STRUCTURAL TRANSFORMATIONS OF HEAVY OIL RESINS FROM THE NURLAT OILFIELD UNDER THERMAL ACTION

IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Chemistry for Sustainable Development Pub Date : 2024-06-14 DOI:10.15372/csd2024540
N. Gerasimova, T. V. Cheshkova, R. S. Min, T. A. Sagachenko
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Abstract

Resins extracted from heavy high-viscous oil of the Nurlat oilfield were investigated. The composition of fragments bound through sulphide and ether bridges in the molecules of initial resins and the liquid products of their conversion at 450 °C under the conditions of laboratory experiment was studied using a set of physicochemical methods (IR spectroscopy, UV spectroscopy, gas chromatography - mass spectrometry, chemical destruction). It is shown that the fragments undergoing destruction are mainly those bound in the structure of the initial sample through the least thermally stable functional groups of esters and aliphatic sulphides. Sulphur- and ether-bound compounds in the structure of both resin samples are represented by n-alkanes, n-alkylcyclopentanes, n-alkylcyclohexanes and hopanes. The presence of nickel porphyrins was established among the sulphur-bound compounds. It is the molecular composition of bound n-alkanes that changes most noticeably during thermolysis. Ether bond cleavage in the molecules of secondary resins leads to the formation of products containing mono- and dibromides of alkyl biphenyls. This fact provides evidence that these aromatic compounds are present in resins in the form of fragments bound with other structural fragments through one and two ether bridges.
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努尔拉特油田重油树脂在热作用下的结构转变
对从努尔拉特油田重质高粘度石油中提取的树脂进行了研究。使用一套物理化学方法(红外光谱法、紫外光谱法、气相色谱-质谱法、化学破坏法)研究了在实验室实验条件下,通过硫化桥和醚桥结合在初始树脂分子中的碎片及其在 450 °C 下转化的液体产物的组成。结果表明,发生破坏的碎片主要是那些通过酯类和脂肪族硫化物等热稳定性最差的官能团与初始样品结构结合的碎片。两种树脂样品结构中与硫和醚结合的化合物包括正烷烃、正烷基环戊烷、正烷基环己烷和合烷。在硫结合化合物中发现了卟啉镍。热解过程中变化最明显的是结合正烷烃的分子组成。二次树脂分子中的醚键裂解会形成含有烷基联苯单溴化物和二溴化物的产物。这一事实证明,这些芳香族化合物是以通过一个和两个醚桥与其他结构片段结合的片段形式存在于树脂中的。
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来源期刊
Chemistry for Sustainable Development
Chemistry for Sustainable Development CHEMISTRY, MULTIDISCIPLINARY-
自引率
25.00%
发文量
52
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