What exactly is the vaporization heat of anhydrous hydrogen fluoride? Are there any authoritative figures available?
Thread Content
Anhydrous hydrogen fluoride is crucial for the fluorine chemical industry, yet its physical and chemical properties vary greatly across different technical books; it’s unclear how these values are obtained. On page 1025 of Volume 1, Fourth Edition of the \"Chemical Process Design Manual\" published by Chemical Industry Press, the vaporization heat of hydrogen fluoride is given as 372.76 Kcal/Kg ； In Tables 1–3 of \"Fundamental Data in Chemical Engineering\", the vaporization heat of hydrogen fluoride is 6.69 Kj/mol; on page 89 of \"Comprehensive Guide to Gas Applications\", the vaporization heat of hydrogen fluoride is 374.72 Kj/kg, while the specific heat at constant pressure is 40.3553 Kj/kg·K ； On page 455 of Matheson’s \"Gas Data Handbook\" published by the Chemical Industry Press in the United States, the vaporization heat of hydrogen fluoride is 1420.57 Kj/Kg, and its specific gas heat at constant pressure is 1.456 Kj/Kg·K ； I just want to ask: with so many professional books published by professional publishers, don’t you have even a hint of a spirit of rigor and honesty? Can professional data be published so carelessly? Do you realize the extent of damage that your incorrect data can cause to engineering projects? Is there still any authoritative data that can be trusted?
The units are inconsistent; conversion is needed for a proper display. If the temperatures corresponding to the heat of vaporization are not consistent, the values will differ. Was the corresponding temperature included when extracting the information? The publisher should indicate the source of the content; it is not responsible for the accuracy of the content. They do not have the capability to verify the authenticity of each piece of data
I don’t agree with your view. Since it is professional data, one must be responsible for its accuracy; this is an issue that can lead to serious safety accidents, and it’s not just a matter of whether the numbers are correct or not. Any professional citation is not a simple copy of a reference without careful consideration. The values for the vaporization heat of anhydrous hydrogen fluoride vary by more than a factor of 5 in several specialized books; such a significant discrepancy should prompt a professional editor to pay due attention and verify the figures before publishing them, rather than simply releasing them as is.
Take a look first to see if the units are consistent, and do the conversion yourself; if you can spot the problem, then those who compiled the book must be able to see it as well
The \"Chemical Process Design Manual\" states that the latent heat of vaporization is (1760 mmHg). In Tables 1–3 of the \"Basic Data for Chemical Engineering,\" it is clearly specified that the heat of vaporization at the boiling point is 6.69 KJ/mol, which equals 334.5 KJ/kg. The \"Comprehensive Guide to Gases\" gives a value of 374.72 KJ/kg for the heat of vaporization at 19.51°C and 101.325 kPa; this value is not very different from the previous ones. However, the data in the \"Gas Data Manual\" differs significantly, possibly due to translation issues
Anhydrous hydrogen fluoride in liquid form is a monomeric medium without any electrolytes; it is non-conductive, so an HKE electromagnetic flowmeter cannot be used. Anhydrous hydrogen fluoride liquid is non-corrosive; the HK-CMF mass flow meter can be used, along with a sensor featuring a 316L measurement tube ； For absolute certainty, an HC alloy sensor can also be used. If the precision is not high, a metal rotameter lined with PTFE can be considered.