Purge and recycle stream, Chemistry

The fresh feed to an ammonia production process contains nitrogen (N2) and hydrogen (H2) in stoichiometric proportion, along with an inert gas (I).   The feed is combined with a recycle stream containing the same three species, and the combined stream is fed to a reactor in which a low single pass conversion of nitrogen is achieved.  The reactor effluent flows to a condenser.  A liquid stream containing essentially all of the ammonia formed in the reactor and a gas stream containing all of the inerts and the unreacted nitrogen and hydrogen leave the condenser.  The gas stream is split into two fractions:  one is removed from the process as a purge stream, and the other is the recycle stream combined with the fresh feed. 

a.  Let xI0 be the mole fraction of inerts in the fresh feed, fsp the single pass conversion of nitrogen in the reactor and yp the fraction of the gas leaving the condenser that is purged (mol purged/ mol total). Taking a basis of 1 mol fresh feed, draw and fully label a process flowchart, incorporating xI0, fsp, and yp in the labeling.  Then, assuming that the values of these three variables are given, write a set of equations for the total moles fed to the reactor (nA), the moles of ammonia produced (np), and the overall nitrogen conversion (fov).  Each equation should involve only one unknown variable, which should be circled.

b.  Solve the equations of part a for xI0=0.01, fsp=0.20, yp=0.10. 

c.  Briefly explain in your own words the reasons for including (i) the recycle stream and (ii) the purge stream in the design process.

Posted Date: 3/19/2013 1:25:08 AM | Location : United States







Related Discussions:- Purge and recycle stream, Assignment Help, Ask Question on Purge and recycle stream, Get Answer, Expert's Help, Purge and recycle stream Discussions

Write discussion on Purge and recycle stream
Your posts are moderated
Related Questions


Q. Evolution of the Modern Atomic Model? Ans: The atomic models of Dalton, Thomson, Rutherford, and Bohr eventually evolved into the current-day Quantum Mechanical model of the

Just like lithium and beryllium in Groups Land 2, boron also shows anomalous behaviour. In general, the boron chemistry resembles that of silicon (occupying a diagonal position in

Element  is strongly electropositive and Y  is strongly electronegative. Both element are univalent, the compounds formed from their combination will be: (1) X + Y -

if the eluting solvent was chnaged would Rf value for each metal ion will chang

Problem: Let us calculate Q value of the reaction 27 Al (d, α) 25 Mg Answer: Given that masses of 27 Al = 26.981541        2 H        = 2.014102 4 He = 4.

Why are they (Lanthanides and Actinides) called Inner Transition Elements?

Sensory evaluation during product life cycle The basic procedure for developing a new  product, and supporting it while marketed, included distinct steps that are constant no

give an assignment of organic compounds