Patent ID: 7456328
Filing Date: 2008-11-25
Classification: B01F,G01N,G05D,Y10T

Abstract:
1. A method of blending a first stream comprising propane and a second stream comprising ethane to produce a third stream comprising ethane and propane, the method comprising the steps of: (i) generating a first signal representative of a flow volume of the first stream; (ii) generating a second signal representative of a targeted concentration of ethane in the third stream; (iii) generating a third signal representative of the concentration of propane in the first stream; (iv) generating a fourth signal representative of the concentration of propane in the second stream; and using the first signal, the second signal, the third signal, and the fourth signal to generate a fifth signal representative of a flow rate of the second stream necessary to produce a desired composition comprising ethane and propane in the third stream produced by blending the first and second streams, wherein the first stream comprises at least 90 volume percent propane and has a vapor pressure of about 170 psig at 100° F. to about 186 psig at 100° F., the second stream comprises at least 60 volume percent ethane and has a vapor pressure of about 392 psig at 100° F., to about 785 psig at 100° F., and the third stream has a vapor pressure of about 198 psig at 100° F., to about 208 psig at 100° F.