Korea Petrochemical Industry Co. (KPIC) has awarded a contract to Lummus Technology for a C4 acetylenes selective hydrogenation unit (AHU) at KPIC’s Onsan chemical plant in Ulsan, South Korea. Once complete, the plant will process 37 kta of feed to the AHU, which will prevent the burning of the byproduct stream as fuel, resulting in lower emissions. The AHU will upgrade a byproduct waste stream by selectively hydrogenating C4 acetylenes to produce larger quantities of butadiene and raffinate products.  The product will be used to produce rubber and supply KPIC’s olefins conversion unit. Earlier this year, KPIC selected Lummus Technology to provide its butadiene extraction (BDE) technology for a new BDE unit being built at the Onsan plant. The unit will produce 146 kta of butadiene.