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Anonymous Poster

Evaporator designing with ss316l

06/12/2008 12:35 AM

Sir,

We would like to construct a evaporator for evaportaing lower concentrated phosphoric acid to higher grade(35 % - 65%) . i would like to know the metal of construction to be used. Can SS316 or SS316l be used or we have to go for the higher grade metals like SANICRO. The temperature in the system will be a maximum of 120degree celsius. The cause i am thinking of is corrosion due to acid and the carbon content in traces in the phosphoric acid. Kindly give suggestion on this topic so that i can clear picture of it.

Regards,

Praveenretnam
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Tin-Man
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Join Date: Jan 2008
Posts: 6
#1

Re: Evaporator designing with ss316l

06/12/2008 8:58 AM

I have another though to your design. you could build the evaporator from carbon steel and coat the entire inside with thermal spray material that would perform very well in phosphoric acid service. (see www.ArcMelt.com) also we could do some testing as needed for you.

regards,
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Anonymous Poster
#2

Re: Evaporator designing with ss316l

06/13/2008 10:06 AM

Hi Praveen,

316L stainless will often fail by pitting in phosphoric acid service. This is typically due to impurities such as chloride and fluoride ions in the solution. The company I work for - Swenson Technology has built phosphoric acid evaporators. Much of the equipment is rubber lined and operates at lower temperatures than you suggest. Swenson has an affiliate in South Asia that might be able to provide you with a properly designed system.

Bruce Bishkin

bbishkin@swensontechnology.com
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