Novel application of polytetrafluoroethylene material

Abstract

The invention relates to novel application of polytetrafluoroethylene. The invention relates to the application of polytetrafluoroethylene material as manufacturing lining in high-purity arsenic production equipment. Through a large amount of experimental study, the applicant uses polytetrafluoroethylene with the purity of over 99.99 percent and the thickness between 0.2 and 10 millimeters as lining, can effectively overcome huge disadvantages existing in the field, and achieves success in using the lining for the industrialized production of high-purity arsenic. The invention has the following advantages that: 1, the polytetrafluoroethylene lining with the purity of over 99.99 percent and the thickness between 0.2 and 10 millimeters can be used for long-term uninterrupted arsenic trichloride-resistant corrosion at a high temperature of 150 DEG C with no cracking or leakage; 2, the polytetrafluoroethylene cannot be carbonized and is extremely limited in pollution to high-purity arsenic products; 3, product quality can absolutely be guaranteed; and 4, large-volume reactors can be manufactured to realize the industrialized production of high-purity arsenic by the method. Experiment proves that the purity of high-purity arsenic products produced by use of the lining of the invention can reach 7N (namely 99.99999 percent).

Description

technical field [0001] The present invention relates to a new application of polytetrafluoroethylene. Background technique [0002] Chinese patent application No. 200610088149.5 discloses a "production method and equipment for high-purity arsenic", which mainly adopts one vacuum sublimation and two hydrogen atmosphere sublimation to obtain arsenic with a purity of 99.99999%. The equipment of the present invention is composed of a vacuum sublimator and a hydrogen atmosphere sublimator according to the high-purity arsenic processing steps, wherein the vacuum sublimator includes a heater A, a heater B, a vacuum tank, a water jacket, a crucible, a barrier plate, and a cone. Shaped titanium condenser, low boiling collecting plate, vacuum pump, hydrogen atmosphere sublimator including hydrogen input device, argon input device, casing, quartz tube A, quartz tube B, quartz tube C, heater, scrubber, spray device. The production method of the invention and the matching vacuum sublim...

AI Technical Summary

Problems solved by technology

[0003] The most important reason why high-purity arsenic is difficult to achieve industrialization is that the arsenic trichloride in its rectification process is extremely corrosive. Years of production experience have proved that arsenic trichloride is more corrosive than aqua regia sharp

Previously, there was no metal in the world that could withstand the corrosion of arsenic trichloride. For example, the best steel—the "Hastelloy" alloy steel used for rockets, spaceships, and satellites—was also useless. The only thing that could withstand strong corrosion was quartz. The diameter of the kettle made of quartz is only Φ300, and its mechanical properties are very poor. It is fragile and afraid of external forces, so the production equipment is not large, so it cannot be industrialized. This is the problem that restricts the production of high-purity arsenic.