Dehydration device and method for preparing fuel ethanol based on continuity

Abstract

The invention provides a dehydration device and method for preparing fuel ethanol based on continuity. The dehydration device comprises a superheater (41) communicated with ethyl alcohol vapor of a high pressure rectifying tower, a regenerative vapor condenser I (71) arranged to be communicated with a hot air source, and a filter device arranged to be used for dehydrating the ethyl alcohol vapor and provided with at least three branch circuits connected in parallel and connected to the position between the superheater (41) and the regenerative vapor condenser I (71), the ethyl alcohol vapor isinjected to the filter device through the superheater (41), the filter device is subjected to dehydration material regeneration treatment through the regenerative vapor condenser I (71), the ethyl alcohol vapor is subjected to dehydration through the filter device, the situation that a molecular sieve adsorbing device is mainly composed of two adsorbers does not exist, therefore the pressure stability of a distillation column is ensured, and the efficiency of alcohol preparation is improved.

Description

technical field [0001] The invention relates to a dehydration device and method, in particular to a dehydration device and method based on continuous production of fuel ethanol. Background technique [0002] Carry out dehydration treatment to alcohol vapor so as to obtain fuel ethanol, so the dehydration device and method for producing fuel ethanol are a kind of important process device, in the existing dehydration device and method for producing fuel ethanol, fuel ethanol production mainly includes Molecular sieve adsorption dehydration and solvent azeotropic dehydration are two process devices. Solvent azeotropic dehydration has been gradually replaced by molecular sieve adsorption devices due to high gas consumption and limited product adaptability. Molecular sieve adsorption devices mainly use two adsorbers. This process The device is widely used because of its low gas consumption and wide adaptability, but it also has certain disadvantages. The production of light wine ...

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Problems solved by technology

[0002] Carry out dehydration treatment to alcohol vapor so as to obtain fuel ethanol, so the dehydration device and method for producing fuel ethanol are a kind of important process device, in the existing dehydration device and method for producing fuel ethanol, fuel ethanol production mainly includes Molecular sieve adsorption dehydration and solvent azeotropic dehydration are two process devices. Solvent azeotropic dehydration has been gradually replaced by molecular sieve adsorption devices due to high gas consumption and limited product adaptability. Molecular sieve adsorption devices mainly use two adsorbers. This process The device is widely used because of its low gas consumption and wide adaptability, but it also has certain disadvantages. The production of light wine is relatively large, accounting for 20-25% of the product. The molecular sieve adsorption device has two feeding methods, one is 95% of the liquid alcohol enters the device, and enters the adsorber in the form of gas through vaporization into alcohol gas. The other is a process combined with the alcohol distillation device, from the alcohol gas at the top of the distillation tower of the distillation device to The gas enters the adsorber in the form of gas. The adsorption device of the two adsorbers is better used in the process of liquid state as the raw material, but when combined with the distillation device, due to the large pressure fluctuation of the adsorption device, it is easy to cause the pressure fluctuation of the distillation tower and cause distillation. Alcohol escapes at the bottom of the tower, thus reducing the efficiency of alcohol production

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