A new type Mannich base was developed by the reaction of binary copolymer AM/C ₉ synthesized from C ₉ petroleum fractions with acrylamide as raw materials. The effects of reaction time, reaction temperature, pH of solution and ratio of aldehyde were studied. The apparent viscosity of Mannich was characterized by IR spectroscopy and its structure is characterized. Finally, the performance of the product is analyzed. The results show that the optimum reaction conditions were as follows: The reaction time is 4 h, the reaction temperature is 70 ℃, the pH is 9 and the ratio of dimethylamine to formaldehyde was 1.5. The result of infrared spectrum characterization shows that the product has been synthesized. Synthetic Mannich base has higher viscosity, temperature and salt tolerance compared with traditional HPAM.

The corn straw was hydrolyzed by diluted acid via microwave radiation under the conditions of the metal salt ferrous sulfate as catalyst. The effect on the reducing sugar production rate was investigated by the concentration of ferrous sulfate, sulfuric acid content, ratio of liquid to solid, the microwave radiation power, time and pressure. The results show that the product yield can reach 38.5% under the best hydrolysis conditions: ferrous sulfate mass fraction of 3%, sulfuric acid mass fraction of 2%, mass ratio of liquid to solid 15, the microwave radiation power 187.5 W, the microwave radiation time 30 min and the microwave radiation pressure 0.3 MPa. Compared to the method without ferrous sulfate or without microwave radiation, this method shows higher yields by 1.1 and 2.8 times, respectively. 

 

 

 

The structure and reaction path of the doublet \[Si, O, C, P\] radical were explored by density functional theory and ab initio levels. Thirteen isomers connected by 15 interconversion transition states are located at the B3LYP/6-311G(d) level. At the QCISD/6-311G(d) level, one cyclic O-cCSiP5 and two bent isomers OSiCP1 and SiCPO3 are stable isomers. The bonding nature of the three isomers and the reaction path of isomers 1 and 5 were analyzed. The predicted structure and reaction path are expected to be informative for the identification of \[Si, O, C, P\] in the laboratory and space detectation.

The treatment of concentrated wastewater produced in the oil field was studied via self-made oily-water segregator. This laboratory apparatus comprises corrugated plate with pressurized dissolved-air flotation technology. The effects of the oil concentration of wastewater and influent flow on the removal efficiency of oil were mainly investigated. When the temperature is 50 ℃, influent flow rate is 70 L/h, the coalescence plate is coated by the galvanized paint, the removal efficiency of oil is up to 86.4%.