Method for completely depolymerizing polytetrahydrofuran in anhydrous environment

A polytetrahydrofuran, water-free environment technology, applied in the direction of organic chemistry, can solve the problems of reducing production costs, increasing the risk of polluting the environment, and not being able to achieve full-load depolymerization, so as to achieve the effect of controlling production costs

Pending Publication Date: 2021-06-15
XINJIANG BLUE RIDGE TUNHE ENERGY
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Problems solved by technology

Most of the unqualified products in the past are depolymerized and recycled with low conversion rate or directly incinerated, which not only reduces the production cost of the enterprise but also increases the risk of environmental pollution
[0004] The Chinese patent application document with publication number 107556270 discloses a PTMEG depolymerization process, which uses steam condensate or desalted water to feed the depolymerization reactor, and needs to discharge tar during the depolymerization process. In addition, it cannot achieve full load Depolymerization

Method used

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  • Method for completely depolymerizing polytetrahydrofuran in anhydrous environment

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Experimental program
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Embodiment 1

[0022] Embodiment 1: as attached figure 1 Shown, the method that this polytetrahydrofuran is all depolymerized under anhydrous environment, carries out as follows:

[0023] Add 98% concentrated sulfuric acid into the depolymerization reactor 2, preheat the polytetrahydrofuran (PTMEG) to 145°C to 160°C through the feed preheater 1, and add the preheated polytetrahydrofuran into the depolymerization reactor 2 , under the catalysis of 98% concentrated sulfuric acid, polytetrahydrofuran undergoes depolymerization reaction in depolymerization reactor 2 at a temperature of 95°C to 105°C, and the gas phase containing tetrahydrofuran generated by depolymerization enters the reaction through the top of reactor tower 3 The tower top condenser 4 is cooled, and the tetrahydrofuran liquid phase that cooling obtains obtains tetrahydrofuran after being neutralized by alkaline solution; Wherein, when adding 98% vitriol oil to depolymerization reactor 2, the add-on of 98% vitriol oil does not ...

Embodiment 2

[0028] Embodiment 2: As an optimization of the above embodiment, before adding 98% concentrated sulfuric acid to the depolymerization reactor 2, it is necessary to reduce the tar concentration in the depolymerization reactor 2 to below 5%.

Embodiment 3

[0029] Example 3: The liquid-phase tetrahydrofuran obtained by condensing the condenser 4 at the top of the reactor is the product, and the gas phase components that cannot be condensed are condensed and recovered by the vent condenser 6 again and then sent to vent.

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Abstract

The invention relates to the technical field of a polytetrahydrofuran depolymerization process, in particular to a method for completely depolymerizing polytetrahydrofuran in an anhydrous environment, which comprises the following steps: adding 98% concentrated sulfuric acid and preheated polytetrahydrofuran into a depolymerization reactor, subjecting the polytetrahydrofuran to a depolymerization reaction in the depolymerization reactor, cooling a tetrahydrofuran-containing gas phase generated by depolymerization, and conducting neutralization by alkali liquor to obtain tetrahydrofuran. The method is a process technology for completely depolymerizing the polytetrahydrofuran in an anhydrous environment, tar is not discharged in the depolymerization process, the PTMEG depolymerization load can be controlled at 100%, in addition, existing production equipment for producing the tetrahydrofuran from 1,4-butanediol is continuously used, the production of the tetrahydrofuran and the depolymerization of the polytetrahydrofuran can be alternately carried out, and the production cost is effectively controlled.

Description

technical field [0001] The invention relates to the technical field of polytetrahydrofuran depolymerization technology, and relates to a method for completely depolymerizing polytetrahydrofuran in an anhydrous environment. Background technique [0002] Polytetrahydrofuran, also known as polytetramethylene ether glycol, tetrahydrofuran homopolyether, etc., is referred to as PTMEG. It is obtained by ring-opening polymerization of tetrahydrofuran under the action of a catalyst, and many patent application documents have provided its preparation method. Polytetrahydrofuran is a white waxy solid at room temperature. It is mainly used in the production of spandex, polyurethane elastomer, TPEE, coatings, etc., and is widely used. At present, the main domestic production technologies are INVISTA technology of the United States, BASF technology of Germany and PTG technology of South Korea, and the production enterprises are all over the country. [0003] As the production capacity ...

Claims

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Application Information

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IPC IPC(8): C07D307/08
CPCC07D307/08
Inventor 刘昌明陈建业张玉楠
Owner XINJIANG BLUE RIDGE TUNHE ENERGY
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