CN110823761A - Method for measuring content of ethylene glycol in frozen water - Google Patents
Method for measuring content of ethylene glycol in frozen water Download PDFInfo
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- CN110823761A CN110823761A CN201810916575.6A CN201810916575A CN110823761A CN 110823761 A CN110823761 A CN 110823761A CN 201810916575 A CN201810916575 A CN 201810916575A CN 110823761 A CN110823761 A CN 110823761A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
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Abstract
The invention discloses a method for measuring the concentration of ethylene glycol in frozen water. The method comprises the following steps: (1) preparing glycol solutions with different concentrations; (2) measuring the density of ethylene glycol solutions with different concentrations; (3) and (3) taking the concentration of ethylene glycol in the solution as an abscissa and the density as an ordinate, and making a standard curve graph of the concentration and the density to obtain: y0.99847 +0.00129XR 0.99941Y is density; x is the concentration of ethylene glycol; (4) and measuring the density of the sample, and calculating the concentration of the ethylene glycol aqueous solution according to a standard curve. The method has the advantages of simple operation, simple instrument and equipment, shortened measurement time, and rapid and accurate determination of the content of the ethylene glycol in the frozen water.
Description
Technical Field
The invention relates to the technical field of detection methods, and further relates to a method for measuring the content of ethylene glycol in frozen water.
Background
At present, few methods are used for measuring the concentration of ethylene glycol in the frozen water, wherein the volumetric method measurement operation is complex and long in time, and a large number of reagents are used.
Carbon fiber has polymerization stoste and spinning production in the production process, has the high temperature treatment process among the polymerization spinning production technology, still will cool down the processing for the production needs, and the water that is used for cooling down on the tradition, but the freezing point of water is high, and when temperature is low, water can freeze, causes cooling system pipeline spalling easily, and the boiling point of water is low, when high temperature in summer, can cause the temperature to rise. Therefore, people always look for a novel coolant to replace water, and because glycol has good water solubility, the freezing point can reach below-60 ℃ and the boiling point is above 110 ℃ at a certain proportion, glycol is widely used as a circulating medium of a cooling system. After the glycol and the water are mixed, the freezing point can be obviously reduced due to the change of the vapor pressure of the cooling water, the reduction degree is reduced along with the increase of the glycol content within a certain range, but once the vapor pressure exceeds a certain proportion, the freezing point is increased, the concentration of the glycol is different, the freezing temperature is different, and the glycol content in the freezing water is different according to the production requirement, so that the freezing water is added into a cooling circulation system in the production process and is the glycol aqueous solution.
At present, few methods are used for measuring the content of glycol in the frozen water, wherein the range for measuring the glycol by a volumetric method is limited.
Therefore, it is an urgent technical problem to develop a method for rapidly and effectively measuring the content of ethylene glycol in the chilled water.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for measuring the content of ethylene glycol in frozen water. The method has the advantages of simple operation, simple instrument and equipment, shortened measurement time, and rapid and accurate determination of the content of ethylene glycol in the frozen water.
The invention aims to provide a method for measuring the content of ethylene glycol in frozen water.
The method comprises the following steps:
(1) preparing glycol solutions with different concentrations;
(2) measuring the density of ethylene glycol solutions with different concentrations;
(3) and (3) taking the concentration of ethylene glycol in the solution as an abscissa and the density as an ordinate, and making a standard curve graph of the concentration and the density to obtain:
Y＝0.99847+0.00129X
R＝0.99941
y is density; x is the concentration of ethylene glycol;
(4) and measuring the density of the sample, and calculating the concentration of the ethylene glycol aqueous solution according to a standard curve.
Among them, preferred are:
the concentration of the ethylene glycol solution in the step (1) is 0-80%;
more preferably, the ethylene glycol concentration is 0%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, respectively.
And (2) measuring the densities of ethylene glycol solutions with different concentrations at 20 ℃.
The density measuring device can adopt a density measuring instrument which is conventional in the field, and the density of ethylene glycol solution with different concentrations can be preferably measured by adopting a WBA505 full-automatic density refractometer in the invention.
The invention can adopt the following technical scheme:
1. reagents and instrumentation:
1.1 ethylene glycol (analytically pure), high purity water
1.2 WBS505 Density refractometer, 100ml volumetric flask (10)
2. Operation steps and result determination:
2.1 preparation of solution and determination:
preparing 0-80% glycol solutions with different concentrations, taking 10 100mL volumetric flasks, numbering in sequence, respectively weighing 0, 5, 10, 20, 30, 40, 50, 60, 70 and 80g of glycol solution, fixing the volume to 100mL by using high-purity water, weighing, and calculating the glycol concentration.
The density of each solution at 20 ℃ is measured by a density refractometer, and the measured data and results are shown in the table I:
watch 1
| Serial number | Ethylene glycol weight (g) | Total weight (g) | Ethylene glycol Conc (%) | Dens(g/cm3) |
| 1 | 0 | 99.9850 | 0 | 0.99810 |
| 2 | 4.9937 | 96.2529 | 5.1881 | 1.00467 |
| 3 | 10.0123 | 99.4764 | 10.0650 | 1.01044 |
| 4 | 19.8946 | 100.3667 | 19.8219 | 1.02414 |
| 5 | 30.0158 | 103.4324 | 29.0197 | 1.03667 |
| 6 | 39.8972 | 102.8196 | 38.8131 | 1.04992 |
| 7 | 49.8998 | 104.7272 | 47.6474 | 1.06172 |
| 8 | 60.0157 | 106.1753 | 56.5251 | 1.07258 |
| 9 | 69.7536 | 105.6855 | 66.0011 | 1.08366 |
| 10 | 80.0112 | 107.7888 | 74.2296 | 1.09224 |
Taking the concentration of ethylene glycol in the solution as an abscissa and the density as an ordinate, a standard curve graph of concentration-density is made as shown in FIG. 1, and the following results are obtained:
Y＝0.99847+0.00129X
R＝0.99941
y is density; x is the concentration of ethylene glycol;
the method can measure the result of the glycol in the frozen water within half an hour, and has simple operation and simple instrument and equipment.
