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Method for determining moisture content in oil product

A technology for oil products and reclaimed water, which is applied in the field of analysis and detection, can solve the problems that the water content of oil samples containing heavy oil cannot be measured, the water content of heavy oil products cannot be detected, and the measurement time is long. Detection efficiency, saving waiting time for unloading, and efficiency improvement

Pending Publication Date: 2021-05-28
CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for detecting the moisture content in the oil product in order to overcome the problems that the distillation method existing in the prior art takes a long time and the Karl Fischer method cannot detect the moisture content in the heavy oil product. The range of water content determined by the Karl Fischer method solves the problem that the Karl Fischer method cannot determine the water content in oil samples containing heavy oil

Method used

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  • Method for determining moisture content in oil product
  • Method for determining moisture content in oil product
  • Method for determining moisture content in oil product

Examples

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Embodiment 1

[0069] This embodiment is used to illustrate the assay method of water content in the oil product of the present invention

[0070] Methanol and dimethylformamide (DMF) were used as solvents to determine the water content in oil samples 1-3. Wherein, the volume ratio of methanol and DMF is 7.5:2.5, 7:3, 6:4, 4:7 and 3:7, and the total volume of methanol and DMF is 25mL.

[0071] Specifically, the water content of the oil samples 1-3 was determined sequentially according to the direct coulometric titration method in GB / T 6283-2008. Wherein, weigh 2g of oil product sample and add the sample in the titration bottle to weigh up to 0.0001g, titrate to the end point with Karl Fischer reagent, and record the number of milliliters of Karl Fischer reagent consumed. Set up a blank test, no sample is added during the test, and the time to open the cap of the titration bottle is the same as the time to open the cap of the measured sample.

[0072] The water content in the oil sample was...

Embodiment 2

[0087] This embodiment is used to illustrate the assay method of water content in the oil product of the present invention

[0088] The operation was carried out according to the method described in Example 1, except that tetrahydrofuran was used instead of dimethylformamide, and the volume ratio of methanol and tetrahydrofuran was 7:3.

[0089] The method of this embodiment can be used for multiple consecutive measurements, and the number of consecutive and accurate measurements can reach more than 8 times. The results of the calculated water content are shown in Table 2.

Embodiment 3

[0091] This embodiment is used to illustrate the assay method of water content in the oil product of the present invention

[0092] Operate according to the method described in Example 1, except that chlorobenzene is used instead of dimethylformamide, and the volume ratio of methanol and chlorobenzene is 7:3.

[0093] After 2-3 consecutive measurements using the method of this embodiment, the electrode sticking will occur. The results of the calculated water content are shown in Table 2.

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Abstract

The invention relates to the field of analysis and detection, and discloses a method for determining the water content in an oil product, which comprises the following steps: in the presence of methanol and an aprotic polar solvent, reacting water in an oil product sample with a Karl Fischer reagent, and determining the water content in the oil product sample. According to the method, the content of water in the oil product sample containing the heavy oil can be rapidly and accurately determined, and the detection range of the Karl Fischer method is expanded.

Description

technical field [0001] The invention relates to the field of analysis and detection, in particular to a method for measuring the water content in oil products. Background technique [0002] At present, the national standard methods for the determination of moisture in petroleum products and coking products include GB / T2288-2008 Determination of Moisture in Coking Products, GB / T260-2016 Determination of Moisture in Petroleum Products, and GB / T6283-2008 Determination of Moisture Content in Chemical Products-Carl · Fischer method (general method) and GB / T6284-2006 General method for the determination of moisture in chemical products - drying loss method. The above methods can be summarized into three categories: one is the distillation method, the determination principle is to mix the sample with an anhydrous solvent, and carry out moisture determination through distillation; The water in the sample species is lost, and the water content is calculated according to the mass dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/168
Inventor 陈跃华蔡伟元刘新颖周旭东段晓军
Owner CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD