Study On Upgrading Of Bio-oil And Performance Of Its By-product Calcium Magnesium Acetate

Bio-oil is a palm black liquid prepared from biomass through rapid pyrolysis liquefaction. A complex composition of oils produced by pyrolysis of biomass includes carboxylic acids, phenol, alcohol, ketone, surger and acetal substances and the acetic acid content is about7%～30%. The high contents of carboxylic acid will cause high corrosive and bad fuel oil performance of bio-oil; increase the cost of storage and transportation; limit the application of bio-oil. In addition, a series of side reaction will be occurred in bio-oil system under acid conditions. Therefore, it has practical significance that the organic acid is effectively removed in bio-oil.In order to improve the calorific value of the bio-oil and reduce its corrosive, using calcium oxide and magnesium oxide as reactants, carboxylic acid in bio-oil was transferred and separated. The influence of different molar ratio of MgO and CaO on the calorific value of bio-oil was studied. The results show that compared to pure magnesium oxide reaction with bio-oil, the addition of CaO can improve the quality of the water phase and calorific value of the bio-oil in a small range. When the molar ratio of MgO and CaO was9:1, the pH of bio-oil was increased from2.5to6.5, after phase separation them (oil phase)/m (water phase) was75:25, and heat value was increased by19.29%, from16.819MJ/kg to20.063MJ/kg a. When the mole ratio was more than9:1, with the increase of the proportion of CaO, the calorific value’s increment of bio-oil was reduced.The bottom layer separated from bio-oil is a dark brown liquid containing carboxyl ate. After the suction filter, the filtrate was decolored by adding a proportion of active. The decoloration was repeated until a light yellow or a colorless liquid was obtained. The by-product calcium magnesium acetate (CMA) was obtained through evaporation and crystallization. Calcium magnesium acetate was analyzed by IR spectrum and XRD spectrum, respectively.The application performance of the by-product calcium magnesium acetate was studied. In contrast with the traditional chlorine salts snowmelt agent, the snow melting performance and the effects of CMA on concrete, rubber, plant and water quality were researched. The results show that by-products calcium magnesium acetate can be used as CMA environment-friendly snowmelt agent on road snow removal, and comply with the national standard "the road except ice snowmelt agent"(GB/T23851-2009). The corrosion rate on the concrete and rubber, and the influence on the plants are lower than the traditional chloride salt deicers.