Adsorption of Diols on Silica Gel Modified by Phenylboronic Acid

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Takashi Sugimoto¹  Kouji Kusumoto¹  Michiaki Matsumoto¹  Kazuo Kondo¹ 

[1] Department of Chemical Engineering and Materials Science, Faculty of Engineering, Doshisha University

关键词: Adsorption;    Diol;    Phenylboronic Acid;    Silica Gel;    Separation;   

DOI  :  10.1252/jcej.40.26

来源: Maruzen Company Ltd

【 摘 要 】

References(20)Cited-By(2)Diols are key intermediate materials for polymers. Conventional distillation techniques for the separation of diols require a substantial energy input. Alternatively, in this paper we examine an adsorption technique to recover and separate diols. Silica gels modified by boronate were used as a selective adsorbent for diols. First, using potentiometric titration, we examined the number and pKa of the active site included in the gels. The values of the pKa of the boronate were larger than that of phenylboronic acid. From the adsorption experiments on the resin, we found that main adsorption mechanism was a complex formation between neutral boronic acid and the diols. A pH value smaller than pKa (=10) of boronate is desirable for the adsorption of diols. Silica gels modified by phenylboronic acid effectively adsorbed the hydrophobic diols. The adsorption capacity of vicinal and 1,3-diols were similar.

【 授权许可】

Unknown