摘要
探讨了气相法线型低密度聚乙烯(LLDPE)高负荷生产中的聚合反应热平衡、物料平衡和生产控制等过程。反应系统的撤热能力、出料系统的出料能力、催化剂的控制和风送系统的输送能力是气相法LLDPE高负荷运行的瓶颈。从优化反应撤热效果、防止出料、排料和风送系统的恶化、精准控制催化剂等方面提出了改进措施和建议。将反应器内异戊烷摩尔分数控制在8.8%~12.3%,增加LLDPE粉料堆密度,建立合适的脱气仓料位高度和氮气流量,可以有效地提高出料、排料和风送系统的送料能力。
The thermal equilibrium, material balance and process control in the gas phase linear low density polyethylene （LLDPE）plant were observed. The heat removal capacity of the reactor, conveying capacity of the product discharge system （PDS）, control of the catalyst, and conveying capacity of the air conveying system are regarded as bottlenecks in the plant at high load operation. Suggestions and solutions are offered to eliminate these bottlenecks, which involve catalyst control, optimization of the heat removal effect, prevention of the PDS and the air conveying system from worsening. It concludes that controlling the mole fraction of isopentane in reactor within 8.8%-12.3%, increasing the stacking density of LLDPE powder and establishing suitable bed level and nitrogen flow rate in the purge column can improve the conveying capacity of the PDS system and the air conveying system.
出处
《合成树脂及塑料》
CAS
北大核心
2017年第2期57-60,共4页
China Synthetic Resin and Plastics
关键词
聚乙烯
高负荷
瓶颈优化
polyethylene
high load
bottleneck
optimization
