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Hexafluoropropylene production method

A technology for the production of hexafluoropropylene, applied in chemical instruments and methods, preparation of halogenated hydrocarbons, organic chemistry, etc., can solve problems such as self-polymerization of tetrafluoroethylene, hindering the increase of yield, and overheating at the outlet end. Fewer by-products, improved heat transfer, and accurate adjustment of reaction temperature

Inactive Publication Date: 2003-11-12
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are still disadvantages such as tetrafluoroethylene is easy to self-polymerize at the inlet end, causing overheating phenomenon at the outlet end, carbonization and generation of a large number of by-products, hindering the improvement of yield, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] In this embodiment, the tubular reactor is heated in three stages, and the mixed gas contains 73.67% tetrafluoroethylene (TFE) and 26.33% octafluorocyclobutane (C-318) (including 6.1% perfluorobutene). The tubular reactor is a φ32×3mm stainless steel tube with a length of 13.0m. Each section adopts indirect heating. Three temperature monitoring points. Its production method is:

[0014] A. First put TFE at 25.0Nm 3 / h, C-318 at 7.1Nm 3 The flow rate of / h is input into the mixer and mixed evenly under the pressure of 15KPa;

[0015] B. Input the above-mentioned homogeneously mixed cracked gas into the tubular preheater, preheat it to 450°C and directly input it into the tubular reactor;

[0016] C. The input of the preheated mixed cracked gas, the heating temperature of the first section is 851°C (the temperature of the outer tube wall of the reactor, the same below), the second section is 660°C, and the temperatures of the three temperature monitoring points in the...

Embodiment 2

[0021] TFE70.92% in the mixed gas of this example, C-318 is 29.08% (which contains perfluorobutene 12.0%); the tubular reactor is directly heated in 6 sections, and the length of each heating section 1-5 is 3.0m , each set up a temperature monitoring point, the sixth section is 11.5m long, with 3 temperature monitoring points. The present embodiment method is:

[0022] A. TFE at 25.1Nm 3 / h, C-318 at 7.6Nm 3 The flow rate of / h is input into the mixer and mixed evenly under the pressure of 11.0KPa;

[0023] B. Input the above-mentioned mixed gas into the tubular preheater to preheat to 550°C and then directly input it into the tubular reactor;

[0024] C. The preheated mixture is heated at 741°C in the first section, 754°C in the second section, 760°C in the third section, 767°C in the fourth section, 760°C in the fifth section, and 760°C in the sixth section. The pyrolysis reaction was heated under the condition of 776° C., and the reaction residence time was 1.5 seconds....

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Abstract

The production method of hexafluoropropylene includes the following steps: uniformly mixing raw material gas tetrafluoroethylene and octafluorocyclobutane according to a certain proportion, preheating and feeding them into stage heated tubular reactor for making cracking reaction, quenching reaction product, removing acid, drying and finally rectifying separation to obtain the invented hexafluoropylene whose purity is greater than or equal to 99.98%. Said invention adopts the octafluorocyclobutane as diluting agent and as reactant, at the same time adopts stage heated cracking process, so that it not only improves the thermal conductivity of cracking gas, but also can make the whole reaction process be implemented in optimum temp. range to inhibite the production of poor side reaction.

Description

technical field [0001] The invention belongs to a method for producing hexafluoropropylene (HFP) in chemical production. In particular, a method for producing hexafluoropropylene by mixed cracking of tetrafluoroethylene (TFE) and octafluorocyclobutane (C-318). Background technique [0002] Hexafluoropropylene (also known as perfluoropropylene) is one of the basic raw materials in the organic fluorine industry, and is widely used in the production of fluororubber, fluoroplastics, perfluoropropylene oxide, heptafluoropropane, and fluorosurfactants. However, the traditional method of using pure tetrafluoroethylene as raw material to produce hexafluoropropylene through high-temperature pyrolysis in a tubular reactor is easy to self-polymerize at the inlet of the pipe and easy to form carbon at the outlet of the pipe, and the reaction time at high temperature If it is long, disproportionation reaction will occur to generate carbon and carbon tetrafluoride, and it will also cause...

Claims

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Application Information

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IPC IPC(8): C07C17/26C07C21/18
Inventor 张在利曾子敏刘忠文吴常根喻崇权贺谭瑞
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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