5 replies to this topic

[Abdelilah]

Hello guys !

 

I'm curious to know if the below formula to estimate the relative density of produced LPG by mean of volume concentration of components form C-2 to i-C5 is correct or not :

 

Relative density of mixture = Σ (relative density of component i x Volume concentration of component i)

 

Note : Relative density of compenent i (C2 to iC5) are taken from ASTM D-2421-02

 

Excel calculation draft file is provided as attachment from more clarification

 

Thanks in advance

 

 

 

Best regards

Attached Files

•  LPG CALCULATIONS.xls   48.5KB   33 downloads

[P.K.Rao]

The liquid densities of C2-C4 hydro carbons are, (Ref: Journal of Chemical Engineering, No 3, 1973)

 

Ethane : 0.34 gm/cub cm (This is taken separately, not from the journal)

Propane: 0.5072 gm/cub cm

Butane: : 0.5838 gm/cub cm

Iso butane:0.5625 gm/cub cm

 

Since the composition is in liquid percent (as per your Excel sheet), multiplying the liquid percents by the liquid densities and dividing the total by 100, the density of liquid LPG would be 0.53. You have obtained 0.5313. Both are in agreement

Edited by P.K.Rao, 21 November 2015 - 10:58 PM.

[Abdelilah]

Thanks dear P.K.Rao for clarifications.

 

Best Regards

[Abdelilah]

Dear P.K.Rao,

 

Do you have the copy of the (Journal of Chemical Engineering, No 3, 1973).

 

Would you please share it with us ?

 

Thanks in advance

[Napo]

Abdelilah,

 

The last versión of ASTM D2421 is 2013 year (ASTM D2421-13). I have put molecular mass and RD in your spreadsheet.

 

Napo.

Attached Files

•  LPG.xlsx   11.06KB   17 downloads

[P.K.Rao]

Please follow the following link:

 

http://pubs.acs.org/...rnalCode=jceaax