Method for measuring total acid value of jet fuel

A technology of jet fuel and determination method, which is applied in the field of analytical chemistry, can solve the problems of high price, poisonous toluene, and difficult purchase, and achieve the effect of safe method, high accuracy of result and good effect

Pending Publication Date: 2022-01-28
中国人民解放军空军勤务学院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although toluene-isopropanol-water titration solvent can better extract corrosive substances in jet fuel, toluene is poisonous and is a substance that is prone to poisonous and explosive production. It is strictly controlled, difficult to purchase, and expensive. limits its use to a certain extent

Method used

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  • Method for measuring total acid value of jet fuel
  • Method for measuring total acid value of jet fuel
  • Method for measuring total acid value of jet fuel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 A kind of assay method of total acid value of jet fuel

[0028] This embodiment includes the following steps carried out in sequence:

[0029] S1. Sample dissolution:

[0030] Take 100g of the No. 3 jet fuel sample and dissolve it in 100mL of 99% propanol aqueous solution (that is, the titration solvent) to obtain solution A;

[0031] S2. Sample titration:

[0032] Take solution A, feed nitrogen gas at a flow rate of 700mL / min, add 0.1mL of p-naphtholbenzene indicator with a concentration of 10g / L, and titrate to The orange color of the indicator fades, and the color changes suddenly to dark green. Record the amount of potassium hydroxide isopropanol standard titration solution V1 when the color changes, V1=0.54mL;

[0033] Blank group: Take 100mL of propanol aqueous solution with a volume fraction of 99%, feed nitrogen gas at a flow rate of 700mL / min, titrate with potassium hydroxide isopropanol standard titration solution until the color of the indicat...

Embodiment 2-6

[0039] The assay method of embodiment 2-6 jet fuel total acid value

[0040] Embodiment 2-6 is respectively a kind of assay method of total acid value of jet fuel, and their steps are basically the same as embodiment 1, and difference only lies in the difference of process parameter and test result, specifically see table 1:

[0041] Table 1 embodiment 2-6 technological parameters

[0042]

[0043] The detection result of above-mentioned embodiment shows, the jet fuel sample total acid value average value that the assay method of jet fuel total acid value of the present invention obtains is 0.0026mg KOH / g, and its precision repeatability is 0.0002mg KOH / g, less than GB / The 0.0006mg KOH / g stipulated in T12574-1990 Jet Fuel Total Acid Value Determination Method shows that the reliability of the measurement results meets the standard requirements.

Embodiment 7

[0044] The comparative experiment of the effect of the assay method of embodiment 7 jet fuel total acid value

[0045] In this embodiment, by comparing Example 1 of the present invention with three kinds of titration solvent components, the jet fuel total acid value determination method is respectively toluene+isopropanol+water, cyclohexane+isopropanol+water, isopropanol+water, Verify the assay effect of the method of the present invention.

[0046] Three kinds of titration solvents were used to measure the total acid value of jet fuel, the method is as follows:

[0047] S1. Sample dissolution:

[0048] Take the No. 3 jet fuel sample and dissolve it in 100mL of the corresponding titration solvent to obtain solution B; see Table 2 for the specific titration solvent ratio;

[0049] S2. Sample titration:

[0050] Take solution B, feed nitrogen gas at a flow rate of 700mL / min, add 0.1mL of p-naphtholbenzene indicator with a concentration of 10g / L, and titrate to The orange col...

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Abstract

The invention discloses a method for measuring the total acid value of jet fuel. The method comprises the following steps: dissolving a jet fuel sample to be measured in a propyl alcohol aqueous solution, introducing shielding gas, adding a titration indicator, performing titrating, recording the dosage of a standard titration solution, and calculating the total acid value of the jet fuel sample to be measured. According to the method, the propyl alcohol aqueous solution is used as the titration solvent, the effect of extracting the corrosive substances in the jet fuel is good, low toxicity, safety, economy, simplicity, rapidness and high result accuracy are achieved.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, and relates to the measurement of jet fuel acid value, in particular to a method for measuring the total acid value of jet fuel. Background technique [0002] Jet fuel, also known as aviation turbine fuel, is a light petroleum product obtained by refining and processing petroleum as raw material, and is widely used in aviation turbine engines. In the production process of jet fuel, some chemical substances are oxidized and easily form corrosive substances such as naphthenic acid, phenolic compounds, carboxylic acids and sulfides. During the storage, transportation and use of jet fuel, these corrosive substances will corrode, swell or ablate the contacted metal materials, rubber materials and coatings, which not only affect the oxidation stability and cleanliness of jet fuel itself It will also affect the service life of oil-using equipment. Therefore, the accurate determination of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79G01N1/28G01N1/38
CPCG01N21/79G01N1/28G01N1/38
Inventor 郝敬团陈腾马军孙元宝胡建强徐新姜旭峰费逸伟
Owner 中国人民解放军空军勤务学院
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