White spirit purification system

Abstract

The utility model discloses a white spirit purification system which comprises a fermentation mash raw material tank, a coarse distillation tower, a first rectifying tower and a second rectifying tower which are connected in sequence, a fusel oil discharge port in the middle of the first rectifying tower is communicated with a fusel oil rectifying tower, and a gas discharge port in the top of the fusel oil rectifying tower is connected with a first feed port of a heat exchanger. A first discharge port of the heat exchanger is connected with the light alcohol reflux tank, a second feed port of the heat exchanger is connected with a discharge port at the bottom of the second rectifying tower, and a second discharge port of the heat exchanger is connected with a first feed port at the bottom of the second rectifying tower. The fusel oil rectifying tower is used for replacing a fusel oil extraction tower or a fusel oil separation tank in the prior art, so that the normal propyl alcohol with relatively high concentration is prevented from being contained in the extracted light alcohol, the enrichment of the normal propyl alcohol is not caused even if the light alcohol flows back to the first rectifying tower, and the quality of the produced alcohol is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy-saving production of liquor purification, and particularly relates to a liquor purification system. Background Art

[0002] Fermented alcohol is an important renewable basic raw material and product. According to different usage functions, it is divided into fuel ethanol and brewing edible alcohol (referred to as edible alcohol) products. Fuel ethanol is mainly used as fuel and has low requirements for general impurities such as aldehydes and methanol. Edible alcohol is mainly used for modulating beverage wine and chemical raw materials, etc. The volume concentration of water content is generally required to be lower than 5%, and strict requirements are imposed on the impurity content.

[0003] Edible alcohol, such as liquor, will produce fusel oil during the distillation process. Fusel oil is a transparent liquid from light yellow to brownish brown and is a high-boiling-point substance, mainly composed of isopentanol, isobutanol, n-propanol, isopropanol, etc. The conventional method for extracting fusel oil is: using water as the extractant in the extraction tower for oil-water separation, and the light alcohol is returned to the tower for re-distillation. Since n-propanol is miscible with both water and isopentanol and isobutanol, it is difficult to separate n-propanol inside and outside the tower. Therefore, n-propanol will circulate between the rectification tower and the fusel oil extraction tower, resulting in the accumulation of n-propanol in the rectification tower, so that the middle and top of the rectification tower have a high concentration of n-propanol. Chinese Patent 202120564292.7 discloses an energy-saving device for purifying fermentation broth to produce fuel ethanol. This utility model sets up a fusel oil extraction tower, and it is difficult to separate n-propanol in the obtained light alcohol. Summary of the Utility Model

[0004] In view of the above-mentioned prior art, the purpose of the present utility model is to provide a liquor purification system. The present utility model uses a fusel oil rectification tower to replace the fusel oil extraction tower or fusel oil separation tank in the prior art, avoiding the high concentration of n-propanol in the extracted light alcohol. Even if the light alcohol is refluxed to the first rectification tower, it will not cause the enrichment of n-propanol, improving the quality of the produced alcohol.

[0005] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0006] A liquor purification system includes a fermentation mash raw material tank, a rough distillation tower, a first rectification tower, and a second rectification tower connected in sequence. The fusel oil discharge port in the middle of the first rectification tower is connected to a fusel oil rectification tower. The gas discharge port at the top of the fusel oil rectification tower is connected to the first feed port of a heat exchanger. The first discharge port of the heat exchanger is connected to a light alcohol reflux tank. The second feed port of the heat exchanger is connected to the discharge port at the bottom of the second rectification tower. The second discharge port of the heat exchanger is connected to the first feed port at the bottom of the second rectification tower. The discharge port in the middle of the fusel oil rectification tower is connected to a fusel oil tank.

