about 300 f at a pressure from slightly above atmospheric up to about 100 psig hereafter u201c atmospheric to 100 psig u201d feed 2 can enter zone 12 via line 10 at a temperature of from about ambient to about 500 f at a pressure of from atmospheric to 100 psig stream 14 can be essentially all hydrocarbon vapor formed from feed 2 and is at a temperature of from about 500 to about 750 f at a pressure of from atmospheric to 100 psig stream 15 can be essentially all the remaining liquid from feed 2 less that which was vaporized in pre heater 3 and is at a temperature of from about 500 to about 750 f at a pressure of from atmospheric to 100 psig the combination of streams 14 and 17 as represented by stream 25 can be at a temperature of from about 650 to about 800 f at a pressure of from atmospheric to 100 psig and contain for example an overall steam hydrocarbon ratio of from about 0 1 to about 2 stream 28 can be at a temperature of from about 900 to about 1 100 f at a pressure of from atmospheric to 100 psig in chamber 13 dilution ratios hot gas liquid droplets will vary widely because the composition of condensate varies widely generally the hot gas 21 e g steam to hydrocarbon ratio at the top of 13 can be from about 0 1 1 to about 5 1 preferably from about 0 1 1 to about 1 2 1 more preferably from about 0 1 1 to about 1.