JPS6035024B2 - How to measure aniline point - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring an aniline point, and more particularly to a method for measuring an aniline point with high accuracy by using a temperature control circuit, a differentiation circuit, an arithmetic circuit, etc. in combination.

The aniline point is generally measured to determine the composition of petroleum products, and the aniline point test method is J.
ISK2256 is established.

Various aniline point testers and methods have been developed based on this JIS method. However, depending on the test device or method, the error in the measurement value (for example, 66.
In the case of 900, the measured value was large (66.5 to 67.5 oo), and there were drawbacks such as inability to apply to sample oils such as fair-colored oil.

The present inventor has conducted extensive research to overcome the drawbacks of the conventional techniques described above and develop a method that has high measurement accuracy and can be applied to a wide range of petroleum products.

As a result, it was discovered that when measuring the aniline point by detecting the white turbidity of a mixed solution of sample oil and aniline by the amount of transmitted light, the purpose could be achieved by using a temperature control circuit, a differentiation circuit, an arithmetic circuit, etc. , we have completed the present invention. That is, the present invention provides a method for measuring the aniline point by detecting a temperature change in the white turbidity of a mixed liquid of a sample oil and aniline by a change in the amount of transmitted light. When the heating rate of the mixed liquid reaches a certain range, the differential circuit is activated to calculate dl/dT (where 1 indicates the output corresponding to the amount of transmitted light, and T is Indicates the temperature or time output of the mixed liquid.

), and when the value of dl/dT becomes zero, stop or reduce the heating of the mixed liquid by the overflow temperature control circuit, stop the differential circuit, and set 1 at that time to ls. Then, the mixed liquid is cooled through the temperature control circuit for heating up, and the arithmetic circuit is operated to calculate Δ1=ls-1, and
The present invention provides a method for measuring an aniline point, which is characterized by recording the temperature of a liquid mixture when Δ1 reaches a predetermined value.

The method of the present invention will be explained in more detail based on the drawings as follows.

In FIG. 1, a sample cell 2 is placed in a tank 1, and a light source 3 and a light receiver 4 are provided on both sides of the cell 2.

Equal amounts of the sample oil and aniline to be measured (
Usually, 10 [at a time] is poured into the heater 7 through the temperature control circuit 6 for heating while thoroughly mixing with a hawk rod 5.
The mixture of sample oil and aniline is heated to raise its temperature by heating the cassette 1. When the temperature increase rate reaches a certain range, usually 1 to 200, the differential circuit 9 connected to the mixed liquid thermometer 8 and the light receiver 4 is activated.
In this differentiating circuit 9, dl/dT is measured according to the information from the thermometer 8 and the light receiver 4, and when the value of this dl/dT becomes zero, that is, when the clear point is reached, the differentiating circuit 9 is Stop. At the same time, the heating of the sample mixture by the heating temperature control circuit 6 is stopped or weakened to stop the heating. Furthermore, the output 1 corresponding to the amount of transmitted light at this transparent point is stored as ls in one calculation circuit. This arithmetic circuit 10 is connected to the light receiver 4 and starts operating at the same time as the differentiation circuit 9 stops △1
=ls-1 (or Δ1=logls-logl). On the other hand, the sample mixture liquid is
1. There is no particular limit to the cooling rate, but
Normally, the temperature should be controlled to be about 0.5 to 1°C per minute. Cooling can generally be achieved by turning off the heater 7 or weakening its strength, but if a predetermined temperature reduction rate cannot be obtained, the tank 1 can be cooled down through the solenoid valve 12 or the like.
Just blow cooling air inside. The arithmetic circuit 10 continues to calculate △1=ls-1 while cooling the sample liquid mixture, and when the value of △1 reaches a preset value, the temperature of the liquid mixture at that time is set as the aniline point and is printed on the printer. Alternatively, it is recorded on the digital display 13. It should be noted that all the differentiating circuits, arithmetic circuits, temperature control circuits, etc. used in the method of the present invention should be totally controlled by the general control circuit 14.

Furthermore, in the method of the present invention, the aniline point is measured using the operating procedure as described above, but if you want to further improve the accuracy, repeat the steps from step to step until the recorded aniline points match within a predetermined error range. Just repeat the operation up to the tree. In this case, generally the recorded aniline point is 0.3 times in a row. ro
Or 0. When they agree within a range of 0°C, it is recorded as a true aniline point. As described above, according to the method of the present invention, it is possible to measure the aniline point with extremely high accuracy, and it is also possible to measure the aniline point with extremely high accuracy, and it is also possible to measure the aniline point with extremely high accuracy, and it is also possible to measure the aniline point with extremely high accuracy. It is possible to measure the aniline point of a wide range of petroleum products, such as:

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a control mechanism used in the method of the present invention. In the figure, 1 is a cell, 2 is a sample cell, 3 is a light source, 4 is a light receiver, and 5
6 is a temperature control circuit for increasing temperature, 7 is a heater, 8 is a thermometer, 9 is a differential circuit, 1 is a calculation circuit, 11 is a temperature control circuit for decreasing temperature, 12 is a solenoid valve, 13 is a A printer or digital display, 14 indicates a general control circuit. Figure 1

Claims (1)

[Scope of Claims] 1. A method for measuring the aniline point by detecting a temperature change in the white turbidity of a mixed liquid of a sample oil and aniline by a change in the amount of transmitted light, comprising: (a) temperature control for heating the mixed liquid; (b) When the temperature increase rate of the mixed liquid reaches a certain range, a differential circuit is activated to calculate dI/dT.
(Here, I indicates the output corresponding to the amount of transmitted light, and T indicates the temperature or time output of the mixed liquid.), and (c) the temperature is increased when the value of dI/dT becomes zero. At the same time as stopping or reducing the heating of the mixed liquid by the temperature control circuit for heating, the differential circuit is stopped and the I at that time is stored as I_s in the arithmetic circuit, and (d) the mixed liquid is then heated by the temperature control circuit for heating. and (e) when ΔI reaches a predetermined value, the temperature of the mixed liquid at that time is recorded. A method for measuring aniline points characterized by the following. 2. The method according to claim 1, characterized in that operations (a) to (e) are repeated until the measured aniline points match within a predetermined error range. 3. The method according to claim 1, wherein the rate of temperature increase of the liquid mixture is adjusted to 1 to 2°C per minute.