Method for on-line detection of concentration of produced isopropanol

Abstract

The invention provides a method for on-line detection of the concentration of produced isopropanol, and relates to the technical field of concentration detection.A temperature sensor and a density sensor are used for on-line detection of the temperature value and the corresponding density value of a produced isopropanol aqueous solution, and the density of the isopropanol aqueous solution is calculated according to the corresponding relation between the density and the temperature of the isopropanol aqueous solution. Converting the density value corresponding to the isopropanol water solution at the temperature value into the density value corresponding to the standard temperature; the density value corresponding to the standard temperature is converted into the isopropyl alcohol concentration according to the corresponding relation between the density and the concentration of the propyl alcohol aqueous solution at the standard temperature, the isopropyl alcohol concentration corresponding to the standard temperature is obtained, the problem that in existing isopropyl alcohol production, the concentration detection time is long is solved, and the method is suitable for online detection of the produced isopropyl alcohol concentration.

Description

Technical Field

[0001] The invention relates to the technical field of concentration detection, and in particular to a method for online detection of the concentration of produced isopropanol. Background Art

[0002] Isopropyl alcohol (IPA), also known as 2-propanol, is an organic compound with the chemical formula C3H8O. It is an isomer of n-propanol and a colorless, transparent liquid with an odor similar to a mixture of ethanol and acetone. It is soluble in water and most organic solvents such as alcohol, ether, benzene, and chloroform. Isopropyl alcohol is an important chemical product and raw material, mainly used in pharmaceuticals, cosmetics, plastics, fragrances, coatings, etc. On October 27, 2017, the World Health Organization's International Agency for Research on Cancer published a preliminary list of carcinogens for reference, and isopropyl alcohol is on the list of Class 3 carcinogens.

[0003] During the production process, it is necessary to detect the concentration of isopropanol. The existing technology usually uses chemical analysis (GBT 7814-2017 "Industrial Isopropanol") to obtain the concentration of isopropanol, which requires manual sampling and offline chemical analysis to obtain the concentration of isopropanol at 20 degrees Celsius, which takes a long time. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a method for online detection of the concentration of produced isopropanol, thereby solving the problem that the concentration detection in the existing isopropanol production takes a long time.

[0005] The technical solution adopted by the present invention to solve the above technical problem is: a method for online detection of isopropanol concentration, comprising the following steps:

[0006] S1, online detection of the temperature value of the isopropanol aqueous solution by a temperature sensor, and online detection of the density value corresponding to the isopropanol aqueous solution at the temperature value by a density meter;

[0007] S2. According to the correlation between the density and temperature of the isopropanol aqueous solution, the density value corresponding to the isopropanol aqueous solution at the temperature value is converted into the density value corresponding to the standard temperature;

[0008] S3. According to the corresponding relationship between the density and concentration of the propanol aqueous solution at the standard temperature, the density value corresponding to the standard temperature is converted into the isopropanol concentration to obtain the isopropanol concentration corresponding to the standard temperature.

[0009] Furthermore, the densitometer is a U-tube densitometer.

[0010] Furthermore, the standard temperature is 20 degrees Celsius.

[0011] The invention has the beneficial effects as follows: the invention provides a method for online detection of the concentration of isopropanol produced, wherein the temperature value and the corresponding density value of the isopropanol aqueous solution produced are online detected by a temperature sensor and a density sensor, and according to the corresponding relationship between the density and the temperature of the isopropanol aqueous solution, the density value corresponding to the isopropanol aqueous solution at the temperature value is converted into the density value corresponding to the standard temperature; according to the corresponding relationship between the density and the concentration of the isopropanol aqueous solution at the standard temperature, the density value corresponding to the standard temperature is converted into the isopropanol concentration, and the isopropanol concentration corresponding to the standard temperature is obtained, thereby solving the problem that the concentration detection in the existing isopropanol production takes a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention provides a method for online detection of the concentration of produced isopropanol. DETAILED DESCRIPTION

[0013] The present invention aims to solve the problem that it takes a long time to obtain the concentration of isopropanol by chemical analysis when producing isopropanol, and provides a method for online detection of the concentration of isopropanol produced. Figure 1 As shown, the following steps are included:

[0014] S1, online detection of the temperature value of the produced isopropanol aqueous solution by a temperature sensor, and online detection of the density value corresponding to the produced isopropanol aqueous solution at the temperature value by a density meter;

[0015] Specifically, the densitometer is a U-tube densitometer, and a temperature sensor is integrated in a sampling pipeline, so as to realize online detection of the temperature value and the corresponding density value of the produced isopropanol aqueous solution.

[0016] S2. According to the corresponding relationship between the density and temperature of the isopropanol aqueous solution, the density value corresponding to the isopropanol aqueous solution at the temperature value is converted into the density value corresponding to the standard temperature;

[0017] Specifically, the corresponding relationship between the density and temperature of the isopropanol aqueous solution can be obtained by measuring the density of the same isopropanol aqueous solution at different temperatures using a densitometer, wherein the standard temperature is 20 degrees Celsius.

[0018] S3. According to the corresponding relationship between the density and concentration of the propanol aqueous solution at the standard temperature, the density value corresponding to the standard temperature is converted into the isopropanol concentration to obtain the isopropanol concentration corresponding to the standard temperature.

[0019] Specifically, the corresponding relationship between the density and concentration of the propanol aqueous solution at standard temperature can be obtained by chemical analysis.

[0020] For example, data for seven isopropanol aqueous solutions are shown in Table 1.

[0021] Table 1 Data of seven isopropanol aqueous solutions

[0022]

[0023] Compared with the results obtained by chemical analysis, the density error at 20 degrees Celsius is within 0.005g / cm3 and the concentration error is within 0.2%.

Claims

1. A method for online detection of the isopropanol concentration produced, characterized in that: The following steps are involved: S1, online detection of the temperature value of the produced isopropanol aqueous solution by a temperature sensor, and online detection of the density value corresponding to the produced isopropanol aqueous solution at the temperature value by a density meter; S2. According to the corresponding relationship between the density and temperature of the isopropanol aqueous solution, the density value corresponding to the isopropanol aqueous solution at the temperature value is converted into the density value corresponding to the standard temperature; S3. According to the corresponding relationship between the density and concentration of the propanol aqueous solution at the standard temperature, the density value corresponding to the standard temperature is converted into the isopropanol concentration to obtain the isopropanol concentration corresponding to the standard temperature.

2. The method for online detection of isopropanol concentration according to claim 1, characterized in that: The densitometer is a U-tube densitometer.

3. The method for online detection of isopropanol concentration according to claim 1, characterized in that: The standard temperature is 20 degrees Celsius.

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