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Tetrahydrofuran preparation system and use method thereof

A technology of tetrahydrofuran and dehydration tower, which is applied in the chemical industry, can solve the problems of low THF purity, limited spandex application range, poor spandex quality, etc., and achieve the effect of reducing impurity content, facilitating subsequent processing, and less impurity content

Pending Publication Date: 2021-08-17
张雅坚
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the prior art, the document number "CN202011409915.X" discloses "a system and method for preparing tetrahydrofuran", which can extract THF from BDO tar, but due to the low purity of THF prepared in the prior art, In the subsequent use process (THF is mainly used as a raw material for synthetic spandex), the quality of the spandex prepared by using THF will be poor, and, due to the low purity of THF, it contains too many impurities, resulting in a darker color. Subsequent production The spandex color is darker, which limits the application range of the prepared spandex

Method used

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  • Tetrahydrofuran preparation system and use method thereof

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Embodiment 1

[0041] Please refer to figure 1 , figure 1 Shown is a schematic diagram of the system structure of the embodiment of the present invention.

[0042] The present invention provides a system for preparing tetrahydrofuran, comprising a BDO treatment device and a THF treatment device connected with the BDO treatment device; the THF treatment device includes a BDO reactor 7 connected with the BDO treatment device, and a THF dehydration device connected with the BDO reactor 7 Tower 8, THF pressure tower 9 connected with THF dehydration tower 8, THF decolorization tower 10 connected with THF pressure tower 9 and producing tetrahydrofuran product from the middle, and PTMEG reactor 11 connected with THF dehydration tower 10.

[0043] In this embodiment, the BDO treatment device can dehydrate and purify the tar oil, so that the obtained BDO has a higher purity, and in the subsequent preparation of THF, THF with higher purity and better quality can be obtained; The THF obtained by degr...

Embodiment 2

[0046] Please refer to figure 1 , figure 1 Shown is a schematic diagram of the system structure of the embodiment of the present invention.

[0047] The present invention provides a system for preparing tetrahydrofuran, which differs from Example 1 in that: the BDO treatment device includes a BDO dehydration tower 1, a BDO tar tank 2 connected to the top and bottom of the BDO dehydration tower 1, and a BDO tar tank 2. The BDO evaporator 3, the liquid storage tank 4 connected with the BDO evaporator 3, the BDO vacuum tower 5 connected with the liquid storage tank 4 at the bottom, and the BDO product tank 6 connected with the BDO vacuum tower 5 top and the BDO reactor 7 respectively , wherein, the middle part of the BDO vacuum tower 5 is connected with the BDO tar tank 14.

[0048] In this embodiment, the BDO dehydration tower 1 can dehydrate the recovered BDO tar, reduce the water content in the BDO tar, and facilitate subsequent processing. Its top and bottom are respectivel...

Embodiment 3

[0050] Please refer to figure 1 , figure 1 Shown is a schematic diagram of the system structure of the embodiment of the present invention.

[0051] The present invention provides a system for preparing tetrahydrofuran, which is different from Example 2 in that: the upper end of BDO dehydration tower 1 is connected with a pretreatment device.

[0052] In the present embodiment, the pretreatment device is connected with the BDO dehydration tower 1 pipeline, which collects and processes the recovered BDO tar, and can separate the salt in the BDO tar. On the one hand, the separated salt can be used after washing and decolorization. In industrial salt and deicing agent, it can improve the utilization rate, on the other hand, it can also reduce the impurities in BDO tar, which is convenient for subsequent processing, so that the final product has less impurity content.

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Abstract

The invention provides a tetrahydrofuran preparation system and a use method thereof, and relates to the technical field of chemical engineering. The system comprises a BDO treatment device and a THF treatment device connected with the BDO treatment device, the THF treatment device comprises a BDO reactor connected with the BDO treatment device, a THF dehydrating tower connected with the BDO reactor, a THF pressurizing tower connected with the THF dehydrating tower, a THF decolorizing tower which is connected with the THF pressurizing tower and produces a tetrahydrofuran finished product from the middle part, and a PTMEG reactor connected with the THF dehydrating tower. The system can be used for preparing high-purity tetrahydrofuran.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a system for preparing tetrahydrofuran and a method for using the same. Background technique [0002] The molecular formula of BDO (English full name: Butane-1,4-diol, Chinese name: 1,4-butanediol) is C 4 h 10 o 2 , it is a colorless or light yellow oily liquid, it is an important chemical raw material. During the normal production of BDO, some by-products and waste liquid will be produced, mainly including BDO tar and crude butanol. BDO tar mainly includes BDO, THF (English full name: Tetrahydrofuran, Chinese name: tetrahydrofuran), methanol, butanol and ethanol and other ingredients. [0003] At present, the BDO tar produced in the normal production process of BDO is usually treated by incineration. This method will produce harmful substances, which not only does not meet the environmental protection requirements, but also seriously wastes resources and has low...

Claims

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Application Information

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IPC IPC(8): C07D307/08
CPCC07D307/08
Inventor 张雅坚
Owner 张雅坚
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