Use of oxygen analysis by GC-AED for control of fischer-tropsch process and product blending
First Claim
1. A method for producing a substantially paraffinic Fischer-Tropsch product comprising at least one oxygenated species, the method comprising the steps of:
- (a) selecting a concentration of oxygenated species in the substantially paraffinic Fischer-Tropsch product;
(b) performing a Fischer-Tropsch synthesis to provide a Fischer-Tropsch product stream;
(c) isolating a substantially paraffinic product stream comprising oxygenated species from the Fischer-Tropsch product stream;
(d) purifying the substantially paraffinic product stream to remove a portion of oxygenated species to provide a substantially paraffinic Fischer-Tropsch product comprising at least one oxygenated species;
(e) monitoring the substantially paraffinic Fischer-Tropsch product for concentration of oxygenated species by GC-AED; and
(f) adjusting the conditions of the purification of step (d) to ensure that the concentration of the oxygenated species in the substantially paraffinic Fischer-Tropsch product complies with the selected concentration.
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Abstract
Methods for producing a substantially paraffinic Fischer-Tropsch product or a blended Fischer Tropsch product comprising a selected oxygenate concentration, and if required, a selected oxygenate concentration of specific individual oxygenates, are disclosed. The methods of the present invention measure oxygenate concentration using GC-AED. The oxygenate measurements obtained using the GC-AED may be used to adjust and control various processes used to produce, upgrade, or finish Fischer Tropsch products to provide Fischer Tropsch products with a selected oxygenate concentration, and if required, a selected oxygenate concentration of specific individual oxygenates.
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Citations
36 Claims
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1. A method for producing a substantially paraffinic Fischer-Tropsch product comprising at least one oxygenated species, the method comprising the steps of:
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(a) selecting a concentration of oxygenated species in the substantially paraffinic Fischer-Tropsch product;
(b) performing a Fischer-Tropsch synthesis to provide a Fischer-Tropsch product stream;
(c) isolating a substantially paraffinic product stream comprising oxygenated species from the Fischer-Tropsch product stream;
(d) purifying the substantially paraffinic product stream to remove a portion of oxygenated species to provide a substantially paraffinic Fischer-Tropsch product comprising at least one oxygenated species;
(e) monitoring the substantially paraffinic Fischer-Tropsch product for concentration of oxygenated species by GC-AED; and
(f) adjusting the conditions of the purification of step (d) to ensure that the concentration of the oxygenated species in the substantially paraffinic Fischer-Tropsch product complies with the selected concentration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for preparing a blended Fischer-Tropsch product comprising at least one oxygenated species, the method comprising the steps of:
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(a) selecting a concentration of oxygenated species in the blended Fischer-Tropsch product;
(b) performing a Fischer-Tropsch synthesis to provide a Fischer-Tropsch product stream;
(c) isolating a substantially paraffinic product stream comprising oxygenated species from the Fischer-Tropsch product stream;
(d) blending the substantially paraffinic product stream with at least one non-oxygenate containing hydrocarbon stream to provide a blended product comprising at least one oxygenated species;
(e) monitoring the blended product for concentration of oxygenated species by GC-AED; and
(f) adjusting the blending ratio of step (d) to ensure that the concentration of the oxygenated species in the blended product complies with the selected concentration. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 34, 35, 36)
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30. An integrated process for preparing a blended Fischer-Tropsch product comprising at least one oxygenated species, the method comprising the steps of:
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(a) producing a substantially paraffinic Fischer-Tropsch product comprising at least one oxygenated species, the method comprising the steps of;
(i) selecting a concentration and carbon number distribution of oxygenated species in the substantially paraffinic Fischer-Tropsch product;
(ii) performing a Fischer-Tropsch synthesis to provide a Fischer-Tropsch product stream;
(iii) isolating a substantially paraffinic product stream comprising oxygenated species from the Fischer-Tropsch product stream;
(iv) purifying the substantially paraffinic product stream in a purification process to remove a portion of oxygenated species to provide a substantially paraffinic Fischer-Tropsch product comprising at least one oxygenated species;
(v) monitoring the substantially paraffinic Fischer-Tropsch product for concentration and carbon number distribution of oxygenated species by GC-AED; and
(vi) adjusting the conditions of the purification of step (iv) to ensure that the concentration and carbon number distribution of the oxygenated species in the substantially paraffinic Fischer-Tropsch product comply with the selected concentration and carbon number distribution. (b) selecting a concentration and carbon number distribution of oxygenated species in the blended Fischer-Tropsch product;
(c) blending the substantially paraffinic Fischer-Tropsch product with at least one non-oxygenate containing hydrocarbon stream to provide a blended product comprising at least one oxygenated species;
(d) monitoring the blended product for concentration and carbon number distribution of oxygenated species by GC-AED; and
(e) adjusting the blending ratio of step (d) to ensure that the concentration and carbon number distribution of the oxygenated species in the blended product comply with the selected concentration and carbon number distribution. - View Dependent Claims (31, 32)
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33. A method for controlling a process for producing a substantially paraffinic Fischer-Tropsch product comprising no detectable oxygenated species, the method comprising the steps of:
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(a) performing a Fischer-Tropsch synthesis to provide a Fischer-Tropsch product stream;
(b) isolating a substantially paraffinic product stream comprising oxygenated species from the Fischer-Tropsch product stream;
(c) purifying the substantially paraffinic product stream to remove oxygenated species to provide a substantially paraffinic Fischer-Tropsch product comprising no detectable oxygenated species;
(d) monitoring the substantially paraffinic Fischer-Tropsch product for concentration of oxygenated species by GC-AED; and
(e) adjusting the conditions of the purification of step (c) to ensure that the concentration of the oxygenated species in the substantially paraffinic Fischer-Tropsch product is not detectable.
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Specification