1. Draw up a block flow diagram for this process. 2. Estimate the feeds for each stage. 3. Draw a flowsheet for the process. NOTE: Treat the C, compounds, other than isobutene, as one component. Data: 1. Feedstock composition, mol%: n-butane%3D2, butene-1 = 31, butene-2 = 18, isobutene = 49. %3D 2. Required production rate of MTBE, 7000 kg/h. 3. Reactor conversion of isobutene, 97%. 4. Recovery of MTBE from the distillation column, 99.5%. 5. Recovery of methanol in the absorption column, 99%. 6. Concentration of methanol in the solution leaving the absorption column, 15%. 7. Purge from the water recycle stream, to waste treatment, 10% of the flow leaving the methanol recovery column. 8. The gases leave the top of the absorption column saturated with water at 30°C. 9. Both columns operate at essentially atmospheric pressure.
1. Draw up a block flow diagram for this process. 2. Estimate the feeds for each stage. 3. Draw a flowsheet for the process. NOTE: Treat the C, compounds, other than isobutene, as one component. Data: 1. Feedstock composition, mol%: n-butane%3D2, butene-1 = 31, butene-2 = 18, isobutene = 49. %3D 2. Required production rate of MTBE, 7000 kg/h. 3. Reactor conversion of isobutene, 97%. 4. Recovery of MTBE from the distillation column, 99.5%. 5. Recovery of methanol in the absorption column, 99%. 6. Concentration of methanol in the solution leaving the absorption column, 15%. 7. Purge from the water recycle stream, to waste treatment, 10% of the flow leaving the methanol recovery column. 8. The gases leave the top of the absorption column saturated with water at 30°C. 9. Both columns operate at essentially atmospheric pressure.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Methyl tertiary butyl ether (MTBE) is used as an antiknock additive in gasoline.
It is manufactured by the reaction of isobutene with methanol. The reaction is
highly selective and practically any C4 stream containing isobutene can be
used as a feedstock:
CH2 = C(CH,)2 + CH;OH
(CH3);-C-O-CH;
%3D
A 10% excess of methanol is used to suppress side reactions.
In a typical process, the conversion of isobutene in the reactor stage is 97%.
The product is separated from the unreacted methanol and any C
compounds by distillation.
The essentially pure, liquid, MTBE leaves the base of the distillation column
and is sent to storage. The methanol and C, compounds leave the top of the
column as vapor and pass to a column where the methanol is separated by
absorption in water. The C, compounds leave the top of the absorption
column, saturated with water, and are used as a fuel gas. The methanol is
separated from the water solvent by distillation and recycled to the reactor
stage. The water, which leaves the base of the column, is recycled to the
absorption column. A purge is taken from the water recycle stream to prevent
the buildup of impurities.
Transcribed Image Text:1. Draw up a block flow diagram for this process.
2. Estimate the feeds for each stage.
3. Draw a flowsheet for the process.
NOTE: Treat the C compounds, other than isobutene, as one component.
Data:
1. Feedstock composition, mol%: n-butane32, butene-1 = 31, butene-2 = 18,
isobutene = 49.
2. Required production rate of MTBE, 7000 kg/h.
3. Reactor conversion of isobutene, 97%.
4. Recovery of MTBE from the distillation column, 99.5%.
5. Recovery of methanol in the absorption column, 99%.
6. Concentration of methanol in the solution leaving the absorption column, 15%.
7. Purge from the water recycle stream, to waste treatment, 10% of the flow
leaving the methanol recovery column.
8. The gases leave the top of the absorption column saturated with water at
30°C.
9. Both columns operate at essentially atmospheric pressure.
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