CN109354106B - Recovery processing method of waste liquor of artificial leather production - Google Patents
Recovery processing method of waste liquor of artificial leather production Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/265—Synthetic macromolecular compounds modified or post-treated polymers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
- C02F2101/322—Volatile compounds, e.g. benzene
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
- C02F2103/24—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof from tanneries
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Abstract
The invention relates to the technical field of novel functional materials, and discloses a method for recycling waste liquid in artificial leather production, wherein wood powder is used as a high polymer raw material, a series of processing is carried out to prepare an adsorption material, the high polymer adsorption material subjected to surface modification is used for separating and recycling organic solvents in the waste liquid, the material is applied to a fixed bed adsorber, high-temperature water vapor is used for resolving, regenerating and recycling, after the recycling treatment is completed, the adsorption material is repeatedly used by a magnetic separation method, the prepared adsorption material is large in adsorption quantity, high in recycling rate, good in universality and simple in operation, the recycling treatment effect of solvents such as butanone, methylbenzene and dimethylformamide used in artificial leather production is good, and secondary pollution can be avoided.
Description
Technical Field
The invention belongs to the technical field of novel functional materials, and particularly relates to a recovery treatment method of waste liquor in artificial leather production.
Background
Artificial leather is a plastic product that looks and feels like leather and can replace it. Usually, the fabric is used as a substrate and coated with synthetic resin and various plastic additives. Mainly comprises three types of PVC artificial leather, PU artificial leather and PU synthetic leather. In the eighties of the last century, expensive leather clothing and leather materials cannot be consumed by general people, and leather-imitated artificial leather is popular once according to market demands and is widely applied to clothing and bags. Therefore, the artificial leather clothes and bags imitating leather can be used for filling the street at one time, and the desire of people to wear leather is met. Compared with leather, artificial leather is easy to age and wear, and has harm to human health due to containing a large amount of chemical raw materials, and the clothes made of the artificial leather gradually lose the market due to being not durable until being replaced by other raw materials. Because of the difference in synthetic resins used in artificial leathers, the difference in types of substrates, the difference in production processes, the presence or absence of foaming, and the difference in use, artificial leathers can be classified into many types.
With the development of economic level, the demand of artificial leather in the market is gradually increased, and the artificial leather needs to use a large amount of organic solvents in production and preparation, so that a large amount of solvent waste liquid is discharged in the production process, and extremely serious problems of resource waste and environmental pollution are caused. Because the high-end purification treatment technology is high in cost and difficult to adopt, the existing solution method mostly adopts water for spraying and recycling, the recycling limitation is high, the recycling force is small, and a large amount of organic solvents are still discharged to the environment in different forms. In the past, the method not only causes serious pollution to the environment, but also causes great resource waste.
Disclosure of Invention
The invention aims to solve the existing problems and provides a method for recovering and treating waste liquor generated in artificial leather production, which has the advantages of high recovery rate, good universality, simple operation, good recovery and treatment effects on solvents such as butanone, toluene, dimethylformamide and the like used in artificial leather production and capability of avoiding secondary pollution.
The invention is realized by the following technical scheme:
a recovery processing method of waste liquid of artificial leather production, utilize macromolecule adsorption material after surface modification to separate and reclaim the organic solvent in the waste liquid, apply the material to the fixed bed adsorber, utilize the high-temperature water vapor to resolve and regenerate and reclaim, after the recovery processing is finished, the adsorption material utilizes the method of magnetic separation to recycle; the preparation method of the surface modified polymer adsorption material comprises the following steps:
(1) weighing 70-75 g of wood powder and 4.0-4.4 g of nano silicon nitride powder, adding the wood powder and the nano silicon nitride powder into a round-bottom flask, adding 330 plus 350 ml of potassium hydroxide-ethanol solution into the flask, shaking uniformly, putting the flask into a high-speed dispersion machine for dispersion for 5-6 minutes, taking out the flask, standing for 1.0-1.5 hours, then carrying out suction filtration, and putting the obtained solid into an oven at 80-90 ℃ for drying for 7-8 hours;
(2) adding the powder dried in the step (1) into a three-neck flask provided with an electric stirrer and a condenser tube, adding 140-150 ml of acetone and 1.2-1.3 g of dibutyltin dilaurate, stirring and mixing for 15-20 minutes, continuously adding 18-20 g of a surface modification modifier under stirring, reacting for 2-3 hours under the heating of a water bath at 55-60 ℃, then continuously heating to 70-75 ℃, continuously reacting for 40-45 minutes to obtain a product, regulating the pH value of the system to be neutral by using a phosphoric acid buffer solution, and then washing and filtering by using absolute ethyl alcohol to obtain the surface modified polymer adsorbing material.
