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Method for determining acid value of oil product based on pH electrode and flow injection analysis combined technology

A technology of flow injection and oil products, which is applied in the direction of material analysis, material analysis, and measuring devices through electromagnetic means, can solve the problems of unsuitable dark oil products, etc., and achieve cheap equipment, low consumption of reagents, and methods simple and easy effects

Inactive Publication Date: 2014-06-25
JIANGNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that the combination of flow injection and photometry has been used to determine the acid value of oil[Tomomi Watanabe, Keiko Jyonosono, et al. Spectrometric flow injection analysis of the total base number and the total acid number in lubricants containing both acid and base compounds[J]. The Japan Society for Analytical Chemistry, 2003, 52(1):41-50; Panayotis G. Nouros, et al. Automated flow injection spectrophotometric non-aqueous tiricmetric detremination of the free fatty acid content of olive oil[ J]. Analytic Chimica Acta, 1997, 351:291-297], but still not suitable for the determination of dark oils

Method used

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  • Method for determining acid value of oil product based on pH electrode and flow injection analysis combined technology
  • Method for determining acid value of oil product based on pH electrode and flow injection analysis combined technology
  • Method for determining acid value of oil product based on pH electrode and flow injection analysis combined technology

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Effect test

Embodiment 1

[0029] Example 1 The titration of the acid value of automobile engine oil

[0030] Experiment method: Take the used engine oil and filter it with a 100-mesh sieve, then weigh 8.00g. After injecting into the flow injection system, carry out 5 parallel determinations (see image 3 ), the peak areas S are 2556747, 2583863, 2605642, 2653210, 2572588 respectively, and the average peak area is 2594410. Substituting into the linear equation S = -1257050logA+ 3427170, the calculated acid value A is 4.60mgKOH / g, R.S.D.=1.3%.

[0031] Conclusion: The acid value of the used oil for automobiles is calculated to be 4.60 mgKOH / g, and the relative standard deviation is 1.3%. This method can be used to determine the acid value of used motor oil in automobiles with excellent reproducibility. No indicators, no toxic organic reagents, no CO2 Interference, easy operation, simple instrument. And it is possible to link this system with a computer to realize automation and intelligence.

Embodiment 2

[0032] Example 2 Determination of Acid Value of Heating Boiler Heat Transfer Oil

[0033] Experimental method: Take 8.00g of superheated oil and inject it into the flow injection system. The measured peak area S average value is 2814589, and the calculated acid value A is 3.07 mgKOH / g.

[0034] Conclusion: The acid value of the used heat transfer oil is calculated to be 3.07 mgKOH / g. This method can be used to measure the acid value of the thermal conductivity oil of the heating boiler, without using indicators, without using toxic organic reagents, and avoiding CO 2 Interference, easy operation, simple instrument. And it is possible to link this system with a computer to realize automation and intelligence.

Embodiment 3

[0035] Embodiment 3 Determination of crude oil acid value

[0036] Experimental method: Take 8.00g of crude oil, after ultrasonication for 5min, inject it into the flow injection system, the measured peak area S is 2541345, and the calculated acid value A is 5.06mgKOH / g.

[0037] Conclusion: The acid value of the crude oil is calculated to be 5.06 mgKOH / g. This method can be used to determine the acid value of crude oil, without indicators, without using toxic organic reagents, and avoiding CO 2 Interference, easy operation, simple instrument. And it is possible to link this system with a computer to realize automation and intelligence.

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Abstract

The invention relates to a method for determining an acid value of an oil product based on a pH electrode and flow injection analysis combined technology, and belongs to the technical field of acid value determinations of heat conducting oil, lubricating oil, insulating oil, and other oil products. According to the method, the oil product is injected from the bottom of a KOH aqueous solution in an oil drop form; a neutralization extraction treatment is performed on the organic acid in the oil; the neutralized KOH aqueous solution is injected to a flow injection system; a pH electrode and flow injection analysis (ISE-FIA) combined technology is adopted to detect the concentration change of the KOH aqueous solution, and the acid value of the oil product is calculated. The method of the present invention has the following advantages that: the method is simple and easy to perform; the equipment is cheap, and can be connected with the computer to realize the automatic determination; no indicator is required; the amount of the reagent consumption is less; no toxic organic reagent is used; the process is not disturbed by CO2; the container pipeline is easy to clean; the method has good accuracy.

Description

technical field [0001] The invention belongs to a method for measuring the acid value of oil products by using a pH electrode combined with flow injection analysis technology, and the patent relates to the quality detection of oil products such as lubricating oil, heat conduction oil and insulating oil. technical background [0002] Acid value refers to the number of milligrams of potassium hydroxide required to neutralize the acidic components in 1g of oil, usually expressed in mgKOH / g. The acidic substances contained in oil products are mainly organic acids. Acidic substances are both inherent in the oil and produced under storage and use conditions. Measuring the acid value of oil, on the one hand, can judge the content of acidic substances in it, and then judge the corrosion ability of the oil to metal; The reaction shows the degree of deterioration of the oil, so the acid value is an important indicator of the quality of the oil. [0003] At present, my country's nat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/416
Inventor 宋启军李春阳张伯先
Owner JIANGNAN UNIV
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