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Continuous production method of 2-methyl tetrahydrofuran

A technology of methyl tetrahydrofuran and production methods, applied in the direction of organic chemistry, can solve the problems affecting the industrialization of process technology, the cost of catalyst toxicity, and the small amount of raw material treatment, so as to reduce the use and danger of toxic catalysts and high-cost precious metals. The effect of small, large amount of raw material processing

Active Publication Date: 2013-07-24
ASYMCHEM LAB TIANJIN +4
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are also a small number of published documents that disclose the continuous gas phase reaction process from 2-MeF to 2-MeTHF, these continuous gas phase reactions either have a very small amount of raw material treatment, or the catalyst used is a noble metal with high cost. These all seriously affect the industrial scale-up of process technology
[0005] Therefore, how to solve the technical problems of excessive pressure, small processing capacity, catalyst toxicity and high cost 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-methyl tetrahydrofuran
  • Continuous production method of 2-methyl tetrahydrofuran

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Reaction equipment: continuous hydrogenation system composed of gasification chamber, hydrogenation fixed bed reactor (DN25 white steel pipe, length 50cm), and condenser.

[0035] reaction process:

[0036] (1) The hydrogenation fixed-bed reactor is packed by wet method. First fill about 150 g (wet weight 240 g) of Raney Ni catalyst (product number RTH-2123E, from Datong General Chemical Co., Ltd.), and the height of the catalyst bed after filling is about 15 cm. Temperature measuring points are respectively set on the upper part and the lower part of the catalyst bed of the hydrogenation fixed bed reactor.

[0037] (2) Flow nitrogen through the hydrogenation fixed-bed reactor from top to bottom, and at the same time adjust the temperature of the hydrogenation fixed-bed reactor to 130 ° C, and use the nitrogen / hydrogen mixture to activate and dry the Raney Ni catalyst by conventional technical means Treat and remove air from the reaction system. In the mixed gas, the...

Embodiment 2～4

[0039] The operating steps of Example 1 are basically the same, except that the reaction pressure, catalyst type, flow rate of 2-methylfuran, hot spot temperature of the catalyst bed in the hydrogenation fixed-bed reactor, hydrogen and 2-methylfuran flow rate The molar ratio etc., can refer to Table 1 specifically.

[0040] Table 1

[0041]

[0042] Note: The hydrogen-to-oil ratio is the molar ratio of hydrogen flow to vaporized 2-methylfuran flow. Both the supported nickel catalyst HT-40 and the supported nickel catalyst OS-1 were from Liaoning Haitai Technology Development Co., Ltd. The 5% Pd / C (supported palladium on carbon) catalyst was from Johnson Matthey Company.

[0043] As can be seen from the data of Examples 1 to 4, the present invention has realized the method for continuously producing 2-MeTHF by gas phase reaction under low pressure or ambient pressure (0~1.0MPa) by 2-methylfuran, has changed the traditional The production of 2-MeTHF requires high-pressure,...

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Abstract

The invention discloses a continuous production method of 2-mehtyl tetrahydrofuran. The continuous production method comprises the following steps of: pumping 2-methyl furan to a gasifying chamber for gasifying; mixing the gasified 2-methyl furan with hydrogen gas to obtain a gas mixture; inputting the gas mixture to a hydrogenation fixed-bed reactor for carrying out a catalytic hydrogenation reaction; and inputting the gas output by the hydrogenation fixed-bed reactor to a condensing device for condensing to obtain 2-methyl tetrahydrofuran, wherein the pressure of the gasifying chamber and the hydrogenation fixed-bed reactor is 0-1.0MPa, and catalyst for aromatic saturation hydrogenation is filled in the hydrogenation fixed-bed reactor. The continuous production method of the 2-methyl tetrahydrofuran can be used for changing the high-pressure high-investment and high-risk process for conventionally producing 2-MeTHF and can be used for reducing the use of toxic and noble metal catalyst. Besides, the continuous production method has the advantages of being low in investment, small in risk, large in material throughput within unit time, and high in yield and purity, and is suitable for industrial production.

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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IPC IPC(8): C07D307/06
Inventor 洪浩詹姆斯·盖吉马建国张欣陶健
Owner ASYMCHEM LAB TIANJIN
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