Method for processing waste catalyst in production of pentafluoro ethane

A waste catalyst, pentafluoroethane technology, applied in chemical instruments and methods, catalyst regeneration/reactivation, physical/chemical process catalysts, etc. Excellent quality, good recovery of catalysts, and the effect of reducing environmental pollution

Inactive Publication Date: 2007-05-16
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current treatment method is generally incineration in an incinerator. This method pollutes the environment and treats a large amount of three wastes, and consumes a lot of energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, the method for preparing pentafluoroethane by using tetrafluoroethylene and anhydrous hydrogen fluoride disclosed in CN200410035429.0 is used as an example to treat the 2kg waste catalyst replaced in the production of pentafluoroethane (HFC-125). The method is:

[0021] A. Select liquid caustic soda 48% NaOH for use;

[0022] B. Stirring: add 2kg of spent catalyst to the 3-liter reaction kettle, add 1000-2000ml of pure water to dilute it, turn on stirring, and stir evenly for 6 minutes;

[0023] C, reaction: add prepared liquid caustic soda 48%NaOH in the reactor according to the equivalent ratio of chemical reaction, make it fully react 1~2 hour, reaction formula is as follows:

[0024] HNFR 3 +NaOH=NR 3 +NaF+H 2 O

[0025] D. Fractionation and purification: put the materials in the reaction kettle into a fractionation tower for fractionation, control the temperature of the tower kettle well, and use the different boiling points of each materia...

Embodiment 2

[0027] In this embodiment, CN200410035429.0 discloses a method for preparing pentafluoroethane by using tetrafluoroethylene and anhydrous hydrogen fluoride, and the treatment of 1 kg of waste catalyst replaced in the production of pentafluoroethane (HFC-125) is taken as an example , the processing method is:

[0028] A. Select liquid caustic soda 32% KOH for use;

[0029] B, stirring: add a certain amount of spent catalyst 2kg to the 3-liter reaction kettle, add 400-500ml of pure water to dilute it, turn on stirring, and stir evenly for 8 minutes;

[0030] C, reaction: add prepared liquid caustic soda KOH in the reactor according to the equivalent of chemical reaction, make it fully react 1.5 hours, reaction formula is as follows:

[0031] HNFR 3 +KOH=NR 3 +KF+H 2 O

[0032] D. Fractionation and purification: put the materials in the reaction kettle into the fractionation tower for fractionation, control the temperature of the tower kettle, and separate the materials by t...

Embodiment 3

[0034] In this embodiment, CN200410035429.0 discloses a method for preparing pentafluoroethane by using tetrafluoroethylene and anhydrous hydrogen fluoride, and the treatment of 1.5 kg of waste catalyst replaced from the production of pentafluoroethane (HFC-125) is taken as an example , the processing method is:

[0035] A. Select liquid caustic soda 28% NH 3 ·H 2 O Standby;

[0036] B, stirring: add a certain amount of spent catalyst 2kg to the 3-liter reaction kettle, then add 800-1000ml of pure water to dilute, turn on stirring, and stir evenly for about 5 minutes;

[0037] C, reaction: add the prepared liquid caustic soda in the reactor according to the equivalent of chemical reaction, make it fully react for 2 hours, and the reaction formula is as follows:

[0038] HNFR 3 +NH 3 ·H 2 O=NR 3 +NH 4 F+H 2 O

[0039] D. Fractional distillation and purification: put the materials in the reaction kettle into the rectification tower for fractionation, control the temper...

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PUM

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Abstract

The invention relates to a method for treating the waste catalyst in hydrofluoeic ether production, wherein it comprises: mixing catalyst, reacting with alkali, and distilling in distilling tower. The invention has low energy consumption and high quality, with low cost.

Description

technical field [0001] The invention relates to a method for treating waste catalysts in the production of pentafluoroethane, and belongs to the technical field of chemical three-waste treatment. Background technique [0002] In the production process of preparing pentafluoroethane (HFC-125) by using tetrafluoroethylene and anhydrous hydrogen fluoride, a catalyst needs to be used for catalytic reaction. CN200410035429.0 discloses a method for preparing pentafluoroethane by using tetrafluoroethylene and anhydrous hydrogen fluoride. In the method, the catalyst used is a binary system consisting of a tertiary amine compound and a carbonyl-containing compound. Tertiary amine compounds can be one kind or a mixture of several kinds. Such as: triethylamine, tri-n-propylamine, NN-dimethylaniline, tri-n-butylamine, isopropyldiethylamine, tripropylamine, triphenylamine, etc. The carbonyl-containing compound may be one carbonyl compound or a mixture of several carbonyl compounds. Su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/48C07C209/82C07C45/78C07C19/08
CPCY02P20/584
Inventor 宋学章孙百开赵永晓
Owner SHANDONG DONGYUE POLYMER MATERIAL
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