[0007] After the white liquor fermentation mash is roughly distilled by the rough distillation column, the low-boiling substances containing ethanol enter the first rectification column. The fusel oil including n-propanol and part of ethanol are drawn from the middle of the first rectification column and enter the fusel oil rectification column. The ethanol in the fusel oil rectification column enters the heat exchanger as a heat source through the discharge port at the top of the fusel oil, heats the high-boiling components at the bottom of the second rectification column and then enters the light alcohol reflux tank, which not only avoids the enrichment of n-propanol in the rectification column but also saves resources such as the heating steam used in the second rectification column. Finally, n-propanol and the remaining fusel oil components are drawn from the middle of the fusel oil rectification column and enter the fusel oil tank.

[0008] Preferably, a first preheater and a second preheater are successively connected between the fermentation mash raw material tank and the feed port of the rough distillation column.

[0009] In this preferred solution, two-stage preheating is adopted. The heat source of the first preheater is the low-boiling substances of the second rectification column, and the heat source of the second preheater is the high-boiling substances of the rough distillation column, which can save the usage amount of condensed water and steam.

[0010] Preferably, the discharge port at the top of the rough distillation column is connected to the first feed port of the first rectification column, and the discharge port at the bottom of the rough distillation column is connected to the first feed port of the gas-liquid separator.

[0011] In this preferred solution, the low-boiling components in the rough distillation column enter the first rectification column for rectification, and the high-boiling components enter the gas-liquid separator to separate out aroma substances and residual liquid. Among them, the aroma substances are refluxed to the main rectification process to ensure the aroma of the white liquor.

[0012] Preferably, the gas discharge port at the top of the first rectification column is connected to the first feed port of the second rectification column, and the discharge port at the bottom of the first rectification column is connected to the second feed port of the gas-liquid separator.

[0013] In this preferred solution, the low-boiling components in the first rectification column enter the second rectification column for rectification, and the high-boiling components at the bottom enter the gas-liquid separator to also separate out aroma substances and residual liquid, ensuring the aroma of the white liquor.

[0014] Preferably, the gas discharge port of the gas-liquid separator is successively connected to the flavor condenser, the flavor buffer tank and the second feed port of the first rectification column.

[0015] In this preferred solution, the gas-liquid separator can separate the aroma substances such as ethyl acetate that have not volatilized in the high-boiling components of the rough distillation column from the liquid such as lactic acid, and enter the rectification column through the flavor condenser and the flavor buffer tank, which can ensure the white liquor flavor during the rectification process of the white liquor.

[0016] Preferably, the gas discharge port at the top of the second rectification column is successively connected to the first preheater, the condenser group, the reflux tank and the reflux feed port at the top of the second rectification column.

[0017] In this preferred solution, the low-boiling components of the second rectification column enter the first preheater as a heat source to preheat the raw materials, and then are cooled and refluxed to the second rectification column through the condenser group and the reflux drum, enabling the recovery of ethanol therein.

[0018] Preferably, the finished product discharge port in the middle of the second rectification column is successively connected to the finished product condenser and the white liquor alcohol finished product tank.

[0019] In this preferred solution, the finished product white liquor alcohol passes through the finished product discharge port in the middle of the second rectification column, is cooled to a liquid by the finished product condenser, and then enters the white liquor alcohol finished product tank, which is convenient for storage and saves space.

[0020] Preferably, a fusel oil condenser is also connected between the fusel oil rectification column and the fusel oil tank.

[0021] In this preferred solution, the fusel oil condenser can cool the fusel oil to a liquid and then discharge it into the fusel oil tank, which is convenient for storage and saves space.

[0022] Preferably, the discharge port of the light alcohol reflux drum is connected to the third feed port of the first rectification column.

[0023] The beneficial effects of the present utility model:

[0024] (1) The present utility model uses a fusel oil rectification column to replace the fusel oil extraction column or the fusel oil separation tank in the prior art, avoiding the high concentration of n-propanol in the extracted light alcohol. Even if the light alcohol is refluxed to the first rectification column, it will not cause the enrichment of n-propanol, improving the quality of the produced alcohol. In addition, the ethanol in the fusel oil can be recovered as industrial alcohol at the top of the fusel oil rectification column, and the ethanol can also be used as a heat source for reheating the high-component liquid at the bottom of the second rectification column, saving steam resources and reducing costs.

