Page 95 - Analysis, Synthesis and Design of Chemical Processes, Third Edition
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methanol and ethanol streams. Two reaction trains are used: one for DME and the other for DEE
production. This allows the production of DME and DEE to be optimized separately and eliminates
problems associated with the DME-ethanol azeotrope. However, there are two reactors and at least one
more separation (column).
Figure E2.6(c) Structure of Process for Alternative 2 in Example 2.6
Alternative 3
This option is a hybrid between batch and continuous processes. The methanol is continuously separated
from ethanol in the first column. However, the same equipment is used to produce both DME and DEE but
at different times. The equipment is run in two “campaigns” per year. In the first campaign (Figure
E2.6[d]), DME is produced and ethanol is stored for use in the second campaign.
Figure E2.6(d) Structure of Process for Alternative 3—DME Campaign in Example 2.6
