Synthesis of a new water reducing agent

Department of Chemical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, P. R. China E-mail : liuzuyu2005@sina.com Manuscript received 4 April 2006, revised 7 December 2006, accepted 8 December 2006 The preparation of water reducing agents from phenanthrene waste has been studied by sulfonation, condensation, neutralization and recondensation. Reaction conditions were investigated by orthogonal test, and main technical parameters optimized. The optimum conditions were as follows : molar ratio of phenanthrene to sulfuric acid (1 : 2), sulfonation temperature (160 oC), sulfonation time (3 h), molar ratio of phenanthrene to formaldehyde (1 : 1), condensation temperature (80 oC), condensation time (3 h), molar ratio of phenanthrene to carbamide (1 : 0.005), recondensation temperature (80 oC). The study showed that the water reducing agent synthesized in the work was high effective.