Chemical Engineering Excellence

Chemical Engineering Excellence

35 Years In Business

Chemical Engineering for the 21st Century

Chemical Engineering for the 21st Century

Innovation, Simulation, Virtualisation

Chemical Engineering Modularisation

Chemical Engineering Modularisation

Custom built, Reconfigurable, Modular Process Plants

Chemical Engineering Unit Operations with a Difference

Chemical Engineering Unit Operations with a Difference

CAD, CAE, CFD, FEA Design, Modelling & Analysis

Chemical Engineering Energy & Environment Sustainability

Chemical Engineering Energy & Environment Sustainability

Energy Optimisation, the Environment a Priority

Chemical Engineering Safety & Operability to a new Level

Chemical Engineering Safety & Operability to a new Level

Unprecedented Safety & Operability methodologies.

To enable the client to increase capacity of the Caustic Soda produced at Sasol Polymers, a two stage Falling Film Backward Feed Evaporator Plant was supplied. The Caustic solution concentration is increased from 32% to a 50% solution with energy supplied by medium pressure steam. The Plant capacity is in excess of 20 t/hr of 32% caustic feed solution.

The 32% feed solution is fed to the Second Effect Evaporator where process vapour from the 1st Effect provides the energy for evaporation. The evaporator is operated under a high vacuum which is provided by a two stage vacuum ejector and condenser installation, to keep the caustic liquor operating temperature at a design minimum. The caustic solution leaves the 2nd Effect between 37 to 40% and is fed to the 1st Effect Evaporator, where medium pressure steam provides the energy input required for evaporation. The 1st Effect operates under pressure to account for the boiling point elevation of the concentrated caustic solution. Plate heat exchangers recover energy from the product streams to maximise energy efficiency during processing. Process and steam condensates are returned to the client.


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