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炼厂干气中碳二组分回收技术概述 被引量:13
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作者 侯效余 张敬升 李东风 《石油石化绿色低碳》 2021年第1期11-18,60,共9页
随着炼化技术的进步,对炼厂干气中碳二等组分的回收利用也越来越受到重视。干气回收是一种增加资源利用率、减少环境污染、提升企业效益的重要手段。文章主要从深冷分离工艺、浅冷油吸收工艺、变压吸附工艺(PSA)以及膜分离工艺和水合物... 随着炼化技术的进步,对炼厂干气中碳二等组分的回收利用也越来越受到重视。干气回收是一种增加资源利用率、减少环境污染、提升企业效益的重要手段。文章主要从深冷分离工艺、浅冷油吸收工艺、变压吸附工艺(PSA)以及膜分离工艺和水合物分离工艺等炼厂干气回收技术的原理出发介绍了各种干气回收技术的特点以及进展。各工艺具有不同的特点,适用的场合也不尽相同,各炼化企业应从干气特点、产品要求等具体情况出发,着重对自身特点进行评估以选择适合的回收工艺。 展开更多
关键词 炼厂干气 碳二组分 回收技术
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GC/MS analyses of fractionated extraction of Shenfu coal with CS2,n-hexane,benzene 被引量:2
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作者 王晓华 魏贤勇 《Journal of Coal Science & Engineering(China)》 2008年第4期672-674,共3页
Shenfu coal was extracted with 0S2, n-hexane, benzene sequentially. The extracts were analyzed with GC/MS. It is presented that group seperation of soluble organic compounds in the coal can be achieved by fractionated... Shenfu coal was extracted with 0S2, n-hexane, benzene sequentially. The extracts were analyzed with GC/MS. It is presented that group seperation of soluble organic compounds in the coal can be achieved by fractionated extraction using different solvents. Main components in CS2 soluble fraction from Shenfu coal are alkyl-substituted arenes. Aliphatic hydrocarbons are overwhelmingly predominant in n-hexane-soluble fraction. Dito tricyclic aramatic hydrocarbons are identified in benzene-soluble fraction. The molecular structures detection of 2, 4, 6-trichlorobenzenamine and 3, 3', 4, 4', 5, 5'-hexachloro-1, 1'- biphenyl and 2-chlorocyclohexanol firstly provide information for existence form of chlorine in coal. 展开更多
关键词 solvent fractionated extraction chemical constituent GC/MS
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Recent advances in fixation of CO_(2) into organic carbamates through multicomponent reaction strategies 被引量:1
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作者 Lu Wang Chaorong Qi +1 位作者 Wenfang Xiong Huanfeng Jiang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第7期1598-1617,共20页
Carbon dioxide(CO_(2)) is the main greenhouse gas and also an ideal C1 feedstock in organic synthesis because it is abundant,nontoxic,nonflammable,and renewable.The synthesis of organic carbamates using CO_(2) as a ph... Carbon dioxide(CO_(2)) is the main greenhouse gas and also an ideal C1 feedstock in organic synthesis because it is abundant,nontoxic,nonflammable,and renewable.The synthesis of organic carbamates using CO_(2) as a phosgene alternative has attracted extensive attention because of the importance of carbamates in organic synthesis and in the pharmaceutical and agrochemical industries.In recent decades,many multicomponent reaction strategies have been designed for constructing different types of organic carbamate molecules.Most of these methods rely on the in situ generation of carbamate anions from CO_(2) and amines,followed by reactions with other coupling partners.Synthetic strategies for acyclic carbamates include nucleophile‐electrophile coupling,nucleo‐phile‐nucleophile oxidative coupling,difunctionalization of unsaturated hydrocarbons,and C–H bond functionalization.Strategies for the synthesizing cyclic carbamates include carboxylative cyclization of in situ‐generated unsaturated amines and difunctionalization of unsaturated amines with CO_(2) and other electrophilic reagents.This review summarizes the recent advances in the synthesis of organic carbamates from CO_(2) using different multicomponent reaction strategies.Future perspectives and challenges in the incorporation of CO_(2) into carbamates are also presented. 展开更多
关键词 Carbon dioxide AMINES CARBAMATE Multicomponent reaction Synthetic strategy
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Soil Organic Carbon and Its Fractions Across Vegetation Types:Effects of Soil Mineral Surface Area and Microaggregates 被引量:4
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作者 WU Qing-Biao WANG Xiao-Ke OUYANG Zhi-Yun 《Pedosphere》 SCIE CAS CSCD 2009年第2期258-264,共7页
Soil organic carbon(SOC)can act as a sink or source of atmospheric carbon dioxide;therefore,it is important to understand the amount and composition of SOC in terrestrial ecosystems,the spatial variation in SOC,and th... Soil organic carbon(SOC)can act as a sink or source of atmospheric carbon dioxide;therefore,it is important to understand the amount and composition of SOC in terrestrial ecosystems,the spatial variation in SOC,and the underlying mechanisms that stabilize SOC.In this study,density fractionation and acid hydrolysis were used to assess the spatial variation in SOC,the heavy fraction of organic carbon(HFOC),and the resistant organic carbon(ROC)in soils of the southern Hulun Buir region,northeastern China,and to identify the major factors that contribute to this variation.The results showed that as the contents of clay and silt particles(0–50μm)increased,both methylene blue(MB)adsorption by soil minerals and microaggregate contents increased in the 0–20 and 20–40 cm soil layers(P<0.05).Although varying with vegetation types,SOC,HFOC,and ROC contents increased significantly with the content of clay and silt particles, MB adsorption by soil minerals,and microaggregate content(P<0.05),suggesting that soil texture,the MB adsorption by soil minerals,and microaggregate abundance might be important factors influencing the spatial heterogeneity of carbon contents in soils of the southern Hulun Buir region. 展开更多
关键词 carbon fractions MICROAGGREGATES soil mineral surface area soil organic carbon VEGETATION
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Component Exergy Analysis of Solar Powered Transcritical CO_2 Rankine Cycle System 被引量:6
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作者 Xiaojuan Li Xinrong Zhang 《Journal of Thermal Science》 SCIE EI CAS CSCD 2011年第3期195-200,共6页
In this paper,exergy analysis method is developed to assess a Rankine cycle system,by using supercritical CO2 as working fluid and powered by solar energy.The proposed system consists of evacuated solar collectors,thr... In this paper,exergy analysis method is developed to assess a Rankine cycle system,by using supercritical CO2 as working fluid and powered by solar energy.The proposed system consists of evacuated solar collectors,throttling valve,high-temperature heat exchanger,low-temperature heat exchanger,and feed pump.The system is designed for utilize evacuated solar collectors to convert solar energy into mechanical energy and hence electricity.In order to investigate and estimate exergy performance of this system,the energy,entropy,exergy balances are developed for the components.The exergy destructions and exergy efficiency values of the system components are also determined.The results indicate that solar collector and high temperature heat exchanger which have low exergy efficiencies contribute the largest share to system irreversibility and should be the optimization design focus to improve system exergy effectiveness.Further,exergy analysis is a useful tool in this regard as it permits the performance of each process to be assessed and losses to be quantified.Exergy analysis results can be used in design,optimization,and improvement efforts. 展开更多
关键词 Transcritical CO2 Rankine cycle Solar energy Solar collector Component exergy analysis
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