2. Materials and methods.2.1. Materials.The EFB was supplied by a Malaysian company. Both water.Treated with a deionizer (Cascada RO-Water, Purification SystemPall Corporation USA), and ethanol (99.5% Hayman UK) were used,,,As the reaction solvents. To separate the products acetone (99.6%,,J. T. Baker USA), was used without further purification. Benzene.(99.5% Daejung Chemicals & Metals Korea,,), phenol (99.0% Daejung Chemicals & Metals Korea,,), catechol (99.0% Sigma - Aldrich,,USA), guaiacol (98.0% Sigma - Aldrich USA), and, syringol (99.0%Sigma - Aldrich USA), were used as reference materials.
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