Light hydrocarbon desulfurization method

A light hydrocarbon, flow direction technology, applied in the direction of processing hydrocarbon oil, hydrocarbon oil treatment products, refining with alkaline aqueous solution, etc., can solve problems such as alkali elution desulfurization failure

Active Publication Date: 2017-07-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This part of dissolved oxygen will generate disulfides under the action of the catalyst during the re-contact process of the regenerated alkali liquor with the liquefied gas, and stay in the liquefied gas, which will cause the partial failure of the liquefied gas to elute sulfur

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Examples

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Embodiment 1

[0090] In this embodiment, the two-phase mixed reactor described in the present invention is used to carry out deep desulfurization of sulfur-containing light hydrocarbons, specifically as follows:

[0091] The liquefied petroleum gas containing mercaptan and the alkali solution contact in the alkali cleaning unit, and the mercaptan reacts with the NaOH in the alkali solution to form sodium mercaptide which is dissolved in the alkali solution. The liquefied gas discharged from the alkaline cleaning unit enters the settling unit and is separated from part of the alkali liquor entrained to complete the purpose of sweetening. The lye discharged from the settling unit enters the oxidation regeneration unit, and in the packed bubbling bed reactor, the lye reacts with air to convert sodium mercaptide into disulfide. The desulfurized lye discharged from the oxidation regeneration unit enters the back extraction unit, contacts with gasoline, removes the entrained disulfide, and obtain...

Embodiment 2

[0102] In this embodiment, the two-phase mixed reactor described in the present invention is used to carry out deep desulfurization of sulfur-containing light hydrocarbons, specifically as follows:

[0103] The method for light hydrocarbon desulfurization in this embodiment is similar to that in Example 1, and 19 mixing channels are also included in the two-phase mixed reactor, the difference is:

[0104] The light hydrocarbon in this example is light gasoline, and there is only one two-phase mixed reactor in the alkali washing unit and the stripping unit.

[0105] The selected light gasoline was obtained from Jiujiang Petrochemical, and its hydrocarbon volume percentage composition is shown in Table 2.

[0106] Table 2: Volume percentage composition of light gasoline hydrocarbons

[0107] n-paraffin / % Isoparaffin / % Olefin / % Diene / % C4 2.141 0.978 5.237 0 C5 13.368 41.388 29.821 0.039 C6 0 5.889 1.140 0

[0108] The total amount ...

Embodiment 3

[0114] In this embodiment, the two-phase mixed reactor described in the present invention is used to carry out deep desulfurization of light hydrocarbons, specifically as follows:

[0115] The method of light hydrocarbon desulfurization in the present embodiment is similar to that in embodiment 2, difference is:

[0116] In the alkaline cleaning unit: according to the flow direction of the alkali solution in the shell side of the reactor, the diameters of the distribution holes are 1mm, 0.7mm and 0.4mm respectively, the depth of the distribution holes is 1mm, and the distance between the centers of two adjacent distribution holes is the same. is 27mm. The cross-sectional area of ​​the mixing channel perpendicular to the light hydrocarbon flow direction is 6mm 2 , the length of the mixing channel is 1000mm. The temperature in the two-phase mixing reactor was 50° C. and the pressure was 1.2 MPa. The superficial flow velocity of light gasoline at the inlet of the mixing channe...

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Abstract

The present invention relates to the field of oil refining, and discloses light hydrocarbon desulfurization method, which is performed in a system containing an alkali washing unit, and comprises that an alkali liquid is introduced into a reactor shell side from the dispersed phase inlet of a two-phase mixing reactor, enters a mixing flow channel through distribution holes, and contacts a light hydrocarbon, wherein the light hydrocarbon is introduced into the mixing flow channel sequentially through a reactor inlet and a mixing flow channel inlet, and the flowing direction of the alkali liquid in the reactor shell side is opposite to the flowing direction of the alkali liquid in the mixing flow channel; and the mixture obtained after the contact of the alkali liquid and the light hydrocarbon is led out of the two-phase mixing reactor sequentially through a mixing flow channel outlet and a reactor outlet. According to the present invention, by using the two-phase mixing reactor, the sulfur-containing light hydrocarbon and the alkali liquid flow in the mixing flow channel at the high speed and are mixed vigorously, the mass transfer resistance is low, the acidic sulfur-containing substance in the sulfur-containing light hydrocarbon completely reacts with the alkali liquid, the deep desulfurization of the sulfur-containing light hydrocarbon is achieved, and the acidic sulfur-containing substance removal rate is more than 90%.

Description

technical field [0001] The invention relates to the field of oil refining, in particular to a method for desulfurizing light hydrocarbons. Background technique [0002] Light hydrocarbons such as crude liquefied gas (mainly C4 hydrocarbons) and light gasoline (mainly C5 hydrocarbons) produced by refineries contain a large amount of acidic sulfur-containing substances (mainly hydrogen sulfide and mercaptans). method to remove acidic sulfur-containing substances. [0003] Sweetening of mercaptans is an important step in the refining process of liquefied gas. The commonly used alkaline cleaning method for liquefied gas desulfurization in industry is to contact liquefied gas with lye containing excess NaOH, so that mercaptan and NaOH react to form sodium mercaptide, which is dissolved in lye to remove liquefied gas thiols in. [0004] The lye containing sodium mercaptide needs to be regenerated to remove the contained sodium mercaptide. The method of lye regeneration is gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G19/02C10L3/10
CPCC10G19/02C10G2400/06C10G2400/26C10L3/103
Inventor 唐晓津黄涛秦娅王子军
Owner CHINA PETROLEUM & CHEM CORP
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