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Simulation And Optimization Of Pyrolysis And Removal Process Of Coal Chemical Industry Wastewater

Posted on:2018-01-16Degree:MasterType:Thesis
Country:ChinaCandidate:Z Y WuFull Text:PDF
GTID:2321330518492986Subject:Chemical engineering
Abstract/Summary:PDF Full Text Request
Wasting water produced during the process of coal chemical industry has much complicated compositions, including not only more than ten inorganic substance, like ammonia salt, sulfur cyanide, sulfides, oxygen heterocyclic compounds but also some kinds of organic compounds and biphenyl. This wasting water has high toxicity, high chroma, large value of COD, also part of the organic substances in the wasting water are difficult to be degraded.Therefore, the wasting water from the process of coal chemical industry is the classical industry wasting water and very difficult to be treatedThe current way of treatment of the wasting water is combining chemical separation and biochemistry. This report was focus on the ammonia distilling and dephenolization processes to treat the wasting water, which was from the comprehensive utilization of coal classification project in the Xinjiang Guanghui Coal Clean Refining & Chemical Co., Ltd with a production of 30,000,000 tons per year. Aspen plus was used to simulate, analyze and optimize the process. The process technology called "deamination,deacidification then dephenolization" was built in the report to meet the biochemistry requirements.According to the characteristic and water quality parameters of coal chemical industry wasting water, NH3-H2S-CO2-NaOH-PhOH-H2O system analyzation was applied to the deamination and deacidificaiton process with the thermodynamics model ElecNRTL. In the dephenolization process, the UNIQUAC model with user-defined and binary interacted parameters was applied to liquid-liquid phase balance in the extraction. The NTRL model was applied to solvent recycle and solvent stripping. The built model was verified by the current process.Based on this model, the rectifying equipment with single-side ammonia stripping was built to achieve deacidification and deamination. By using MBK in the process of extraction dephenolization, the purified water achieved less than 350 mg·L-1 of phenols, less than 100 mg·L- of ammonia, trace acid gas,and less than 50 mg·L-1 of residual extractant. At the same, coarse powder product and concentrated ammonia were produced.The modeling data can be used for analyzing the parameters of the process equipment and be the basis of industrial realization.
Keywords/Search Tags:Coal chemical wastewater, Aspen plus simulation, Extraction of phenol, Stripping ammonia, Methyl nbutyl ketone
PDF Full Text Request
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