caustic soda

THT Megaelement

Primary brine process:

The raw salt enters the salt tank and is dissolved with the dilute brine from the electrolysis process, the recovered water from the device, and the supplementary water to obtain saturated coarse brine.

Electrolysis process:

The electrolysis process includes three parts: secondary brine refining, electrolysis, and dechlorination of dilute brine.

Evaporation solid alkali process:

The 32% NaOH obtained from the electrolysis process is evaporated through a three effect countercurrent falling film evaporation process, resulting in a NaOH concentration of 50% in the alkaline solution. It is then sent to the concentration unit to produce flake alkali and granular alkali.

Chlorine treatment process:

The wet chlorine gas from the electrolysis process is first washed by the chlorine washing tower, then enters the chlorine cooler for cooling with chilled water. It is then sent to the packing tower through a water mist separator for countercurrent contact with sulfuric acid for the first step of dehydration. The chlorine gas from the packing tower is then sent to the bubble cap tower for countercurrent contact with concentrated sulfuric acid for further dehydration. The acid mist is then captured by the acid mist collector, and then compressed and pressurized by the chlorine compressor before being sent to the chlorine gas user.

Waste gas treatment process:

During the start-up, shutdown, and accident states of the device, the chlorine gas is first absorbed in the absorption tower with the absorption alkali solution from the circulating tank. The tail gas after the absorption reaction enters the tail gas tower for further absorption with the alkali solution. At the same time, the absorption liquid is made into 10% NaClO product and sent to the acetylene device.

Hydrogen treatment process:

The wet hydrogen gas from the electrolysis process, with a temperature of about 85 ℃, enters the lower part of the hydrogen washing tower and is directly cooled and washed with the circulating liquid sprayed inside the tower. The alkali mist and steam condensate contained in the hydrogen gas are taken away by the circulating liquid, and then sent to the hydrogen compressor for pressurization. After two stages of cooling, it is sent out of the battery limit.

Hydrogen chloride synthesis and high-purity hydrochloric acid process:

Chlorine and hydrogen gas are burned in a two in one graphite synthesis furnace to generate hydrogen chloride gas. The generated hydrogen chloride gas is cooled by the hydrogen chloride cooling water tank and hydrogen chloride cooler, and then partially sent to the VCM device as raw material through the hydrogen chloride distribution platform, and partially sent to the high-purity hydrochloric acid absorption system.

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