A waterborne polyacrylate colloid with hard core and soft shell structure was synthesized with methyl methacrylate (MMA), styrene (St), butyl acrylate (BA), methacrylic acid (MAA) as monomers, diacetone acrylamide (DAAM) as crosslinking monomer and adipic acid dihydrazide (ADH) as crosslinking agent. By adjusting the glass transition temperature (T_g), the emulsion can be self?forming film without adding film forming additive at room temperature. The influence of DAAM?ADH crosslinking system on the properties of latex films was investigated. DSC and TGA analysis showed that the T_g and thermal stability of crosslinked latex films are higher than those of uncrosslinked films. When the mass ratio of DAAM in core?shell is 1∶2, the comprehensive performance of latex films is better than that distributed in core or shell alone. With the increase of DAAM content, the water absorption decreased from 18.99% to 4.38%, and the Gel Fraction increased from 79.30% to 90.84%. When the molar ratio of ADH/DAAM is 1.25, the water absorption reaches the lowest and the Gel Fraction reaches the maximum.

This paper uses Aspen Plus software to carry out steady?state simulations of a new process for the reactive distillation of hydrogen peroxide isopropylbenzene (CHP) and subsequent refining processes for phenol and acetone. The operating pressure, feed position and number of plates of the reactive distillation column and the refining process were economically optimised with the objective of minimising the total annual cost (C_TAC). The results show that the optimal operating parameters of the process are as follows : the total number of trays of RD was 34, the number of trays in the distillation section was 27, the number of trays in the reaction section was 6, the feed position was 28, and the operating pressure was 3.0×10⁴ Pa. The total plate numbers of acetone refining tower (T101), cumene top tower (T102), tar tower (T103) and phenol refining tower (T104) were 25, 61, 23 and 22, respectively. The feed positions are 16, 45, 9 and 9, respectively. The operating pressures were 5.2×10⁴, 5.0×10³, 5.5×10⁴, 6.0×10³ Pa. The minimum C_TAC of the new process was 2 239.03×10⁴ yuan/year. At the same time, the steady?state simulation and economic optimization of the traditional CHP decomposition and subsequent phenol and acetone refining process were also carried out, and the minimum C_TAC value was 2 608.13×10⁴ yuan/year. By comparing the reactive distillation process with the traditional process, it can be seen that C_TAC can save 14.15% and energy consumption can save 9.01%.

TiO₂/Fe₂O₃ nanocomposites with different morphologies were prepared by precipitation separation method combined with sol?gel method using Fe(NO₃)₃?9H₂O and tetrabutyl titanate as iron and titanium sources, and HF, HAc, NH₄F, NH₃?H₂O, H₂O₂ as morphology control agents, respectively. The structure and morphology of the TiO₂/Fe₂O₃ samples were characterized by X?ray powder diffraction (XRD) and field emission scanning electron microscope (FESEM), and the degradation performance of the TiO₂/Fe₂O₃ nanocomposites for methylene blue under UV?light irradiation condition was investigated. The results show that the NH₃?H₂O?TiO₂/Fe₂O₃ nanocomposites prepared with NH₃?H₂O as the morphology control agent have the best degradation effect on MB, with a degradation rate of 82.9%, which is approximately 1.00, 1.10, 1.14, 1.15, 1.56, 3.57, 12.95 times larger than that of HF?TiO₂/Fe₂O₃ (82.5%), H₂O₂?TiO₂/Fe₂O₃ (75.7%), NH₄F?TiO₂/Fe₂O₃ (72.9%), HAc?TiO₂/Fe₂O₃ (71.8%), TiO₂ (53.1%), Fe₂O₃ (23.1%) and blank (6.4%) samples, respectively. This is attributed to the synergistic effect of its large specific surface area, spindle morphology, highest crystallinity and suitable heterojunction structure.

In order to explore the microscopic mechanism of wax deposition on the pipe wall of high temperature and high?pressure condensate gas wells, this paper uses molecular dynamics simulation technology by the Materials Studio to build condensate oil system with methane, pentane, nonane,n?dodecane, cyclobutane, cyclopentane, benzene and toluene,and the wax component model was built with n?octadecane, and simulate with wax content, asphaltene and scale as variables. The results show that with the increase of wax and asphaltene mass fraction, the wall wax deposition behavior can be intensified, but when the asphalt mass fraction reaches 2.0%,the wall wax deposition behavior can be inhibited.The more kinds of heteroatoms in asphaltene,the more obvious the promotion effect.When there is scale on the pipe wall, sulfate scale has a great influence on wax deposition.The understanding of microscopic mechanism provides a scientific basis for the treatment of wax deposition on the pipe wall.