A method and apparatus for distilling white spirit by liquid method

Abstract

The present invention discloses a method and a device for distilling liquid-process white liquor, belonging to the technical field of white liquor production. When the temperature at the top of the first distillation column rises to 85°C to 90°C, the obtained first steam mixture is condensed and introduced into the second distillation column. When the temperature at the top of the second distillation column rises to 70°C to 75°C, the obtained first liquid mixture is introduced into the third distillation column. When the temperature at the top of the third distillation column rises to 80°C to 85°C, the obtained second liquid mixture is introduced into the fourth distillation column. When the temperature at the top of the fourth distillation column rises to 90°C to 95°C, the obtained third liquid mixture and the second steam mixture in the third distillation column are introduced into the fifth distillation column. When the temperature at the top of the fifth distillation column rises to 85°C to 90°C, the obtained third steam mixture is obtained. It not only realizes the enrichment of beneficial flavor components and the removal of bad flavor components, but also realizes the continuous and high-efficiency production of white liquor.

Description

Technical Field

[0001] The invention relates to the technical field of liquor production, and in particular to a method and a device for distilling liquor using a liquid process. Background Art

[0002] Traditional liquor is mostly solid-state fermented, using retorts to distill solid materials to obtain liquor, and liquid fermentation products are mostly distilled using kettle distillation. With the development of distillation technology, liquid liquor or alcohol production also uses distillation towers to distill liquor. However, at present, neither kettle distillation nor tower distillation can achieve precise distillation, that is, it is impossible to retain as many beneficial flavor components as possible and remove as many harmful flavor components as possible at the same time. In addition, liquid kettle distillation requires secondary distillation to obtain high-concentration raw liquor, which has high energy consumption and low production efficiency.

[0003] Therefore, there is an urgent need for a method and device for liquid-based white spirit distillation that can simultaneously achieve continuous and efficient production of white spirit and enrichment of beneficial flavor components and removal of undesirable flavor components, so as to solve the above-mentioned technical problems existing in the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for distilling liquid-process white spirit, which can not only enrich beneficial flavor components and remove undesirable flavor components, but also realize continuous and efficient production of white spirit.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A method for distilling liquid white spirit, comprising:

[0007] Step S1, the fermentation liquid enters a first distillation tower, the pressure in the first distillation tower is atmospheric pressure, when the temperature of the top of the first distillation tower rises to 85° C. to 90° C., a first steam mixture is obtained, and the first steam mixture is drawn out from the top of the first distillation tower;

[0008] Step S2, the first steam mixture in step S1 is condensed and then enters a second distillation tower, the pressure in the second distillation tower is normal pressure, when the temperature of the top of the second distillation tower rises to 70° C. to 75° C., a first liquid mixture is obtained, and the first liquid mixture is drawn out from the bottom of the second distillation tower;

[0009] Step S3: The first liquid mixture in step S2 enters the third distillation column. The pressure in the third distillation column is atmospheric pressure. When the temperature at the top of the third distillation column rises to 80°C - 85°C, a second vapor mixture and a second liquid mixture are obtained. The second vapor mixture is drawn from the top of the third distillation column, and the second liquid mixture is drawn from the bottom of the third distillation column.

[0010] Step S4: The second liquid mixture in step S3 enters the fourth distillation column. The pressure in the fourth distillation column is atmospheric pressure. When the temperature at the top of the fourth distillation column rises to 90°C - 95°C, a third liquid mixture is obtained. The third liquid mixture is drawn from the bottom of the fourth distillation column.

[0011] Step S5: The second vapor mixture in step S3 is condensed and then enters the fifth distillation column. The third liquid mixture in step S4 enters the fifth distillation column. The pressure in the fifth distillation column is atmospheric pressure. When the temperature at the top of the fifth distillation column rises to 85°C - 90°C, a third vapor mixture is obtained. The third vapor mixture is drawn from the top of the fifth distillation column.

[0012] Step S6: The third vapor mixture is condensed to obtain the finished product solution.

[0013] As a preferred technical solution of the method for distilling white spirit by the liquid method, in step S1, when the liquid level of the mixed liquid at the bottom of the first distillation column reaches 50%, the first discharge valve at the bottom of the first distillation column is opened and discharged into the waste liquid tank.

