Short communicationThe distinct catalytic behaviours of CALCIUM SILICATE HYDRATE (cas 1344-96-3) for the high selectivity of 2,2′-isomer in reaction of phenol with formaldehyde

Add time:08/31/2019    Source:sciencedirect.com

The acidity and basicity of the catalyst have an important influence on the distribution of isomers. Herein, we prepared CALCIUM SILICATE HYDRATE (cas 1344-96-3) and used it for the reaction of phenol with formaldehyde to bisphenol F. The results showed that basic calcium silicate hydrate has a very high selectivity for 2,2′-isomer, which is not obvious in the presence of acidic catalysts. The highest selectivity to 2,2′-isomer (94.67%) and yield (51.33%) for bisphenol F were achieved over calcium silicate hydrate (Si/Ca = 3) catalyst at 383 K for 120 min. A possible mechanism was proposed in accordance with our examination. Changing the acidity and basicity of catalyst provides a way to improve the purity of isomers.

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