On January 8, the phthalic anhydride market in Shandong region showed strong consolidation. The mainstream negotiated prices for phthalic anhydride produced via the ortho-xylene method ranged from 5,900 to 6,150 yuan/ton, while those produced via the naphthalene method ranged from 5,600 to 5,850 yuan/ton. The price of raw material ortho-xylene fluctuated upward, while the price of industrial naphthalene stabilized. The cost of phthalic anhydride increased, and the downstream plasticizer market experienced a strong upward trend. The operating rates of phthalic anhydride production facilities declined, leading to a decrease in the overall operating rate of phthalic anhydride manufacturers. Despite sufficient supply in the phthalic anhydride market, the operating load of plasticizer enterprises also decreased. However, rigid demand for phthalic anhydride remained supportive. Looking ahead, the phthalic anhydride market is expected to continue its strong upward trend.