How LPG gets liquefied by elevating the pressure?If the
pressure is increased the temperature also increases,then
how LPG is in liquid form?

Answer Posted / subhasish

We need to recall the joule thompson effect.
The Joule-Thomson coeffcient JT is defned as derivative of
the temperature T with respect to the pressure p at
constant enthalpy h.

coeff = (dT/dP) at const h

The curve is an inverted U shaped type and when the slope
i.e. co-eff is +ve then temp of gas increases with increase
in pressure and this is true for LPG also (Boiling point~-
38 degC at 1 atm pressure). It implies, LPG can be
liquefied by increasing pressure as the dew point also
increase. That's why even at room temp, by increasing
pressure LPG can be liquefied.

Is This Answer Correct ?    9 Yes 1 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

What could be a possible cause for sudden foaming in a cooling tower?

631


What step should be taken in process industries if the process variable is oscillating?

2186


i am a student of thapar university final year.can anybody please help me with the exam pattern of the companies:engineers india ltd. ; iocl ; UOP, HPCL. If psbl plz send me the previous years questions on this email id k_arora1987@yahoo.com. i d be really greatful

1902


sir,please give me some exam paper for referance. Thanks & Regards,

1696


What are the various utilities of the process plant?

647






What is the significance of the minimum flow required by a pump?

605


What are the problems that are associated with the expansion joints?

635


how we can find solubility of liquid in amyl alcohol and relative solubility of amyl alcohol

1137


What are some factors to consider when trying choosing between a dry screw compressor and an oil-flooded screw compressor?

607


How can I treat a waste stream containing both hexavalent chromium and arsenic?

607


Can asphalt be recycled to form a useful product?

610


Explain how can you estimate the efficiency of a pump?

587


When should one be concerned with the tube wall temperature on the cooling waterside of a shell and tube exchanger?

592


i have done B.TECH in che.tech.and doing MBA . why you doing mba why u have not join any job.

1843


Is there any way to repair a valve that is passing leaking internally without taking our process offline?

715