A kind of method for preparing acrolein
A technology of acrolein and glycerin, which is applied in chemical instruments and methods, preparation of carbon-based compounds, preparation of organic compounds, etc., can solve the problems of easy carbon deposition and deactivation of catalysts, low yield of acrolein, high reaction temperature, etc. Possibility, increase of reaction yield, effect of mild reaction conditions
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Embodiment 1
[0031] Mix 5ml of glycerin, 5ml of water, and 0.1g of concentrated sulfuric acid thoroughly, add 0.5g of silicon dioxide powder with a contact angle of 95 degrees and 5ml of decahydronaphthalene, and stir for two minutes under mechanical stirring at 2000 rpm to make a uniform Water-in-oil emulsion; heat the emulsion to 180°C, and collect the acrolein formed by the reaction until no liquid condenses and drops out. After nuclear magnetic detection, the conversion rate of glycerin reached 92%. The collected liquid was analyzed and the yield of acrolein was 25%. The reaction system was centrifuged, the supernatant was poured out and recovered by distillation to obtain decalin, and the paste Dissolve the substance in hot water, filter, wash the filter cake 3-5 times, dry it, and reuse it as emulsifier silicon dioxide powder.
Embodiment 2
[0033] Mix 4ml of glycerin, 6ml of water, and 0.5g of concentrated hydrochloric acid thoroughly, add 0.1g of silicon dioxide powder with a contact angle of 150 degrees and 8ml of decahydronaphthalene, and stir for 10 minutes under mechanical stirring at 1600 rpm to make a uniform Water-in-oil emulsion; heat the emulsion to 140°C, and collect the acrolein formed by the reaction until no liquid condenses and drops out. After nuclear magnetic detection, the conversion rate of glycerin reached 94%. The collected liquid was analyzed and the yield of acrolein was 28%. The reaction system was centrifuged, the supernatant was poured out and recovered by distillation to obtain decahydronaphthalene. The liquid-like substance is dissolved in hot water, filtered, the filter cake is washed 3-5 times, dried, and can be reused as an emulsifier.
Embodiment 3
[0035] Mix 3ml of glycerin, 7ml of water, and 0.8g of concentrated phosphoric acid thoroughly, add 0.2g of titanium dioxide powder with a contact angle of 105°C and 10ml of Fischer-Tropsch wax with a boiling range of 180-200°C, and stir under mechanical stirring at 800 rpm for 30 Minutes to make a uniform water-in-oil emulsion; heat the emulsion to 160°C, and collect the acrolein generated by the reaction until no liquid condenses and drops out. After nuclear magnetic detection, the conversion rate of glycerin reached 90%. The collected liquid was analyzed and the yield of acrolein was 33%. The reaction system was centrifuged, the supernatant was poured out and recovered by distillation to obtain decahydronaphthalene. The liquid-like substance is dissolved in hot water, filtered, the filter cake is washed 3-5 times, dried, and can be reused as an emulsifier.
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