Project of East Siberian Crude Oil Processing Equipped with Delayed Coking Unit

Abstract

In addition to light products, delayed cokers produce valuable coke such as anode coke and needle coke. The production of these useful light products and coke has made it profitable and interesting for the refinery industry to look into the processing of heavy oils as oil reserves continue to decline. In this thesis, a laboratory delayed coker was constructed and modeled in a software (Aspen Hysys) to estimate light fractions and coke that can be produced from a sample of crude oil obtained from the Vankor Oil field. Beginning with the crude properties testing procedures to find out the compositional properties of sample, distillation under atmospheric and vacuum conditions. The distillates/fractions obtained is examined through gas chromatography, FIA analysis, density of each fractions including the crude, and lastly the Sulphur content measuring. The results stipulated the profile of the crude to be heavy with a Sulphur percentage of 0.72 by mass and a density of 0.920kg/m3 at 15 °C. After employing other refining processes such as reforming and isomerization, light fraction such as gas oil fraction formed the major straight run fractions, while the employment of the delayed coking process gives additional 3.2 % by weight of naphtha and alkylation 1.14 wt.%. The results from the software model showed that the production light fractions and coke can be optimized by varying parameters such as temperature and pressure using variables such as light fractions and coke yield. However, in the work the amount of coke produced was linked to the variable maximum light fractions but quality coke. These and other issues are discussed in the thesis.