Acrylamide production method
Method 1: hydrolysis method
Hydrolysis of acrylamide, its acrylic chain in the macromolecular chain on the distribution is irregular, it accounts for macromolecules on all the chain number of mole percent is the degree of hydrolysis. (HD) is not high, less than 30%, the theoretical HD greater than 70% of the product should be prepared by copolymerization, the method of hydrolysis temperature and events have certain requirements , While the hydrolysis process prone to macromolecule degradation.
Method 2: aqueous solution polymerization
The polymerization reaction is carried out by dissolving the reaction monomer and the initiator in water during the aqueous solution polymerization. The method is simple, low in environmental pollution and high polymer yield, easy to obtain high molecular weight polymer, polyacrylamide industrial production is the first method used, and has been the main method of industrial production of polyacrylamide. The study of aqueous solution polymerization has been more in-depth.
Method 3: Inverse emulsion polymerization
In the reverse phase emulsion polymerization and reverse phase suspension polymerization, a reverse phase colloidal dispersion system is required to form a water / oil (W / 0) heterogeneous dispersion system by means of a stirred dispersion or emulsifier oil phase, The initiator was added for free radical polymerization. General inverse emulsion polymerization using oil-soluble initiator, mostly anionic free radical initiator and non-ionic free radical initiator, and reverse suspension polymerization using water-soluble initiator, such as persulfate. There are two views on the nucleation mechanism of AM / AA inverse emulsion polymerization mechanism: micellar nucleation and monomer droplet nucleation. Its kinetics and typical positive emulsion polymerization kinetics are quite different.
Method 4: Reverse phase suspension polymerization
In the past 10 years, the ideal method for the industrial production of water-soluble polymers was developed in the reverse phase suspension polymerization. In 1982, Di-monie studied AM reversed-phase suspension polymerization by conductivity, NMR and electron microscopy.