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Sweetening of sour crudes

A crude oil, sulfur removal technology, applied in the petroleum industry, refining hydrocarbon oil, refining by heating/cooling, etc., can solve the problems of insufficient hydrogen source and excess hydrogen

Inactive Publication Date: 2006-08-16
TEXACO DEV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the recent desire to process hydrocarbons with higher sulfur concentrations has led to the need for more hydrogen to process hydrocarbons in this way
Hydrogen sources readily available in refineries may therefore not be sufficient for hydrodesulfurization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: H of crude oil 2 S emissions

[0027] A series of measurements were performed to better understand the different H 2 The chemistry of S formation, measured by evaluating H in various sour 'E' crude oil samples 2The tail gas concentration of S is carried out. Each sample is taken at the parallel sampling valve in the field and transported to the laboratory in a sample container. Upon receipt, the crude oil is analyzed for various components, including carbon and sulfur species.

[0028] sample 1

sample 2

sample 3

Sample 4

Sample 5

C% / S%

79.9 / 4.74

82.7 / 3.95

78.9 / 5.21

75.3 / 4.51

83.2 / 3.95

Initial H 2 S reading

<25ppm

>500ppm

>500ppm

>500ppm

>500ppm

100°F (38°C), 2 hours

>500ppm

>500ppm

>500ppm

>500ppm

>500ppm

100°F (38°C), 13 days

<20ppm

>500ppm

>500ppm

>500ppm

>500ppm

100°F (38°C), 42 days

<20ppm

...

Embodiment 2

[0031] Embodiment 2: hot dip autoclave test

[0032] A limited number of autoclave tests were performed to determine the effect of heat treatment on H 2 Effect of S formation / emission. h 2 The possible source of S is H dissolved in crude oil 2 S and / or H produced by reaction or decomposition of sulfur components 2 S. The purpose of running the experiments was to determine suitable thermal pretreatment conditions to condition the crude oil so that the H 2 S emissions are reduced or eliminated.

[0033] Heat treatment experiments generally include several categories, and these experiments can be divided into two stages. In the first stage, several identical crude oil samples were subjected to a wide range of heat treatment conditions, varying the temperature and time span for each run. In the second stage, the effect of the heat treatment of the first stage on the subsequent H 2 The impact of S emissions. Most of these runs consisted of the two steps described in Tables...

Embodiment 3

[0038] Example 3: Polyalkylamine vs. H 2 Impact of S emissions

[0039] A sample of crude oil is reacted with several different chemical reagents, which are H 2 S theoretically possible stabilizer or accelerator. Place 10 grams of crude oil in a 125 ml glass bottle and flush with argon, said weight is accurate to mg. The vials were then spiked with varying amounts of different chemicals, typically 0.1 g or 1%, and an internal standard, 1 μL of D6-benzene. The bottle was then immediately sealed with a Teflon septum and heated to 150°C (302°F) for 2 hours. Samples were cooled to 40°C and reanalyzed by GC / MS. The vapor above 0.1 ml of liquid crude oil was then withdrawn with a gas injector and injected directly into GC / MS for analysis. The emitted H 2 S was separated from light naphtha by chromatography, and compared with the internal standard D-6 benzene standard and 40ppm H 2 S external standard for measurement. In some cases, the temperature and reaction time can be va...

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PUM

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Abstract

The general object of this invention is to provide an improved process for sweetening and desulfurizing sulfur-contaniing crude oil streams. Heating the sulfur-containing crude oil stream to an elevated temperature for an extended period of time while stirring and bubbling an inert gas into the crude accelerates the removal of sulfur containing gases from the crude oil stream. Furthermore, the addition of a polyalkylamine to the stirred crude oil can also greatly assist in the expulsion of sulfur contaniing gases. 'After processing under these conditions, the hydrogen sulfide producing capacity of the crude oil s reduced significantly, thus making the crude safer for transportation and handling by reducing the health and environmental risks.

Description

Background technique [0001] Elemental sulfur and sulfur compounds occur naturally in many crude oils. Sulfur content varies widely; for example crude oil from West Texas contains about 0.2 wt% sulfur, while crude oil from Saudi Arabia contains about 5.0 wt% sulfur. Various sulfur compounds are also present in crude oil. These compounds range from hydrogen sulfide, which is in the gas phase at room temperature, to heavy sulfur compounds which are released at temperatures in excess of 1000°F (538°C). [0002] Sulfur compounds are disfavored because of their offensive odor and can be oxidized to corrosive sulfur dioxide or hydrogen sulfide. The corrosiveness of sulfur compounds significantly affects the construction, operation and maintenance costs of petroleum refineries. Sulfur compounds, if present in hydrocarbon products, can cause problems in gasoline engines and can contribute to a significant degree of environmental pollution. In addition, sour crude oil may produce hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G27/00C10G29/20C10G31/06
CPCC10G31/06
Inventor R·M·卡恩V·P·尼罗L·A·布鲁格S·J·德卡尼奥D·斯托姆
Owner TEXACO DEV CORP
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