high pentane(c5), hexane(c6) in gasoline. is it ok?

[Ilia]

Hello! New refinery(Taneko Tatneft) in Russia start to produce 95/98 octane gasoline in 2019 with high pentane(19.77%) and hexane(13.45%). Other refineries still produce with like 2%/1% of pentane and hexane respectively.
Is it gaseous gasoline(petrol)? What are pros and cons for it? Do they use low-cost pentane and hexane to save on costs? or this concentrations are evolution and better for engine nowdays?
I add passport for 95 octane Taneko fuel.

About scientific papers-i found some, also info that pentane and hexane are very low octane-boosters, like 0 and 62 octane respectively.
Also i found that there are some limitations for pentane/hexane in gasoline(<20 and <15 respectively).

 

[Ilia]

p.s. if needed i can make a translation of fuel passport data!

 

[eljefino]

 

[Linctex]

Добро пожаловать!

У вашего Ð´Ð²Ð¸Ð³Ð°Ñ‚ÐµÐ»Ñ ÐµÑÑ‚ÑŒ датчик детонации?

 

[Ilia]

Every modern car has it but i don't have torque like program for Ford or vag scanner for VW.
As I know there are many professionals on this forum that's why i posted this question.

 

[MolaKule]

Gasoline (Petrol) may contain one of more of the following components, and is mainly Naphtha with the following alkanes and aromatics:

Alkanes;

n-Heptane
n-Octane
n-Nonane
n-Decane
n-Undecane
n-Dodecane
n-Tridecane
n-Tetradecane
n-Pentadecane
n-Hexadecane
Cyclohexane
Methyl cyclohexane

Aromatics;

Benzene
Toluene
Ethylbenzene
p-Xylene,m-xylene
o-Xylene
Isopropylbenzene
n-Propylbenzene
p-Isopropyltoluene
4-Ethyl toluene
2-Ethyl toluene
1,3,5-Trimethylbenzene
1,2,4-Trimethylbenzene
1,2,3-Trimethylbenzene
sec-Butylbenzene
n-Butylbenzene
Styrene


In addition, you may find alcohols such as ethanol and or isopropyl, especially in the US.

Octane targets are accomplished by varying the amounts of both the Alkanes and Aromatics.

Mixtures may vary from country to country and from state to state or province.

Gasoline tested in the southern US contained mainly toluene, 2-methylbutane, p-,m-xylene, 1,2,4-trimethyl-benzene and n-butane.

In Canada, one may see toluene, 2-methylbutane, p-,m-xylene, n-pentane and 2-methyl pentane as the main ingredients.

In South Korea, gasoline contained 2-methylbutane, toluene, 2-methylpentane, n-pentane and p-,m-xylene as the main ingredients.

 

[Ilia]

Thank You, MolaKule, for answer. I understand standard compositions of petrol in general.
It is question about difference in petrol composition. 5 refineries use 2%/1% ratio pentane/hexane for premium(95 octane=ron 91) fuel and 1 new refinery begin to use 19/13% pentane/hexane in its composition. Pentane and hexane are made from light naphta and more close to gaseous gas(petrol). Is it true? It will be more MPG-economy? or it's economy of refinery on customers due to less cost of pentane and hexane?
From your post it's ok to use any variant of composition like gas is gas, but compositions are different in this case.

 

[Ilia]

Ok, what gasoline You suppose to use personally- with 19/13% or 2/1% of pentane/hexane in composition?

 

[MolaKule]

I use whatever octane rating the engine requires.

It could be the refinery is changing over to a summer blend, or their feedstocks for one alkane series is more abundant than others.

 

[Ilia]

They use same percentage of pentane/hexane for winter/off-season/summer blends. Probably they have big feedstock of this pentane/hexane.....as i know pentane and hexane are low-cost components.
Any other opinions?

 

[kschachn]

Originally Posted by Ilia
They use same percentage of pentane/hexane for winter/off-season/summer blends. Probably they have big feedstock of this pentane/hexane.....as i know pentane and hexane are low-cost components.
Any other opinions?

So interesting, they use the low molecular weight, high volatility components in equal amounts between summer and winter? C5 and C6 hydrocarbons are cheaper than C8?

 

[Ilia]

some petrol passports with winter/spring type of 95 octane were with like 13%/10%, 15/11%. in general no less then 10%....
all other big refineries use pentane/hexane 2%/1% or 3%/2% maximum....
is it new method of production of petrols or evolution of standard Exxon/Chevron methods of cracking, isomerization and so on...? or vice are versa-low-cost or fraud like way of production?

 

[Ilia]

i found 1 patent with 35% compositions in summary of pentane/hexane in petrol and purposed directly for formula/sport cars or heavy-used SUV's.
https://patents.google.com/patent/RU2478601C1/en
please check
so it's not for civil cars... no info about economy, motor cleanliness due to another purposes(antiknock and stability)