A bdo concentration system

Abstract

The application discloses a BDO concentration system, which comprises a thick mash tower, a clear mash tower, a rectifying tower and a membrane assembly mechanism, wherein the thick mash tower and the rectifying tower are connected, the clear mash tower and the rectifying tower are connected, and the rectifying tower and the membrane assembly mechanism are connected. Part of mash liquid with high strain concentration is transported to the thick mash tower, and part of clear liquid with low strain concentration is transported to the clear mash tower. The thick mash tower works under negative pressure, the clear mash tower works under normal pressure, the rectifying tower works under pressure, and the membrane assembly works under low pressure. The BDO is concentrated by combining the thick mash tower, the clear mash tower, the crude wine tank and the membrane assembly mechanism in sequence, and the traditional distillation is organically combined with the inorganic membrane, so that the problem of BDO concentration difficulty in the existing production process is solved, the by-product BDO has good concentration effect and is easy to decompose, and the application can greatly meet the demand of the daily chemical industry on BDO.

Description

Technical Field

[0001] This invention relates to the field of BDO concentration system technology, and more particularly to a BDO concentration system for the process of separating and concentrating BDO in the production of fuel ethanol from ferroalloy industrial tail gas fermentation. Background Technology

[0002] In the field of ferroalloy industrial tail gas fermentation for fuel ethanol production, two solutions are generated during the process: one is a clear liquid filtered through a fermentation ceramic membrane, and the other is a mash filtered through a fermentation ceramic membrane. Currently, the distillation system mainly extracts ethanol and protein powder from these two liquids by distillation. Ethanol is produced through a concentrated mash tower, a clear mash tower A, a clear mash tower B, and a rectification tower. After the concentrated mash is distilled into crude alcohol in the concentrated mash tower, the bottom liquid is sent to the protein centrifuge for separation and spray drying to produce protein powder. The byproduct BDO has poor concentration and is difficult to decompose, causing serious impacts on downstream wastewater. However, BDO has better economic benefits and is mainly used in cosmetics for its moisturizing effect. In recent years, with the rise of the daily chemical industry, the demand for BDO in this industry has been large. The application of this invention can greatly meet the demand for BDO in the daily chemical industry. Summary of the Invention

[0003] The main objective of this invention is to provide a BDO concentration system that addresses the technical problems of existing technologies, such as "poor concentration of byproduct BDO, difficulty in decomposition, and serious impact on downstream wastewater."

[0004] To achieve the above objectives, this invention proposes a BDO concentration system, comprising a concentrated mash tower, a clarified mash tower, a distillation tower, and a membrane module assembly. The concentrated mash tower and the distillation tower are connected, the clarified mash tower and the distillation tower are connected, and the distillation tower and the membrane module assembly are connected. A portion of the mash with a high bacterial concentration is transported to the concentrated mash tower, and another portion of the clarified mash with a low bacterial concentration is transported to the clarified mash tower. The concentrated mash tower operates under negative pressure, the clarified mash tower operates under normal pressure, the distillation tower operates under pressure, and the membrane module operates under low pressure.

[0005] The concentrated mash tower separates crude alcohol from the bacterial protein solution in the concentrated mash. The crude alcohol is sent to a distillation tower to separate BDO from ethanol. The bacterial protein solution is sent to the protein processing section for centrifugation. The supernatant absorbs water through a membrane module, and the lower layer of bacterial protein solution is used to produce protein powder.

[0006] The clear mash tower separates the crude alcohol from the lees solution in the clear mash liquid. The lees solution is sent to the fermentation reuse, while the crude alcohol is sent to the distillation tower to separate BDO from the alcohols.

[0007] The distillation column further separates the crude alcohol distilled from the concentrated mash column and the clear mash column from the supernatant after centrifugation. The alcohol vapor is sent from the top to the alcohol storage tank, and the bottom liquid BDO contains a small amount of water.

[0008] The membrane module mechanism is the process of passing the BDO liquid from the bottom of the distillation column and the protein centrifuged liquid through the membrane module to absorb water and obtain the finished BDO product.

[0009] Optionally, the concentrated mash tower is connected to the main mash pipe of the upstream fermentation section and to the downstream protein processing section, while the clear mash tower is connected to the main clear liquid pipe of the upstream fermentation section.