As a further description of the above scheme, the particle size of the nano silicon nitride powder in step (1) is between 40 and 80 nanometers.
As a further description of the above scheme, the preparation method of the potassium hydroxide-ethanol solution in the step (1) is as follows: putting 9-10 g of dry potassium hydroxide into a beaker, adding 10-15 ml of deionized water, stirring for dissolving, transferring into a volumetric flask after dissolving, diluting with 90-95% ethanol solution to a constant volume of 1000 ml, shaking up, and sealing for storage.
As a further description of the above scheme, the dispersion speed in step (1) is 3000-3200 rpm.
As a further description of the above scheme, the preparation method of the surface modification modifier in step (2) is: weighing 4.8-5.0 ml of ammonium ceric nitrate, putting the ammonium ceric nitrate into 95-100 ml of ferrous chloride tetrahydrate solution with the molar concentration of 0.8-0.9 mol/L, quickly stirring uniformly, transferring the mixture into a three-neck flask, adding 50-60 ml of ethanol into the flask, dropwise adding 8-10 ml of methyl methacrylate under the protection of nitrogen, heating to 85-90 ℃ for reaction for 2-3 hours, and after the reaction is finished, carrying out rotary evaporation to remove an ethanol solvent to obtain a product, namely the surface modification modifier.
As a further description of the above scheme, the pH value of the phosphoric acid buffer solution in the step (2) is between 6.0 and 6.4.
Compared with the prior art, the invention has the following advantages: in order to solve the problem of improper organic solvent recovery processing mode in the existing artificial leather production and preparation, the invention provides a method for recovering and processing the waste liquid in the artificial leather production, which utilizes a macromolecule adsorbing material after surface modification to separate and recover the organic solvent in the waste liquid, applies the material in a fixed bed adsorber, utilizes high-temperature water vapor to perform analytic regeneration and recovery, and after the recovery processing is finished, the adsorbing material is repeatedly utilized by a magnetic separation method, the prepared adsorbing material has large adsorption capacity, high recovery rate, good universality and simple operation, has good recovery processing effect on solvents such as butanone, toluene, dimethyl formamide and the like used in the artificial leather production, and can avoid secondary pollution, the method for recovering and processing the waste liquid in the artificial leather production solves the problem of improper organic solvent recovery processing mode in the existing artificial leather production and preparation, the recovery efficiency is high, the residual quantity is small, the concentration of organic matters is far lower than the current discharge standard of pollutants for the synthetic leather and the artificial leather industry, the balance of reducing the recovery cost and protecting the environment is considered, the development and the utilization of the absorption and purification material are improved, the practical significance of promoting the industrial development of the artificial leather and the resource recycling can be realized, and the method is a technical scheme which is very worthy of popularization and use.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described with reference to specific embodiments, and it should be understood that the specific embodiments described herein are only used for explaining the present invention and are not used for limiting the technical solutions provided by the present invention.
Example 1
A recovery processing method of waste liquid of artificial leather production, utilize macromolecule adsorption material after surface modification to separate and reclaim the organic solvent in the waste liquid, apply the material to the fixed bed adsorber, utilize the high-temperature water vapor to resolve and regenerate and reclaim, after the recovery processing is finished, the adsorption material utilizes the method of magnetic separation to recycle; the preparation method of the surface modified polymer adsorption material comprises the following steps:
(1) weighing 70 g of wood powder and 4.0 g of nano silicon nitride powder, adding the wood powder and the 4.0 g of nano silicon nitride powder into a round-bottom flask, adding 330 ml of potassium hydroxide-ethanol solution into the flask, shaking and shaking uniformly, then putting the mixture into a high-speed dispersion machine for dispersion for 5 minutes, taking out the flask and standing for 1.0 hour, then carrying out suction filtration, and putting the obtained solid into an oven at 80 ℃ for baking for 7 hours;
(2) adding the powder dried in the step (1) into a three-neck flask provided with an electric stirrer and a condenser tube, adding 140 ml of acetone and 1.2 g of dibutyltin dilaurate, stirring and mixing for 15 minutes, continuously adding 18 g of surface modification modifier under stirring, reacting for 2 hours under the heating of water bath at 55 ℃, then continuously heating to 70 ℃, continuously reacting for 40 minutes to obtain a product, adjusting the pH value of the system to be neutral by using a phosphoric acid buffer solution, and then washing and filtering by using absolute ethyl alcohol to obtain the surface modified polymer adsorbing material.
