A method for removing mercaptans from light gasoline

A technology for light gasoline and sulfur removal, applied in the treatment of hydrocarbon oil, petroleum industry, hydrocarbon oil treatment products, etc., can solve the problems of difficult liquid/liquid system highly dispersed mixing, large equipment scale, low mass transfer coefficient, etc., to achieve The effect of increasing the contact area between phases, enhancing mass transfer and reaction, and improving desulfurization efficiency

Active Publication Date: 2020-05-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction tower is a continuous countercurrent equipment that can realize multiple theoretical levels of mass transfer and separation. However, its scale is relatively large, its operation is relatively complicated, and due to the slow material flow rate and low mass transfer coefficient, it is currently less use
CN102757809A discloses a method for removing hydrogen sulfide by pre-alkali elution with a static mixer. The static mixer has the smallest equipment scale and relies on two-phase high-speed flow to generate mixing for mass transfer, but the mixing structure of the static mixer is difficult to realize The liquid / liquid system is highly dispersed and mixed, so there is a bottleneck in its mass transfer efficiency. Currently, it is mostly used in processes that do not require high desulfurization such as hydrogen sulfide removal by pre-alkali elution of light hydrocarbons.
However, as mentioned above, conventional light gasoline desulfurization equipment is difficult to overcome the mass transfer resistance in the deep desulfurization process under the condition that the operating conditions are basically unchanged, and often cannot meet the requirements of light gasoline deep desulfurization

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  • A method for removing mercaptans from light gasoline
  • A method for removing mercaptans from light gasoline
  • A method for removing mercaptans from light gasoline

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Embodiment 1 adopts as attached figure 1 In the liquid-liquid extraction reactor shown, the reaction zone is a single reaction tube, and the effective cross-sectional area of ​​the circulation zone is twice the cross-sectional area of ​​the reaction zone. figure 1 shown. The diameter of the light phase separation zone is 1.6 times the outer diameter of the circulation zone, the vertical angle of the transition section is 30°, and the diameter of the heavy phase settlement zone is the same as that of the light phase separation zone. Hydrophilic coalescing packing is set in the light phase separation area, and the packing equivalent size is 6mm. image 3 shown. The residence time of the fluid in the light phase separation zone is about 50min. The lye is an aqueous sodium hydroxide solution with a mass fraction of 15%, which enters from inlet 1 as a continuous phase. Light gasoline raw material A is introduced from pipeline 3 as a dispersed phase, and the pressure diff...

Embodiment 2

[0051] The equipment used in embodiment 2 is attached figure 1 The liquid-liquid extraction reactor shown. Among them, the reaction zone is 7 reaction tubes, which are evenly and symmetrically arranged in the circulation zone, and the effective cross-sectional area of ​​the circulation zone is twice the total cross-sectional area of ​​the reaction zone. figure 2 shown. The diameter of the light phase separation zone is 1.6 times the outer diameter of the circulation zone, the vertical angle of the transition section is 30°, and the diameter of the heavy phase settlement zone is the same as that of the light phase separation zone. There are staggered baffles arranged in the light phase separation area, the inclination angle β is 20°, small holes are opened on the baffles, the diameter of the holes is 4mm, and the effective area of ​​the baffles is 0.6 times the total cross-sectional area of ​​the area. Figure 4 shown. The residence time of the fluid in the light phase sepa...

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Abstract

The invention provides a method for removing mercaptan from light gasoline. According to the method, light gasoline and alkaline liquor separately enter a liquid-liquid extraction reactor; mercaptan in the light gasoline reacts with alkali in the alkaline liquor and then enter the alkaline liquor; after completion of mass transfer and reaction of the above two phases, inter-phase separation is carried out; and the light gasoline without mercaptan enters a light-phase separating zone, the alkaline liquor enters a heavy-phase settling zone, and then the light gasoline without mercaptan and the alkaline liquor are separately discharged from the reactor; and the liquid-liquid extraction reactor comprises, from top to bottom, the light-phase separating zone (I), a reaction zone (III), a circular-current zone (II) and the heavy-phase settling zone (IV). The method for removing mercaptan from light gasoline strengthens mass transfer and reaction during extraction reaction; the removal rate ofmercaptan in gasoline can reach 95% or more; and the content of acidic mercaptan in light gasoline decreases to 5 ppm or below.

Description

technical field [0001] The invention relates to a method for removing mercaptans from hydrocarbon oils, more specifically, to a method for removing acidic mercaptans in light gasoline by using lye. [0002] technical background [0003] In the process of gasoline production in refinery, it is necessary to carry out refined processing such as desulfurization and olefin reduction on gasoline, so that the quality of gasoline can meet the emission standards of refined oil. When refining gasoline, gasoline is often cut into two parts, light gasoline and heavy gasoline, by fractional distillation, and then processed separately. The sulfur compounds in light gasoline are mainly acidic mercaptans, in addition to a small amount of neutral sulfur compounds, such as carbon disulfide, sulfide and thiophene. In industry, the acidic mercaptans in light gasoline are generally removed by alkali washing, so that the light gasoline after removal meets the emission requirements of sulfur conte...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C10G19/02
CPCC10G19/02C10G2300/104C10G2300/202C10G2400/02
Inventor黄涛袁清王雷毛俊义秦娅
OwnerCHINA PETROLEUM & CHEM CORP