Gas selection for bisphenol A granulation tower
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In the bisphenol A production process, the granulation units used by Badger and Mitsubishi in Japan are both granulation towers; however, the former uses air for granulation while the latter uses nitrogen. Does air granulation not have an impact on product quality at 200°C?
We all use LG’s bisphenol A from South Korea. I don’t know how to granulate it. Previously, those available in China were in powder form; I’ve never used them. For our testing, we melt the samples in a muffle furnace for 15 minutes and check their color; if the color is satisfactory, we keep the sample.
Bisphenol A undergoes yellowing when it is exposed to air at high temperatures for an extended period of time. In the actual granulation process, bisphenol A at high temperatures is in contact with air for only a short time and is cooled down quickly, so yellowing hardly occurs； I heard about it too. :)
Do you deal in PCs or epoxy resins?
Do you know which company designed and manufactured the granulation process at Yanshan Mitsubishi?
Ookawara in Japan, nitrogen granulation. Currently, air granulation is the mainstream method.