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Continuous production method of 2-MeTHF (2-methyltetrahydrofuran)

A technology of methyltetrahydrofuran and production method, applied in the direction of organic chemistry and the like, can solve the problems affecting the industrialization of process technology, high risk, high cost, and reduce the use of highly toxic and high-cost catalysts, low risk, and impurities. easy effect

Active Publication Date: 2013-01-16
ASYMCHEM LAB TIANJIN +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, except that the conversion rate of furfural is low, there are also the following disadvantages: 1) the reaction pressure of producing 2-MeTHF by liquid-phase high-pressure reaction is high, the risk is large, and the separation of intermediate products is required, resulting in high investment; 2) Technologies using continuous gas phase reactions with very small feedstocks or catalysts containing highly toxic chromium
The above-mentioned problems lead to high cost and seriously affect the industrial scale-up of process technology
Therefore, how to solve the technical problems of unsustainable production such as excessive pressure, high catalyst toxicity and high cost, and separation and purification of intermediate products that exist in the current production of 2-MeTHF has become a hot spot of current research.

Method used

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  • Continuous production method of 2-MeTHF (2-methyltetrahydrofuran)

Examples

Experimental program
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Embodiment approach

[0022] According to a typical implementation of the present invention, the continuous production method of 2-methyltetrahydrofuran comprises the following steps: input gasified furfural and hydrogen into the first reaction zone, and a catalytic hydrogenation reaction occurs; The gas is input into the second reaction zone for secondary catalytic hydrogenation reaction; and the gas output from the second reaction zone is condensed to obtain 2-methyltetrahydrofuran; wherein, the first reaction zone is filled with a catalyst for aldehyde group reduction , the second reaction zone is packed with a catalyst for aromatic saturation hydrogenation.

[0023] The present invention adopts a low-toxic, cheap and easy-to-obtain catalyst to produce high-purity 2-MeTHF from furfural through gas-phase continuous reaction under low pressure or ambient pressure, which changes the traditional production of 2-MeTHF that requires high pressure, high investment and Highly hazardous process, reducing...

Embodiment 1

[0046] Reaction equipment: gasification chamber, first hydrogenation fixed bed reactor (DN25 white steel pipe, length 50cm), heat exchanger, second hydrogenation fixed bed reactor (DN25 white steel pipe, length 50cm), condenser.

[0047] reaction process:

[0048] (1) 100 g of copper-based catalyst (commodity number TG-45, from Shanghai Xunkai) was filled in the first hydrogenation fixed-bed reactor, and the height of the catalyst bed after filling was 15 cm. Temperature measuring points are respectively set on the upper part and the lower part of the catalyst bed of the first fixed bed reactor. In the second fixed-bed reactor, about 150 g (wet weight 240 g) of Raney Ni catalyst (product number RTH-2123E, from Dalian Tonghua) was packed by wet packing, and the catalyst bed was about 15 cm high after packing. Temperature measuring points are respectively set on the upper part and the lower part of the catalyst bed of the second fixed bed reactor.

[0049] (2) The gas flows th...

Embodiment 2-3

[0052] The operation steps are basically the same as in Example 1, except for the catalyst type, reaction temperature and flow rate, etc., see Table 1 for details.

[0053] Wherein the reaction process of embodiment 1-3 is all under low pressure or environment pressure condition, and concrete condition and result are shown in Table 1.

[0054] Table 1

[0055]

[0056] Note: The hydrogen-to-oil ratio is the molar ratio of hydrogen flow to gasified furfural flow.

[0057]As can be seen from the data of Examples 1-3, the catalyst of the present invention has been adopted to realize the continuous production of 2-MeTHF by furfural under low pressure or ambient pressure by gas-phase reaction, which has changed the traditional production of 2-MeTHF that requires high pressure, high The high-input and high-risk process improves upon the use of highly toxic or high-cost catalysts in the prior art due to the use of low-toxicity and cheap and readily available catalysts. In additi...

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Abstract

The invention discloses a continuous production method of 2-MeTHF (2-methyltetrahydrofuran), which comprises the following steps of: inputting gasified furfural and hydrogen into a first reaction area and conducting primary catalytic hydrogenation reaction; inputting gas output by the first reaction area into a second reaction area and conducting secondary catalytic hydrogenation reaction; and condensing gas output by the second reaction area to obtain the 2-MeTHF, wherein the first reaction area is filled with catalyst for reducing aldehyde groups and the second reaction area is filled with catalyst for aromatic saturated hydrogenation. By using low-toxicity, low-cost and easy-to-obtain catalyst to produce high-purity 2-MeTHF through gas-phase continuous reaction under low pressure or low ambient temperature, the traditional technology which has the disadvantages of high pressure, great investment and great risk is changed, and the use of high-toxicity precious metals can be reduced. The production technology is simple, the investment is small, the risk is small, the furfural treatment capacity per unit time is large, the yield is high, the purity of the obtained crude product is high and the impurities are easy to separate.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a continuous production method of 2-methyltetrahydrofuran. Background technique [0002] 2-Methyltetrahydrofuran (2-MeTHF) is an important organic intermediate and an excellent solvent. Because of its moderate boiling point (80.2°C), it has low solubility in water and is easy to separate from water. ) is similar to Lewis basicity, so it can be applied to many organometallic reactions, and is currently being widely used in industrial production as a new type of solvent. Because 2-MeTHF can be miscible with gasoline in any proportion and has excellent properties such as oxidation and vapor pressure, it can also be used as an automotive fuel additive to replace part of gasoline. Studies have shown that when the proportion of 2-MeTHF in gasoline exceeds 60%, it will not have any impact on the performance of the engine, and the fuel consumption of the car will not increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/06
Inventor 洪浩黄平忠卢江平张欣郭效文孙兴芳陶建
Owner ASYMCHEM LAB TIANJIN
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