Dow Chemical announced at the end of March this year that it will use new renewable resource technology to build a 150,000-ton/year epichlorohydrin plant and a 100,000-ton/year epoxy plant in Shanghai. The world-scale device will be the first application of Dow Chemical's new technology for glycerol, which will use glycerol, a by-product of biodiesel, as a raw material.
Solvay has also developed a new process for producing epichlorohydrin by reacting glycerol with hydrogen chloride. The process uses proprietary catalysts to produce the intermediate dichloropropanol in one step without the use of chlorine gas. Solvay has built a new epichlorohydrin plant at its production site in France. It will use glycerol as a by-product from the production of biodiesel from rapeseed oil. The initial capacity of the device is 10,000 tons/year, which can be expanded later based on market demand. Solvay has signed a long-term glycerin supply contract with a French biodiesel company.
At the same time, Davy Process Technology adopted a new catalyst system and successfully developed a process for producing ethylene glycol from glycerol, a by-product of biodiesel. The catalyst is a homogeneous hydrogenolysis catalyst based on noble metal salts and organophosphine ligands. The reaction proceeds in a homogeneous liquid phase with a conversion of up to 90%.
A professor of chemical engineering at the University of Missouri and a scientist at the Renewable Alternative Resources Office collaborated to develop a process for the production of propylene glycol from the biodiesel by-product glycerol. According to reports, the propylene glycol yield of this process can be higher than 73%.
In addition, ADM, Cargill and several other companies have also developed a new process for the production of propylene glycol from bio-based glycerol. At present, global propylene glycol supply is still relatively scarce, and emerging technologies provide opportunities for propylene glycol producers.
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