温度对原油四组分高压热解性能的影响

在30 MPa压力下对塔里木原油四组分进行封闭体系的热解实验,通过气相色谱(GC)和气相色谱/质谱(GC/MS)分别对原油四组分热解反应的气体产物及饱和分热解过程的液态产物进行分析.结果表明:原油四组分热解气体产物中C1组分产率明显高于C2~C5组分,气体产物中C1~C2组分的产率及气体总产率随热解温度升高而增加;在温度高于450℃时,四组分总产气率的大小顺序为:沥青质饱和分芳香分胶质.随热解温度升高,饱和分中的主要组分C12~C18的反应程度加剧.在410℃时,饱和分热解以裂解反应为主,在大于490℃时,裂解和缩合反应程度都在增加,导致气相产物的产率提高及液相产物中主要组分向大分子烃类转移;且温度升高,液态产物分布的离散程度增加.

The Effects of Temperatures on High-pressure Pyrolysis Characteristics of Crude Oil Four Components

The compositions and contents of the gas products produced by pyrolysis reactions of four components separated from the Tarim crude oil and that of liquid products from saturates of Tarim crude oil under30 MPa and different temperatures were analyzed by GC and GC/MS respectively.The results showed that contents of C1 component in gas products obtained from pyrolysis of the four components were significantly higher than that of C2 to C5components,and the total gas yields as well as the gas yields of the C1~C2components increased with the increase of the pyrolysis temperatures.The total gas yield of the four components was in the order:asphaltene>saturates>aromatics>resin,as the temperature above 450℃ was adopted.The pyrolysis reaction degree of the main component C12~C18in saturates increased with the increase of temperature.At410 ℃,the pyrolysis of saturates was mainly cracking reaction,and the degrees of cracking and condensation reactions increased at above 490℃,which led to the increase of gas yields as well as the main component of the liquid products to the large molecular hydrocarbon.Discrete degree of component distribution in liquid products augmented with the increase of pyrolysis temperature.