DBA、SDBS对渣油热反应中相分离及生焦粒度的影响

以辽河、克拉玛依常压渣油为原料，研究了渣油热反应过程中相分离状况及生焦粒度的变化，并考察了添加剂对相分离过程和焦炭粒度的影响。结果表明，辽河常压渣油中加入十二烷基苯磺酸钠（SDBS）、十二烷基苯磺酸（DBA）能够明显改变热反应过程中相分离的过程，体系的容焦、悬焦能力增加，焦的粒度明显减小；加入DBA后克拉玛依常压渣油热反应生焦量明显下降。在热反应过程中DBA等与沥青质胶粒的极性官能团作用，抑制超分子胶束缔合，体系的相分离得到延迟；由于DBA的加入开始生成的焦比较细小，但焦碳中心数量较多，这样在生焦总量相似的情况下，焦炭粒度会明显减小。

Effect of DBA、SDBS on phase separation and coking granularity during thermal reaction

In this paper, the phase separation and coke granularity of Liaohe atmospheric residuum (LHAR) and Karamay atmospheric residuum (KLAR) in the coking reaction were investigated. The effects of additives on the phase process and coke particle size were also investigated. The results showed that when sodium dodecyl benzene sulfonate (SDBS) and 4-Dodecylbenzenesulfonic acid (DBA) were added in LHAR,it could obviously change the phase separation process during the process of thermal reaction, the capacity of coking was increased and the size of coke was obviously reduced. The coke yield of KLAR in the coking reaction was decreased dramatically due to the addition of DBA. DBA could interact with the polar functional groups of asphaltene colloid in the process of thermal reaction. Therefore, the aggregation of asphaltene was inhibited and the phase separation of the system was delayed. The coke was smaller and the number of coke centers increased with the addition of DBA, So the coke size was reduced greatly when the total coke amount was similar.