Device for preparing high-grade alcohol by double-coarse double-fine double-methanol nine-tower differential pressure distillation

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Through the double-coarse double-sum dim-methanol nine-tower differential pressure distillation device, the problem of insufficient separation efficiency of monomethanol tower is solved, and heat recovery and efficient separation is achieved, energy consumption is reduced and product stability is improved.

CN223184096UActive Publication Date: 2025-08-05FEICHENG JINTA ALCOHOL CHEM EQUIP CO LTD

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Patent Information

Application Number: CN202422243201.6
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-09-13
Publication Date: 2025-08-05
Estimated Expiration: 2034-09-13

AI Technical Summary

Technical Problem

In the existing alcohol production, the separation efficiency of the monomethanol column is limited, and it is difficult to quickly adapt to fluctuations in raw material components and changes in production demand, resulting in a decrease in product stability and high energy consumption.

Method used

The double-coarse double-finish double-cine double-methanol nine-tower differential pressure distillation device is adopted. By setting up two methanol towers and recovery towers, heat recovery and efficient separation are achieved, including the combination of normal pressure and negative pressure rough towers, water washing towers, multiple refined towers and recovery towers, and the heat utilization and separation process is optimized.

Benefits of technology

It reduces energy consumption, improves product stability, reduces methanol content by 88%, and its energy consumption is comparable to that of a single tower system.

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Abstract

The utility model relates to a device for preparing high-quality alcohol through double-coarse double-fine double-methanol nine-tower differential pressure distillation, and belongs to the technical field of alcohol preparation, the device comprises a coarse tower, an aldehyde discharge tower, a water washing tower, a fine tower, a first methanol tower and a second methanol tower which are sequentially connected through pipelines, a gas outlet in the top of the first methanol tower is connected with a gas inlet of a reboiler of the second methanol tower, and a gas outlet in the top of the second methanol tower is connected with a gas outlet of a reboiler of the second methanol tower; a gas outlet of the second methanol tower reboiler is connected with a gas inlet of the second methanol tower; a gas outlet in the top of the second methanol tower is connected with a gas inlet of the aldehyde removal tower reboiler; a gas outlet of the aldehyde removal tower reboiler is connected with a gas inlet in the top of the aldehyde removal tower. According to the scheme, on the premise that one methanol tower is additionally arranged, heat recycling is achieved, energy consumption is reduced, steam of the negative-pressure coarse tower and steam of the first methanol tower are arranged to supply heat to the second methanol tower at the same time, and the heat requirement of the additionally arranged methanol tower is met as much as possible.

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Description

Technical Field

[0001] The present application relates to the technical field of alcohol production, and in particular to a device for producing high-grade alcohol by double-crude, double-fine, double-methanol nine-tower differential pressure distillation. Background Art

[0002] In the alcohol industry, alcohol production is a critical and energy-intensive process. Distillation, as the core link, is not only the most important production step but also the most energy-intensive component of the entire production chain. Energy consumption in the distillation system and cooling water accounts for 60% to 70% of total production energy consumption. Therefore, improving distillation efficiency and reducing energy consumption are key to improving overall production efficiency and reducing costs.

[0003] In traditional alcohol production technology, to achieve high-quality alcohol, a methanol column is typically installed after the distillation column to separate and remove methanol. However, this single methanol column configuration has limited separation efficiency and insufficient adjustment capabilities when faced with fluctuations in feedstock composition or changes in production demand. This makes it difficult to quickly adapt to production changes, potentially leading to decreased product stability and substandard quality.

[0004] To address this issue, simply increasing the number of methanol columns to improve methanol separation efficiency will lead to higher energy consumption and increased production costs. Therefore, optimizing energy efficiency and effectively controlling costs are crucial. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the present application provides a device for producing high-grade alcohol by nine-tower differential pressure distillation of double crude, double refined, and double methanol, which adopts the following technical solution:

[0006] A device for producing high-grade alcohol by nine-tower differential pressure distillation of double crude, double refined, double methanol, comprises a crude tower, an aldehyde removal tower, a water washing tower, a refined tower, a first methanol tower and a second methanol tower connected in sequence through pipelines, wherein the gas outlet at the top of the first methanol tower is connected to the gas inlet of a reboiler of the second methanol tower, and the gas outlet of the reboiler of the second methanol tower is connected to the gas inlet of the second methanol tower; the gas outlet at the top of the second methanol tower is connected to the gas inlet of the reboiler of the aldehyde removal tower, and the gas outlet of the reboiler of the aldehyde removal tower is connected to the gas inlet at the top of the aldehyde removal tower.