[0025] (2) The present utility model is provided with an aroma retention device and a gas-liquid separator between the rough distillation column and the rectification column. While recovering the aroma substances in the residual liquid, the residual heat of the residual liquid is used to preheat the fermentation mash, saving the consumption of steam. The aroma substances are refluxed to the main purification process through the aroma condenser and the aroma buffer tank, reducing the aroma loss during the white liquor distillation process. The finally produced finished white liquor has a strong fruity aroma, is not astringent, and has no peculiar smell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the process flow chart of the present utility model.

[0027] Among them, 1 - crude distillation column, 2 - first rectification column, 3 - second rectification column, 4 - gas-liquid separator, 5 - fusel oil separator, 6 - fusel oil tank, 7 - fermentation mash raw material tank, 8 - first preheater, 9 - second preheater, 10 - flavor condenser, 11 - flavor buffer tank, 12 - fusel oil recovery tank, 13 - fusel oil rectification column, 14 - reflux tank, 15 - finished product tank for liquor alcohol, 16 - heat exchanger, 17 - light alcohol reflux tank, 18 - condenser group. Detailed implementation manners

[0028] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanations for this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0029] In order to enable those skilled in the art to more clearly understand the technical solutions of this application, the technical solutions of this application will be described in detail below in conjunction with specific embodiments.

[0030] As Figure 1 described, this embodiment provides a purification system for liquor fermentation mash, including:

[0031] A fermentation mash raw material tank 7, a crude distillation column 1, a first rectification column 2, and a second rectification column 3 connected in sequence.

[0032] A first preheater 8 and a second preheater 9 are sequentially connected between the fermentation mash raw material tank 7 and the feed inlet of the crude distillation column 1. The discharge port at the top of the crude distillation column 1 is connected to the first feed inlet of the first rectification column 2, and the discharge port at the bottom of the crude distillation column 1 is connected to the first feed inlet of the gas-liquid separator 4.

[0033] The gas discharge port of the gas-liquid separator 4 is sequentially connected to the flavor condenser 10, the flavor buffer tank 11, and the second feed inlet of the first rectification column 2.

[0034] The fusel oil discharge port in the middle of the first rectification column 2 is communicated with the fusel oil rectification column 13. The gas discharge port at the top of the fusel oil rectification column 13 is connected to the first feed inlet of the heat exchanger 16. The first discharge port of the heat exchanger 16 is connected to the light alcohol reflux tank 17. The discharge port of the light alcohol reflux tank 17 is connected to the third feed inlet of the first rectification column 2. The second feed inlet of the heat exchanger 16 is connected to the discharge port at the bottom of the second rectification column 3. The second discharge port of the heat exchanger 16 is connected to the first feed inlet at the bottom of the second rectification column 3. The discharge port in the middle of the fusel oil rectification column 13 is connected to the fusel oil tank 6. A fusel oil condenser 5 is also connected between the fusel oil rectification column 13 and the fusel oil tank 6.

[0035] The gas outlet at the top of the first rectification column 2 is connected to the first feed inlet of the second rectification column 3, and the outlet at the bottom of the first rectification column 2 is connected to the second feed inlet of the gas-liquid separator 4.

[0036] The gas outlet at the top of the second rectification column 3 is sequentially connected to the first preheater 8, the condenser group 18, the reflux drum 14, and the reflux feed inlet at the top of the second rectification column 3. The finished product outlet in the middle of the second rectification column 3 is sequentially connected to the finished product condenser and the white spirit alcohol finished product tank 15.

