Olefin production utilizing a feed containing condensate and crude oil
View Patent ↗A method for utilizing a feed comprising condensate and crude oil for an olefin production plant is disclosed. The feed is subjected to vaporization and separated into vaporous hydrocarbons and liquid hydrocarbons. The vaporous hydrocarbons stream is thermally cracked in the plant. The liquid hydrocarbons are recovered.
1. A method comprising:
(a) providing a feed comprising a condensate and a crude oil and containing up to 30 weight percent heavy hydrocarbons that boil at >900° F. at atmospheric pressure;
(b) directing the feed to a first zone of a vaporization unit and separating a portion of the feed in the first zone into a first vapor stream and a first liquid stream while the first zone is at a temperature of from ambient to about 350° F. and at a pressure of from atmospheric to about 100 psig;
(c) passing the first vapor stream to a cracking furnace having in its interior at least a convection section and a separate radiant section;
(d) passing the first liquid stream to a second zone of the vaporization unit;
(e) contacting the first liquid stream with a counter-current stream of steam having a temperature of from about 650 to about 850° F in an appropriate amount in the second zone of the vaporization unit so that the first liquid stream intimately mixes with the steam to cause vaporization and to produce a second vapor stream and a second liquid stream comprising a distillate fraction;
(f) controlling the temperature of the second vapor stream to be from about 170 to about 450° F. and the boiling range of the distillate fraction to be from about 350 to about 650° F.;
(g) passing the second vapor stream to the radiant section of the cracking furnace; and
(h) recovering the second liquid stream from the second zone of the vaporization unit.
2. The method of claim 1 wherein the feed contains up to 20 weight percent heavy hydrocarbons.
3. The method of claim 1 wherein the feed contains up to 10 weight percent heavy hydrocarbons.
4. The method of claim 1 wherein the feed is preheated to a temperature of from about 200 to about 350° F. before it enters the vaporization unit.
5. The method of claim 1 wherein the feed is preheated by the convection section of the furnace.
6. The method of claim 1 wherein the vaporization unit is outside the furnace.
7. The method of claim 1 wherein the second zone has at least one liquid distribution device.
8. The method of claim 1 wherein the second zone contains a tower packing material.