[0007] By adopting the above technical solution, two methanol towers are set up, wherein the hot steam at the top of the first methanol tower heats the second methanol tower through the second methanol tower reboiler, and the hot steam at the top of the second methanol tower heats the aldehyde discharge tower through the aldehyde discharge tower reboiler; this solution realizes heat recovery and utilization and reduces energy consumption under the premise of adding a methanol tower.

[0008] Preferably, the crude tower includes a normal pressure crude tower and a negative pressure crude tower, and the liquid outlets of the normal pressure crude tower and the negative pressure crude tower are connected to the liquid inlet of the aldehyde removal tower through a pipeline.

[0009] Preferably, the air outlet at the top of the atmospheric pressure crude tower is connected to the air inlet of the negative pressure crude tower reboiler, and the air outlet of the negative pressure crude tower reboiler is connected to the air inlet of the negative pressure crude tower; the air outlet at the top of the negative pressure crude tower is connected to the air inlet of the second methanol tower reboiler, and the air outlet of the second methanol tower reboiler is connected to the air inlet of the second methanol tower.

[0010] By adopting the above technical solution, the hot steam at the top of the atmospheric crude tower heats the negative pressure crude tower through the negative pressure crude tower reboiler, and the hot steam at the top of the negative pressure crude tower heats the second methanol tower through the second methanol tower reboiler. Through the above arrangement, the steam from the negative pressure crude tower and the first methanol tower simultaneously supplies heat to the second methanol tower, thereby meeting the heat demand of the newly added methanol tower as much as possible.

[0011] Preferably, the air outlet at the top of the water washing tower is connected to the air inlet of the negative pressure crude tower reboiler, and the air outlet of the negative pressure crude tower reboiler is connected to the air inlet of the negative pressure crude tower.

[0012] By adopting the above technical solution, the steam from the atmospheric pressure crude tower and the water washing tower simultaneously supplies heat to the negative pressure crude tower.

[0013] Preferably, the refinement tower is configured as two refinement towers and one refinement tower connected in sequence by pipelines, the liquid outlet of the water washing tower is connected to the liquid inlet of the second refinement tower, and the liquid outlet of the second refinement tower is connected to the liquid inlet of the first refinement tower; the liquid outlet of the side line of the first refinement tower is connected to the liquid inlet of the first methanol tower.

[0014] Preferably, the steam at the top of the first fine tower is divided into two parts, the first part is connected to the air inlet of the second fine tower reboiler, and the air outlet of the second fine tower reboiler is connected to the air inlet of the second fine tower; the second part is connected to the air inlet of the atmospheric pressure crude tower reboiler, and the air outlet of the atmospheric pressure crude tower reboiler is connected to the air inlet of the atmospheric pressure crude tower.

[0015] By adopting the above technical solution, the hot steam at the top of the first fine tower simultaneously supplies heat to the second fine tower and the atmospheric pressure crude tower, thereby achieving efficient use of heat.

[0016] Preferably, the air outlet at the top of the second refiner is connected to the air inlet of the water scrubber reboiler, and the air outlet of the water scrubber reboiler is connected to the air inlet of the water scrubber.

[0017] Preferably, the device for producing high-grade alcohol by double crude, double refined, double methanol nine-tower differential pressure distillation also includes a recovery tower, and the steam at the top of the first methanol tower and the steam at the top of the second methanol tower are connected to the liquid inlet of the recovery tower after condensation; the liquid outlet at the upper part of the recovery tower is connected to the liquid inlet of the water washing tower through a pipeline.

[0018] By adopting the above technical solution, a recovery tower is set up. The feed is alcohol with higher impurities from the first methanol tower and the second methanol tower. Through distillation, waste water is discharged from the bottom, and alcohol with better quality is extracted in the middle and upper part of the tower and enters the dilution tower, and fusel oil is extracted in the middle and lower part of the tower.

[0019] Preferably, the gas outlet at the top of the recovery tower is connected to the gas inlet of the first methanol tower reboiler, and the gas outlet of the first methanol tower reboiler is connected to the gas inlet of the first methanol tower.

