HYDROPROCESSING PROCESS FOR THE IMPROVEMENT OF THE CATALYST LIFE
This invention relates to a hydroprocessing process for the improvement of catalyst life. Such inventive process is carried out with intermittent or discontinuous addition of a co-feed stream when hydroprocessing petroleum based feedstock or an oxygen containing feedstock. More specifically, it has been found that intermittent or discontinuous addition of the co-feed stream such as carbon monoxide, carbon dioxide, or their precursors to the hydrogen stream can reduce the long term deactivation, extend the life and increase run length of a cobalt/molybdenum hydrotreating catalyst.
1 . A process comprising
a) providing a feedstock selected from a petroleum based hydrocarbon feedstock or an oxygen containing feedstock;
b) providing a hydroprocessing catalyst;
c) providing a co-feed stream; and
d) contacting said feedstock with said hydroprocessing catalyst under a hydroprocessing condition with an intermittent or a discontinuous addition of said co-feed stream.
2 . The process of claim 1 wherein said petroleum based hydrocarbon feedstock is selected from a group consisting of C5+ paraffins, naphthas, kerosene, gasoline, heating oils, jet fuels, diesel, cycle oils, catalytically cracked light and heavy gas oils, hydrotreated gas oil, light flash distillate, vacuum gas oil, light gas oil, straight run gas oil, coker gas oil, synthetic gas oil, deasphalted oils, foots oil, slack waxes, waxes obtained from a Fischer-Tropsch synthesis process, long and short residues, syncrudes, optionally originating from tar sand, shale oils, residue upgrading processes, and any mixture thereof
3 . The process of claim 1 wherein said oxygen containing feedstock is any feed molecules containing oxygen atoms.
4 . The process of claim 1 wherein said oxygen containing feedstock is selected from a group consisting of vegetable oil, animal fat, algae oil, glycols, polyols, sugar alcohols, biomass, organic compounds, and any mixture thereof
5 . The process of claim 4 wherein said biomass or organic compound contains functional groups which can be reduced or hydrogenated.
6 . The process of claim 1 wherein said intermittent or discontinuous addition of said co-feed stream occurs for 1 to 10 days followed by 1 day to 50 weeks without co-feed.
7 . The process of claim 1 wherein said intermittent or discontinuous addition of said co-feed stream occurs for 2 to 3 days followed by 4 to 10 weeks without co-feed.
8 . The process of claim 1 wherein said co-feed stream is CO, CO 2 , or their precursor.
9 . The process of claim 8 wherein said precursor is a compound which releases CO or CO 2 under said hydroprocessing condition.
10 . The process of claim 8 wherein said precursor is selected from the group consisting of carboxylic acids, carbonates, formaldehyde, glyoxalin, carbonyls, vegetable oil, animal fat, algae oil, glycols, polyols, sugar alcohols, and any mixture thereof.
11 . The process of claim 1 wherein said hydroprocessing catalyst is a metal-containing hydroprocessing catalyst.
12 . The process of claim 11 wherein said metal is selected from Groups 3-10 of the Periodic Table.
13 . The process of claim 11 wherein said metal is selected from a group consisting of Mo, W, Ni, Co, Ru, and mixture thereof.
14 . The process of claim 1 wherein said hydroprocessing catalyst is supported on an inorganic oxide support.
15 . The process of claims 1 wherein said hydroprocessing condition comprises a temperature in the range from about 250 to about 800° F., a pressure in the range from about 100 to 2500 psig.
16 . The process of claims 1 wherein said hydroprocessing process is a hydrotreating process carried out by a hydrotreating catalyst under a hydrotreating condition.
17 . The process of claim 16 wherein said hydrotreating condition comprises a temperature in the range from about 250 to about 800° F., and a pressure in the range from about 100 to 2500 psig.
18 . The process of claim 16 , wherein said hydrotreating catalyst is selected from a group consisting of Co, Mo, Ni, W, and mixtures thereof
19 . The process of claim 16 , wherein said hydrotreating process is hydrogenation, hydrodesulphurization, hydrodenitrogenation, hydrodeoxygenation or aromatics saturation.
20 . The process of claim 1 wherein said hydroprocessing process is a hydrocracking process carried out by a hydrocracking catalyst under a hydrocracking condition.
21 . The process of claim 20 wherein said hydrocracking catalyst is selected from a group consisting of Co, Mo, Ni, W and any combination thereof
22 . The process of claim 20 wherein said hydrocracking conditions comprises a temperature in the range from about 500 to about 900° F., and a pressure in the range from about 100 to 2500 psig.