Method for measuring a degree of hydrogenation

1. A method for detecting a degree of hydrogenation of a liquid, which comprises one or more liquid hydrogen carriers which can be hydrogenated, having the following steps:

detecting a material property of the liquid; and

determining the degree of hydrogenation of the liquid on the basis of the detected material property of the liquid;

wherein the liquid comprises a mixture of dibenzyl toluene and at least partially hydrogenated dibenzyl toluene, or a mixture of benzyl toluene and at least partially hydrogenated benzyl toluene, or a mixture of benzyl toluene, dibenzyl toluene, at least partially hydrogenated dibenzyl toluene, and at least partially hydrogenated benzyl toluene; and

wherein the degree of hydrogenation of the liquid is determined on the basis of a linear relationship of the degree of hydrogenation and the detected material property.

2. The method as claimed in claim 1 , wherein in the step of detecting the material property, at least one of the following material properties is detected: density, optical index of refraction, relative permittivity, speed of sound, viscosity, adsorption, or absorption.

3. The method as claimed in claim 2 , wherein the density is determined by means of a hydrometer, a pycnometer, a hydrostatic weighing, or an oscillation measurement.

4. The method as claimed in claim 1 , wherein the material property is an optical index of refraction, and wherein the optical index of refraction is determined by means of a refractometer, a goniometer, or a Michelson interferometer.

5. The method as claimed in claim 1 , furthermore having the steps of detecting the density of the liquid and determining the degree of hydrogenation based on the density of the liquid.

6. A measuring device for detecting a degree of hydrogenation of a liquid, which comprises one or more liquid hydrogen carriers which can be hydrogenated, having:

a detection device for detecting a material property of the liquid; and

a determination device for determining the degree of hydrogenation on the basis of the detected material property of the liquid;

wherein the liquid comprises a mixture of dibenzyl toluene and at least partially hydrogenated dibenzyl toluene, or a mixture of benzyl toluene and at least partially hydrogenated benzyl toluene, or a mixture of benzyl toluene, dibenzyl toluene, at least partially hydrogenated dibenzyl toluene, and at least partially hydrogenated benzyl toluene; and

wherein the degree of hydrogenation of the liquid is determined on the basis of a linear relationship of the degree of hydrogenation and the detected material property.

7. The measuring device as claimed in claim 6 , wherein the detection device is configured to detect at least one of the following material properties: density, optical index of refraction, relative permittivity, speed of sound, viscosity, adsorption, or absorption.

8. The measuring device as claimed in claim 6 , wherein the material property is an optical index of refraction, and wherein the detection device comprises a refractometer, a goniometer, or a Michelson interferometer.

9. The measuring device as claimed in claim 6 , wherein the measuring device comprises a detection device for detecting weight or volume of the liquid in a tank.

10. The measuring device as claimed in claim 9 , wherein the measuring device comprises a calculation device for calculating a stored or storable quantity of energy in the tank on the basis of the degree of hydrogenation and the quantity of liquid.

11. The measuring device as claimed in claim 10 , wherein the measuring device comprises a fuel gauge for displaying the stored or storable quantity of energy in the tank.

12. The measuring device as claimed in claim 9 , wherein the detection device comprises a hydrometer, a pycnometer, a hydrostatic scale, or a device for oscillation measurement.

13. A vehicle having a tank for a liquid, which comprises one or more liquid hydrogen carriers which can be hydrogenated, having the measuring device as claimed in claim 6 .