CN103599815B - The immobilized perfluorinated sulfonic resin catalyst of active carbon and for catalyzing and synthesizing (methyl) acrylic acid alkoxyalkyl methacrylate - Google Patents
The immobilized perfluorinated sulfonic resin catalyst of active carbon and for catalyzing and synthesizing (methyl) acrylic acid alkoxyalkyl methacrylate Download PDFInfo
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Abstract
It take active carbon as carrier to the present invention relates to the immobilized perfluorinated sulfonic resin catalyst of a kind of active carbon, and chlorine industry is discarded amberplex and to be extracted and the perfluor sulfoacid resin solution prepared is made as active component.For the synthesis of the method for (methyl) acrylic acid alkoxyalkyl methacrylate, reactant: (methyl) acrylic acid and ethylene glycol monoalkyl ether mol ratio are 1:1 ~ 1:2, dehydrating agent toluene mass percent consumption is 10 ~ 40% of reactant gross mass, polymerization inhibitor phenthazine mass percent consumption is 0.05 ~ 0.30% of reactant gross mass, the consumption of the immobilized perfluorinated sulfonic resin catalyst of the described active carbon of one of claims 1 to 3 accounts for 1 ~ 5% of reactant gross mass, reaction temperature is 124 ~ 140 DEG C, and the reaction time is 3 ~ 5h.Catalyst prepared by the present invention has abundant pore structure, larger specific area, good heat endurance and chemical stability.
Description
Technical field
The present invention relates to the preparation method of the immobilized perfluorinated sulfonic resin catalyst of a kind of active carbon, for catalyzing and synthesizing (methyl) acrylic acid alkoxyalkyl methacrylate, belonging to field of chemical technology.
Background technology
(methyl) acrylic acid alkoxyalkyl methacrylate [CH
2=C (CH
3) COOCH
2cH
2oR; R can be methyl, ethyl, butyl, phenyl etc.] be important organic active monomer, because containing unsaturated carbon-carbon double bond in structure, can with many monomer generation copolymerization and homopolymerization, and this monomer contains ehter bond side chain, its polymer or copolymer have important effect in resin, coating, adhesive, medical material.
At present, the synthetic route of (methyl) acrylic acid alkoxyalkyl methacrylate have that ester-interchange method, (methyl) acryloyl chloride and ethylene glycol monoalkyl ether react, direct esterification etc.CN102351693A and CN102850217A describes and prepares methoxyethyl methacrylate with ester-interchange method, with methyl methacrylate and glycol monoethyl ether for raw material, under catalyst and polymerization inhibitor existent condition, reactive distillation ester exchange process is adopted to react, the methyl alcohol that reaction generates is removed in time by azeotropic distillation, and the product containing methoxyethyl methacrylate obtained is distilled at reduced pressure conditions, after removing excessive methyl methacrylate, Removal of catalyst and polymerization inhibitor again, obtains methoxyethyl methacrylate product.
Catalyst for esterification reaction is the focus of research always, the homogeneous acid catalyst such as sulfuric acid, p-methyl benzenesulfonic acid, niter cake that industry is commonly used is post-treated simply gradually, high, the eco-friendly solid acid catalyst of esterification yield replaced, as series of new solid catalysts such as molecular sieve, carried heteropoly acid, acidic resins, solid super-strong acids.
CN101475475 describes the SO utilizing preparation
4 2-/ TiO
2solid super acid catalyst direct esterification catalyzes and synthesizes (methyl) acrylic acid alkoxyalkyl methacrylate, and (methyl) acrylic acid one way esterification yield reaches 99 %, but the stability of its catalyst is not good, and acidic-group easily comes off, and can not be cycled to used in this reaction system.
Nearly ten years, active carbon as the environment protection catalytic carrier of cheapness quite by the concern of people, the research especially in activated carbon surface microstructure, activated carbon modified, surface active groups qualitative and quantitative etc.The pore structure of active carbon prosperity, larger specific area and good heat endurance, chemical stability gives it becomes excellent catalyst carrier.
Perfluorinated sulfonic resin (Nafion-H) is researched and developed by du pont company, is chlorine industry " heart "---the main component of perfluorinated sulfonic acid ion exchange membrane.Perfluorinated sulfonic resin is green solid acid catalyst, has good catalytic activity and selective to many reactions.But because perfluorinated sulfonic resin specific surface is lower, the acid centre be buried in fluorocarbon radical body is not easily close by reactant institute, greatly reduces its catalytic activity.