[0014] As a preferred technical solution of the method for distilling white spirit by the liquid method, in step S2, when the liquid level of the first liquid mixture at the bottom of the second distillation column reaches 90%, the second discharge valve at the bottom of the second distillation column is opened and enters the third distillation column.

[0015] As a preferred technical solution of the method for distilling white spirit by the liquid method, in step S3, when the liquid level of the second liquid mixture at the bottom of the third distillation column reaches 90%, the third discharge valve at the bottom of the third distillation column is opened and enters the fourth distillation column.

[0016] As a preferred technical solution of the method for distilling white spirit by the liquid method, in step S4, when the liquid level of the third liquid mixture at the bottom of the fourth distillation column reaches 90%, the fourth discharge valve at the bottom of the fourth distillation column is opened and enters the fifth distillation column.

[0017] As a preferred technical solution of a method for distilling white spirit by the liquid method, in step S5, when the liquid level of the mixed liquid at the bottom of the fifth distillation column reaches 90%, open the fifth discharge valve at the bottom of the fifth distillation column and discharge it into the waste liquid tank.

[0018] To achieve the above object, the present invention also provides a device for distilling white spirit by the liquid method, which applies the method for distilling white spirit by the liquid method as described above. The device for distilling white spirit by the liquid method includes a first distillation column, a second distillation column, a third distillation column, a fourth distillation column, a fifth distillation column, a first reboiler, a second reboiler, a third reboiler, a fourth reboiler, a fifth reboiler, a first condenser, a second condenser, a third condenser, a fourth condenser and a fifth condenser. The first reboiler, the second reboiler, the third reboiler, the fourth reboiler and the fifth reboiler are respectively connected to the bottoms of the first distillation column, the second distillation column, the third distillation column, the fourth distillation column and the fifth distillation column;

[0019] The first condenser, the second condenser, the third condenser, the fourth condenser and the fifth condenser are respectively connected to the tops of the first distillation column, the second distillation column, the third distillation column, the fourth distillation column and the fifth distillation column;

[0020] The first condenser is connected to the second reboiler, the bottom of the second distillation column is connected to the third reboiler, the bottom of the third distillation column is connected to the fourth reboiler, the third condenser is connected to the fifth distillation column, and the bottom of the fourth distillation column is connected to the fifth reboiler.

[0021] As a preferred technical solution of a device for distilling white spirit by the liquid method, the device for distilling white spirit by the liquid method further includes a waste liquid tank, and the bottoms of the first distillation column and the fifth distillation column are both connected to the waste liquid tank.

[0022] As a preferred technical solution of a device for distilling white spirit by the liquid method, the device for distilling white spirit by the liquid method further includes a first collection tank, and the first collection tank is connected to the second condenser.

[0023] As a preferred technical solution of a device for distilling white spirit by the liquid method, the device for distilling white spirit by the liquid method further includes a second collection tank, and the second collection tank is connected to the fourth condenser.

[0024] The present invention provides a method and apparatus for distilling liquid-process white liquor. When the first vapor mixture obtained by distilling the fermentation broth in the first distillation column is condensed, it is mainly an ethanol solution of various organic substances. After distilling this solution in the second distillation column, most of the low-boiling harmful components such as methanol and acetaldehyde can be removed, and a first liquid mixture is obtained. The first liquid mixture is distilled in the third distillation column to obtain a second vapor mixture and a second liquid mixture. The second vapor mixture mainly contains beneficial flavor components between methanol and n-propanol and part of ethanol. The second vapor mixture enters the fifth distillation column for further distillation. The main components of the second liquid mixture are various higher alcohols, ethyl lactate, organic acids, and β-phenylethyl alcohol. The second liquid mixture enters the fourth distillation column for further distillation to remove most of the components of higher alcohols such as n-propanol, isobutanol, n-pentanol, and n-butanol, and a third liquid mixture mainly composed of ethyl lactate, organic acids, and β-phenylethyl alcohol is obtained. Moreover, the third liquid mixture and the condensed second vapor mixture are further distilled in the fifth distillation column to remove most of the harmful substances such as methanol, acetaldehyde, propanol, and n-propanol, and a third vapor mixture containing ethyl acetate, ethyl lactate, organic acids, and β-phenylethyl alcohol is obtained. The third vapor mixture is condensed to obtain the finished ethanol solution. By means of step-by-step distillation, harmful components are removed to obtain beneficial components, and there is no need for secondary distillation, enabling continuous and efficient production of white liquor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a schematic structural diagram of the apparatus for distilling liquid-process white liquor provided by the specific embodiment of the present invention.

