ʻO ka ʻoihana Petrochemical ka mea nui o ka ʻoihana kemika e hana ana i ka aila ʻaila, ke kinoea maoli a me nā mea ʻē aʻe i loko o ka diesel, kerosene, gasoline, rubber, fiber, chemicals a me nā huahana ʻē aʻe no ke kūʻai aku. He kuleana koʻikoʻi ke kinoea ʻenehana a me ke kinoea nui i kēia ʻoihana. ʻO ka Acetylene, ethylene, propylene, butene, butadiene a me nā kinoea ʻoihana ʻē aʻe nā kumu kumu o ka ʻoihana petrochemical.