Application of Heavy Solvent Deasphalting in Sour Resid Processing

Complete conversion of resid into light oil needs to consume large amount of hydrogen, because the light oil has higher hydrogen content. The conversion of whole resid into light oil is not economic at the normal price gap between the light and heavy oils. Hence a combination of hydrogenation process with carbon removal process is generally adopted.The heavy solvent deasphalting can selectively remove the asphaltenes and metals contained in resid while providing a large amount of easily convertible deasphalted oil for the down-stream processes.This article refers to the characteristics of heavy solvent deasphalting and its application in sour resid processing, along with various routes for utilization of deoiled asphalt.

Reaction Process of Heavy Hydrocarbons Hydrogenation in Ebullated Bed

The properties and structural changes of unconverted oil(UCO)obtained from ebullated bed hydrogenation at different residue conversion rates were analyzed to clarify the reaction process of heavy components.Meanwhile,the processing routes of UCO,delayed coking,and solvent deasphalting,were investigated.The results showed that with the increase of conversion,the impurity removal rate increased;meanwhile the contents of sulfur and metal in UCO decreased,while the contents of nitrogen and residual carbon increased,and the colloidal stability of UCO became worse.The structural parameters of UCO indicated that the change in molecular structure of heavy oil mainly covered the opening of cycloalkanes ring,hydrogenation saturation of aromatic rings and dealkylation reaction during hydrogenation in the ebullated bed;the aromatic structure was basically unchanged at high conversion,and was mainly due to the ring opening of cycloalkanes and the fracture reaction of alkyl side chains.The coking route of UCO showed that low sulfur petroleum coke with different grades could be prepared by adjusting the conversion in ebullated bed to produce UCOs with different properties.The coke generating coefficient and sulfur transfer coefficient in UCO coking process were higher than those in residue coking.The properties of deasphalted oil(DAO)of UCO were significantly improved and could be used as FCC or hydrocracking feedstock.The DAO yield of UCO feedstock at high conversion was higher,and its sulfur content was lower and CCR value was higher.

Suitability of Sour Crude Processing and Resid Hydrotreating Technologies

This article has analyzed the environment and tasks confronting China's petroleum refining industry, and has referred to principles for selecting the resid processing technologies and viability of various combination technologies for resid processing. Taking into account the actual commercial practice of resid hydrogenation units, this article has also discussed methods for processing high-sulfur inferior crudes as well as the suitability of resid hydrogenation technology.

Heavy Crude Oil Upgrading: Jazmin Crude

The Jazmin crude oil is located at the heart of Middle Magdalena in Colombia. It is heavy and sour crude oil with 43 wt.% of vacuum bottoms. It cannot be processed at the conventional refinery without being mixed with other lighter crudes, and should be upgraded to produce synthetic crude with higher concentration of distillates and lower acidity and carbon content. In this paper eight upgrading alternatives are presented. The alternatives include the processing of the crude, reduced crude and vacuum bottoms of the Jazmin crude oil using the following technologies: Distillation, solvent deasphalting, visbreaking, Delayed Coking, and Hydrotreating. The experiments were conducted at pilot scale, and there were used standard analysis techniques such as ASTM. In this study it was found that Jazmine crude oil and its heavy components produce high distillate yields when they were processed with thermal conversion processes. In addition those processes reduce the products acidity. Within the analyzed scheme the one corresponding to the visbreaking of the crude oil and the Delayed Coking of the vacuum bottoms from the visbreaking is perhaps the most attractive, giving 5.9 wt.% of gas, 78.2 wt.% of distillates and 15.9 wt.% of coke.

Manufacture of High-Quality Bright Stock and Ultra-Viscous White Oil from Xinjiang Heavy Naphthenic Crude Oil

Using a three-stage hydrogenation process, high-quality 150 bright stock (150BS) was produced from light DAO (LDAO, light deasphalted oil), which was obtained from vacuum residue of heavy naphthenic crude oil of Zone No.9 in Xinjiang. The 150BS product, whose viscosity index is greater than 90, is colorless and has good viscosity-temperature characteristics. This product turns out to be an excellent blending component of high-grade engine oil. And with the 150BS as a feed, very high-viscosity white oil was also produced by a further hydrofining step to substantially reduce the amount of polyaromatics contained in the feed.