Method for saving water and reducing consumption in polycarbonate production process

The invention belongs to the technical field of resource recycling, and relates to a method for saving water and reducing consumption in a polycarbonate production process, which comprises the following steps: providing steam condensate water, detecting the conductivity of the steam condensate water, preparing a bisphenol A sodium salt solution by using the steam condensate water with the conductivity less than 90 [mu] s/cm instead of desalted water, and producing polycarbonate by using the prepared bisphenol A sodium salt solution. The steam condensate is condensate of an MVR (mechanical vapor recompression) system in the polycarbonate production process. According to the invention, the usage amount of desalted water can be saved, the energy consumption is reduced, and the production cost is saved. 本发明属于资源循环利用技术领域，涉及一种聚碳酸酯生产过程中节水降耗的方法，提供蒸汽冷凝水，检测蒸汽冷凝水的电导率，取电导率小于90μs/cm的蒸汽冷凝水代替脱盐水配置双酚A钠盐溶液，采用配置的双酚A钠盐溶液进行聚碳酸酯的生产；所述蒸汽冷凝水为聚碳酸酯生产过程中MVR系统的冷凝水。本发明不仅能够节约脱盐水的使用量，而且降低能耗，节省生产成本。