Method for catalytically converting fibers

Abstract

The invention relates to the technical field of chemical catalytic conversion of fiber wastes, in particular to a method for catalytically converting fibers. The method for catalytically converting the fibers comprises the following steps: mixing the fibers, a catalyst and a solvent for depolymerization reaction under a microwave condition, the catalyst comprises a monometal catalyst or a multi-metal catalyst; wherein the single-metal catalyst comprises a metal oxide and / or a metal simple substance; the multi-metal catalyst comprises a catalyst which takes the single-metal catalyst as a carrier and is loaded with another one or more single-metal catalysts. The functional catalyst with excellent catalytic activity is prepared through a simple and efficient catalyst forming method, the catalyst has excellent capacity of activating, catalyzing and breaking fiber skeleton chemical bonds, fibers can be effectively converted into chemicals mainly composed of monomers, and the whole process has the advantages of being low in cost, efficient, low in consumption and the like; good application prospects are realized.

Description

Technical Field

[0001] The invention relates to the technical field of chemical catalytic conversion of fiber waste, and in particular to a method for catalytic conversion of fibers. Background Art

[0002] The growth of global population and demand for consumer goods has led to a rapid increase in fiber production. According to statistics, global fiber production in 2021 is about 113 million tons. At the current growth rate, it is expected to reach 149 million tons by 2030. However, due to the rapid pace of social development and the change in people's current consumption concepts, the demand for textiles and their replacement have been further enhanced, resulting in a significant shortening of the life cycle of fiber products, which has generated a large amount of fiber waste, with an annual waste volume of about 92 million tons. Among these waste fibers, more than 70% are eventually landfilled or incinerated, and the recycling rate is as low as 1%, which has caused serious waste of precious resources and environmental pollution.

[0003] The selective catalytic conversion of fiber waste and its mixture into constituent monomers or value-added products under economical and low-consumption conditions plays a very important role in building a fiber recycling system, but it currently faces problems such as high temperature, long reaction time, and low catalyst efficiency. Therefore, the development of efficient fiber waste depolymerization catalysts and catalytic methods is of practical significance for accelerating the construction of a fiber recycling system. Summary of the invention

[0004] In order to solve the above problems in the prior art, the present invention provides a method for catalytic conversion of fibers. The catalyst prepared by the method is further applied to the microwave catalysis process of fiber waste, which can catalytically convert a variety of fiber wastes and mixtures into constituent monomers or value-added chemicals with a yield of more than 50%, and has the advantages of low cost, high efficiency and low consumption.

[0005] Based on this, the present invention has the following technical solutions: In a first aspect, the present invention provides a method for catalytic conversion of fibers, comprising: mixing fibers, a catalyst and a solvent for depolymerization reaction under microwave conditions; The catalyst comprises a single metal catalyst or a multi-metal catalyst; Wherein, the single metal catalyst includes metal oxide and / or metal element; the multi-metal catalyst includes: a catalyst using the single metal catalyst as a carrier and loaded with another or several other single metal catalysts.

[0006] In the present invention, the microwave frequency is 2450 MHz or 915 MHz; preferably, each gram of fiber waste consumes at least 1 W of microwave power.

[0007] Preferably, the preparation method of the single metal catalyst includes any one of the following: a) S1: mixing the precursor of the monometallic catalyst, water and a first alkaline substance to obtain a first mixed solution with a pH of 8 to 13; the first alkaline substance includes urea; S2: reacting the first mixed solution at 80-200° C., filtering after the reaction, and drying to obtain the single metal catalyst; and / or, b), S1': mixing the precursor of the single metal catalyst, water and a second alkaline substance to obtain a second mixed solution with a pH of 8 to 14; the second alkaline substance includes one or more of ammonia water, sodium hydroxide and potassium hydroxide; S2': reacting the second mixed solution under microwave conditions with a microwave power of 10-600 W; filtering after the reaction is completed, and obtaining the monometallic catalyst after drying; Among them, the precursors of the single metal catalyst include: iron, ferric nitrate, ferric citrate, ferric acetylacetonate, ferrous carbonate, ferric acetate, ferric chloride; cobalt, cobalt oxide, cobalt nitrate, cobalt acetate, cobalt chloride; zinc, zinc oxide, zinc nitrate, zinc acetate, zinc chloride; tungsten, tungsten chloride; aluminum oxide, aluminum nitrate, aluminum chloride; tetrabutyl titanate; tin, tin acetate; silicon dioxide, tetraethyl silicate; one or more of manganese, manganese acetate, manganese acetylacetonate and manganese carbonate.

