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A method for oxidative desulfurization and sulfur recovery

A technology for sulfur recovery and oxidative desulfurization, applied in chemical instruments and methods, separation methods, sulfur preparation/purification, etc. Effect

Active Publication Date: 2016-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method does not completely solve the problems of tower plugging and foaming that have always existed

Method used

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  • A method for oxidative desulfurization and sulfur recovery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Removal of H 2 The reaction conditions at S are as follows: In the absorber: the temperature is 50°C, the reaction pressure is 0.6MPa, and the 2 The volume ratio of the hourly flow rate of S gas to complex iron desulfurization liquid is 15:1; in the mixer: the volume ratio of desulfurization liquid to oil phase (catalytically cracked diesel oil with a distillation range of 240~260°C) is 1:10, and the reaction The temperature is 60°C, and the reaction time is 50 minutes; in the solid-liquid separator: the temperature for cooling and separating sulfur is 10°C.

[0039]Composition of hydrogen sulfide-containing gas (volume): hydrogen sulfide content is 0.65%, SO 2 is 0.01%, COS is 0.01%; the concentration of Fe ions in the complex iron desulfurization solution is 0.06mol / L; after oxidative desulfurization of the desulfurization solution, the H in the gas is purified 2 S concentration is 15mg / m 3 , The purity of recovered sulfur is 98%.

Embodiment 2

[0041] Removal of H 2 The reaction conditions at S are as follows: In the absorber: the temperature is 60°C, the reaction pressure is 0.3MPa, and the 2 The volume ratio of the hourly flow rate of S gas to complex iron desulfurization liquid is 30:1; in the mixer: the volume ratio of desulfurization liquid to oil phase (catalytically cracked diesel oil with a distillation range of 260~300°C) is 1:5, and the reaction The temperature is 80°C, and the reaction time is 20 minutes; in the solid-liquid separator: the temperature for cooling and separating sulfur is 5°C.

[0042] Composition of hydrogen sulfide-containing gas (volume): hydrogen sulfide content is 0.18%, SO 2 is 0.1%, COS is 0.03%; the concentration of Fe ions in the complex iron desulfurization solution is 0.08mol / L; after oxidative desulfurization of the desulfurization solution, the H in the gas is purified 2 S concentration is 8mg / m 3 , The purity of recovered sulfur is 98.7%.

Embodiment 3

[0044] Removal of H 2 The reaction conditions at S are as follows: In the absorber: the temperature is 80°C, the reaction pressure is 0.1MPa, and the 2 The volume ratio of the hourly flow rate of S gas to complex iron desulfurization liquid is 1:8; in the mixer: the volume ratio of desulfurization liquid to oil phase (catalytically cracked diesel oil with a distillation range of 300~330°C) is 1:1, and the reaction The temperature is 100°C, and the reaction time is 10 minutes; in the solid-liquid separator: the temperature for cooling and separating sulfur is 15°C.

[0045] Composition of hydrogen sulfide-containing gas (volume): hydrogen sulfide content is 1.05%, SO 2 is 0.36%, COS is 0.27%; the concentration of Fe ions in complex iron desulfurization solution is 0.1mol / L; after oxidative desulfurization of desulfurization solution, the H in the gas is purified 2 S concentration is 10mg / m 3 , The purity of recovered sulfur is 98.6%.

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Abstract

The invention discloses an oxidative desulphurization and brimstone recycling method which comprises the following steps: a hydrogen sulfide-containing gas enters an absorber to be in contact with a doctor solution, and hydrogen sulfide reacts with the doctor solution to generate brimstone; purified gas is discharged from the top of the absorber; the brimstone-containing doctor solution enters a mixer to be mixed with an oil; the aqueous phase and the oil phase of the mixture are separated; the aqueous phase obtained after separation circulates to the absorber for recycling; the oil phase obtained after separation enters a solid-liquid separation device; cooling down is carried out to recycle brimstone; the oil phase circulates to the absorber. The method has the characteristics that the desulphurization efficiency is high; the brimstone separation effect is high; the operation is simple; the cost is low.

Description

technical field [0001] The invention relates to a gas purification method, in particular to a liquid-phase oxidation desulfurization and sulfur recovery method. Background technique [0002] LO-CAT complex iron desulfurization technology is a method of wet redox removal of sulfide using iron as a catalyst. It is characterized by non-toxic absorbent and the ability to remove H 2 S is transformed into elemental sulfur, H 2 The removal rate of S can reach more than 99%. Complex iron desulfurization technology is suitable for H 2 low concentration of S or H 2 Where the S concentration is high but the gas flow rate is not large. When the sulfur output is less than 20t / d, the equipment investment and operation cost of this process have obvious advantages. Alkali (Na 2 CO 3 or K 2 CO 3 ) in aqueous solution absorbs sulfide, H 2 S gas reacts with alkali to form HS - , through the reduction of high-valence Fe ions to low-valence Fe ions, the HS - converted to sulfur. Dur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/52C01B17/05
Inventor 刘淑鹤方向晨韩建华王学海陈玉香程明珠
Owner CHINA PETROLEUM & CHEM CORP
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