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Formosa Chemicals & Fibre Corporation's Longde plant in Yilan County specializes in producing purified aromatic acids for polyester manufacturing, operating as part of FCFC's 3^rd Petrochemicals Division.

Production Capacity

Purified Terephthalic Acid (PTA):
600,000 tons/year capacity following 1998 upgrade from the original 250,000 t/y plant established in 1988. Combined with Mailiao (1.1 million t/y from two 550,000 t/y units) and Ningbo, China (1.2 million t/y), FCFC's total PTA capacity reaches 2.9 million tons/year.​

Purified Isophthalic Acid (PIA):
200,000 tons/year capacity established in 2005. This is FCFC's only PIA production facility, using metaxylene (MX) from aromatics units as feedstock, processed through oxidation with acetic acid solvent and catalyst, followed by hydrogenation, crystallization, separation, and drying.