CN112774443A - Reverse osmosis sugar concentration detoxification reflux system for hydrolysate and application method thereof - Google Patents

Reverse osmosis sugar concentration detoxification reflux system for hydrolysate and application method thereof Download PDF

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Publication number
CN112774443A
CN112774443A CN202110004165.6A CN202110004165A CN112774443A CN 112774443 A CN112774443 A CN 112774443A CN 202110004165 A CN202110004165 A CN 202110004165A CN 112774443 A CN112774443 A CN 112774443A
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reverse osmosis
hydrolysate
detoxification
sugar concentration
storage tank
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陈城汉
祝其丽
谭芙蓉
王彦伟
何明雄
胡国全
代立春
吴波
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Biogas Institute of Ministry of Agriculture
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/08—Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
    • C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
    • C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/12—Bioreactors or fermenters specially adapted for specific uses for producing fuels or solvents
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M33/00—Means for introduction, transport, positioning, extraction, harvesting, peeling or sampling of biological material in or from the apparatus
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M43/00—Combinations of bioreactors or fermenters with other apparatus
    • C12M43/02—Bioreactors or fermenters combined with devices for liquid fuel extraction; Biorefineries
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M45/00—Means for pre-treatment of biological substances
    • C12M45/04—Phase separators; Separation of non fermentable material; Fractionation
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P7/00—Preparation of oxygen-containing organic compounds
    • C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
    • C12P7/04—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
    • C12P7/06—Ethanol, i.e. non-beverage
    • C12P7/08—Ethanol, i.e. non-beverage produced as by-product or from waste or cellulosic material substrate
    • C12P7/10—Ethanol, i.e. non-beverage produced as by-product or from waste or cellulosic material substrate substrate containing cellulosic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2311/00—Details relating to membrane separation process operations and control
    • B01D2311/26—Further operations combined with membrane separation processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2311/00—Details relating to membrane separation process operations and control
    • B01D2311/26—Further operations combined with membrane separation processes
    • B01D2311/2669—Distillation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel

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  • Analytical Chemistry (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Abstract

The invention discloses a hydrolysate reverse osmosis sugar concentration detoxification reflux system and a use method thereof, relating to the technical field of reverse osmosis, and comprising a storage tank, a reverse osmosis device, a fermentation tank and a distillation tower which are sequentially connected into a loop, wherein a reverse osmosis system membrane is arranged in the reverse osmosis device, the reverse osmosis system membrane divides the reverse osmosis device into an inner cavity space and an outer ring space, and the use method of the hydrolysate reverse osmosis sugar concentration detoxification reflux system comprises the following steps: collecting the pretreated hydrolysate; introducing the pretreated hydrolysate into a storage tank, and then introducing into a reverse osmosis device for reverse osmosis to remove residues; concentrating the reverse osmosis hydrolysate into a fermentation tank for fermentation, and distilling by a distillation tower to obtain ethanol; the ethanol flowing out of the first outlet flows back to the storage tank, and the ethanol flowing out of the second outlet is additionally stored; according to the invention, a part of ethanol generated by fermentation of the hydrolysate flows back to the hydrolysate in the storage tank, so that the effective utilization rate of the ethanol is improved, and the production and manufacturing cost is reduced.