[0008] In the present invention, the monometallic catalyst may also be one or more of commercially available cobalt, commercially available zinc, commercially available cobalt oxide, commercially available zinc oxide and commercially available aluminum oxide.

[0009] Preferably, the mass ratio of the precursor of the monometallic catalyst to water is (0.01-10):1; for example, it can be 0.01:1, 0.05:1, 0.1:1, 0.5:1, 1:1, 5:1 and 10:1, etc.

[0010] Preferably, the preparation method of the multi-metal catalyst includes any one of the following: c) S1'': mixing any two or more precursors of the single metal catalyst, water and a first alkaline substance to obtain a third mixed solution with a pH of 8 to 13; S2'': reacting the third mixed solution at 80-200° C., filtering after the reaction, and drying to obtain the multi-metal catalyst; and / or, d), S1''': mixing any two or more precursors of the single metal catalyst, water and a second alkaline substance to obtain a fourth mixed solution with a pH of 8 to 14; S2''': reacting the fourth mixed solution at 50-90° C. under microwave conditions with a microwave power of 10-600 W; filtering after the reaction is completed, and obtaining the multi-metal catalyst after drying; and / or, e), S1'''': mixing any one of the single-species catalysts, another or several other single-species catalyst precursors, a solvent and a first alkaline substance to obtain a fifth mixed solution with a pH of 8 to 13; S2'''': drying the fifth mixed solution at 50-100° C., and then reacting at 100-600° C., filtering after the reaction, and obtaining the multi-metal catalyst after drying; More preferably, in S2'''', the fifth mixed solution is dried at 50-100° C., and then calcined in air or protective gas at 100-600° C. for 1-6 h, and the protective gas includes hydrogen.

[0011] and / or, f), S1''''': mixing any one of the single-species catalysts, another or several other single-species catalyst precursors, water and a second alkaline substance to obtain a sixth mixed solution with a pH of 8 to 14; S2''''': drying the sixth mixed solution at 50-100° C., and then reacting it at 100-500° C. under microwave conditions with a microwave power of 10-600 W; filtering after the reaction, and obtaining the multi-metal catalyst after drying; More preferably, in S2''''', the sixth mixed solution is dried at 50-100° C., and then subjected to microwave treatment at 200-400° C. and 10-600 W in air or protective gas for 1-120 min, wherein the protective gas comprises hydrogen.

[0012] Among them, the precursors of the single metal catalyst include: iron, ferric nitrate, ferric citrate, ferric acetylacetonate, ferrous carbonate, ferric acetate, ferric chloride; cobalt, cobalt oxide, cobalt nitrate, cobalt acetate, cobalt chloride; zinc, zinc oxide, zinc nitrate, zinc acetate, zinc chloride; tungsten, tungsten chloride; aluminum oxide, aluminum nitrate, aluminum chloride; tetrabutyl titanate; tin, tin acetate; silicon dioxide, tetraethyl silicate; one or more of manganese, manganese acetate, manganese acetylacetonate and manganese carbonate; the first alkaline substance includes urea; the second alkaline substance includes one or more of ammonia water, sodium hydroxide and potassium hydroxide.

[0013] Preferably, the catalyst is a multi-metal catalyst; further preferably, the multi-metal catalyst includes ZnO / Al2O3, W / SiO2, SnCo, FeZn / Al2O3, CoW / Al2O3 or MnZn, and the above multi-metal catalyst can be obtained according to the aforementioned method.

