Levulinic Acid → Cesium levulinate

Temperature

65 °C

46.9 gr. of 99% pure levulinic acid is sluurried in 100 cc. distilled water. 97.3 g. of a 4.22 molar, pure cesium hydroxide solution is added and the temperature is raised to 65° C. to obtain complete solution. The solution is filtered through No. 40 filter paper to remove dust, etc. The solution is then evaporated on a hot plate to 200 g., which gives a 2 molar concentration, and it is then bottled. These materials are readily compounded into highly stable solutions which can be readily coated onto a variety of substrates. The preparation of a sensor solution of cesium benzoylpropionate, which triggers optically at 35% RH at 20° C. (when applied as a film); typifies the preparation of sensors useful for lower RH sensing.

1. customto obtain complete solution
2. filtrationThe solution is filtered through No
3. filtration40 filter paper
4. customto remove dust, etc. The solution
5. customis then evaporated on a hot plate to 200 g
6. custom, which gives
7. concentrationa 2 molar concentration, and it
8. customThe preparation of a sensor solution of cesium benzoylpropionate, which
9. customtriggers optically at 35% RH at 20° C.
10. customthe preparation of sensors useful for lower RH sensing

ORD record

ord-d13e1c25456248979d2c44affae8a1f5

Source dataset

uspto-grants-1995_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05443753