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A method of controlling the supply and allocation of hydrogen gas in a hydrogen system of a refinery integrated with olefins and aromatics plants to convert crude oil into petrochemicals. The method includes one or more supply sources that provide hydrogen at individual rates, purities, pressures an

A method of controlling the supply and allocation of hydrogen gas in a hydrogen system of a refinery integrated with olefins and aromatics plants to convert crude oil into petrochemicals. The method includes one or more supply sources that provide hydrogen at individual rates, purities, pressures and costs, multiple consumption sites that consume hydrogen at individual rates, purities and pressures and an interconnecting hydrogen distribution network. The method further includes the integration of hydrogen consuming process units with hydrogen producing process units in which hydrogen recovered from the effluents from the hydrogen consuming process units and hydrogen recovered from the hydrogen producing process units are re-used in the hydrogen consuming process units.

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1. A method of controlling supply and allocation of hydrogen gas in a hydrogen system of a refinery integrated with olefins and aromatics plants to convert crude oil into petrochemicals, the system comprising one or more supply sources that provide hydrogen at individual rates, purities, pressures a

1. A method of controlling supply and allocation of hydrogen gas in a hydrogen system of a refinery integrated with olefins and aromatics plants to convert crude oil into petrochemicals, the system comprising one or more supply sources that provide hydrogen at individual rates, purities, pressures and costs, multiple consumption sites that consume hydrogen at individual rates, purities and pressures and an interconnecting hydrogen distribution network, said method comprising the integration of hydrogen consuming process units with hydrogen producing process units, wherein both hydrogen recovered from the effluents from the hydrogen consuming process units and hydrogen recovered from the hydrogen producing process units are re-used in the hydrogen consuming process units, wherein the method comprises the steps of: feeding a crude oil fraction together with hydrogen to one or more hydrogen consuming units;separating the effluent(s) from said one or more hydrogen consuming units into one or more streams comprising methane, ethane, propane, butane, pitch and BTX;feeding said one or more streams comprising ethane, propane and butane to one or more hydrogen producing units to produce hydrogen;integrating said stream comprising hydrogen originating from said hydrogen producing units into said hydrogen stream(s) to be fed to said one or more hydrogen consuming units, wherein at least 25 wt. % of said crude oil fraction is converted into a low boiling hydrocarbon fraction comprising ethane, propane and butanes, wherein said hydrogen producing process units comprise a steam cracking unit and one or more units chosen from the group of propane dehydrogenation unit (PDH), butane dehydrogenation unit (BDH) and combined PDH and BDH unit. 2. The method according to claim 1, wherein at least 50 wt % of said feed is converted into a low boiling hydrocarbon fraction comprising ethane, propane and butanes. 3. A method of controlling supply and allocation of hydrogen gas in a hydrogen system of a refinery integrated with olefins and aromatics plants to convert crude oil into petrochemicals, the system comprising one or more supply sources that provide hydrogen at individual rates, purities, pressures and costs, multiple consumption sites that consume hydrogen at individual rates, purities and pressures and an interconnecting hydrogen distribution network, said method comprising the integration of hydrogen consuming process units with hydrogen producing process units, wherein both hydrogen recovered from the effluents from the hydrogen consuming process units and hydrogen recovered from the hydrogen producing process units are re-used in the hydrogen consuming process units, wherein the method comprises the steps of: feeding a crude oil fraction together with hydrogen to one or more hydrogen consuming units;separating the effluent(s) from said one or more hydrogen consuming units into one or more streams comprising methane, ethane, propane, butane, pitch and BTX;feeding said one or more streams comprising ethane, propane and butane to one or more hydrogen producing units for producing one or more streams comprising hydrogen;integrating said stream comprising hydrogen originating from said hydrogen producing units into said hydrogen stream(s) to be fed to said one or more hydrogen consuming units, wherein at least 25 