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Petroleum product base number detection method, detection device and application thereof

A petroleum product and detection method technology, which is applied in the field of lubricating oil detection and evaluation, can solve the problems that mathematical measurement cannot accurately determine the titration end point, engine oil titration, etc., and achieve the effect of good automation and high detection accuracy

Inactive Publication Date: 2020-09-25
GUANGZHOU MECHANICAL ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the different additives added to the engine oil, the method of perchloric acid titration cannot make all engine oil titration curves with obvious jump points
A considerable part of the titration curve of petroleum products is flat, even if there is a titration end point in the chemical sense, the titration end point cannot be accurately determined from the mathematical measurement

Method used

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  • Petroleum product base number detection method, detection device and application thereof
  • Petroleum product base number detection method, detection device and application thereof
  • Petroleum product base number detection method, detection device and application thereof

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Embodiment 1

[0042] An embodiment of the present invention provides a method for detecting the base value of petroleum products, which includes the following steps.

[0043] (1) Materials and reagents

[0044] Automatic potentiometric titrator (burette and stirrer), non-aqueous pH electrode, 120mL acid and alkali resistant titration cup, molecular balance (accurate to 0.01mg), 0.1mol / L perchloric acid glacial acetic acid titrant and solvent (1 volume glacial acetic acid dissolved in 2 volumes of chlorobenzene).

[0045] (2) Potentiometric titration

[0046] Potential calibration of the non-aqueous pH electrode: Place the activated non-aqueous electrode in certified buffer solutions of pH4, pH7 and pH11 for potential calibration, and the accurate potential can be obtained by automatic calibration of the automatic potentiometric titrator.

[0047] Select the petroleum product to be tested for potentiometric titration, set the titration end point to a pH of -5, obtain the volume V of the titr...

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Abstract

The invention discloses a petroleum product base number detection method, a detection device and application thereof. The invention relates to the technical field of lubricating oil detection and evaluation. Specifically, in the detection method, a titration end point of a petroleum product is set at a pH value of -4.5 to -5.5 and at a potential value of 620-680mv, and under the condition that extra test steps and extra reagents do not need to be added, according to the volume of a titrant used when the petroleum product reaches a fixed titration end point, the base value of the petroleum product can be accurately calculated even for a petroleum product of which the end point of an inflection-free titration curve cannot be accurately judged. The method has the advantages of higher detection accuracy and higher automation degree.

Description

technical field [0001] The invention relates to the technical field of lubricating oil detection and evaluation, in particular to a detection method for the alkali value of petroleum products, a detection device and an application thereof. Background technique [0002] In lubricating oil fault diagnosis, the base number is one of the very important measurement standards, and the daily inspection needs to measure the operation of the engine equipment according to the size of the base number. A basic component in petroleum products, such as organic bases, inorganic bases, ureido compounds and polybasic salts, can be determined by potentiometric titration. [0003] However, due to the different additives added to the engine oil, the method of perchloric acid titration cannot make all engine oil titration curves with obvious jump points. Quite a few petroleum products have flat titration curves. Even if there is a titration endpoint in a chemical sense, the titration endpoint c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N27/26
CPCG01N31/16G01N27/26
Inventor 贺石中张静茹庞晋山石新发丘晖饶张琳颖邓新王永安车超萍朱懋冠谢静韦琪玲
Owner GUANGZHOU MECHANICAL ENG RES INST
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