Methanol recovery method

Abstract

The invention provides a methanol recovery method. The methanol recovery method includes the steps of providing a methanol recovery device comprising an atmospheric tower and a pressurized tower connected with the atmospheric tower; dividing crude methanol raw materials into a group-A raw material and a group-B raw material according to a mass ratio of 1.5-10:1, and adding the group-A raw material into the atmospheric tower for atmospheric pressure rectification so as to obtain atmospheric tower steam and atmospheric tower bottoms; adding the atmospheric tower bottoms and the group-B raw material into the pressurized tower for pressurized rectification so as to obtain pressurized tower methanol steam which is used for providing heat for atmospheric pressure rectification. The methanol recovery method has the advantages that a specific quantity of crude methanol raw materials are added into the atmospheric tower and the pressurized tower respectively, and condensation heat of the methanol steam produced by the pressurized tower is just required by a reboiler of the atmospheric tower, so that pressurized tower top methanol steam heat utilization ratio is increased; additionally, vapor-liquid load of the atmospheric tower and the pressurized tower is in the superior state, so that the tower diameters of the atmospheric tower and the pressurized tower are decreased, and equipment investment is reduced.

Description

technical field

[0001] The invention relates to the technical field of separation of chemical industry and medicine, in particular to a methanol recovery method. Background technique

[0002] Methanol is an important organic chemical raw material. With the development of economy and the increasingly tight energy sources, people have higher and higher requirements for energy saving and consumption reduction in chemical production. The design optimization of methanol recovery unit has become one of the important research projects of methanol process in the future.

[0003] At present, the recovery method of methanol often adopts atmospheric rectification, but this method consumes a lot of energy, and the recoverable heat is very small, and most of the heat is not easy to be recovered by conventional heat exchange methods. Therefore, it is necessary to adopt a new methanol recovery method to improve the utilization rate of the heat energy carried by the gas during the methanol...

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