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Method for extracting, rectifying and separating methanol-methylal from ionic liquid

An ionic liquid, extractive distillation technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of high energy consumption and large consumption, and achieve the effect of good separation effect

Active Publication Date: 2018-09-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The key technology of extractive distillation is the selection of extractant. Traditional organic solvents consume a lot of energy and consume a lot of energy.

Method used

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  • Method for extracting, rectifying and separating methanol-methylal from ionic liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 The extractive distillation process shown. The extractive distillation column B1 has 20 theoretical plates (the number of plates is counted from top to bottom), [EMIM] [BF 4 ] The extractant S1 is added from the 2nd plate, and the flow rate is 50kg / h, and the mixture of methylal of methanol (90wt% methylal+10wt% methyl alcohol) F1 is added from the 11th theoretical plate, and the flow rate is 100kg / h. The extractive distillation column B1 operates under normal pressure, the top reflux ratio is 0.5, and the output at the top of the column is 90kg / h. As a result, the mass fraction is greater than 99.99% of the methylal product at the top of the column. The temperature at the top of the extractive distillation column is It was 41.58°C, and the temperature in the bottom of the column was 86.37°C.

[0018] The mixture of methanol and ionic liquid in the bottom product of extractive distillation column B1 enters the solvent recovery flash tank B2, the flash...

Embodiment 2

[0020] Such as figure 1 The extractive distillation process shown. The extractive distillation column B1 has 20 theoretical plates (the number of plates is counted from top to bottom), [EMIM] [BF 4 ] The extraction agent S1 is added from the 2nd plate, and the flow rate is 50kg / h, and the mixture of methylal of methanol (70wt% methylal+30wt% methanol) F1 is added from the 9th theoretical plate, and the flow rate is 100kg / h. The extractive distillation column B1 operates under normal pressure, the top reflux ratio is 3, and the output at the top of the column is 70kg / h. As a result, the mass fraction of the methylal product at the top of the column is greater than 99.99%. The temperature at the top of the extractive distillation column is It was 41.58°C, and the temperature in the bottom of the column was 72.65°C.

[0021] The mixture of methanol and ionic liquid in the bottom product of extractive distillation column B1 enters the solvent recovery flash tank B2, the flash te...

Embodiment 3

[0023] Such as figure 1 The extractive distillation process shown. The extractive distillation column B1 has 20 theoretical plates (the number of plates is counted from top to bottom), [EMIM] [BF 4 ] The extraction agent S1 is added from the 2nd plate, and the flow rate is 50kg / h, and the mixture of methylal of methanol (50wt% methylal+50wt% methanol) F1 is added from the 8th theoretical plate, and the flow rate is 100kg / h. The extractive distillation column B1 operates under normal pressure, the top reflux ratio is 3, and the output at the top of the column is 50kg / h. As a result, the mass fraction of the methylal product at the top of the column is greater than 99.9%. The temperature at the top of the extractive distillation column is It was 41.59°C, and the temperature in the bottom of the column was 69.23°C.

[0024] The mixture of methanol and ionic liquid in the bottom product of extractive distillation column B1 enters the solvent recovery flash tank B2, the flash tem...

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Abstract

The invention provides a method for extracting, rectifying and separating methanol-methylal from ionic liquid and belongs to the technical field of separation of methanol and methylal. According to the method provided by the invention, 1-ethyl-3-methylimidazole tetrafluoroborate ([EMIM][BF4]) ionic liquid is mixed as an extracting agent; an extracting and rectifying tower is operated under a normal-pressure condition, and a solvent recycling tank is subjected to decompression operation; the mass / flow ratio of the extracting agent to raw materials is 0.2 to 1.0 and the refluxing ratio is 0.2 to5.0; a methylal product with the mass percent of 99.9 percent can be obtained at a tower top. Discharged materials of a tower kettle of the extracting and rectifying tower enter the solvent recyclingtank; the operation pressure of the solvent recycling tank is a decompression condition of 0.01 to 0.8atm and the operation temperature is 50 to 180 DEG C; an ionic liquid extracting agent obtained by a flash tank is recycled and can be cyclically utilized. According to the method provided by the invention, the extracting, rectifying and separating effect of a methanol and methylal mixture is remarkably improved.

Description

technical field [0001] The invention relates to a method for separating methanol and methylal by extraction and rectification. The extractant is an ionic liquid, which belongs to the technical field of rectification and separation, and belongs to the technical field of separation of methanol and methylal. Background technique [0002] Methylal (DMM) is an important chemical raw material, which can be used as a diesel additive, an intermediate in organic synthesis and as a solvent. Methylal can also replace Freon and reduce the emission of harmful volatile organic compounds. It is an energy Environmentally friendly products that reduce air pollution are widely used. The preparation of methylal is mainly obtained through the reversible chemical reaction of acetal of methanol and formaldehyde, and a mixture of methylal, methanol and water is obtained after the reaction. However, since methylal and methanol form an azeotropic temperature of 41.82° C. under normal pressure, the ...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/84C07C43/30C07C41/58
CPCC07C29/84C07C41/58C07C31/04C07C43/30
Inventor 雷志刚董一春代成娜
Owner BEIJING UNIV OF CHEM TECH
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