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Illegal cooking oil moisture detection method

A detection method and technology for waste oil, which can be applied in the direction of removing certain components such as weighing, measuring devices, and analytical materials, etc., can solve problems such as promotion restrictions and expensive instruments, and achieve good repeatability, high accuracy, and detection results. precise effect

Inactive Publication Date: 2018-11-06
海南澄迈神州车用沼气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this method is more accurate than the direct drying method, but it is recommended not to use it frequently.
[0005] (3) Although Karl Fischer method and infrared drying method have high detection accuracy, the instruments are expensive, which limits the promotion of these methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for detecting moisture in waste oil, comprising the steps of: putting 2 g of waste oil samples with an acid value of ≤70 mgKOH / g into a weighing bottle with constant weight, and putting them together into a beaker containing 100 g of phosphorus pentoxide for vacuum drying In the box, the vacuum drying box is connected with a vacuum pump, pump out the air in the vacuum drying box to a pressure of 370mmHg to 400mmHg, and at the same time heat it to 65°C, close the piston on the vacuum pump, stop pumping, and dry it at a constant temperature for 4 hours. Introduce dry air to restore the pressure in the vacuum drying oven to normal pressure, take out the weighing bottle, place it in the desiccator for 0.5h, cool to room temperature, weigh, and repeat the operation until the gutter oil sample has constant weight.

Embodiment 2

[0022] A method for detecting moisture in waste oil, comprising the following steps: putting 3 g of waste oil samples with an acid value of ≤70 mgKOH / g into a weighing bottle of constant weight, and putting them together into a beaker containing 120 g of phosphorus pentoxide for vacuum drying In the box, the vacuum drying box is connected with a vacuum pump, pump out the air in the vacuum drying box to a pressure of 350mmHg to 370mmHg, and at the same time heat it to 60°C, close the piston on the vacuum pump, stop pumping, and dry it at a constant temperature for 4 hours. Introduce dry air to restore the pressure in the vacuum drying oven to normal pressure, take out the weighing bottle, place it in the desiccator for 0.5h, cool to room temperature, weigh, and repeat the operation until the gutter oil sample has constant weight.

Embodiment 3

[0024] A method for detecting moisture in waste oil, comprising the steps of: putting 4 g of waste oil samples with an acid value of ≤70 mgKOH / g into a constant-weight weighing bottle, and putting them together in a vacuum-dried beaker containing 130 g of phosphorus pentoxide In the box, the vacuum drying box is connected with a vacuum pump, pump out the air in the vacuum drying box to a pressure of 330mmHg to 350mmHg, and at the same time heat it to 60°C, close the piston on the vacuum pump, stop pumping, and dry it at a constant temperature for 4 hours. Introduce dry air to restore the pressure in the vacuum drying oven to normal pressure, take out the weighing bottle, place it in the desiccator for 0.5h, cool to room temperature, weigh, and repeat the operation until the gutter oil sample has constant weight.

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Abstract

The invention provides an illegal cooking oil moisture detection method which comprises the following steps: putting an illegal cooking oil sample into a constant-weight weighing bottle, together witha flask filled with phosphorus pentoxide, putting into a vacuum drying tank, exhausting the air by controlling pressure to 300-400mmHg, heating to 60-65 DEG C, carrying out constant-temperature drying, introducing dry air after completing drying, taking out the weighing bottle after recovering the pressure in the vacuum drying tank to normal pressure, putting into a dryer, cooling to the room temperature, weighing, and repeating operation till the illegal cooking oil sample is constant in weight. By adopting the method, oxidation weight increase or thermal decomposition phenomenon of grease in the illegal cooking oil can be effectively avoided, deviation can be reduced, the accuracy of illegal cooking oil moisture content detection is high, the stability of the detection method can be achieved, the quality of the illegal cooking oil can be controlled or evaluated, and good application of the illegal cooking oil can be promoted.

Description

technical field [0001] The invention relates to the technical field of waste oil, in particular to a method for detecting water in waste oil. Background technique [0002] Waste oil is used as the raw material for refining biodiesel, and its quality is very important. Moisture is one of the key factors affecting the quality, because moisture is one of the conditions required for the growth and reproduction of microorganisms. Excessive water will accelerate the growth and reproduction of microorganisms, which will make the oil rancid and oxidized more seriously, so there is The moisture content in the grease must not exceed 0.2% according to the national regulations, so the moisture content is one of the important detection indicators. At present, there is no general detection standard for waste oil. At present, the commonly used detection methods include direct drying method, distillation method, Karl Fischer method and infrared drying method. [0003] (1) The direct dryi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
CPCG01N5/045
Inventor 王永兴
Owner 海南澄迈神州车用沼气有限公司
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