[0026] Reference Signs:

[0027] 1, first distillation column; 2, second distillation column; 3, third distillation column; 4, fourth distillation column; 5, fifth distillation column; 6, first reboiler; 7, second reboiler; 8, third reboiler; 9, fourth reboiler; 10, fifth reboiler; 11, first condenser; 12, second condenser; 13, third condenser; 14, fourth condenser; 15, fifth condenser; 16, waste liquid tank; 17, first collection tank; 18, second collection tank; 19, raw material tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] In order to make the technical problems solved by the present invention, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0029] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top of", and "on the upper surface of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the bottom of", and "on the lower surface of" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0031] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, so it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0032] This embodiment provides a method for rectifying white spirit by the liquid method. The method for rectifying white spirit by the liquid method includes the following steps:

[0033] Step S1: The fermentation broth enters the first rectification tower 1. The pressure in the first rectification tower 1 is normal pressure. When the temperature at the top of the first rectification tower 1 rises to 85°C - 90°C, a first steam mixture is obtained, and the first steam mixture is led out from the top of the first rectification tower 1.

[0034] Preferably, in step S1, when the liquid level of the mixed liquid at the bottom of the first rectification tower 1 reaches 50%, the first discharge valve at the bottom of the first rectification tower 1 is opened. It should be noted that in other embodiments, the amount of the liquid level of the mixed liquid at the bottom of the first rectification tower 1 can be adjusted according to the actual situation, and the first discharge valve at the bottom of the first rectification tower 1 can be opened in a timely manner to discharge the waste liquid into the waste liquid tank 16.

[0035] Further preferably, in this embodiment, the temperature at the top of the first rectification tower 1 rises to 85°C to obtain a first steam mixture.

[0036] In step S2, the first steam mixture in step S1 enters the second rectification column 2 after condensation. The pressure in the second rectification column 2 is normal pressure. When the temperature at the top of the second rectification column 2 rises to 70°C - 75°C, a first liquid mixture is obtained, and the first liquid mixture is led out from the bottom of the second rectification column 2.

[0037] Preferably, in step S2, when the liquid level of the first liquid mixture at the bottom of the second rectification column 2 reaches 90%, the second discharge valve at the bottom of the second rectification column 2 is opened. It should be noted that in other embodiments, the amount of the liquid level of the mixed liquid at the bottom of the second rectification column 2 can be adjusted according to the actual situation, and the second discharge valve at the bottom of the second rectification column 2 can be opened in a timely manner and enter the third rectification column 3.

[0038] Further preferably, in step S2, when the temperature at the top of the second rectification column 2 rises to 70°C, a first liquid mixture is obtained.

[0039] In step S3, the first liquid mixture in step S2 enters the third rectification column 3. The pressure in the third rectification column 3 is normal pressure. When the temperature at the top of the third rectification column 3 rises to 80°C - 85°C, a second steam mixture and a second liquid mixture are obtained. The second steam mixture is led out from the top of the third rectification column 3, and the second liquid mixture is led out from the bottom of the third rectification column 3.

[0040] Preferably, in step S3, when the liquid level of the second liquid mixture at the bottom of the third rectification column 3 reaches 90%, the third discharge valve at the bottom of the third rectification column 3 is opened. It should be noted that in other embodiments, the amount of the liquid level of the mixed liquid at the bottom of the third rectification column 3 can be adjusted according to the actual situation, and the third discharge valve at the bottom of the third rectification column 3 can be opened in a timely manner and enter the fourth rectification column 4.