[0020] By adopting the above technical solution, the hot steam from the recovery tower can provide heat to the first methanol tower.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. By setting up two methanol towers, the hot steam at the top of the first methanol tower heats the second methanol tower through the second methanol tower reboiler, and the hot steam at the top of the second methanol tower heats the aldehyde discharge tower through the aldehyde discharge tower reboiler; this scheme realizes heat recovery and utilization and reduces energy consumption under the premise of adding a methanol tower; by setting the hot steam at the top of the atmospheric pressure crude tower to heat the negative pressure crude tower through the negative pressure crude tower reboiler, the hot steam at the top of the negative pressure crude tower heats the second methanol tower through the second methanol tower reboiler, the steam from the negative pressure crude tower and the first methanol tower simultaneously supply heat to the second methanol tower, thereby meeting the heat demand of the newly added methanol tower as much as possible.

[0023] 2. By setting up a recovery tower, the feed is alcohol with higher impurities from the first and second methanol towers. Through distillation, waste water is discharged from the bottom, and alcohol with better quality is extracted in the middle and upper part of the tower and enters the dilution tower, and fusel oil is extracted in the middle and lower part of the tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 : Schematic diagram of the device for producing high-grade alcohol by nine-tower differential pressure distillation of double crude, double refined, double methanol based on the flow of materials.

[0025] Figure 2 : Schematic diagram of the device for producing high-grade alcohol by double crude, double refined, double methanol nine-tower differential pressure distillation based on steam direction.

[0026] Figure 3 : Flow chart of steam flow in this application.

[0027] Explanation of the accompanying symbols: 1. Atmospheric pressure crude tower; 2. Negative pressure crude tower; 3. Aldehyde discharge tower; 4. Water washing tower; 5. Second refinement tower; 6. First refinement tower; 7. First methanol tower; 8. Second methanol tower; 9. Recovery tower; 10. Reboiler for atmospheric pressure crude tower; 11. Reboiler for negative pressure crude tower; 12. Reboiler for aldehyde discharge tower; 13. Reboiler for water washing tower; 14. Reboiler for second refinement tower; 15. Reboiler for first methanol tower; 16. Reboiler for second methanol tower. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-3 This application is described in further detail.

[0029] The present application discloses a device for producing high-grade alcohol by using a nine-tower differential pressure distillation method with double crude, double refined and double methanol.

[0030] Reference Figure 1 A device for producing high-grade alcohol by double crude, double refined, double methanol nine-tower differential pressure distillation comprises two crude towers, an aldehyde removal tower 3, a water washing tower 4, two refined towers, a first methanol tower 7, a second methanol tower 8 and a recovery tower 9; wherein the two crude towers are an atmospheric pressure crude tower 1 and a negative pressure crude tower 2, the liquid outlets of the atmospheric pressure crude tower 1 and the negative pressure crude tower 2 are connected to the liquid inlet of the aldehyde removal tower 3 through a pipeline; the liquid outlet at the bottom of the aldehyde removal tower 3 is connected to the liquid inlet of the water washing tower 4, and the wine vapor at the top of the aldehyde removal tower 3 containing high concentration of low boiling point aldehydes is sent to the fermentation mash section and enters the atmospheric pressure crude tower 1 or the negative pressure crude tower 2 together with the fermentation mash; the liquid vapor at the bottom of the water washing tower 4 is connected to the liquid inlet of the water washing tower 4, and the wine vapor at the top of the aldehyde removal tower 3 containing high concentration of low boiling point aldehydes is sent to the fermentation mash section and enters the atmospheric pressure crude tower 1 or the negative pressure crude tower 2 together with the fermentation mash; The liquid outlet is connected to the liquid inlet of the second refined tower 5; the liquid outlet at the bottom of the second refined tower 5 is connected to the liquid inlet of the first refined tower 6, and the liquid outlet of the side line of the first refined tower 6 is connected to the liquid inlet of the first methanol tower 7. The wine gas at the top of the second refined tower 5 is condensed and refluxed into the second refined tower 5, and the wine gas at the top of the first refined tower 6 is condensed and refluxed into the first refined tower 6; the liquid outlet at the bottom of the first methanol tower 7 is connected to the liquid inlet of the second methanol tower 8, and the steam at the top of the second methanol tower 8 and the first methanol tower 7 enters the liquid inlet of the recovery tower 9 after condensation, and the liquid outlet in the upper and middle part of the recovery tower 9 is connected to the liquid inlet of the water washing tower 4 through a pipeline.

