Preparation method of styrene
A technology of styrene and alkali lignin, which is applied in chemical instruments and methods, chemical recovery, hydrocarbons, etc., can solve the problems of tall and large distillation towers, high reflux ratio, and large energy consumption, and achieve low production cost and high separation process The effect of simplifying and reducing production costs
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Embodiment 1
[0032] (1) Add 0.4g alkali lignin, 0.01g H-GN catalyst, 4g 30wt% hydrogen peroxide aqueous solution (m 碱木质素 :m H-GN催化剂 =40:1, m 碱木质素 :m 过氧化氢水溶液 =1:10), add 0.4mol / L NaOH solution to adjust the pH value of the reaction solution to 13; stir the reaction in a constant temperature oil bath at 60°C for 1h, and the reaction mixture becomes homogeneous and black after heating;
[0033] (2) After the reaction is completed, centrifuge, and the centrifuged solid is washed with deionized water, centrifuged three times, dried in an oven at 60°C for 12 hours, and the H-GN catalyst is recovered for recycling; the obtained supernatant is acidified to pH with concentrated hydrochloric acid It is 2, after static precipitation, centrifuge and filter the mixture, the obtained solid is dried in an oven at 100°C to recover undegraded alkali lignin, the obtained supernatant is extracted with ethyl acetate for 3 times, and rotary evaporated under reduced pressure in an oil bath at 55°C The drople...
Embodiment 2
[0037] (1) Add 0.4g alkali lignin, 0.01g H-GN catalyst, 4g 30wt% hydrogen peroxide aqueous solution (m 碱木质素 :m H-GN催化剂 =40:1, m 碱木质素 :m 过氧化氢水溶液 =1:10), add 0.4mol / L NaOH solution to adjust the pH value of the reaction solution to 13; stir and react in a constant temperature oil bath at 60°C for 5h, the reaction mixture becomes homogeneous and black after heating;
[0038] (2) After the reaction is completed, centrifuge, and the centrifuged solid is washed with deionized water, centrifuged three times, dried in an oven at 60°C for 12 hours, and the H-GN catalyst is recovered for recycling; the obtained supernatant is acidified to pH with concentrated hydrochloric acid It is 2, after static precipitation, centrifuge and filter the mixture, the obtained solid is dried in an oven at 100°C to recover undegraded alkali lignin, the obtained supernatant is extracted with ethyl acetate for 3 times, and rotary evaporated under reduced pressure in an oil bath at 55°C The droplet produ...
Embodiment 3
[0041] (1) Add 0.4g alkali lignin, 0.01g H-GN catalyst, 4g 30wt% hydrogen peroxide aqueous solution (m 碱木质素 :m H-GN催化剂 =40:1, m 碱木质素 :m 过氧化氢水溶液 =1:10), add 0.4mol / L NaOH solution to adjust the pH of the reaction solution to 13; stir and react in a constant temperature oil bath at 60°C for 9 hours, the reaction mixture becomes homogeneous and black after heating;
[0042] (2) After the reaction is completed, centrifuge, and the centrifuged solid is washed with deionized water, centrifuged three times, dried in an oven at 60°C for 12 hours, and the H-GN catalyst is recovered for recycling; the obtained supernatant is acidified to pH with concentrated hydrochloric acid It is 2, after static precipitation, centrifuge and filter the mixture, the obtained solid is dried in an oven at 100°C to recover undegraded alkali lignin, the obtained supernatant is extracted with ethyl acetate for 3 times, and rotary evaporated under reduced pressure in an oil bath at 55°C The droplet produc...
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