Abstract Naphtha feedstock used for the steam-cracking process is typically blended from several hydrocarbon source streams of composition varying in a broad range. This study aims at evaluation of the potential yield improvement, which could be obtained by separate steam-cracking of light and heavy sub-streams using tailored process parameters for each of the sub-streams. Laboratory pyrolysis reactor was used for both separate and blend processing of the naphtha feedstocks in the temperature range of 760–810 C, and different blending ratios. At maximum temperature, pyrolysis of light naphtha provides ethylene yield 24.1 wt. %, while only 13.6 wt. % of ethylene was obtained from heavy naphtha. Both, ethylene and propylene yield express decreasing trend with increasing content of heavy naphtha in blended feedstock. Obtained results suggest possibility of mutual effects between components resulting in non-linear dependence of products yields on the blending ratio, therefore a principle of additivity cannot be assumed. A potential for improvement of ethylene yield by 1.1 wt. % is shown on example of processing scenario.

中文翻译：

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通过混合/分离处理提高石脑油原料的蒸汽裂解效率

摘要 用于蒸汽裂化过程的石脑油原料通常由多种组成变化范围广泛的烃源流混合而成。该研究旨在评估潜在的产率改进，这可以通过使用针对每个子流的定制工艺参数对轻和重子流进行单独的蒸汽裂解来获得。实验室热解反应器用于在 760-810 C 的温度范围内和不同的混合比例下对石脑油原料进行分离和混合处理。在最高温度下，轻石脑油的热解提供了 24.1 wt% 的乙烯产率。%，而只有 13.6 wt. %的乙烯是从重石脑油中获得的。随着混合原料中重石脑油含量的增加，乙烯和丙烯收率均呈下降趋势。获得的结果表明成分之间可能存在相互影响，导致产品产量对混合比的非线性依赖性，因此不能假设可加性原理。乙烯产量提高 1.1 重量％的潜力。% 显示在处理场景的示例中。