Description

Reverse osmosis sugar concentration detoxification reflux system for hydrolysate and application method thereof
Technical Field
The invention relates to a hydrolysate reverse osmosis sugar concentration detoxification reflux system and a use method thereof, and relates to the technical field of reverse osmosis.
Background
The reverse osmosis technology is a membrane separation technology using pressure difference as driving force. Under the natural state, the dilute solution and the concentrated solution with the same volume are respectively arranged at two sides of a container, the middle part of the container is blocked by a semipermeable membrane, a solvent in the dilute solution naturally penetrates through the semipermeable membrane and flows to the concentrated solution side, the liquid level at the concentrated solution side is higher than the liquid level of the dilute solution by a certain height to form a pressure difference, the osmotic equilibrium state is reached, and the pressure difference is osmotic pressure. If a pressure greater than the osmotic pressure is applied to the concentrate side, the solvent in the concentrate will flow toward the dilute solution, in the opposite direction to the original direction of osmosis, a process known as reverse osmosis. Reverse osmosis processes separate solutes from a solvent in solution by the permselectivity of a semi-permeable membrane driven by pressure. The reverse osmosis process is simple, the energy consumption is low, the reverse osmosis process is widely applied to seawater and brackish water desalination and is used for separation and concentration of biochemical and biological agents, and the industrial application prospect is wide.
Cellulosic ethanol, as a renewable and relatively clean biofuel, has important value in solving the energy and pollution problems faced by the current international society. However, in the refining process, the concentration of glucose in the raw material cellulose hydrolysate is low, and the raw material cellulose hydrolysate contains residual substances such as furfural and acetic acid, so that the subsequent ethanol fermentation efficiency is obviously influenced, and the residual substances become limiting factors for ethanol refining and application. Existing reverse osmosis plants are typically a series of tanks containing reverse osmosis membranes.
In conclusion, a hydrolysate reverse osmosis sugar concentration detoxification reflux system capable of effectively utilizing ethanol and improving working efficiency and a using method thereof need to be researched.
Disclosure of Invention
The invention aims to: the hydrolysate reverse osmosis sugar concentration detoxification reflux system adopts a brand-new designed circulating reflux type design, can avoid additional ethanol addition of a stop device, and saves the production cost; by adopting a highly integrated circulating reflux structure and fully utilizing the reflux structure design, the product ethanol is efficiently utilized, and the working efficiency is greatly improved.
In order to achieve the above purpose, the invention adopts the technical scheme that:
a concentrated detoxification reflux system of hydrolysate reverse osmosis sugar comprises a storage tank, a reverse osmosis device, a fermentation tank and a distillation tower which are sequentially connected into a loop.
Further, a reverse osmosis system membrane is arranged in the reverse osmosis device, and the reverse osmosis device is divided into an inner cavity space and an outer ring space by the reverse osmosis system membrane. The reverse osmosis system membrane in the reverse osmosis device is divided into two spaces, after the hydrolysate enters the inner cavity space, the residues pass through the reverse osmosis system membrane from the inner cavity space and enter the outer ring space, and the hydrolysate containing saccharides still enters the inner cavity space and then is introduced into the fermentation tank.
Further, the top of the storage box and the top of the inner cavity space are communicated through a pipeline.
Further, the bottom of the inner cavity space is communicated with the top of the fermentation tank through a pipeline.
Further, the outer ring space is communicated with a waste liquid tank. The waste tank is designed to facilitate the collection of the residue that permeates out of the reverse osmosis process.
Further, a sampler is arranged between the fermentation tank and the distillation tower. The design of the sampler is convenient for operators to monitor the fermentation degree of the fermentation liquor in real time in the operation process.
Furthermore, a water pump is arranged between the distillation tower and the storage tank. The design of the water pump is convenient for introducing the ethanol into the storage tank.
Furthermore, a first outlet and a second outlet are arranged at the top of the distillation tower, and the first outlet is communicated with the storage tank.
Further, the use method of the hydrolysate reverse osmosis sugar concentration detoxification reflux system comprises the following steps:
s1, collecting the pretreated hydrolysate;
s2, introducing the pretreated hydrolysate into a storage tank, and then introducing into a reverse osmosis device for reverse osmosis to remove residues;
s3, concentrating the hydrolysate subjected to reverse osmosis into a fermentation tank for fermentation, and distilling by a distillation tower to obtain ethanol;
s4, the ethanol flowing out of the first outlet flows back to the storage tank, and the ethanol flowing out of the second outlet is separately stored.
Reverse osmosis systems separate the solute from the solvent portion of the solution by the selective permeability of a semi-permeable membrane, increasing or decreasing the concentration of certain components in the liquid solution, i.e., residues of furfural, acetic acid, etc. In the invention, the solute in the liquid solution is furfural or furfural and other components, the solvent is water, and the reverse osmosis system is used for separating the solvent water from the original liquid solution to improve the concentration of the solute, but the original liquid solution usually contains furfural and other components, and the experiment aims at reducing the concentration of furfural. The prior art shows that the furfural in a reverse osmosis system can pass through a reverse osmosis membrane, but the separation effect is poor, the rejection rate of the furfural is high, and under the condition that the structure and the operation parameters of the reverse osmosis system are not changed, the rejection rate of the furfural is reduced by adding ethanol into a reverse osmosis device, so that part of ethanol can be recycled through a reflux design, and the working efficiency is improved.
The invention has the beneficial effects that:
