Abstract:

Settling aids method is one of the most used approaches to remove solid particles from catalytic cracking slurry. Focus on the shortcomings of exiting slurry settling aids, an amino-terminated block polyether, which combined amine groups that provided hydrogen bonds and acid-base pairs with block polyether that provided bridging action, was prepared and determined by liquid nuclear magnetic spectrum. The comparative experiments showed that the amine group and block polyether played a synergistic role, and the linkage promoted the dispersion of amine groups in the oil slurry. In order to facilitate industrial applications, the amino-terminated block polyether was compounded with solvent oil and glycol to prepare the resultant settling aids with different contents. Through the investigation of the dosage, settling temperature and settling time, the optimum process conditions were determined as follows: the settling aids with 40% amino-terminated block polyether contained was added into oil slurry with a dosage of 400mg/kg and kept at 90℃ for 48h. With this process, the deash efficiency can be more than 90% and the residual ash in the upper slurry can be less than 0.02%, which can be used to prepare high-value products, such as advanced carbon black. For this high effective settling aids, the raw materials is easy to obtained, thus it has a great potential for industrial production and applications.

Key words: catalytic cracking, terminal-amino groups, block polyether, slurry, settling aids

摘要：

沉降助剂法是脱除催化裂化外甩油浆中固体颗粒的有效方法。针对现有油浆沉降剂中存在的不足，本文将提供氢键和酸碱对作用的胺类基团与提供架桥作用的嵌段聚醚相结合，制备出一种端氨基嵌段聚醚，并通过液体核磁图谱确定其化学结构。对比实验证明，胺类基团与聚醚结构起到协同作用，且键接的方式有助于促进胺类基团在油浆中分散。为方便后续应用，将端氨基嵌段聚醚与溶剂油、乙二醇进行复配，得到不同含量的端氨基嵌段聚醚类油浆沉降剂。通过对加剂量、沉降温度和沉降时间的考察，确定最佳沉降工艺为加入400mg/kg端氨基嵌段聚醚质量分数为40%的沉降剂，在90℃下沉降48h。此时脱灰率能达到90%以上，可将灰分降至0.02%以下，可用于生产高级炭黑等高附加值产品。该沉降剂原料易得且效果好，有望实现大规模的工业化生产和应用。

关键词: 催化裂化, 端氨基, 嵌段聚醚, 油浆, 沉降助剂