What is unit operation.

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  • Aug 12th, 2006

equipments used in a chemical plant

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Ravi Kumar

  • Sep 21st, 2006

Unit operation is the operation of transforming the material without changing its chemical properties. It does not involve any reactions.. Its just a communition process or a seperation process.

Ajaya Kumar Pani

  • Sep 26th, 2006

Unit operation involves all types of operations carried out in chemical and process industries which do not involve any chemical reaction. Hence the chemical properties of the substance do not change however the physical properties may change. Examples are Size reduction operation, Different type of separation operations and heat transfer operations

yohesh kannan

  • Jan 19th, 2007

It should not involve any chemcial reaction Then we can call it as Unit Operation.





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In chemical engineering and related fields, a unit operation is a basic step in a process. For example in milk processing, homogenization, pasteurization, chilling, and packaging are each unit operations which are connected to create the overall process. A process may have many unit operations to obtain the desired product.

Historically, the different chemical industries were regarded as different industrial processes and with different principles. In 1923 William H. Walker, Warren K. Lewis and William H. McAdams wrote the book The Principles of Chemical Engineering and explained the variety of chemical industries have processes which follow the same physical laws. They summed-up these similar 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 principles of chemical engineering.

Chemical engineering unit operations consist of five classes:

  1. Fluid flow processes, including fluids transportation, filtration, solids fluidization
  2. Heat transfer processes, including evaporation, condensation
  3. Mass transfer processes, including gas absorption, distillation, extraction, adsorption, drying
  4. Thermodynamic processes, including gas liquefaction, refrigeration
  5. Mechanical processes, including solids transportation, crushing and pulverization, screening and sieving

Chemical engineering unit operations also fall in the following categories:

Chemical engineering unit operations and chemical engineering unit processing form the main principles of all kinds of chemical industries and are the foundation of designs of chemical plants, factories, and equipment used


unit operation is an important field in chemical engineering,it generally deals with the chemical processes involved in any chemical industry and rules governing these changes.

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  • Jul 5th, 2011

A unit operation is any part of potentially multiple-step process which can be considered to have a single function with clearly defined boundary.

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Tejas Patel

  • Aug 2nd, 2011

see what is the basic difference between unit operations and unit processes. The term unit operations has been restricted to those operations in which the changes are primarily physical. unit processes involve chemical changes and imply commercialization of chemical reactions under economically profitable conditions. Thus, while the crystallization of sugar from a sugar solution is a unit operation, the production of ethanol from a sugar solution involves a unit process.

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Kingsuk Karmakar

  • Aug 2nd, 2017

In chemical engineering and related fields, a unit operation is a basic step in a process. unit operation involves a physical change or chemical transformation, such as separation, crystallization, evaporation, filtration, Polymerization, isomerization and other reactions.

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Akash shrama

  • Aug 13th, 2017

Each chemical process frequently consists of a fewer number of distinct individual step.

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  • Sep 10th, 2017

Unit operation is the basic step in any chemical engineering related fields, in this operation only physical changes are occurred but not chemical changes
Ex:-heating, cooling, evaporation, sedimentation

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