Epichlorohydrin (ECH) is a key chemical for epoxy resins, synthesized via glycerol hydrochlorination using renewable feedstock (biodiesel byproduct). The process involves two steps: glycerol reacts with HCl to form dichloropropanol, followed by dehydrochlorination with caustic to yield ECH. This green route offers lower cost, less energy, and reduced waste compared to traditional propylene-based methods, making it the future trend.