PROCESS FOR THE PREPARATION OF DIMETHYL ETHER

摘要

Process for the preparation of dimethyl ether product by catalytic conversion of synthesis gas to dimethyl ether comprising the steps of contacting a stream of synthesis gas comprising carbon dioxide in a dimethyl ether synthesis step in one or more reactors and with one or more catalysts active in the formation of methanol and dehydration of methanol to dimethyl ether and forming a product mixture comprising dimethyl ether, carbon dioxide and unconverted synthesis gas; cooling and separating the product mixture into a first liquid phase comprising dimethyl ether and carbon dioxide being dissolved in the formed dimethyl ether, and into a first gaseous phase comprising unconverted synthesis gas containing carbon monoxide and carbon dioxide; passing the first liquid phase to a scrubbing zone and contacting the phase with a liquid sorbent being effective in absorption of carbon dioxide; and withdrawing a dimethyl ether product being depleted in carbon dioxide from the scrubbing zone.

主权项

1. Process for the preparation of dimethyl ether product by catalytic conversion of synthesis gas to dimethyl ether comprising the steps of
contacting a stream of synthesis gas in a dimethyl ether synthesis step in one or more reactors and with one or more catalysts active in the formation of methanol to dimethyl ether and forming a product mixture comprising dimethyl ether, carbon dioxide and un-converted synthesis gas; cooling and separating the product mixture into a first liquid phase comprising dimethyl ether and carbon dioxide dissolved in the formed dimethyl ether, and into a first pressurized gaseous phase comprising unconverted synthesis gas containing carbon monoxide and carbon dioxide; passing the first liquid phase to a scrubbing zone and contacting the phase with a liquid sorbent containing potassium barconate or amine, said sorbent being effective in absorption of carbon dioxide; and withdrawing a dimethyl ether product depleted in carbon dioxide from the scrubbing zone.