[0041] Further preferably, in step S3, when the temperature at the top of the third rectification column 3 rises to 80°C, a second steam mixture and a second liquid mixture are obtained.

[0042] In step S4, the second liquid mixture in step S3 enters the fourth rectification column 4. The pressure in the fourth rectification column 4 is normal pressure. When the temperature at the top of the fourth rectification column 4 rises to 90°C - 95°C, a third liquid mixture is obtained, and the third liquid mixture is led out from the bottom of the fourth rectification column 4.

[0043] Preferably, in step S4, when the liquid level of the third liquid mixture at the bottom of the fourth rectification column 4 reaches 90%, the fourth discharge valve at the bottom of the fourth rectification column 4 is opened. It should be noted that in other embodiments, the amount of the liquid level of the mixed liquid at the bottom of the fourth rectification column 4 can be adjusted according to the actual situation, and the fourth discharge valve at the bottom of the fourth rectification column 4 can be opened in a timely manner and enter the fifth rectification column 5.

[0044] Further preferably, in step S4, when the temperature at the top of the fourth rectification column 4 rises to 90 °C, a third liquid mixture is obtained.

[0045] Step S5: The second steam mixture in step S3 is condensed and then enters the fifth rectification column 5. The third liquid mixture in step S4 enters the fifth rectification column 5. The pressure in the fifth rectification column 5 is normal pressure. When the temperature at the top of the fifth rectification column 5 rises to 85 °C - 90 °C, a third steam mixture is obtained, and the third steam mixture is led out from the top of the fifth rectification column 5;

[0046] Preferably, in step S5, when the liquid level of the mixed liquid at the bottom of the fifth rectification column 5 reaches 90%, the fifth discharge valve at the bottom of the fifth rectification column 5 is opened. It should be noted that in other embodiments, the amount of the liquid level of the mixed liquid at the bottom of the fifth rectification column 5 can be adjusted according to the actual situation, and the fifth discharge valve at the bottom of the fifth rectification column 5 can be opened in a timely manner to discharge the waste liquid into the waste liquid tank 16.

[0047] Further preferably, in step S5, when the temperature at the top of the fifth rectification column 5 rises to 85 °C, a third steam mixture is obtained.

[0048] Step S6: The third steam mixture is condensed to obtain a finished product solution.

[0049] When the first vapor mixture obtained by distilling the fermentation broth in the first distillation column 1 is condensed, it is mainly an ethanol solution of various organic substances with an alcohol content of about 95°. After distilling this solution in the second distillation column 2, most of the low-boiling harmful components such as methanol and acetaldehyde can be removed, and a first liquid mixture is obtained. The first liquid mixture is distilled in the third distillation column 3 to obtain a second vapor mixture and a second liquid mixture. The second vapor mixture mainly contains beneficial flavor components between methanol and n-propanol and some ethanol. The second vapor mixture enters the fifth distillation column 5 for further distillation. The main components of the second liquid mixture are various higher alcohols, ethyl lactate, organic acids, and β-phenylethyl alcohol. The second liquid mixture enters the fourth distillation column 4 for further distillation to remove most of the components of higher alcohols such as n-propanol, isobutanol, n-pentanol, and n-butanol, and a third liquid mixture mainly composed of ethyl lactate, organic acids, and β-phenylethyl alcohol is obtained. Moreover, the third liquid mixture and the condensed second vapor mixture are further distilled in the fifth distillation column 5 to remove most of the harmful substances such as methanol, acetaldehyde, propanol, and n-propanol, and a third vapor mixture containing ethyl acetate, ethyl lactate, organic acids, and β-phenylethyl alcohol is obtained. The third vapor mixture is condensed to obtain the finished ethanol solution. In this embodiment, harmful components are removed and beneficial components are obtained through step-by-step distillation, and there is no need for secondary distillation, which can achieve continuous and high-efficiency production of liquor.

