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Executive Summary Rancangan Pabrik Dimetil Eter Teknologi Toyo Engineering Dengan Desain Alat Utama Reaktor Dehidrasi Metanol (R-401)
ABSTRACT
The plant is planned to be located in Pauh Ranap Village, Peranap Subdistrict, Indragiri Hulu Regency, Riau Province. Coal will serve as the raw material for DME production through a gasification process to produce syngas, which will then be synthesized into methanol. The methanol will then undergo dehydration to produce the final DME product. DME is targeted to be an additive or substitute in liquefied petroleum gas (LPG) because it has similar properties to propane and butane. DME can be sold at a lower price than LPG and is more environmentally friendly due to its C-H and C-O bonds containing 35% O2, which results in lower CO and emissions during combustion compared to natural gas. The demand for DME in Indonesia is estimated to be between 3.16 and 2.08 million tons per year until 2045. The DME plant is planned to meet the demand for DME as a substitute for LPG on the island of Sumatra.
The process used to produce DME is the indirect process. Coal is gasified to produce syngas, which is then fed into a water-gas shift (WGS) reactor to adjust its composition for methanol synthesis. The methanol produced from the syngas is then fed into a methanol dehydration reactor to produce DME. The plant requires 83 MW of power, 300 tons/hour of steam, and 6,250 tons/hour of cooling water. The plant's utility system is designed with a cogeneration system, where power and steam are generated simultaneously. To meet the power requirements, the plant needs 86,899 tons of coal per year and 396,761 tons of natural gas per year as fuel. The plant's waste is treated using an activated sludge process to reduce the chemical oxygen demand (COD) and biological oxygen demand (BOD) levels in the wastewater.
The economic analysis indicates that the total capital investment (TCI) required is Rp. 7,594,628,874,270, with a total production cost (TPC) of Rp. 1,015,157,082,481 per year. The annual sales revenue is estimated to be Rp. 2,716,178,640,000. The profitability analysis yields a payback period (PBP) of 3.46 years, a break-even point (BEP) at 26% production capacity, an internal rate of return (IRR) of 24.28%, and a net present value (NPV) of Rp. 616,592,995,946 at a 20% discount rate. The profitability analysis demonstrates that the DME plant from coal is feasible to establish and represents an attractive investment
Key word : Dimethyl Ether, Dehydration of Methanol, TOYO Engineering, Sensitivity Analysis
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