Pra Rancangan Pabrik Dibutyl Phthalate dari Phthalic Anhydride dan N-butanol dengan Katalis Asam Sulfat Kapasitas 10.000 Ton/Tahun

Abstract

The preliminary design of dibutyl phthalate for 10,000 ton/year capacities utilizes methanol of raw material to result dibutyl phthalate with purity 99%. The process is reaction of phthalic anhydride and n-butanol with sulfuric acid catalyst to produce dibutyl phthalate in fixed bed reactor at 303 K and 1 atmosphere. This plant is included low risk plant because processes at low operation condition (temperature and pressure), another raw material is obtained. This plant is planned to be built in Gresik, East Java, It covers 10000 m2 of land and needs 163 employees. It works continually for 24 hours/day and 330 days/year. Process unit requires 3310.7738 ton/year of water, whereas utility unit needs 160.1704 kg/hour water for cooling, 2562,5 kg/hour water for domestic, 1.3566 kg/hour of steam, 167.964 kW of electricity, 12.144 kg/hour of fuel oil and 222,769 kg/hour of pressured air. The economic evaluation shows Fixed Capital of Rp. 96.473.058.451 + US$ 7.188.752,49, Working Capital of Rp. 37.912.467.684 + US$ 2.825.072,11, Profit before taxes Rp. 21.525.041.424,77, Profit after taxes Rp. 18.726.786.039,55. Feasibility studies results in Break Even Point (BEP) of 44% (BEP requisite in Indonesia 40% - 60 %), Shut Down Point (SDP) of 20%, and Discounted Cash Flow Rate of Return (DCFR) of 25%. Meanwhile Return On Investment Before Taxes (ROIb) of 24% (ROIb requisite for low risk plant > 11%) and Return On Investment After Taxes (ROIa) of 20%. along with Pay Out Time Before Taxes (POTb) of 3 years (POTb requisite for high risk plant < 2 years) and Pay Out Time After Taxes (POTa) of 3,3 years in a row. Based on this economic evaluation, it can be concluded that dimethyl ether Plant of 10,000 ton/year is economically feasible.