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Process employing hydrogen to strip dissolved hydrogen sulfide from the liquid effluent of a petroleum distillate hydrotreater

a technology of hydrotreater and hydrotreater, which is applied in the field of stripping of hydrogen sulfide from the effluent of a petroleum distillate hydrotreater, can solve the problems of environmental and pollution problems, corrosion of pipes and vessels, and significant energy required for the circulation and heating of water to form steam

Inactive Publication Date: 2022-03-03
SAUDI ARABIAN OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a process for reducing sulfur in hydrocarbon products, specifically naphtha, kerosene, and diesel. The process involves hydrotreating the sulfur-containing feed, cooling and reducing the pressure of the liquid portion, stripping it with process hydrogen to remove dissolved hydrogen sulfide, and recovering a product with reduced sulfur content. The process can help to produce ultra-low sulfur products without further fractionation. The technical effects include improved fuel quality, improved refinery efficiency, and reduced emissions.

Problems solved by technology

The circulation and heating of the water to form steam requires a significant amount of energy and requires a capital investment in boiler and / or heat exchange devices, pumps and heaters.
Handling and pumping sour water through the system causes corrosion to pipes and vessels which are typically made of high alloy material.
The removal of waste water from the hydrotreating system has associated environmental and pollution problems, and additional equipment and energy are needed to treat the waste water for disposal.
Hydrogen stripping has no advantage when compared to steam stripping because the stripping hydrogen contaminated with H2S increases the volume of the gases that must be subjected to amine absorption.

Method used

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  • Process employing hydrogen to strip dissolved hydrogen sulfide from the liquid effluent of a petroleum distillate hydrotreater
  • Process employing hydrogen to strip dissolved hydrogen sulfide from the liquid effluent of a petroleum distillate hydrotreater
  • Process employing hydrogen to strip dissolved hydrogen sulfide from the liquid effluent of a petroleum distillate hydrotreater

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0052]In order to demonstrate the use and benefits of hydrogen stripping in accordance with the process of the present disclosure, a computer simulation employing Aspen HYSYS® V10.0 was conducted using a diesel stream containing 1.0 W % of sulfur as a feed to the hydrotreating zone to remove the sulfur.

[0053]Table 1 shows the mass balance and properties of the feedstream employed in the simulation included a diesel feed flow of 1.0 m3 / h and a hydrogen gas flow rate of 316 Sm3 / h providing a ratio of H2-to-oil for hydrotreating of 316 Sm3 / m3 of oil.

[0054]In the simulation, the hydrotreater and high-pressure separator units produced a stream, i.e., the cooled and low-pressure stream (158), that contains 2690 ppm of H2S. The effluent is introduced into the top of the stripper via a distribution device. Make-up hydrogen gas is injected into the bottom of the stripper via a conventional distribution manifold. The flow rate of make-up hydrogen stream (144) is determined by the consumption ...

example 2

[0055]In this Example, the ratio of make-up hydrogen flow-to-feed oil was varied from Example 1 in order to illustrate how the flow rate of H2 stripping gas affects the removal of dissolved H2S in the hydrotreated diesel product of the HYSYS simulation. The results are presented in Table 2. It can be seen that the lowest ratio of hydrogen stripping gas to liquid feed required to obtain a final product containing less than 1 ppm Wt of H2S is 15 Sm3 / m3 of oil.

TALBE 2Ratio of Flow of Make-up H2 to HydrotreatedLiquid Feed to Diesel H2Sstripper, Sm3 / m3content, ppmCaseof oilWtCase 151444.11Case 2 1027.49Case 3150.88Case 4200.063Case 5250.008Case 6300.001Case7353.07E−04Case 8408.42E−05Case 9452.68E−05Case 10509.59E−06

example 3

[0056]In this Example, Case 10 from Example 2, i.e., with a ratio of hydrogen stripping gas flow to liquid feed of 50 Sm3 / m3 was investigated to determine the impact of the number of theoretical plates required in order to obtain a final hydrotreated product containing less than about 1 ppm of dissolved H2S. As shown by the results in Table 3, the minimum number theoretical plates required is 4.

TABLE 3Number ofH2S Content inTheoretical Plates inHydrotreated Diesel,CaseStripping Columnppm WtCase 1232.88Case 234.01Case 340.49Case 450.06Case 560.007

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Abstract

The liquid hydrotreated effluent stream from a hydrotreating unit containing dissolved hydrogen sulfide downstream of a high-pressure separator is cooled and reduced in pressure to within a predetermined range before being stripped with process hydrogen to remove the dissolved hydrogen sulfide and recovering the effluent as the final product, the process being particularly suitable for hydrotreating naphtha, kerosene or diesel products to produce an ultra-low sulfur product without the need for further fractionation.

Description

BACKGROUND OF THE INVENTIONField of the Invention[0001]This invention relates to the stripping of hydrogen sulfide from the effluent of a hydrotreater.Description of Related Art[0002]It is known in the art that strict governmental regulations have been developed requiring reduction of the sulfur content in transportation fuels, including diesel, gasoline and jet fuel. Catalytic hydrotreating of the fuels is a widely applied process used by refineries to reduce organic sulfur to levels of 10 ppm, and below.[0003]Refinery distillates such as diesel from atmospheric distillation side cuts usually contain sulfur in the range of from 0.2 W % to 2.5 W %. In order to produce low-sulfur diesel, Hydrotreating the feed, for example by catalytic hydrogenation, can be carried out to remove sulfur and nitrogen heteroatoms. A trickle bed reactor loaded with a Co / Mo or Ni / Mo catalyst is commonly used for this type of hydrotreating to promote the desired desulfurization, denitrogenation and aromati...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G45/22
CPCC10G45/22C10G2300/207C10G2300/1055C10G2300/1051C10G2300/1044
Inventor MA, YOUSHAN
Owner SAUDI ARABIAN OIL CO
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