(1) according to the hydrolysate reverse osmosis sugar concentration detoxification reflux system provided by the invention, the ethanol is added into the hydrolysate, so that the removal effect of the reverse osmosis separation process of residues such as furfural and the like can be enhanced, and the rejection rate of residues such as furfural and the like is reduced;
(2) according to the invention, a part of ethanol generated by fermentation of the hydrolysate flows back to the hydrolysate in the storage tank, and a part of ethanol is collected and stored, and the backflow ethanol continuously exerts the effect of enhancing the separation of residues such as furfural and the like in the reverse osmosis step, so that the effective utilization rate of the ethanol is improved, and the production and manufacturing cost is reduced;
(3) the design mode of the integrated circulation reflux can effectively utilize the field space, has higher industrialized integration level, is convenient for monitoring and operation, improves the working efficiency, is particularly suitable for industrial mass production, and obviously improves the production benefit.
Drawings
FIG. 1 is a block diagram of the present invention;
in the figure: 1. a storage tank; 2. a reverse osmosis unit; 3. a fermentation tank; 4. a distillation column; 5. a reverse osmosis system membrane; 6. an inner cavity space; 7. an outer ring space; 8. a waste liquid tank; 9. a sampler; 10. a water pump; 11. a first outlet; 12. a second outlet.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The device parameters of the invention can be set within the numerical range according to actual conditions.
Example 1
As shown in fig. 1, a hydrolysate reverse osmosis sugar concentration detoxification reflux system comprises a storage tank 1, a reverse osmosis device 2, a fermentation tank 3 and a distillation tower 4 which are connected in sequence into a loop; a reverse osmosis system membrane 5 is arranged in the reverse osmosis device 2, and the reverse osmosis system membrane 5 divides the reverse osmosis device 2 into an inner cavity space 6 and an outer ring space 7; the top of the storage box 1 is communicated with the top of the inner cavity space 6 through a pipeline; the bottom of the inner cavity space 6 is communicated with the top of the fermentation tank 3 through a pipeline; the outer ring space 7 is communicated with a waste liquid tank 8; a sampler 9 is also arranged between the fermentation tank 3 and the distillation tower 4; a water pump 10 is also arranged between the distillation tower 4 and the storage tank 1; the top of the distillation tower 4 is provided with a first outlet 11 and a second outlet 12, and the first outlet 11 is communicated with the storage tank 1.
The operating principle of the hydrolysate reverse osmosis sugar concentration detoxification reflux system is as follows: the storage has the maize straw hydrolysate that needs fermentation treatment in bin 1, the mixed maize straw hydrolysate of backward flow ethanol, liquid after the reverse osmosis separation uses the zymomonas mobilis to carry out the ethanol fermentation experiment, the waste liquid case 8 of 2 bottoms of reverse osmosis unit is used for collecting the residue, waste liquid case 8 is connected in reverse osmosis unit 2's outer lane space 7, fermentation cylinder 3 communicates in reverse osmosis unit 2's inner chamber space 6, mixed liquid after the reverse osmosis lets in fermentation cylinder 3 fermentation, the ethanol that produces after the fermentation is through distillation column 4 distillation, part ethanol gets into in bin 1 via first export 11, another part ethanol is collected via second export 12 can.
The use method of the hydrolysate reverse osmosis sugar concentration detoxification reflux system comprises the following steps:
s1, collecting the pretreated hydrolysate;
s2, introducing the pretreated hydrolysate into a storage tank 1, and then introducing into a reverse osmosis device 2 for reverse osmosis to remove residues;
s3, concentrating the hydrolysate subjected to reverse osmosis into a fermentation tank 3 for fermentation, and distilling by a distillation tower 4 to obtain ethanol;
s4, the ethanol flowing out of the first outlet 11 is returned to the storage tank 1, and the ethanol flowing out of the second outlet 12 is separately stored.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. The concentrated detoxification reflux system for the reverse osmosis sugar of the hydrolysate is characterized by comprising a storage tank (1), a reverse osmosis device (2), a fermentation tank (3) and a distillation tower (4) which are sequentially connected into a loop.
2. The hydrolysate reverse osmosis sugar concentration detoxification reflux system according to claim 1, wherein a reverse osmosis system membrane (5) is arranged in the reverse osmosis device (2), and the reverse osmosis system membrane (5) divides the reverse osmosis device (2) into an inner cavity space (6) and an outer ring space (7).
3. The hydrolysate reverse osmosis sugar concentration detoxification reflux system according to claim 2, wherein the top of the storage tank (1) and the top of the inner cavity space (6) are communicated through a pipeline.
4. The hydrolysate reverse osmosis sugar concentration detoxification reflux system according to claim 3, wherein the bottom of the inner cavity space (6) is communicated with the top of the fermentation tank (3) through a pipeline.
5. The hydrolysate reverse osmosis sugar concentration detoxification reflux system according to claim 4, wherein the outer ring space (7) is communicated with a waste liquid tank (8).
6. The hydrolysate reverse osmosis sugar concentration detoxification reflux system according to claim 5, wherein a sampler (9) is further arranged between the fermentation tank (3) and the distillation tower (4).
7. The hydrolysate reverse osmosis sugar concentration detoxification reflux system according to claim 6, wherein a water pump (10) is further arranged between the distillation tower (4) and the storage tank (1).
8. The hydrolysate reverse osmosis sugar concentration detoxification reflux system according to claim 7, wherein a first outlet (11) and a second outlet (12) are arranged at the top of the distillation tower (4), and the first outlet (11) is communicated with the storage tank (1).
9. The use method of the hydrolysate reverse osmosis sugar concentration detoxification reflux system according to claim 8, comprising the following steps:
s1, collecting the pretreated hydrolysate;
s2, introducing the pretreated hydrolysate into a storage tank (1), and then introducing into a reverse osmosis device (2) for reverse osmosis to remove residues;
s3, collecting the hydrolysate subjected to reverse osmosis into a fermentation tank (3) for fermentation, and distilling the hydrolysate through a distillation tower (4) to obtain ethanol;
s4, the ethanol flowing out of the first outlet (11) flows back to the storage tank (1), and the ethanol flowing out of the second outlet (12) is separately stored.
CN202110004165.6A 2021-01-04 2021-01-04 Reverse osmosis sugar concentration detoxification reflux system for hydrolysate and application method thereof Pending CN112774443A (en)

