With the increasing attention to environmental protection, reducing diesel exhaust pollution
and producing high quality clean diesel fuel have become the development direction of modern
oil refining industry.Studies have shown that sulphur is the most harmful element to increase
HC and CO particulates (PM) in diesel engine emissions, so reducing sulphur content in diesel
is particularly important to improve air pollution.Many countries and regions in the world have
already reduced the sulfur content of diesel to 10-500 PPM to reduce the emission of diesel
engines.Diesel engine compared with gasoline engine, diesel engine has the advantages of high
efficiency, durability, clean, low maintenance cost, so from the perspective of environmental
protection and energy saving, diesel engine is more and more favored and increased
application.In diesel engine as a fuel and as lubricant oil transfer pump and high pressure oil
pump, if the diesel fuel lubricity is bad, will not be able to provide reliable lubrication for
the pump, will lead to the precision components of engine excessive wear, matching accuracy
decline, diesel fuel atomization, engine power insufficient or idle instability and other
issues, which reduces the engine life, serious when can cause oil pump oil.
Hard hydrogenation process due to the widely adopted as low sulfur and low aromatic
hydrocarbon, high cetane number, light fraction of clean diesel, a large number of natural
oxygen, nitrogen compounds, and polycyclic polarity, double ring aromatic hydrocarbons, such as
wear-resistant material be removed, the diesel lubrication performance is greatly reduced, use
of low sulfur and ultra-low sulphur diesel engine oil pump wear failure problems, warning
people to the attention of the diesel fuel lubricity.
There are two main measures to improve the lubricity of low sulfur diesel: one is to adjust the
process operation and make the material concentration of the transformable lubricity in the
feed to the maximum;The second is to use additives with lubricity.Due to the limited operating
conditions of oil refineries, it is relatively economical to use lubricating additives to meet
the lubricating requirement of low sulfur diesel.Lubricity additive namely diesel oil lubricity
modifier is also called diesel antiwear agent, mainly is to add some polar compounds, under the
premise of not affecting other performance of diesel oil, can compensate for the loss of polar
substances that play lubrication role in diesel oil caused by hydrotreating, to improve the
lubricity of low sulfur diesel.It is simple, economical and effective to add diesel lubricating
modifier to diesel oil.Since 1990s, this method has been widely used in many countries in the
world.At present, the main diesel additives used in China are fatty acids and their esters.
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