As a further description of the above scheme, the particle size of the nano silicon nitride powder in step (1) is between 40 and 80 nanometers.
As a further description of the above scheme, the preparation method of the potassium hydroxide-ethanol solution in the step (1) is as follows: putting 9 g of dry potassium hydroxide into a beaker, adding 10 ml of deionized water, stirring and dissolving, transferring the solution into a volumetric flask after dissolving, diluting the solution to 1000 ml by using an ethanol solution with the mass concentration of 90%, shaking up, and sealing and storing.
As a further description of the above protocol, the dispersion rate in step (1) is 3000 rpm.
As a further description of the above scheme, the preparation method of the surface modification modifier in step (2) is: weighing 4.8 ml of ammonium ceric nitrate, placing the ammonium ceric nitrate in 95 ml of ferrous chloride tetrahydrate solution with the molar concentration of 0.8 mol/L, quickly and uniformly stirring, transferring the mixture into a three-neck flask, adding 50 ml of ethanol into the flask, dropwise adding 8 ml of methyl methacrylate under the protection of nitrogen, heating to 85 ℃ for reaction for 2 hours, and after the reaction is finished, performing rotary evaporation to remove an ethanol solvent to obtain a product, namely the surface modification modifier.
As a further description of the above scheme, the pH value of the phosphoric acid buffer solution in the step (2) is between 6.0 and 6.4.
Example 2
A recovery processing method of waste liquid of artificial leather production, utilize macromolecule adsorption material after surface modification to separate and reclaim the organic solvent in the waste liquid, apply the material to the fixed bed adsorber, utilize the high-temperature water vapor to resolve and regenerate and reclaim, after the recovery processing is finished, the adsorption material utilizes the method of magnetic separation to recycle; the preparation method of the surface modified polymer adsorption material comprises the following steps:
(1) weighing 72 g of wood powder and 4.2 g of nano silicon nitride powder, adding the wood powder and the nano silicon nitride powder into a round-bottom flask, adding 340 ml of potassium hydroxide-ethanol solution into the flask, shaking uniformly, putting the mixture into a high-speed dispersion machine for dispersion for 5.5 minutes, taking out the flask, standing for 1.2 hours, then carrying out suction filtration, and putting the obtained solid into an oven at 85 ℃ for baking for 7.5 hours;
(2) adding the powder dried in the step (1) into a three-neck flask provided with an electric stirrer and a condenser tube, adding 145 ml of acetone and 1.25 g of dibutyltin dilaurate, stirring and mixing for 18 minutes, continuously adding 19 g of surface modification modifier under stirring, reacting for 2.5 hours under the heating of a water bath at 58 ℃, then continuously heating to 72 ℃, continuously reacting for 43 minutes to obtain a product, adjusting the pH value of the system to be neutral by using a phosphoric acid buffer solution, and then washing and filtering by using absolute ethyl alcohol to obtain the surface modified polymer adsorbing material.
As a further description of the above scheme, the particle size of the nano silicon nitride powder in step (1) is between 40 and 80 nanometers.
As a further description of the above scheme, the preparation method of the potassium hydroxide-ethanol solution in the step (1) is as follows: putting 9.5 g of dry potassium hydroxide into a beaker, adding 13 ml of deionized water, stirring and dissolving, transferring the solution into a volumetric flask after dissolving, diluting the solution to 1000 ml by using an ethanol solution with the mass concentration of 93%, shaking up, and sealing and storing.
As a further description of the above protocol, the dispersion rate in step (1) is 3100 rpm.
