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Method for measuring acid values of oil and products by using greening solvent based on potential jump

A green, petroleum acid technology, which is applied in chemical analysis by titration, analysis by chemical reaction of materials, and material analysis by observing the influence of chemical indicators, which can solve the problem of large error in results and lack of data. Comparability, difficulty in parallel and other problems, to achieve the effect of strong alkalinity, simple standard method, and elimination of limitations

Active Publication Date: 2012-09-05
CHINA PETROLEUM & CHEM CORP
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Problems solved by technology

[0056] To sum up, there are many standard methods for measuring the acid value of petroleum and petroleum products at home and abroad, so there are many problems caused by improper method selection, (1) the data of different methods are not comparable; (2) the standard methods indicate The manual judgment of the end point by the reagent method often has a large error in the result of oil products with a darker color or additives, and it is not easy to parallel; and the potentiometric titration method in the standard method uses highly toxic chemical reagents such as toluene and m-nitrophenol; (3) Some oil products have no sudden end phenomenon; (4) especially the current standard methods are incompletely dissolved for viscous oil products, which affects the repeatability and accuracy of the measurement results

Method used

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  • Method for measuring acid values of oil and products by using greening solvent based on potential jump
  • Method for measuring acid values of oil and products by using greening solvent based on potential jump
  • Method for measuring acid values of oil and products by using greening solvent based on potential jump

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Embodiment Construction

[0064] 1. Carry out a blank experiment first, take 90 mL of a 1:1 (vol.%) isooctane-isopropanol mixed solvent containing 0.05 mol / L methyldiethanolamine in a 150 mL dry beaker, and the titrant is 0.04952 mol / L Put the tetramethylammonium hydroxide (TMAH) standard solution into the titration stand of the potentiometric titrator, turn on the stirrer, set the appropriate titration parameters, start the "start" titration, and obtain the blank volume average value V through the potential jump. 0 is 0.135 mL. Then weigh 1.532g of old lubricating oil in a 150mL dry beaker, weighing to 0.001g, add 1:1 (vol.%) isooctane-isopropanol mixed solvent containing 0.05mol / L methyldiethanolamine 90mL, put it into the titration stand of potentiometric titrator, turn on the stirrer, set the appropriate titration parameters, start the "start" titration, automatically find the end point according to the potential jump, and consume 0.04952mol / L TMAH standard solution 0.751mL. Total acid value (AN) ...

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Abstract

The invention provides a method for measuring the acid values of oil by using a greening solvent based on potential jump, comprising the following steps of: adding an oil product with the mass of M to a clean beaker of 150mL, and dissolving the oil product in an non-toxic organic solvent, wherein the flowing oil product does not need to be dissolved; then adding an alcohol or isopropanol and alkane mixed solvent containing 0.05mol / L-0.2mol / L of alkaline reagents, placing on a titration platform of a potential titrator or an automatic sample rack, and titrating by using 0.02-0.1mol / L of organic-alkali alcohol standard solution when stirring to ensure that the titration end point is distinguished completely on the basis of potential jump; and calculating the total acid value of the oil product by consuming the volume and the concentration of the corresponding organic-alkali alcohol standard solution according to the standard method of GB / T 7304. In the method, the potential titration end point is distinguished completely on the basis of potential jump, and simultaneously the reagent is greened, therefore, the method has the advantages of automation of a measuring process, better result repeatability and higher accuracy.

Description

【Technical field】 [0001] The invention relates to a method for measuring petroleum acid value with a green solvent based on a potential jump, and belongs to the category of electrochemical analysis. 【Background technique】 [0002] Acid value is a necessary indicator of petroleum and petroleum products. Countries around the world, especially some developed countries and the International Organization for Standardization (ISO) have proposed a series of standard test methods for the acid value of petroleum and petroleum products. These methods are based on non- The principle of water acid-base titration is used to analyze the acid value of oil products. A large amount of toluene is used. The reagent is highly toxic and flammable. At the same time, the non-aqueous strong base titrant is more sensitive to carbon dioxide in the air, which is less than 0.1mg(KOH).g- 1 The acid value needs to be under the protection of nitrogen to have a more accurate result. According to the metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/80G01N31/16
Inventor 陆克平卢洪荣潘晓惠祝旭鸿
Owner CHINA PETROLEUM & CHEM CORP
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