chemical engineering

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The branch of engineering that deals with the technology of large-scale chemical production and the manufacture of products through chemical processes.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun 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.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the branch of engineering that is concerned with the design and construction and operation of the plants and machinery used in industrial chemical processes
• noun the activity of applying chemistry to the solution of practical problems