Synthetic transportation fuel and method for its production

a technology of synthetic transportation and fuel, which is applied in the direction of fuels, thickeners, organic chemistry, etc., can solve the problems of increasing yield loss, affecting the quality of hydroprocessing catalysts, and necessitating a severity increase in hydroprocessing conditions, so as to improve lubricity and yield loss, the effect of reducing the temperatur

Inactive Publication Date: 2005-07-28
SYNTROLEUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The invention meets these and other needs by providing a transportation fuel or blending stock for a transportation fuel which contains substantially no FT oxygenates, sulfur or other hetero-atom components. The invention further provides a method of producing a transportation fuel or blending stock which eliminates oxygenates, improves lubricity and lower temperature properties, but which is economical and does not cause any significant yield loss or which results in significantly less yield loss than known hydroprocessing and hydrotreatment methods.

Problems solved by technology

The presence of FT oxygenates presents certain problems with processing the syncrude, including a negative impact on hydroprocessing catalysts which necessitates an increase in the severity of hydroprocessing conditions.
With increasing severity of hydroprocessing, yield loss increases.
However, hydrotreatment requires significant additional capital equipment expenditures.
While a bypassed 250-400° F. distillation cut has no appreciable negative impact when re-blended into the product fuel, reincorporation of a bypassed 400° F.+ distillation cut impairs the low temperature properties of the product fuel due to the presence of FT oxygenates.
Therefore, it is common to hydroprocess the entire 400° F.+ fractions, including hydrogenation of FT oxygenates, which has significant negative impact on hydroprocessing catalyst life and further causes yield loss.
As mentioned above, however, hydroprocessing at severe conditions raises the costs of processing and the resulting product and further results in yield loss.

Method used

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  • Synthetic transportation fuel and method for its production
  • Synthetic transportation fuel and method for its production

Examples

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Effect test

example 1

[0047] A pilot installation consisting of two distillation columns was used to produce C10-13 light kerosene and C13-20+ drilling fluid feedstock streams. The columns were fed approximately 3400 g / hr of liquid Fischer-Tropsch oil. The Fischer-Tropsch oil had approximately the following composition:

Carbon #% by wt.450.0160.371.082.995.9108.1119.2129.5139.2148.4157.9167.1176.2185.4194.6203.7213.0222.3231.7241.225+2.6Total100.00

[0048] The Fischer-Tropsch oil was fed into the first column and C13 and lighter materials were distilled overhead. The column conditions were: 10 psig pressure, 480° F. feed preheat temperature, 407° F., overhead temperature, 582° F. bottoms temperature. The first column had approximately 98 inches of Sulzer Mellapack 750Y packing. The overheads of the first column was fed into the second column operating at 12 psig pressure, 370° F. overhead temperature and 437° F. bottoms temperature. The second column was packed with 28 inches of Sulzer EX packing. The bot...

example 2

[0050] 30 cc / hr of a Feed A from Example 1 was fed via a syringe pump and mixed with 20 cc / min of nitrogen. The gas / liquid mixture was introduced upflow into a vessel packed with stainless steel mesh saddles, where the liquid was vaporized and superheated to reaction temperature of 560° F. The vaporized feed was fed upflow into a reactor packed with ⅛ Alcoa S-400 alumina catalyst and suspended in a heated sandbath. The sandbath was maintained at the reaction temperature and ebulated by air. Reactor LHSV was maintained at about 0.26 hr−1. The reactor outlet was condensed and Product A and water by-product was collected in a product accumulator. System pressure was maintained by controlling the product accumulator overhead pressure at 50 psig. A water layer was drained and the organic layer product analyzed in a HP 5890 Series II GC with a 60 m RTXI capillary column with a 0.32 mm bore and 3-micron film thickness. The compositions of Feed A and Product A are reported in Table 3. The p...

example 3

[0051] 15 cc / hr of Feed A from Example 1 was processed in a benchscale process described in Example 2. The feed was vaporized and superheated to 650° F. Reactor LHSV was approximately 0.26 hr−1 to make Product A and, 0.13 hr−1 to make Product B. Composition of Product B from this example is reported in Table 3. 1H NMR analysis confirmed absence of alcohols in the product.

TABLE 3Sample Reference NumberFeed AProduct AProduct BMass %Mass %Mass %N-PARAFFIN80.6480.2379.90ALPHA OLEFIN4.438.207.96INTERNAL OLEFIN3.043.373.91BRANCHED PARAFFIN8.218.198.22ALCOHOL3.680.000.00100.00100.00100.00

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Abstract

A transportation fuel or blending stock for a transportation fuel which contains substantially no FT oxygenates and no sulfur is provided. An economical method of producing a transportation fuel or blending stock which eliminates oxygenates and which does not cause any significant yield loss is also provided.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority to U.S. Application Ser. No. 60 / 455,224 filed on Mar. 114, 2003, the contents of which is hereby incorporated by reference in its entirety.FEDERALLY SPONSORED RESEARCH [0002] Not applicable. REFERENCE TO MICROFICHE APPENDIX [0003] Not applicable. FIELD OF THE INVENTION [0004] The invention relates to a method of producing a transportation fuel or blending stock therefor derived from the products of a Fischer-Tropsch synthesis. More specifically, the invention relates to a process in which the oxygenates are converted in a selective low-cost process. The invention further relates to a transportation fuel or blending stock therefor, having a high cetane number, high lubricity, high stability, and having substantially no oxygenates, sulfur or other hetero-atom components. BACKGROUND OF THE INVENTION [0005] Synthetic transportation fuels are increasingly in demand because they contain no sulfur or aromatics ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C1/04C07B61/00C07C9/00C07C11/02C07C29/151C07C31/00C10G2/00C10G65/12C10L1/04C10L1/08
CPCC10L1/08
Inventor ABAZAJIAN, ARMEN N.TOMLINSON, H. LYNNFREERKS, ROBERT
Owner SYNTROLEUM
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