Method for rapidly determining moisture content in MTO-grade methanol by using refraction method

A technology of refraction and methanol, which is applied to the measurement of phase influence characteristics, etc., can solve problems such as difficulty in moisture content, and achieve the effects of reducing energy consumption, shortening analysis time, and simplifying operation steps

Pending Publication Date: 2021-01-05
SHAANXI YANCHANG CHINACOAL YULIN ENERGY CHEM
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the coal chemical industry, the water content of coal-made MTO grade methanol is 6% to 10%, the maximum not exceeding 15%, and the refractive index of methanol and water is similar (at 20°C, the refractive index of methanol: 1.3290, the refractive index of water Rate: 1.3330) under the objective conditions, it is difficult to accurately determine the moisture content in MTO grade methanol by using the standard curve of refractive index

Method used

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  • Method for rapidly determining moisture content in MTO-grade methanol by using refraction method
  • Method for rapidly determining moisture content in MTO-grade methanol by using refraction method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0060] Example 1 spike experiment

[0061] Instrument: Anton Paar Abbemat 650 refractometer;

[0062] Sample and experimental operation:

[0063] 1) Add 2g of high-purity water to the prepared MTO grade methanol (methanol-water mixed solution) with a water content of 1.5%, so that the theoretical water content is 3.43%, and the result measured with a refractometer is 1.3307, calculated according to the standard curve The moisture content is 3.40%;

[0064] 2) Add 2g of high-purity water to the prepared MTO grade methanol (methanol-water mixed solution) with a water content of 8.0%, so that the theoretical moisture content is 9.80%, and the result measured with a refractometer is 1.3335, calculated according to the standard curve The moisture content is 9.78%.

example 2

[0065] Example 2: Comparative test of MTO grade methanol and superior grade pure methanol

[0066] 1) Take the prepared MTO grade methanol solution with a theoretical moisture content of 3.43% and 9.80% as a comparison sample; take superior grade pure methanol (see Table 4), and prepare a mixed solution with a water content of 3.43% and 9.80% respectively , the data measured with a refractometer are shown in Table 3:

[0067] Table 3. Refractive Index Measured Using MTO Grade Methanol and Premium Pure Methanol

[0068] Water content 3.43% Water content 9.80% MTO grade methanol solution 1.3307 1.3335 Premium pure methanol solution 1.3307 1.3336

[0069] Table 4. Physical and chemical indicators of superior pure methanol

[0070] Chroma, (platinum-cobalt color number) Mass fraction of water, %m Carbonyl compounds, %m Acidity or Alkalinity, %m ≤5 ＜0.01 ≤0.0005 ≤0.0004

example 3

[0071] Example 3: Determination of Moisture Content in MTO Grade Methanol Using a Karl Fischer Moisture Analyzer

[0072] 1) Instruments and samples

[0073] Instrument: Mettler V20 volumetric moisture meter;

[0074] Reagent: Tianjin Siyou volumetric Karl Fischer reagent;

[0075] Sample: Take prepared MTO grade methanol with water content of 1.5% and 8.0%.

[0076] 2) Measurement steps

[0077] The above samples and reagents were added to the Karl Fischer moisture meter, and the measurement results are shown in Table 5:

[0078] Table 5. Determination results using volumetric Karl Fischer moisture meter

[0079] 1.5% water sample 8.0% water sample Measured moisture content, %m 1.508％ 8.011％

[0080] 6. Analysis of experimental results

[0081] For instance 1

[0082] The invention adds a known amount of water to the MTO grade methanol, calculates the theoretical water content, and compares the water content measured by a refractometer with the...

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Abstract

The invention discloses a method for rapidly determining the moisture content in MTO-grade methanol by using a refraction method. The method comprises the following steps: preparing a methanol solution with a certain concentration gradient from absolute methanol and high-purity water; determining the refractive index of the methanol solution with each concentration gradient by using an Abbe refractometer, and drawing a standard curve of the water content and the refractive index of the methanol solution; and calculating the water content of the sample by utilizing a standard curve according tothe detected refractive index of the MTO-grade methanol sample. The determination method provided by the invention is rapid, simple and convenient, and reduces the analysis cost.

Description

technical field [0001] The invention belongs to the field of quality control and analysis of MTO grade methanol products, in particular to a method for measuring the water content of MTO grade methanol. Background technique [0002] Methanol (CH 3 OH) is a saturated monohydric alcohol, which is miscible with water in any proportion and is an important industrial raw material. Water content is the main factor affecting the purity of MTO grade methanol, which must be effectively controlled in industrial applications. The rapid and accurate determination of the water content of MTO grade methanol is of great significance to guide the efficient operation of production equipment and determine the quality of product methanol. [0003] At present, the water content in MTO grade methanol (the water content of MTO grade methanol) is mainly determined by Karl Fischer volumetric method and chromatography. The Karl Fischer volumetric method is generally used for samples with a water ...

Claims

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Application Information

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IPC IPC(8): G01N21/41
CPCG01N21/41
Inventor 郭凡陈方园李妮秦超张辽
Owner SHAANXI YANCHANG CHINACOAL YULIN ENERGY CHEM
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