fuming sulfuric acid
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Is the maximum value for fuming sulfuric acid 105%? Is there a higher one?
Yes, they are differentiated based on the varying levels of free SO3
GB534 for industrial sulfuric acid specifies the technical requirements for fuming sulfuric acid; you can check it out
Commonly used ones include Acid 105 and Acid 115
The concentration of free SO3 in niacin can reach 100%. However, in industry, those with a value below 120 are commonly used (with free SO3 less than 20%), as the freezing point of nicotinic acid is relatively low under these conditions. http://bbs.hcbbs.com/thread-937254-1-1.html Here is a graph showing the relationship between niacin concentration and freezing point
There are higher levels; we produce 10.4% nicotinic acid, with free SO3 at 20%.
The nicotinic acid content in regular commercial products is 105%; it can be customized for special cases.
The national standard product is 104.5%, which is what we commonly refer to as 20 acid； There is also one at 115%, which is what we commonly refer to as 65 acid; there is no national standard for it ； Then there’s 122%, which refers to liquid sulfur trioxide; it has a national standard designation ；
Yes, 105, 115 liquid sulfur trioxide, and so on
The actual value is 104.5, which refers to fuming sulfuric acid; there is also a value of 114.5%, corresponding to an even higher concentration of fuming sulfuric acid
According to national standards, fuming sulfuric acid is classified into three types, with free sulfur trioxide contents of 20% (or 104.5%); 25% (or 105.63%); and 65% (or 114.6%). 30% is also commonly used abroad
How is it calculated that the free sulfur trioxide content is 20% while the sulfuric acid concentration is 104.5%? ? ? :dizzy:
The higher value for nicotinic acid is 122.5%, while the free SO3 content is 100%