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Dissolution of Expanded Polystyrene in cycloalkane Solutions

Open Journal of Applied Sciences 2018年第10期8卷 465-471页

作者： Shiying Tao Boyang Li Hui Huang Faculty of Science and Engineering The University of Nottingham Ningbo Ningbo China Ningbo Nottingham New Materials Institute Ltd. Ningbo China School of Materials and Chemical Engineering Ningbo University of Technology Ningbo China

Feasibility of dissolution and utilization of expanded polystyrene in cycloalkane solutions was investigated in this work. The dissolution process of expanded polystyrene in several cycloalkane solutions decalin, cyclohexane and methyl cyclohexane was studied. The effect of dissolution temperature, mechanical agitation, ultrasonic wave and stirring rate was studied under optimized conditions. Mass transfer coefficients were fitted. The results showed that the dissolution rate of expanded polystyrene in different cycloalkane solutions was ranked as decalin > methyl cyclohexane > cyclohexane;higher dissolution temperature and faster stirring rate could speed up the dissolution of expanded polystyrene;the effect of mechanical agitation was superior to ultrasonic condition;the solubility of top face was better than side face and under face.

关键词： Expanded Polystyrene cycloalkane Dissolution Mass Transfer Coefficient

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Enumeration of Stereoisomers of Chiral and Achiral Derivatives of Monocyclic cycloalkanes Having Heteromorphous Alkyl Substituents with Distinct Length <i>k</i>

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Computational Chemistry 2019年第3期7卷 72-93页

作者： Alphonse Emadak Ibrahim Mbouombouo Ndassa Beauregard Thomas Makon Issofa Patouossa Robert Martin Nemba Laboratory of Applied Physical and Analytical Chemistry Department of Inorganic Chemistry Faculty of Sciences University of Yaounde 1 Yaounde Cameroon Laboratory of Chemistry Department of Chemistry High Teacher Training College University of Yaounde 1 Yaounde Cameroon

A combinatorial method based on the determination of the averaged weight of permutations controlling the chirality/achirality fittingness of 2n substitution sites of the monocyclic cycloalkane allows to obtain generalized functional equations for direct enumeration of enantiomers pairs and achiral skeletons of any derivatives of monocyclic cycloalkanes having heteromorphic alkyl substituents with the distinct length k with the empirical formula , wherein at least two alkyl groups??of the distinct size ?each. ?is the number of alkyl radicals ?of the system??verifying the relation . The integer sequences of enantiomer pairs and achiral skeletons are given for substituted derivatives of monocyclic cycloalkane for n = 3, 4 and k = 3, 4, 5. The composite stereoisomerism of this particular compound is also highlighted.

关键词： Enumeration Stereoisomer Chirality Achirality Monocyclic cycloalkane Order of Alkyl Trees Polyalkylation

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Geochemical characteristics and origin of light hydrocarbons in biogenic gas

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Science China Earth Sciences 2010年第6期53卷 832-843页

作者： HU GuoYi LUO Xia LI ZhiSheng ZHANG Ying YANG Chun LI Jin NI YunYan TAO XiaoWan Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China China Petroleum University Beijing 102249China Research Institute of Petroleum Exploration&Development(Langfang) PetroChinaLangfang 065007China

The light hydrocarbon geochemical characteristics of biogenic gases from Sebei 1 gas field in the Qaidam Basin, Baoshan gas field in the Baoshan Basin and Alaxin gas field, Puqian gas pool, Aonan gas pool in the Songliao Basin are studied and the origin is discussed based on the composition and isotope data of gases. The isoalkane contents among light hydrocarbons in natural gas show a negative relationship with δ13C1 values. The isoalkane contents of the gases with δ13C1 values of less than ?60‰ are also high with more than 40% among light hydrocarbons in Sebei 1 gas field and Puqian gas pool. Moreover, the 2,2-dimethylbutane and 2-methylpentane, mainly sourced from bacteria, have predominance among isoalkanes, which suggests that light hydrocarbons in biogenic gases from these gas fields or pools were probably generated by microbial action. However, the cycloalkane contents among light hydrocarbons in biogenic gas are related to δ13C1 values positively. In Alaxin gas field and Aonan gas pool, where δ13C1 values of biogenic gases are less than ?60‰, the average contents of cycloalkane are higher than 44%. Light hydrocarbons among biogenic gases from these gas fields were probably generated by catalysis. The isoalkane and cycloalkane contents among light hydrocarbons from biogenic gases in the Baoshan gas field are both high, which might be generated by these two actions. The results show that the data of light hydrocarbons in biogenic gas can provide important information for understanding the generation mechanisms of light hydrocarbons during geological evolution and identifying biogenic gas and low mature gas.

关键词： biogenic gas light hydrocarbon isoalkane cycloalkane microbial action catalysis

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