Single step synthesis gas-to-dimethyl ether process with methano

Details Single step synthesis gas-to-dimethyl ether process with methano Single step synthesis gas-to-dimethyl ether process with methano

1998-12-17

2000-05-30

Geist, Gary

Chemistry: fischer-tropsch processes; or purification or recover

Liquid phase fischer-tropsch reaction

518714, 518728, C07C 2700

Patent

active

060691808

ABSTRACT:
A process is set forth for converting synthesis gas into dimethyl ether (DME) in a single step comprising contacting the synthesis gas with a bifunctional catalyst system having a methanol synthesis functionality and a methanol dehydration functionality. In particular, the present invention is an improvement to said process for increasing the stability of the bifunctional catalyst system, particularly when the process is conducted in the liquid phase. The improvement comprises introducing a methanol containing stream into the DME reactor such that the methanol concentration throughout the DME reactor is maintained at a concentration greater than 1.0%, generally between 4.0% and 8.0%. In one embodiment of the present invention, the methanol containing stream comprises at least a portion of the byproduct methanol from the DME reactor such that said portion of byproduct methanol is introduced into the DME reactor as a recycle stream.

REFERENCES:
patent: 4536485 (1985-08-01), Topp-Jorgensen
patent: 5753716 (1998-05-01), Peng et al.
"A Novel Mechanism of catalyst deactivation in Liquid Phase Synthesis Gas-to-DME Reactions", X. D. Peng, B. A. Toseland, R. P. Underwood, Stud. Surf. Sci. Catal. vol. 111, 1997, p. 175.
Dybkjaer and Hansen (Natural Gas Conversion IV, Studies in Surface Science and Catalysis, vol. 107, p. 99, 1997, Elsevier Science B. V.).
Xu et al. (Applied Catalysis A: General 149, 1997, p. 303-309).

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