8 replies to this topic

[Tolinorton]

Dear,

 

Could you please tell me how much C₃ (expressed in mol% and mass%) should contain LPG for Vehicles.

 

By the way does this hydrocarbon composition is adequate for LPG for Vehicles:

 

Hydrocarbon composition       mol%          mass%          

                    C1                        0.0               0.0

                    C2                        0,008           0,05

                    C3                        47,72           40,66

                    C4                        52,05           59,08

                    C5                        0,15             0,21

          1,2 butadiene                 0.0              0.0

          1,3 butadiene                 0,02            0,02

 

The LPG was tested according to EN ISO 27941

 

 

Respectfully

 

Chemtoli

[Bobby Strain]

I believe that almost all vehicles from cars to lawn mowers are designed to use propane, not LPG of mixed composition.

 

Bobby

[PingPong]

LPG has to meet the specifications applicable to your country, so find that out first.

 

C3/C4 mix ratio is to be such that it meets the minimum required Motor Octane Number, and such that the vapor pressure falls within the range mentioned in the applicable specification..

 

Further there are usually limits for C5⁺ content, dienes content, sulfur content, H₂S content, residue after vaporization, odour, et cetera.

Edited by PingPong, 17 July 2014 - 11:07 AM.

[Tolinorton]

Dear PingPong,

 

Please attached find specification for LPG for Vehicle applicable in my country.

 

 

Based on hydrocarbon composition which I presented earlier is this LPG adequate for Vehicles.

 

 

 

Thank you very much for the previous explanation 

 

 

 

 

Attached Files

•  LPG for Vehicles.pdf   72.72KB   21 downloads

[PingPong]

You need to specify C3 breakdown. How much of that is propane, and how much is propylene?

 

You need to specify C4 breakdown. How much of that is isobutane, n-butane, isobutylene, 1-butene, and 2-butene?

[Tolinorton]

Dear Ping Pong,

 

Sorry if I'm bothering you with too many questions but for the end I need to know your opinion is it OK, if the hydrocarbon composition which I presented above can meet MON = 90.1 (please see attachment)

 

 

Respectfully

 

Chemtoli

Attached Files

•  LPG MON+C.pdf   290.79KB   10 downloads

[PingPong]

Please note that that pdf does not specify what exactly is meant by C3 and C4.

 

Without the breakdown of the C3 and C4 fractions it is not possible to verify the mentioned MON of 90.1

 

The rather low MON suggests that there must be quite some olefins (propylene and/or butenes) present, because if the C3 and C4 were only propane and (iso)butane the LPG MON would be several points higher than 90.1

 

It is higher than the 89 minimum required by your country spec, so if they did not make a mistake the MON is just high enough, but I cannot confirm that number without the required C3 and C4 breakdowns.

 

Without the required C3 and C4 breakdowns it is also difficult to verify whether the LPG meets the winter season vapor pressure spec.

Edited by PingPong, 18 July 2014 - 11:55 AM.

[Tolinorton]

Dear Ping Pong,

 

 

Thank you very very much for the answer.

 

God bless you

[PingPong]

To calculate the MON of LPG use following procedure from EN589

 

 Calculation of MON for LPG.jpg   104.85KB   2 downloads