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| Separation of isostearic acid by tartaric acid-assisted urea adduction fractionation |
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| KeyWord:isostearic acid tartaric acid urea adduction fractionation |
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| Abstract: |
| Isostearic acid was separated by tartaric acid-assisted urea adduction fractionation. The purification conditions were optimized by single factor experiment, and the inclusion complex was analyzed by microscope and X-ray diffractometer. The results showed that the optimal conditions were obtained as follows: molar ratio of tartaric acid to urea 1∶?6, mass ratio of urea to mixed fatty acid 2∶?1, mass ratio of methanol to mixed fatty acid 11.9∶?1, adduction fractionation time 12 h and adduction fractionation temperature 10?℃. Under these conditions, the purity of isostearic acid was 72.1%, and the yield was 874%. When the molar ratio of tartaric acid to urea was 1∶?6, the external morphology of solid was complete, the characteristic peak intensity of the stearic acid molecule was the highest, the unit cell volume was 1 849.9 3, the bond length was a=399 , b=4.9 , c=9.4 , and the lattice parameter corresponded to the stearic acid standard card. By controlling the dosage of tartaric acid, the external morphology and crystal structure of the inclusion complex could be regulated to change the purity and yield of the isostearic acid. |
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