Drawings
FIG. 1 is a graph of ethylene glycol concentration versus density obtained by the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
Examples
Weighing 0, 5, 10, 20, 30, 40, 50, 60, 70 and 80g of ethylene glycol solution into a 100mL volumetric flask, fixing the volume to 100mL by using high-purity water, weighing, calculating the concentration of ethylene glycol, measuring the density of each solution at 20 ℃ by using a density refractometer, wherein the measurement data and the result are shown in Table I, a concentration-density standard curve chart is shown in figure 1 by using the concentration (X) of ethylene glycol as an abscissa and the measured density (Y) as an ordinate, and a standard curve Y is obtained by taking 0.99847+0.00129X as
39.8937g, 15.9885 g and 65.0137g of glycol are weighed into a 100ml volumetric flask, high-purity water is used for fixing the volume to a scale mark, the flask is shaken up and kept stand, the mass of the flask is respectively measured to be 101.6620g, 94.8630g and 99.4470g, and the concentration (real value) of glycol aqueous solution is calculated to be 39.2415%, 16.8543% and 65.3752%. The density measured by a density refractometer is 1.05057, 1.02008 and 1.08238 respectively, and the standard curve Y is 0.99847+0.00129X
The concentrations (measured values) were calculated to be 40.3876%, 16.7519% and 65.0465%, respectively, and the deviations between the actual values and the measured values were calculated to be 2.92%, 0.61% and 0.50%, respectively. As can be seen from the results, the method has the advantages of small deviation and high accuracy in the determination of the content of the glycol in the frozen water.
Measuring samples, namely measuring the density of 1-10 groups of prepared samples with known concentration by using a density refractometer, calculating the concentration of the ethylene glycol aqueous solution reversely according to a standard curve, comparing the actual value with the measured value to obtain the relative deviation shown in the table II,
watch two
The data in the second table show that the method for measuring the concentration of the ethylene glycol is convenient and quick, the accuracy is high, and the error is in a reasonable range.
Claims (5)
1. A method for measuring the concentration of ethylene glycol in chilled water, the method comprising:
(1) preparing glycol solutions with different concentrations;
(2) measuring the density of ethylene glycol solutions with different concentrations;
(3) and (3) taking the concentration of ethylene glycol in the solution as an abscissa and the density as an ordinate, and making a standard curve graph of the concentration and the density to obtain:
Y＝0.99847+0.00129X
R＝0.99941
y is density; x is the concentration of ethylene glycol;
(4) and measuring the density of the sample, and calculating the concentration of the ethylene glycol aqueous solution according to a standard curve.
2. The method for measuring the concentration of ethylene glycol in chilled water according to claim 1, wherein:
the concentration of the glycol solution in the step (1) is 0-80%.
3. The method for measuring the concentration of ethylene glycol in chilled water according to claim 2, wherein:
the concentration of the ethylene glycol in the step (1) is respectively 0%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70% and 80%.
4. The method for measuring the concentration of ethylene glycol in chilled water according to claim 1, wherein:
and (2) measuring the densities of ethylene glycol solutions with different concentrations at 20 ℃.
5. The method for measuring the concentration of ethylene glycol in chilled water according to claim 4, wherein:
and measuring the density of the ethylene glycol solution with different concentrations by using a full-automatic density refractometer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112504916A (en) * | 2020-11-04 | 2021-03-16 | 浙江恒逸聚合物有限公司 | Physical test method for rapidly determining pentaerythritol content |
Citations (3)
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| CN106153498A (en) * | 2015-04-22 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of new method detecting solute concentration in solution and device thereof |
| DE102016109250A1 (en) * | 2016-05-19 | 2017-11-23 | Endress + Hauser Flowtec Ag | Method for determining the concentration of at least one or more components in a multicomponent mixture |
| CN107389500A (en) * | 2017-06-27 | 2017-11-24 | 兰州蓝星纤维有限公司 | A kind of method and application by specific gravity test NaSCN solution concentrations |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153498A (en) * | 2015-04-22 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of new method detecting solute concentration in solution and device thereof |
| DE102016109250A1 (en) * | 2016-05-19 | 2017-11-23 | Endress + Hauser Flowtec Ag | Method for determining the concentration of at least one or more components in a multicomponent mixture |
| CN107389500A (en) * | 2017-06-27 | 2017-11-24 | 兰州蓝星纤维有限公司 | A kind of method and application by specific gravity test NaSCN solution concentrations |
Non-Patent Citations (1)
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| 张俊雅: "水中乙二醇含量测定", 《山东化工》 * |
Cited By (1)
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|---|---|---|---|---|
| CN112504916A (en) * | 2020-11-04 | 2021-03-16 | 浙江恒逸聚合物有限公司 | Physical test method for rapidly determining pentaerythritol content |
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