[0010] Optionally, the concentration of microbial strains in the feed mash of the concentrated mash tower is ≥20g / L, and the concentration of microbial strains in the feed clear mash of the clear mash tower is ≤2g / L.

[0011] Optionally, the mash tower consists of 22 1.8m tower plates and 10 1m tower plates. The mash is fed from the 22 plates, the light components rise and are distilled off from the top of the tower, and the heavy components flow downward and are discharged from the bottom of the mash tower.

[0012] Optionally, the clear mash tower consists of 22 2.2m tower plates and 4m 350Y tower plates. The clear liquid is fed from the 2.2m tower plate, the light components move upward and are distilled out from the top of the tower, and the heavy components move downward and are discharged from the clear mash tower bottom.

[0013] Optionally, the distillation column consists of 72 2m trays. The crude liquor is fed from tray 21, and the light components such as alcohol vapor rise and are distilled off from the top of the column, while the heavy component BDO flows downward and is discharged from the bottom of the distillation column. The finished product BDO is obtained through a membrane module mechanism.

[0014] Optionally, the membrane module assembly comprises a feed evaporator, a preheater, a membrane module, a permeate condenser, a vacuum condensation system, and a finished product condenser, wherein the vacuum condensation system includes a vacuum unit and a vacuum buffer tank.

[0015] Optionally, the membrane module uses molecular sieves as the membrane layer material.

[0016] Optionally, during the inorganic membrane dehydration process in the membrane module, the aqueous BDO is preheated before entering the feed side of the membrane module, while the permeate side is maintained in a low-pressure environment with an absolute pressure of less than 2000 Pa by vacuuming.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This BDO concentration system has a simple and reasonable structural design. By setting up a concentrated mash tower, a clear mash tower, a crude wine tank and a membrane module in sequence, it organically combines traditional distillation with inorganic membranes to concentrate BDO, which solves the problem of difficult BDO concentration in the existing production process. It can make the by-product BDO have a good concentration effect and be easy to decompose. The application of the present invention can greatly meet the demand for BDO in the daily chemical industry. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram illustrating the detailed operation process of the present invention.

[0021] In the diagram: 1. Concentrated mash tower, 2. Clear mash tower, 3. Crude liquor tank, 4. Distillation tower, 5. Preheater, 6. Evaporator, 7. Membrane module, 8. Finished product condenser, 9. Permeate condenser, 10. Vacuum unit, 11. Vacuum buffer tank. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0026] Example:

[0027] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 2 For a detailed flowchart of the operation of this invention, please refer to [link / reference]. Figure 1-2 This invention provides a technical solution: a BDO concentration system, comprising a mash concentration tower 1, a clear mash tower 2, a distillation tower 4, and a membrane module assembly, wherein the mash concentration tower 1 and the distillation tower 4 are connected, the clear mash tower 2 and the distillation tower 4 are connected, and the distillation tower 4 and the membrane module assembly are connected. A portion of the mash with a high bacterial concentration is transported to the mash concentration tower 1, and another portion of the clear mash with a low bacterial concentration is transported to the clear mash tower 2. The mash concentration tower operates under negative pressure, the clear mash tower operates under normal pressure, the distillation tower operates under pressure, and the membrane module operates under low pressure.

[0028] The concentrated mash tower separates crude alcohol from the microbial protein solution in the concentrated mash. The crude alcohol is sent to the distillation tower 4 to separate BDO from ethanol. The microbial protein solution is sent to the protein processing section for centrifugation. After centrifugation, the supernatant absorbs water through a membrane module, and the lower layer of microbial protein solution is used to produce protein powder. The fermentation mash is preheated to about 50°C by the concentrated mash preheater via a flow meter and then pumped to the concentrated mash tower 1 by the feed pump. Crude alcohol gas at 65°C is discharged from the stripping section above the concentrated mash tower 1. After condensation, the crude alcohol gas is pumped to the crude wine tank 3 by the concentrated mash tower pump.

