Method and system for producing methanol and dimethyl ether

摘要

In the production of purified methanol and/or dimethyl ether from crude methanol, the crude methanol is processed in at least one prepurification stage, a first partial stream of the prepurified methanol is supplied to a final methanol purification and a second partial stream of the prepurified methanol is supplied to a reactor and at least partly converted to dimethyl ether. The dimethyl ether recovered is purified in at least one purification stage, wherein non-reacted methanol is withdrawn from the dimethyl ether purification stage and at least partly supplied to the final methanol purification. In this way, both purified methanol and dimethyl ether can be produced in parallel, wherein the quantities of both products obtained are flexibly adjustable.

主权项

1. A process for producing purified methanol and/or dimethyl ether from crude methanol, comprising
processing the crude methanol in at least one prepurification stage, supplying a first partial stream of the prepurified methanol to a final methanol purification, and supplying a second partial stream of the prepurified methanol to a reactor and at least partially converting the second partial stream to dimethyl ether, and recovering the dimethyl ether and purifying the dimethyl ether in at least one purification stage, and withdrawing non-reacted methanol from the dimethyl ether purification stage and at least partially supplying the non-reacted methanol to the final methanol purification, wherein the final purification of the methanol is performed in a first column, which is operated under elevated pressure and in a second column which is operated under atmospheric pressure; wherein purified methanol from the atmospheric column is fed into the dimethyl ether production.