... (PA), polyester, phenolic / epoxy and other polymer products; phthalic anhydride, maleic anhydride, refined naphthalene, anthracene, flat plus, fatty alcohol, acid, Sansuo methyl ... sulfide, ion-exchange membrane (or diaphragm) caustic soda, potassium hydroxide, chromic anhydride, sodium hydrosulfide, calcium chloride dihydrate , sulfur, phosphorus pentasulfide and other ...