PRODUCTION METHOD OF BIO-DIESEL WITH IMPROVED LOW TEMPERATURE FLUIDITY BY USING SPECIFIC ETHYLENE AND VINYL ESTER FOR REGULATING SIZE OF N-PARAFFIN CRYSTAL

摘要

A method for producing bio-diesel with improved low temperature fluidity and esterification effect of fat and alcohol is provided to promote esterification rate and increase productivity and yield of products by adding at least one copolymer of specific ethylene and vinyl ester capable of inhibiting behavior of wax dispersion and low temperature fluidity. The method comprises the steps of: recycling 10-30wt.% of ester product obtained from esterification in presence of fat and alcohol; blending the fat and alcohol together with the recycled ester product into single liquid mixture; and adding 10-1,500ppm of copolymer of 60-90wt.% of ethylene and 10-40wt.% of long branched chain type of vinyl ester relative to weight of bio-diesel oil to the mixture. The bio-diesel includes bio-diesel oil and at least one copolymer comprising: (b) ethylene monomer having bi-valent units; (c) ethylene monomer having another bi-valent units; and (d) 5-12mol.% of monomer having another bi-valent units.