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采用国产化材料组建电去离子(EDI)膜堆,并对EDI膜堆结构进行改造,在其浓水室填充离子交换树脂。试验研究表明,二级EDI膜堆与一级EDI膜堆比较,适应性强、产水水质好且在较短的时间内就基本达到稳定。二级EDI膜堆运行电流控制在2～3 A条件下,产水电阻率可在40 min以后基本稳定在17 MΩ.cm以上。在此基础上提出了一种新型的非蒸馏法注射用水制备工艺即反渗透-二级电去离子-超滤(RO-2EDI-UF)工艺。研究表明,RO-2EDI-UF制备注射用水,在理论上是可行的;工程实例也证明,产水电导率、细菌内毒素等各项指标均达到中国药典对于注射用水的标准。此工艺可显著降低系统设备投资、降低能耗,减少污水排放和噪声污染,水利用率较高,所制的注射用水具适宜的温度。完全可以替代离子交换法和蒸馏法用于注射用水的制备。
Electro-deionization (EDI) membrane stacks were fabricated using domestic materials, and the EDI membrane stack structure was modified to fill the concentrated water compartment with ion exchange resin. Experimental studies show that the second-level EDI membrane reactor compared with the first-level EDI membrane reactor, adaptability, water quality is good and in a relatively short period of time to basically stable. Under the condition of 2 ~ 3 A, the production resistivity of the second stage EDI membrane reactor can basically stabilize above 17 MΩ.cm after 40 minutes. On this basis, a new non-distilled water preparation technology for reverse osmosis - secondary deionization - ultrafiltration (RO-2EDI-UF) process is proposed. The research shows that the RO-2EDI-UF preparation of water for injection is theoretically feasible; engineering examples also prove that the conductivity of water, bacterial endotoxin and other indicators have reached the Chinese Pharmacopoeia standards for water for injection. This process can significantly reduce system equipment investment, reduce energy consumption, reduce sewage discharge and noise pollution, water utilization is higher, the injection of water with a suitable temperature. Can replace the ion exchange method and distillation for the preparation of water for injection.