The PVC industry upgrading project jointly implemented by our company and the Chlor-Alkali Chemical Branch of Ordos Electric Power Metallurgical Group aims to create a circular economy benchmark for the chlor-alkali industry, focusing on the construction of supporting projects for the production capacity of 400,000 tons/year of polyvinyl chloride and 300,000 tons/year of caustic soda. The core supporting 9360t/d ultra-large-scale desalted water treatment system adopts the "multi-barrier integrated desalination process": the raw water first passes through a multi-media filter to remove large particle impurities, then implements micron-level solid-liquid separation through an ultrafiltration membrane assembly, and then enters the reverse osmosis device to complete more than 98% of salt pre-removal, and finally passes through a mixed ion exchanger for nano-level ion removal, so that the resistivity of the produced water is stably maintained at the ultrapure water standard of 5MΩ·cm, fully meeting the strict requirements of polyvinyl chloride polymerization reactors and ion membrane caustic soda devices for water purity. The system integrates and applies technologies such as intelligent dosing control and modular backwashing to achieve a 22% reduction in operating energy consumption compared to traditional processes, setting a model for the transformation and upgrading of water treatment systems in high-energy-consuming industries.
