Method for decreasing sulfur content of distillate

A technology for distillate oil and sulfur content, which is applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc. It can solve the problems of complex process, short oil agent contact time, low sulfide content, etc. The process is simple and easy to implement Effect

Inactive Publication Date: 2006-09-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the commonly used process to reduce the sulfur content of FCC gasoline is hydrotreating. It is an effective method, but it needs to rebuild the device and hydrogen, which will inevitably lead to very expensive investment and operation costs.
It is also possible to add desulfurization aids in the FCC process to decompose thiophene sulfur and its derivatives in FCC gasoline to generate H 2 S gas can achieve the effect of reducing the sulfur content of gasoline; this method does not require a large amount of capital investment, is flexible in operation, and is easy to implement in refineries. The content of sulfide is very low, and sulfide is at a disadvantage in the competitive adsorption with a large amount of hydrocarbons, so it is difficult to remove sulfide to a higher degree
In addition, there are processes such as oxidative desulfurization, adsorption desulfurization, and biological desulfurization, but these methods are either complicated in process, high in energy consumption, or still in the laboratory stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the 250ml three-neck flask that has thermometer, reflux condenser and magnetic force stirrer, add 100ml raw material oil (Cangzhou Refinery FCC gasoline, sulfur content is 1340ppmw), 1g NH 4 Cl, 2g 40% HCHO and 5ml methanol. Heat to 65°C with stirring and keep for 1h. Stop heating and stirring, and condense to room temperature. Add 20ml of water into the flask, stir for 10min, then separate the liquid, pour the upper oil phase back into the three-necked flask, and repeat the washing twice.

[0020] There is no change in the composition of the raw oil before and after the reaction (see Table 1). Table 1 shows the change of the composition of the distillate before and after the reaction. It can be seen that the composition remains basically unchanged.

[0021] The yield was 99.5% by weight.

[0022] The product sulfur content was 415 ppmw. The desulfurization rate was 69% by weight.

[0023] n-alkanes

Embodiment 2

[0025] To have thermometer, add 100ml stock oil (with embodiment 1) in the 250ml there-necked flask of reflux condenser and magnetic stirrer, 2g NH 4 Cl, 5g of 40% HCHO and 20ml of water. It was heated to reflux under stirring (at this time, the reaction temperature was about 75°C) and kept for 2h. Stop heating and stirring, and condense to room temperature. Add 20ml of water into the flask, stir for 10min, then separate the liquid, pour the upper oil phase back into the three-necked flask, and repeat the washing twice.

[0026] The yield was 99.8% by weight.

[0027] The product sulfur content was 590 ppmw. The desulfurization rate was 56% by weight.

Embodiment 3

[0029] Add 100ml raw material oil (same as Example 1), 1g morpholine, 2g 40% HCHO and 0.01g NaOH in the 250ml there-necked flask with thermometer, reflux condenser and magnetic stirrer. It was heated to reflux under stirring (at this time, the reaction temperature was about 75°C) and kept for 2h. Stop heating and stirring, and condense to room temperature. Add 20ml of 3% by weight hydrochloric acid into the flask, stir for 10min, then separate the liquids, pour the upper oil phase back into the three-necked flask, and repeat washing twice with 20ml of water.

[0030] The yield was 99.0% by weight.

[0031] The product sulfur content was 563 ppmw. The desulfurization rate was 58% by weight.

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Abstract

The invention publishes a method to reduce sulfur in cut fraction oil. The characteristic of this invention is that meet the cut fraction oil with copmound containing amine salt or amino salt or ammonium salt and remove the basic amine sulfide by washing or distilling. The process is simple and easily actualized. Moreover, the desulfuration rate can be up to 50%(w) and recycling rate and octane number remain fundamentally unchanged.

Description

technical field [0001] The invention relates to a method for reducing the sulfur content of distillate oil. Background technique [0002] The purpose of removing sulfur compounds (such as hydrogen sulfide, mercaptan, thiophene, etc.) contained in the distillate and reducing the sulfur content in the distillate is to improve the odor of the oil, reduce corrosion and reduce air pollution after combustion. Generally, hydrogen sulfide can be removed by various alcohol amine methods, mercaptans can be removed by various deodorization methods, and other sulfur compounds are currently commonly removed by hydrogenation methods, and can also be removed by sulfuric acid refining and extraction methods. [0003] Taking gasoline in distillate oil as an example, the most important process for producing gasoline is fluid catalytic cracking (FCC). In my country, FCC gasoline accounts for more than 80% of the gasoline pool, and its sulfur content is above 1000 μg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/14
Inventor 刘中清谢文华宗保宁李明罡罗一斌舒兴田何鸣元
Owner CHINA PETROLEUM & CHEM CORP
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