[0050] As Figure 1 shown, this embodiment also provides a device for distilling liquid-process liquor, which applies the above-mentioned method for distilling liquid-process liquor. The device for distilling liquid-process liquor includes a first distillation column 1, a second distillation column 2, a third distillation column 3, a fourth distillation column 4, a fifth distillation column 5, a first reboiler 6, a second reboiler 7, a third reboiler 8, a fourth reboiler 9, a fifth reboiler 10, a first condenser 11, a second condenser 12, a third condenser 13, a fourth condenser 14, and a fifth condenser 15. The first reboiler 6, the second reboiler 7, the third reboiler 8, the fourth reboiler 9, and the fifth reboiler 10 are respectively connected to the bottoms of the first distillation column 1, the second distillation column 2, the third distillation column 3, the fourth distillation column 4, and the fifth distillation column 5; the first condenser 11, the second condenser 12, the third condenser 13, the fourth condenser 14, and the fifth condenser 15 are respectively connected to the tops of the first distillation column 1, the second distillation column 2, the third distillation column 3, the fourth distillation column 4, and the fifth distillation column 5; the first condenser 11 is connected to the second reboiler 7, the bottom of the second distillation column 2 is connected to the third reboiler 8, the bottom of the third distillation column 3 is connected to the fourth reboiler 9, the third condenser 13 is connected to the fifth distillation column 5, and the bottom of the fourth distillation column 4 is connected to the fifth reboiler 10.

[0051] The device for fractional distillation of liquid-process white spirit in this embodiment operates under normal pressure. It can not only continuously distill the fermentation broth, improving production efficiency, but more importantly, it can accurately retain beneficial flavor components such as organic acids and β-phenylethyl alcohol, while effectively removing bad flavor components such as methanol, n-propanol, and isobutanol, enhancing the quality of the original liquor and being more beneficial to consumers' health. The realization of normal-pressure and continuous fractional distillation reduces equipment costs, increases the service life of equipment, reduces energy consumption, and improves production efficiency.

[0052] Preferably, in this embodiment, the first reboiler 6, the second reboiler 7, the third reboiler 8, the fourth reboiler 9, and the fifth reboiler 10 are all heated by steam.

[0053] As Figure 1 shown, the device for fractional distillation of liquid-process white spirit further includes a waste liquid tank 16. The bottom of the first distillation column 1 and the bottom of the fifth distillation column 5 are both connected to the waste liquid tank 16 to avoid environmental pollution caused by waste liquid.

[0054] As Figure 1 shown, the device for fractional distillation of liquid-process white spirit further includes a first collection tank 17. The first collection tank 17 is connected to the second condenser 12. The first collection tank 17 is used to collect the steam at the top of the second distillation column 2. The components of this steam are mainly low-boiling harmful components such as methanol and acetaldehyde. After being condensed by the second condenser 12, they enter the first collection tank 17.

[0055] As Figure 1 shown, the device for fractional distillation of liquid-process white spirit further includes a second collection tank 18. The second collection tank 18 is connected to the fourth condenser 14. The second collection tank 18 is used to collect the steam at the top of the fourth distillation column 4. The components of this steam are mainly higher alcohol components such as n-propanol, isobutanol, n-pentanol, and n-butanol. After being condensed by the fourth condenser 14, they enter the second collection tank 18.

[0056] As Figure 1 shown, the device for fractional distillation of liquid-process white spirit further includes a raw material tank 19. The raw material tank 19 is connected to the first reboiler 6 and is used to provide the fermentation broth to the first reboiler 6.

[0057] As Figure 1 shown, the device for fractional distillation of liquid-process white spirit further includes a first material pump, a second material pump, a third material pump, a fourth material pump, and a fifth material pump. Among them, the first material pump is connected between the raw material tank 19 and the first reboiler 6, the second material pump is connected between the first condenser 11 and the second reboiler 7, the third material pump is connected between the bottom of the second distillation column 2 and the third reboiler 8, the fourth material pump is connected between the bottom of the third distillation column 3 and the fourth reboiler 9, and the fifth material pump is connected between the bottom of the fourth distillation column 4 and the fifth reboiler 10.

[0058] AsFigure 1 As shown, the first distillation column 1, the second distillation column 2, the third distillation column 3, the fourth distillation column 4 and the fifth distillation column 5 are connected by sealed pipelines, and a feed inlet is provided at the bottom of each distillation column, and a discharge outlet is provided at the top of each distillation column.

