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Outline
Process Research on the Recovery and Utilization of Carbon Dioxide:
Dimethyl Ether and Ethylene Carbonate
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Process Research on the Recovery and Utilization of Carbon Dioxide:
Dimethyl Ether and Ethylene Carbonate
Since the Industrial Revolution, more and more greenhouse gases
have been released into the atmosphere and resulting in global
warming. The technology to recover and utilize CO2 has become an
ever important technique the worldwide. The aim of this study is to
transform the recovered CO2 into high-value-added chemicals:
dimethyl ether (DME) and ethylene carbonate (EC). It is noteworthy
that in the study we also design an MEA absorption unit to recover
CO2 flue gas in the DME process. The DME process consists of two
sections: one is the dry methane reforming process, the other is
the dimethyl ether synthesis. Having carried out the sensitivity
analysis using Aspen Plus software for the process, we are able to
select the reactor operation conditions: (1) dry methane reforming:
feed temperature is set at 900oC, feed pressure is set 1.3 bar and
the feed ratio of carbon dioxide to methane is 1.2:1; (2) DME
synthesis: pressure is set at 40 bar and temperature is set at 200.
The DME process simulates a plant capacity of 190,000 metric tons
per year of 99.5 mol% purity of dimethyl ether. To minimize the
reboiler’s heat duty for the distillation towers in the DME
process, we used a “three- step design procedure” for energy
savings. In addition, pinch technology is used to heat-integrate
the plant-wide DME synthesis. Ultimately, we also simulate the
CO2-capture process which targets at 99% of recovery and 99 mol% of
CO2 concentration. Note that there are two towers in the capture
process: an absorber and a stripper. The EC process also consists
of two sections: the first is to produce ethylene oxide (EO) and
the second is the ethylene carbonate synthesis. Similarly, we are
able to select the EC reactor operation conditions according to the
sensitivity results in using Aspen Plus: pressure is set at 98 bar,
temperature is set at 100 and the feed ratio of carbon dioxide to
ethylene oxide is 1.8. We used the ethylene oxidation process to
produce 99.5 mol% of ethylene oxide (EO). Then parts of EO flows
into the EC reactor and reacts with CO2 to obtain 99.5 mol% of
ethylene carbonate. The capacity of this EC process is 15,000
metric tons per year. Similarly, the pinch technology is also
applied to heat-integrate the plant-wide ethylene carbonate
synthesis. It should be mentioned that, in this thesis, the methane
dry reforming and the EO reactors system are designed on the basis
of the chemical kinetic principle, and both of DME and EC reactors
system are based on the chemical thermodynamic principle. Two kinds
of software are utilized in the researchAspen Plus and SuperTarget.
The first is applied to implement the process synthesis and design;
the second is applied to perform the pinch analysis and the
synthesis of heat exchanger network.
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indexSCIESSCI
Acceptance:
Editorial Times Acceptance
Springer
