A wastewater treatment and ethanol recovery system suitable for methanol production from biomass

Abstract

The utility model relates to a kind of wastewater treatment and ethanol recovery system suitable for biomass methanol, including stock solution pool, evaporation concentration component, permeation gasification membrane, ethanol recovery component and water component recovery component;The evaporation concentration component is set in the output end of stock solution pool;The permeation gasification membrane is correspondingly set in one end of evaporation concentration component;The ethanol recovery component and water component recovery component are respectively set in both ends of permeation gasification membrane;The other end of evaporation concentration component is connected with water component recovery component.The utility model is by separately pretreating PI (polyimide) monomer wastewater, concentrated solution is separately handled as dangerous waste, ethanol obtained by evaporation is recycled, can be realized while handling wastewater simultaneously giving consideration to resource recovery.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment and ethanol recovery system suitable for biomass-to-methanol production. Background Technology

[0002] Using biomass as raw material, produce green alcohol-based fuels with no carbon footprint for use in ship and vehicle transportation.

[0003] Currently, technologies such as renewable resource gasification, CO / H2 separation, one-carbon chemistry, hydrogenation, and gas-phase carbonylation for producing green electrolyte solvents both domestically and internationally utilize biomass and pre-treated municipal waste or industrial waste as raw materials. These technologies produce high-end and in-demand chemical products such as PI (polyimide) and green alcohol-based fuels through gasification. The production process generates large amounts of high-concentration organic wastewater and wastewater from the circulating water station. While these can be treated and reused, there is currently a technological gap regarding wastewater treatment in biomass-to-methanol production, necessitating an effective treatment solution. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a wastewater treatment and ethanol recovery system suitable for biomass-to-methanol production. By pretreating PI (polyimide) monomer wastewater separately, treating the concentrate as hazardous waste separately, and recovering and reusing the ethanol obtained from evaporation, the system achieves both wastewater treatment and resource recovery.

[0005] The technical solution adopted in this utility model is as follows: The present invention proposes a wastewater treatment and ethanol recovery system suitable for biomass-to-methanol production, comprising a raw liquid tank, an evaporation and concentration component, a pervaporation membrane, an ethanol recovery component, and a water component recovery component; the evaporation and concentration component is located at the output end of the raw liquid tank; the pervaporation membrane is correspondingly located at one end of the evaporation and concentration component; the ethanol recovery component and the water component recovery component are respectively located at both ends of the pervaporation membrane; the other end of the evaporation and concentration component is connected to the water component recovery component.

[0006] Furthermore, the evaporation and concentration assembly includes an evaporator, a concentrate tank, and a crystallizer; the input end of the evaporator is connected to the output end of the raw liquid tank, and one of its output ends is connected to the pervaporation membrane, while the other output end is connected to the input end of the concentrate tank; the input end of the crystallizer is connected to the output end of the concentrate tank.

[0007] Furthermore, one output end of the crystallizer is connected to a vessel residue container.

[0008] Furthermore, the ethanol recovery assembly includes an ethanol condenser and an ethanol storage tank; the input end of the ethanol condenser is connected to one end of the pervaporation membrane; and the input end of the ethanol storage tank is connected to the output end of the ethanol condenser.

[0009] Furthermore, the water component recovery assembly includes a water component condenser and a process water storage tank; the input end of the water component condenser is connected to the other end of the pervaporation membrane; the input end of the process water storage tank is connected to the output end of the water component condenser; and one end of the water component condenser is connected to a crystallizer.

[0010] Furthermore, the operating temperature of the evaporator is 70-80℃.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. Pervaporation membranes utilize a dual mechanism of adsorption-diffusion of components by the membrane layer and molecular sieving. When separating water from organic solvents, hydrophilic membranes are selected as the membrane material, allowing water to pass through preferentially for removal. Ethanol recovery rates can reach over 97%.

[0012] 2. Membrane concentration is performed using waste heat, without incurring additional steam operating costs; 3. Compared with traditional processes, it saves approximately 60% of floor space; 4. It is environmentally friendly, requiring no other organic solvents and avoiding secondary pollution to the environment; 5. The process is simple, highly automated, and safe to operate; 6. Wastewater treatment should be combined with resource recovery. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a wastewater treatment and ethanol recovery system for biomass-to-methanol production proposed in this utility model.

[0014] In the attached diagram, the following labels are used: 1-Potential liquid tank; 2-Pervaporation membrane; 3-Evaporator; 4-Concentrate tank; 5-Crystallizer; 6-Residue tank; 7-Ethanol condenser; 8-Ethanol storage tank; 9-Water component condenser; 10-Process water storage tank. Detailed Implementation

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] It should be noted that in the description of this utility model, the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0017] See appendix Figure 1 The present invention proposes a wastewater treatment and ethanol recovery system suitable for biomass-to-methanol production, comprising a raw liquid tank 1, an evaporation and concentration component, a pervaporation membrane 2, an ethanol recovery component, and a water component recovery component.

[0018] The evaporation and concentration component is connected to the output end of the raw liquid tank 1; the pervaporation membrane 2 is connected to one side of the output end of the evaporation and concentration component; the ethanol recovery component and the water component recovery component are respectively connected to the two ends of the pervaporation membrane 2; and the other side of the output end of the evaporation and concentration component is connected to the water component recovery component.

