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CN-224220762-U - Crude ethanol purification recovery system

CN224220762UCN 224220762 UCN224220762 UCN 224220762UCN-224220762-U

Abstract

The utility model belongs to the technical field of purification, and relates to a crude ethanol purification and recovery system which comprises a crude ethanol raw material tank, a dehydration unit, an ethanol rectifying tower, an ethanol product tank, a methanol buffer tank and a weight-removing buffer tank, wherein the crude ethanol raw material tank, the dehydration unit, the ethanol rectifying tower and the ethanol product tank are sequentially communicated along the flow direction of materials, and the methanol buffer tank and the weight-removing buffer tank are also respectively communicated with the ethanol rectifying tower. According to the utility model, through the dehydration unit and the ethanol rectifying tower which are sequentially arranged, crude ethanol firstly enters the dehydration unit for dehydration, and then passes through the ethanol rectifying tower to obtain methanol and ethanol, so that azeotropy of ethanol and water in rectification can be effectively avoided, and the recovery rate of ethanol is improved.

Inventors

  • MENG FANHUA
  • HAN QIANG
  • WAN LI

Assignees

  • 内蒙古荣信化工有限公司

Dates

Publication Date
20260512
Application Date
20250325

Claims (9)

  1. 1. The crude ethanol purifying and recycling system is characterized by comprising a crude ethanol raw material tank (10), a dehydration unit (20), an ethanol rectifying tower (30), an ethanol product tank (40), a methanol buffer tank (50) and a de-weight buffer tank (60); The crude ethanol raw material tank (10), the dehydration unit (20), the ethanol rectifying tower (30) and the ethanol product tank (40) are sequentially communicated along the flow direction of materials, the methanol buffer tank (50) and the de-weight buffer tank (60) are also respectively communicated with the ethanol rectifying tower (30), The dehydration unit (20) comprises a dehydration device, the dehydration device comprises a shell and a dehydration membrane, the dehydration membrane is positioned on the inner section of the shell and divides the shell into an upper cavity and a lower cavity, the lower cavity is communicated with the crude ethanol raw material tank (10), and the upper cavity is communicated with the ethanol rectifying tower (30).
  2. 2. The crude ethanol purification and recovery system according to claim 1, wherein the dehydration membrane is an inorganic pervaporation membrane or a reverse osmosis membrane, and the pressure difference between two sides of the dehydration membrane is 0.32Mpa to 0.40Mpa.
  3. 3. The crude ethanol purifying and recycling system according to claim 2, wherein one or more dehydration devices are provided, when the plurality of dehydration devices are provided, the plurality of dehydration devices are sequentially connected in series along the material flow direction, the lower cavity of the head dehydration device is communicated with the crude ethanol raw material tank (10), and the upper cavity of the tail dehydration device is communicated with the ethanol rectifying tower (30).
  4. 4. The crude ethanol purification and recovery system according to claim 2, wherein an ethanol discharge control valve (103) and a dehydration feed control valve (203) are sequentially arranged between the crude ethanol raw material tank (10) and the lower cavity along the flow direction of the material.
  5. 5. The crude ethanol purification and recovery system according to claim 4, wherein a dehydration discharge control valve (204) is provided between the dehydration device and the ethanol rectifying tower (30).
  6. 6. The crude ethanol purification recovery system as claimed in claim 5, wherein a rectifying column discharge control valve (305) is provided between the ethanol rectifying column (30) and the ethanol product tank (40).
  7. 7. The crude ethanol purification and recovery system according to claim 6, wherein the ethanol rectifying tower (30) is externally connected with a rectifying tower feeding pipeline (301), a rectifying tower discharging pipeline (302), a rectifying light component pipeline (303) and a rectifying heavy component pipeline (304), the rectifying tower feeding pipeline (301) is communicated with the upper cavity, the rectifying tower discharging pipeline (302) is communicated with the ethanol product tank (40), the rectifying tower discharging control valve (305) is positioned on the rectifying tower discharging pipeline (302), the rectifying light component pipeline (303) is communicated with the methanol buffer tank (50), and the rectifying heavy component pipeline (304) is communicated with the de-heavy buffer tank (60).
  8. 8. The crude ethanol purification and recovery system as claimed in claim 7, further comprising a rectifying tower discharging circulation pipeline (306), wherein one end of the rectifying tower discharging circulation pipeline (306) is communicated with the rectifying tower discharging pipeline (302), and the other end of the rectifying tower discharging circulation pipeline (306) is communicated with a lower cavity of the dehydration device through a dehydration feeding control valve (203).
  9. 9. The crude ethanol purification and recovery system according to claim 8, wherein a rectifying tower discharging circulation control valve (307) is arranged on the rectifying tower discharging circulation pipeline (306), and the rectifying tower discharging circulation control valve (307) and the dehydration feeding control valve (203) are sequentially arranged along the material flow direction.

