Development of distillation scheme of acetic acid with low iodic compounds content
DOI:
https://doi.org/10.15587/1729-4061.2013.19140Keywords:
acetic acid, iodides, distillation, mathematical modeling, scheme, carbonylation, methanol, impuritiesAbstract
The problem of obtaining acetic acid with low content of iodides is considered in the paper. The purpose of the research is to identify ways of the ingress of iodine impurities into commodity acetic acid and to find ways of reduction of the amount of these pollutants to the level no more than 10 p.p.b. The structure of material flows of current production of acetic acid was studied, using the methods of fractional distillation, chromatographic analysis and mathematical modeling. The formation of more than 30 side compounds with a high and low volatility in the system was revealed. Based on the results it was shown that relatively volatile by-products - low-molecular iodine compounds, are formed of the low-volatile iodine compounds, entering the distillation stage from the synthesis unit. The way of reducing the content of iodine-containing impurities in the commodity acetic acid to the level no more than 10 p.p.b was proposed. The synthesis of the advanced technological scheme was carried out. The research results can be used in the design of production of acetic acid by methanol carbonylation.
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