[0031] The steam flow direction of the double crude double refined double methanol nine-tower differential pressure distillation to produce high-grade alcohol is referred to as follows: Figure 2 and Figure 3The first refinery tower 6 and the recovery tower 9 are heated by primary steam. The steam at the top of the first refinery tower 6 is divided into two parts. The first part is connected to the air inlet of the second refinery tower reboiler 14, and the air outlet of the second refinery tower reboiler 14 is connected to the air inlet of the second refinery tower 5; the second part is connected to the air inlet of the atmospheric crude tower reboiler 10, and the air outlet of the atmospheric crude tower reboiler 10 is connected to the air inlet of the atmospheric crude tower 1. The air outlet at the top of the second refinery tower 5 is connected to the air inlet of the water scrubber reboiler 13, and the air outlet of the water scrubber reboiler 13 is connected to the air inlet of the water scrubber 4. The air outlet at the top of the water scrubber 4 is connected to the air inlet of the negative pressure crude tower reboiler 11, and the air outlet of the negative pressure crude tower 2 is connected to the air inlet of the negative pressure crude tower 2. The air outlet at the top of the atmospheric crude tower 1 is connected to the air inlet of the negative pressure crude tower reboiler 11, which is in turn connected to the air inlet of the negative pressure crude tower 2. The air outlet at the top of the negative pressure crude tower 2 is connected to the air inlet of the second methanol tower reboiler 16, which is in turn connected to the air inlet of the second methanol tower 8. The air outlet at the top of the recovery tower 9 is connected to the air inlet of the first methanol tower reboiler 15, which is in turn connected to the air inlet of the first methanol tower 7. The air outlet at the top of the first methanol tower 7 is connected to the air inlet of the second methanol tower reboiler 16, which is in turn connected to the air inlet of the second methanol tower 8. The air outlet at the top of the second methanol tower 8 is connected to the air inlet of the aldehyde removal tower reboiler 12, which is in turn connected to the air inlet at the top of the aldehyde removal tower 3.

[0032] Working Principle: During use, the mature fermented mash from the fermentation section is divided into two parts. One part is pumped into the atmospheric pressure crude tower 1, and the other part flows into the negative pressure crude tower 2. The crude alcohol in the mash is separated from the lees by distillation. The lees are discharged at the bottom of the tower. The crude alcohol vapor enters the aldehyde removal tower 3. The dealdehydeated alcohol at the bottom of the aldehyde removal tower 3 is preheated and then enters the water washing tower 4. After water washing, relatively pure light alcohol is obtained at the bottom of the tower. After being pumped and metered, it enters the secondary refinement tower 5. The alcohol vapor at the top of the secondary refinement tower 5 provides heat to the water washing tower 4 through the water washing tower reboiler 13. The alcohol vapor at the top of the water washing tower 4 serves as the heat source for the negative pressure crude tower 2. The secondary refinement tower 5 produces a portion of ordinary alcohol. The remaining alcohol is preheated in the form of light alcohol at the bottom of the secondary refinement tower 5 and enters the primary refinement tower 6. After distillation, fusel oil is produced in the middle and lower part of the primary refinement tower 6, and ordinary alcohol is produced in the side line at the top of the tower. Wastewater is discharged at the bottom of the primary refinement tower 6. The steam at the top of the first refined tower 6 is divided into two parts. One part is used to supply heat to the second refined tower 5 through the second refined tower reboiler 14, and the other part is used to supply heat to the atmospheric crude tower 1 through the atmospheric crude tower reboiler 10.

[0033] The purpose of the methanol removal tower is to exploit the increased distillation coefficient of methanol at high alcohol concentrations. Uncondensed alcohol vapor is removed by extracting the head and venting it in an auxiliary condenser, extracting high-quality alcohol at the bottom of the tower. To conserve energy and facilitate operation, the methanol removal tower is divided into two units: one operating at a slightly positive pressure and the other at a negative pressure. The two towers are thermally coupled. The first methanol tower 7 is heated by utilizing alcohol vapor from the top of the recovery tower 9 through the first methanol tower reboiler 15 to supply heat to the first methanol tower. The alcohol vapor from the top of the first methanol tower 7 heats the second methanol tower 8. The hot vapor from the top of the second methanol tower 8 heats the aldehyde removal tower 3 through the aldehyde removal tower reboiler 12. The recovery tower 9 operates at positive pressure and is fed with light alcohol from the alcohol and fusel oil separators in each tower, which contain high levels of impurities. Through distillation, wastewater is discharged from the bottom. High-quality alcohol is extracted in the upper-middle portion of the tower and fed to the water scrubber 4. Fusel oil is extracted in the lower-middle portion of the tower and fed to the fusel oil separator.