CN1699450A and ZL200510046751.8 describes the method being extracted high-purity perfluor sulfoacid resin solution by discarded amberplex, and the recycling for expensive perfluorinated sulfonic resin provides a good thinking.
The defects such as perfluorinated sulfonic resin specific area is little in order to overcome, activated centre exposed amount is low, the present invention take active carbon as carrier, develop the immobilized perfluorinated sulfonic resin novel catalyst system of a kind of active carbon, by perfluorinated sulfonic resin in discarded for extraction amberplex, and make purer perfluor sulfoacid resin solution, the feature that binding activities charcoal hole is flourishing, specific area is large, prepares the immobilized perfluorinated sulfonic resin catalyst of active carbon.This catalyst preparation process is simple, and this catalyst belongs to hydrophobic material simultaneously, and it can effectively absorb organic molecule and not absorb water.When there being water to exist, which obviating Bronsted acid position and easily aquation occur and reduce the problem of catalytic activity, and contribute to the contact of reactant and sour position and promote that reaction is carried out.
Summary of the invention
An object of the present invention is to overcome above-mentioned deficiency, there is provided a kind of active carbon immobilized perfluorinated sulfonic resin catalyst, it is novel, green solid superacid as catalyst system, this catalyst has good catalytic performance in the synthesis of (methyl) acrylic acid alkoxyalkyl methacrylate, and catalyst can repeatedly circulate.
Two of object of the present invention is to provide the immobilized perfluorinated sulfonic resin of a kind of active carbon to catalyze and synthesize the method for (methyl) acrylic acid alkoxyalkyl methacrylate.
The present invention is achieved in that
The immobilized perfluorinated sulfonic resin catalyst of a kind of active carbon, it take active carbon as carrier, chlorine industry discard amberplex extract and the perfluor sulfoacid resin solution prepared as active component.
First Activated Carbon Pretreatment is carried out: the wood activated charcoal that base charcoal selects phosphoric acid activation method to prepare, first at Muffle furnace 500 ~ 800 DEG C of roasting 2 ~ 4 h, be 40 ~ 70 DEG C, nitric acid dipping backflow 3 ~ 5 h of 5 ~ 30 % again with concentration, with distilled water, active carbon is washed till cleaning solution pH in neutral after suction filtration, dry, 100 ~ 120 DEG C of activation 2 ~ 3 h.The object of carrying out Activated Carbon Pretreatment is reaming and the oxygen-containing acid group increasing activated carbon surface.
Take a certain amount of pretreated active carbon and chlorine industry discard amberplex extract and the perfluor sulfoacid resin solution prepared (concentration mass fraction is about 4.5 %, preparation method is with reference to ZL200510046751.8) in water-bath backflow dipping 0.5 ~ 2 h of 70 ~ 80 DEG C, solvent evaporated at 80 ~ 95 DEG C again, constant weight is dried in 100 ~ 120 DEG C of baking ovens, for subsequent use after grinding.
Catalyst after grinding mixes with the ratio of mass ratio 1 ︰ 10 with 5 ~ 30 % inorganic acid aqueous solutions, backflow 2 ~ 3 h is flooded at 45 ~ 80 DEG C, suction filtration and with distilled water washing catalyst to cleaning solution pH in neutral, suction filtration is dried to constant weight, 100 ~ 120 DEG C of activation 2 ~ 3 h, obtain the immobilized perfluorinated sulfonic resin catalyst of prepared active carbon.
The suitable load capacity of described active carbon immobilized perfluorinated sulfonic resin catalyst is that 5 ~ 40 %(active components account for catalyst gross mass percentage).
The immobilized perfluorinated sulfonic resin of a kind of active carbon catalyzes and synthesizes the method for (methyl) acrylic acid alkoxyalkyl methacrylate, the molar ratio of this reaction is: (methyl) acrylic acid and ethylene glycol monoalkyl ether mol ratio are 1 ︰ 1 ~ 1 ︰ 2, and the mol ratio that (methyl) acrylic acid and ethylene glycol monoalkyl ether are suitable for is 1 ︰ 1.2 ~ 1 ︰ 1.4;
(methyl) acrylic acid described in literary composition is acrylic acid or methacrylic acid.
