Method that is a kind of while preparing 1,1,1,2,2- pentachloropropanes and 2,3,3,3- tetrachloropropylenes

Method that is a kind of while preparing 1,1,1,2,2- pentachloropropanes and 2,3,3,3- tetrachloropropylenes

  • CN 104,496,746 B
  • Filed: 12/18/2014
  • Issued: 10/16/2018
  • Est. Priority Date: 12/18/2014
  • Status: Active Grant
First Claim
Patent Images

1. a kind of preparing 1,1,1,2,2- pentachloropropane and 2, the method for 3,3,3- tetrachloropropylenes simultaneously, it is characterised in that including withLower step:

  • (1) monochloro methane and tetrachloro-ethylene are mixed and enters reactor after being preheated to 125 DEG C~155 DEG C, urged in load type metalIt is reacted in the presence of agent, the load type metal catalyst is FeCl3/Al2O3

    MgCl2/TiO2

    MoCl5One in/CKind, the reaction temperature is 160 DEG C~300 DEG C, and reaction pressure is 0.2MPa~0.8MPa, air speed 300h-1~1400h-1,The molar ratio of monochloro methane and tetrachloro-ethylene is 1~10;

    1, obtain reaction product;

    (2) reaction product for obtaining step (1) is detached into the first knockout tower, and tower top isolates by-product HCl, and tower reactor obtainsTower reactor containing 1,1,1,2,2- pentachloropropanes, 2,3,3,3- tetrachloropropylenes and a small amount of unreacted monochloro methane and tetrachloro-ethyleneLiquid;

    (3) tower bottoms for obtaining step (2) is detached into the second knockout tower, and tower top isolates unreacted monochloro methane, towerKettle obtains the tower bottoms containing 1,1,1,2,2- pentachloropropane, 2,3,3,3- tetrachloropropylenes and a small amount of unreacted tetrachloro-ethylene,The isolated monochloro methane of second separation column overhead is recycled to reactor to continue to react;

    (4) tower bottoms that step (3) obtains is entered into adsorption tower and removes unreacted tetrachloro-ethylene, adsorption tower bottom of tower is containedThe product of 1,1,1,2,2- pentachloropropanes, 2,3,3,3- tetrachloropropylenes;

    (5) the obtained product containing 1,1,1,2,2- pentachloropropanes, 2,3,3,3- tetrachloropropylenes of step (4) is entered into thirdKnockout tower detaches, and tower top respectively obtains 2,3,3,3- tetrachloropropylenes and 1,1,1,2,2- pentachloropropane products.

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