大庆渣油液态组分催化裂化生焦倾向

COKE FORMING TENDENCY OF LIQUID FRACTION OF DAQING RESIDUUM IN FCC PROCESS

渣油催化裂化的一个重要特点.就是在裂化温度下仍为液态的高沸组分和已汽化的组分一起以不同方式参与催化剂颗粒内的传递过程和裂化反应.采用抑制气态油品反应的方法考察了渣油中液态油品的生焦。结果表明.反应温度是影响生焦率的主要参数。其次是油品的升温速率 渣油经冲洗色谱分离的三组分中胶质的生焦倾向最大.温度对它的影响亦最大.饱和烃及芳香烃对胶质裂化生焦的影响不明显.

One of the significant differences between residuum FCC and VGO FCC lies in that high boiling point fractions of the vaccuum residuum in liquid state, along with vaporized fractions take part in the transfer processes and chemical reactions within the catalyst particles in a different way to yield cracking products and coke. The coke formation of the liquid fraction was investigated separately by suppressing the vapor phase reactions. The results showed that reaction temperature was the major parameter to affect coke yield, and heating rate in the second place. The coking tendency of the resin was the greatest and was influenced most intensely by reaction temperature. It was also noted that there seemed to be some interactions, though weak and elusive, among various fractions when they were mixed together.