Improvement of control system of the benzen extraction unit using plant-wide control
Subject Areas : The Application of Chemistry in Environment
Keywords: Cotrol system- Plant-wide control- Benzen extraction unit- Improvement of control syste,
Abstract :
Continuity and relationship between different parts in a chemical process is requirements of a comprehensive control system such as the Plant-wide control system. Three basic elements as the main reasons need to be expressed in a process control system Plant-wide are: The impact of the return flow, The effects of changes in the amount of chemicals inputs, The effects of thermal Integration. Benzene extraction process is including an extraction tower with Solvent and distillation tower to separate and Back solvent. Of the backflow and The possibility of accumulation of material in the process creates favorable conditions for the use of plant-wide strategy. Benzene extraction unit is consists of three main : solvent extraction, distillation and solvent returned. In solvent extraction, food (including benzene, toluene and nonaromatic) into the extraction column, Aromatic materials are recovered using solvent NFM, Then the solvent recovery to distillation and can be returned to extraction unit.
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