Roots Vacuum Pump for Bio-diesel Distillation

At present, the production of bio-diesel mainly uses chemical methods, mainly using vegetable oils and animal oils and alcohols (low-carbon alcohols such as methanol or ethanol), under acidic or basic catalysts and high temperature conditions.

The trans-esterification reaction is carried out to generate fatty acid ester, and the bio-diesel is obtained after washing, distillation and drying. The distillation of bio-diesel needs to be carried out in a distillation column. In the existing distillation column, steam enters from the bottom of the column.

The evaporated gas is in counter current contact with the descending liquid. During the contact, the volatile (low boiling point) components in the descending liquid are continuously transferred to the gas, and the less volatile (high boiling point) components in the gas are continuously descending.

However, this distillation method not only requires too much steam, but also makes it difficult to accurately control the temperature of the steam due to the large flow area of the steam, and the contact area of the descending liquid is not sufficient, which will lead to uneven distillation.  

In order to meet the special process requirements of bio-diesel production, the roots vacuum pump can be combined with the water ring vacuum pump to form a vacuum system.

Compared with chemical method technology, the beneficial effect of roots vacuum pump in bio-diesel distillation: the equipment improves the structure of the existing distillation column, so that the distillation of liquid can be carried out between the steam plates at both ends, and two groups of the distillation plate temperature is different, which not only consumes low energy, but also can accurately control the temperature of the steam.

Distillation is carried out according to the boiling point of each substance to be separated, and a page turning device is installed in the distillation box, so that the liquid can fully contact the water vapor, and the distillation is more efficient and evenly.


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