Solid catalytic production method of biodiesel

Abstract

The invention relates to the technical field of a production method of the bio-diesel, in particular to a solid catalytic production method of the bio-diesel. The method is that: lower alcohol and vegetable oil are mixed, stirred and heated with existing of solid acid or solid base catalyst to result in transesterification; after the reaction, the catalyst is separated by a centrifuge; the reacted mixture is stood and divided into an upper layer and a lower layer, the upper layer is coarse products and the lower layer is mixed liquid of glycerol and the rest methanol; at last the bio-diesel is obtained by distilling the upper coarse ester. The yield of the bio-diesel produced by the invention can be more than 99 percent and all performance indexes of the product basically meet the standard of foreign similar products and are close to the main performance indexes of Chinese 0 model diesel (GB 252-1994, superior grade product).

Description

technical field

[0001] The invention relates to the technical field of a biodiesel production method. Background technique

[0002] Biodiesel, namely fatty acid methyl ester, is currently mostly prepared by homogeneous catalyzed transesterification method, using liquid acid or liquid base catalyst, usually NaOH, KOH or concentrated sulfuric acid. If a liquid base is used as a catalyst, the raw material oil and methanol must be strictly dehydrated, otherwise it is easy to form a milky substance, and the free acid in the raw material oil will greatly damage the activity of the basic catalyst. Also someone prepares biodiesel under the condition that liquid acid catalyst exists, CN1382762A adopts sulfuric acid or benzenesulfonic acid to make catalyzer, and CN 1412278A adopts sulfuric acid to make catalyzer, although liquid acid catalyst has no special requirement to the moisture and free acid content of raw material oil, but liquid The acid is corrosive, which makes it highly d...

Examples

Embodiment 1

[0014] Put 80ml of soybean oil (with a density of 0.92g / cIIl3) and 20ml of methanol (with a density of 0.792g / cnl3) into a 250ml three-necked round-bottomed flask, stir, add 2.2 grams of 100-mesh zirconium sulfate, heat to 65°C, and react for 6 hours After that, stop stirring and heating. First move the reaction solution to the centrifuge cylinder to separate the zirconium sulfate, then pour it into the separatory funnel, let it stand still, and divide it into upper and lower layers.

[0015] After methanol was removed by distillation in the upper layer water bath, 81.05 grams of biodiesel was obtained, and the yield could reach 99%. After steaming the remaining methanol in the lower layer, 7.50 grams of glycerol was obtained, and the theoretical glycerol yield was 7.57 grams. It is 99%, consistent with the above conclusion.

[0016] The obtained biodiesel product was analyzed by high-performance liquid chromatography (chromatographic column VD-ODS (150L×4.6), 25°C, 0.8ml / min...

Embodiment 2

[0018] Put 80ml of soybean oil (with a density of 0.92g / cm3) and 20ml of methanol (with a density of 0.792g / cm3) into a 250mi three-neck round bottom flask, stir, add 2.2g of 80-100 mesh zinc oxide, heat to 65°C, and react After 6 hours, stirring and heating were stopped. First move the reaction solution to the centrifugal cylinder to separate the zinc oxide, then pour it into the separatory funnel, let it stand still, and divide it into upper and lower layers.

[0019] After the methanol was distilled off in the upper layer water bath, 80.23 grams of biodiesel was obtained, and the yield could reach 98%. After the remaining methanol was distilled off in the lower layer, 7.42 grams of glycerol was obtained, and the theoretical glycerol yield was 7.57 grams. It is 98%, consistent with the above conclusion.

[0020] The obtained biodiesel product was analyzed by high performance liquid chromatography (chromatographic column VD-ODS (150L×4.6), 25°C, 0.8ml / min, methanol was the s...

technical field

[0001] The invention relates to the technical field of a biodiesel production method. Background technique

[0002] Biodiesel, namely fatty acid methyl ester, is currently mostly prepared by homogeneous catalyzed transesterification method, using liquid acid or liquid base catalyst, usually NaOH, KOH or concentrated sulfuric acid. If a liquid base is used as a catalyst, the raw material oil and methanol must be strictly dehydrated, otherwise it is easy to form a milky substance, and the free acid in the raw material oil will greatly damage the activity of the basic catalyst. Also someone prepares biodiesel under the condition that liquid acid catalyst exists, CN1382762A adopts sulfuric acid or benzenesulfonic acid to make catalyzer, and CN 1412278A adopts sulfuric acid to make catalyzer, although liquid acid catalyst has no special requirement to the moisture and free acid content of raw material oil, but liquid The acid is corrosive, which makes it highly d...

Examples

Embodiment 1

[0014] Put 80ml of soybean oil (with a density of 0.92g / cIIl3) and 20ml of methanol (with a density of 0.792g / cnl3) into a 250ml three-necked round-bottomed flask, stir, add 2.2 grams of 100-mesh zirconium sulfate, heat to 65°C, and react for 6 hours After that, stop stirring and heating. First move the reaction solution to the centrifuge cylinder to separate the zirconium sulfate, then pour it into the separatory funnel, let it stand still, and divide it into upper and lower layers.

[0015] After methanol was removed by distillation in the upper layer water bath, 81.05 grams of biodiesel was obtained, and the yield could reach 99%. After steaming the remaining methanol in the lower layer, 7.50 grams of glycerol was obtained, and the theoretical glycerol yield was 7.57 grams. It is 99%, consistent with the above conclusion.

[0016] The obtained biodiesel product was analyzed by high-performance liquid chromatography (chromatographic column VD-ODS (150L×4.6), 25°C, 0.8ml / min...

Embodiment 2

[0018] Put 80ml of soybean oil (with a density of 0.92g / cm3) and 20ml of methanol (with a density of 0.792g / cm3) into a 250mi three-neck round bottom flask, stir, add 2.2g of 80-100 mesh zinc oxide, heat to 65°C, and react After 6 hours, stirring and heating were stopped. First move the reaction solution to the centrifugal cylinder to separate the zinc oxide, then pour it into the separatory funnel, let it stand still, and divide it into upper and lower layers.

[0019] After the methanol was distilled off in the upper layer water bath, 80.23 grams of biodiesel was obtained, and the yield could reach 98%. After the remaining methanol was distilled off in the lower layer, 7.42 grams of glycerol was obtained, and the theoretical glycerol yield was 7.57 grams. It is 98%, consistent with the above conclusion.

[0020] The obtained biodiesel product was analyzed by high performance liquid chromatography (chromatographic column VD-ODS (150L×4.6), 25°C, 0.8ml / min, methanol was the s...