wt % of said crude oil fraction is converted into a low boiling hydrocarbon fraction comprising ethane, propane and butanes, wherein said hydrogen producing process units comprise a steam cracking unit and one or more units chosen from the group of propane dehydrogenation unit (PDH), butane dehydrogenation unit (BDH) and combined PDH, a BDH unit, a feed hydrocracking unit, gas oil hydrocracking unit, aromatic ring opening unit, resid hydrocracking unit, gasoline hydrocracker unit, a hydrodesulphurization unit, hydro-dearomatization unit and hydro-dealkylation unit. 4. A method of controlling supply and allocation of hydrogen gas in a hydrogen system of a refinery integrated with olefins and aromatics plants to convert crude oil into petrochemicals, the system comprising one or more supply sources that provide hydrogen at individual rates, purities, pressures and costs, multiple consumption sites that consume hydrogen at individual rates, purities and pressures and an interconnecting hydrogen distribution network, said method comprising the integration of hydrogen consuming process units with hydrogen producing process units, wherein both hydrogen recovered from the effluents from the hydrogen consuming process units and hydrogen recovered from the hydrogen producing process units are re-used in the hydrogen consuming process units, wherein the method comprises the steps of: feeding a crude oil fraction together with hydrogen to one or more hydrogen consuming units;separating the effluent(s) from said one or more hydrogen consuming units into one or more streams comprising methane, ethane, propane, butane, pitch and BTX;feeding said one or more streams comprising ethane, propane and butane to one or more hydrogen producing units for producing one or more streams comprising hydrogen;integrating said stream comprising hydrogen originating from said hydrogen producing units into said hydrogen stream(s) to be fed to said one or more hydrogen consuming units, wherein at least 25 wt. % of said crude oil fraction is converted into a low boiling hydrocarbon fraction comprising ethane, propane and butanes, wherein said hydrogen producing process units comprise a steam cracking unit and one or more units chosen from the group of propane dehydrogenation unit (PDH), butane dehydrogenation unit (BDH) and combined PDH, a BDH unit, a catalytic naphtha reformer unit and liquefied petroleum gas (LPO) unit. 5. The method according to claim 1, further comprising setting cut points of one or more separation units, setting operation conditions of hydrogen consuming process units and setting operation conditions of hydrogen producing process units in a process control system, wherein the values of said cut points and operation conditions are such that said supply and allocation of hydrogen gas in a hydrogen system of a refinery is controlled. 6. The method according to claim 1, further comprising purging excess hydrogen and/or supplying additional hydrogen from hydrogen producing units. 7. The method according to claim 1, further comprising feeding said effluent(s) from said hydrogen consuming process units to separating unit(s) and separating the effluents from said separating unit(s) into a lights fraction, a C2 fraction, a C3 fraction and a C4 fraction. 8. The method according to claim 7, further comprising feeding said C2 fraction to said steam cracking unit, said C3 fraction to said propane dehydrogenation unit and said C4 fraction to said butane dehydrogenation unit, respectively. 9. The method according to claim 7, further comprising feeding said C3 fraction and/or said C4 fraction to a said LPG aromatization unit. 10. The method according to claim 1, further comprising feeding a crude oil fraction to a catalytic naphtha reformer unit for producing hydrogen, wherein the hydrogen thus produced is sent to a hydrogen consuming unit. 11. The method according to claim 7, further comprising feeding said C2 fraction to said steam cracking unit. 12. The method according to claim 7, further comprising feeding said C3 fraction to said propane dehydrogenation unit. 13. The method according to claim 7, further comprising feeding said C4 fraction to said butane dehydrogenation unit. 14. The method according to claim 7, further comprising feeding said C3 fraction and said C4 fraction to a LPG aromatization unit. 15. The method according to claim 7, further comprising feeding said C3 fraction to a LPG aromatization unit. 16. The method according to claim 7, further comprising feeding said C4 fraction to a LPG aromatization unit. 17. The method according to claim 1, further comprising feeding a crude oil fraction to a catalytic naphtha reformer unit for producing hydrogen. 18. The method according to claim 1, further comprising supplying additional hydrogen to said hydrogen producing units.