一、腐蚀概况我国从日本引进的三套及自制的九套聚乙烯醇生产装置中,回收醇解生产的母液都采用了脱氧铜制的醋酸浓缩塔。这些脱氧铜塔投产以来都发生了程度不同的腐蚀。进口的塔腐蚀较轻,如上海石化总厂化工二厂的脱氧铜塔,使用5年后,除了底层——第一层塔盘的筛孔增大外,其余各层塔 First, the corrosion profile China imported from Japan and three sets of self-made nine sets of polyvinyl alcohol production plant, the recovery of alcohol production of the mother liquor are made of deoxidized copper acetate concentration tower. These deoxidation copper towers have been put into operation to varying degrees of corrosion. Imported tower corrosion lighter, such as Shanghai Petrochemical Plant Chemical Plant deoxidized copper tower, the use of 5 years, in addition to the bottom - the first layer of the tray sieve increases, the remaining layers of tower