As a further description of the above scheme, the preparation method of the surface modification modifier in step (2) is: weighing 4.9 ml of ammonium ceric nitrate, placing the ammonium ceric nitrate into 98 ml of ferrous chloride tetrahydrate solution with the molar concentration of 0.85 mol/L, quickly and uniformly stirring, transferring the solution into a three-neck flask, adding 55 ml of ethanol into the flask, dropwise adding 9 ml of methyl methacrylate under the protection of nitrogen, heating the solution to 88 ℃ for reaction for 2.5 hours, and after the reaction is finished, performing rotary evaporation to remove an ethanol solvent to obtain a product, namely the surface modification modifier.
As a further description of the above scheme, the pH value of the phosphoric acid buffer solution in the step (2) is between 6.0 and 6.4.
Example 3
A recovery processing method of waste liquid of artificial leather production, utilize macromolecule adsorption material after surface modification to separate and reclaim the organic solvent in the waste liquid, apply the material to the fixed bed adsorber, utilize the high-temperature water vapor to resolve and regenerate and reclaim, after the recovery processing is finished, the adsorption material utilizes the method of magnetic separation to recycle; the preparation method of the surface modified polymer adsorption material comprises the following steps:
(1) weighing 75 g of wood powder and 4.4 g of nano silicon nitride powder, adding the wood powder and the nano silicon nitride powder into a round-bottom flask, adding 350 ml of potassium hydroxide-ethanol solution into the flask, shaking uniformly, dispersing for 6 minutes in a high-speed dispersion machine, taking out the flask, standing for 1.5 hours, then carrying out suction filtration, and putting the obtained solid into a 90 ℃ oven to bake for 8 hours;
(2) adding the powder dried in the step (1) into a three-neck flask provided with an electric stirrer and a condenser tube, adding 150 ml of acetone and 1.3 g of dibutyltin dilaurate, stirring and mixing for 20 minutes, continuously adding 20 g of surface modification modifier under stirring, reacting for 3 hours under the heating of water bath at 60 ℃, then continuously heating to 75 ℃, continuously reacting for 45 minutes to obtain a product, adjusting the pH value of the system to be neutral by using a phosphoric acid buffer solution, and then washing and filtering by using absolute ethyl alcohol to obtain the surface modified polymer adsorbing material.
As a further description of the above scheme, the particle size of the nano silicon nitride powder in step (1) is between 40 and 80 nanometers.
As a further description of the above scheme, the preparation method of the potassium hydroxide-ethanol solution in the step (1) is as follows: putting 10 g of dry potassium hydroxide into a beaker, adding 15 ml of deionized water, stirring and dissolving, transferring the solution into a volumetric flask after dissolving, diluting the solution to 1000 ml by using an ethanol solution with the mass concentration of 95%, shaking up, and sealing and storing.
As a further description of the above protocol, the dispersion rate in step (1) was 3200 rpm.
As a further description of the above scheme, the preparation method of the surface modification modifier in step (2) is: weighing 5.0 ml of ammonium ceric nitrate, placing the ammonium ceric nitrate into 100 ml of ferrous chloride tetrahydrate solution with the molar concentration of 0.9 mol/L, quickly and uniformly stirring, transferring the mixture into a three-neck flask, adding 60 ml of ethanol into the flask, dropwise adding 10 ml of methyl methacrylate under the protection of nitrogen, heating the mixture to 90 ℃ for reaction for 3 hours, and after the reaction is finished, performing rotary evaporation to remove an ethanol solvent to obtain a product, namely the surface modification modifier.
As a further description of the above scheme, the pH value of the phosphoric acid buffer solution in the step (2) is between 6.0 and 6.4.
Comparative example 1
The difference from the example 1 is that, in the preparation process of the polymer adsorbing material after surface modification, the addition of the nano silicon nitride powder in the step (1) is omitted, and the rest is kept consistent.
Comparative example 2
The difference from example 2 is that, in the preparation process of the surface modified polymeric adsorbent material, a sodium hydroxide solution with a mass concentration of 15% is used instead of the potassium hydroxide-ethanol solution in step (1), and the rest is consistent.
Comparative example 3
The difference from example 3 is that, in the preparation process of the polymer adsorbing material after surface modification, the addition of dibutyltin dilaurate in the step (2) is omitted, and the rest is consistent.
Comparative example 4
The difference from example 3 is that, in the preparation process of the surface-modified polymeric adsorbent material, the addition of the surface modification modifier in step (2) is omitted, and the rest is kept consistent.
