A kind of synthetic method of dimethyl azobisisobutyrate

Abstract

The invention discloses a dimethyl 2,2'-azobis(2-methylpropionate) synthesis method. The dimethyl 2,2'-azobis(2-methylpropionate) synthesis method comprises the following steps: (1) condensing: adding azodiisobutyronitrile, methyl alcohol and isophorone into a reactor, adding a phosphorus trichloride solution to react, centrifuging to obtain an azoimide methyl ether hydrochloride solid material; (2) hydrolyzing: adding pure water into a hydrolysis container, adding the azoimide methyl ether hydrochloride solid material into the hydrolysis container to hydrolyze; (3) splitting a phase: putting the hydrolyzed material liquid into a phase split container, splitting the phase by using a phase transfer agent hexadecyl trimethyl ammonium chloride; (4) recrystallizing; (5) drying. The process route and the raw materials are optimally designed, the raw materials are environmentally friendly and toxic-free, the reaction is stable and easy to control, and the reaction safety is greatly improved; the product separation is more thorough, and the product yield is greatly improved; the wastewater discharge is reduced, and the environmental protection pressure is effectively relieved; the reaction time is short, the energy consumption is low, and the production cost is greatly lowered.

Description

technical field [0001] The invention relates to a method for synthesizing dimethyl azobisisobutyrate, which belongs to the technical field of chemical synthesis. Background technique [0002] The full name of POP is grafted polyether polyol, referred to as grafted polyether. It is a polymer obtained by grafting and copolymerizing compounds containing vinyl monomers in polyether. The polyurethane foam produced by it has a high load-bearing capacity. and good rebound performance. The output of graft polyether in developed countries accounts for more than 1 / 5 of the general polyether. In recent years, my country's demand for POP has been increasing. However, in the production process of POP, the properties of the initiator and its decomposition products will directly affect the production process and product characteristics of the polymer. After the commonly used polymerization initiator azobisisobutyronitrile (AIBN) is decomposed, its product is highly toxic solid tetrameth...

AI Technical Summary

Problems solved by technology

[0006] The two methods in the traditional process have long synthetic routes, and the solvents used are toxic benzene or halogenated aromatic hydrocarbons, which are very harmful to human body and environment

And it needs to feed chlorine gas or hydrogen chloride gas, the reaction is violent and difficult to control, and safety accidents such as kettle leakage often occur. After the hydrolyzed crude product is frozen, a small amount of it dissolves in water and is difficult to recover, and the yield is low; the waste water produced is strongly acidic, and it is difficult to treat it up to the standard Emissions, environmental protection pressure is very high, not suitable for industrial scale production