Regarding the issue of liquid chlorine products, what is the difference in quality between liquid chlorine produced by the low-temperature and low-pressure method and that produced by the normal-temperature and high-pressure method?
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This post was last edited by sunjl1981 on 2013-1-6 at 23:50. Hello everyone, I have a question: My company produces liquid chlorine. One production process involves liquefaction at low temperature and low pressure, using turbines to achieve liquefaction at -20 degrees Celsius; the other process involves liquefaction at normal temperature and high pressure, using 3K machines to reach a pressure of 0.5 MPA with York compressors. The purity of the liquid chlorine produced in both processes is over 99.6%, and all specifications meet the required standards. However, users report that liquid chlorine at low temperature and low pressure has better quality than that at normal temperature and high pressure. This is because for the downstream products produced by these users, such as aluminum trichloride, aluminum trichloride manufactured using liquid chlorine at low temperature and low pressure is golden in color and of excellent quality, whereas aluminum trichloride produced using liquid chlorine at normal temperature and high pressure turns dark yellow in color, resulting in substandard product quality. We analyzed both types of liquid chlorine, and their purity, including the water content, was within normal ranges. This is quite puzzling to us; we would be extremely grateful if experts and colleagues with relevant experience could provide some guidance # + + .
Reply to 1# ysl12345: I think the liquid chlorine produced by the low-temperature and low-pressure method might also be of better quality. Or more precisely, liquid chlorine produced by the low-temperature and low-pressure method is more suitable for the production of aluminum trichloride products ； My understanding is that the purity of liquid chlorine can be the same in these two processes; the key difference lies in the other components. In the low-temperature and low-pressure method, the other components involved in liquefaction are those with low boiling points, while in the high-temperature and high-pressure method, it is the compounds with high boiling points that are liquefied.
What are the high and low boiling points compounds in liquid chlorine production, especially in ion-exchange membrane caustic soda?
Reply to 3# czh991207: I believe that the high-boiling and low-boiling substances mentioned here refer to the non-condensable gases with different components present in chlorine.
Reply to 1# ysl12345: My understanding is – is the iron content in liquid chlorine produced by the high-temperature and high-pressure method higher than that in the product obtained using the low-temperature and low-pressure method? If so, were these two sets of devices installed at the same time? Is it related to the installation of piping equipment? If it’s not due to installation issues, could it be that under high temperature (normal temperature) and high pressure, chlorine reacts more intensely with the heat exchange tubes of the condenser, resulting in more iron elements being incorporated into the product? I haven’t done any research on it, so it’s hard to say; maybe the original poster should have have their iron level tested. Because the impurity gases brought in by chlorine in the gas phase have extremely low freezing points, the temperature and pressure conditions required for liquid chlorine to liquefy are not low enough to bring them below their critical temperature. The impurity that can mix into the system is most likely iron.
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