Method and device for producing biomass absolute ethyl alcohol

An anhydrous ethanol, production method technology, applied in the fields of biofuels, chemical instruments and methods, preparation of organic compounds, etc. high rate effect

Active Publication Date: 2015-01-07
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is: the energy consumption of products in the process of bioma

Method used

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  • Method and device for producing biomass absolute ethyl alcohol
  • Method and device for producing biomass absolute ethyl alcohol
  • Method and device for producing biomass absolute ethyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] like figure 1 , The equipment used in the separation technology in the absolute ethanol production process described in the embodiment of the present invention includes: a pressurized rectification tower 1, an atmospheric rectification tower 2, a vacuum rectification tower 3, a pervaporation membrane 4, a vacuum pump 5 , reboiler; heat exchanger; permeate condenser 18; heater 19; tower top condenser 20, all equipments are connected by pipelines and valves.

[0069] 10900kg / h 40°C raw material solution containing 11.4wt% ethanol from the fermentation section is input into the rectification-pervaporation system through the pipeline. The absolute pressure at the top of the pressurized distillation column 1 is 0.42MPa, the temperature at the top of the column is 119°C, and the temperature at the bottom of the column is 146°C. The heat of the reboiler at the bottom of the column is provided by primary steam, and the reflux ratio is 0.58; The absolute pressure at the top of...

Embodiment 2

[0075] devices such as figure 2 As shown, the difference from Example 1 is that the heat exchange sequence of the dehydrated ethanol of the pervaporation membrane 4 has changed, and it first carries out the first-stage heat exchange with the total feed liquid of the fermentation broth raw material, and then, the feed liquid and The mixed liquid in the bottom of the rectification tower is subjected to second-stage heat exchange, and then the dehydrated ethanol is sequentially exchanged with the materials that enter the vacuum, normal pressure, and pressurized rectification towers separately to obtain 99.7% ethanol per ton. The amount of steam is 1.40-1.45 tons.

[0076]

Embodiment 3

[0078] like image 3 As shown, the difference from Example 1 is that the heat exchange mode of the dehydrated ethanol of the pervaporation membrane 4 has changed, and it first carries out three-stage heat exchange with the fermented liquid that has undergone the two-stage heat exchange. It is not as in Example 1 that the raw material liquids entering the three rectification towers are sequentially heat-exchanged, but the total fermented liquid from the heat exchanger is directly heat-exchanged, and then split to the three distillation towers. A rectification tower, and the feed liquid after the split is then subjected to four-stage heat exchange with the bottom liquid of the rectification tower, and the amount of steam required per ton to obtain 99.7% ethanol is 1.4 to 1.5 tons.

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Abstract

The invention relates to a method and a device for producing biomass absolute ethyl alcohol, and belongs to the technical field of organic solvent dehydration. The equipment used by the production method comprises a pressurized rectifying tower, an atmospheric rectifying tower, a vacuum distillation tower and a pervaporation membrane dehydration device, wherein the equipment is connected through a pipeline and a valve; reboiling heat at the bottom of the pressurized rectifying tower is provided by primary steam; the reboiling heat at the bottom of the atmospheric rectifying tower is provided by an overhead product of a high-pressure tower; and the reboiling heat at the bottom of the vacuum distillation tower is provided by the overhead product of an atmospheric tower. A feed solution enters the rectifying tower after being preheated by an absolute ethyl alcohol product and kettle raffinate; and the overhead product of the rectifying tower is further evaporated after being mixed, and then enters the pervaporation membrane dehydration device to dehydrate. According to the production method, optimal configuration of all levels of energy in the system is considered, thus the target of the system for saving energy is achieved, and the steam consumption of the overall system can be saved by over 30%-50% in comparison with a traditional technology.

Description

[0001] technical field [0002] The invention relates to a production method and device of biomass anhydrous ethanol, belonging to the technical field of organic solvent dehydration. [0003] Background technique [0004] Absolute ethanol is widely used in food, chemical industry, fuel, military industry, medicine and other fields. The concentration of ethanol produced by biomass fermentation is generally 3-20wt%. After removing most of the impurities such as water, aldehydes and fusel oil in the ordinary distillation section, the ethanol with the highest concentration of 95% forms an azeotrope with water, which is difficult to use The method of ordinary distillation is separated. In order to obtain absolute ethanol, the ethanol must be further dehydrated. [0005] The existing dehydration methods mainly include adsorption dehydration, azeotropic distillation, salt extraction and rectification, pervaporation membrane dehydration and so on. Add benzene to azeotropic dist...

Claims

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Application Information

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IPC IPC(8): C07C29/76C07C29/80C07C31/08
CPCC07C29/76C07C29/80Y02E50/10C07C31/08
Inventor 顾学红相里粉娟余从立庆祖森
Owner JIANGSU NINE HEAVEN HIGH TECH
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