泰州AH-90沥青氧化动力学及反应机制
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摘要
用间歇式氧化反应釜,在温度为200,220和240℃,风量为150 L/(kg.h)条件下对沥青进行氧化试验。对氧化沥青样品进行软化点和红外光谱测定,将软化点与反应时间用Lockwood模型进行拟合,得到氧化沥青软化点与反应时间的关系;对氧化沥青样品与原料沥青进行红外光谱图的对比分析。结果表明:氧化沥青软化点与反应时间遵循总包一级动力学规律;氧化沥青样品在波数为1 698.1 cm-1处羰基吸收峰面积明显增加,且随反应时间的增加而增加;沥青氧化属于自氧化反应,在反应过程中生成氢过氧化物引发剂;氢过氧化物的裂解生成烷氧自由基,烷氧自由基碎裂生成羰基化合物。
With the air flow of 150 L/(kg·h),asphalt was oxidated in the batch oxidation reactor at 200 ℃,220℃ and 240 ℃ respectively.The softening point and infrared spectra of the oxidated asphalt were tested.The softening point and reaction time were fitted by means of Lockwood model,and the relation of softening point and reaction time was obtained.The infrared spectra of the oxidated asphalt and the material asphalt were compared.The results show that the relation of softening point and reaction time follows the laws of overall first order kinetics.The area of oxidated asphalt carbonyl absorption peak increases greatly when the wavenumber equals 1 698.1 cm-1,and increases with reaction time.The mechanism of asphalt oxidation belongs to self-oxidation.The initiator of hydroperoxide is produced in process of reaction.The hydroperoxide decomposes and produces the alkoxy free radical.Finaly,the alkoxy free radical comes into being the carbonyl compound.
With the air flow of 150 L/(kg·h),asphalt was oxidated in the batch oxidation reactor at 200 ℃,220℃ and 240 ℃ respectively.The softening point and infrared spectra of the oxidated asphalt were tested.The softening point and reaction time were fitted by means of Lockwood model,and the relation of softening point and reaction time was obtained.The infrared spectra of the oxidated asphalt and the material asphalt were compared.The results show that the relation of softening point and reaction time follows the laws of overall first order kinetics.The area of oxidated asphalt carbonyl absorption peak increases greatly when the wavenumber equals 1 698.1 cm-1,and increases with reaction time.The mechanism of asphalt oxidation belongs to self-oxidation.The initiator of hydroperoxide is produced in process of reaction.The hydroperoxide decomposes and produces the alkoxy free radical.Finaly,the alkoxy free radical comes into being the carbonyl compound.
引文
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[2]魏毅,杨鹏,刘道胜,等.调和-氧化法制备重交道路沥青[J].抚顺石油学院学报,2002,22(4):12-15.WEI Yi,YANG Peng,LIU Dao-sheng,et al.Prepara-tion of heavy paving asphalt by blending-oxidizing method[J].Journal of Fushun Petroleum Institute,2002,22(4):12-15.
[3]于旭霞,李杰,王利卿.渣油氧化制取10#建筑沥青的研究[J].辽宁化工,2005,34(8):339-341.YU Xu-xia,LI Jie,WANG Li-qing.Preparation of 10#asphalt by oxidizing the residual fluid[J].LiaoningChemical Industry,2005,34(8):339-341.
[4]冯敏哿,郭皎河,杨德斌,等.渤海36-1原油高等级道路沥青的开发及其温度性质的初步评价[J].石油炼制与化工,2000,31(10):315-319.FENG Min-ke,GUO Jiao-he,YANG De-bin,et al.Preparation of high grade road asphalt from Bohai crudeand preliminary evaluation of its temperature performace[J].Petroleum Processing and Petrochemicals,2000,31(10):315-319.
[5]郭庆举,廖克俭,魏毅,等.氧化-调和沥青感温性能的初步考察[J].化工科技,2005,13(2):15-18.GUO Qing-ju,LIAO Ke-jian,WEI Yi,et al.Preliminarystudy on the temperature susceptibility of oxidation&blend asphalt[J].Science&Technology in Chemical In-dustry,2005,13(2):15-18.
[6]李真,刘瑾.催化氧化石油沥青氧化机理的探讨[J].安徽建筑工业学院学报:自然科学版,2000(4):48-51.LI Zhen,LIUJin.The exploration of oxidized mechanismof catalytic oxidation modified asphalt[J].Journal ofAnhui Institute of Architecture,2000(4):48-51.
[7]LOCKWOOD D C.Determine asphalt blowing kinetics[J].Petroleum Refiner,1959,28(3):197-200.
[8]PUZINAUSKAS V P.Properties of asphalt cements[J].AAPT,1979(42):62-98.
[9]穆光照.自由基反应[M].北京:高等教育出版社,1985:127-130.
[10]冯锋,孟双明.高等有机化学[M].北京:地震出版社,2000:428-430.
[11]复旦大学高分子科学系.高分子化学[M].上海:复旦大学出版社,1995:111-114.
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