A Zimpro wet air oxidation (WAO) system supplied by Siemens Water Technologies will treat ethylene spent caustic at a grassroots ethylene production plant in Ras Laffan Industrial City, Qatar. Part of a joint venture agreement between Q-CHEM-II, Qatofin and QP, the Ras Laffan Olefins Company Ltd (RLOC) plant will be one of the world's largest plants for this industry once it is commissioned in 2008.
Using WAO technology will help the plant alleviate two problems frequently associated with ethylene spent caustic: disposal and odor. The technology destroys odorous sulfides, and allows acid neutralization of the spent caustic and discharge to conventional biological treatment. The ethylene plant will have the capacity to produce 1.3 million metric tpa of ethylene. The produced ethylene will travel along a 120 km pipeline from Ras Laffan to Mesaieed, where derivatives polyethylene plants will be located within the existing facilities of Q-CHEM and QAPCO. Q-CHEM's facility has been using Zimpro WAO for spent caustic treatment since 2002.