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Six-tower reverse quadruple-effect methanol rectification method using pre-rectification tower as heat source

A pre-distillation tower and heat source technology, applied in the field of rectification, can solve the problems of difficult production requirements and high energy consumption, and achieve the effect of improving the utilization rate of raw materials

Pending Publication Date: 2021-11-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The traditional three-tower and four-tower methanol distillation process consumes a lot of energy, and the products obtained are difficult to meet the more stringent production requirements today. Under such circumstances, it is particularly important to propose a new energy-saving method for methanol distillation

Method used

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  • Six-tower reverse quadruple-effect methanol rectification method using pre-rectification tower as heat source
  • Six-tower reverse quadruple-effect methanol rectification method using pre-rectification tower as heat source

Examples

Experimental program
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Effect test

Embodiment 1

[0036] like figure 1 As shown, the six-tower reverse four-effect methanol rectification method with the pre-rectification tower as the heat source is connected as follows: the bottom of the pre-rectification tower T1 is connected to the middle and lower part of the vacuum tower T2 through pipelines; the bottom of the vacuum tower T2 The bottom of the atmospheric tower T3 is connected to the middle and lower part of the medium-pressure tower T4 through pipelines; the bottom of the medium-pressure tower T4 is connected to the middle and lower part of the high-pressure tower T5 through pipelines; The side draw of the high-pressure tower T5 is connected to the middle and lower part of the recovery tower T6 through pipelines.

[0037]The present invention adopts four-effect rectification technology, and its technological process comprises the following steps: 1) crude methanol raw material enters pre-rectification tower T1, extracts noncondensable gas and methanol oil; the bottom p...

Embodiment 2

[0041] like figure 2 As shown, the improved device based on the six-tower reverse four-effect methanol rectification method based on the pre-rectification tower as the heat source, its main process flow is the same as figure 1 The multi-effect distillation process is basically the same, the difference is that the water tower T6 is not equipped with a reboiler, and forms a fully coupled state with the lower half of the high-pressure tower T5, and the top of the water tower T6 can obtain a mixed alcohol fuel product with a water content of less than 1000ppm. Qualified purified wastewater is obtained from the bottom of tower T5 and enters the subsequent wastewater treatment system.

[0042] Compared with the existing industrial process, the steam consumption per unit of methanol in this process scheme is 0.5-0.65, which is lower than the unit consumption of methanol / steam in the three-tower and four-tower process (unit consumption is 1.1-1.5), which is different from our propose...

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Abstract

The invention discloses a six-tower reverse quadruple-effect methanol rectification method using a pre-rectification tower as a heat source. The bottom of a pre-rectification tower is connected with the middle-lower part of a vacuum tower through a pipeline; the bottom of the vacuum tower is connected with the middle lower part of an atmospheric tower through a pipeline; the bottom of the atmospheric tower is connected with the middle-lower part of the medium-pressure tower through a pipeline; the bottom of the medium-pressure tower is connected with the middle lower part of the high-pressure tower through a pipeline; and the side-draw of the high-pressure tower is connected with the middle lower part of a recovery tower through a pipeline. The core steps are as follows: the pre-rectification tower is used as one of heat sources, and tower top material steam of the pre-rectification tower and tower top material steam of the atmospheric tower supply heat to the vacuum tower until complete condensation; the tower top material steam of the medium-pressure tower supplies heat to the atmospheric tower until complete condensation; and the tower top material steam of the high-pressure tower supplies heat to the medium-pressure tower until complete condensation. According to the invention, an obvious energy-saving effect of the methanol rectification process flow is realized. Meanwhile, the invention also provides an improved six-tower reverse quadruple-effect methanol rectification process taking a pre-rectification tower as a heat source, and provides a new energy-saving methanol rectification choice.

Description

technical field [0001] The invention belongs to the technical field of rectification, and relates to an energy-saving process for methanol separation and purification in the production process of coal-based methanol, in particular to a six-tower reverse four-effect methanol rectification method using a pre-rectification tower as a heat source. Background technique [0002] Methanol, a bulk chemical basic raw material, is widely used in the fields of fine chemicals, polymers, pesticides, medicine and energy, and has an extremely important position in the international chemical market. [0003] Based on the reality of my country's actual national conditions of rich coal, poor oil and little gas, the coal-based methanol production process has a natural competitive advantage in the field of crude methanol preparation. However, the crude methanol prepared by this method usually contains light component impurities such as dimethyl ether and heavy component impurities such as ethan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14B01D3/32C07C29/80C07C31/04
CPCB01D3/146B01D3/32C07C29/80C07C31/04Y02P20/10Y02P20/50
Inventor 孙津生刘道岩王家豪
Owner TIANJIN UNIV