Device and method for recovering trifluoromethanesulfonic acid from trifluoromethanesulfonic acid-containing wastewater

Abstract

The invention relates to a device and a method for recovering trifluoromethanesulfonic acid from trifluoromethanesulfonic acid-containing wastewater, and belongs to the technical field of fine chemical engineering and environmental protection. According to the device, a neutralization reaction kettle is connected with a filter, wherein the filter is connected with a buffer tank, the buffer tank isconnected with a drying device, the drying device is connected with an acidification reaction kettle, the acidification reaction kettle is connected with a condenser, the condenser is connected witha receiving tank, and the receiving tank is provided with a vacuum connector connected with a vacuum pump. By adopting the device and the method provided by the invention, trifluoromethanesulfonic acid can be recovered from trifluoromethanesulfonic acid-containing wastewater under the conditions of lower temperature and pressure. The process is of one-way circulation, wherein no hazardous waste, no pollution and no hazardous gas are generated, and trifluoromethanesulfonic acid-containing wastewater which is difficult to treat at the present stage is treated at the same time; the recovered trifluoromethanesulfonic acid can be reused, so that the method has good market requirements and economic benefits.

Description

technical field [0001] The invention relates to a device and method for recovering trifluoromethanesulfonic acid from wastewater containing trifluoromethanesulfonic acid, belonging to the technical fields of fine chemical industry and environmental protection. Background technique [0002] Trifluoromethanesulfonic anhydride is a derivative of trifluoromethanesulfonic acid. There are currently three known preparation methods for trifluoromethanesulfonic anhydride: the reaction method of trifluoromethanesulfonic acid and phosphorus chloride, the mixed anhydride method, and the trifluoromethanesulfonic anhydride method. Acid and phosphorus pentoxide reaction method. In the process of preparing trifluoromethanesulfonic anhydride by the reaction method of trifluoromethanesulfonic acid and phosphorus pentoxide, there will be a reaction raffinate mixture that needs to be discharged. The main components of the discharged raffinate are: pyrophosphoric acid, trifluoromethanesulfonic a...

AI Technical Summary

Problems solved by technology

In the process of preparing trifluoromethanesulfonic anhydride by the reaction method of trifluoromethanesulfonic acid and phosphorus pentoxide, there will be a reaction raffinate mixture that needs to be discharged. The main components of the discharged raffinate are: pyrophosphoric acid, trifluoromethanesulfonic acid And trace amounts of HF, H 2 SO 4 and other impurities, among which trifluoromethanesulfonic acid has greater economic value, and direct discharge will cause waste of raw materials

In the prior art, there is no report about the process scheme and equipment for reclaiming this part of trifluoromethanesulfonic acid in actual chemical production, so it is urgent to develop a device for reclaiming trifluoromethanesulfonic acid from waste water containing trifluoromethanesulfonic acid and method

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