Comparison of investment costs for caustic soda produced by the ion exchange membrane process and the diaphragm process at the same scale
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This post was last edited by sunjl1981 on 2013-1-6 at 23:34. Our company plans to launch a PVC production project with an annual capacity of 400,000 tons, along with a caustic soda production facility capable of producing 360,000 tons per year. Due to funding constraints, we are considering using the diaphragm process for the caustic soda production; everyone please discuss the investment costs associated with these two methods. # ， ， &
Let me start by saying that the diaphragm process requires less investment in terms of capital costs for producing caustic soda compared to the ion exchange membrane process. However, it has no advantages over the latter in terms of operating costs or product quality. The investment required for subsequent processes such as evaporation is much higher in the case of the diaphragm process. Currently, in China, the production capacity of caustic soda via the diaphragm process is only 50,000 tons per production line, and this approach is not very convenient from both operational and management perspectives. The quality of the alkali he produces is poor as well; it has a high salt content, which limits its sales. Although the diaphragm process for producing caustic soda has advantages in terms of investment, overall, the ion-exchange membrane process offers greater advantages.
From a legal and regulatory perspective, I suggest that the original poster pay more attention to the new policies regarding caustic soda, especially the entry requirements for the chlor-alkali industry. Of course, **the diaphragm process is not currently prohibited, but it faces more environmental issues than the ion-exchange membrane process; its use of asbestos and the problems associated with waste discharge have a significant impact on both human health and the environment. Additionally, it is not known where the owner’s company will be located. At present, all provinces and cities have set **energy-saving and consumption-reduction targets**, so the requirements regarding energy consumption in the caustic soda industry are quite low, especially in more developed areas. The diaphragm process, due to the need for alkali evaporation to produce 31% alkali, results in a significant increase in overall energy consumption, leading to high total investment and operating costs. Initial preparations need to be given thorough consideration, as they are fundamental to the development of a company.