High Molecular Weight Salt Polyacrylamide Industrialized Production Technology Research

The aim of research on high MW salt-resisting PAM is to meet the request of tertiary oil drilling in Daqing Oil Field. We find that the effect of polymer made by wastewater is equal to that one made by clean water. At the same time the cost of polymer injection is reduced and the output of oil is apparently increased (meanwhile the content of water in oil is reduced too). The success of this research is very significant. It not only updates Daqing Refining and Chemical Company' s technology of making polymer, but also solves the problem of wastewater drainage, thus saves lots of money on drainage of wastewater and reduces the costs on clean water consuming. Its meaning is significant.By researching on three-stage complex initiating system, control and utilize of heat released by heat-insulating polymerization, we fully employ polymerizing heat released from insulating polymerization, initiate polymerization by three stages, thus the initial temperature of polymerization is decreased, which leads to the lower and stable concentration of free groups among reactive system. The speed and temperature of polymerization can be effectively controlled, and then every stage of polymerization can be carried on under lower speed and smooth status. Our research effectively increases the length of molecular chain, which means to improve the viscosity of polymer water solution by increasing MW; in the course of polymerization, we introduce monomer with salt-resisting function, which can increase hydrodynamics dimension by enhancing the rigidity of polymer MW, therefore the salt-resisting ability of polymer is increased. Synthetic high MW salt-resisting PAM can still keep higher viscosity both in low concentration water solution and high-mineralized degree water solution, at the same time the oil-drilling effect of salt-resisting PAM made by wastewater is the same with clean water. All of its quality standards have been in accordance with the request of salt-resisting PAM for oil drilling.In the research, we analyze the advantages and disadvantages of different polymerizing technologies, and evaluate many factors on MW, viscosity and solubility. We also further discuss the polymeric mechanism of super highMW PAM, initiating system and polymerizing conditions. After optimization of polymerizing conditions, we successfully develop the synthetic technology of high MW salt-resisting PAM. By researching on hydrolysis technology line of AM with salt-resisting monomer, we realize large-scale industrialized production of 12ton/kettle. After overcoming the problem of high temperature in large bulk kettle polymerization, fast reaction speed, uneasy control and etc, we solve the key contradiction of increasing product MW while with awful solution in the former PAM production, industrialize super-high MW salt-resisting PAM product with its MW over 30 million and good solubility. Result reveals that the synthetic technology of high MW salt-resisting PAM is successful. Research gets to the anticipative goal. From research of polymerization in lab, to moderate experimentation, to trial industrialization, we realize large-scale industrialization in the end. Product quality has obtained the request of Daqing oil field salt-resisting polymer, and output has attained planning value. High MW salt-resisting PAM product has been utilized in the field of tertiary oil drilling in Daqing oil field, and the effect of increasing oil decreasing water has remarkably acquired.