Seek a mature hydrogen chloride drying process
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Our unit plans to install new equipment for the synthesis, drying, and transportation of 80,000 tons of hydrogen chloride. It has been determined that the hydrogen chloride contained in the compressor must have a water content of less than 100 ppm; therefore, we are seeking mature technology for hydrogen chloride drying.
HCL can be dried with concentrated sulfuric acid, as it is also acidic
Thank you! Is it necessary to first cool the hydrogen chloride gas to a low temperature, around minus 15 degrees, before drying it with sulfuric acid?
Yes, generally the lower the temperature, the better the drying effect
Low temperature can condense moisture; sulfuric acid is used for drying, with a heat exchanger to remove the heat generated by the sulfuric acid
The drying of hydrogen chloride generally involves the following steps for stepwise water removal: 1. High-temperature gas exiting from the synthesis furnace, with by-product steam or air cooling； 2. Circulating water cooling ； 3. Cooling with frozen brine, but it should be noted that lower temperatures are not necessarily better (Floor 5); the dehydration process through cooling using hydrogen chloride essentially involves the formation of high-concentration graphite hydrochloric acid. High-concentration hydrochloric acid freezes at -17.5°C, so for PVC production, it is best to keep the temperature of the frozen brine above -17°C ； 4. For processes with more stringent requirements regarding moisture content, a 98% sulfuric acid drying process is required.
New technology, add me at 13324528344
Hello, OP. Is online concentration monitoring of hydrochloric acid and sulfuric acid necessary? Feel free to reach out if needed. 18615997765
The purity of hydrogen chloride can be monitored using online instruments, as can the moisture level. Those interested can take a look here: www.songqichao.com/index.php?m=home&c=View&a=index&aid=156