ISOLATION AND CHARACTERIZATION OF NATURAL SURFACTANTS FROM EXTRA HEAVY CRUDE OILS, ASPHALTENES AND MALTENES - INTERPRETATION OF THEIR INTERFACIAL-TENSION PH BEHAVIOR IN TERMS OF ION-PAIR FORMATION

被引：54

作者：

ACEVEDO, S ^{[1
]}

ESCOBAR, G ^{[1
]}

GUTIERREZ, L ^{[1
]}

RIVAS, H ^{[1
]}

机构：

[1] INTEVEP SA,CARACAS 1070A,VENEZUELA

来源：

FUEL | 1992年 / 71卷 / 06期

关键词：

CRUDE OIL; ASPHALTENE; MALTENE;

D O I：

10.1016/0016-2361(92)90163-I

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Natural surfactants (NS) have been isolated from extra heavy crude oils and from their asphaltene and maltene fractions. The elemental analyses and molecular weight (M(w)) properties and the molecular weight distribution (MWD), as well as the interfacial tension (gamma) behaviour (toluene solutions) with pH have been measured. The NS of crude oils (NSC) and those from asphaltenes (NSA) presented properties similar to those of asphaltenes (high M(w), low H/C ratio, heteroatom content and gamma-pH behaviour) whereas the NS isolated from maltenes (NSM ) resembled neither asphaltenes nor resins. The gamma-pH behaviour of the crude oil systems were not reproduced by their fractions (asphaltenes, maltenes, NSC, NSA or NSM ). A chemical equilibrium, based on ion pairs formed between carboxylic acids and amines, is proposed to account for the observed gamma-pH changes.

引用

页码：619 / 623

页数：5

共 12 条

[1] ASPHALTENES AND RESINS FROM THE ORINOCO BASIN [J].