Synthetic method of anionic polyacrylamide

Abstract

The invention relates to a synthetic method of anionic polyacrylamide, which comprises the steps of adding distilled water, an acrylamide monomer, an acrylic monomer and sodium hydroxide powder to a reaction device in sequence, stirring uniformly until completely dissolving to form a monomer aqueous solution, adding appropriate solubilizer, chelating agent and initiator to the monomer aqueous solution, stirring uniformly, filling high-purity nitrogen into the reaction device, exhausting air in the reaction device, sealing the reaction device, placing in an ultraviolet light reaction device, initiating a polymerization reaction under the irradiation of ultraviolet light with certain wavelength, generating an anionic polyacrylamide colloid, purifying, washing and refining the colloid, drying in a vacuum drying oven, grinding, and obtaining anionic polyacrylamide. The method is simple in process, short in production cycle and few in procedure; the polymerization reaction is more stable, and easy to control; prepared polyacrylamide is large in molecular weight, high in conversion rate and solid content, good in dissolvability, and stable; and anionic polyacrylamide is high in DEHP (Di-2-Ethyl Hexyl Phthalate) removal rate.

Description

technical field [0001] The invention relates to a method for synthesizing an anionic polyacrylamide. The anionic polyacrylamide is applied to remove DEHP, a characteristic organic compound in micropollution source water. [0002] Background technique [0003] In recent years, the deterioration of water quality has led to many waterworks being forced to use slightly polluted source water to produce tap water. Slightly polluted source water means that some indicators of source water exceed the limit value of Class III water body in the "Environmental Quality Standards for Surface Water" (GB 3838-2002). The main indicators include NH-N, COD Mn 、COD Cr and BOD 5 etc.; the second means that the source water is polluted by trace organic substances, which are potentially harmful to the human body. These organic pollutants are of many types and complex in nature, but the mass concentration is relatively low (usually in the ug / L~mg / L level), so Traditional water treatment agen...

AI Technical Summary

Problems solved by technology

Their main disadvantages are: 1. The polymerization time is too long, such as the patent "Preparation Method of Polymer Anionic Polyacrylamide" whose publication number is CN 1746198A, anionic polyacrylamide is prepared by adiabatic polymerization, and the polymerization time is 2h~6h , the polymerization time is longer; 2. There are many kinds of additives, which are difficult to control

For example, the publication number is CN 101157736A patent "a method for preparing high molecular weight anionic polyacrylamide by ultra-low temperature initiation". Anionic polyacrylamide is prepared by ultra-low temperature initiation, and the oxidizing agent is potassium persulfate or sodium persulfate or potassium persulfate; reducing agent It is sodium sulfite, potassium sulfite, potassium sulfite, sodium bisulfite, sodium metabisulfite or potassium metabisulfite; the water-soluble azo initiator is 2, 2'-azo(2-mimidylpropane) dihydrochloride , 2, 2'-Azo[2-(2-imidazolin-2-yl)propane] dihydrochloride and 2, 2'-Azo[2-methyl-N-(2-methacrylic acid) Acrylamide], the initiation temperature is controlled at 0-5°C, and the hydrolysis temperature is 85-105°C, which makes the method difficult to control