Editing Unit operation

{{Short description|Basic step in a process}}
[[Image:LOC MI0086 QuincyMine TIF 00027aS.png|right|thumb|400px|An ore extraction process broken into its constituent unit operations ([[Quincy Mine]], [[Hancock, MI]] ca. 1900)]]
In [[chemical engineering]] and related fields, a '''unit operation''' is a basic step in a [[process (engineering)|process]]. Unit operations involve a physical change or chemical transformation such as separation, crystallization, evaporation, filtration, polymerization, isomerization, and other reactions. For example, in milk processing, the following unit operations are involved: [[Homogenization (chemistry)|homogenization]], [[pasteurization]], and [[packaging]]. These unit operations are connected to create the overall process. A process may require many unit operations to obtain the desired product from the starting materials, or feedstocks.

==History==
Historically, the different chemical industries were regarded as different industrial processes and with different principles. [[Arthur Dehon Little]] developed the concept of "unit operations" to explain industrial chemistry processes in 1916.<ref>{{cite web|title=Arther Dehon Little|work=Scatter Acorns That Oaks May Grow|url=https://archivesspace.mit.edu/repositories/2/archival_objects/254577|publisher=MIT ArchivesSpace|access-date=2023-11-17|language=en}}</ref> In 1923, [[William Hultz Walker|William H. Walker]], [[Warren K. Lewis]] and [[William H. McAdams]] wrote the book ''The Principles of Chemical Engineering'' and explained that the variety of chemical industries have processes which follow the same physical laws.<ref name="Profile">{{cite web|title=Arthur D. Little, William H. Walker, and Warren K. Lewis|url=https://www.sciencehistory.org/historical-profile/arthur-d-little-william-h-walker-and-warren-k-lewis|website=[[Science History Institute]]|access-date=20 March 2018|language=en}}</ref> They summed up these similar processes into unit operations. Each unit operation follows the same physical laws and may be used in all relevant chemical industries. For instance, the same engineering is required to design a mixer for either napalm or porridge, even if the use, market or manufacturers are very different. The unit operations form the fundamental principles of chemical engineering.

==Chemical engineering==
Chemical engineering unit operations consist of five classes:
#Fluid flow processes, including [[pipeline transport|fluids transportation]], [[filtration]], and [[fluidization|solids fluidization]].
#[[Heat transfer]] processes, including [[evaporation]] and [[heat exchanger|heat exchange]].
#[[Mass transfer]] processes, including [[gas absorption]], [[distillation]], [[extraction (chemistry)|extraction]], [[adsorption]], and [[drying]].
#Thermodynamic processes, including [[gas liquefaction]], and [[refrigeration]].
#Mechanical processes, including [[conveyor system|solids transportation]], [[Crusher|crushing and pulverization]], and [[mill (grinding)|screening and sieving]].

Chemical engineering unit operations also fall in the following categories which involve elements from more than one class:
* Combination ([[Mixing (process engineering)|mixing]])
* Separation (distillation, [[crystallization]])
* Reaction ([[chemical reaction]])

Furthermore, there are some unit operations which combine even these categories, such as [[reactive distillation]] and stirred tank [[chemical reactor|reactors]]. A "pure" unit operation is a physical transport process, while a mixed chemical/physical process requires modeling both the physical transport, such as diffusion, ''and'' the chemical reaction. This is usually necessary for designing [[catalytic reaction]]s, and is considered a separate discipline, termed [[chemical reaction engineering]].

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.

In general, unit operations are designed by writing down the balances for the transported quantity for each elementary component (which may be infinitesimal) in the form of equations, and solving the equations for the design parameters, then selecting an optimal solution out of the several possible and then designing the physical equipment. For instance, distillation in a plate column is analyzed by writing down the mass balances for each plate, wherein the known vapor-liquid equilibrium and efficiency, drip out and drip in comprise the total mass flows, with a sub-flow for each component. Combining a stack of these gives the system of equations for the whole column. There is a range of solutions, because a higher reflux ratio enables fewer plates, and vice versa. The engineer must then find the optimal solution with respect to acceptable volume holdup, column height and cost of construction.

==See also==
* ''[[Distillation Design]]''
* [[Extrusion]]
* [[Process simulation]]
* [[Separation process]]
* ''[[Unit Operations of Chemical Engineering]]''

==References==
{{reflist}}

==External links==
*{{Commonscatinline|Unit operations}}

{{Chemical engg}}
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