[0029] The clear mash tower 2 separates the crude alcohol from the lees solution in the clear mash liquid. The lees solution is sent to the fermentation reuse, while the crude alcohol is sent to the distillation tower 4 to separate BDO from alcohols. The fermentation liquid is pumped to the clear mash tower 2 by the feed pump. The crude ethanol generated by the condensation of alcohol vapor at the top of the clear mash tower 2 is sent to the crude liquor tank 3, and the bottom liquid is sent to the lees clarification tank for fermentation reuse. The crude liquor from the crude liquor tank 3 is pumped from the 21st tray of the tower to the distillation tower 4.

[0030] The distillation column 4 further separates the crude alcohol distilled from the concentrated mash column and the clear mash column, as well as the supernatant after centrifugation. The alcohol vapor is sent from the top to the alcohol storage tank, and the bottom liquid of the column contains a small amount of water (BDO). After the alcohol vapor at the top of the distillation column 4 is condensed, it is adsorbed and dehydrated by a molecular sieve adsorption column in an adsorption state and then sent to the finished ethanol storage tank. The bottom liquid containing BDO is discharged from the bottom of the distillation column 4. The protein centrifuged clear liquid is sent to the membrane module preheater 5 for heating through the BDO feed pump, and then enters the membrane module evaporator 6 for vaporization before being sent to the inorganic membrane feed side. After separation, the concentrated BDO product is obtained at the membrane feed side outlet. The BDO product enters the membrane module preheater 5 for heat exchange through the inorganic membrane product outlet, and is then condensed and collected by the product condenser.

[0031] The membrane module mechanism is the process of passing the BDO bottom liquid from the distillation column and the protein centrifuged liquid through the membrane module to absorb water and obtain the finished BDO product.

[0032] Fermentation mash is pumped to the concentration tower 1 by a feed pump. The vapor from the top of the concentration tower 1 condenses to produce crude ethanol, which is sent to the crude liquor tank 3. The bottom liquid is sent to the protein processing section for centrifugation, and the supernatant is sent to the membrane module 7. The centrifuged microbial protein is dried to produce protein powder. The clarified fermentation broth is pumped to the clarifying tower 2 by a feed pump. The vapor from the top of the clarifying tower 2 condenses to produce crude ethanol, which is sent to the crude liquor tank 3. The bottom liquid is sent to the clarification tank for reuse in fermentation. The crude liquor from the crude liquor tank 3 is pumped from the 21st tray of the tower. The feed is fed into distillation column 4. The vapors at the top of column 4 are condensed and then adsorbed and dehydrated by a molecular sieve adsorption column before being sent to the finished ethanol storage tank. The bottom liquid containing BDO is discharged from the bottom of distillation column 4. The BDO-containing supernatant, along with the protein centrifuged supernatant, is pumped to membrane module preheater 5 for heating, then enters membrane module evaporator 6 for vaporization before being sent to the inorganic membrane feed side. The permeate side is maintained at a low pressure (absolute pressure below 2000 Pa) using a vacuum method. On the feed side, water molecules preferentially adsorb onto the membrane surface and permeate under the pressure difference of water vapor across the membrane, vaporizing as water vapor on the permeate side. After separation, concentrated BDO is obtained at the membrane feed side outlet. The BDO product enters membrane module preheater 5 through the inorganic membrane product outlet for heat exchange, and is then condensed and collected by the product condenser. The permeate side components are condensed and sent to wastewater treatment.

[0033] By setting up a concentrated mash tower 1, a clear mash tower 2, a crude liquor tank 3, and a membrane module mechanism in sequence, traditional distillation is organically combined with inorganic membranes to concentrate BDO, which solves the problem of difficult BDO concentration in the existing production process. It can make the by-product BDO have a good concentration effect and be easy to decompose. The application of this invention can greatly meet the demand for BDO in the daily chemical industry.

[0034] Optionally, the concentrated mash tower 1 is connected to the main mash pipe of the upstream fermentation section and to the downstream protein processing section, and the clear mash tower 2 is connected to the main clear liquid pipe of the upstream fermentation section.

[0035] Optionally, the concentration of microbial strains in the feed mash of the concentrated mash tower 1 is ≥20g / L, and the concentration of microbial strains in the feed clear mash of the clear mash tower 2 is ≤2g / L.

[0036] Optionally, the concentrated mash tower 1 consists of 22 tower plates of 1.8m and 10 tower plates of 1m. The mash is fed from the 22 plates, the light components move upward and are distilled out from the top of the tower, and the heavy components move downward and are discharged from the concentrated mash tower kettle.

