WordNet records no synonym and no antonym for chemical engineering. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the branch of engineering that is concerned with the design and construction and operation of the plants and machinery used in industrial chemical processes
the activity of applying chemistry to the solution of practical problems
Synonyms, antonyms and the broader and narrower relations for chemical engineering come from Princeton University’s WordNet. Full sources and licences.