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A vacuum thermal coupling methanol rectification method and device

A technology of methanol rectification and vacuum rectification tower is applied in the field of vacuum thermal coupling methanol rectification method and device, and can solve the problems of unfavorable stable operation of the device and limited energy saving effect.

Active Publication Date: 2021-12-24
PEI YANG NAT DISTILLATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the impurity content in the crude methanol raw material changes, or the tower operating parameters are fine-tuned, it will be unfavorable to the stable operation of the entire device
[0006] Chinese patent CN 200910022575.2 discloses a "methanol multi-effect rectification process", which is characterized in that: there is also the problem of double-effect rectification in the pre-rectification tower and recovery tower
[0007] Chinese patent CN 200710146369.3 discloses a "vacuum countercurrent double-effect rectification method and equipment for refining crude methanol", which is characterized in that the countercurrent double-effect rectification is carried out through a decompression tower and a micro-pressurization tower. Certain energy-saving effect, but the essence is still double-effect rectification, the energy-saving effect is limited

Method used

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  • A vacuum thermal coupling methanol rectification method and device
  • A vacuum thermal coupling methanol rectification method and device
  • A vacuum thermal coupling methanol rectification method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, as figure 2 Shown:

[0029]The crude methanol raw material enters the raw material preheater 19 after being treated with lye, and enters the pre-rectification tower 1 after being preheated to about the bubble point temperature, and light impurities (dimethyl ether, methyl formate and alkanes, etc.) are separated in the pre-rectification tower ). The operating pressure of the pre-rectification tower 1 is 0.03-0.1MpaG, the temperature at the top of the tower is 75-80°C, and the temperature at the bottom of the tower is 82-95°C; The condensed liquid mixture enters the reflux tank 3 of the pre-rectification tower, the liquid phase is refluxed to the top of the tower, and the non-condensable equilibrium gas is recycled. The material in the bottom of the pre-rectification tower enters the atmospheric rectification tower 8 . The pre-rectification column reboiler 4 uses steam as a heat source.

[0030] The operating pressure of the atmospheric rectification t...

Embodiment 2

[0034] Embodiment 2, a set of 1 million tons / year methanol rectification device. The process of "a vacuum thermally coupled methanol rectification method and device" in Example 1 was adopted. When the content of ethanol and acetone is not high in the crude methanol raw material, the national standard grade methanol is produced, and the specific relevant parameters are as follows:

[0035] Table 1 crude methanol raw material composition (mass percent %)

[0036]

[0037] Table 2 Tower Equipment Parameters

[0038]

[0039]

[0040] Table 3 Product Index and Consumption

[0041]

Embodiment 3

[0042] Embodiment 3, a set of 1 million tons / year methanol rectification device. The process of "a vacuum thermally coupled methanol rectification method and device" in Example 1 was adopted. In the crude methanol raw material, when ethanol and acetone content are not high, AA grade methanol is produced, and the specific relevant parameters are as follows:

[0043] Table 4 crude methanol raw material composition (mass percent %)

[0044]

[0045] Table 5 Tower Equipment Parameters

[0046]

[0047] Table 6 Product Index and Consumption

[0048]

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Abstract

The invention relates to a vacuum heat coupled methanol rectification method and device. The crude methanol raw material enters the pre-rectification tower after being preheated, and light impurities are removed from the top of the tower. The rectification tower is connected, the material in the bottom of the pressurized rectification tower is connected with the vacuum rectification tower, and the material extracted from the side line of the vacuum rectification tower is connected with the recovery tower. Atmospheric pressure, pressurization, and vacuum three-effect thermal coupling are adopted. The top vapor of the pressurized rectification tower is connected to the reboiler of the atmospheric rectification tower, and the top vapor of the atmospheric rectification tower is connected to the reboiler of the vacuum rectification tower. The methanol product in the reflux tank of the pressurized rectification column is connected to the reboiler of the recovery column. Methanol products are extracted from the top of the pressurized rectification tower, atmospheric rectification tower, and vacuum rectification tower, and methanol fuel oil is extracted from the top of the recovery tower. The invention overcomes the defects of the prior art and saves energy consumption by 30% to 40%. It can produce national standard grade and American AA grade pure methanol, and has a very broad application prospect.

Description

technical field [0001] The invention relates to the technical field of chemical distillation, in particular to a vacuum thermally coupled methanol distillation method and device. Background technique [0002] Methanol is an important organic chemical raw material and a clean energy and power fuel with excellent performance. With the successful application of methanol-to-olefins and dimethyl ether-to-dimethyl ether technologies, not only the number of methanol plants is increasing, but also the scale is rapidly increasing. Methanol rectification is an extremely critical unit in methanol production equipment, which is directly related to the quality of refined methanol products, and its energy consumption accounts for about 20% of the total energy consumption of the entire methanol production. Therefore, improving the quality of refined methanol products, reducing production energy consumption and waste disposal has attracted more and more attention, and has become the key to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/04C07C29/80B01D3/14B01D3/32
CPCB01D3/143B01D3/322C07C29/80C07C31/04
Inventor 丛山田玉峰李斌刘璐杨祖杰李鑫钢
Owner PEI YANG NAT DISTILLATION TECH
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