Process for hydroprocessing of non-petroleum feedstocks
A method of hydroprocessing is performed wherein non-petroleum feedstocks, such as those containing from about 10% or more olefinic compounds or heteroatom contaminants by weight, are treated in a first reaction zone to provide reaction products. The process involves introducing the feedstock along with diluents or a recycle and hydrogen in a first reaction zone and allowing the feed and hydrogen to react in a liquid phase within the first reaction zone to produce reaction products. The reaction products are cooled and/or water is removed from the reaction products. At least a portion of the cooled and/or separated reaction product are introduced as a feed along with hydrogen into a second reaction zone containing a hydroprocessing catalyst. The feed and hydrogen are allowed to react in a liquid phase within the second reaction zone to produce a second-reaction-zone reaction product.
1. A method of hydroprocessing comprising:
(a) introducing a non-petroleum feed to be treated along with a diluent and hydrogen into a first reaction zone in a reactor containing a hydroprocessing catalyst, the reactor containing 10% or less of any hydrogen gas by total volume of the reactor;
(b) allowing the feed and hydrogen to react in a liquid phase within the first reaction zone to produce reaction products, at least one of the reaction products being water, and wherein the diluent introduced in the first reaction zone has a capacity to dissolve or carry water within the first reaction zone to prevent the formation of a separate liquid aqueous phase;
(c) removing the reaction products from the first reaction zone;
(d) introducing at least a portion of the reaction products as a reaction product feed along with hydrogen into a second reaction zone containing a hydroprocessing catalyst; and
(e) allowing the reaction product feed and hydrogen to react in a liquid phase within the second reaction zone to produce a second-reaction-zone reaction product.
2. The method of claim 1 , wherein:
combining at least one of (1) a further portion of the removed reaction products of (c) and (2) at least a portion of the second-reaction-zone product of (e) with at least one of the feeds of (a) and (d).
3. The method of claim 1 , wherein:
separating water from the removed reaction products as an aqueous phase to provide a separated reaction product that is free from the separated water.
4. The method of claim 3 , wherein:
the separated reaction product forms the reaction product feed of (d).
5. The method of claim 1 , wherein:
the non-petroleum feed is comprised of pyrolysis oils.
6. The method of claim 1 , wherein:
the reactor is at least one of a plug flow reactor and a tubular reactor.
7. The method of claim 1 , wherein:
no hydrogen gas is recycled to the reactor.
8. The method of claim 1 , wherein:
the non-petroleum feed is introduced in the first reaction zone under conditions so that substantially all the feed and hydrogen are in a continuous liquid phase within the first reaction zone.
9. The method of claim 3 , wherein:
the removed reaction products of step (c) are cooled prior to separating water.
10. The method of claim 1 , wherein:
the reactor contains 5% or less of any hydrogen gas by total volume of the reactor.
11. The method of claim 1 , wherein:
excess hydrogen gas is vented from at least one of the first and second reaction zones.
12. A method of hydroprocessing comprising:
(a) introducing a non-petroleum feed containing oxygen along with a diluent and hydrogen into a first reaction zone in a reactor containing a hydroprocessing catalyst, the reactor containing 10% or less of any hydrogen gas by total volume of the reactor;
(b) allowing the feed and hydrogen to react in a liquid phase within the first reaction zone to produce reaction products, at least one of the reaction products being water, and wherein the diluent introduced in the first reaction zone has a capacity to dissolve or carry water within the first reaction zone to prevent the formation of a separate liquid aqueous phase;
(c) removing the reaction products from the first reaction zone;
(d) separating water from the removed reaction products to provide a separated reaction product that is free from the separated water;
(e) introducing at least a portion of the separated reaction product as a feed along with hydrogen into a second reaction zone containing a hydroprocessing catalyst;
(f) allowing the separated reaction products and hydrogen to react in a liquid phase within the second reaction zone to produce reaction products;
(g) removing the reaction products produced in (f) from the second reaction zone;
(h) cooling the removed reaction products from (g); and
(i) separating any gas phase and any liquid water phase from the cooled reaction products from (h) to form a separated reaction product that is free from any separated liquid water to provided a separated liquid reaction product.
13. The method of claim 12 , wherein:
the diluent is provided by at least one of (1) a further portion of the separated reaction product of step (d) and (2) at least a portion of the separated liquid reaction product of step (i).
14. The method of claim 12 , wherein:
the separated reaction products of steps (d) and (i) are substantially water-free.
15. The method of claim 12 , wherein:
the non-petroleum feed is comprised of pyrolysis oils.
16. The method of claim 15 , wherein:
the non-petroleum feed is introduced in the first reaction zone under conditions so that substantially all the feed and hydrogen are in a continuous liquid phase within the first reaction zone.
17. A method of hydroprocessing comprising:
(a) introducing a non-petroleum feed to be treated containing at least one of olefinic compounds and heteroatom contaminants along with a diluent and hydrogen into a first reaction zone in a reactor containing a hydroprocessing catalyst, the reactor containing 10% or less of any hydrogen gas by total volume of the reactor;
(b) allowing the feed and hydrogen to react in a liquid phase within the first reaction zone to produce reaction products, at least one of the reaction products being water, and wherein the diluent introduced in the first reaction zone has a capacity to dissolve or carry water within the first reaction zone to prevent the formation of a separate liquid aqueous phase;
(c) removing the reaction products from the first reaction zone;
(d) introducing at least a portion of the reaction products as a feed along with hydrogen into a second reaction zone containing a hydroprocessing catalyst; and
(e) allowing the reaction products and hydrogen to react in a liquid phase within the second reaction zone to produce a second-reaction-zone reaction product.
18. The method of claim 17 , wherein:
the diluent is provided by at least one of (1) a further portion of the reaction products of (c) and (2) at least a portion of the second-reaction-zone reaction product of (e).
19. The method of claim 17 , further comprising:
separating any water from the reaction products of (c) and (e) as an aqueous phase to provide separated reaction products that are free from the separated water; and wherein
the diluent is provided by at least a portion of one of the separated reaction products from (c) and (e).
20. The method of claim 17 , wherein:
the non-petroleum feed is introduced in the first reaction zone under conditions so that substantially all the feed and hydrogen are in a continuous liquid phase within the first reaction zone.