Comparative example 5
The only difference from example 3 is that the addition of the cerium ammonium nitrate and methyl methacrylate was omitted from the preparation of the surface modification modifier, and the rest remained the same.
Comparative experiment
The method of examples 1-3 and comparative examples 1-5 were used to recover the artificial leather waste liquid, the method related to the artificial leather waste water treatment method disclosed in patent publication No. CN104193111A was used as a control group, the artificial leather waste liquid with the same component content was divided into small samples with serial numbers, the artificial leather waste liquid was recovered according to the respective composition method, the content of dimethylformamide, butanone and toluene in the treatment waste liquid in each group of samples was measured, the obtained experimental data was an average value of 5 samples, the independent variables in the test were kept consistent, and the effective average value was counted, and the results are shown in the following table:
the method for recycling the waste liquid generated in the production of the artificial leather solves the problem of improper organic solvent recycling mode in the production and preparation of the existing artificial leather, has high recycling efficiency and small residual quantity, ensures that the concentration of organic matters is far lower than the current pollutant emission standard of synthetic leather and artificial leather industry, balances the reduction of recycling cost and environmental protection, improves the development and utilization of absorption and purification materials, can realize the practical significance of promoting the development of the artificial leather industry and recycling resources, and is a technical scheme which is extremely worthy of popularization and use.
Claims (5)
1. A recovery processing method of waste liquid of artificial leather production is characterized in that a macromolecule adsorption material modified by surface modification is used for separating and recovering an organic solvent in the waste liquid; the preparation method of the surface modified polymer adsorption material comprises the following steps:
(1) weighing 70-75 g of wood powder and 4.0-4.4 g of nano silicon nitride powder, adding the wood powder and the nano silicon nitride powder into a round-bottom flask, adding 330 plus 350 ml of potassium hydroxide-ethanol solution into the flask, shaking uniformly, putting the flask into a high-speed dispersion machine for dispersion for 5-6 minutes, taking out the flask, standing for 1.0-1.5 hours, then carrying out suction filtration, and putting the obtained solid into an oven at 80-90 ℃ for drying for 7-8 hours;
(2) adding the powder dried in the step (1) into a three-neck flask provided with an electric stirrer and a condenser tube, adding 140-150 ml of acetone and 1.2-1.3 g of dibutyltin dilaurate, stirring and mixing for 15-20 minutes, continuously adding 18-20 g of a surface modification modifier under stirring, reacting for 2-3 hours under the heating of a water bath at 55-60 ℃, then continuously heating to 70-75 ℃, continuously reacting for 40-45 minutes to obtain a product, regulating the pH value of the system to be neutral by using a phosphoric acid buffer solution, and then washing and filtering by using absolute ethyl alcohol to obtain a surface modified polymer adsorbing material;
the preparation method of the surface modification modifier in the step (2) comprises the following steps: weighing 4.8-5.0 ml of ammonium ceric nitrate, putting the ammonium ceric nitrate into 95-100 ml of ferrous chloride tetrahydrate solution with the molar concentration of 0.8-0.9 mol/L, quickly stirring uniformly, transferring the mixture into a three-neck flask, adding 50-60 ml of ethanol into the flask, dropwise adding 8-10 ml of methyl methacrylate under the protection of nitrogen, heating to 85-90 ℃ for reaction for 2-3 hours, and after the reaction is finished, carrying out rotary evaporation to remove an ethanol solvent to obtain a product, namely the surface modification modifier.
2. The method for recycling waste liquor from the production of artificial leather according to claim 1, wherein the particle size of the nano silicon nitride powder in step (1) is 40-80 nm.
3. The method for recycling waste liquor from the production of artificial leather according to claim 1, wherein the method for preparing the potassium hydroxide-ethanol solution in step (1) comprises: putting 9-10 g of dry potassium hydroxide into a beaker, adding 10-15 ml of deionized water, stirring for dissolving, transferring into a volumetric flask after dissolving, diluting with 90-95% ethanol solution to a constant volume of 1000 ml, shaking up, and sealing for storage.
4. The method for recycling waste liquid from the production of artificial leather as claimed in claim 1, wherein the dispersion speed in step (1) is 3000-3200 rpm.
5. The method for recycling waste liquor from the production of artificial leather according to claim 1, wherein the pH value of said phosphoric acid buffer solution in the step (2) is 6.0 to 6.4.
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