Effect of poly ( ethylene-vinyl acetate ) pour point depressant on the 1 cold flow properties and crystallization behavior of soybean biodiesel 2 blends fuel

Although biodiesel-diesel blends are being widely used in diesel engine, 10 investigations on its cold flow properties and crystallization behavior are still scarce. 11 In this paper, poly(ethylene–vinyl acetate) (PEVA) pour point depressant and 12 petroleum diesel were worked together to enhancing the cold flow properties of 13 soybean biodiesel. PEVA presented better positive effect in reducing the cold filter 14 plugging point (CFPP) of biodiesel blends. B40 treated with 1% PEVA exerted the 15 best cold flow properties, and its CFPP was decreased by ‒14 ̊C. In addition, the 16 crystallization behavior was changed variously. The sizes of crystals were decreased 17 as well as the amount of crystals was increased notably. 18