国产BC-249Ⅳ型高负荷苯酐催化剂的工业应用

INDUSTRIAL APPLICATION OF DOMESTIC BC-249 Ⅳ HIGH LOAD PHTHALIC ANHYDRIDE CATALYST

在金陵石化公司苯酐装置上,考察了北京化工研究院开发的高负荷BC-249Ⅳ型苯酐催化剂的应用情况。结果表明,该催化剂的诱导期从投料至90g负荷所用时间长度为55d,进口催化剂诱导期为58d,基本相同。两年正常生产期内,在反应器单管风量4m3/h、盐浴温度358℃、邻二甲苯质量浓度90g/m3的反应条件下,反应器出口气体中苯酐含量均处于95.6%之上,苯酐产品收率下降较慢,两年内苯酐装置精苯酐平均质量收率达108.55%。工艺运行数据表明:采取减少装置非计划停次数及开工前将盐温提高10℃两项措施,可加强催化剂的稳定性;BC-249Ⅳ型苯酐催化剂的性能达到了同类型进口苯酐催化剂的标准。

Application of high load BC 249 Ⅳ phthalic anhydride catalyst, developed by Beijing Re search Institute of Chemical Industries, in PA plant of Jinling Petrochemical Corporation was studied. Process changes and stability in induction and normal production period of the catalyst were investiga- ted. 55 days are needed for induction period from initial feeding of the catalyst to 90 g loads, almost the same as that of the imported one, about 58 days. During the twowear＇s normal production period, under the conditions of reactor single tube air volume 4 m3/h, salt bath temperature 358 ℃, o-xylene mass density of 90 g/m3 , the PA content of the reactor outlet gas has been above 95.6%, PA product yield decreased quiet slowly, average mass yield of the fine phthalic anhydride was 108.55 %. Process data show that BC 249 IV type phthalic anhydride catalyst achieves the same standard compared with the same type of imported phthalic anhydride catalyst. In addition, two measures should be taken to strengthen the stability of the catalyst. One is to reduce the times of unscheduled shutdown, another is to increase the salt temperature by 10 ℃ before start-up.