[0037] Optionally, the clear mash tower 2 consists of 22 2.2m tower plates and 4m 350Y tower plates. The clear liquid is fed from the 2.2m plate, the light components move upward and are distilled out from the top of the tower, and the heavy components move downward and are discharged from the clear mash tower kettle.

[0038] Optionally, the distillation column 4 consists of 72 2m trays. The crude liquor is fed from tray 21. Light components such as alcohol vapor rise and are distilled off from the top of the column, while the heavy component BDO flows downward and is discharged from the bottom of the distillation column. The finished product BDO is obtained through the membrane module mechanism.

[0039] Optionally, the membrane module assembly comprises a feed evaporator 6, a preheater 5, a membrane module 7, a permeate condenser 9, a vacuum condensation system, and a finished product condenser 8. The vacuum condensation system includes a vacuum unit 10 and a vacuum buffer tank 11. Downstream of the membrane, the condensed permeate (mainly water) is recovered using a vacuum and condensation method, and the BDO is gradually dehydrated through the series of membrane modules.

[0040] Optionally, the membrane module 7 uses a molecular sieve as the membrane layer material. Using a molecular sieve as the membrane layer material (core separation membrane layer) utilizes its regular pores to achieve separation of different components based on molecular size. The inorganic membrane is formed by growing A-type molecular sieve crystals on a tubular ceramic porous support to form a tightly packed membrane layer with a pore size of approximately 4.1 Å, which is larger than the kinetic diameter of water molecules (~2.9 Å) but smaller than the molecular diameter of most organic solvents, exhibiting good shape selectivity for water molecules. Furthermore, the silicon-aluminum content (Si / Al = 1) in the molecular sieve framework gives it extremely strong hydrophilicity, making the inorganic membrane particularly suitable for dehydration of organic solvents.

[0041] Optionally, during the inorganic membrane dehydration process in the membrane module 7, the aqueous BDO is preheated before entering the feed side of the membrane module, while the permeate side is maintained at a low pressure environment of less than 2000 Pa using a vacuum method. On the feed side of the membrane module 7, water molecules preferentially adsorb onto the membrane surface and permeate through the membrane under the pressure difference of water vapor on both sides, vaporizing into water vapor on the permeate side. After separation, concentrated BDO is obtained at the membrane feed side outlet. The BDO product enters the membrane module preheater 5 through the inorganic membrane product outlet for heat exchange, and is then condensed and collected by the product condenser. The permeate side components are condensed and sent to wastewater treatment.

[0042] In this BDO concentration system, the fermentation mash is first preheated to about 50°C by a flow meter in a mash preheater and then pumped to mash tower 1 by a feed pump. Crude alcohol gas at 65°C is discharged from the stripping section of mash tower 1. After condensation, the crude alcohol gas is pumped to crude liquor tank 3 by a mash tower pump. The bottom liquid is sent to the protein processing section, centrifuged by a centrifuge, and the supernatant is sent to the membrane module. The centrifuged bacterial protein is used to produce protein powder.

[0043] After the fermentation liquid is preheated to about 90°C by the preheater of the mash tower, it is sent to the upper feed plate of the mash tower 2 by the feed pump of the mash tower. There is a remote flow meter between the feed pump of the mash tower and the mash tower 2. The feed rate is determined by this remote flow meter. Part of the crude ethanol produced by the condensation of alcohol vapor at the top of the mash tower 2 is returned to the top of the tower by the reflux flow meter, and most of it is sent to the crude wine tank 3 by the delivery flow meter. The bottom liquid of the tower is sent to the lees clarification tank for fermentation reuse.

