Process for reducing the level of elemental sulfur in hydrocarbon streams

a technology of elemental sulfur and hydrocarbon streams, which is applied in the petroleum industry, hydrocarbon oil refining, heating/cooling, etc., can solve the problems of corroding and damaging elemental sulfur in hydrocarbon streams, copper and copper alloys, and the like, and achieves the reduction of the level of oxygen, the level of sulfur picked up, and the effect of reducing the level of oxygen

Inactive Publication Date: 2006-01-19
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] In accordance with the present invention, there is provided a process for reducing the level of sulfur picked-up in a hydrocarbon stream of interest being transported in a pipeline that is used to transport various sulfur-containing petroleum streams, which process comprises: (i) reducing the level of oxygen to less than about 30 wppm in the hydrocarbon stream of interest to be transported through a pipeline; and (ii) reducing the level of oxygen to less than about 30 wppm in at least the first hydrocarbon stream transported in the pipeline immediately ahead of the transport of said hydrocarbon stream of interest.

Problems solved by technology

It is well known that elemental sulfur in hydrocarbon streams, such as petroleum streams, is corrosive and damaging to metal equipment, particularly to copper and copper alloys.
Additional contamination will typically take place as a consequence of transporting the refined stream through pipelines that contain sulfur contaminants remaining in the pipeline from the transportation of sour hydrocarbon streams, such as petroleum crudes.
The sulfur has a particularly corrosive effect on equipment such as brass valves, gauges and in-tank fuel pump copper commutators.
Elemental and organic sulfur contaminants that are picked-up in the pipeline by gasoline and diesel products will adversely affect their ability to meet the ultra low sulfur specifications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] A 5% H2S in N2 mixture was bubbled through four liters of crude at 4 ft3 / hr for approximately one hour in order to replace any H2S that may have evolved from the original crude sample. The H2S / crude mixture was then recycled overnight at 10 cc / min through a 0.75″ OD×18″ long column of iron filings (˜40 mesh) to simulate the crude cycle in a pipeline. The packed bed of iron filings was used to simulate the pipeline wall effects. The column was then subjected to a series of refined products to simulate the product cycle in a pipeline. The following product cycle was tested: (1) 300 cc of ultra low sulfur diesel (ULSD) initially containing 0.5 mg / l total sulfur and 0 mg / l of elemental sulfur (S°); (2) 1 liter of MTBE initially containing 9.3 mg / l total sulfur and 0 mg / l of elemental sulfur (S°); (3) four liters of ULSD initially containing 0.5 mg / l total sulfur and 0 mg / l of S°; and (4) four liters of regular unleaded gasoline (RUL) initially containing 1.7 mg / l total sulfur and...

example 2

[0022] A 5% H2S in N2 mixture was bubbled through four liters of crude at 4 ft3 / hr for approximately one hour in order to replace any H2S that may have evolved from the original crude sample. The H2S / crude mixture was then recycled overnight at 10 cc / min through a 0.75″ OD×18″ long column of iron filings (˜40 mesh) to simulate the crude cycle in a pipeline. The packed bed of iron filings was used to simulate the pipeline wall effects. The column was then subjected to a series of refined products to simulate the product cycle in a pipeline. The following product cycle was tested: (1) 300 cc of ultra low sulfur diesel (ULSD) initially containing 0.5 mg / l total sulfur and 0 mg / l of elemental sulfur (S°); (2) 1 liter of MTBE initially containing 9.3 mg / l total sulfur and 0 mg / l of S°; (3) four liters of ULSD initially containing 0.5 mg / l total sulfur and 0 mg / l of S°; and (4) four liters of regular unleaded gasoline (RUL) initially containing 1.7 mg / l total sulfur and 0 mg / l of S°. The ...

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Abstract

A process for reducing the level of elemental sulfur and organic sulfur pick-up by refined hydrocarbon streams such as gasoline, diesel, jet fuel, kerosene or fuel additives such as ethers or iso-octane that are transported through a pipeline used to transport various sulfur-containing petroleum streams. The oxygen level in the hydrocarbon stream of interest to be pipelined as well as in at least the first hydrocarbon stream sequenced immediately ahead of the hydrocarbon stream of interest is reduced.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims benefit of U.S. Provisional Patent Application Ser. No. 60 / 587,916 dated Jul. 14, 2004.FIELD OF THE INVENTION [0002] This invention relates to a process for reducing the level of elemental sulfur and organic sulfur pick-up by refined hydrocarbon streams such as gasoline, diesel, jet fuel, kerosene or fuel additives such as ethers or iso-octane that are transported through a pipeline used to transport various sulfur-containing petroleum streams. The oxygen level of the hydrocarbon stream of interest to be pipelined as well as the oxygen level in at least the first hydrocarbon stream sequenced immediately ahead of the hydrocarbon stream of interest is reduced. BACKGROUND OF THE INVENTION [0003] It is well known that elemental sulfur in hydrocarbon streams, such as petroleum streams, is corrosive and damaging to metal equipment, particularly to copper and copper alloys. Sulfur and sulfur compounds may be present in v...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G31/00
CPCC10G29/28
Inventor FEIMER, JOSEPH L.
Owner EXXON RES & ENG CO
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