High Acid Crude Palm Oil (HACPO or ACPO) is another bio-diesel feedstock with an of FFA 8~15% that is also used to produced bio-diesel which meets international bio-diesel standards such as EN 14214 and ASTM D6751. Perchloric acid shows high catalytic activity for the conversion of FFA to FAME that can be used to treat a wide range of acidic oils and fats as well.