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In recent years, most, if not all of Unipar's chloralkali plants switched from mercury/diaphgram technology, to membrane supplied/licensed by thysenkrupp nucera.

Sources:
(1) https://www.chemanager-online.com/en/news/unipar-upgrade-largest-chlor-alkali-plant-brazil#:~:text=The%20technological%20upgrade%20will%20ensure,production%20and%20lower%20energy%20consumption.
(2) https://unipar-institucional-prd.s3.sa-east-1.amazonaws.com/downloads_list_item/4079-unipar__r_s_2023__e_n_g__d2.pdf