Among them, chemical engineering and chemical technology are related to petrochemical industry.
Petrochemical is mainly about petroleum-related chemical processes, generally referring to oil-gas rectification, flash evaporation, heat exchange, catalytic cracking and other process units.
Regarding employment, the petrochemical industry corresponds to petrochemical units, but the chemical industry and technology of petroleum colleges are the same for petrochemical units.
The undergraduate teaching of chemical engineering and technology is not specific, and graduates can basically find jobs in any aspect of chemical engineering. Only graduate students will do some special research.