on march 13, the trend of the phthalic anhydride market in shandong was temporarily stable. nstream factories maintained just in need of purchase, while high-end transactions were blocked. the main trend of the on-site ortho-phenyl method source negotiation was 8600-8700 rmb/ton, and the main trend of naphthalene method source negotiation was 8300-8400 rmb/ton. the on-site merchants’ devices operated stably and the sales situation was general.