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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AI-Extracted Technical Summary

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...
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Method used

Publication number is 107556270 Chinese patent application documents (name: a kind of PTMEG depolymerization technique, hereinafter referred to as existing technique), it uses steam condensate or desalted water to feed intake to depolymerization reactor 2, this is this patent ...
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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.

Application Domain

Technology Topic

Sulfuric acidTetrahydrofuran +4

Image

  • Method for completely depolymerizing polytetrahydrofuran in anhydrous environment

Examples

  • Experimental program(7)

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), the decapmetric load of the decapceptor reactor 2 was less than 6 T / h, and when the amount of concentrated sulfuric acid was added to 0.3 t, the decapmetric load of the polymerization reactor 2 rose to 6. T / h, when the mass content of 98% concentrated sulfuric acid in the polymerization reactor 2 reached 6% to 8%, the polymerization load of the polymerization reactor 2 was adjusted to a full load of 7.5 T / h;
[0024] During the decomposition process, the liquid level of the decrect reactor 2 is 20% to 30%, and the return flow of the reactor column 3 is 1.7 t / h to 1.9 T / h, and the circulation pump 8 cycle at the outlet of the reactor 2 The amount is ≥120t / h, and the circulating material of the decapulizer 2 is heated by the reboiler 5, the pressure of the reactor column 3 is 10 kPAg (surface pressure), and the tetrahydrofuran temperature after the reactor column top condenser 4 is condensed. It is 25 ° C to 35 ° C.
[0025] The present invention is a process technique for polytegahydrofuran in anhydrous environment, and polytex hydrofuran is more rapidly reacted in anhydrous conditions than a water environment, and the fracture of the molecular chain is easier, and the reaction temperature is more than a water environment. Lower. The polytexhydrofuran depolymerization reaction is not reversible, but a typical heat-absorbing chain reaction, which is polymerized to form tetrahydrofuran and water under concentrated sulfate catalysis.
[0026] The method of the present invention is designed to produce BDO (1,4-buta alcohol) to produce THF (tetrahydrofuran), such as an Invista technology. figure 1 Indicated.
[0027] Publication No. 10,7556270 (Name: A PTMEG Polymerization Process, Under Existing Process), using steam cold condensate or dehydrated water to process the polymerization reactor 2, this is not allowed by this patent application Operation, existing processes require discharge tar during the decomposition process, and the method of the present invention does not need to discharge tar and can smoothly depolymerize during the decomposition process.

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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PUM

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Description & Claims & Application Information

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