METHOD AND SYSTEM OF SEPARATION AND FILTRATION OF UNPROCESSED TEREPHTHALIC ACID FOR OBTAINING PURIFIED TEREPHTHALIC ACID Russian patent published in 2014 - IPC C07C51/42 C07C63/26 B01D33/06 

FIELD: chemistry.

SUBSTANCE: method includes supply of suspension of unpurified terephthalic acid into rotational pressure filter for solid-liquid separation with obtaining wet filtered sediment, filtered residual liquid, washing flowing medium and dehydrated gas, supply of washing flowing medium and inert gas, removal of admixtures from part of filtered residual liquid and recycling remaining filtered residual liquid. Before removal of admixtures from filtered residual liquid all filtered residual liquid is first subjected to gas-liquid separation to separate gas, that it contains. Washing flowing medium and dehydrated gas are also subjected to gas-liquid separation, with wet filtered sediment being supplied to dehumidifier for drying, and gases, formed after gas-liquid separation of filtered residual liquid, washing flowing medium and dehydrated gas are centrally condensed, after which gases, obtained after condensation, are recycled into nitrogen, required for rotational pressure filter, and liquid, obtained after condensation, as well as residual liquid, which has not been subjected to process of admixture removal, are recycled together. Liquids, obtained after respective gas-liquid separation of washing flowing medium and dehydrated gas, are also recycled together with filtered residual liquid, which has not been subjected to process of admixture removal.

EFFECT: method makes it possible to reduce water and energy consumption, reduce working load, connected with admixture removal.

4 cl, 1 dwg