7 replies to this topic

[CHEMSTRONG]

Dear Sir,

 

For a Refinery Diesel, we always say that Diesel Fuel should have Recovery at 360 DEg C i.e E360 as minimum 95 percent Volume Distilled.  Why we want to keep minimum and maximum limits on E360 property of Diesel .What will happen if we exceed these limits on minimum and maximum sides ? Can you please explain ?

 

Thanks 

Regards

[Bobby Strain]

You have to meet the sales specification.

 

Bobby

[SilverShaded]

A maximum of 360C at D86 95% is the maximum value, it can be lower than that but not higher.  The reason refiners typically maximise it to 360 is simply due to economics, leaving valueable diesel in the Heavy Atmospheric Gasoil cut is generally uneconomic as that has lower value.

[gegio1960]

the mai reason is for environmental scopes.

if your 95 astm point goes above 360°C you'll have more heavier component in your diesel.

these heavier components are the main responsibles for the increased presence of particulates (pm10. pm2.5 etc) in the flue gases coming from the combustion of the diesel.

for instance, in other specs this parameter is limited at 340°C in order to obtain an extra reduction of particulate matter

[Napo]

Chemstrong,

 

You can review ASTM D-975: Standard Specification for Diesel Fuel Oil, for reference.

 

Many countries takes this standard for reference with littles changes, but you need respect the normative of your country.

 

The standard describe the general properties of diesel in agreement between the purcharser and provider "all of them".

 

You need respect all of this.

 

Napo.

[Nasir410]

More reasons of controlling the 95 % distillation point of diesel can be found here;

https://thepetrosolu...point-at-360-c/

[StealthProg]

Ultimately it's due to things like particulate emmisions and other environmental considerations.  Refinery product specifcations are usually a combination of whats best for the engine given local conditions and whats best for the people breathing in the engine fumes.  The light end of diesel is usually limited by flash point and the amount of kerosine you can blend in and the heavy end by emission considerations.  The refinery usually tries to maximise kerosine/Jet or Diesel as these are typically the valuable products.  If your maximising diesel you drop kerosine into the diesel on the crude unit until you meet a flash point spec.  If your maximising kerosine you draw more kerosine/less diesel on the CDU until you meet the kerosine freeze point spec.  It's the job of the linear program, such as PIMS, to find the optimum, within whatever product specs are relevant.

Edited by StealthProg, 09 August 2022 - 04:58 AM.

[hidayatfarizi]

The distillation characteristics illustrate how the fuel evaporates when it is sprayed into the combustion chamber of a diesel engine. Some fractions with low boiling temperatures are needed for engine start-up, while fractions with boiling temperatures that are too high may not combust completely and result in engine deposits and anincrease in tailpipe emissions. A typical boiling range of a European summer grade diesel fuel is from~180 °C (356 °F) to ~360 °C (680 °F).