Method for separating methyl acetate-methanol mixture by ionic liquid intermittent extractive rectification

A technology of methyl acetate and ionic liquids, which is applied in the field of batch extraction, rectification and separation of ionic liquids, to achieve the effects of flexible operation, increased relative volatility, and low investment in equipment costs

Inactive Publication Date: 2011-09-14
TIANJIN UNIV
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Problems solved by technology

The methyl acetate-methanol system forms an azeotrope when the mass content of methyl acetate is 81%, and it is difficult to obtain relatively pure methyl acetate by conventional distillation methods, so special distillation methods are required, such as separation and pur

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  • Method for separating methyl acetate-methanol mixture by ionic liquid intermittent extractive rectification
  • Method for separating methyl acetate-methanol mixture by ionic liquid intermittent extractive rectification

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Embodiment 1

[0010] A batch extraction and rectification device is used, in which the diameter of the extractive distillation tower is φ25mm, and theta mesh ring packing is installed inside. The height of the packing layer is 1.0m. 531g of methyl acetate-methanol mixture (wherein 81.0% of methyl acetate and 19.0% of methanol, both in mass percent) were put into the heating tank, and the selected extractant for the test was 1-ethyl-3-methylimidazole acetate. Turn on the heat source of the heating kettle and the cold source of the condenser, and the extractive distillation tower starts to operate. When the rising steam in the extractive distillation tower rises to the extraction agent inlet, the extraction agent is added into the extraction distillation tower from the extraction agent inlet, and the extraction agent is controlled. The speed is about 1.5g per minute, total reflux operation, when the temperature at the top of the extractive distillation column is 57.2-58.1°C, the content of met...

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Abstract

The invention discloses a method for separating a methyl acetate-methanol mixture by ionic liquid intermittent extractive rectification, which is realized in a way that: a rectifier of an extractive rectification tower is adopted, an ionic liquid 1-ethyl-3-methyl imidazolyl acetate is used as an extractant, and the operation is carried out intermittently, so the top of the extractive rectification tower sequentially produces a methyl acetate product of which the mass content is up to 98-99.9%, a methyl acetate-methanol transitional fraction and methanol of which the mass content is 97-99%; and finally, the extractant of which the mass percent is 99% is left in the heating kettle. The invention has the following advantages: the extractant is adopted to enhance the relative volatility of the methyl acetate-methanol system, the purity of the separated methyl acetate product is high, and the ionic liquid used as the extractant is easy to recover and does not pollute the environment; and only one single tower needs to be operated, so that operation is flexible and the equipment investment is low.

Description

technical field [0001] The invention relates to an ionic liquid intermittent extraction and rectification separation method of a methyl acetate-methanol mixture, which belongs to the separation technology of the methyl acetate-methanol mixture. Background technique [0002] Extractive distillation is a special rectification method that continuously adds a high-boiling point extractant to the top of the rectification tower to change the relative volatility of the separated components in the feed liquid, so that the liquid mixture that is difficult to separate by ordinary rectification becomes easy to separate. . The methyl acetate-methanol system forms an azeotrope when the mass content of methyl acetate is 81%, and it is difficult to obtain relatively pure methyl acetate by conventional distillation methods, so special distillation methods are required, such as separation and purification by extractive distillation methyl acetate. As an extractant, ionic liquid has the adv...

Claims

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Application Information

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IPC IPC(8): C07C69/14C07C67/54B01D3/40
Inventor 崔现宝蔡贾林李瑞张缨
Owner TIANJIN UNIV
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