Abstract

Hydrostabilization of straight-run naphtha pyrolysis condensate in the presence of a commercial nickel–chromium catalyst at 80–120°С, hydrogen-to-feed ratio of 0.3–0.8 m³/L, and process time of 30– 120 min was studied. The hydrostabilized pyrocondensate yield increases with an increase in the hydrogen content. The degree of hydrogenation has pronounced temperature dependence at a low-hydrogen hydrogen-to-feed ratio, whereas with an increase in this ratio the temperature dependence levels off. A detailed study of the fractional and component composition of the hydrostabilized pyrocondensate revealed significant differences in the catalyst selectivity depending on the reaction conditions. Low process temperature and high hydrogen-to-feed ratio favor intense formation of aromatic hydrocarbons (at 100°С and hydrogen-to-feed ratio of 0.8 m³/L, the yield was 82 wt %), whereas at elevated temperatures and low hydrogen content the formation intensity shifts toward isoparaffins (at 120°С and 0.5 m³/L H₂, the yield was 32 wt %). A possible hydrogenation mechanism ensuring the selectivity of the nickel–chromium catalyst in the process was outlined. The parameters of the fractional and hydrocarbon compositions and the octane numbers of the distillates obtained allow them to be suggested as components of motor fuels.

中文翻译：

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镍铬催化剂存在下直馏石脑油焦缩合物的加氢稳定

摘要

在商业镍铬催化剂存在下，在 80-120°С，氢气与进料比为 0.3-0.8 m ^{3的情况下，直馏石脑油裂解冷凝物的加氢稳定}/L，并研究了 30-120 分钟的处理时间。氢化稳定的焦缩合物产率随着氢含量的增加而增加。在低氢气与原料的比率下，氢化程度具有显着的温度依赖性，而随着该比率的增加，温度依赖性趋于平稳。对氢化稳定的焦缩合物的馏分和组分组成的详细研究揭示了催化剂选择性取决于反应条件的显着差异。低工艺温度和高氢进料比有利于芳烃的强烈形成（在 100°С 和氢进料比为 0.8 m ³/L，产率为 82 wt%），而在高温和低氢含量下，形成强度向异链烷烃转移（在 120°С 和 0.5 m ³ /LH ₂下，产率为 32 wt%）。概述了确保镍铬催化剂在该过程中的选择性的可能加氢机制。馏分和烃组成的参数以及所得馏出物的辛烷值允许它们被建议作为发动机燃料的组分。