Where is the density-temperature correction coefficient for dichloroethane?
Thread Content
Yesterday, I measured the density of 1,2-dichloroethane; since the temperature of the sample was 15°C, I now want to convert this value to the density at 20°C. I’m not sure where I can find the density-temperature correction factor for 1,2-dichloroethane – it’s not specified in the standards, only that this factor can be obtained by consulting tables. Thank you in advance to all those who can help.
A B n 0.46501 0.28742 0.31041 The formula for calculating density is as follows: T is temperature, k； Tc is the critical temperature, k ； d is density, g/cm3 ； A, B, n are the parameters as mentioned above: d = A * B^((1-T/Tc)^n)
Is the critical temperature referring to the boiling point of that substance?
They are different concepts. Boiling point refers to the temperature at which, under a certain pressure, the saturated vapor pressure of a substance equals that pressure. It is closely related to pressure; many substances with high boiling points have their boiling points reduced by lowering the pressure, that is, in a vacuum environment, thereby reducing the energy consumption required for distillation or separation. The critical temperature refers to a specific temperature for each substance; above this temperature, no matter how much the pressure is increased, the gaseous substance will not liquefy, and this temperature is the critical temperature. Lowering temperature and increasing pressure are the conditions for liquefying a gas. However, applying pressure alone does not necessarily liquefy the gas; it depends on whether the gas is below its critical temperature at that time. Therefore, to liquefy the substance ； First, it is necessary to manage to reach its own critical temperature. For example, the critical temperature of water is 374°C, which is much higher than its boiling point of 100°C at standard pressure. This post was last edited by woonty on 2009-4-7 21:52.]
Using the formula you provided, I calculated that the density of dichloroethane is… Yes, the critical temperature of dichloroethane is 563.15 K