Evaluation of the Safety of High-Salt Wastewater Treatment in Coal Chemical Industry Based on the AHP Fuzzy Method

Abstract

Aim. Epichlorohydrin (ECH) is a widely used chemical product. The production of glycerol has its irreplaceable advantages. With the development of biodiesel industry, it will become the main trend of ECH production in the future. Methods. A vacuum evaporation device is built to investigate the effect of evaporation on the treatment of this kind of high-salt wastewater, and the feasibility of the thermodynamic equation of the simulation process is verified. Process. An AHR fuzzy mathematics evaluation algorithm is used to compare experimental values with simulated numerical values in brine. Results and Conclusions. In the multieffect evaporation process simulation with glycerin-containing brine, the amount of salt precipitated by unit steam energy is arranged in order from more to less than that of seven-effect parallel flow evaporation, is greater than five-effect parallel flow evaporation, and is larger than three-effect parallel flow evaporation, which shows that the increase of validity number is beneficial to the utilization of heat.

Analysis on application status of CCUS technology in emission reduction of modern coal chemical project in chemical industry

“…Because the use and demand of ammonia in China's chemical production field are relatively large, it is feasible to use coal resources to process ammonia through the exploration and application of energy-saving and emission-reduction technologies in modern coal chemical industry to support the demand for ammonia in chemical production in other industries. As shown in Figure 1, it is to use coal resources in the field of modern coal chemical industry to process chemical raw materials such as ammonia and methanol, and to carry out advanced treatment of coal tar [3].…”

Salt-Water-Organic Transport Nexus and Mechanisms through Cation Exchange Membranes: Effect of Membrane Sulfonation Degree

“…In order to evaluate the desalination of high salinity organic wastewater, a simulated epichlorohydrin production wastewater was prepared as the feed solution, which contained high organic matter (0.134 M glycerol) and high salt (160 g•L −1 NaCl). 26 Besides, to ensure the experiments on various organic transports were comparable, the feed solutions contained other organic compounds used in this study at 0.134 M. On the other hand, 160 g•L −1 NaCl single salt solution was pumped into the diluate to evaluate the membrane desalination performance. Simultaneously, the concentrate and electrode rinsing solution were fed with 0.5 M NaCl and 0.3 M Na 2 SO 4 solution, respectively.…”