Combination method and device of caustic sludge desulfuration and dephenolization neutralization and tail gas desulphurization processing

Abstract

The invention relates to a combination method and a device of caustic sludge desulfuration and dephenolization neutralization and tail gas desulphurization processing. The device comprises a caustic sludge oxidation desulfurization tower, a caustic sludge filter, a carbonization precipitation tank, a fiber liquid membrane contactor and a tail gas adsorption desulfurization tank, the top of the caustic sludge oxidation desulfurization tower is connected with a tail gas adsorption desulfurization tank through a tail gas discharging pipe one, the bottom of the caustic sludge oxidation desulfurization tower is connected with the caustic sludge filter through a caustic sludge discharging pipe, the caustic sludge filter is connected with the fiber liquid membrane contactor through a caustic sludge feeding pipe two, and the bottom of the fiber liquid membrane contactor is fixed on the carbonization precipitation tank through a flange; and the method includes subjecting the caustic sludge to oxidation treatment, air stripping fine taking off disulphide treatment and removing mechanical impurities ad colloids, separating hydrogen sulfide and mercaptan and adsorption desulfurization treatment successively. The combination method and the device of caustic sludge desulfuration and dephenolization neutralization and tail gas desulphurization processing have the advantages that disulphide of sodium sulphide and mercaptan sodium can be separated and recycled, and the tail gas after desulfuration can meet the relevant state standard requirements of direct discharge.

Description

technical field [0001] The invention relates to a combined method and device for alkali residue treatment and tail gas treatment, in particular to a combined method and device for oil desulfurization alkali residue desulfurization, phenol removal, neutralization and tail gas desulfurization. Background technique [0002] Gasoline, naphtha, aromatics, liquefied petroleum gas, etc. produced by refineries contain sulfur-containing impurities such as hydrogen sulfide and mercaptans. Each refinery has a large amount of alkali slag discharge. The alkali slag contains sodium hydroxide, sodium sulfide, sodium mercaptide, sodium phenate and trace light hydrocarbons. Its pH value is above 14 and its COD is as high as 200,000-600,000 mg / L. Toxic substances and foul smell cannot be sent to biochemical ponds for treatment, nor can they be sent to sewage treatment plants, otherwise it will seriously affect the normal operation of sewage treatment and affect the health of staff. [0003]...

AI Technical Summary

Problems solved by technology

But for the alkali slag whose sodium sulfide and sodium mercaptide content exceeds 5%wt, the oxidation ability is still insufficient; at the same time, the oxidation tail gas of the alkali slag contains 10000mg / m 3 The above disulfides have a foul smell and slight toxicity and cannot be discharged directly. They can only be sent to incineration. However, disulfides will generate sulfur dioxide during incineration, which will seriously corrode equipment and pipelines. If the sulfur dioxide generated is not desulfurized processing, seriously polluting the environment

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