实验以钛系催化剂生产的小中空聚乙烯5831D、BL3和BM593三种高密度聚乙烯（HDPE）为原料，结合三釜串联、双釜串联以及双环管的3种不同装置工艺特点进行深入研究。首先，通过对5831D、BL3和BM593的物性分析，探讨它们在不同装置工艺下的聚合性能和产物特性差异。其次，采用差示扫描量热仪、毛细管流变仪等对3种原料进行表征对比分析。研究发现，不同装置生产的HDPE在分子结构、分子量分布、熔融性能等方面存在差异。三釜串联的5831D相较于双釜串联的BL3具有更低的熔体流动速率（MFR），但分子结构较为复杂，有助于提高产品的M_w。不同反应器的产品分子量分布也不同，三釜反应器的分布更宽，更利于加工。此外，研究还涉及产品的熔融性能、结晶性能、热力学特性、剪切变黏稠等方面的测试和分析。通过系统性的实验和分析揭示了这3种工艺在小中空聚乙烯生产中的优劣势。研究结果不仅对小中空聚乙烯的生产工艺优化具有指导意义，同时也为理解HDPE的合成机理提供了有益的信息。

In this paper, three kinds of high density polyethylene(HDPE) of small hollow polyethylene 5831D, BL3 and BM593 produced using titanium-based catalysts were taken as raw material, are studied in depth in combination with the characteristics of three different reactor configurations: Three-reactor cascading, double-reactor cascading, and double-loop reactor systems. Firstly, through a physical property analysis of 5831D, BL3, and BM593, the paper explores their polymerization performance and product characteristics under various reactor configurations. Subsequently, a comparative analysis is performed using techniques such as differential scanning calorimetry and capillary rheometry to characterize and contrast the three raw materials. The research reveals differences in molecular structure, molecular weight distribution, and melt properties among the HDPE products produced in different reactors. For instance, 5831D from the three-reactor cascading system exhibits lower melt flow rate (MFR) compared to BL3 from the double-reactor cascading system, but it possesses a more complex molecular structure, contributing to an enhanced M_w of the product. The molecular weight distribution of products from different reactors varies, with the three-reactor system yielding a broader distribution, which is more conducive to processing. Additionally, the study encompasses tests and analyses related to product melt properties, crystalline performance, thermodynamic characteristics, shear-thinning viscosity, and more. Through systematic experiments and analyses, the paper elucidates the advantages and disadvantages of these three processes in the production of small hollow polyethylene. The research results not only provide guidance for optimizing the production process of small hollow polyethylene but also offer valuable insights into the synthesis mechanism of HDPE.