Method for separating and purifying cyclododecatriene

Abstract

The invention provides a method for separating and purifying cyclododecatriene. The method comprises the following steps: dissolving a quenching agent in a solvent to prepare a quenching agent solution; mixing the quenching agent solution with a cyclododecatriene reaction solution, quenching in a quenching reactor to obtain a cyclododecatriene crude product; introducing the cyclododecatriene crudeproduct into a chelating resin tower at first, and then making the crude product sequentially pass through a catalyst removal unit, a heavy component removal unit, a solvent removal unit, a quenchingagent removal unit, a light component removal unit and a product refining unit in a distillation tower to obtain a cyclododecatriene product. According to the method, corrosion to equipment is reduced, the danger coefficient is low; the side reaction is reduced, the yield of cyclododecatriene is increased; the stability of CDT and other heat-sensitive substances in the separation process is improved, the purity of cyclododecatriene is improved; insoluble substances in a crude product can be avoided, so that the separation process is continuous, and industrial amplification is easy to realize.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a separation and purification method of cyclododecatriene. Background technique [0002] Cyclododecatriene, English name cyclododecatriene, referred to as CDT, is an important organic chemical intermediate, which is mainly used as a raw material for the synthesis of nylon 12, hexabromododecane, macrocyclic musk and spices. The preparation of cyclododecatriene in the industry is to use butadiene as a raw material and obtain it by reacting under the action of a homogeneous Ziegler-Natta catalyst. After the reaction is completed, the Ziegler-Natta catalyst is Quenching to inactivate it, followed by further isolation and purification. [0003] At present, in the prior art, there are mainly the following methods for quenching Ziegler-Natta catalysts: (1) patent document CN103420777A discloses a method for continuously synthesizing 1,5,9-cyclododecatriene, It adopts sodiu...

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Problems solved by technology

[0003] At present, in the prior art, there are mainly the following methods for quenching Ziegler-Natta catalysts: (1) patent document CN103420777A discloses a method for continuously synthesizing 1,5,9-cyclododecatriene, It adopts sodium hydroxide aqueous solution to quench the catalyst, and the reaction product removes the waste catalyst solid matter and butadiene polymer in the reactant through a thin-film evaporator, and then carries out vacuum distillation in a rectification tower to obtain 1,5,9 -Cyclododecatriene, but because the aluminum insolubles produced by the hydrolysis of alkyl compounds adhere to the thin film evaporator, which seriously affects the separation effect of the equipment and causes equipment failure, which is not conducive to industrial continuous production; and when cleaning the inside of the equipment, Because the catalyst residue at the bottom of the thin film evaporator is exposed to the air, it is easy to catch fire, and the operation risk is high

(2) Patent document CN105693455A discloses: with the methanol solution of sodium methoxide as quenching agent, the reaction solution is at first normal pressure distillation to remove low boiling point substances, then underpressure distillation, obtains cyclododecatriene product; Yet because sodium methoxide has Corrosive and unstable, high requirements for equipment and process operation, so the risk factor is high

(3) U.S. Patent Documen

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