The crude glycerol was obtained from the biodiesel production
which was prepared from base catalyzed trans-esterification
reaction of soya bean oil, with KOH as base catalyst (Jiangsu Kate
New Energy Co., Ltd, China). Crude glycerol was dilute with
deionized water at a ratio of 3:1 (v/v) to reduce its viscosity. The
pH was adjusted to about 4 with 85% phosphoric acid. Then the
acid-treated glycerol was centrifuged at 5000 rpm, followed by
collection of the middle layer (glycerol and water). Methanol was
removed by atmospheric distillation at 75 C. After the distillation,
a filtration was carried out to remove the crystallized phosphate
salts.
After the aforementioned pre-treatment, the compositions of
crude glycerol obtained were 80.1% (w/w) glycerol, 13.4% (w/w)
water, 3.7% (w/w) phosphate salts, 1.0% (w/w) free-fatty acids
and 1.8% (w/w) other compositions.
The crude glycerol was obtained from the biodiesel productionwhich was prepared from base catalyzed trans-esterificationreaction of soya bean oil, with KOH as base catalyst (Jiangsu KateNew Energy Co., Ltd, China). Crude glycerol was dilute withdeionized water at a ratio of 3:1 (v/v) to reduce its viscosity. ThepH was adjusted to about 4 with 85% phosphoric acid. Then theacid-treated glycerol was centrifuged at 5000 rpm, followed bycollection of the middle layer (glycerol and water). Methanol wasremoved by atmospheric distillation at 75 C. After the distillation,a filtration was carried out to remove the crystallized phosphatesalts.After the aforementioned pre-treatment, the compositions ofcrude glycerol obtained were 80.1% (w/w) glycerol, 13.4% (w/w)water, 3.7% (w/w) phosphate salts, 1.0% (w/w) free-fatty acidsand 1.8% (w/w) other compositions.
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