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Method for removing methanol in ethanol

A technology of methanol and ethanol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as insignificant effect of azeotropic distillation, loss of liquor flavor, difficult operation, etc., to achieve a wide range of applications, Low cost, good safety effect

Active Publication Date: 2020-03-24
SIHUI DABOWEN IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in order to reduce the content of methanol, there must be a rectification tower and auxiliary equipment with a reasonable structure, and at the same time, the process operation must be stable. To achieve methanol-free ethanol, the operation is difficult and costly
For the treatment of potato finished wine with higher methanol content, use potassium permanganate-nitrate-sodium hydroxide, etc. Not obvious, and it is easy to lose the flavor of liquor, so it is not suitable to use
At present, natural zeolite or artificial molecular sieve that can adsorb methanol is used for treatment. Due to the difference in molecular size and polarity, it shows selective adsorption for methanol, so it is necessary to select a specific molecular sieve, which greatly limits its use.

Method used

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  • Method for removing methanol in ethanol
  • Method for removing methanol in ethanol
  • Method for removing methanol in ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Melting to prepare CaMg 2 alloy, the steps are as follows:

[0036] Under the atmosphere of 0.1MPa argon gas, the magnesium block with a purity of more than 99% and the calcium block with a purity of 95% are packed into a well-sealed pure iron tube with a material ratio of 2:1, and placed in a resistance furnace And kept at 900°C for 20h, cooled with the furnace, and then the obtained Mg-Ca alloy was crushed in an argon atmosphere glove box and passed through a 200-mesh sieve. The XRD pattern was similar to that of CaMg 2 PDF comparisons like figure 1 shown by figure 1 It can be seen that the obtained broken Mg-Ca alloy is high-purity CaMg 2 alloy powder.

Embodiment 2

[0038] Preparation of refined CaMg by ball milling 2 Alloy powder, the steps are as follows:

[0039] Under room temperature, in the glove box of 0.1MPa argon gas atmosphere, get the 200 order CaMg that above-mentioned embodiment 1 prepares 2 The alloy powder was put into a ball mill jar and sealed, and then placed (volume about 200ml) in a planetary ball mill (QM-3SP4) for ball milling, the ball-to-material ratio was 30:1, the ball milling speed was 400 rpm, and the ball milling time was 0.5-3h, the operation mode is alternating positive and negative intermittent operation, each time running for 30 minutes and then stopping for 30 minutes, so alternately.

[0040] CaMg after ball milling 2 The XRD pattern of the alloy powder is as follows figure 2 As shown, comparing the diffraction peaks of raw materials, it can be seen that the powder obtained by ball milling at different times is still CaMg 2 , but the diffraction peaks become wider and weaker, which means that the gr...

Embodiment 3

[0042] CaMg 2 The alcoholysis reaction of alloy powder in alcohol solution, the steps are as follows:

[0043] At room temperature, in a glove box with 0.1MPa argon atmosphere, take 0.1g of 200 mesh sieved CaMg 2 The alloy powder is placed in a reaction bottle, and alcoholysis reaction is carried out with 10ml methanol at room temperature, and the reaction kinetic curve is as follows: image 3 As shown in the curve (a) in the reaction, there is an induction period of about 2 minutes at the beginning of the reaction, and then the alcoholysis reaction rate is accelerated, reaching the maximum at 3 minutes, and the hydrogen production rate is 702ml g -1 min -1 Hydrogen, the CaMg 2 The alloy powder can be completely reacted within 5 minutes, and the final hydrogen release amount is 864ml·g -1 hydrogen.

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Abstract

The invention discloses a method for removing methanol in ethanol. The method comprises the following steps that: a, CaMg2 alloy powder is prepared; and b, methanol in ethanol is removed; i.e., the CaMg2 alloy powder is added into an ethanol solution doped with methanol, and the alloy can selectively undergo an alcoholysis reaction with methanol, so the purpose of removing methanol impurities in the ethanol solution is achieved. Byproducts including magnesium methoxide (Mg(CH3O)2) and calcium methoxide (Ca(CH3O)2) obtained after alcoholysis can be further recycled for resynthesis of the CaMg2alloy. According to the invention, selected and used raw materials are rich in source, low in cost, easy to prepare, and capable of achieving cyclic utilization of metal resources and the like; and the method has the characteristics of simple process, mild reaction conditions, wide application range, no pollution, good safety and the like, and is of important practical significance for removing methanol with a standard-exceeding content in ethanol to obtain high-quality methanol-free ethanol.

Description

technical field [0001] The invention belongs to the technical field of alloy materials and ethanol purification, and in particular relates to a method for removing methanol in ethanol. Background technique [0002] Methanol (commonly known as wood alcohol, xylin, its molecular formula is CH 3 OH) is an industrial raw material that is cheaper than alcohol, has an alcohol smell, and is difficult to distinguish from edible alcohol by the senses. It is a colorless and transparent liquid that is more palatable and less irritating than alcohol. In the production of liquor and alcohol (ethanol), the pectin and methylpentose in the raw materials are hydrolyzed to form methoxy (-OCH) under the action of heat, acid, alkali and enzymes during the cooking process. 3 ), the reduction of methoxyl groups will form methanol, and the methanol content in wine often exceeds the national food hygiene standard. Methanol has an inhibitory effect on the central nervous system of the human body, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/88C07C31/08
CPCC07C29/88C07C31/08
Inventor 闵德欧阳柳章陈康朱敏
Owner SIHUI DABOWEN IND CO LTD
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