by the adoption of the structure, the on-line monitoring and controlling system can perform real-time detection in the sodium hypochlorite production process, and the reaction time of the sodium hypochlorite production is controlled to ensure product quality.

Description

technical field [0001] The invention relates to the production of sodium hypochlorite, in particular to an on-line monitoring and control system used in the production of sodium hypochlorite. Background technique [0002] Sodium hypochlorite solution is widely used as bleaching agent in textile and papermaking industries, disinfectant in drinking water, swimming pool, etc., as well as chlorinating agent and oxidizing agent in other industrial fields, and has a wide range of uses. The production of sodium hypochlorite is mainly obtained by reacting sodium hydroxide solution with chlorine gas. Its production process can be divided into continuous production process and batch production process. Whether it is a continuous method or a batch method, the production process uses about 15% sodium hydroxide to react with chlorine gas to produce sodium hypochlorite products with an available chlorine content> 10% and a sodium hydroxide excess alkalinity < 1%. [0003] In the r...

AI Technical Summary

Problems solved by technology

However, at present, the amount of chlorine flow and the reaction termination point in the production process of sodium hypochlorite and other batch reactions cannot be continuously detected and controlled online. Usually, it can only be obtained by manually closing the valve on site and sampling and analyzing in the laboratory.

Therefore, in the later stage of the reaction, frequent on-site manual switching of valves and sampling analysis are required, with a large workload and low efficiency; manual switching of valves on site makes it difficult to grasp the intake air volume and intake time; and the human factor of manual analysis is impossible. Avoid, no matter how fast the sampling analysis is, there will inevitably be a certain lag, so it has little guiding significance for production

Images