重整反应苛刻度低原因分析及处理措施

针对金陵石化I重整装置2016年2月出现的脱庚烷塔底物料中非芳含量上升、抽提原料中非芳含量上升、反应总温降下降以及单位产氢量下降等反应苛刻度低的问题进行详细分析,总结出可能引起反应苛刻度低的四个方面条件:I重整进出物料换热器内漏、原料性质、操作条件及催化剂性质,并分别对四个方面的条件进行详细的数据对比分析,最后得出本次I重整装置反应苛刻的低的主要原因为增加了S含量高达(4~6)×10-6的II加氢裂化装置重石掺炼量,致使重整催化剂出现轻微的S中毒,加快了催化剂积碳速率,且因I重整装置扩容改造后未增加催化剂再生能力,再生能力不足直接导致待生催化剂中C含量高达6.66%,从而使重整催化剂金属活性降低,直接降低了催化剂烷烃脱氢环化性能,使I重整反应苛刻度下降,脱庚烷塔底C8+物料及抽提进料中非芳含量明显升高。

Reason Analysis and Measures of Reforming Reaction Low Severity

In No.1 reforming unit of Sinopec Jinling company, some problems appeared in February 2016, such as increasing of non-aromatics content in the bottom of heptane column, increasing of non-aromatics in extraction feed, decreasing of the total reaction temperature drop and decreasing of unit hydrogen production and so on. In this article, these problems were analyzed, and four possible conditions leading to the reaction severity decreasing were summarized: inner leakage of feed-effluent heat exchanger of No. 1 reforming unit, property of feedstock, operation condition and property of catalyst. The data related to these four conditions were analyzed comparatively. The results showed that and main reason of the reaction severity decreasing was the increase of heavy naphtha (high sulfur content 4×10-6~6×10-6) blending ratio in No. 2 hydrocracking unit to cause sight sulfur poisoning of reforming catalyst, which accelerated the carbon deposition on the catalyst. And after the extension project of No.1 reforming unit, the regeneration capacity was not enlarged accordingly, the lack capacity of regeneration led directly to the high carbon content (as high as 6.66%) of spent catalyst, which decreased the metal activity in the catalyst and directly decreased the catalyst property for dehydrocyclization and resulted in the decreasing of reaction severity of No. 1 reforming unit, increasing of C8+ and non-aromatics content in bottom of heptane column obviously.