Storage and transport stability of Venezuela visbreaking blended oil

doi:10.16085/j.issn.1000-6613.2015.08.018

Abstract

Abstract: In order to choose a suitable method for ultra-low temperature refrigeration system from two-staged compression and cascade compression, the two refrigeration systems' technical characteristics were analyzed comparatively using theoretical calculations of two-stage and cascade refrigeration system. Both theoretical displacement and theoretical coefficient of the two systems were compared in the economic aspect. Results indicated that compared to two-stage system, compression ratio and exhaust temperature of cascade system were lower and suction pressure and cooling coefficient were higher. At condensing temperature 40℃ and evaporation temperature -65℃, the energy consumption reduction of cascade system can reach to 15.13%, indicating that the performance of cascade system could be better in the ultra-low temperature condition.

Key words: storage stability, visbreaking blended oil, viscosity, asphaltene, petroleum

摘要： 通过考察委内瑞拉常渣减黏调和油黏度、密度、残炭和组成的变化,研究了调和油的长期储存稳定性。通过酸值、胶质和沥青质的结构变化,研究了影响调和油长期储存稳定性的因素。结果表明,不同反应条件下的调和油上下层的黏度、密度和残炭差异不显著,基本相同,调和油没有发生分层现象,长期储存稳定性较好,满足船运要求。随着反应苛刻度和储存时间的增加,胶质/沥青质之比减小,调和油的稳定性下降。溶解在调和油中的微量氧与调和油中的自由基和烯烃发生反应,使得酸值增加。储存过程中胶质和沥青质均发生了缩合,不同反应苛刻度下,4个减黏调和油的胶质结构差异并不大,但420℃/30min调和油沥青质的缩合较明显。氧化反应和胶质、沥青质的缩合使得调和油的长期储存稳定性下降。

关键词: 储存稳定性, 减黏调和油, 黏度, 沥青质, 石油

CLC Number:

TE622.5

ZHANG Na. Storage and transport stability of Venezuela visbreaking blended oil[J]. Chemical Industry and Engineering Progree, 2015, 34(08): 3019-3026,3117.

张娜. 委内瑞拉减黏调和油的储存输运稳定性[J]. 化工进展, 2015, 34(08): 3019-3026,3117.

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