Evaporation plays an important role in the basic operations of the chemical
industry.
Typical examples of such processes are:
- Concentration of solutions from industrial processes such as caustic soda,
aluminate liquor, black liquors, process streams or process waste streams,
hydrochloric acid, sulphuric acid, industrial effluents, etc.
- Crystallization by evaporation for the production of various inorganic and
organic compounds such as sodium chloride (salt from brines), potassium
chloride, ammonium sulphate, sodium sulphate and adipic acid.
To satisfy the wide spectrum of process requirements which an evaporation
system has to meet, we supply all evaporator types which are of proven design.
Construction materials, such as carbon steel, rubber lined, monel clad, full
monel, nickel, titanium nickel alloys, stainless steel, plastic materials etc.
are utilized.
For the concentration of liquors mainly evaporators with thermal
recirculation are employed. According to the liquid load of the heating surface
non-recurrent flow or recurrent circulation is to be designed. For special
cases a forced circulation system with a high heat transfer coefficient has
been developed. The most suitable type has to be chosen in each case with due
consideration of the main factors, namely: sensitivity of the liquor to
temperature, tendency to scale, accessibility for maintenance, limited use of
expensive construction materials.
Typical examples for evaporator types are: