ETHYLHEXANOL FROM PROPYLENE AND SYNTHESIS GAS DOCX

Title ETHYLHEXANOL FROM PROPYLENE AND SYNTHESIS GAS
Author Jason Pestaño
Pages 2
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File Type DOCX
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Summary

ETHYLHEXANOL FROM PROPYLENE AND SYNTHESIS GAS Introduction The aim of the project is to design a plant that produces 40,000 tons/year of 2- ethylhexanol from propylene and synthesis gas. The assumption is that the operating period is 8000 hours on stream. The process involves the main reaction which...

Description

ETHYLHEXANOL FROM PROPYLENE AND SYNTHESIS GAS Introduction The aim of the project is to design a plant that produces 40,000 tons/year of 2- ethylhexanol from propylene and synthesis gas. The assumption is that the operating period is 8000 hours on stream. The process involves the main reaction which produces n-butyraldehyde, followed by a gas-liquid separation that yields a liquid phase which is passed through a distillation column to obtain a stream rich in n-butyraldehyde that is then treated with sodium hydroxide and undergoes condensation to produce 2-ethylhexanal and reduced to 2-ethylhexanol. The first stage is the a hydroformylation (oxo) reaction with a main product of n- butyraldehyde which is needed for the conversion to 2-ethylhexanol. Feeds to the reactor used are a CO/H2 mixture synthesis gas and propylene in the molar ratio of 2:1, and the catalyst being used is cobalt carbnyl. The synthesis gas is obtained from heavy fuel oil after the removal of sulfur compounds and CO2 with composition of 48.6% H2,49.5% CO, 0.4% CH4 and 1.5% N2. The composition of the propylene feed is 93% propylene and 7% propane. The operating conditions which this reaction is carried out is at 130°C and 350 bar. This reaction produces a solution of n-butyraldehyde and isobutyraldehyde in the ratio of 4:1. Of the propylene feed, 3% is converted to propane and some do not react. Within the reactor, 6% of the n-butyraldehyde product is reduced to n-butanol and 4% of the isobutyraldehyde product is reduced to isobutanol along with other reactions that occur that yields high molecular weight compounds (heavy ends) of about 1% by weight of the butyraldehyde-butanol mixture at the reactor exit. The second stage which is a gas-liquid separator that operates at 30 bar heats the liquid phase with steam to decompose the cobalt carbonyl catalyst for its recovery by filtration. The third stage is another gas-liquid separator that operates at atmospheric conditions that yields a liquid phase of aldehydes, alcohols, heavy ends and water, free from propane, propylene, CO and H2. The fourth and fifth stages are two distillation columns. The first column gives a top product of mixed butyraldehydes which is then passed through the second column which...

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