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A kind of trifluoromethane resource utilization method

A technology of trifluoromethane and resource utilization, applied in the field of fluorine-containing olefins, can solve the problems of complex product components, loss of catalytic activity, melting, etc., and achieve the effect of improving process conditions

Active Publication Date: 2020-09-22
SHANDONG DONGYUE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There are some common problems in the prior art, that is, under the gas phase cracking reaction conditions, if a certain ideal conversion rate is to be achieved, the reaction temperature is high, the by-products are many, the carbon deposition is serious, and the catalyst deactivation is serious, especially under high temperature conditions. Most catalysts will undergo structural collapse or severe changes in crystal forms or even melt, resulting in loss of catalytic activity
Secondly, adding other reactants to co-crack, the product components are complex, which increases the difficulty and cost of reactant separation

Method used

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  • A kind of trifluoromethane resource utilization method
  • A kind of trifluoromethane resource utilization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A resource utilization method of trifluoromethane, the mixture of trifluoromethane and nitrogen with a dilution ratio of 10% is used as a reaction raw material, and the reaction equation is:

[0058] CHF 3 → CF 2 = CF 2 +CF 3 CF=CF 2 +HF

[0059] Charge 180 g of trifluoromethane into a steel cylinder with a volume of 8 L, and then fill with 7 g of nitrogen gas for premixing.

[0060] Place the SUS316 stainless steel preheating device with an inner diameter of 13 mm and a length of 95 cm and the SUS316 reaction device with an inner diameter of 13 mm and a length of 35 cm in the ceramic tube of the heating furnace. The ceramic tube is surrounded by heating elements and is insulated with aluminum silicate insulation cotton. The temperature required for the reaction is controlled by a heating furnace with a temperature controller and a thermocouple.

[0061] Adjust the readings of the temperature controller, first heat the preheating device and the reaction device, wh...

Embodiment 2

[0064] As described in Example 1, the difference is: adjust the real number of the mass flow meter, control the flow rate of the raw material to 1.4L / min, and control the system pressure to 0.4MPa. acid device, then dried, sampled, and gas chromatographically analyzed the content of each component in the mixed product.

[0065] The product mixture after quenching alkali washing to remove acid enters the drying device, and the dried product mixture is passed into the methanol absorption device to remove the highly toxic perfluoroisobutene, and then enters the extraction and rectification separation device to obtain high-purity tetrafluoroethylene. , Hexafluoropropylene. The gas chromatography analysis results are listed in Table 1.

Embodiment 3

[0067] As described in Example 1, the difference is: adjust the reading of the temperature controller, control the reaction temperature of the reaction device to 750°C, adjust the real number of the mass flow meter, control the flow rate of the raw material to 0.5L / min, and control the system pressure to 0.4MPa. The product mixed flow from the reaction device is introduced into a quenching acid removal device filled with lye, then dried and sampled, and the content of each component in the mixed product is analyzed by gas chromatography.

[0068] The product mixture after quenching alkali washing to remove acid enters the drying device, and the dried product mixture is passed into the methanol absorption device to remove the highly toxic perfluoroisobutene, and then enters the extraction and rectification separation device to obtain high-purity tetrafluoroethylene. , Hexafluoropropylene. The gas chromatography analysis results are listed in Table 1.

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Abstract

The invention relates to a resource utilization method of trifluoromethane. The method comprises the steps of diluting trifluoromethane through nitrogen, preheating the trifluoromethane at 350-450 DEG C, standing in a reaction device of 650-950 DEG C for 0.05-10s, and carrying out thermal cracking reaction to obtain a tetrafluoroethylene and hexafluoropropylene mixture; and carrying out after-treatment, such as condensation and deacidification, drying, methanol absorption, extraction, distillation and separation to obtain high-purity and high-added value tetrafluoroethylene and hexafluoropropylene. Low-energy and low-cost resource utilization of the trifluoromethane is achieved, and the environmental harm caused by direct emission of the trifluoromethane is avoided; and a catalyst is not used in the method, so that the problems of catalyst coking deactivation, reactant carbonization and device blockage at high temperature are avoided.

Description

technical field [0001] The invention relates to a method for resource utilization of trifluoromethane, in particular to a method for converting trifluoromethane into fluorine-containing olefins with high added value. [0002] technical background [0003] Trifluoromethane (CHF 3 , HFC-23) is a by-product produced during the catalytic reaction of chloroform and HF to prepare difluorochloromethane (HCFC-22), and its generation amount is about 1.5-3.5wt% of the content of HCFC-22, but due to HCFC -22 itself is the main source for the manufacture of perfluoroolefins such as tetrafluoroethylene (TFE), so difluorochloromethane is excluded from the emission reduction items stipulated in the "Kyoto Protocol". Therefore trifluoromethane (CHF 3 ) emissions will continue for a long time, and the annual CHF 3 As many as tens of thousands of tons. Trifluoromethane is a greenhouse gas (GWP value is about 14800, equivalent to CO 2 14800 times of that), and have a long lifetime in the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/269C07C17/38C07C21/185C07C21/18
CPCC07C17/269C07C17/38C07C21/185C07C21/18
Inventor 韩春华王鑫都荣礼丁晨徐强王伟孙森张星全
Owner SHANDONG DONGYUE CHEM
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