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
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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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