Method for purifying acrolein and treatment system for preparing acrolein

Method for purifying acrolein and treatment system for preparing acrolein

  • CN 102,659,541 B
  • Filed: 04/28/2012
  • Issued: 02/04/2015
  • Est. Priority Date: 04/28/2012
  • Status: Active Grant
First Claim
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1. a purification process for the propenal obtained by atmospheric oxidation propylene, comprising:

  • The synthesis gas containing propenal propylene and air reaction obtained is cooled to 160-180 DEG C;

    Cooled synthesis gas to be introduced at the bottom of the first absorbing tower and to enter deionized water from the first absorbing tower top spray;

    Wherein the tower top temperature on the first absorption tower is 20-50 DEG C;

    Temperature at the bottom of tower is 100-105 DEG C;

    The mixed gas of propenal and non-condensable gases will be obtained after the first absorption tower tower top expellant gas condensation removal water vapour;

    Again mixed gas to be introduced at the bottom of second absorption tower tower and to spray into deionized water from second absorption tower tower top;

    Wherein the tower top temperature of second absorption tower is 5-10 DEG C, and the temperature at the bottom of tower is 45-48 DEG C;

    Organic acid liquid in first absorption tower tower reactor is sent into stripping tower, and wherein use nitrogen or steam carry out the propenal in stripping organic acid liquid;

    The acrolein gas gone out from stripping tower institute stripping is sent at the bottom of second absorption tower tower;

    Liquid wherein in stripping tower tower reactor contains the vinylformic acid of 5-10%, by the raw material being used as synthesis water reducer containing acrylic acid liquid in stripping tower tower reactor;

    Discharge from second absorption tower tower top and burn non-condensable gases;

    Aqueous acrolein solution is collected from second absorption tower tower reactor;

    Aqueous acrolein solution is sent into rectifying tower;

    Water in tower bottom of rectifying tower is sent into second absorption tower tower top and absorbs acrolein gas;

    From rectifying tower overhead collection acrolein gas;

    AndThe acrolein gas collected is through cooling obtained propenal liquid, and this propenal liquid is directly sent into methylthio group and produced methylthio group for propionic aldehyde in propionic aldehyde synthesis reactor.

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