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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  • Abstract
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  • Claims
  • Application Information

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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 documen

Method used

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  • Method for completely depolymerizing polytetrahydrofuran in anhydrous environment

Examples

Experimental program
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Example Embodiment

[0022] Example 1: An attached figure 1 As shown, the polytetrahydrofuran is carried out in an aqueous environment, and is carried out according to the following method:

[0023] 98% of the concentrated sulfuric acid was added to the polymerization reactor 2, and the polytetrahydrofuran (PTMEG) was preheated by the feed preheater 1 to 145 ° C to 160 ° C, and the preheated polytex hydrofuran was added to the polymerization reactor 2. Under the catalytic action of 98% concentrated sulfuric acid, the polytetrahydrofuran is a solution reaction in a polymerization reactor 2 having a temperature of from 95 ° C to 105 ° C, and the polymerized gas-containing gas-containing gas phase enters the reaction. The column top condenser 4 is cooled, and the obtained tetrahydrofuran is cooled in the alkali liquid to obtain tetrahydrofuran; wherein 98% concentrated sulfuric acid is added to the decollation reactor 2, the amount of concentrated sulfuric acid is not added. Before reaching 0.3 t (tonne)...

Example Embodiment

[0028] Example 2: As an optimization of the above embodiment, the tar concentration in the polymerization reactor 2 is reduced to 5% or less before the polymerization reactor 2 is added to the decallitor 2.

Example Embodiment

[0029] Example 3: Reactor Tower Top Condenser 4 Condensation The liquid phase tetrahydrofuran is a product, and the gas phase group that cannot be condensed is divided into emptying the condenser 6 again.

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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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