Patent ID: 7741525

Claim:
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 stream, wherein the first stream comprises at least 90 volume percent propane, the second stream comprises at least 60 volume percent ethane, and the third stream has a vapor pressure of about 198 psig at 100° F. to about 208 psig at 100° F.