Method for oil-alkali separation of oil-containing alkali liquor

Abstract

A method for oil-alkali separation of oily lye is characterized in that the method includes the following steps in turn: oily lye undergoes primary separation through a standing precipitation device and then is fed into a cyclonic-type liquid-liquid separator for oil-alkali separation; the separated oil phase is fed into a special storing tank or other appropriate treatment device, thereby realizing recycling utilization of the lye. The method which has the advantages of high efficiency, low energy consumption, compact structure, convenience for operation and low consumption is suitable for oil-alkali separation of oily lye.

Description

technical field [0001] The invention relates to a method for oil-alkali separation, in particular to an oil-alkali separation method for reuse of disulfide-containing alkali liquor produced by the oxidation of petroleum liquefied gas demercaptan alkali liquor during petroleum processing. Background technique [0002] After desulfurization of petroleum liquefied gas, the mercaptide in the lye reacts with oxygen and water to form disulfide under the action of the catalyst. The lye may still contain 500 to 30000PPM (weight ratio) of disulfides, thereby affecting the effect of circulating lye for demercaptanization of liquefied petroleum gas. At present, the commonly used measures are to discharge lye regularly or irregularly and replenish fresh lye to reduce the concentration of disulfides in the circulating lye and maintain the sweetening effect. The discharge of lye directly leads to the waste of lye and catalyst, the increase of the load of the alkali slag treatment device,...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a high-efficiency, low-energy-consumption, compact-structur

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