Method for preparing dimethyl ether
A technology of dimethyl ether and methanol, which is applied in the field of preparation of dimethyl ether, can solve the unmentioned problems such as the formation of carbamate and formate, and the removal of unresolved carbon dioxide
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Embodiment 1
[0049] This is a comparative example according to the prior art disclosed in US 7,652,176 and does not feature any separation steps before introducing the product stream to the scrubbing zone.
[0050] The synthesis gas with the composition in Table 1 is sent to the DME synthesis reactor to generate methanol and DME through catalytic conversion in the boiling water reactor according to the chemical equation (1)~(3) under 8MPa, and produce methanol and DME after it is cooled. Product stream 2 introduced to the potassium carbonate or amine rich scrubbing zone.
[0051] Table 1
[0052] (mol%)
Embodiment 2
[0054] This is how figure 1 The shown example according to an embodiment of the invention features a cooling and concentration step before introducing the liquid phase into the potassium carbonate or amine rich scrubbing zone. Table 2 shows the composition of the streams, and the numbers of the streams refer to figure 1 . Syngas 1 had the same composition as Comparative Example 1 and was converted under the same conditions.
[0055] Table 2
[0056]
[0057] In contrast to Comparative Example 1, Example 2 shows that the carbon monoxide concentration of the gas passed to the scrubbing zone is reduced from 11.4 mol% (Example 1) to 8.6 mol% (combined stream 5 and stream 6c), thereby reducing scrubbing Solvent degradation, as mentioned above.
Embodiment 3
[0059] This example is similar to Example 2, except that the recirculation stream 6a is increased from 10kmol / h (R / M=0.1) to 50kmol / h (R / M=0.5), where R / M represents recirculation supplement gas ratio. Flow data are shown in Table 3.
[0060] table 3
[0061] (mol%)
[0062] Example 3 shows that the concentration of carbon monoxide in the product stream (5+6c) sent to the scrubbing zone can be controlled / reduced by adjusting / increasing the recovery ratio. In Example 3, the carbon monoxide concentration of the gas passed to the scrubbing zone was further reduced from 8.6 mol% (Example 2) to 3.8 mol% (by combining stream 5 and stream 6c).
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