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Novel application of polytetrafluoroethylene material

A polytetrafluoroethylene and lining technology, which is applied in the direction of improving process efficiency, can solve the problems of severe corrosion, strong corrosion of arsenic trichloride, fear of external forces, etc.

Inactive Publication Date: 2010-07-28
昆明鸿世达高技术材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Experimental program
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Effect test

Embodiment 1

[0013] The heating kettle made of polytetrafluoroethylene with a purity of 99.99% and a thickness of 2-6 mm is lined on the stainless steel shell. The continuous working time at 150 ° C: 3500 hours; Tested by Shanghai Silicate Testing Center of Academy of Sciences, the total amount of impurities is 0.493ppm (1ppm = one millionth of a gram), and the quality grade is 6N (ie 99.9999%). After 240 hours, the quality is improved to 7N (ie 99.99999%, the product quality 7N is the highest in the world), and the total amount of impurities is reduced to 0.1ppm and below.

[0014] The above experiments prove that using polytetrafluoroethylene with a purity of more than 99.99% and a thickness of 0.2-10 mm as a lining can bring unexpected commercial effects, which is a revolutionary progress in this field and provides a new method for the production of high-purity arsenic. An industrial heating production equipment.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B30/04C22B9/02
CPCY02P10/20
Inventor 华大伟马衡达
Owner 昆明鸿世达高技术材料有限责任公司
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