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Deep desulfurization method of sulfur-containing light hydrocarbon

A technology for deep desulfurization and light hydrocarbons, which is used in the treatment of hydrocarbon oil, hydrocarbon oil treatment products, and refining with alkaline aqueous solution. Effect

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

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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

Method used

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  • Deep desulfurization method of sulfur-containing light hydrocarbon
  • Deep desulfurization method of sulfur-containing light hydrocarbon
  • Deep desulfurization method of sulfur-containing light hydrocarbon

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 light hydrocarbon desulfurization method in this embodiment is similar to that in Example 1, and the two-phase mixed reactor also includes 11 groove structures, 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 of acid me...

Embodiment 3

[0114] 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:

[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 lye in the cavity unit, 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 27mm. The cross-sectional area of ​​the cavity unit perpendicular to the flow direction of lye is 280mm 2 , the cross-sectional area of ​​the mixing channel perpendicular to the flow direction of sulfur-containing light hydrocarbons is 6mm 2 , the length of the mixing channel is 1000mm. The temperature in the two-phase mixing reactor was 50° C. and the ...

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Abstract

The present invention relates to the field of oil refining, and discloses a deep desulfurization method of a sulfur-containing light hydrocarbon. The deep desulfurization method comprises that an alkali liquid is introduced into a cavity unit from the inlet of the cavity unit, enters a mixing flow channel through distribution holes, and contacts a sulfur-containing light hydrocarbon in the mixing flow channel, wherein the flowing direction of the alkali liquid in the cavity unit is opposite to the flowing direction of the alkali liquid in the mixing flow channel, and the sulfur-containing light hydrocarbon sequentially passes through the reactor inlet of a two phase mixing reactor and the inlet of the mixing flow channel and is introduced into the mixing flow channel; and the mixture formed after the contact of the alkali liquid and the sulfur-containing light hydrocarbon sequentially passes through the outlet of the mixing flow channel and the reactor outlet of the two phase mixing reactor and is led out of the two phase mixing reactor. The method of the present invention is particularly suitable for the deep desulfurization of the light hydrocarbon having the low acidic sulfur-containing substance content in the case of the low mass transfer driving force.

Description

technical field [0001] The invention relates to the field of oil refining, in particular to a method for deep desulfurization of sulfur-containing 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G19/02
CPCC10G19/02C10G2300/1092C10G2300/202C10G2400/06
Inventor 唐晓津黄涛秦娅王子军
Owner CHINA PETROLEUM & CHEM CORP
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