Because part ethylene glycol monoalkyl ether can be taken out of on a small quantity with the azeotropic of water entrainer and water, ethylene glycol monoalkyl ether excessive few, is unfavorable for that balance moves to right movement, causes reaction esterification yield too low; Ethylene glycol monoalkyl ether greatly excessive, esterification yield increases limited, but causes the energy consumption removing excessive ethylene glycol monoalkyl ether large, and esterification reaction equipment utilization rate is lower, inadvisable economically.
Described azeotropic aqua toluene mass percent consumption is 10 ~ 40 % of reactant gross mass, and suitable toluene consumption is 25 ~ 30 % of reactant gross mass.
Water entrainer consumption is too low, and the water that can not fully generate with reaction forms azeotropic mixture, causes band water poor effect; The consumption of water entrainer is closely related with reaction temperature simultaneously, and water entrainer amount crosses conference makes the too low esterification yield that causes of reaction system equilibrium temperature reduce.
Described polymerization inhibitor phenthazine mass percent consumption is 0.05 ~ 0.30 % of reactant gross mass, suitable phenthazine consumption is 0.15 ~ 0.30 %, because in course of reaction, polymerization inhibitor phenthazine has a process linearly consumed, and the amount of polymerization inhibitor crosses that I haven't seen you for ages makes reaction produce polymerism.
It is 124 ~ 140 DEG C that reaction system is suitable for reaction temperature, and the too high meeting of reaction temperature makes reaction side reaction increase.Raw material alcohol ether is taken out of for easy azeotropic, ethylene glycol monoalkyl ether can be reduced by the mode of temperature programming and together take out of with the water generated, thus can esterification yield be improved.
Optimum reacting time is 3 ~ 5 h, and reaction time long meeting is because of the consumption of polymerization inhibitor, and byproduct of reaction increase is even polymerized.
The immobilized perfluorinated sulfonic resin catalyst amount of described active carbon accounts for 1 ~ 5 % of reactant gross mass, and suitable catalyst amount is 2 ~ 3 % of reactant gross mass.
Advantage of the present invention is: develop the immobilized perfluorinated sulfonic resin solid super acid catalyst of novel active carbon, it take active carbon as carrier, discarded amberplex extracts and the perfluor sulfoacid resin solution prepared is active component, adopt the method for dipping-solvent evaporated, make the immobilized perfluorinated sulfonic resin catalyst of active carbon.This catalyst has good catalytic performance in the synthesis of (methyl) acrylic acid alkoxyalkyl methacrylate, and with product convenient separation, and catalyst can repeatedly circulate.Active carbon prepared by the present invention immobilized perfluorinated sulfonic resin catalyst has abundant pore structure, larger specific area, good heat endurance and chemical stability, has good application prospect.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in more detail.
The acrylic acid that the present invention uses, methacrylic acid, phenthazine are technical grade, Chemical Reagent Co., Ltd., Sinopharm Group; Glycol monoethyl ether, ethylene glycol monobutyl ether, ethyleneglycol monophenylether are technical grade, Jiangsu Yida Chemical Co., Ltd.; Active carbon is technical grade, Jiangsu Zhu Hai active carbon Co., Ltd; Toluene is SILVER REAGENT, Nanjing Chemistry Reagent Co., Ltd.; Perfluorinated sulfonic acid ion exchange membrane genuine man is E.I.Du Pont Company.
Example 1: the preparation of the immobilized perfluorinated sulfonic resin catalyst of active carbon
Take wood activated charcoal prepared by 15.0 g phosphoric acid activation methods, 500 DEG C of roasting 2 h in Muffle furnace, nitric acid 100.0 g being 30 % with concentration again refluxes 3 h in 40 DEG C of water-baths, suction filtration is also washed with distilled water to cleaning solution pH in neutral, 100 DEG C of oven for drying are to constant weight, and 120 DEG C activate 2 h.
BET analyzes the specific area of modified support by 935.6 original m
2/ g brings up to 1086.9 m
2/ g; Boehm titration determination modified support surface-bound carboxylic content brings up to 2.4445 mmol/g by 1.4775 original mmol/g simultaneously, lactone group content is reduced to 0.0780 mmol/g by 0.0955 original mmol/g, and phenolic hydroxyl group brings up to 0.0992 mmol/g by 0.0446 mmol/g.
