Cationic resin catalyst, preparation method thereof and catalytic application thereof in preparation of glycolic acid by methyl glycolate hydrolysis method
A technology of cationic resin and methyl glycolate, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of increased separation cost and conversion of methyl glycolate Low efficiency and other problems, to achieve the effect of increasing conversion rate, promoting complete hydrolysis, and shortening the process flow
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[0019] Example 1 Catalyst A
[0020] Suspension copolymerization system: mix 100g of styrene and 7g of divinylbenzene, wash twice with 1mol / l NaOH solution, and then wash twice with water to remove the polymerization inhibitor in the raw material; the porogen is cyclohexane, The initiator is cumene hydrogen peroxide, and the mass ratio of styrene to porogen and initiator is 1:0.1:0.005. The porogen and initiator are added to the mixture of styrene and divinylbenzene. After the initiator is dissolved, the whole is poured into a stirred tank containing a dispersant of 0.5% polyvinyl alcohol aqueous solution. The quality of the polyvinyl alcohol aqueous solution is the total mass of styrene, divinylbenzene, porogen and initiator 3 times
[0021] Copolymerization reaction: the speed is 80r / min, the temperature is first heated to 60°C, held for 2h, then heated to 70°C, held for 3h, finally heated to 90°C, held for 2h, then the polymer white balls are cooled and filtered;
[0022] Pore ...
Example Embodiment
[0024] Example 2 Catalyst B
[0025] Suspension copolymerization system: mix 100g of styrene and 7g of divinylbenzene, wash twice with 1mol / l NaOH solution, and then wash twice with water to remove the polymerization inhibitor in the raw material; the porogen is benzene, initiator It is azobis-isoheptanitrile, and the mass ratio of styrene to porogen and initiator is 1:0.1:0.005. The porogen and initiator are added to the mixture of styrene and divinylbenzene. After dissolving, pour the whole into a stirred tank filled with a dispersant of 1.0% methylcellulose aqueous solution. The mass of methylcellulose aqueous solution is the total mass of styrene, divinylbenzene, porogen and initiator 4 times of
[0026] Copolymerization reaction: the speed is 120r / min, the temperature is first heated to 60°C, held for 4h, then heated to 70°C, held for 6h, finally heated to 90°C, held for 1h, then the polymer white balls are cooled and filtered;
[0027] Pore purification: Place the polymer w...
Example Embodiment
[0029] Example 3 Catalyst C
[0030] Suspension copolymerization system: mix 100g of styrene and 7g of divinylbenzene, wash twice with 1mol / l NaOH solution, and then wash twice with water to remove the polymerization inhibitor in the raw material; the porogen is benzene, initiator It is benzoyl peroxide, and the mass ratio of styrene to porogen and initiator is 1:0.05:0.02. Add porogen and initiator to the mixture of styrene and divinylbenzene, and wait for the initiator to dissolve Then, the whole is poured into a stirred tank that has been filled with a 0.5% concentration of sodium dodecylbenzene sulfonate aqueous solution. The quality of the sodium dodecylbenzene sulfonate solution is styrene, divinylbenzene, and 3 times the total mass of porogen and initiator;
[0031] Copolymerization reaction: the speed is 80r / min, the temperature is first heated to 60°C, held for 2h, then heated to 70°C, held for 3h, finally heated to 90°C, held for 2h, then the polymer white balls are cool...
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