200 kt/a聚酯装置缩聚釜三甘醇清洗工艺的优化

Optimization of triethylene glycol cleaning process for polycondensation reactor of 200 kt/a polyester plant

使用三甘醇(TEG)对200 kt/a聚酯装置的聚合釜进行热清洗,在原工艺基础上优化了TEG热清洗工艺,并对优化前后的清洗效果进行了对比。结果表明:TEG热清洗工艺的优化措施主要为只对缩聚釜进行清洗、增加TEG用量、延长清洗时间、调控清洗温度及时间等;控制清洗温度270℃,预缩聚Ⅰ釜无搅拌浸泡2 h,预缩聚Ⅱ釜搅拌转速2.5 r/min、清洗时间6~8 h,终聚釜搅拌转速2.3 r/min、清洗时间10 h,清洗效果良好;以聚酯装置14区缩聚釜的清洗为例,与原清洗工艺相比,清洗工艺优化后,清洗效果明显提高,开车后熔体色相b值降低至6~7、熔体放流量降低至32.69 t。

Triethylene glycol(TEG)was used to thermally clean the polymerization reactor of 200 kt/a polyester plant.The TEG thermal cleaning process was optimized based on the original process,and the cleaning effects were compared before and after optimization.The results showed that the optimization measures of TEG thermal cleaning process mainly include only cleaning the polycondensation reactor,increasing the amount of TEG,prolonging the cleaning time,regulating the cleaning temperature and time,etc;the cleaning effect was good when the cleaning conditions were controlled as follows:cleaning temperature 270℃,soaking time 2 h without stirring in pre-polycondensation reactor I,stirring speed 2.5 r/min and cleaning time 6-8 h in pre-polycondensation reactorⅡ,stirring speed 2.3 r/min and cleaning time 10 h in the final polymerization reactor;and taking the cleaning of polycondensation reactor in zone 14 of polyester plant as an example,the cleaning effect was significantly improved after optimizing the cleaning process,and the melt hue b value and the melt discharge were reduced to 6-7 and 32.69 t,respectively,after start-up.