caustic soda flake evaporator

Technical Advantages

1.      Skid-mounted modular design, plug-and-play

2.      Low power consumption, high cost-effectiveness

3.      Fully automatic PLC control

4.      Customized design available according to customer requirements

I. Product Overview

The evaporator is a complete unit centered on falling-film evaporation. It concentrates 32%~50% caustic soda liquor stage by stage; after flash concentration, the liquor is fed to the flaking machine to produce flake caustic soda (99%). Because high-concentration hot caustic liquor is highly corrosive, the heat-transfer tubes and liquid-contact parts of the equipment are all made of Ni200/Ni201 nickel material. Depending on the target product concentration, we provide customers with customized design and equipment.

II. Technical Principle

The three-effect falling-film 50% caustic soda evaporation and concentration unit can evaporate and concentrate caustic soda of ≤32% concentration into 50% caustic soda. The 32% caustic soda liquor is pumped by the 32% caustic pump into the tube side of the No. I effect heater, where it is distributed and formed into a film, and flows once as a film over the inner surface of the heat-exchange tubes; during the flow it is heated and evaporates and concentrates. The secondary steam and caustic liquor flow out simultaneously from the lower part of the No. I effect heater and enter the No. I effect separator for separation. The caustic liquor concentration after concentration in the No. I effect separator is 36.8%; the liquor is pumped by the No. I effect caustic pump to the No. II effect falling-film evaporator, and the caustic liquor concentration after concentration in the No. II effect falling-film evaporator is 41.7%; it is pumped by the No. II effect caustic pump to the No. III effect falling-film evaporator, and the caustic liquor concentration after concentration in the No. III effect falling-film evaporator is 50%. After heat exchange for heat recovery and cooling, it is pumped by the No. III effect caustic pump to the 50% caustic soda tank farm.

III. Main Features

For the preheater that withstands high temperature, the high-efficiency tube heat exchanger developed by our company is selected, effectively ensuring the reliability of long-term stable operation of the preheater.

For the regulation of caustic liquor flow and liquid level, the non-contact caustic liquor control method developed by our company is selected, effectively ensuring the reliability of long-term stable operation of the control elements.

Plant capacity: 20,000~500,000 t/a [caustic soda, 100% basis]

Steam consumption: 0.45~0.5 [t steam/t · caustic soda (100% basis)]

IV. Application Fields

It is mainly used in the chlor-alkali and caustic soda industries. It is used for the evaporation and concentration of 32% caustic soda liquor in ion-exchange membrane chlor-alkali plants to produce flake caustic soda products of up to 99%. It is suitable both for new flake caustic soda plants and for energy-saving retrofits of existing evaporation systems.

V. Technical Parameters

Company Advantages

Boasting 25 years of professional industry experience in production and supply, CHLORY  factory delivers premium,cost-effective chemical products with reliable quality. Worldwide exported to more than 50 countries, including Italy, USA, Saudi, Africa and other countries and some foreign companies are our agents locally. Equipped with fully automatic production systems and scientific modular production line design, we achieve stable output, high efficiency and low energy consumption while strictly complying with industrial standards. Different from ordinary manufacturers, CHLORY provides flexible customized services tailored to diverse customer needs on product specifications, packaging and solutions. With direct factory pricing and optimized production processes, we help clients cut procurement costs and obtain high-quality, stable chemical supplies with comprehensive professional support.