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PetroChina has formally approved the feasibility study report of revamping of purified adipic acid unit, Liaoyang Petrochemical Company. The approved total investment is 499million RMB. Liaoyang Petrochemical Company has,begun the revamping project. After revamping the capacity of purified adipic acid will be 140 kt/a, an increase of 70 kt/a. The revamping project will be completed and put into production in2004.