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Longman Dictionary of Contemporary English
chemical engineering
noun
EXAMPLES FROM CORPUS
▪ A leaning toward chemistry and chemical engineering was no doubt kindled in some way by a Mickey Mouse comic strip.
▪ After a short period Lymn took Rambush into partnership, forming the gas and chemical engineering firm of Lymn & Rambush.
▪ David Rumschitzki, a professor of chemical engineering, said that he virtually never saw a student who began in mid-level remediation.
▪ He undoubtedly made a major contribution, not only to the profession of chemical engineering but to technology and technological education generally.
▪ His work led to the formation in 1919 of the chemical engineering group of the Society of Chemical Industry.
▪ The research activities of the department are very wide, encompassing most areas of chemical engineering.
▪ They were the basis of the first textbook on chemical engineering which Davis published in 1901.
▪ Wirral-born Mike joined the company in 1979 from Newcastle University where he gained a chemical engineering degree.
Wiktionary
chemical engineering

n. The branch of engineering that deals with the design, construction and operation of industrial process plants, and the physical, chemical and biological processes to create substances or energy in a useful and economic form.

WordNet
chemical engineering
  1. n. the branch of engineering that is concerned with the design and construction and operation of the plants and machinery used in industrial chemical processes

  2. the activity of applying chemistry to the solution of practical problems

Wikipedia
Chemical engineering

Chemical engineering is a branch of engineering that applies physical sciences ( physics and chemistry) and life sciences ( microbiology and biochemistry) together with applied mathematics and economics to produce, transform, transport, and properly use chemicals, materials and energy. Essentially, chemical engineers design large-scale processes that convert chemicals, raw materials, living cells, microorganisms and energy into useful forms and products.