Process for treating oil by alkali washing

A technology of oil and alkali washing, applied in the field of salt or metal ion removal, petroleum acid in oil, can solve the problems of easy emulsification, long residence time, low deacidification efficiency, etc., to reduce acid value and short residence time , the effect of high deacidification rate

Active Publication Date: 2005-11-09
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for achieving high-efficiency mixing and simultaneous deacidification, desalination or metal ions in view of the shortcomings of the prior art, such as low deacidification efficiency, long residence time, easy emulsification, and the need for high-voltage electric field desalination

Method used

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  • Process for treating oil by alkali washing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Use a stainless steel filter membrane with a pore size of 20 μm as the dispersion medium, with an acid value of 1.84 mgKOH.g -1 The gasoline is the oil product system to be treated, and the caustic soda alcohol aqueous solution with a concentration of 3mol / L is the lye system, wherein the volume fraction of ethanol is 10%, and the volume flow ratio of the lye and the oil product is 1: 100, and the two phases are mixed The flow velocity along the surface of the dispersion medium is 1m / s, and the reaction time is 0.5s; the complete separation time of the two phases in the phase separator is 2min; the concentration of petroleum acid remaining in gasoline after phase separation is measured to obtain the deacidification rate 95.5%, lye utilization rate is 79%;

Embodiment 2

[0015] Use a stainless steel plate membrane with a pore size of 10 μm as the dispersion medium, with an acid value of 1.84 mgKOH.g -1 The gasoline is the oil product system to be treated, and the aqueous solution of caustic soda alcohol with a concentration of 0.8mol / L is the lye system, wherein the volume fraction of ethanol is 30%, and the volume flow ratio of lye and gasoline is 1: 25, and the two phases are mixed The flow velocity along the surface of the dispersion medium is 0.3m / s, and the reaction time is 1.67s; the complete separation time of the two phases in the phase separator is 2min; the concentration of petroleum acid remaining in gasoline after phase separation is measured to obtain the deacidification rate is 98%, and the lye utilization rate is 76%;

Embodiment 3

[0017] Use a stainless steel plate membrane with a pore size of 2 μm as the dispersion medium, with an acid value of 1.84 mgKOH.g -1 The gasoline is the oil product system to be treated, and the caustic soda alcohol aqueous solution with a concentration of 0.1mol / L is the lye system, wherein the volume fraction of ethanol is 50%, and the volume flow ratio of lye and gasoline is 1: 3, and the two phases are mixed The flow velocity along the surface of the dispersion medium is 2m / s, and the reaction time is 0.25s; the complete separation time of the two phases in the phase separator is 2min; the concentration of petroleum acid remaining in the gasoline after phase separation is measured to obtain the deacidification rate 97%, lye utilization rate is 73%;

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Abstract

A process for alkali washing of oil to remove acid, salt and metal ions features that the raw oil is washed by the alcohol solution of sodium hydroxide in a mixer which is divided into upper and lower layers by the dispersing medium. The alcohol solution of sodium hydroxide in upper layer is dispersed into microdrops by said dispersing medium and then reacts on the raw oil in lower layer. After separation, the pure oil is obtained.

Description

technical field [0001] The invention belongs to the technical field of petrochemical oil pretreatment, in particular to the technology for removing petroleum acid, salt or metal ions in oil. Background technique [0002] In the pretreatment process of oil products, alkali washing and water washing are usually required to remove petroleum acid, metals and water-soluble salts in oil products. For refined oil products such as gasoline and diesel oil, the petroleum acid in it has a corrosive effect on metals, causing premature damage to equipment; reducing the stability of oil products, causing oil products to oxidize to form colloids and sediments during storage; excessive acidity, Petroleum acid in crude oil is also easy to cause the emulsification of crude oil, so it must be deacidified and refined during processing; for crude oil, in addition to petroleum acid, it also contains a certain concentration of metal ions such as calcium, magnesium and nickel, etc., their existence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G19/02
Inventor 骆广生徐建鸿王玉军陈桂光李少伟
Owner TSINGHUA UNIV
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