CO{sub 2}/dimethyl ether (DME) feed mixtures in the DME-to-hydrocarbon (DTH) process
- Univ. of Akron, OH (United States)
The DTH process represents the second stage in the conversion of syngas to hydrocarbons, where DME produced from the LPDME process is converted to C{sub 1}-C{sub 10} range hydrocarbons over a zeolite type catalyst in a fixed-bed tubular reactor. The reaction occurs in the vapor phase and typically operates at a temperature of 375 C. The product distribution can be can be controlled by varying the operating temperature, pressure and space velocity of DME. Previous investigations have examined the effects of T, P, WHSV, and catalyst type on olefin productivity as well as the processing advantages in starting with DME rather than MeOH. Unreacted CO{sub 2} from the DME synthesis reactor represents a potential problem in terms of further hydrocarbon processing from a DME feedstock; CO{sub 2}/DME mixtures are difficult to separate. A productivity comparison has been made with runs containing feed mixtures of CO{sub 2}/DME and N{sub 2}/DME mixtures. The role of CO{sub 2} on the final product distribution in the DTH process as well as the potential for recycle of unreacted CO{sub 2} back to the DME synthesis reactor has been examined. It has been found that CO{sub 2} is not actively involved in the reaction kinetics for the conversion of DME to hydrocarbons. Product distributions of the gaseous product are similar to those where N{sub 2} was used as the diluent.
- OSTI ID:
- 257132
- Report Number(s):
- CONF-950952-; TRN: IM9631%%338
- Resource Relation:
- Conference: 12. annual international Pittsburgh coal conference, Pittsburgh, PA (United States), 11-15 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of Twelfth annual international Pittsburgh coal conference: Proceedings. Coal -- Energy and the environment; PB: 1248 p.
- Country of Publication:
- United States
- Language:
- English
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