The perfluor sulfoacid resin solution (mass fraction is 4.5%) that the pretreated active carbon of 10.0 g and 100.0 g extract from exhausted perfluoro sulfonic acid ion exchange membrane is added respectively in the there-necked flask of 500 ml that thermometer is housed, magnetic agitation dipping backflow 1 h in 80 DEG C of water-baths, at 90 DEG C, solvent evaporated takes out solid again, dry to constant weight for 100 DEG C, the catalyst ground after sieve (100 order) mixes with the solid-to-liquid ratio of 1 ︰ 10 with 5 % aqueous sulfuric acids, backflow 2 h is flooded at 45 DEG C, suction filtration also uses distilled water washing catalyst to cleaning solution pH in neutral, suction filtration is dried to constant weight, 120 DEG C of activation 3 h, weigh solid 14.3 g, obtain the immobilized perfluorinated sulfonic resin catalyst of active carbon (that is: PFSA/AC catalyst) that load capacity is 30 %.
Example 2
Take wood activated charcoal prepared by 15.0 g phosphoric acid activation methods, 500 DEG C of roasting 2 h in Muffle furnace, nitric acid 100.0 g being 20 % with concentration again refluxes 3 h in 60 DEG C of water-baths, suction filtration is also washed with distilled water to cleaning solution pH in neutral, 100 DEG C of oven for drying are to constant weight, and 120 DEG C activate 2 h.
BET analyzes the specific area of modified support by 935.6 original m
2/ g brings up to 1141.0 m
2/ g; Boehm titration determination modified support surface-bound carboxylic content brings up to 2.3252 mmol/g by 1.4775 original mmol/g simultaneously, lactone group content is reduced to 0.0792 mmol/g by 0.0955 original mmol/g, and phenolic hydroxyl group brings up to 0.0988 mmol/g by 0.0446 mmol/g.
The perfluor sulfoacid resin solution (mass fraction is 4.5%) that the pretreated active carbon of 10.0 g and 25.5 g extract from exhausted perfluoro sulfonic acid ion exchange membrane is added respectively in the there-necked flask of 500 ml that thermometer is housed, magnetic agitation dipping backflow 2 h in 80 DEG C of water-baths, at 90 DEG C, solvent evaporated takes out solid again, dry to constant weight for 100 DEG C, the catalyst ground after sieve (100 order) mixes with the solid-to-liquid ratio of 1 ︰ 10 with 10 % aqueous sulfuric acids, backflow 2 h is flooded at 80 DEG C, suction filtration also uses distilled water washing catalyst to cleaning solution pH in neutral, suction filtration is dried to constant weight, 120 DEG C of activation 3 h, weigh solid 11.1 g, obtain the immobilized perfluorinated sulfonic resin catalyst of active carbon that load capacity is 10 %.
Example 3
Take wood activated charcoal prepared by 15.0 g phosphoric acid activation methods, 500 DEG C of roasting 2 h in Muffle furnace, nitric acid 100.0 g being 10 % with concentration again refluxes 3 h in 60 DEG C of water-baths, suction filtration is also washed with distilled water to cleaning solution pH in neutral, 100 DEG C of oven for drying are to constant weight, and 120 DEG C activate 2 h.
BET analyzes the specific area of modified support by 935.6 original m
2/ g brings up to 1159.1 m
2/ g; Boehm titration determination modified support surface-bound carboxylic content brings up to 2.3056 mmol/g by 1.4775 original mmol/g simultaneously, lactone group content is reduced to 0.0803 mmol/g by 0.0955 original mmol/g, and phenolic hydroxyl group brings up to 0.0937 mmol/g by 0.0446 mmol/g.
The perfluor sulfoacid resin solution (mass fraction is 4.5%) that the pretreated active carbon of 10.0 g and 150.0 g extract from exhausted perfluoro sulfonic acid ion exchange membrane is added respectively in the there-necked flask of 500 ml that thermometer is housed, magnetic agitation dipping backflow 2 h in 80 DEG C of water-baths, at 95 DEG C, solvent evaporated takes out solid again, dry to constant weight for 100 DEG C, the catalyst ground after sieve (100 order) mixes with the solid-to-liquid ratio of 1 ︰ 10 with 10 % aqueous sulfuric acids, backflow 2 h is flooded at 80 DEG C, suction filtration also uses distilled water washing catalyst to cleaning solution pH in neutral, suction filtration is dried to constant weight, 120 DEG C of activation 3 h, weigh solid 16.4 g, obtain the immobilized perfluorinated sulfonic resin catalyst of active carbon that load capacity is 40 %.
