50,000ton/annual 50% caustic soda concentration system, double-effect countercurrent and falling film type process.

A Double-effect countercurrent and falling film evaporator is adopted to increase caustic soda liquor from 32% to 50%, and then the 50% finished product caustic soda liquor is cooled and obtained. The heating medium is 0.8Mpa (G) saturated live steam.  

1 set of double-effect countercurrent and falling film evaporator of production capacity 50,000ton/annual NaOH (as 100%), is able to meet the following demands:

1). the caustic soda liquid is concentrated from 32% to 50%, and is cooled down to finished product 50% caustic soda;

2). All components in the plant are well designed to ensure safety in production.

3). The quality of the finished product 50% caustic soda liquid is  above standard GB209-2018 Industrial Sodium Hydroxide.  

4). The main configuration of the plant is as below:

     a. One set of Double-effect countercurrent and falling film evaporator, which was heated medium-pressure steam;

     b. One set of heat recovery system recovering heat from caustic soda liquor and condensate water;

     c. One set of finished product cooling system;

     d. One set of DSC control system.