PRARANCANGAN PABRIK POLYSTYRENE DARI STYRENE MONOMER DENGAN KAPASITAS 50.000 TON / TAHUN

Polystyrene is a polymer substance made from monomer styrene which leads to production of casing, insulator, food-wrapper and resin. The opportunity of polystyrene industry to develop in Indonesia is quite big, by considering the fact that in 2011, the value of Indonesian product resulted from import activity has reached 45.309 ton in total. The factory is designed to operate for 330 days/year consecutively with polystyrene production capacity of 50.000 ton/year. The main raw material needed is styrene monomer 50.468,284 ton/year, ethylbenzene 1.286,1804 to/year, and benzoyl peroxide 58,6389 ton/year. The production of polystyrene involving a reaction of addition polymerization and is done by polymerization solution method. Generally, polymerization production follows these sequent steps, which are: (i) reaction between styrene monomer, ethylbenzene and benzoyl peroxide inside a continuous stirred tank reactor, (ii) separation of polymerization product by one stage distillation process, and (iii) compaction process of polystyrene by using extruder. As a support for these activities, utility unit will supply the need of cold water 53.628,2688 kg/hour, electricity 914,98 kVA, and steam 1856,0295 kg/hour. The factory will be built in Cilegon which is located in Banten province. This decision made by considering the raw material oriented. Cilegon area is located close to both monomer styrene industry and harbor which will help the distribution of polystyrene production way much easier. Besides, the location of the factory is also close to a river. Therefore the river will supply the water source for the utility unit. The calculation of economy evaluation gives result in $24.060.164,71 of the fixed capital and $16.402.314,40 of the working capital. When the capacity production reaches 80% , the ROI before tax achieved will be 31,01% and ROI after tax 15,51