[0014] Preferably, in S1'''', the mass ratio of the precursor of another or several other single-species catalysts to the single-species catalyst is 1:(0.01~10); for example, it can be 0.01:1, 0.05:1, 0.1:1, 0.5:1, 1:1, 5:1 and 10:1, etc.

[0015] Preferably, in S1''''', the mass ratio of the precursor of another or several other single-species catalysts to the single-species catalyst is 1:(0.01~10); for example, it can be 0.01:1, 0.05:1, 0.1:1, 0.5:1, 1:1, 5:1 and 10:1, etc.

[0016] Preferably, the mass ratio of the fiber to the catalyst is (0.01-100): (0.01-100).

[0017] More preferably, the mass ratio of the fiber to the catalyst is (10-50):1; for example, it can be 10:1, 15:1, 20:1, 25:1, 30:1, 35:1, 40:1, 45:1 and 50:1, etc.

[0018] Preferably, the temperature of the depolymerization reaction is 40-250° C., and the depolymerization reaction time is 0.05-8 h.

[0019] In a specific implementation process, the temperature of the depolymerization reaction can be 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, 210°C, 220°C, 230°C, 240°C or 250°C, as well as a numerical range with any two of the above numerical values ​​as endpoints.

[0020] Preferably, the fiber is catalytically converted by hydrolysis or alcoholysis; when the hydrolysis method is adopted, the solvent is water, an acidic solution or an alkaline solution, and when the alcoholysis method is adopted, the solvent includes one or more of methanol, ethanol and ethylene glycol.

[0021] In the present invention, the acidic solution and the alkaline solution can be regulated by hydrochloric acid, phosphoric acid, sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate, etc.

[0022] Furthermore, the present invention can realize the above reaction by microwave or reactor; the reaction pressure can be normal pressure or low pressure.

[0023] More preferably, the mass ratio of the solvent, the fiber and the catalyst is 1:(0.01-100):(0.01-100).

[0024] Preferably, the fiber includes any one of polyester, aramid, nylon and spandex, or a composite fiber of two or more of polyester, aramid, nylon and spandex.

[0025] In the present invention, the fibers are fiber waste.

[0026] Furthermore, the method for catalytic conversion of fibers described in the present invention can efficiently convert various fiber wastes and mixtures thereof into monomers and value-added chemicals, and has the advantages of being green and efficient.

[0027] The beneficial effects of the present invention are: The present invention prepares a functional catalyst with excellent catalytic activity through a simple and efficient catalyst molding method. This catalyst has excellent ability to activate and catalyze the breaking of chemical bonds in the fiber skeleton, and can effectively convert the fiber into chemicals mainly composed of constituent monomers. The entire process has the characteristics of low cost, high efficiency and low consumption, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a process flow chart provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Unless otherwise specified, the various raw materials used in the examples and comparative examples are commercially available conventional raw materials, and the technical means used are conventional means well known to those skilled in the art.

[0032] Example 1 This embodiment provides a microwave catalytic depolymerization method for polyester waste (see the process flow chart Figure 1 ), the specific steps are as follows: Polyester waste, methanol and ZnO / Al2O3 were mixed in a mass ratio of 50:100:1 and then placed in a microwave reactor. The reaction temperature and microwave irradiation power were set to 65°C and 200 W, and then the reaction was carried out for 60 min under stirring conditions. After the reaction was completed, unreacted polyester and dimethyl terephthalate were obtained by treatment. The depolymerization rate of polyester waste reached 95wt%, and the yield of dimethyl terephthalate reached 92%.

[0033] The ZnO / Al2O3 catalyst used in this embodiment was prepared as follows: zinc nitrate and deionized water were mixed uniformly in a mass ratio of 1:10, and then 0.1 times the amount of urea as deionized water was added thereto. After stirring, 0.2 times the amount of Al2O3 as deionized water was added. After mixing, the mixture was placed in a reactor and reacted at 100°C for 16 h. After the reaction was completed, the ZnO / Al2O3 catalyst was obtained by filtering and washing.

