On February 9, the market price of phthalic anhydride in East China showed a weak consolidation trend. The mainstream quotation for ortho-xylene-based phthalic anhydride was between 6,000 and 6,200 yuan per ton, while the market price for naphthalene-based phthalic anhydride ranged from 5,550 to 5,900 yuan per ton. The price of industrial naphthalene fluctuated and declined, while the price of ortho-xylene remained stable, leading to a decrease in the cost of phthalic anhydride. The downstream plasticizer market experienced fluctuating declines, with plasticizer manufacturers operating at low and stable equipment utilization rates. Downstream demand was primarily driven by rigid demand, and phthalic anhydride procurement was mainly based on immediate needs, resulting in weakened support for phthalic anhydride demand. Phthalic anhydride manufacturers maintained stable equipment utilization rates, ensuring ample supply. Phthalic anhydride inventory remained at low levels. It is expected that the future market for phthalic anhydride will continue to show a weak consolidation trend.