Description

Crude ethanol purification recovery system Technical Field The utility model belongs to the technical field of purification, and relates to a crude ethanol purification and recovery system. Background In the glycol production process, a byproduct of crude ethanol is often produced, and the crude ethanol can be purified to obtain an absolute ethanol product (ethanol for short). However, because the crude ethanol contains methanol, water and other impurity components, the content of the purified ethanol is low due to direct purification, and the ethanol does not meet the standard of absolute ethanol and cannot be directly sold as a product. Therefore, in actual production, the crude ethanol needs to be separated and purified to obtain the absolute ethanol which meets the first grade of the standard of GB/T6820-2016 industrial ethanol. At present, crude ethanol is separated and purified by a rectifying tower, methanol and water in the crude ethanol are separated and removed, and meanwhile, an absolute ethanol product meeting the requirements is obtained by purification, but the problem is that in the process of rectifying the crude ethanol, the ethanol and the water in the crude ethanol are azeotroped, so that part of the ethanol and the water are separated from the rectifying tower along with the methanol, the recovery amount of the ethanol is influenced, and the recovery rate of the ethanol is low. Disclosure of utility model Aiming at the technical problems that in the existing crude ethanol separation and purification, the ethanol and water are azeotroped during the crude ethanol rectification, so that part of the ethanol and water can be separated out from a rectifying tower along with the methanol, the recovery amount of the ethanol is influenced, and the recovery rate of the ethanol is low, the utility model provides a crude ethanol purification and recovery system. According to the utility model, through the dehydration unit and the ethanol rectifying tower which are sequentially arranged, crude ethanol firstly enters the dehydration unit for dehydration, and then passes through the ethanol rectifying tower to obtain methanol and ethanol, so that azeotropy of ethanol and water in rectification can be effectively avoided, and the recovery rate of ethanol is improved. In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: A crude ethanol purification and recovery system comprises a crude ethanol raw material tank, a dehydration unit, an ethanol rectifying tower, an ethanol product tank, a methanol buffer tank and a weight-removing buffer tank; The crude ethanol raw material tank, the dehydration unit, the ethanol rectifying tower and the ethanol product tank are sequentially communicated along the flow direction of the materials, and the methanol buffer tank and the weightlessness buffer tank are also respectively communicated with the ethanol rectifying tower. Further defined, the dehydration unit comprises a dehydration device, the dehydration device comprises a shell and a dehydration membrane, the dehydration membrane is positioned on the inner section of the shell to divide the shell into an upper cavity and a lower cavity, the lower cavity is communicated with the crude ethanol raw material tank, and the upper cavity is communicated with the ethanol rectifying tower. Further limited, the dehydration film is an inorganic pervaporation film or a reverse osmosis film, and the pressure difference of two sides of the dehydration film is 0.32Mpa-0.40Mpa. Further limited, when the number of the dehydration devices is one or more, the dehydration devices are connected in series in sequence along the material flow direction, the lower cavity of the head end dehydration device is communicated with the crude ethanol raw material tank, and the upper cavity of the tail end dehydration device is communicated with the ethanol rectifying tower. Further limited, an ethanol discharging control valve and a dehydration feeding control valve are sequentially arranged between the crude ethanol raw material tank and the lower cavity along the flow direction of the materials. Further defined, a dehydration discharging control valve is arranged between the dehydration device and the ethanol rectifying tower. Further defined, a rectifying tower discharge control valve is arranged between the ethanol rectifying tower and the ethanol product tank. The ethanol rectifying tower is further limited, a rectifying tower feeding pipeline, a rectifying tower discharging pipeline, a rectifying light component pipeline and a rectifying heavy component pipeline are respectively connected to the ethanol rectifying tower in an external mode, the rectifying tower feeding pipeline is communicated with the upper cavity, the rectifying tower discharging pipeline is communicated with the ethanol product tank, a rectifying tower discharging control valve is arranged on the rectifying tower discha