Liquid gas sweetening alkali liquor oxidized regeneration method and apparatus

A regenerative device and liquefied gas technology, applied in chemical instruments and methods, separation methods, dispersion particle separation, etc., can solve problems that cannot be solved fundamentally, achieve reasonable and scientific process methods and structures, improve gas dispersion, The effect of emission reduction

Active Publication Date: 2009-02-25
NINGBO ZHONGYI PETROCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it cannot fundamentally solve the problem

Method used

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  • Liquid gas sweetening alkali liquor oxidized regeneration method and apparatus
  • Liquid gas sweetening alkali liquor oxidized regeneration method and apparatus
  • Liquid gas sweetening alkali liquor oxidized regeneration method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The liquefied gas with a feed rate of 35t / h is fed from the lower part of the extraction tower; the total sulfur content in the liquefied gas is 730mg / m 3 , of which mercaptan sulfur is 700mg / m 3 .

[0041] The lye with a feed rate of 8t / h is fed from the upper part of the extraction tower. The concentration of sodium hydroxide in the lye is 13%wt, the concentration of sodium mercaptide is 1.8% (calculated as sulfur), the concentration of disulfide is 820ppm (calculated as sulfur), and the concentration of sulfonated cobalt phthalocyanine as catalyst is 160ppm.

[0042] After most of the mercaptans are removed in the extraction tower, the liquefied gas passes through the water washing device. The total sulfur in liquefied gas is 87mg / m 3 , in which mercaptan sulfur is 9mg / m 3 .

[0043] The lye comes out from the bottom of the extraction tower, passes through the circulation cross-line and the pressure control regulating valve, 6t / h of which is pressurized by the l...

Embodiment 2

[0049] The liquefied gas with a feed rate of 35t / h is fed from the lower part of the extraction tower; the total sulfur content in the liquefied gas is 750mg / m 3 , of which mercaptan sulfur is 720mg / m 3 .

[0050] The lye with a feed rate of 8t / h is fed from the upper part of the extraction tower. The concentration of sodium hydroxide in the lye is 13%wt, the concentration of sodium mercaptide is 1.8% (calculated as sulfur), the concentration of disulfide is 800ppm (calculated as sulfur), and the concentration of sulfonated cobalt phthalocyanine as catalyst is 160ppm.

[0051] After most of the mercaptans are removed in the extraction tower, the liquefied gas passes through the water washing device. The total sulfur in liquefied gas is 83mg / m 3 , in which mercaptan sulfur is 12mg / m 3 .

[0052] The lye comes out from the bottom of the extraction tower, passes through the circulation cross-over line and the pressure control regulating valve, 6t / h of which is pressurized by...

Embodiment 3

[0059] The liquefied gas with a feed rate of 35t / h is fed from the lower part of the extraction tower; the total sulfur content in the liquefied gas is 710mg / m 3 , of which mercaptan sulfur is 685mg / m 3 .

[0060] The lye with a feed rate of 8t / h is fed from the upper part of the extraction tower. The concentration of sodium hydroxide in the lye is 13.1%wt, the concentration of sodium mercaptide is 1.8% (calculated as sulfur), the concentration of disulfide is 780ppm (calculated as sulfur), and the concentration of sulfonated cobalt phthalocyanine as catalyst is 160ppm.

[0061] After most of the mercaptans are removed in the extraction tower, the liquefied gas passes through the water washing device. The total sulfur in liquefied gas is 71mg / m 3 , of which mercaptan sulfur is 11mg / m 3 .

[0062] The lye comes out from the bottom of the extraction tower, passes through the circulation cross-over line and the pressure control regulating valve, 6t / h of which is pressurized ...

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Abstract

The present invention relates to a liquid gas sweetened alkali liquid oxygenating regeneration method. Sodium mercaptide in sweetened alkali liquid is transformed into sodium hydroxide and disulfide in air or oxygen-enriched air by catalyst to obtain regenerated alkali liquid after separation for recycling. The present invention is characterized in that a fraction of the sweetened alkali liquid is oxygenated and regenerated to obtain the regenerated alkali liquid which is mixed with the rest sweetened alkali liquid to be recycled into a sweetening reactor. The present invention also discloses a related device. The present invention has more reasonable technical method and structure, is very simple and easy for improving the traditional line and also has easy operation, easy implementation, low cost, good effect and outstanding economic benefit.

Description

technical field [0001] The patent of the present invention relates to a new process of oxidative regeneration of liquefied gas sweetening alkali solution. The sweetened lye oxidation regeneration process belongs to the product refining process in the field of petroleum and natural gas processing. Background technique [0002] In the refining process of liquefied petroleum gas, the mercaptans are usually removed through alkali washing process, so that the total sulfur content of liquefied petroleum gas can meet the requirements of national standards or internal control standards of enterprises. After alkali washing, the mercaptan in the liquefied gas reacts with sodium hydroxide to form sodium mercaptide, and the effective concentration decreases, requiring regeneration. The alkali slag produced by the alkali washing process (commonly known as the aqueous solution of sodium hydroxide rich in sodium mercaptide in industry) is usually regenerated by oxidation. Under the action...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/96
Inventor 聂通元王铭
Owner NINGBO ZHONGYI PETROCHEM TECH
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