Method of purifying fischer-tropsch derived water
First Claim
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1. A process for the production of a purified water from a Fischer-Tropsch reaction water comprising one or more components selected from the group consisting of oxygenated hydrocarbons, aliphatic, aromatic and cyclic hydrocarbons, inorganic compounds, and mixtures thereof, wherein the process comprises the steps of:
- a) distilling the Fischer-Tropsch reaction water in a primary treatment stage, whereby at least a fraction of non-acid oxygenated hydrocarbons are removed from the Fischer-Tropsch reaction water to produce a primary water enriched stream;
b) conducting a biological treatment of the primary water enriched stream in a secondary treatment stage, whereby at least a fraction of acidic oxygenated hydrocarbons are removed from at least a portion of the primary water enriched stream to produce a secondary water enriched stream; and
c) removing at least some solids from at least a portion of the secondary water enriched stream in a tertiary treatment stage, whereby a purified water is obtained, the purified water comprising an aqueous stream having a chemical oxygen demand of from 20 to 500 mg/l, a pH of from 6.0 to 9.0, a suspended solids content of less than 250 mg/l, and a total dissolved solids content of less than 600 mg/l.
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Abstract
A process for the production of highly purified water 44 from Fischer-Tropsch reaction water 12 includes distillation 14 as a primary treatment stage, biological treatment including anaerobic digestion 20 and aerobic digestion 22 as a secondary treatment stage, solid-liquid separation 32 as a tertiary treatment stage and a dissolved salt and organic removal stage 40 as final treatment stage.
27 Citations
20 Claims
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1. A process for the production of a purified water from a Fischer-Tropsch reaction water comprising one or more components selected from the group consisting of oxygenated hydrocarbons, aliphatic, aromatic and cyclic hydrocarbons, inorganic compounds, and mixtures thereof, wherein the process comprises the steps of:
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a) distilling the Fischer-Tropsch reaction water in a primary treatment stage, whereby at least a fraction of non-acid oxygenated hydrocarbons are removed from the Fischer-Tropsch reaction water to produce a primary water enriched stream; b) conducting a biological treatment of the primary water enriched stream in a secondary treatment stage, whereby at least a fraction of acidic oxygenated hydrocarbons are removed from at least a portion of the primary water enriched stream to produce a secondary water enriched stream; and c) removing at least some solids from at least a portion of the secondary water enriched stream in a tertiary treatment stage, whereby a purified water is obtained, the purified water comprising an aqueous stream having a chemical oxygen demand of from 20 to 500 mg/l, a pH of from 6.0 to 9.0, a suspended solids content of less than 250 mg/l, and a total dissolved solids content of less than 600 mg/l. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A process for the production of a highly purified water from a Fischer-Tropsch reaction water comprising one or more components selected from the group consisting of oxygenated hydrocarbons, aliphatic, aromatic and cyclic hydrocarbons, inorganic compounds, and mixtures thereof, wherein the process comprises the steps of:
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a) distilling the Fischer-Tropsch reaction water in a primary treatment stage, whereby at least a fraction of non-acid oxygenated hydrocarbons are removed from the Fischer-Tropsch reaction water to produce a primary water enriched stream; b) conducting a biological treatment of the primary water enriched stream in a secondary treatment stage, whereby at least a fraction of acidic oxygenated hydrocarbons are removed from at least a portion of the primary water enriched stream to produce a secondary water enriched stream; c) removing by solid-liquid separation at least some solids from at least a portion of the secondary water enriched stream in a tertiary treatment stage to produce a tertiary water enriched stream; and d) removing at least a portion of dissolved salts and residual organic species from at least a portion of the tertiary water enriched stream in a final treatment stage, whereby a highly purified water is obtained, the highly purified water comprising an aqueous stream having a chemical oxygen demand of less than 50 mg/l, a pH of from 6.0 to 9.0, a suspended solids content of less than 50 mg/l, and a total dissolved solids content of less than 100 mg/l. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification