| 摘要 |
In a first embodiment of the invention, a method for determining the hydrogen-to-carbon ratio of a liquid hydrocarbon fraction is presented. A sample of the liquid fraction is subjected to an ultra-violet absorption analysis. The results of the analysis correlate directly to the hydrogen-to-carbon ratio of the hydrocarbon fraction and, with a knowledge of this correlation, the hydrogen-to-carbon ratio of the sample under analysis may be determined. Another embodiment provides a method for monitoring the performance of a process for the preparation of olefins by the thermal cracking of a hydrocarbon feedstock. A liquid fraction is recovered from the product of the thermal cracking and subjected to an ultra-violet absorption analysis. The result of the analysis correlates directly to the hydrogen-to-carbon ratio of the product, which in turn correlates to the cracking severity being applied in the thermal cracking process. Thus, the analytical result may by employed in a system to control the thermal cracking process. Further, when the result of the analysis is corrected for the nature of the hydrocarbon feedstock and the yield of the liquid fraction, the result correlates directly to the rate of formation of quench exchanger coke in the thermal cracking process. The corrected result may thus be used to monitor and control the coking rate.
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