temperature of the stream s 104 at the point 38 thereafter the stream s 104 having the parameters as at the point 38 passes through a first heat exchanger he 1 where it is cooled and partially condensed and releases heat in a first heat exchange process producing a second mixed stream s 106 having parameters as at a point 15 the stream s 106 having the parameters as at the point 15 is then mixed with a stream s 108 having parameters as at a point 8 forming a stream s 110 having parameters as at a point 16 in the preferred embodiment of this system the temperatures of the streams s 108 s 106 and s 110 having parameters of the points 8 15 and 16 respectively are equal or very close within about 5 a concentration of the low boiling component in stream s 108 having the parameters as at the point 8 is substantially lower than a concentration of the low boiling component in the stream s 106 having the parameters as at the point 15 as a result a concentration of the low boiling component in the stream s 110 having the parameters as at the point 16 is lower than the concentration of the low boiling component of the stream s 106 having the parameters as at the point 15 i e stream s 110 having the parameters as at the point 16 is leaner than stream s.