Ore Extraction unit operations at Quincy Mine, Hancock, MI ca. 1900

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. The Quincy Mine is an extensive copper mine located near Hancock, Michigan. ... Hancock is a city in Houghton County in the U.S. state of Michigan. ... Chemical engineering is the application of science, in particular chemistry, physics and mathematics, to the process of converting raw materials or chemicals into more useful or valuable forms. ... Look up Process in Wiktionary, the free dictionary Process (lat. ... Homogenization is a term used both in agricultural science and in cell biology. ... Pasteurization (or pasteurisation) is the process of heating food for the purpose of killing harmful organisms such as bacteria, viruses, protozoa, molds, and yeasts. ... Packaging is the enclosing of a physical object, typically a product that will be offered for sale. ...

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. 1923 (MCMXXIII) was a common year starting on Monday (link will take you to calendar). ...

Chemical engineering unit operations consist of five classes:

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

Chemical engineering unit operations also fall in the following categories: In chemistry and alchemy, filtration is the process of using a filter to mechanically separate a mixture. ... Heat transfer is the study of the energy transfer via either conduction, convection, or radiation. ... Evaporation is one of the two forms of vaporization. ... Condensation is the change in matter of a substance to a denser phase, such as gas (or vapor) to a liquid. ... Mass transfer is the phrase commonly used in engineering for physical processes that involve molecular and convective transport of atoms and molecules within physical systems. ... Strathisla whisky distillery in Keith, Scotland Distillation is a method of separation of substances based on differences in their vapor pressures. ... In chemistry, liquid-liquid extraction is a useful method to separate components (compounds) of a mixture. ... In (Chemistry) of a liquid or, most commonly, a gas (adsorbate) is its accumulation on the surface of a solid (adsorbent), forming a molecular film. ... Drying is a mass transfer process resulting in the removal of water from an object. ... It has been suggested that Refrigerator be merged into this article or section. ...

• Combination (mixing)
• Separation (distillation)
• Reaction (chemical reaction)

Chemical engineering unit operations and chemical engineering unit processings form the main principles of all kinds of chemical industries and are the foundation of designs of chemical plants, factories, and equipment used. Audio mixing is used in sound recording, audio editing and sound systems to balance the relative volume and frequency content of a number of sound sources. ... Strathisla whisky distillery in Keith, Scotland Distillation is a method of separation of substances based on differences in their vapor pressures. ... A chemical reaction is a process that results in the interconversion of chemical substances [1]. The substance or substances initially involved in a chemical reaction are called reactants. ... Unit processing is the basic processing in chemical engineering. ...