CN104076130A - Method for quickly detecting content of insoluble water in jet fuel - Google Patents
Method for quickly detecting content of insoluble water in jet fuel Download PDFInfo
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- CN104076130A CN104076130A CN201410332291.4A CN201410332291A CN104076130A CN 104076130 A CN104076130 A CN 104076130A CN 201410332291 A CN201410332291 A CN 201410332291A CN 104076130 A CN104076130 A CN 104076130A
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- jet fuel
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Abstract
The invention discloses a method for quickly detecting the content of insoluble water in a jet fuel. The method comprises the following steps: at different temperatures, mixing water with the jet fuel, violently shaking, subsequently standing, layering and taking supernatant liquid for testing, and establishing a calculation formula I which expresses the variation of the content of soluble water in the jet fuel along with the change of the environment temperature according to a testing result; testing the content of the soluble water in the jet fuel under different environment humidities in a determined temperature range, and establishing a calculation formula II which expresses the variation of the content of the soluble water in the jet fuel along with the change of the environment humidity under different environment humidities according to the testing result, detecting the total water content T in a jet fuel sample to be detected, and calculating the content R of the soluble water in the jet fuel sample to be detected according to the formulas I and II so as to obtain a content F of insoluble water in the jet fuel sample to be detected, wherein F is equal to T minus R. The method has the advantages of short detection time, accurate detection result and small error and is suitable for field fast detection of the content of water in the jet fuel.
Description
Technical field
The present invention is specifically related to a kind of non-dissolved water content quick determination method in jet fuel, is applicable to the field quick detection of moisture in jet fuel.
Background technology
Jet fuel belongs to oils, multiple hydro carbons and arene material, consists of, and has certain water absorptivity, therefore, in storage, transportation, filling and use procedure, inevitably can sneak into moisture.Moisture is two states and exists in jet fuel: dissolved water and free water (non-dissolved water).When in fuel, non-dissolved water content surpasses certain threshold value, can directly have influence on the service property (quality) of oil product and the normal work of Flying device equipment, therefore by the dissolved water content in Accurate Determining jet fuel, be conducive to judge the non-dissolved water content in jet fuel, for guaranteeing that fuel usability and flight safety have great importance.
In jet fuel, the assay method of moisture is mainly divided into three major types at present: a class is ocular estimate, and the method measuring error is large, test data accuracy is not high; Another kind of is experimental determination method, comprise solvent reflux extraction and karl Fischer method, there is equally the shortcoming that measuring error is large, test data accuracy is not high in the former, although the latter's measurement result is accurate, repeatability better, but test set-up procedure is complicated, is not suitable for the moisture measurement in fast-field evaluation oil product; Last class is fluorometry, and the method technical requirement is high, and minute is long, is not suitable for the Site Detection of moisture in oil product.
And aforesaid three class assay methods all cannot be distinguished dissolved water and non-dissolved water content in oil sample, but not dissolved water content is the index that jet fuel chemical examination is paid close attention to the most.
Summary of the invention
For deficiency of the prior art, the object of the present invention is to provide a kind of non-dissolved water content quick determination method in jet fuel, it has easy and simple to handle, sampling is few, result is accurate, favorable reproducibility, and test is fast, the advantages such as error is little, are applicable to the field quick detection of moisture in jet fuel.
For realizing aforementioned goal of the invention, the present invention has adopted following technical scheme:
A non-dissolved water content quick determination method in jet fuel, comprising:
Under condition of different temperatures within the scope of the first design temperature, the water that volume ratio is greater than to 0.5:1 mixes with jet fuel, after thermal agitation, standing, layering, and get supernatant liquid and test, record the dissolved water content in jet fuel under condition of different temperatures, and the computing formula I that changes with environment temperature x of the dissolved water content y that is based upon described jet fuel within the scope of this first design temperature:
Y=e
a*x+Bformula I
Wherein, A=0.022, B=3.778;
Under varying environment humidity in the second design temperature scope and set environment humidity range, dissolved water content in jet fuel is tested, record the dissolved water content in jet fuel under different humidity condition, and be based upon the computing formula that the dissolved water content Y of described jet fuel in this second design temperature scope and this set environment humidity range changes with ambient humidity H:
Y=a+b*H ... formula II
Wherein, a=13.65, b=0.67;
And, measure the total liquid water content T in jet fuel sample to be measured, and calculate the dissolved water content R in jet fuel sample to be measured according to formula I and formula II, and then know the non-dissolved water content F in jet fuel sample to be measured, wherein, F=T-R.