[0034] Example 2 This embodiment provides a microwave catalytic depolymerization method for polyester waste, and the specific operation steps are as follows: Polyester waste, methanol and Al2O3 were mixed in a mass ratio of 50:100:1 and then placed in a microwave reactor. The reaction temperature and microwave irradiation power were set to 65 °C and 200 W, and then the reaction was carried out for 60 min under stirring conditions. After the reaction was completed, unreacted polyester and dimethyl terephthalate were obtained. The depolymerization rate of polyester waste reached 65 wt%, and the yield of dimethyl terephthalate reached 50%.

[0035] Example 3 This embodiment provides a microwave catalytic depolymerization method for polyester waste, and the specific operation steps are as follows: Polyester waste, methanol and ZnO were mixed in a mass ratio of 50:100:1 and then placed in a microwave reactor. The reaction temperature and microwave irradiation power were set to 65 °C and 200 W, and then the reaction was carried out for 60 min under stirring conditions. After the reaction was completed, unreacted polyester and dimethyl terephthalate were obtained. The depolymerization rate of polyester waste reached 82 wt%, and the yield of dimethyl terephthalate reached 59%.

[0036] Example 4 This embodiment provides a microwave catalytic depolymerization method for spandex waste, and the specific operation steps are as follows: Spandex waste, ethylene glycol and W / SiO2 were mixed in a mass ratio of 100:600:7 and then placed in a microwave reactor. The reaction temperature and microwave irradiation power were set to 160 °C and 600 W, and then the mixture was stirred for 30 min. After the reaction, unreacted spandex and polytetrahydrofuran were obtained. The depolymerization rate of spandex waste reached 99.6 wt%, and the yields of polytetrahydrofuran and diphenylmethane diisocyanate reached 60% and 10%, respectively.

[0037] The W / SiO2 catalyst used in this embodiment was prepared as follows: tungsten chloride, tetraethyl silicate, deionized water and sodium hydroxide were uniformly mixed in a mass ratio of 1:6:36:2, and then placed in a microwave reactor for heating at 80 °C and 300 W for 60 min. After cooling, the mixture was filtered and washed to obtain the W / SiO2 catalyst.

[0038] Example 5 This embodiment provides a microwave catalytic depolymerization method for aramid waste, and the specific operation steps are as follows: Aramid waste, ethylene glycol, sodium hydroxide and SnCo were mixed in a mass ratio of 2:20:4:1 and then placed in a microwave reactor. The reaction temperature and microwave irradiation power were set to 200 °C and 700 W, and then the reaction lasted for 120 min. After the reaction, unreacted aramid, p-phenylenediamine and terephthalate were obtained. The depolymerization rate of aramid waste reached 80 wt%, and the yields of p-phenylenediamine and terephthalate reached 40% and 56%, respectively.

[0039] The SnCo catalyst used in this example was prepared as follows: tin acetate, cobalt nitrate, deionized water and ammonia water were uniformly mixed in a mass ratio of 2:1:50:10, and then placed in a microwave reactor for heating at 80 °C and 260 W for 80 min. After cooling, the SnCo catalyst was filtered and washed to obtain the SnCo catalyst.

[0040] Example 6 This embodiment provides a microwave catalytic depolymerization method for spandex and polyester composite waste, and the specific operation steps are as follows: The spandex polyester composite waste, ethylene glycol and FeZn / Al2O3 were mixed in a mass ratio of 100:300:3 and then placed in a microwave reactor. The reaction temperature and microwave irradiation power were set to 180 °C and 500 W, and then the reaction was carried out for 300 min. After the reaction was completed, unreacted fiber waste and polytetrahydrofuran, diphenylmethane diisocyanate and terephthalate were obtained. The depolymerization rate of the spandex polyester composite waste reached 90 wt%, and the yields of polytetrahydrofuran, diphenylmethane diisocyanate and terephthalate reached 15%, 2% and 56%, respectively.

[0041] The FeZn / Al2O3 catalyst used in this example was prepared as follows: ferric nitrate, zinc nitrate, deionized water, Al2O3 and sodium hydroxide were uniformly mixed in a mass ratio of 6:2:50:5, and then placed in a microwave reactor for heating at 70 °C and 400 W for 60 min. After cooling, the mixture was filtered and washed to obtain the FeZn / Al2O3 catalyst.

