Method and device for manufacturing dimethyl carbonate
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsKazuto Kobayashi, Hiroyuki Osora, Yoshio Seiki, Masaki Iijima
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Abstract
The present invention provides a method and apparatus for producing dimethyl carbonate, wherein carbon dioxide is recovered from combustion exhaust gas of a steam reformer 10 and a boiler; and some of the recovered carbon dioxide is used for methanol synthesis as a raw material for the steam reformer 10, and the remaining carbon dioxide is allowed to react with some of the yielded methanol to synthesize dimethyl carbonate. According to the present invention, CO2, which has conventionally been discharged, is returned to the steam reformer and is used effectively to produce DMC, and also devices for producing methanol and DMC can be simplified.
Claims16
A method for producing dimethyl carbonate in which a synthesis gas mainly consisting of hydrogen, carbon monoxide, and carbon dioxide is synthesized by supplying raw material hydrocarbon and steam to a reformer of an external heating system;
- methanol is synthesized by allowing the synthesis gas to react over a catalyst;
- and dimethyl carbonate is produced by adding carbon dioxide to the methanol, wherein
- carbon dioxide in combustion exhaust gas discharged from a combustion radiation section for heating a reaction tube of the reformer is recovered;
- some or all of the recovered carbon dioxide is mixed in the raw material hydrocarbon to synthesize methanol;
- and all or some of the remaining carbon dioxide is added to the synthesized methanol to synthesize dimethyl carbonate.
An apparatus for producing dimethyl carbonate, comprising a reformer of an external heating system including a steam reforming reaction tube and a combustion radiation section arranged around the reaction tube, which synthesizes a synthesis gas containing carbon monoxide and carbon dioxide by supplying raw material hydrocarbon and steam;
- a methanol synthesizing means for synthesizing methanol by allowing the synthesis gas to react over a catalyst;
- and a dimethyl carbonate producing means for producing dimethyl carbonate by adding carbon dioxide to the synthesized methanol, wherein
- the apparatus further comprises a carbon dioxide recovering device for recovering carbon dioxide in combustion exhaust gas discharged from the combustion radiation section of the reformer;
- a mixing means of the recovered carbon dioxide in the raw material hydrocarbon, in which some or all of the recovered carbon dioxide is mixed in the raw material hydrocarbon to synthesize methanol;
- and a mixing means of the recovered carbon dioxide in methanol, in which all or some of the remaining carbon dioxide is added to the synthesized methanol to synthesize dimethyl carbonate.
Dependencies are inferred from the claim text.