Example 4
Methacrylic acid is added respectively and ethylene glycol monobutyl ether mol ratio is 1 ︰ 1.2 in the 500 ml there-necked flasks that water knockout drum, reflux condenser φ 2.5 × 70 packed tower, thermometer are housed, 35 %PFSA/AC catalyst 3 %(prepared by example 1 account for raw material gross mass, lower same), water entrainer toluene 30 %(accounts for raw material gross mass, lower same), polymerization inhibitor phenthazine 0.15 %(accounts for raw material gross mass, lower same), magnetic agitation also controls reaction temperature 124 ~ 140 DEG C, reaction is kept to be in fluidized state all the time, back flow reaction 4 h, the esterification yield of methacrylic acid is 83.1 %.
Example 5
Acrylic acid is added respectively and glycol monoethyl ether mol ratio is 1 ︰ 1.4 in the 500 ml there-necked flasks that water knockout drum, reflux condenser φ 2.5 × 70 packed tower, thermometer are housed, 20 %PFSA/AC catalyst 3 % prepared by example 2, water entrainer toluene 30 %, polymerization inhibitor phenthazine 0.15 %, magnetic agitation also controls reaction temperature 120 ~ 130 DEG C, keep reaction to be in fluidized state all the time, back flow reaction 4 h, acrylic acid esterification yield is 87.9 %.
Example 6
Methacrylic acid is added respectively and ethyleneglycol monophenylether mol ratio is 1 ︰ 1.2 in the 500 ml there-necked flasks that water knockout drum, reflux condenser φ 2.5 × 70 packed tower, thermometer are housed, 30 %PFSA/AC catalyst 3 % prepared by example 1, water entrainer toluene 30 %, polymerization inhibitor phenthazine 0.15 %, magnetic agitation also controls reaction temperature 140 ~ 160 DEG C, keep reaction to be in fluidized state all the time, back flow reaction 3 h, the esterification yield of methacrylic acid is 90.5 %.
Example 7
Acrylic acid is added respectively and ethyleneglycol monophenylether mol ratio is 1 ︰ 1.2 in the 500 ml there-necked flasks that water knockout drum, reflux condenser φ 2.5 × 70 packed tower, thermometer are housed, 35 %PFSA/AC catalyst 2 % prepared by example 1, water entrainer toluene 25 %, polymerization inhibitor phenthazine 0.15 %, magnetic agitation also controls reaction temperature 140 ~ 160 DEG C, keep reaction to be in fluidized state all the time, back flow reaction 3 h, acrylic acid esterification yield is 88.1 %.
Example 8
Methacrylic acid is added respectively and glycol monoethyl ether mol ratio is 1 ︰ 1.4 in the 500 ml there-necked flasks that water knockout drum, reflux condenser φ 2.5 × 70 packed tower, thermometer are housed, 20 %PFSA/AC catalyst 3 % prepared by example 2, water entrainer toluene 30 %, polymerization inhibitor phenthazine 0.15 %, magnetic agitation also controls reaction temperature 120 ~ 130 DEG C, keep reaction to be in fluidized state all the time, back flow reaction 6 h, the esterification yield of methacrylic acid is 81.0 %.
Example 9
Methacrylic acid is added respectively and ethylene glycol monobutyl ether mol ratio is 1 ︰ 1.2 in the 500 ml there-necked flasks that water knockout drum, reflux condenser φ 2.5 × 70 packed tower, thermometer are housed, 10 %PFSA/AC catalyst 1% prepared by example 3, water entrainer toluene 30%, polymerization inhibitor phenthazine 0.15 %, magnetic agitation also controls reaction temperature 124 ~ 140 DEG C, keep reaction to be in fluidized state all the time, back flow reaction 8 h, the esterification yield of methacrylic acid is 75.6 %.
Example 10
Methacrylic acid is added respectively and ethylene glycol monobutyl ether mol ratio is 1 ︰ 1.2 in the 500 ml there-necked flasks that water knockout drum, reflux condenser φ 2.5 × 70 packed tower, thermometer are housed, 20 %PFSA/AC catalyst 3 % prepared by example 2, water entrainer toluene 30 %, polymerization inhibitor phenthazine 0.15 %, magnetic agitation also controls reaction temperature 124 ~ 140 DEG C, keep reaction to be in fluidized state all the time, back flow reaction 8 h, the esterification yield of methacrylic acid is 78.7 %.