Further, in described jet fuel, non-dissolved water content quick determination method comprises: adopt karl Fischer coulomb method to measure the dissolved water content in jet fuel or jet fuel sample to be measured.
Further, in described karl Fischer coulomb method, the described karl Fischer reagent adopting is mainly mixed to form by iodine, sulphuric dioxide, alcohols and organic base.
Preferably, described the first design temperature scope and the second design temperature scope are-10 ℃～50 ℃, are preferably 6 ℃～35 ℃.
Particularly, described the second design temperature scope is especially preferably 24 ℃～26 ℃.
Preferably, described set environment humidity range is 10%-100%, is preferably 36%～85%.
Compared with prior art, the present invention at least has the following advantages:
(1) the present invention has set up the relational expression that in jet fuel, moisture changes with environment temperature, humidity, can calculate easily under arbitrary temp, humidity thus, dissolved water content in jet fuel, and then can realize the field quick detection of aviation fuels quality, for determine in jet fuel non-dissolved water content provide a kind of fast, accurately, method reliably.
(2) detection method of the present invention fast, accurately, favorable reproducibility, detect data and have good preci-sion and accuracy, conform to moisture laboratory determination method the data obtained, whole test process completed in 2-5 minute, far less than traditional ocular estimate and laboratory method (1～2 hour detection time), can realize the fast detecting of aviation fuels under emergency case;
(3) the present invention can utilize common micro-water analyzer and realize test, simple to operate, do not need to carry out a large amount of complicated Preparatory work of experiment work, before test, do not need sample to carry out pre-service, and sample drawn amount is few, oil loss reduces, than traditional ocular estimate and solvent reflux extraction, laboratory personnel does not need to participate in pre-job training, can skillfully complete instrumentation, the moisture in Accurate Determining oil plant.
Accompanying drawing explanation
Fig. 1 be in the embodiment of the present invention 1 in jet fuel dissolved water content with the variation diagram of environment temperature;
Fig. 2 be in the embodiment of the present invention 2 in jet fuel dissolved water content with the variation diagram of ambient humidity.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is described in detail, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, belongs to the scope of protection of the invention.
Embodiment 1
The experimental apparatus and the reagent that in the present embodiment, adopt comprise: SC-3 micro-water analyzer, Zhonghui Instrument Co., Ltd.'s (based on work of karl Fischer coulomb method principle); Karl Fischer reagent, Zhonghui Instrument Co., Ltd.; No. 3 jet fuels (also claiming below oil plant), commercially available approach obtains (meeting No. 3 jet fuel > > index requests of GB6537-94 < <).
The implementation process of the present embodiment is as follows:
First, application SC-3 type micro-water analyzer detects the moisture in No. 3 jet fuel samples (being called for short as follows sample), for the impact of deaeration humidity on moisture in sample, in advance sample is carried out to pre-service, specifically comprise following operation: according to volume ratio 1:1, in sample, add pure water, standing 48 hours above (environmental test atmospheric humidity 100%), the water cut in working sample.Under varying environment temperature conditions, the testing result of moisture (condition of different temperatures is done respectively 5 parallel experiments, averages) as shown in table 1 in No. 3 jet fuels.Further, in this oil plant, moisture variation with temperature trend is as shown in Figure 1.
Can find out, in the scope of temperature-10 ℃～50 ℃, in No. 3 jet fuels, dissolved water content raises and is approximately linear and increases with temperature, and variation tendency is stable, moisture (mg/L) with environment temperature (℃) variation relation formula is:
y＝e
A*x+B
Wherein A, B-coefficient (A=0.022, B=3.778); X-environment temperature.
The impact of table 1 environment temperature on No. 3 jet fuel water content detection results
Secondly, the temperature that controls environment is at-10 ℃-50 ℃, utilize equally SC-3 type micro-water analyzer to measure the moisture in lower No. 3 jet fuels of varying environment humidity, the result (different humidity condition is done respectively 5 parallel experiments, averages) as shown in table 2 of detection.In oil plant, moisture with the variation tendency of humidity as shown in Figure 2.