[0019] Specifically, the evaporation and concentration assembly includes an evaporator 3, a concentrate tank 4, and a crystallizer 5. The input end of the evaporator 3 is connected to the output end of the raw liquid tank 1, and one of its output ends is connected to the input end of the permeation membrane 2, while its bottom output end is connected to the input end of the concentrate tank 4. The input end of the crystallizer 5 is connected to the output end of the concentrate tank 4. In this embodiment, the bottom output end of the crystallizer 5 is also connected to a residue tank 6.

[0020] The ethanol recovery assembly includes an ethanol condenser 7 and an ethanol storage tank 8; the input end of the ethanol condenser 7 is connected to one end of the pervaporation membrane 2; the input end of the ethanol storage tank 8 is connected to the output end of the ethanol condenser.

[0021] The water component recovery assembly includes a water component condenser 9 and a process water storage tank 10; one input end of the water component condenser 9 is connected to the other end of the pervaporation membrane 2; the input end of the process water storage tank 10 is connected to the output end of the water component condenser 9; and the other input end of the water component condenser 9 is connected to the output end of one side of the crystallizer 5.

[0022] The PI monomer wastewater is first collected and then enters the raw liquid tank 1. After being pumped, it enters the evaporator 3. The evaporator 3 operates at low pressure and the temperature is maintained at 70-80℃. The steam condensate enters the pervaporation membrane 2 for separation of water and ethanol components. The separated ethanol is condensed by the ethanol condenser 7 and then enters the ethanol storage tank 8 for collection and later use. The separated water is condensed by the water component condenser 9 and then enters the process water storage tank 10 for collection and reuse as process water in the biochemical system. The concentrated liquid after evaporation by the evaporator 3 is collected by the concentrated liquid tank and then further concentrated by the crystallizer 5 and stored in the reactor residue tank 6 for outsourced treatment. The distilled water produced by the crystallizer 5 is condensed by the water component condenser 9 and also recycled as process water to the process water storage tank 10.

[0023] PI (polyimide) monomer wastewater is a high-concentration organic wastewater with high salt, high COD, and high biotoxicity, with a COD reaching hundreds of thousands. It contains organic solvents such as DMF (N,N-dimethylformamide), DMAC (N,N-dimethylacetamide), and p-chloronitrobenzene, as well as 2-3% salt and ethanol. Pretreatment is necessary before it enters the biological treatment system. Given the relatively small volume of PI monomer wastewater and the significant difference in boiling points between ethanol and DMF, DMAC, and p-chloronitrobenzene, evaporation technology is used for concentration. Operating at 70-80℃ under low-pressure conditions, ethanol and water are separated from the original solution, while DMF, DMAC, p-chloronitrobenzene, and salt remain in the concentrated solution. The wastewater concentration is approximately 8-10 times. The concentrated solution is disposed of as hazardous waste through an external disposal agency. The ethanol and water mixture is treated using pervaporation membrane technology to separate the water and purify the ethanol solution.

[0024] Matters not covered in this utility model are common knowledge.

[0025] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A wastewater treatment and ethanol recovery system suitable for biomass-to-methanol production, characterized in that: The system includes a raw liquid tank, an evaporation and concentration component, a pervaporation membrane, an ethanol recovery component, and a water component recovery component; the evaporation and concentration component is located at the output end of the raw liquid tank; the pervaporation membrane is located at one end of the evaporation and concentration component; the ethanol recovery component and the water component recovery component are located at opposite ends of the pervaporation membrane; the other end of the evaporation and concentration component is connected to the water component recovery component.

2. A system for wastewater treatment and ethanol recovery suitable for methanol production from biomass according to claim 1, characterized in that: The evaporation and concentration assembly includes an evaporator, a concentrate tank, and a crystallizer; the input end of the evaporator is connected to the output end of the raw liquid tank, and one of its output ends is connected to a pervaporation membrane, while the other output end is connected to the input end of the concentrate tank; the input end of the crystallizer is connected to the output end of the concentrate tank.

3. A wastewater treatment and ethanol recovery system suitable for use in the production of methanol from biomass according to claim 2, characterized in that: One output end of the crystallizer is connected to a vessel residue container.

4. The system for wastewater treatment and ethanol recovery suitable for methanol production from biomass according to claim 2, wherein: The ethanol recovery assembly includes an ethanol condenser and an ethanol storage tank; the input end of the ethanol condenser is connected to one end of the pervaporation membrane; the input end of the ethanol storage tank is connected to the output end of the ethanol condenser.

5. The system for wastewater treatment and ethanol recovery suitable for methanol production from biomass according to claim 2, wherein: The water component recovery assembly includes a water component condenser and a process water storage tank; The input end of the water component condenser is connected to the other end of the pervaporation membrane; the input end of the process water storage tank is connected to the output end of the water component condenser; one end of the water component condenser is connected to the crystallizer.

6. The system for wastewater treatment and ethanol recovery suitable for methanol production from biomass according to claim 2, wherein: The operating temperature of the evaporator is 70-80℃.

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