DESIGN OF A PLANT TO PRODUCE 60,000 TONNES OF 2-ETHYL HEXANOL FROM PROPELENE AND SYNTHESIS GAS

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DESIGN OF A PLANT TO PRODUCE 60,000 TONNES OF 2-ETHYL HEXANOL FROM PROPYLENE AND SYNTHESIS GAS

ABSTRACT

Plant design which is an iterative procedure with a route of the procession from the input or feed to the stated objectives, amidst intervening constraints, requires careful, well-thought-out, comprehensive specifications of the defined or desired requirements.

The stated objective, in this case, is the design of a 60,000 tons/year capacity of a 2- Ethyl Hexanol (C8H18O) Plant. While many processes exist at producing 2-Ethyl Hexanol (2- EH), such as the Acetaldehyde Route and others developed by Shell Corporation, etc., the Oxo Process route utilizing propylene and synthesis gas as feed components were the selected route for this design work. However, important modifications were implemented to the process description for effective process optimization, such as to improve the conversion of efficiencies of process equipment by the aid of recycling processes.

The oxo synthesis began by reacting propylene feed and synthesis gas (CO + H2) in Rhodium triphenylphosphine catalyzed hydroformylation reaction.

An acceptable design must present a process that is capable of operating under conditions that will yield a profit. A simple costing procedure was carried out for the 2- EH Plant to determine if the design is feasible economically or not based on certain estimates.

Estimates were prepared using data and Chemical Engineering plant cost index method in Literature, considering Port Harcourt, Rivers State, Nigeria as the location of the plant. The old cost information was obtained and extrapolated using the Index Method to the present 2016 costs. These costs were evaluated in U. S dollars. The Purchased Cost of Equipment (PCE) was valued at $3,150,153.93, while the Physical

Plant Costs (PPC) or direct costs were obtained by the factorial costing method at 3.4 times PCE and valued at $10,62,544.69. Indirect costs were the expenses that are not directly involved with material and labor which included design and engineering, contractor’s fee, etc, and were valued at $5,040,246.29. The Fixed Capital Investment (FCI) was obtained by summing up the direct and indirect costs and valued at $16,002,790.98. The Working Capital was 12% of the FCI and both gave the Total Capital Investment of $17,923,125.90. The start-up cost of the plant for production was evaluated at 10% of TCI.

With a selling price at $1.74/kg, the 60,000 tons/year of 2- Ethyl hexanol plant is expected to have a net profit of $22,125,469.76 and a payback period of 2.8 years. However, procedures for safe operation and start-up of the 60,000 tons/year 2-Ethylhexanol Plant was documented

 

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