Method for Synthesizing Methanol

Abstract

The invention relates to a process for the synthesis of methanol, wherein a hydrogen-containing stream (3) from a hydrogen recovery stage (4) is fed to a synthesis gas stream (2) comprising hydrogen and carbon oxides, and wherein the synthesis gas is The stream (2) is sent to the main reactor stage (5) to catalytically and partially convert the synthesis gas stream (2) into a gas mixture (6) with water, methanol and residual gas, and wherein the residual gas The first part (7) of is sent to the hydrogen recovery stage (4) to be split into a hydrogen-containing stream (3) and an off-gas stream (11). The process is characterized in that a second part ( 10 ) of the residual gas is fed to a secondary reactor stage ( 8 ) for further catalytic and at least partial conversion into a methanol-comprising product stream ( 9 ). The invention also relates to a plant for the synthesis of methanol.

Description

technical field [0001] The invention relates to a method for synthesizing methanol and a plant for synthesizing methanol. Background technique [0002] Methanol is often produced in large plants, in which fossil energy carriers such as coal or natural gas are first converted in an intermediate step into a synthesis gas consisting of hydrogen and carbon oxides, such as especially carbon monoxide. Next, the catalytic conversion of synthesis gas to methanol takes place in a corresponding reactor. The methanol-containing product stream from the reactor is then cooled and fed to a separator to obtain crude methanol, with the remaining residual gas passing through the reactor fully or partly into a recycle loop. [0003] Here, carbon monoxide and carbon dioxide can be converted catalytically with hydrogen into methanol and possibly water, respectively, in a manner known per se, wherein for as complete a reaction as possible of carbon oxides and hydrogen, a molar ratio S of essent...

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Problems solved by technology

[0005] However, the disadvantage of this approach is that the loss of carbon oxides in the gas supplied to the PSA for the methanol synthesis is proportional to the hydrogen additionally obtained for the methanol synthesis

In this regard, with respect to sources used to generate synthesis gas to reduce the yield of methanol

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