1,3 butylene glycol with reduced odor
View Patent ↗A method of reducing odor of 1,3-butylene glycol includes contacting the 1,3-butylene glycol with an activated carbon selected from wood-based activated carbons and chemically activated carbons.
1. A method of reducing odor of 1,3-butylene glycol comprising contacting the 1,3-butylene glycol with an activated carbon selected from wood-based activated carbons and chemically activated carbons.
2. The method according to claim 1 , wherein the activated carbon is a wood-based activated carbon.
3. The method according to claim 2 , wherein the activated carbon is a chemically activated, wood-based activated carbon.
4. The method according to claim 3 , wherein the wood-based activated carbon is activated by treatment with phosphoric acid.
5. The method according to claim 1 , wherein the activated carbon employed is a granular activated carbon.
6. The method according to claim 5 , wherein the granular activated carbon has a nominal particle size of from 6 mesh to 25 mesh.
7. The method according to claim 1 , wherein the activated carbon has an apparent density of from 200 kg/m 3 to 350 kg/m 3 .
8. The method according to claim 1 , wherein the activated carbon has a surface area of from 1000 m 2 g to 2000 m 2 /g.
9. The method of claim 1 , wherein the activated carbon is pelletized activated carbon having a pellet diameter of from 2 mm to 6 mm.
10. The method according to claim 1 , wherein the activated carbon has an iodine number of at least 900 mg/g.
11. The method according to claim 1 , wherein the 1,3-butylene glycol treated is produced by aldol combination of acetaldehyde.
12. The method according to claim 1 , effective to reduce the level of ketone or acetal impurities in the 1,3-butylene glycol treated.
13. A method of reducing odor of 1,3-butylene glycol comprising contacting the 1,3-butylene glycol with a fixed bed of particulate activate carbon material selected from wood-based activated carbon and chemically activated carbons for a residence time of 1,3-butylene glycol in the bed of from 1 hour to 48 hours.
14. The method according to claim 13 , wherein the residence time of 1,3-butylene glycol in the bed is from 6 hours to 36 hours.
15. The method according to claim 13 , wherein the residence time of 1,3-butylene glycol in the bed is from 12 hours to 30 hours.
16. The method according to claim 13 , wherein the residence time of 1,3-butylene glycol in the bed is from 18 hours to 24 hours.
17. The method according to claim 13 , further comprising de-gassing the activated carbon prior to contacting the activated carbon with the 1,3-butylene glycol to be purified.
18. The method according to claim 17 , wherein the step of de-gassing the activated carbon comprises flushing the fixed bed of activated carbon with water.
19. The method according to claim 18 , wherein the fixed bed is left full of water for at least 12 hours to de-gas the activated carbon.
20. A method of post-treating a finished 1-3-butylene glycol to reduce odor consisting of contacting the 1,3-butylene glycol with an activated carbon material selected from wood-based activated carbon and chemically activated carbons, wherein the 1,3-butylene glycol is consumed without further purification.