Polyacrylamide (PAM) with Mw of about ten million was modified by Mannich reaction and Hydrolysis to prepare amphoteric polyacrylamide (AMPAM), i. e. PAM was modified with diethyl-amine and formaldehyde into cationic polyacrylamide (CPAM), then CPAM was hydrolyzed with Na2CO3 at 35-45 ℃ for about 2 h into AMPAM with cationcity of 42%, hydrolysis degree of 15% and Mw of over ten million.
The reaction conditions of synthetic powdered cationic polyacrylamide (CPAM) through Non homogeneous Mannich reaction of non ionic polyacrylamide (NPAM) were studied. The relations of swelling capacity and aminating degree of NPAM in the water alcohol medium with swelling time. Volume ratio of water to alcohol and molecular weight of NPAM are discussed.
The selective water plugging agent of cation polyacrylamide is chosen, the core simulation experiment show that, for the cores with different permeability, the water plugging rate is greater than 85% and the oil plugging rate is about 20%.
XN-8807 Oily water flocculant is mainly made up with inorganic high polymer flocculant PACS(polysulphur aluminium chloride) and organic high polymer FIG (modified cation polyacrylamide) and added a little SP type surfactant.
It was investigated that the cationic PAM reaction conditions such as the reaction temperature, dosage of positive ion etherification aid, reaction concentration of acrylic amide monomer, and reaction time etc. It was showed that the best reaction condition was AM monomer reaction concentration 13%~19%, the DMC dosage 15%~25% of AM, the best reaction temperature 25~30 ℃.
The emulsion of waste cutting fluid was broken by HNO3 and then coagulated by PFS and cationic PAM. Under the conditions of pH 7.5,PFS dosage 1 500 mg/L,PAM dosage 8 mg/L,the coagulation effect is good.
This thesis analyzed the background, reaction principium of the polymerization of AM and DMC, and an experiment on the reaction temperature of Cationic PAM was done, and obtained a conclusion that the best reaction temperature was 25~30℃.
91.3% and 69.2% obtained with the commercial cationic polyacrylamide (PAM-C).
The effects of some electrolytes on flocculation with a cationic polyacrylamide
Adsorption of a well-characterized cationic polyacrylamide (CPAM) onto the surface of a model colloid (monodisperse polystyrene latex with carboxylic functional groups) was studied over a wide range of pH (4-9) and KCl concentration (cs=10-3-0.3?M).
Comparison of the performance of chitosan and a cationic polyacrylamide as flocculants of emulsion systems
Sodium taurocholate and Sedipur 400, an anionic polyacrylamide, enhance the negative character of the fatty droplets of substrate and tend to improve the lipolytic activity while the cationic polyacrylamide (Sedipur 900) has opposite effects.