Methanol recovery method

A methanol recovery and methanol vapor technology, which is applied in the fields of pharmaceutical separation and chemical industry, can solve the problems of high energy consumption and small heat, and achieve the effects of low heat energy consumption, high heat energy utilization rate and energy consumption reduction.

Active Publication Date: 2016-06-08
SHENZHEN CANDORTECH INC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the recovery method of methanol often adopts atmospheric rectification, but this method consumes a lot of energy, and the heat that can be recovered is very small, and most of the heat is not easy to be recovered by conventional heat exchange methods.

Method used

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  • Methanol recovery method
  • Methanol recovery method
  • Methanol recovery method

Examples

Experimental program
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Effect test

Embodiment 1

[0057] refer to figure 1 , a method for methanol recovery, comprising the following steps:

[0058] A methanol recovery unit is provided. The methanol recovery unit includes a preheater 3, an atmospheric column 1, a condenser 7 located at the top of the atmospheric column, a reflux tank 8 and a reflux pump 6, a reboiler 4 located at the bottom of the atmospheric column, The pressurization tower 2 connected with the atmospheric tower, the reflux tank 9 and the reflux pump 10 at the top of the pressurization tower 2, the reboiler 11 at the bottom of the pressurization tower;

[0059] The crude methanol raw material is divided into A-share raw material 24 and B-share raw material 25 with a mass ratio of 1.5:1, the concentration of methanol in the crude methanol raw material is not less than 50%, and the A-share raw material 24 is heated to about 70°C through the preheater 3 Afterwards, join in the atmospheric column 1 by feed port 12 and carry out atmospheric rectification, obta...

Embodiment 2

[0062] A method for recovering methanol, comprising the steps of:

[0063] The steps of embodiment 2 and embodiment 1 are the same, the difference is: the mass ratio of A stock raw material and B stock raw material in embodiment 2 is 2:1.

Embodiment 3

[0065] A method for recovering methanol, comprising the steps of:

[0066] The steps of embodiment 3 and embodiment 1 are the same, the difference is: the mass ratio of A stock raw material and B stock raw material is 4:1 in embodiment 3.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/80
CPCC07C29/80C07C31/04
Inventor 胡坤陆为民李果陈超
Owner SHENZHEN CANDORTECH INC CO
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