[0037] The operation process of the present utility model:

[0038] The white spirit fermentation mash starts from the fermentation mash raw material tank 7, is preheated in two stages through the first preheater 8 and the second preheater 9 and enters the rough distillation column 1. After distillation in the column, the low-boiling components enter the first feed inlet of the first rectification column 2 from the outlet at the top of the rough distillation column 1, and the high-boiling components enter the gas-liquid separator 4 to separate the residual liquid and the aroma substances. Among them, the aroma substances such as ethyl acetate enter the second feed inlet of the first rectification column 2 through the flavor condenser 10 and the flavor buffer tank 11; the liquid first enters the second preheater 9 as a heat source to preheat the white spirit fermentation mash, and then is discharged as the residual liquid.

[0039] The fusel oil is extracted from the middle of the first rectification column 2 and then enters the fusel oil rectification column 13. The low-boiling components such as ethanol in the fusel oil rectification column 13 enter the heat exchanger 16 as a heat source from the outlet at the top of the fusel oil, heat the high-boiling components at the bottom of the second rectification column 3 and then enter the light alcohol reflux drum 17, and then are recycled to the first rectification column 2 for continuous distillation; n-propanol and the remaining fusel oil components are extracted from the middle of the fusel oil rectification column and enter the fusel oil tank. The low-boiling components at the top of the first rectification column 2 enter the second rectification column 3, and the high-boiling components at the bottom enter the gas-liquid separator 4, and are also separated into aroma substances and residual liquid.

[0040] The high-boiling components at the bottom of the second rectification column 3 enter the first rectification column 2, and the low-boiling components at the top first enter the first preheater 8 to provide heat for preheating the white spirit fermentation mash, and then are refluxed to the second rectification column through the condenser group 18 and the reflux drum 14 in sequence, and the finished white spirit alcohol is extracted from the middle of the second rectification column 3.

[0041] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A liquor purification system, comprising a fermented mash raw material tank (7), a crude distillation tower (1), a first distillation tower (2) and a second distillation tower (3) connected in sequence, characterized in that: The fusel oil outlet in the middle of the first distillation tower (2) is connected to the fusel oil distillation tower (13), the gas outlet at the top of the fusel oil distillation tower (13) is connected to the first feed port of the heat exchanger (16), the first feed port of the heat exchanger (16) is connected to the dilute alcohol reflux tank (17), the second feed port of the heat exchanger (16) is connected to the outlet at the bottom of the second distillation tower (3), and the second outlet of the heat exchanger (16) is connected to the first feed port at the bottom of the second distillation tower (3).

2. The liquor purification system according to claim 1, characterized in that: A first preheater (8) and a second preheater (9) are connected in sequence between the fermented mash raw material tank (7) and the feed inlet of the crude distillation tower (1).

3. The liquor purification system according to claim 1, characterized in that: The discharge port at the top of the crude distillation tower (1) is connected to the first feed port of the first rectification tower (2), and the discharge port at the bottom of the crude distillation tower (1) is connected to the first feed port of the gas-liquid separator (4).

4. The liquor purification system according to claim 1, characterized in that: The gas outlet at the top of the first distillation tower (2) is connected to the first feed inlet of the second distillation tower (3), and the outlet at the bottom of the first distillation tower (2) is connected to the second feed inlet of the gas-liquid separator (4).

5. The liquor purification system according to claim 3 or 4, characterized in that: The gas outlet of the gas-liquid separator (4) is connected in sequence to the aroma condenser (10), the aroma buffer tank (11) and the second feed inlet of the first distillation tower (2).

6. The liquor purification system according to claim 1, characterized in that: The gas outlet at the top of the second distillation tower (3) is connected in sequence to the first preheater (8), the condenser group (18), the reflux tank (14) and the reflux feed port at the top of the second distillation tower (3).

7. The liquor purification system according to claim 1, characterized in that: The finished product discharge port in the middle of the second distillation tower (3) is connected in sequence to the finished product condenser and the finished liquor alcohol tank (15).

8. The liquor purification system according to claim 1, characterized in that: A fusel oil condenser (5) is also connected between the fusel oil distillation tower (13) and the fusel oil tank (6).

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