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Removal of naphthenic acid in oil using composite deacidifying agent

A compound deacidification agent, deacidification agent technology, applied in the petroleum industry, refined hydrocarbon oil, etc., can solve the problems of difficult recycling of naphthenic acid chemical raw materials, affecting oxidation stability, etc.

Inactive Publication Date: 2006-10-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the simple use of organic basic compounds such as alcohol amines, a large amount of basic nitrogen will be introduced into the oil when removing naphthenic acid in high-acid value oils, which will seriously affect the oxidation of lubricating oils. stability
[0005] In US 4752381, monoethanolamine is used to react with naphthenic acid in oil to generate ammonium salt of naphthenic acid, and then at a certain temperature, the ammonium salt of naphthenic acid is converted into amide, except that alkali nitrogen will be introduced into the oil , which also makes naphthenic acid, an important chemical raw material, difficult to recycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment l

[0010] Take 0.1g NaOH, dissolve it in 10ml of ethanolamine and methylimidazole (v:v=1:1) mixed solution (containing 1% water), then add 50ml of ethanol to it, stir well to make it completely dissolve as deacidification agent. Take 1800ml of second-line dewaxed oil from a refinery, its acid value is 0.9mgKOH / g, and its basic nitrogen content is 181ppm. Mix according to the agent-oil ratio of 1:30, fully mix and react at 60°C for 60 minutes. After the reaction was completed, it was kept at 60° C. for 30 minutes, and the reactant was divided into two phases. Wherein the upper phase is an oil phase with reduced acid value. The acid value is 0.13mgKOH / g, the deacidification rate is 85.6%, and the basic nitrogen content is 211ppm, which is not significantly improved compared with that before deacidification. The lower phase is a complex deacidification agent phase enriched in naphthenic acid, and solvents such as ethanolamine, methylimidazole, and ethanol can be recycled by vacuum...

Embodiment 2

[0012] Take the third-line dewaxed oil from a certain refinery, its acid value is 1.3mgKOH / g, and its basic nitrogen content is 220.9ppm. Use the compound deacidifying agent prepared in the above example, the ratio of agent to oil is 1:15, fully stir and react at 70°C. After the reaction was completed, it was kept at the same temperature for 30 minutes. The upper layer is the oil after deacidification, the acid value is 0.2mgKOH / g, the deacidification rate is 84.6%, the alkali nitrogen content is 254.7ppm, and the alkali nitrogen content has not been significantly increased. The lower layer is a complex deacidification agent phase enriched in naphthenic acid, and various solvents can be recycled by distillation under reduced pressure, and crude naphthenic acid can be obtained at the same time.

Embodiment 3

[0014] Take dewaxed oil from a certain refinery minus four lines, its acid value is 1.7mgKOH / g, and its basic nitrogen content is 269.5ppm. Use the compound deacidification agent prepared in the above example, the ratio of agent to oil is 1:10, and fully stir the reaction at 80°C. After the reaction was completed, it was kept at the same temperature for 30 minutes. The upper layer is the oil after deacidification, the acid value is 0.16mgKOH / g, the deacidification rate is 90.6%, the alkali nitrogen content is 304.9ppm, and the alkali nitrogen content has not been significantly increased. The lower layer is a complex deacidification agent phase enriched in naphthenic acid, and various solvents can be recycled by distillation under reduced pressure, and crude naphthenic acid can be obtained at the same time.

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Abstract

The invention relates to a new method to deprive naphthenic acid from oil product. It adopts alcohols as solvent and thinner, the mixture of alkali organic substance like imidazole and alkylol amine as main deacidification agent and little quantities of inorganic alkali as deacidification additive. The ternary compounding deacidification agent mixes with oil product according 1:1-1:30 under 10-100 degree centigrade to form ion liquid compound to take rapid separation with oil material. The oil material phase would gain qualified oil product after taking refining, and the ion liquid compound could recycle raw naphthenic acid and deacidification agent. The invention could obviously decrease the intake of basic nitrogen, and improve the yield and quality of oil product. And it has simple technology, mild condition, low cost, etc.

Description

[0001] Field of the invention: the present invention relates to the field of petrochemical industry, the removal of naphthenic acid in oil products. Background of the invention: [0002] Naphthenic acid is a mixture of carboxylic acids with five-membered or six-membered rings, and its molecular weight is mostly between 200 and 700. It is a viscous liquid that is relatively difficult to volatilize. Naphthenic acid is one of the 87 kinds of chemical raw materials that are in short supply in China. Naphthenic acid and its various metal salts are mainly used in petroleum product additives, paint drier, catalyst, surfactant, etc., and are very important chemical raw materials. Versatile and great value. However, the existence of naphthenic acid has a serious impact on the refining and processing of distillate oil. For example, when processing and refining oil products with high acid value, the rectification tray, heat exchanger and pipeline are in danger of being corroded and perfo...

Claims

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Application Information

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IPC IPC(8): C10G29/20
Inventor 张锁江于英豪张香平刘军李增喜
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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