瑪瑞常壓渣油反應前后重質組分含硫結構變化研究
發(fā)布時間:2018-12-07 16:39
【摘要】:在渣油加工過程中,渣油分子中不同含硫官能團由于其化學結構和周圍環(huán)境不同,在反應過程中轉化行為不同,因此,研究不同反應前后渣油中含硫結構的形態(tài)和含量變化,可以指導渣油加工工藝優(yōu)化和硫元素的有效脫除。為了確證瀝青質中+6價硫的形態(tài),利用濃鹽酸或者乙醇萃取的方法對瑪瑞常壓渣油臨氮反應產(chǎn)物、加氫反應產(chǎn)物和沙輕減渣加氫反應產(chǎn)物進行處理,采用氯化鋇滴定的方法檢驗洗出的溶液中是否含有硫酸鹽,結果表明瑪瑞常渣臨氮反應的膠質和瀝青質中均觀測不到硫酸鹽,即所研究瀝青質中+6價硫為有機硫。以瑪瑞常壓渣油(MRAR)為原料,在395℃下進行臨氮熱反應,反應時間分別為30 min、60 min、90 min、120 min、150 min,對不同反應時間的產(chǎn)物進行SARA四組分分離,分別測定組分偶極矩以表征極性,利用1H-NMR表征各組分分子平均結構參數(shù)、分析分子的締合性質,利用X射線吸收近邊結構譜(XANES)分析膠質和瀝青質中不同含硫結構的形態(tài)和相對含量,分析結果表明,膠質和瀝青質中含硫結構的主要存在形式為還原態(tài)的噻吩,此外,以中間態(tài)的亞砜、砜和氧化態(tài)的硫酸酯形式存在;含硫結構的形態(tài)和含量與重質組分的極性、締合性關系不大;對重質組分的極性和體系的膠體穩(wěn)定性進行研究,結果表明,膠質和瀝青質的偶極矩差異越大,二者的膠溶能力越差,體系的膠體穩(wěn)定性也越差;此外,體系中四組分含量和重質組分的分子結構參數(shù)也對膠體穩(wěn)定性有影響。對瑪瑞常壓渣油和沙輕減壓渣油加氫反應樣品進行分析,加氫后樣品膠質的縮合度增大,不同渣油樣品瀝青質的變化情況不一致。加氫反應樣品中各含硫結構的相對含量略有變化,絕對含量均減小,表明組分發(fā)生了加氫脫硫反應,但脫硫選擇性不明顯,斎鸪TR氮反應與加氫反應中各含硫結構的變化規(guī)律明顯不一致,表明渣油臨氮反應和加氫反應中雖然都發(fā)生了脫硫反應,但含硫結構發(fā)生的反應不同。
[Abstract]:In the process of residue processing, different sulfur functional groups in residue molecules have different transformation behaviors in the reaction process because of their different chemical structure and surrounding environment. Therefore, the morphology and content changes of sulfur containing structures in residue before and after different reactions are studied. It can guide the optimization of residue processing process and the effective removal of sulfur elements. In order to confirm the form of hexavalent sulfur in asphaltene, concentrated hydrochloric acid or ethanol extraction was used to treat the products of atmospheric residue nitrogen reaction, hydrogenation reaction products and sand light slags hydrogenation products. The method of barium chloride titration was used to test whether there was sulfate in the washed solution. The results showed that sulfate was not observed in the colloid and asphaltene of the reaction of Mari constant residue, that is, the hexavalent sulfur in the asphaltene was organic sulfur. Under the condition of 395 鈩,
本文編號:2367475
[Abstract]:In the process of residue processing, different sulfur functional groups in residue molecules have different transformation behaviors in the reaction process because of their different chemical structure and surrounding environment. Therefore, the morphology and content changes of sulfur containing structures in residue before and after different reactions are studied. It can guide the optimization of residue processing process and the effective removal of sulfur elements. In order to confirm the form of hexavalent sulfur in asphaltene, concentrated hydrochloric acid or ethanol extraction was used to treat the products of atmospheric residue nitrogen reaction, hydrogenation reaction products and sand light slags hydrogenation products. The method of barium chloride titration was used to test whether there was sulfate in the washed solution. The results showed that sulfate was not observed in the colloid and asphaltene of the reaction of Mari constant residue, that is, the hexavalent sulfur in the asphaltene was organic sulfur. Under the condition of 395 鈩,
本文編號:2367475
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