On January 7, Panjin Ruide Chemical Co., Ltd.'s phthalic anhydride plant has a capacity of 100,000 tons. The ortho-xylene-based phthalic anhydride equipment is shut down, while the naphthalene-based phthalic anhydride equipment is operating normally, with limited inventory. Naphthalene-based phthalic anhydride is temporarily not quoted, while ortho-xylene-based phthalic anhydride is quoted at 5,860 yuan per ton, reflecting a price increase. PriceSeek analysis of phthalic anhydride shows a long-short score of 1.5. The shutdown of ortho-xylene-based phthalic anhydride equipment has led to reduced supply, coupled with limited inventory and a price increase to 5,860 yuan per ton, indicating tight market supply, which is favorable for the spot price of phthalic anhydride. Although naphthalene-based phthalic anhydride equipment is operating normally, the lack of quotations further reflects overall supply pressure. It is expected that the spot price will continue its upward trend.