[0059] As Figure 1 shown, the device for distilling white spirit by the liquid method further includes a finished product tank, and the finished product tank is connected to the fifth condenser 15 for collecting the finished product solution.

[0060] The device for distilling white spirit by the liquid method further includes a first discharge valve, a second discharge valve, a third discharge valve, a fourth discharge valve and a fifth discharge valve. The first discharge valve, the second discharge valve, the third discharge valve, the fourth discharge valve and the fifth discharge valve are respectively arranged at the bottom of the first distillation column 1, the second distillation column 2, the third distillation column 3, the fourth distillation column 4 and the fifth distillation column 5. Preferably, the first discharge valve, the second discharge valve, the third discharge valve, the fourth discharge valve and the fifth discharge valve are all pneumatic valves.

[0061] The device for distilling white spirit by the liquid method further includes a first liquid level gauge, a second liquid level gauge, a third liquid level gauge, a fourth liquid level gauge and a fifth liquid level gauge. The first liquid level gauge, the second liquid level gauge, the third liquid level gauge, the fourth liquid level gauge and the fifth liquid level gauge are respectively used to detect the liquid levels at the bottoms of the first distillation column 1, the second distillation column 2, the third distillation column 3, the fourth distillation column 4 and the fifth distillation column 5.

[0062] The device for distilling white spirit by the liquid method further includes a plurality of flow meters and pressure transmitters arranged on the pipeline.

[0063] Preferably, the first distillation column 1, the second distillation column 2, the third distillation column 3, the fourth distillation column 4 and the fifth distillation column 5 are all packed towers, and the internals of the towers adopt structured packing and multi-row orifice distributors.

[0064] The specific working process of the device for distilling white spirit by the liquid method is as follows:

[0065] The fermented liquid enters the first distillation column 1 from the raw material tank 19 by the first material pump. When it is heated to 85 °C by the first reboiler 6, the discharge valve at the top of the first distillation column 1 is opened. After the material is condensed by the first condenser 11, it is sent to the second distillation column 2 through a sealed pipeline. When the liquid level at the bottom of the first distillation column 1 reaches 50%, the first discharge valve at the bottom is opened, and the waste liquid at the bottom is discharged into the waste liquid tank 16.

[0066] At this time, the liquid-phase material in the second rectification column 2 is mainly an ethanol solution of various organic substances, with an alcohol content of about 95°. When it is heated by the second reboiler 7 at the bottom of the column until the top temperature reaches 70°C, the top discharge valve is opened. After the material is condensed by the second condenser 12 at the top of the column, it is sent to the first collection tank 17. Most of the low-boiling harmful components such as methanol and acetaldehyde are removed in this process. When the liquid level at the bottom of the second rectification column 2 reaches 90%, the second bottom discharge valve is opened, and the ethanol solution of various organic substances after most of the methanol and acetaldehyde have been removed enters the third rectification column 3.

[0067] The liquid-phase material is heated by the third reboiler 8 at the bottom of the third rectification column 3. When the top temperature reaches 80°C, the top discharge valve is opened to extract the effective components with boiling points between methanol and n-propanol and a part of the ethanol solution. After being cooled by the third condenser 13, it enters the fifth rectification column 5 through a sealed pipeline for rectification. When the liquid level at the bottom of the third rectification column 3 reaches 90%, the third bottom discharge valve is opened, and the ethanol solution material containing various higher alcohols, ethyl lactate, organic acids, and β-phenylethyl alcohol components enters the fourth rectification column 4.

[0068] The liquid-phase material is heated by the fourth reboiler 9 at the bottom of the fourth rectification column 4. When the top temperature reaches 90°C, the top discharge valve is opened to remove most of the higher alcohol components such as n-propanol, isobutanol, n-pentanol, and n-butanol. When the liquid level at the bottom of the fourth rectification column 4 reaches 90%, the fourth bottom discharge valve is opened, and the ethanol solution mainly composed of ethyl lactate, organic acids, and β-phenylethyl alcohol enters the fifth rectification column 5.

