Continuous production apparatus and method for glycerol

Abstract

The invention discloses a continuous production apparatus and method for glycerol, which includes a distiller tank, a large wiped-film evaporator and a small wiped-film evaporator. A distillation three-stage condensing vacuum system is communicated with the top of the distiller tank (1). A desalting tank (3) is communicated with the bottom of the distiller tank (1). A crude glycerol head tank (4)is communicated with the top of the desalting tank (3). The bottom of the desalting tank (3) is communicated with a salt water tower (7) via a salt water tank (5) and a salt water pump (6). The largewiped-film evaporator (9) is communicated with the crude glycerol head tank (4). The top of the large wiped-film evaporator (9) is communicated with a large wiped-film four-stage condensing vacuum system. The bottom of the large wiped-film evaporator (9) is communicated with a residue tank (10). The small wiped-film evaporator (15) is communicated with the residue tank (10). The top of the small wiped-film evaporator (15) is communicated with a small wiped-film three-stage condensing vacuum system. A solid residue tank (17) is communicated with the bottom of the small wiped-film evaporator (15). The continuous production apparatus, for producing glycerol, is high in productivity and yield, is low in energy consumption and allows recycling utilization.

Description

technical field [0001] The invention relates to a glycerin production device and method, in particular to a glycerin continuous production device and method. Background technique [0002] Glycerin, this product is 1,2,3-propanetriol, containing not less than 95.0% C3H8O3. Glycerin is one of the important chemical raw materials. It has excellent solubility and wetting properties and is widely used in medicine, food, cosmetics, and chemical industries. The glycerol content in crude glycerin is generally about 70-80%. It is very difficult to remove impurities, decolorize, concentrate and purify crude glycerin, and high temperature and high pressure bring danger. [0003] The refinement of existing crude glycerol adopts distillation method, mainly there are following problems: one, distillation is single-pot batch distillation, and cycle is short, generally in 3-4 days; About 8%, with the evaporation of glycerin, the salt has been continuously accumulated in the still during t...

AI Technical Summary

Problems solved by technology

The glycerol content in crude glycerin is generally about 70-80%. It is very difficult to remove impurities, decolorize, concentrate and purify crude glycerin, and high temperature and high pressure bring danger

[0003] The refinement of existing crude glycerol adopts distillation method, mainly there are following problems: one, distillation is single-pot batch distillation, and cycle is short, generally in 3-4 days; About 8%, with the evaporation of glycerin, the salt has been continuously accumulated in the still during the distillation process, resulting in poorer heat transfer, increased energy consumption, and decreased output and yield, resulting in poor production efficiency , the operating cost is getting higher and higher, so it has to be shut down to brush the kettle and re-feed the operation; 3. There are a lot of intermittent distillation residues, and there are a large amount of about 40% salt and polyglycerin in the residues. The product yield is low, the energy consumption is high, and the pollution is heavy.

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