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Fine desulfurize method for carbon four components of refinery

A refinery carbon 4 and fine desulfurization technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc. problem, to achieve the effect of increasing the anti-interference ability

Inactive Publication Date: 2008-08-27
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on the removal of carbonyl sulfide in C4 in the refinery shows that the same hydrolysis method and hydrolyzing agent used for C3 desulfurization are less effective, and the conversion rate of the same carbonyl sulfide hydrolyzing agent in propylene can reach more than 99%. However, the conversion rate of carbonyl sulfide in C4 in the refinery is only about 60%, and the conversion rate of carbonyl sulfide in C5 in the refinery is even lower, only about 40%.
[0009] The polarity of sulfide and disulfide is relatively weak, and it is difficult to convert into other sulfides. Especially for the fine desulfurization of C4 unsaturated hydrocarbons, the adsorption removal regeneration process is basically adopted in the world at present, and the adsorbent generally uses molecular sieve-based composite materials. , but for the water content and CO in the hydrocarbon feedstock 2 The content requirements are extremely strict, because water and CO 2 It is easier to be adsorbed on this type of adsorbent, causing the deactivation of the adsorbent and even the desorption of the adsorbed sulfide, and the abnormal phenomenon that the outlet sulfur of the desulfurization reactor is greater than the inlet sulfur
However, there are no related reports on adsorption desulfurization refining process and adsorbents for C4

Method used

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  • Fine desulfurize method for carbon four components of refinery
  • Fine desulfurize method for carbon four components of refinery
  • Fine desulfurize method for carbon four components of refinery

Examples

Experimental program
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Effect test

Embodiment 1

[0041] C4 raw material: normal temperature mixed C4 components from the refinery, the flow rate is about 12 tons / hour, and the total sulfur content is about 35mg / m 3 , where the COS content is about 21mg / m 3 , the content of methyl mercaptan is about 10mg / m 3 , the dimethyl disulfide content is about 3.7mg / m 3 , the content of thiophene is about 0.3mg / m 3 .

[0042] Desulfurization process: the mixed C4 raw material first enters two 3 The solid alkali crude stripping tower 1 of solid sodium hydroxide is used for crudely stripping sulfides such as carbonyl sulfide, mercaptan, sulfide, disulfide and thiophene in the mixed carbon four components. During the treatment process, the two towers can be operated intermittently; The mixed carbon four components after crude desulfurization enter into the interior 30m 3 The carbonyl sulfide adsorption reactor 2 of the carbonyl sulfide adsorbent absorbs and removes carbonyl sulfide and mercaptan in the mixed carbon four components; 3...

Embodiment 2

[0046] C4 raw material: butene-1 separated from petroleum liquefied gas in refinery, the flow rate is about 6 tons / hour, and the total sulfur content is about 11mg / m 3 , where the COS content is about 6.1mg / m 3 , the content of methyl mercaptan is about 3.9mg / m 3 , the content of ethanethiol is about 0.7mg / m 3 , the content of dimethylsulfide is about 0.3mg / m 3 .

[0047] Desulfurization process: Crude butene-1 enters the interior 15m 3 The solid alkali of massive potassium hydroxide is coarsely stripped tower 1, then enters and is equipped with 20m 3 The carbonyl sulfide adsorption reactor 2 of the carbonyl sulfide adsorbent finally enters the interior 20m 3 Fine desulfurization reactor 3 for fine desulfurizer.

[0048] The carbonyl sulfide adsorbent used in the above process is an adsorbent made of activated alumina impregnated with potassium salt, and the content of active component potassium (calculated as oxide) is about 8wt.%; the fine desulfurizer adopts activated...

Embodiment 3

[0051] C4 raw material: n-butane separated from petroleum liquefied gas in refinery, the flow rate is about 3 tons / hour, and the total sulfur content is about 8mg / m 3 , where the COS content is about 6mg / m 3 , the content of methyl mercaptan is about 1.2mg / m 3 , the dimethyl disulfide content is about 0.5mg / m 3 , the content of thiophene is about 0.3mg / m 3 .

[0052] Desulfurization process: n-butane enters the interior 10m 3 The solid alkali of blocky sodium hydroxide and potassium hydroxide mixture is rough off tower 1, then enters and is equipped with 10m 3 The carbonyl sulfide adsorption reactor 2 of the carbonyl sulfide adsorbent finally enters the interior 10m 3 Fine desulfurization reactor 3 for fine desulfurizer.

[0053] The carbonyl sulfide adsorbent is made of activated alumina impregnated with sodium salt, and the sodium content of the active component (calculated as oxide) is about 7wt.%. The refined desulfurization adsorbent is made of alumina impregnated w...

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Abstract

The invention relates to a method for fine desulphurization of C4 in a refinery, which comprises the following steps that: C4 is coarsely desulfurized through solid alkali in the refinery; the C4 coarsely desulfurized touches a carbonyl sulfur absorbent in the refinery and most of carbonyl sulfur and thiol in C4 are absorbed and removed; and C4 of the refinery touches a fine desulphurization absorbent again to absorb and remove the remaining sulfur. The total sulfur content of C4 in the refinery is reduced to less than 1mg / m<3> after C4 is finely desulfurized according to the method provided by the invention, thus meeting the requirement for C4 to be used as industrial raw material. The desulfurized C4 is free of impurity such as carbon dioxide and so on, so as not to influence subsequent processes. The fine desulphurization method provided by the invention achieves industrial production of desulphurization of C4 in the refinery, and ensures complex utilization of C4 in the refinery.

Description

technical field [0001] The invention relates to a technology for separating and purifying liquefied petroleum gas, in particular to a method for finely desulfurizing carbon four components in a refinery. Background technique [0002] High oil prices, government control of liquefied gas prices, and rapid expansion of enterprise production scale have brought about expansion of liquefied gas transportation radius and increased transportation costs; the rapid development of the coal chemical industry has gradually increased the share of dimethyl ether replacing liquefied petroleum gas. In addition, China's crude oil imports are becoming more and more diversified and inferior, all of which lead to a decline in the quality and production efficiency of petroleum liquefied petroleum gas. Therefore, the driving force for making full use of liquefied petroleum gas resources is getting stronger and stronger. The fine separation and purification of olefin components in petroleum gas, re...

Claims

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Application Information

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IPC IPC(8): B01D53/04B01D53/48
Inventor 周红军张文慧周广林
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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