[0042] Example 7 This embodiment provides a microwave catalytic depolymerization method for nylon waste, and the specific operation steps are as follows: Nylon waste, ethylene glycol, phosphoric acid and CoW / Al2O3 were mixed in a mass ratio of 50:150:5:1 and then placed in a microwave reactor. The reaction temperature and microwave irradiation power were set to 190 °C and 600 W, and then the reaction was carried out for 100 min. After the reaction was completed, unreacted fiber waste and amide compounds were obtained. The depolymerization rate of nylon waste reached 68 wt%, and the yield of amide compounds reached 50%.

[0043] The CoW / Al2O3 catalyst used in this embodiment was prepared as follows: cobalt chloride, tungsten chloride, water, sodium hydroxide, and Al2O3 were uniformly mixed in a mass ratio of 10:5:200:1:100, then dried at 60 °C, heated at 450 °C in an air atmosphere for 240 min, and cooled to obtain a CoW / Al2O3 catalyst.

[0044] Example 8 This embodiment provides a microwave catalytic depolymerization method for spandex, polyester and nylon composite waste, and the specific operation steps are as follows: The spandex polyester nylon composite waste, ethylene glycol, phosphoric acid and MnZn were mixed in a mass ratio of 100:700:20:3 and then placed in a microwave reactor. The reaction temperature and microwave irradiation power were set to 180 °C and 800 W, and then the reaction was carried out for 200 min. After the reaction was completed, unreacted fiber waste and polytetrahydrofuran, diphenylmethane diisocyanate, terephthalate, and amide compounds were obtained. The depolymerization rate of the spandex polyester nylon composite waste reached 70 wt%, and the yields of polytetrahydrofuran, diphenylmethane diisocyanate, terephthalate, and amide compounds reached 33%, 6%, 35%, and 5%, respectively.

[0045] The MnZn catalyst used in this example was prepared as follows: manganese nitrate, ethanol, ammonia water, and ZnO were uniformly mixed in a mass ratio of 1:5:2:10, then dried at 60 °C, placed in a microwave reactor and heated at 350 °C, 500 W, and hydrogen atmosphere for 30 min, and then cooled to obtain the MnZn catalyst.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for catalytic conversion of fibers, characterized in that: include: Under microwave conditions, the fiber, catalyst and solvent are mixed to undergo depolymerization reaction; The catalyst comprises a single metal catalyst or a multi-metal catalyst; Wherein, the single metal catalyst includes metal oxide and / or metal element; the multi-metal catalyst includes: a catalyst using the single metal catalyst as a carrier and loaded with another or several other single metal catalysts.

2. The method for catalytic conversion of fibers according to claim 1, characterized in that: The preparation method of the single metal catalyst includes any one of the following: a）、 S1: mixing the precursor of the monometallic catalyst, water and a first alkaline substance to obtain a first mixed solution with a pH of 8 to 13; the first alkaline substance includes urea; S2: reacting the first mixed solution at 80-200° C., filtering after the reaction, and drying to obtain the single metal catalyst; and / or, b), S1': mixing the precursor of the monometallic catalyst, water and a second alkaline substance to obtain a second mixed solution with a pH of 8 to 14; the second alkaline substance includes one or more of ammonia water, sodium hydroxide and potassium hydroxide; S2': reacting the second mixed solution under microwave conditions, with a microwave power of 10-600 W; filtering after the reaction, and obtaining the monometallic catalyst after drying; Among them, the precursors of the single metal catalyst include: iron, ferric nitrate, ferric citrate, ferric acetylacetonate, ferrous carbonate, ferric acetate, ferric chloride; cobalt, cobalt oxide, cobalt nitrate, cobalt acetate, cobalt chloride; zinc, zinc oxide, zinc nitrate, zinc acetate, zinc chloride; tungsten, tungsten chloride; aluminum oxide, aluminum nitrate, aluminum chloride; tetrabutyl titanate; tin, tin acetate; silicon dioxide, tetraethyl silicate; one or more of manganese, manganese acetate, manganese acetylacetonate and manganese carbonate.

