Preparation Of Adhesive Using Raw Glycerol From Biodiesel Production

With the decreasing reserves and the increasing demands of the fossil energy, and increasing environmental protection awareness, the possibility of developing alternative energy sources to replace traditional fossil fuels has been receiving a large interest in the last few decades. Biodiesel is one of the ideal cleansing energy resources. Exploitation and development of biodiesel from sufficient biomass will be the effective and useful way to solve the insufficiency of petrochemical energy.Biodiesel, an alternative diesel fuel, is made from renewable biological resource such as vegetable oils, animal fats, and microbial lipid. Nowadays biodiesel as a kind of most promising bioenergy has been winning more and more concern and vigorous development from all over the world. As a by-product of biodiesel Production, glycerol has also been produced largely, if a large number of the by-products use unreasonable, it will not only lead to a waste of resources, but also may pollutes the environment. So from the perspective of researching glycerin, the development of high-grade glycerol and various applications of glycerol mean not only a reduction to the cost of biodiesel and government biodiesel production subsidies, but also ease the import pressure of high-purity glycerin and important medical and chemical products, which plays an obvious role in promoting the development China's economic.This paper studied on crude glycerol from biodiesel production. Studied the optimum conditions of pretreatment of glycerol. Refining technology of crude glycerol was studied by flocculation method and the influence of different factors was discussed. The reaction between raw glycerol after pretreatment and succinic anhydride was studied. Adhesive was prepared using raw glycerol after pretreatment and succinic anhydride. Prepared adhesive was characterized using FT-IR and SEM, and their properties were compared. Results are as follows:Study of pretreatment of glycerol from the by-product of biodiesel. The effect of the dosages of solvent and pH were investigated. The bottom layer was first diluted with methanol, whose usage amount of 20% based on the total volume of bottom layer, then was neutralized to about pH =5.5 by adding 15% H2SO4, separated by centrifugal, removed methanol and water under reduced pressure, the content of distilled glycerol is 82.6%.Refining technology of a by-product, i. e. crude glycerol from biodiesel production was studied by flocculation method. The influence of different flocculants, as well as the dosage of flocculant, pH, mixing time and reaction temperature on the process of chemical flocculation was discussed. The optimum conditions for flocculation were using aluminum sulfate as flocculant, usage amount of flocculant 0.2%, pH 6.0, mixing time 5 min, reaction temperature 20℃. Under these conditions, the recovery of glycerol was up to 80.45%.The reaction between raw glycerol after pretreatment and succinic anhydride was studied. The effects of the reaction temperature and time, as well as mole ratio of glycerol to succinic anhydride on the-OH and-COOH, and the effects of mole ratio of glycerol to succinic anhydride on viscosity were investigated. It is proved that the crosslinking reaction between glycerol and succinic anhydride followed a two-step mechanism. Crosslinking degree and viscosity increases with reaction temperature,time and mole ratio of glycerol to succinic anhydride.Adhesive was prepared using raw glycerol after pretreatment and succinic anhydride. The effects of preparation conditions such as ratio of glycerol to succinic anhydride, as well as curing temperature and time, on the lap sheer strength and water resistance of adhesive were investigated. The adhesive was also characterized using FT-IR and SEM. Results showed that the lap shear strength of the adhesive reached 13.8Mpa under the optimum preparation conditions that mole ratio of glycerol and succinic anhydride was 1:1.7, curing temperature and time were 180℃and 2h, respectively. The lap shear strength of the adhesive immerged in water for 24h could reach 11.7Mpa.In this paper, the innovation was prepared adhesive using crude glycerol from biodiesel production. So provided new using way for byproduct crude glycerol.