Claims (7)
1. the immobilized perfluorinated sulfonic resin catalyst of active carbon, is characterized in that: it take active carbon as carrier, chlorine industry discard amberplex extract and the perfluor sulfoacid resin solution prepared as active component, adopt the method for dipping-solvent evaporated obtained;
The preparation method of the immobilized perfluorinated sulfonic resin catalyst of described active carbon comprises the steps:
First Activated Carbon Pretreatment is carried out: the wood activated charcoal that base charcoal selects phosphoric acid activation method to prepare, first at Muffle furnace 500 ~ 800 DEG C of roasting 2 ~ 4 h, be 40 ~ 70 DEG C, nitric acid dipping backflow 3 ~ 5 h of 5 ~ 30 % again with concentration, with distilled water, active carbon is washed till cleaning solution pH in neutral after suction filtration, dry, 100 ~ 120 DEG C of activation 2 ~ 3 h;
Take a certain amount of pretreated active carbon and chlorine industry to discard amberplex and extract and the perfluor sulfoacid resin solution prepared, the concentration mass fraction of described perfluor sulfoacid resin solution is 4.0 ~ 5.0 %, in water-bath backflow dipping 0.5 ~ 2 h of 70 ~ 80 DEG C, solvent evaporated at 80 ~ 95 DEG C again, constant weight is dried in 100 ~ 120 DEG C of baking ovens, for subsequent use after grinding;
Catalyst after grinding mixes with the ratio of mass ratio 1 ︰ 8-12 with 5 ~ 30 % inorganic acid aqueous solutions, backflow 2 ~ 3 h is flooded at 45 ~ 80 DEG C, suction filtration and with distilled water washing catalyst to cleaning solution pH in neutral, suction filtration is dried to constant weight, 100 ~ 120 DEG C of activation 2 ~ 3 h, obtain the immobilized perfluorinated sulfonic resin catalyst of prepared active carbon.
2. the immobilized perfluorinated sulfonic resin catalyst of active carbon according to claim 1, is characterized in that: the load capacity of the immobilized perfluorinated sulfonic resin catalyst of described active carbon is 5 ~ 40 %.
3. the immobilized perfluorinated sulfonic resin catalyst of active carbon is for the synthesis of the method for methacrylic ethyl ester or acrylic acid alkoxyalkyl methacrylate, it is characterized in that, reactant: methacrylic acid or acrylic acid and ethylene glycol monoalkyl ether mol ratio are 1 ︰ 1 ~ 1 ︰ 2, toluene mass percent consumption is 10 ~ 40 % of reactant gross mass, polymerization inhibitor phenthazine mass percent consumption is 0.05 ~ 0.30 % of reactant gross mass, the immobilized perfluorinated sulfonic resin catalyst amount of the described active carbon of one of claim 1 to 2 accounts for 1 ~ 5 % of reactant gross mass, reaction temperature is 124 ~ 140 DEG C, reaction time is 3 ~ 5 h.
4. the immobilized perfluorinated sulfonic resin catalyst of active carbon according to claim 3 is for the synthesis of the method for methacrylic ethyl ester or acrylic acid alkoxyalkyl methacrylate, it is characterized in that, methacrylic acid or acrylic acid and the suitable mol ratio of ethylene glycol monoalkyl ether are 1 ︰ 1.2 ~ 1 ︰ 1.4.
5. the immobilized perfluorinated sulfonic resin catalyst of active carbon according to claim 3 is for the synthesis of the method for methacrylic ethyl ester or acrylic acid alkoxyalkyl methacrylate, and it is characterized in that, dehydrating agent toluene consumption is 25 ~ 30 % of reactant gross mass.
6. the immobilized perfluorinated sulfonic resin catalyst of active carbon according to claim 3 is for the synthesis of the method for methacrylic ethyl ester or acrylic acid alkoxyalkyl methacrylate, it is characterized in that, polymerization inhibitor phenthazine consumption accounts for 0.15 ~ 0.30 % of reactant gross mass.
7. the immobilized perfluorinated sulfonic resin catalyst of active carbon according to claim 3 is for the synthesis of the method for methacrylic ethyl ester or acrylic acid alkoxyalkyl methacrylate, and it is characterized in that, catalyst amount accounts for 2 ~ 3 % of reactant gross mass.
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| CN1919826A (en) * | 2006-09-14 | 2007-02-28 | 南京林业大学 | Method for synthesizing acrylic acid and hydroxyalkyl methacrylate |
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