Can find out, along with ambient humidity increases (ambient humidity 10%～100%), in No. 3 jet fuels, dissolved water content is linear growth, and dissolving moisture Y (mg/L) with the variation relation formula of ambient humidity H (%) is:
Y=a+b*H ... formula II
Wherein a, b-coefficient (a=13.65, b=0.67); H-ambient humidity.
The impact of table 2 ambient humidity on No. 3 jet fuel water content detection results
Finally, separately get 3 groups of No. 3 jet fuels as testing sample, 20 ℃ of the temperature that controls environment, humidity 34%, utilize respectively total moisture content (T) in working sample of micro-water analyzer, then the impact on dissolved water content in sample according to environment temperature and ambient humidity, calculate under this environmental baseline dissolved water content (R) in sample, and then obtain non-dissolved water content (F), i.e. F=T-R in sample.Every group of sample done 3 parallel laboratory tests, averages, and testing result and Fluorometric assay result are compared, shown in testing result table 3.
Non-dissolved water content detection result in table 3 No. 3 jet fuels to be measured
According to the karl Fischer coulometry (also claiming Ka Shi coulometry) described in table 3 testing result demonstration fluorescence method and the present embodiment, can detect the content of non-dissolved water in No. 3 jet fuels, the two testing result is basically identical, the method described in the present embodiment of illustrating can realize non-dissolved water content in sample fast, Accurate Determining.
In addition, this case inventor, also according to the mode identical with embodiment 1, tests the non-dissolved water content in 1,2,4,5, No. 6 jet fuel, also can obtain basic identical testing result.
It will be appreciated by those skilled in the art that above-described embodiment only illustrative principle of the present invention and effect thereof, but not for limiting the present invention.Any person skilled in the art scholar all can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, such as in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (5)
1. a non-dissolved water content quick determination method in jet fuel, is characterized in that comprising:
Under condition of different temperatures within the scope of the first design temperature, water by volume ratio more than 0.5:1 mixes with jet fuel, after thermal agitation, standing, layering, and get supernatant liquid and test, record the dissolved water content in jet fuel under condition of different temperatures, and the computing formula I that changes with environment temperature x of the dissolved water content y that is based upon described jet fuel within the scope of this first design temperature:
Y=e
a*x+Bformula I
Wherein, A=0.022, B=3.778;
Under varying environment humidity in the second design temperature scope and set environment humidity range, dissolved water content in jet fuel is tested, record the dissolved water content in jet fuel under different humidity condition, and be based upon the computing formula that the dissolved water content Y of described jet fuel in this second design temperature scope and this set environment humidity range changes with ambient humidity H:
Y=a+b*H ... formula II
Wherein, a=13.65, b=0.67;
And, measure the total liquid water content T in jet fuel sample to be measured, and calculate the dissolved water content R in jet fuel sample to be measured according to formula I and formula II, and then know the non-dissolved water content F in jet fuel sample to be measured, wherein, F=T-R.
2. non-dissolved water content quick determination method in jet fuel according to claim 1, is characterized in that comprising: adopt karl Fischer coulomb method to detect the dissolved water content in jet fuel or jet fuel sample to be measured.
3. non-dissolved water content quick determination method in jet fuel according to claim 2, is characterized in that, in described karl Fischer coulomb method, the described karl Fischer reagent adopting is mainly mixed to form by iodine, sulphuric dioxide, alcohols and organic base.
4. non-dissolved water content quick determination method in jet fuel according to claim 1, is characterized in that described the first design temperature scope and the second design temperature scope are-10 ℃～50 ℃.
5. according to non-dissolved water content quick determination method in jet fuel described in any one in claim 1-4, it is characterized in that described set environment humidity range is 10%～100%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932317A (en) * | 2017-03-14 | 2017-07-07 | 中国人民解放军空军勤务学院 | A kind of non-dissolving water content on-line measuring device and detection method of jet fuel |
| CN106990105A (en) * | 2017-05-11 | 2017-07-28 | 中国民用航空总局第二研究所 | Test paper of Aviation Fuel micro-water content and preparation method thereof |
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|---|---|---|---|---|
| CN106932317A (en) * | 2017-03-14 | 2017-07-07 | 中国人民解放军空军勤务学院 | A kind of non-dissolving water content on-line measuring device and detection method of jet fuel |
| CN106990105A (en) * | 2017-05-11 | 2017-07-28 | 中国民用航空总局第二研究所 | Test paper of Aviation Fuel micro-water content and preparation method thereof |
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| CN104076130B (en) | 2015-07-29 |
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