Method for producing dichlorohydrin through glycerol chlorination
A technology of dichloropropanol and glycerin, which is applied in the direction of chemical instruments and methods, organic chemistry, catalyst carriers, etc., can solve the problems of poor selectivity and difficulty in catalyst recovery, achieve low energy consumption and cost, and be suitable for industrial production and use. Good catalytic stability
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Embodiment 1
[0026] The method for preparing dichloropropanol by chlorination of glycerol described in this example comprises the following steps: take 100 kg of glycerin and 0.2 kg of an active catalyst and mix them in a reactor, and control the temperature of the reaction system to 80° C., and then 60mL·min -1 The flow rate is passed into excess HCl gas to carry out the chlorination reaction for 5h, and after the tail gas is condensed, it is absorbed by NaOH solution to remove unreacted HCl. After the reaction is over, the product is filtered to recover the active catalyst. After washing, drying and activation, for recycling.
[0027] In the method of the present embodiment, described active catalyst uses Co 2 o 3 · MnO 2 · Fe 2 o 3 As the active component, with Zn(NO 3 ) 2 It is an active auxiliary agent, and it is prepared by dipping and coating on the surface of cordierite ceramic balls in the form of slurry. The specific preparation steps include:
[0028] (1) Take 390g cobal...
Embodiment 2
[0032] The method for preparing dichloropropanol by chlorination of glycerol described in this example comprises the following steps: take 100 kg of glycerin and 0.05 kg of an active catalyst and mix them in a reactor, and control the temperature of the reaction system to 70° C., then 50mL·min -1 The flow of excess HCl gas is passed through for chlorination reaction for 5-8h, and the tail gas is condensed and absorbed by NaOH solution to remove unreacted HCl. After the reaction, the product is filtered to recover the active catalyst, washed, dried and activated. After that, it is recycled.
[0033] In the method of the present embodiment, described active catalyst uses Co 2 o 3 · MnO 2 · Fe 2 o 3 As the active component, with Zn(NO 3 ) 2 It is an active auxiliary agent, and it is prepared by dipping and coating on the surface of activated alumina in the form of slurry. The specific preparation steps include:
[0034] (1) Take 78g cobalt nitrate hexahydrate (equivalent to...
Embodiment 3
[0038] The method for preparing dichloropropanol by chlorination of glycerol described in this example comprises the following steps: take 100 kg of glycerin and 0.1 kg of an active catalyst and mix them in a reactor, and control the temperature of the reaction system to 60° C., and then 80mL·min -1 The flow of excess HCl gas is passed through for chlorination reaction for 5-8h, and the tail gas is condensed and absorbed by NaOH solution to remove unreacted HCl. After the reaction, the product is filtered to recover the active catalyst, washed, dried and activated. After that, it is recycled.
[0039] In the method of the present embodiment, described active catalyst uses Co 2 o 3 · MnO 2 · Fe 2 o 3 As the active component, with Zn(NO 3 ) 2 It is an active auxiliary agent, and it is prepared by dipping and coating on the surface of cordierite honeycomb ceramics in the form of slurry. The specific preparation steps include:
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