Heat of evaporation of sulfuric acid
Thread Content
Dear bosses, since I have never been exposed to the sulfuric acid industry, now because of a project, the company is preparing to evaporate and purify our sulfuric acid. I don’t know if H2SO4 can be evaporated by direct evaporation of 98 acid, or will it decompose into SO3 and H2O after it comes out, and then absorb it? 1. If it’s the former, I’ve searched a lot of information but can’t find the latent heat of vaporization of 98 acid, and I can’t seem to find it in the thick sulfuric acid manual. It would be great if anyone can help. Thanks in advance. 2. If it is the latter, what is the heat of decomposition, and what temperature and pressure is more suitable for operation? This is my first time posting, so my writing is a bit messy, please forgive me.
:oWhy should we evaporate and purify 98 acid? How about using 98 acid to continue absorbing sulfur trioxide, or directly using fuming acid? It is recommended that you check the physical and chemical data chapter P33 of the Sulfuric Acid Process Design Manual
Well, our company wants to produce ultra-pure sulfuric acid. There are currently two feasible methods, one is the direct absorption of SO3 vapor, and the other is the evaporation of 98 acid. Now I want to compare the energy consumption of the two methods, so I asked this question. I calculated it this way: under reduced pressure, the enthalpy of heating to the boiling point of 98 acid at 20 degrees is added to the enthalpy required for the evaporation of 98 acid, minus the enthalpy generated by the vapor of 98 acid to generate sulfuric acid. This is the case. Another situation is that SO3 gas is directly absorbed, and then the heat is generated. At a rough glance, it must be the first one that consumes energy, but I don’t know the value now, and the first one may waste a lot of acid. I hope any friend can help me.
http://www.h2so4.net.cn/html/1040/20081212/analysisView_153671_7896.shtml Related articles here!
I've read this article, but it doesn't have the information I need. depressed