Influence of physicochemical properties of depressor additives on their performance in diesel fuels

N. Yakovlev, S. G. Agaev
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Abstract

The work investigates the influence of the physicochemical properties of depressor additives on their performance in diesel fuels of various chemical and fractional compositions. Heavy, summer and marine diesel fuels were used. The following physicochemical properties of fuels were determined: cloud point, freezing point, density, viscosity, fraction composition and hydrocarbon content that formed a complex with carbamide. The content and molar mass distribution of individual n-alkanes in diesel fuels were determined. The following foreign depressant-dispersing additives were used: Dodiflow with codes 4971, 5416, 5817 and 7118, Keroflux with codes 3501, 5696a and Ofi-8863. Their active agents were isolated from the commercial additives by dialysis using semi-permeable rubber membranes. The dropping point of the active agents, their intrinsic viscosity in kerosene and the refractive index at 100 °C were identified. The content of vinyl acetate components and the degree of branching of aliphatic radicals of depressor additives were determined using infrared spectroscopy of the active agents. The relationship between the physicochemical properties of depressor-dispersing additives and their performance in diesel fuels was established. Additives characterised by a relatively high melting point, an average intrinsic viscosity and low branching of aliphatic compounds in the polymer structure exhibit the best performance in fuels. The consumption of additives to achieve the maximum depression of freezing point decreases with the transition from summer to marine fuel and further to heavy diesel fuel. A complex tкп / СВА value, comprising the ratio of the dropping points tкп and the content of vinyl acetate components in the additives, was proposed as a means of predicting the efficiency of depressant additives СВА. In the range of tкп / СВА values of 3.02–4.00 the additives have universal depressant properties. A correlation was established between the refractive index nD100 of additives and the complex value tкп / СВА (R2 = 0.975).
柴油中抑制剂添加剂理化性质对其性能的影响
本文研究了在不同化学成分和分数成分的柴油中,抑制剂添加剂的理化性质对其性能的影响。使用重柴油、夏季柴油和船用柴油。测定了燃料的以下物理化学性质:浊点、凝固点、密度、粘度、馏分组成和与尿素形成络合物的碳氢化合物含量。测定了柴油中单体正构烷烃的含量和摩尔质量分布。使用的国外抑制剂分散添加剂有:编号为4971、5416、5817和7118的Dodiflow,编号为3501、5696a和Ofi-8863的kerokflux。采用半透橡胶膜透析法从工业添加剂中分离出活性物质。测定了活性剂的落点、在煤油中的特性粘度和在100℃时的折射率。采用红外光谱法测定了抑制剂添加剂中乙酸乙烯酯组分的含量和脂肪族自由基的支化程度。建立了降阻分散添加剂的理化性质与其在柴油中的性能之间的关系。具有较高熔点、平均固有粘度和低支化脂肪族化合物的聚合物结构的添加剂在燃料中表现出最好的性能。从夏季燃料过渡到船用燃料,再过渡到重柴油燃料,实现冰点最大降低的添加剂消耗量也随之减少。提出了一个复杂的tкп / СВА值,由降点的比值tкп与添加剂中醋酸乙烯组分的含量组成,作为预测抑制剂添加剂效率СВА的手段。在tкп / СВА值为3.02-4.00的范围内,添加剂具有普遍的抑制性能。添加剂的折射率nD100与复值tкп / СВА之间存在相关性(R2 = 0.975)。
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