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55147108A (en) * 1979-05-08 1980-11-15 Asahi Chem Ind Co Ltd Treatment of polysulfone semipermeable membrane
US4822737A (en) * 1983-10-21 1989-04-18 Research Association For Petroleum Alternatives Development Process for producing ethanol by fermentation
US20070199894A1 (en) * 2005-05-12 2007-08-30 Peyton Thomas O By-products from fermentation still bottoms
CN101413017A (en) * 2008-12-03 2009-04-22 北京林业大学 Method for preparing absolute ethyl alcohol from furfural residue
US20110195468A1 (en) * 2009-05-05 2011-08-11 American Process, Inc. system and process for separating pure chemicals from biomass extract
CN102639722A (en) * 2008-12-09 2012-08-15 东丽株式会社 Method for producing sugar liquid
US8252350B1 (en) * 2008-11-24 2012-08-28 Cadwalader Robert E Ethanol recovery from fermentation broth
CN102659257A (en) * 2012-05-14 2012-09-12 广西师范大学 Technology for treating white gourd juice wastewater and preparing ethanol by fermentation
US20160160242A1 (en) * 2013-07-12 2016-06-09 Toray Industries, Inc. Method of producing alcohol from cellulose-containing biomass
CN108939951A (en) * 2018-07-26 2018-12-07 浙江工业大学 A kind of self-assembled modified polyamide reverse osmosis composite film and its application
CN112007515A (en) * 2019-05-29 2020-12-01 农业部沼气科学研究所 Method for reducing reverse osmosis separation rejection rate of furan formaldehyde

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55147108A (en) * 1979-05-08 1980-11-15 Asahi Chem Ind Co Ltd Treatment of polysulfone semipermeable membrane
US4822737A (en) * 1983-10-21 1989-04-18 Research Association For Petroleum Alternatives Development Process for producing ethanol by fermentation
US20070199894A1 (en) * 2005-05-12 2007-08-30 Peyton Thomas O By-products from fermentation still bottoms
US8252350B1 (en) * 2008-11-24 2012-08-28 Cadwalader Robert E Ethanol recovery from fermentation broth
CN101413017A (en) * 2008-12-03 2009-04-22 北京林业大学 Method for preparing absolute ethyl alcohol from furfural residue
CN102639722A (en) * 2008-12-09 2012-08-15 东丽株式会社 Method for producing sugar liquid
US20110195468A1 (en) * 2009-05-05 2011-08-11 American Process, Inc. system and process for separating pure chemicals from biomass extract
CN102659257A (en) * 2012-05-14 2012-09-12 广西师范大学 Technology for treating white gourd juice wastewater and preparing ethanol by fermentation
US20160160242A1 (en) * 2013-07-12 2016-06-09 Toray Industries, Inc. Method of producing alcohol from cellulose-containing biomass
CN108939951A (en) * 2018-07-26 2018-12-07 浙江工业大学 A kind of self-assembled modified polyamide reverse osmosis composite film and its application
CN112007515A (en) * 2019-05-29 2020-12-01 农业部沼气科学研究所 Method for reducing reverse osmosis separation rejection rate of furan formaldehyde

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Application publication date: 20210511