关键词: 异构化, 催化剂, OparisNext, 反应进料, 操作参数, 二甲苯, 乙苯, C₈芳烃

Abstract:

This article introduces the industrial application of the isomerization catalyst Oparis^Next in an aromatics unit, analyzes and compares the isomerization rate of xylene, conversion rate of ethylbenzene, and loss rate of C₈ aromatics of Oparis^Next catalyst and I-400 catalyst during the operation of the unit, and elaborates on the optimization of operation. The results show that compared with the I-400 catalyst, the Oparis^Next catalyst has advantages such as high isomerization activity, an average increase of 0.35 percentage points in conversion rate, an average increase of 2.66 percentage points in ethylbenzene conversion rate, an average decrease of 0.03 percentage points in C₈ aromatic hydrocarbon loss rate, and stable performance. The catalyst activity decreased rapidly in the first half year after feeding, and then tended to be stable. The reaction temperature rise and hydrogen consumption can be significantly reduced by appropriately reducing reaction pressure or using mixed C₈ aromatics with low ethylbenzene and high C₈ naphthenic content during the initial feeding of catalyst. Adjusting the operating parameters of isomerization reaction according to the change of fresh feed composition can avoid the waste of catalyst activity and prolong the service life.

Key words: isomerization, catalyst, OparisNext, reaction feed, operating parameters, xylene, ethylbenzene, C₈ aromatics