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Method and device for refining methanol through dividing wall column combined with heat pump

A dividing wall rectification tower and refined methanol technology, applied in the chemical industry, can solve the problems of low product quality, high energy consumption in the methanol refining process, and large equipment footprint, achieving high purity, remarkable energy-saving effect, and reduced land occupation area effect

Active Publication Date: 2016-01-06
HANGZHOU ZJU HOLLEY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the objectives of the present invention is to provide a method and device for refining methanol using a dividing wall rectification tower combined with a heat pump to solve the problems of large energy consumption, large equipment footprint and low product quality in the existing methanol refining process

Method used

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  • Method and device for refining methanol through dividing wall column combined with heat pump
  • Method and device for refining methanol through dividing wall column combined with heat pump
  • Method and device for refining methanol through dividing wall column combined with heat pump

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Embodiment 1

[0045] Such as figure 1 As shown, a device for refining methanol using a dividing wall distillation column combined with heat pump technology, including a crude methanol preheater 12, a dividing wall distillation column 11, a dividing wall distillation column condenser 13, a compressor 14, a dividing wall refiner Distillation column reboiler 15 and refined methanol delivery pump 16. A vertical dividing wall is provided in the dividing wall rectifying column 11, and the height of the dividing wall is 2 / 3 of the total height of the dividing wall rectifying column 11, and the top of the dividing wall extends upwards and is fixed with the top of the dividing wall rectifying column 11. The upper rectification section of the dividing wall rectification column 11 is divided into two parts, the feed side and the non-feed side, wherein the middle part of the tower wall on the feed side is provided with a feed port, and the top of the side tower is provided with a light component discha...

Embodiment 2

[0057] Such as figure 2 As shown, a device for refining methanol using a dividing wall distillation column combined with heat pump technology, including a crude methanol preheater 22, a dividing wall distillation column 21, a light component compressor 23, an intermediate reboiler 24, and a refined methanol compressor Machine 25, dividing wall rectification column reboiler 26 and refined methanol delivery pump 27. A vertical dividing wall is provided in the dividing wall rectifying tower 21, and the height of the dividing wall is 2 / 3 of the total height of the dividing wall rectifying tower 21, and the top of the dividing wall extends upwards and is fixed with the top of the dividing wall rectifying tower 21. The upper rectification section of the dividing wall rectification column 21 is divided into two parts, the feed side and the non-feed side, wherein the middle part of the tower wall on the feed side is provided with a feed port, and the top of the side tower is provided...

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Abstract

The invention discloses a method for refining methanol through a dividing wall column combined with a heat pump. The method comprises the steps of preheating coarse methanol, then introducing the coarse methanol into the dividing wall column with a stripping section shared, and conducting rectification treatment; obtaining light component impurities from the part, located at the feed side, of the top of the dividing wall column, and extracting the light component impurities after condensation is conducted; obtaining heavy component impurities containing non-volatile impurities at the column bottom; obtaining refined methanol vapor from the part, located at the non-feed side, of the top of the dividing wall column wherein after the energy grade of the refined methanol vapor is raised through pressurization of a compressor, the refined methanol vapor is used as a heat source of a dividing wall column reboiler, and obtaining refined methanol after heat exchange and condensation are completed. The invention further discloses a device for refining methanol through the dividing wall column combined with the heat pump. By means of the method and device for refining methanol through the dividing wall column combined with the heat pump, heat is utilized reasonably, and process energy consumption is greatly lowered; the operation capacity is large, and the energy conservation effect is remarkable; the equipment size is small, and the occupied area is reduced; operation is conducted under a normal pressure condition, corrosion to equipment caused by the impurities is avoided, material requirements of the equipment are lowered, and equipment investment is saved; the impurity separation capability is great, and an obtained product is high in purity and good in quality.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method and a device for refining methanol by using a dividing wall rectification tower combined with a heat pump. Background technique [0002] Methanol is an important organic chemical raw material, industrial solvent and new energy fuel, and has a wide range of applications in the fields of chemical industry, light industry and clean energy. In the field of chemical industry, there are two types of requirements for the rectification and purification of crude methanol containing impurities to obtain high-purity refined methanol: one is that in the industrial production of synthetic methanol, the crude methanol produced from syngas contains various Light component impurities and heavy component impurities, the refining process to remove these impurities is an important process that determines the quality of methanol products; secondly, in the chemical synthesis and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/80B01D3/14
CPCB01D3/141C07C29/80C07C31/04
Inventor 吴嘉林龙勇鲍艳胡晓萍
Owner HANGZHOU ZJU HOLLEY TECH
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