What material should be used when mixing 98% sulfuric acid with hydrofluoric acid?
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In the design process, I encountered a company that needs a mixture of sulfuric acid and hydrofluoric acid; what material should be used?
Hah~~~~~~~~ The temperature isn’t specified, but I think the fluoroplastic lining should work!
For temperatures below 150 degrees, steel can generally be used in combination with PTFE； If heat exchange is required, alloy steel must be used
This post was last edited by mrz8898 on 2010-11-21 at 13:57. First of all, thank you all for your generous help! When 300 kilograms each of 98% sulfuric acid and 40% hydrofluoric acid are mixed at room temperature, intense heat is released; cooling with circulating water should keep the temperature below 100 degrees.
The local temperature can exceed 100°,
Alloy steel should work~~~What about carbon steel? ?
Technical requirement entity: Yunnan Yuntianhua International Chemical Co., Ltd. Contact person: Li Zhixiang Phone: 0871－8596761； 0871-8596586 Address: No. 1417, Dianchi Road, Kunming City, Postal Code: 650228 I. Project Overview Develop a metal material that can resist a mixture of hydrofluoric acid and sulfuric acid under high-temperature conditions. Among them, in the mixture of hydrofluoric acid and sulfuric acid, the sulfate concentration is: 65.0～85.0% ； Fluoride ion concentration: 0.5～21% ； Ammonium ion concentration: 10.0–13.0%: ； The maximum temperature of the mixture is 160°C. The main contents of research and development include: ① trial production of materials ； ②Corrosion testing of materials ； ③Measurement of the thermal conduction, heat transfer properties, and other metallic properties of materials. II. Main problems to be addressed: At present, except for Hastelloy C, all metal materials are susceptible to corrosion by the aforementioned solutions. Moreover, Hastelloy C is expensive and must be imported. Although some non-metallic materials are currently capable of withstanding the corrosion caused by the aforementioned solutions, their heat transfer properties do not meet the required standards. Therefore, to resolve the aforementioned contradiction, it is proposed to develop a metal material resistant to corrosion by high-temperature mixtures of hydrofluoric acid and sulfuric acid. III. Targeted technical and economic indicators: ① Compared with the current Hastelloy C series, the cost will be reduced by 30%, while the thermal conductivity, heat transfer performance, and other metallic properties will remain comparable ； ②The corrosion rate in the aforementioned solution is ≤0.05 mm/year. IV. Existing conditions for project implementation: None. V. Cooperation mode: Technology development. VI. Total project investment: 500,000 yuan.