[0069] The above liquid-phase material and the liquid-phase material in the third rectification column 3 are heated by the fifth reboiler 10 at the bottom of the fifth rectification column 5. When the top temperature reaches 85°C, the top discharge valve is opened. After rectification, most of the harmful substances such as methanol and n-propanol are removed. An outlet is provided at the top of the column to obtain the finished ethanol solution containing ethyl acetate, ethyl lactate, organic acids, and β-phenylethyl alcohol, which is collected in the finished product tank. When the liquid level at the bottom of the fifth rectification column 5 reaches 90%, the fifth bottom discharge valve is opened, and the waste liquid containing methanol, acetaldehyde, propanol, n-propanol, etc. is discharged to the waste liquid tank 16.

[0070] In summary, the method and device for distilling white liquor by the liquid method in this embodiment remove harmful components and obtain beneficial components through step-by-step distillation, and do not require secondary distillation, which can achieve continuous and high-efficiency production of liquor.

[0071] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A method for distilling white spirit by liquid method, characterized in that, Including: Step S1: The fermentation broth enters the first rectification column (1). The pressure in the first rectification column (1) is atmospheric pressure. When the temperature at the top of the first rectification column (1) rises to 85°C - 90°C, a first steam mixture is obtained, and the first steam mixture is led out from the top of the first rectification column (1). Step S2: The first steam mixture in Step S1 is condensed and then enters the second rectification column (2). The pressure in the second rectification column (2) is atmospheric pressure. When the temperature at the top of the second rectification column (2) rises to 70°C - 75°C, a first liquid mixture is obtained, and the first liquid mixture is led out from the bottom of the second rectification column (2). Step S3: The first liquid mixture in Step S2 enters the third rectification column (3). The pressure in the third rectification column (3) is atmospheric pressure. When the temperature at the top of the third rectification column (3) rises to 80°C - 85°C, a second steam mixture and a second liquid mixture are obtained. The second steam mixture is led out from the top of the third rectification column (3), and the second liquid mixture is led out from the bottom of the third rectification column (3). Step S4: The second liquid mixture in Step S3 enters the fourth rectification column (4). The pressure in the fourth rectification column (4) is atmospheric pressure. When the temperature at the top of the fourth rectification column (4) rises to 90°C - 95°C, a third liquid mixture is obtained, and the third liquid mixture is led out from the bottom of the fourth rectification column (4). Step S5: The second steam mixture in Step S3 is condensed and then enters the fifth rectification column (5). The third liquid mixture in Step S4 enters the fifth rectification column (5). The pressure in the fifth rectification column (5) is atmospheric pressure. When the temperature at the top of the fifth rectification column (5) rises to 85°C - 90°C, a third steam mixture is obtained, and the third steam mixture is led out from the top of the fifth rectification column (5). Step S6: The third steam mixture is condensed to obtain the finished product solution.

2. The method for distilling white liquor by liquid method according to claim 1, wherein, In Step S1, when the liquid level of the mixed liquid at the bottom of the first rectification column (1) reaches 50%, open the first discharge valve at the bottom of the first rectification column (1) and discharge it into the waste liquid tank (16).

3. The method for distilling white spirit by the liquid method according to claim 1, characterized in that, In Step S2, when the liquid level of the first liquid mixture at the bottom of the second rectification column (2) reaches 90%, open the second discharge valve at the bottom of the second rectification column (2) and enter the third rectification column (3).

4. The method for distilling white spirit by liquid method as claimed in claim 1, wherein In Step S3, when the liquid level of the second liquid mixture at the bottom of the third rectification column (3) reaches 90%, open the third discharge valve at the bottom of the third rectification column (3) and enter the fourth rectification column (4).

5. The method for distilling white spirit by liquid method according to claim 1, characterized in that, In Step S4, when the liquid level of the third liquid mixture at the bottom of the fourth rectification column (4) reaches 90%, open the fourth discharge valve at the bottom of the fourth rectification column (4) and enter the fifth rectification column (5).

6. The method for distilling white spirit by liquid method as described in claim 1, characterized in that, In the step S5, when the liquid level of the mixed liquid at the bottom of the fifth rectification column (5) reaches 90%, open the fifth discharge valve at the bottom of the fifth rectification column (5) and discharge it into the waste liquid tank (16).

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