Preparation Of Epichlorohydrin From Crude Glycerol Of Biodiesel By-product

As a promising biomass, biodiesel has attracted much attention allover the word and increased produced. Couple with the vigorous development of biodiesel industry, surplus glycerol immerges and deep exploration of this glycerol has been focused. In this paper, solid base nano-catalysts were prepared and used in the production of biodiesel, and the preparation of catalysts for conversion of glycerol into epichlorohydrin and optimizing of relative factors were investigated; SO₄^2-/ZrO₂ solid super acid were synthesized and evaluated in the production of dichlorohydrin from glycerol and HCl; solid base catalyst KF/γ-Al₂O₃ with KF loaded onγ-Al2O3 were tested in the Cyclization of dichloropropanol in order to Preparation of epichlorohydrin.1.Fe3O4 as magnetic matrix were combined with Mg-Al hydrotalcites to synthesize magnetic solid base catalyst. Effect of Mg/Al and Mg/Fe mole ratio, reaction temperature, reaction time, catalyst concentration, and alcohol/oil on the biodiesel yield was studied and the optimum reaction conditions of transesterification reaction over magnetic solid base without solvent were obtained. The catalyst could be effectively recycled in magnetic fields.2. Orthogonal experiment method was introduced to optimized the preparation condition of solid acid. Effect of reaction time, reaction temperature, lifetime of catalysts on the chlorination reaction of glycerol was investigated. The results revealed that after 4h of reaction time, a yield as high as 82.1% was achieved over the catalyst dipped by H₂SO₄ and calcined at 500℃for 4h, with 130℃of reaction temperature. The solid acid catalyst could be recycled more than 6 times, which indicated its good durability.3. Solid based catlyst KF/γ-Al₂O₃ was prepared and screened in the synthesis of dichlorohydrin. Factors including dosage of KF, calcination temperature and time were investigated. And the cyclization conditions were optimized. Obtained results showed that catalyst with a KF dosage of 20%,dipping time of 4h, and calcination of 500℃posses best activity. A yield of 81.2% was accomplished under the condition of 85℃of reaction temperature and 4h of reaction time.