On September 19, Tangshan Huayi Industrial Co., Ltd.'s quote for maleic anhydride is 6,300 yuan per ton. The specifications of maleic anhydride are as follows: grade: premium; content of maleic anhydride: ≥99.5%; process: benzene oxidation method. The validity period of the quote is 3 days. The quote provider is Jinan Aochen Chemical Co., Ltd.