Gas separation
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I came across a patent related to the separation of hydrogen chloride and phosgene. It states that the temperature at the top of the tower is around 30% phosgene concentration, and that temperature is -9 degrees. However, my calculations show that to meet the separation requirements specified in that patent, the temperature at the top of the tower should be around minus thirty to forty degrees. What could be the reason for this? PS. The boiling point of hydrogen chloride is around -80 degrees, while that of phosgene is 8 degrees. The two should be easy to separate, but I’m a bit confused. Please advise
I’m here to add some supplementary information: Phosgene. Names: Phosgene; carbon oxychloride; carbonyl chloride; chloroformyl chloride. English names: Phosgene; carbonyl chloride. Molecular formula: COCl2. Molecular weight: 98.92. Structure: see figure. CAS No.: 75-44-5. National standard code: 23038. Phosgene is an important organic intermediate, used in pesticides； Modern Medicine ； Engineering plastics ； Polyurethane materials have many uses, as does **. In pesticide production, it is used to synthesize the carbamate insecticide carbofuran ； Carbaryl ； Many varieties such as leafhopper powder are also used in the production of the fungicide carbendazim and various herbicides. China’s Linxiang Amino Chemicals Factory and Ningyang Pesticide Factory have become production bases for carbamate pesticides, with Ningyang Jiaoyao Factory capable of producing 43 different varieties. Isocyanate-based products produced from phosgene, such as TDI, MDI, and PAPI, are used in rigid polyurethane foams ； soft foam ； elastomer ； Important raw materials for synthetic leather ； Certain types of isocyanates are widely used in polyurethane coatings ； There are also special varieties used as adhesives, such as Lenox glue. It is used in the dye industry to produce dye intermediates such as alizarin acid, and in the defense industry to produce the fixing agent dimethyldiphenylurea as well as as a military poison gas. Chloroformates produced using phosgene are pesticides ； Pharmaceuticals ； Intermediates for organic synthesis such as polymerization initiators. When producing the engineering plastic polycarbonate by the direct phosgene method or the transesterification method, phosgene is required as a raw material. Phosgene is highly toxic and a strong irritant ； Asphyxiating gases. Inhalation of phosgene causes pulmonary edema ； Pneumonia and other conditions pose a risk of death.
You haven’t specified the pressure; how can it be calculated?
Patents can be misleading sometimes. To prevent infringement, intentionally blur it
That’s right; I’ve seen the patents of our company, and they’re quite different from our actual manufacturing processes. Haha, I was surprised too when I saw them for the first time