[0044] The crude liquor from crude liquor tank 3 is preheated by a crude liquor pump and fed into distillation column 4 via a crude ethanol preheater after passing through a 21-layer tray. The crude liquor tank is equipped with a level control system and an automatic valve to interlock and control the liquid level. Distillation column 4 is equipped with a level controller and an automatic valve to maintain the stability of the bottom distillate. The alcohol vapor at the top of distillation column 4, with a concentration greater than 95.5% (v / v), is heated by a heater and then passes through a molecular sieve adsorption tower in an adsorption state for dehydration. The dehydrated ethanol vapor is condensed and enters the ethanol storage tank. The bottom liquid containing BDO and the protein centrifuged clear liquid are pumped to preheater 5 to 40°C and then to evaporator 6 to evaporate to 120°C. The vapor is then fed into membrane module 7, where it is vaporized and sent to the inorganic membrane feed side. The permeate side is maintained at a low pressure (absolute pressure below 2000 Pa) using a vacuum system. On the feed side, water molecules preferentially adsorb onto the membrane surface and permeate through the membrane under the pressure difference of water vapor on both sides, vaporizing into water vapor on the permeate side. After separation, concentrated BDO product is obtained at the membrane feed side outlet. The BDO product enters the membrane module preheater 5 for heat exchange through the inorganic membrane product outlet, and is then condensed and collected by the product condenser 8. Meanwhile, the water vapor on the permeate side is cooled and sent to wastewater treatment via the vacuum buffer tank 11.

[0045] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A BDO concentration system, comprising a mash concentration tower (1), a clear mash tower (2), a distillation tower (4), and a membrane module assembly, characterized in that: The concentrated mash tower (1) is connected to the distillation tower (4), the clear mash tower (2) is connected to the distillation tower (4), and the distillation tower (4) is connected to the membrane module. A portion of the mash with high bacterial concentration is transported to the concentrated mash tower (1), and another portion of the clear mash with low bacterial concentration is transported to the clear mash tower (2). The concentrated mash tower operates under negative pressure, the clear mash tower operates under normal pressure, the distillation tower operates under pressure, and the membrane module operates under low pressure. The concentrated mash tower separates crude alcohol from bacterial protein solution in concentrated mash. The crude alcohol is sent to distillation tower (4) to separate BDO from ethanol. The bacterial protein solution is sent to protein processing section for centrifugation. After centrifugation, the supernatant absorbs water through membrane module, and the lower layer of bacterial protein solution is used to produce protein powder. The clear mash tower (2) separates the crude alcohol and the lees solution in the clear mash liquid. The lees solution is sent to the fermentation reuse, and the crude alcohol is sent to the distillation tower (4) to separate BDO from alcohols. The distillation column (4) further separates the crude alcohol distilled from the concentrated mash column and the clear mash column and the supernatant after centrifugation. The alcohol vapor is sent from the top to the alcohol storage tank, and the bottom liquid BDO contains a small amount of water. The membrane module mechanism is the process of passing the BDO bottom liquid from the distillation column and the protein centrifugation liquid through the membrane module to absorb water and obtain the finished BDO product. The concentrated mash tower (1) is connected to the main mash pipe of the upstream fermentation section and to the downstream protein section, while the clear mash tower (2) is connected to the main clear liquid pipe of the upstream fermentation section. The concentration of bacteria in the feed mash of the concentrated mash tower (1) is ≥20g / L, and the concentration of bacteria in the feed clear mash of the clear mash tower (2) is ≤2g / L. The concentrated mash tower (1) consists of 22 tower plates of 1.8m and 10 tower plates of 1m. The mash is fed from the 22 plates. The light components move upward and are distilled out from the top of the tower, while the heavy components move downward and are discharged from the bottom of the concentrated mash tower. The clear mash tower (2) consists of 22 tower plates of 2.2m and 4m 350Y tower plates. The clear liquid is fed from the 2.2m plate. The light components move upward and are distilled out from the top of the tower, while the heavy components move downward and are discharged from the bottom of the clear mash tower. The distillation column (4) consists of 72 2m trays. The crude liquor is fed from tray 21. The light components move upward and are distilled from the top of the column, while the heavy components BDO move downward and are discharged from the bottom of the distillation column. The finished product BDO is obtained through the membrane module mechanism. The membrane module consists of a raw material evaporator (6), a preheater (5), a membrane module (7), a permeate condenser (9), a vacuum condensation system, and a finished product condenser (8). The vacuum condensation system includes a vacuum unit (10) and a vacuum buffer tank (11). The membrane module (7) uses molecular sieves as the membrane layer material; During the inorganic membrane dehydration process in the membrane module (7), the aqueous BDO is preheated and then enters the feed side of the membrane module, while the permeate side is maintained in a low-pressure environment with an absolute pressure of less than 2000 Pa by vacuuming.

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