1 | The preparation and purification process of polypropylene glycol was studied. | |
2 | Acrolein is an important intermediate for the synthesis of methionine and 1, 3-propanediol et al. | |
3 | The smoker inhales doses of nicotine vaporized with the help of a solvent such as propylene glycol. | |
4 | The desalination of 1,3- propanediol fermentation broth pretreated with acid and filtration was studied. | |
5 | The separation of 1,3-propanediol from fermentative broth by a combination of ultrafiltration and alcohol precipitation was well investigated. |