[0034] The device for preparing premium-grade alcohol by double crude double refined double methanol nine-tower differential pressure distillation of the present application has a methanol content of 5 mg / 100 mL in the premium-grade alcohol produced after adding a methanol tower. When only one methanol tower is set, the methanol content in the premium-grade alcohol produced is 42 mg / 100 mL; the gas consumption per ton of premium-grade alcohol in the device for preparing premium-grade alcohol by double crude double refined double methanol nine-tower differential pressure distillation of the present application is basically the same as that of the device without the additional methanol tower, but the methanol content in the produced premium-grade alcohol is reduced by 88%.

Claims

1. A device for producing high-grade alcohol by nine-tower differential pressure distillation of double crude, double refined, and double methanol, characterized by: The invention comprises a crude tower, an aldehyde removal tower, a water washing tower, a fine tower, a first methanol tower and a second methanol tower which are connected in sequence through pipelines. The gas outlet at the top of the first methanol tower is connected to the gas inlet of the reboiler of the second methanol tower, and the gas outlet of the reboiler of the second methanol tower is connected to the gas inlet of the second methanol tower; the gas outlet at the top of the second methanol tower is connected to the gas inlet of the reboiler of the aldehyde removal tower, and the gas outlet of the reboiler of the aldehyde removal tower is connected to the gas inlet at the top of the aldehyde removal tower.

2. The device for producing high-grade alcohol by nine-tower differential pressure distillation of double crude, double refined, double methanol according to claim 1, characterized in that: The crude tower includes a normal pressure crude tower and a negative pressure crude tower, and the liquid outlets of the normal pressure crude tower and the negative pressure crude tower are connected to the liquid inlet of the aldehyde removal tower through pipelines.

3. The device for producing high-grade alcohol by nine-tower differential pressure distillation of double crude, double refined, double methanol according to claim 2, characterized in that: The air outlet at the top of the atmospheric crude tower is connected to the air inlet of the negative pressure crude tower reboiler, and the air outlet of the negative pressure crude tower reboiler is connected to the air inlet of the negative pressure crude tower; the air outlet at the top of the negative pressure crude tower is connected to the air inlet of the second methanol tower reboiler, and the air outlet of the second methanol tower reboiler is connected to the air inlet of the second methanol tower.

4. The device for producing high-grade alcohol by nine-tower differential pressure distillation of double crude, double refined, double methanol according to claim 2, characterized in that: The air outlet at the top of the water washing tower is connected to the air inlet of the negative pressure crude tower reboiler, and the air outlet of the negative pressure crude tower reboiler is connected to the air inlet of the negative pressure crude tower.

5. The device for producing high-grade alcohol by nine-tower differential pressure distillation of double crude, double refined, double methanol according to claim 1, characterized in that: The refinement tower is configured as two refinement towers and one refinement tower connected in sequence by pipelines. The liquid outlet of the water washing tower is connected to the liquid inlet of the second refinement tower, and the liquid outlet of the second refinement tower is connected to the liquid inlet of the first refinement tower; the liquid outlet of the side line of the first refinement tower is connected to the liquid inlet of the first methanol tower.

6. The device for producing high-grade alcohol by nine-tower differential pressure distillation of double crude, double refined, double methanol according to claim 5, characterized in that: The steam at the top of the first refined tower is divided into two parts. The first part is connected to the air inlet of the second refined tower reboiler, and the air outlet of the second refined tower reboiler is connected to the air inlet of the second refined tower; the second part is connected to the air inlet of the atmospheric pressure crude tower reboiler, and the air outlet of the atmospheric pressure crude tower reboiler is connected to the air inlet of the atmospheric pressure crude tower.

7. The device for producing high-grade alcohol by nine-tower differential pressure distillation of double crude, double refined, double methanol according to claim 6, characterized in that: The air outlet at the top of the secondary refiner is connected to the air inlet of the water scrubber reboiler, and the air outlet of the water scrubber reboiler is connected to the air inlet of the water scrubber.

8. The device for producing high-grade alcohol by nine-tower differential pressure distillation of double crude, double refined, double methanol according to claim 1, characterized in that: It also includes a recovery tower. The steam at the top of the first methanol tower and the steam at the top of the second methanol tower are connected to the liquid inlet of the recovery tower after condensation; the liquid outlet at the upper part of the recovery tower is connected to the liquid inlet of the water washing tower through a pipeline.

9. The device for producing high-grade alcohol by nine-tower differential pressure distillation of double crude, double refined, double methanol according to claim 8, characterized in that: The gas outlet at the top of the recovery tower is connected to the gas inlet of the reboiler of the first methanol tower, and the gas outlet of the reboiler of the first methanol tower is connected to the gas inlet of the first methanol tower.