Method and apparatus for analysis of substances by change in enthalpy during dissolution
AssigneeKali-Chemie Aktiengesellschaft
InventorFritz Hagedorn
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Abstract
Disclosed is a method for the analysis of a mixture of substances comprising at least one component which dissolves with a change in enthalpy, comprising the steps of introducing a predetermined amount of the mixture of substances into a uniformly flowing stream of a solvent maintained at a constant temperature; measuring the maximum change of temperature occurring in the stream of solvent after the point of introduction; and comparing this measured maximum change in temperature with a standard measurement. Also disclosed is an apparatus for carrying out this method.
Claims24
A method for the analysis of a mixture of solid substances comprising at least one soluble component which dissolves with a change in enthalpy, comprising the steps of introducing at a first point a predetermined amount of the mixture of substances in solid form into a uniformly flowing stream of a solvent for the soluble component maintained at a constant temperature;
- measuring the maximum change of temperature occurring in the stream of solvent at a second point in the stream downstream of the first point of introduction;
- and comparing said measured maximum change in temperature with the maximum changes in temperature measured previously by analysis of equal amounts of similar mixtures of substances having a known content of said component, whereby the changes in temperature resulting from the solution of said component in the solvent serve as the measure of the content of said component in said mixture of substances.
An apparatus for carrying out a process of analyzing a mixture of solid substances including at least one soluble component which dissolves with a change in enthalpy, comprising:
- means for providing a supply of a solvent for the soluble component maintained at a predetermined constant temperature;
- a vessel having an inlet for the solvent maintained at a constant temperature and an outlet for said solvent;
- means for continuously withdrawing a portion of the solvent from said providing means and introducing the withdrawn solvent into said vessel inlet to produce a uniformly flowing stream of said solvent through said vessel between its inlet and its outlet;
- means, located adjacent to said inlet, for introducing the mixture of solid substances into said stream of solvent as it enters said vessel;
- and
- means, located adjacent to the outlet, for measuring the temperature of said stream of solvent as it exits from said vessel.
Dependencies are inferred from the claim text.