Energy recovery and transport system

• US 5,866,751 A
• Filed: 10/01/1996
• Issued: 02/02/1999
• Est. Priority Date: 10/01/1996
• Status: Expired due to Fees

• Current Assignee: McDermott Technology, Inc.
• Original Assignee: McDermott Technology, Inc.
• Inventors: Witt, Mary A., McKain, Rodger W., Womack, E. Allen Jr.
• Primary Examiner(s): Griffin, Walter D.
• Assistant Examiner(s): NORTON, NADINE GEORGIANNA
• Application Number:
  US08/722,732
• Time in Patent Office: 854 Days
• Field of Search: 208/108, 585/899, 585/518, 585/14
• US Class Current: 585/899
• CPC Class Codes: C07C 1/0485 Set-up of reactors or accessories; Multi-step processes
• CPC Class Codes: C07C 9/22 with more than fifteen carbon atoms

Abstract

A safe, environmentally sound method for transporting energy-containing hydrocarbons from a remote natural gas source of hydrocarbons to a local site for further processing or refining. The natural gas is converted at the remote site, using a modified Fischer-Tropsch process, to produce non-volatile, long chain hydrocarbons, i.e., paraffins (C₂₀ -C₃₆) at the remote site, transporting the paraffins via rail, ship, or cargo air plane to a local site, and then further processing and/or refining the paraffins via distillation, cracking, or combining with other hydrocarbon feedstocks to produce fuel products at the local site for use.

Claims

1. A method for transporting the energy content of a natural gas hydrocarbon fuel from a remote site of origin to a local site for use by converting the natural gas hydrocarbon fuel at the remote site into a non-volatile, solid form which floats on water, will not explode or boil upon contact with air in the same manner as liquid natural gas, and which does not diffuse or disperse like oil, such that it can be transported in solid form in a manner that is non-reactive, non-explosive, and non-toxic with the surrounding environment from the remote site to the local site, and then recovering the energy content of the natural gas hydrocarbon fuel at the local site to produce a useful fuel product, comprising the steps of:

providing natural gas from a source at a remote site of origin;

at the remote site, converting the natural gas into and maximizing the production of long-chain, non-volatile, solid paraffin wax hydrocarbons in the C₂₀ -C₃₆ range;

transporting the long-chain, non-volatile, solid paraffin wax hydrocarbons in solid form from the remote site to a local site; and

at the local site, one of storing, hydrocracking, and combining the long-chain paraffin wax hydrocarbons with a feedstock, to recover the energy content of the long-chain paraffin wax hydrocarbons to produce a useful fuel product.

2. The method according to claim 1, wherein the natural gas hydrocarbon fuel at the remote site comprises methane.

3. The method according to claim 1, wherein the step of converting the natural gas hydrocarbon fuel comprises providing the natural gas to a reformer for producing hydrogen and carbon monoxide synthesis gas, and reacting the hydrogen and carbon monoxide synthesis gas to produce the long-chain paraffin wax hydrocarbons.

4. The method according to claim 3, wherein the hydrogen and carbon monoxide synthesis gas is reacted in a Fischer-Tropsch reactor.

5. The method according to claim 4, further comprising the step of selecting a catalyst to maximize the production of long-chain paraffin wax hydrocarbons in the C₂₀ -C₃₆ range in the Fischer-Tropsch reactor.

6. The method according to claim 5, further comprising the step of transporting the long-chain paraffin wax hydrocarbons from the remote site to the local site with a ship.

7. The method according to claim 5, further comprising the step of transporting the long-chain paraffin wax hydrocarbons from the remote site to the local site with a truck.

8. The method according to claim 5, further comprising the step of transporting the long-chain paraffin wax hydrocarbons from the remote site to the local site with a railroad car.

9. The method according to claim 5, further comprising the step of transporting the long-chain paraffin wax hydrocarbons from the remote site to the local site with a cargo airplane.

10. The method according to claim 1, further comprising the step of storing the long-chain paraffin wax hydrocarbons at the local site.

11. The method according to claim 10, further comprising the step of hydrocracking the stored long-chain paraffin wax hydrocarbons at the local site.

12. The method according to claim 10, further comprising combining the stored long-chain paraffin wax hydrocarbons with feedstock at the local site.

13. A method according to claim 12, further comprising the step of hydrocracking the combined stored long-chain paraffin wax hydrocarbons and feedstock at the local site.

14. The method according to claim 4, further comprising the step of varying Fischer-Tropsch process parameters to maximize the production of long-chain paraffin wax hydrocarbons in the C₂₀ -C₃₆ range in the Fischer-Tropsch reactor.

15. The method according to claim 14, wherein said Fischer-Tropsch process parameters comprise at least one of pressure, temperature and residence time.

16. The method according to claim 1, wherein the feedstock is a hydrocarbon feedstock.

17. The method according to claim 16, wherein the hydrocarbon feedstock is crude oil.