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Method for refining naphthenic acid

A purification method and technology of naphthenic acid are applied in the field of decolorization and demetallization of naphthenic acid to achieve significant economic benefits and environmental protection effects, eliminate acid and emulsification problems, and facilitate operation.

Inactive Publication Date: 2004-12-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far there is no effective method for removing metal salts in naphthenic acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using an iron-cobalt colorimetric No. 18 industrial naphthenic acid with a crude acid value of 199.1mgKOH / g and a pure acid value of 232.5mgKOH / g as a raw material, the Φ3mm, 3-30mm, containing 40% pickled activated carbon, Put it into a 2.5×40cm reactor, adopt the flow mode of bottom in and top out, at a space velocity of 3hr -1 , refined at 50°C, received naphthenic acid equivalent to several times the volume of the adsorbent, and carried out quality inspections respectively. The quality of naphthenic acid obtained is shown in Table 1.

[0018] Refined multiples

Embodiment 2

[0020] The properties of the raw material of naphthenic acid to be refined: the iron-cobalt colorimetry is No. 12, the crude acid value is 225.8 mgKOH / g, and the pure acid value is 254.6 mgKOH / g;

[0021] Activated carbon: amorphous (flaky), size 10-40M;

[0022] Pickling type: sulfuric acid;

[0023] Activated carbon containing acid: 35%;

[0024] Fixed bed reactor: 2.5×40cm;

[0025] Feeding method: bottom in and top out;

[0026] Bed temperature: 60°C;

[0027] Liquid hourly space velocity: 4hr -1 ;

[0028] The property comparison of naphthenic acid before and after refining (100 times volume) is shown in Table 2.

[0029] Refined multiples

Embodiment 3

[0031] Still with the raw material of embodiment 2, add the said amorphous acid-containing activated carbon of embodiment 2 in naphthenic acid in the ratio of 10:1 by the weight ratio of naphthenic acid and activated carbon, heat to 50~60 ℃, stir 1 Hours, and then filtered with industrial filter paper while it was hot, and the properties of the filtrate, namely naphthenic acid, were determined. The results are shown in Table 3.

[0032] Refined multiples

[0033] It can be seen from Tables 1, 2, and 3 that the color of naphthenic acid is improved and the trace metal content in naphthenic acid is significantly reduced after being refined by pickling activated carbon.

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PUM

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Abstract

A process for refining naphthenic acid includes absorbing inorganic acid or micromolecular organic acid by activated carbon, contacting it with the naphthenic acid to be refined at 0-100 deg.C, and collecting the refined naphthenic acid. It can remove trace metals from raw naphthenic acid and decolor it.

Description

technical field [0001] The method of the invention is suitable for refining naphthenic acid, especially for decolorization and demetallization of petroleum naphthenic acid, especially for decolorization and demetallization of naphthenic acid which has been deoiled, degreased, refined and distilled. technical background [0002] Existing naphthenic acid refining methods mainly relate to deoiling (neither saponifiable matter), degreasing (both fatty acid), as disclosed in CN1101340 The purification and refining (deoiling) method of naphthenic acid is to use raw material crude naphthenic acid or two 1. After saponification of the third grade low acid value naphthenic acid, use solvent oil, gasoline or kerosene as the extractant to extract and separate the unsaponifiable matter in the saponified liquid, and obtain 100% first grade naphthenic acid product through vacuum distillation; CN1122323 has introduced a kind of method for removing fatty acid from petroleum naphthenic acid,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/487C10G17/04C10G17/06C10G17/07C10G17/095
Inventor 吴明清陶志平潘光成张红霞李涛冉国朋董伟张小云
Owner CHINA PETROLEUM & CHEM CORP