3. The method for catalytic conversion of fibers according to claim 2, characterized in that: The mass ratio of the precursor of the single metal catalyst to water is (0.01~10):

1.

4. The method for catalytic conversion of fibers according to any one of claims 1 to 3, characterized in that: The preparation method of the multi-metal catalyst includes any one of the following: c）、 S1'': mixing any two or more precursors of the single metal catalyst, water and a first alkaline substance to obtain a third mixed solution with a pH of 8 to 13; S2'': reacting the third mixed solution at 80-200° C., filtering after the reaction, and drying to obtain the multi-metal catalyst; and / or, d), S1''': mixing any two or more precursors of the single metal catalyst, water and a second alkaline substance to obtain a fourth mixed solution with a pH of 8 to 14; S2''': reacting the fourth mixed solution at 50-90° C. under microwave conditions with a microwave power of 10-600 W; filtering after the reaction is completed, and obtaining the multi-metal catalyst after drying; and / or, e), S1'''': mixing any one of the single-species catalysts, another or several other single-species catalyst precursors, a solvent and a first alkaline substance to obtain a fifth mixed solution with a pH of 8 to 13; S2'''': drying the fifth mixed solution at 50-100° C., and then reacting at 100-600° C., filtering after the reaction, and obtaining the multi-metal catalyst after drying; and / or, f), S1''''': mixing any one of the single-species catalysts, another or several other single-species catalyst precursors, water and a second alkaline substance to obtain a sixth mixed solution with a pH of 8 to 14; S2''''': drying the sixth mixed solution at 50-100° C., and then reacting it at 100-500° C. under microwave conditions with a microwave power of 10-600 W; filtering after the reaction, and obtaining the multi-metal catalyst after drying; Among them, the precursors of the single metal catalyst include: iron, ferric nitrate, ferric citrate, ferric acetylacetonate, ferrous carbonate, ferric acetate, ferric chloride; cobalt, cobalt oxide, cobalt nitrate, cobalt acetate, cobalt chloride; zinc, zinc oxide, zinc nitrate, zinc acetate, zinc chloride; tungsten, tungsten chloride; aluminum oxide, aluminum nitrate, aluminum chloride; tetrabutyl titanate; tin, tin acetate; silicon dioxide, tetraethyl silicate; one or more of manganese, manganese acetate, manganese acetylacetonate and manganese carbonate; the first alkaline substance includes urea; the second alkaline substance includes one or more of ammonia water, sodium hydroxide and potassium hydroxide.

5. The method for catalytic conversion of fibers according to claim 4, characterized in that: In S1'''', the mass ratio of the precursor of another or several other single-species catalysts to the single-species catalyst is 1:(0.01-10); And / or, in S1''''', the mass ratio of the precursor of another or several other single-species catalysts to the single-species catalyst is 1:(0.01~10).

6. The method for catalytic conversion of fibers according to any one of claims 1 to 5, characterized in that: The mass ratio of the fiber to the catalyst is (0.01-100): (0.01-100).

7. The method for catalytic conversion of fibers according to any one of claims 1 to 6, characterized in that: The temperature of the depolymerization reaction is 40-250° C., and the duration of the depolymerization reaction is 0.05-8 h.

8. The method for catalytic conversion of fibers according to any one of claims 1 to 7, characterized in that: Each gram of fiber waste consumes at least 1W of microwave power.

9. The method for catalytic conversion of fibers according to any one of claims 1 to 8, characterized in that: The fibers are catalytically converted by hydrolysis or alcoholysis; When the hydrolysis method is adopted, the solvent is water, an acidic solution or an alkaline solution, and when the alcoholysis method is adopted, the solvent includes one or more of methanol, ethanol and ethylene glycol; Preferably, the mass ratio of the solvent, the fiber and the catalyst is 1:(0.01-100):(0.01-100).

10. The method for catalytic conversion of fibers according to any one of claims 1 to 9, characterized in that: The fiber includes one or more of polyester, aramid, nylon and spandex; And / or, the fibers are fiber waste.

Images