Continuous process for the preparation of methanol by hydrogenation of carbon dioxide

A.A. Kiss (Inventor), J.J. Pragt (Inventor), M.M. van Iersel (Inventor), G. Bargeman (Inventor), M.T. de Groot (Inventor)

Research output: PatentPatent publication

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Abstract

The present invention pertains to a continuous process for the preparation of methanol by hydrogenation of carbon dioxide in the presence of a solid catalyst comprising the steps of (i) feeding a feed comprising carbon dioxide; and at least part of a first recycle gas stream comprising carbon dioxide and hydrogen,to a reactor, to obtain a gaseous feed with a hydrogen:carbon dioxide molar ratio of between 2-18 : 1; (ii) contacting said gaseous feed with a catalyst at a temperature of between200 and 300°C and a pressure of between 40 and 200 bar, thereby forming an outlet stream comprising methanol, water, carbon monoxide, carbon dioxide, and hydrogen; (iii) cooling the outlet stream; (iv) subjecting said outlet stream to a separation step, while optionally at least part of a second recycle gas stream is added to said outlet stream comprising methanol prior to and/or during said separation step, in which separation step methanol and water are separated from non-condensable components, thereby forming a methanol-comprising product stream and a first recycle gas stream; (v) stripping the methanol-comprising product stream using a hydrogen stream, thereby forming a purified methanol product stream and a second recycle gas stream; and (vi)feeding at least part of the first recycle gas stream to step (i) and at least part of the second recycle gas stream to steps (i) and/or (iv).
Original languageEnglish
Patent numberWO2013144041
Publication statusPublished - 3 Oct 2013
Externally publishedYes

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