Unit operations
From Biocrawler, the free encyclopedia.
Unit operation is the basic principle of chemical engineering. Before 1923 the different chemical industries were regarded as different industrial processings and with different principles.
In 1923 Willian.H.Walker, Warren.K.Lewis and Willian.H.McAdams wrote a book The Principle of Chemical Engineering and thought the variety of chemical industries have processes which follow the same physical laws. They sum up the same processes into unit operations. Each unit operation follows the same physical laws and may be used in all chemical industries. The unit operations form the fundamental principle of chemical engineering.
Chemical engineering unit operations consist of five classes:
- Fluid flow processes, including Fluids transportation, Filtration, Solids fluidization etc.
- Heat transfer processes, including Evaporation, Condensation etc.
- Mass transfer processes, including Gas absorption, Distillation, Extraction, Adsorption, Drying etc.
- Thermodynamic processes, including Gas liquefaction, Refrigeration etc.
- Mechanical processes, including Solids transportation, Crushing and pulverization, Screening and sieving etc.
Chemical engineering unit operations and chemical engineering Unit processings form the main principle of all kind of chemical industries and are the foundation of designs of chemical plants and factories.zh:化工单元操作
