Deep Insights into Heavy Oil Upgrading Using Supercritical Water by a Comprehensive Analysis of GC, GC–MS, NMR, and SEM–EDX with the Aid of EPR as a Complementary Technical Analysis | Zendy

Richard Djimasbe | Zendy; Mikhail A. Varfolomeev | Zendy; Ameen A. AlMuntaser | Zendy; Chengdong Yuan | Zendy; Muneer A. Suwaid | Zendy; Dmitriy A. Feoktistov | Zendy; Ilfat Z. Rakhmatullin | Zendy; Aleksei A. Milovankin | Zendy; Fadis F. Murzakhanov | Zendy; В. И. Морозов | Zendy; Marat Gafurov | Zendy; Abdolreza Farhadian | Zendy; Rustam R. Davletshin | Zendy

Open Access

Deep Insights into Heavy Oil Upgrading Using Supercritical Water by a Comprehensive Analysis of GC, GC–MS, NMR, and SEM–EDX with the Aid of EPR as a Complementary Technical Analysis

Author(s) -

Richard Djimasbe,

Mikhail A. Varfolomeev,

Ameen A. AlMuntaser,

Chengdong Yuan,

Muneer A. Suwaid,

Dmitriy A. Feoktistov,

Ilfat Z. Rakhmatullin,

Aleksei A. Milovankin,

Fadis F. Murzakhanov,

В. И. Морозов,

Marat Gafurov,

Abdolreza Farhadian,

Rustam R. Davletshin

Publication year - 2020

Publication title -

acs omega

Language(s) - English

Resource type - Journals

ISSN - 2470-1343

DOI - 10.1021/acsomega.0c03974

Subject(s) - electron paramagnetic resonance , supercritical fluid , chemistry , paramagnetism , relaxation (psychology) , analytical chemistry (journal) , materials science , nuclear magnetic resonance , environmental chemistry , organic chemistry , psychology , social psychology , physics , quantum mechanics

Upgrading of heavy oil in supercritical water (SCW) was analyzed by a comprehensive analysis of GC, GC-MS, NMR, and SEM-EDX with the aid of electron paramagnetic resonance (EPR) as a complementary technical analysis. The significant changes in the physical properties and chemical compositions reveal the effectiveness of heavy oil upgrading by SCW. Especially, changes of intensities of conventional EPR signals from free radicals (FRs) and paramagnetic vanadyl complexes (VO 2+ ) with SCW treatment were noticed, and they were explained, respectively, to understand sulfur removal mechanism (by FR intensity and environment destruction) and metal removal mechanism (by VO 2+ complexes' transformation). For the first time, it was shown that electronic relaxation times extracted from the pulsed EPR measurements can serve as sensitive parameters of SCW treatment. The results confirm that EPR can be used as a complementary tool for analyzing heavy oil upgrading in SCW, even for the online monitoring of oilfield upgrading.

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