日本石油公司和三菱石油公司合并为日石三菱公司后，于１９９９年５月将原三菱石油公司的川崎炼油厂关闭。主要原因是该厂规模太小，年处理量约为３．７５Ｍｔ（７，５００ＢＰＤ）。与此同时，将优化原日本石油公司所属的根岸炼油厂的生产操作，以求提高其整体经济效益。日石 After the merger of Nippon Oil and Mitsubishi Oil into Nisshin-MITSUBISHI, the original Mitsubishi Oil Kawasaki refinery was shut down in May 1999. The main reason is that the plant is too small with an annual handling capacity of about 3.75Mt (7,500BPD). In the meantime, production operations at the Root Bank refinery owned by the former Nippon Oil Company will be optimized in order to increase its overall economic efficiency. Japanese stone