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Blending Operations

Started by vijay kumar, Oct 22 2004 08:22 AM

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#1 vijay kumar

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Posted 22 October 2004 - 08:22 AM

hi friends,
1)I would like to do blending of two grades of oil streams from our vacuum fractionator in such a way that i get the product of desired viscosity.Any thumbrule or guide lines(atleast a good link from web?)
2)Is there any correlation/formulae available to predict the viscosity index of an oil if i know the viscosity at two different temperatures(say 40deg celsius and 100 deg celsius)
3) similarly any correlation to find a flash point of a product obtained from blending two streams of different flash points in different quantities?

Hope to see a fitting reply from our co-members!
Thanks.
vijay rolleyes.gif

#2 mbeychok

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Posted 22 October 2004 - 03:10 PM

Vijay Kumar:

Chapter 11 of this book is devoted to the blending of refinery stream physical properties (viscosity, flash point, pour point, RVP, etc.):

Gary, James H. and Handwerk, Glenn E., " Petroleum R%efining Technology and Economics", Marcel Dekker Inc., New York and Basel, 1984 (ISBN 0824771508)

#3 Guest_Jon Watson_*

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Posted 23 February 2005 - 12:45 AM

Firstly, you will find a spreadsheet in Cheresources for the temperature viscosity relationship of hydrocarbons. (I found it in the newlsetter archive for December).

Second, most oil properties are additive except viscosity which is approximated using the Anderade equations or the Louis & Refutas Methods. However, since heavy fuel oils are commonly blended from residual oil and low viscosity cutter stock and this is a routine calculation, your best bet is to ask DNV PS, Shell Marine Fuels, Exxon Mobil Marine Fuels or any of the major oil companies for a free calculator for Windows. These all agree very well. You can also look for one on the www.steamesteem.com website also.

However, viscosity is a very sensitive indicator of change which means that it is also very difficult to accurately control by any means other than using a process viscometer for feedback control.

You can see from www.cbi.dk or www.jiskoot.com (both producers of beldning skids for fuels and crudes) that they routinely offer viscosity feedback control based on modern doigital viscometers.

There is a flash point calculator somewhere on the web, i think but you'd need to search for it.

#4 JMW

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Posted 23 February 2005 - 01:19 AM

I must correct myself. (It's late at night here)
The Andarade equation is for temperature Vs Viscosity.
There is a spreadsheet for this available in the Cheresources plus area.
The other spreadsheet I refer to is specifically for hydrocarbons and based on the ASTM D341 equation.
Louis and Refutas is riight for the viscosity of mixtures/blends.
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