Material of the mixed acid evaporation tower
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We want to evaporate and concentrate a mixed acid of 50% phosphoric acid + 35% sulfuric acid at room temperature, around 100 degrees Celsius. What material offers the best cost-performance ratio? Enameled, lined with butyl rubber, or lined with fluorocarbon? It is hoped that it will be inexpensive, with reliable performance and low maintenance requirements. I would appreciate suggestions from the experts.
Recommendation: Teflon ETFE will suffice for the anti-corrosion coating inside the equipment. The material is polytetrafluoroethylene, also known as tetrafluoride anti-corrosion coating
It depends on the specific requirements of your manufacturing process! Such as the concentration of phosphoric acid, the reaction temperature, etc
I wasn’t fully aware of it just now and didn’t look closely. Given the poster’s qualifications, I think they have the time to come to our company for a trial run! As a result of evaporation, I’m not sure if it will meet your requirements; I’m from Nanjing!
65% phosphoric acid + 20% sulfuric acid, maximum temperature of 100 degrees Celsius. After checking, enamel, PTFE, and butyl rubber are all suitable options. From an operational perspective, one of them is more reliable, requires less maintenance, and of course has a reasonable price as well. I hope experts can give some advice.
What does the poster want to steam? Enameled materials can withstand such conditions. I’m not sure what the structure of your equipment is; different manufacturing processes such as those used for PTFE-enameled materials result in varying prices, as the process itself affects the cost. If you’re interested, the original poster can send the drawings to my email at 77390271@qq.com and I’ll give you a reference price!
This post was last edited by Wang Genrong on 2015-12-29 at 10:38. 65% phosphoric acid + 20% sulfuric acid; at a maximum temperature of 100 degrees Celsius, the boiling point isn’t reached under normal pressure, right? To evaporate and concentrate at 100 degrees, a negative pressure must be applied. Care must be taken when using PTFE or butyl rubber linings under negative pressure; even the slightest defect in the lining quality or a minor mistake during operation can lead to serious consequences. To use enamel-lined equipment, it depends on the level of phosphoric acid impurities present. Industrial-grade phosphoric acid usually contains fluoride ions, and due to the presence of these ions, even in low concentrations, they can cause corrosion and damage to the enamel-lined equipment. I recommend the use of a graphite evaporation and concentration unit, which consists of a graphite heater, a graphite evaporation tank, a graphite pre-concentration unit, a water jet injector, and piping systems. The graphite concentration device can be used for a long time under these operating conditions without any corrosion.
Is there no feedback regarding the production of wet phosphoric acid? From the information I’ve seen, don’t you use evaporation tanks with butyl lining? Which company made it?