SIMPLE METHOD AND SYSTEM FOR EFFICIENT RECYCLING OF MOTHER SOLUTION FROM APPARATUS FOR PRODUCING PURIFIED TEREPHTHALIC ACID Russian patent published in 2013 - IPC C07C51/42 C07C63/26 

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method for efficient recycling of a refinery mother solution from apparatus for producing purified terephthalic acid PTA, involving the following steps: (1) cooling the refinery mother solution using a heat exchange technique; (2) treating the cooled refinery mother solution by ultrafiltration and recycling the ultrafiltered concentrated solution for an oxidation apparatus; (3) conducting ion-exchange treatment of the filtrate obtained from ultrafiltration: selective adsorption of Co ions and Mn ions in the filtrate, recycling the desorption solution of Co and Mn as a catalyst and subsequent adsorption of metal ions such as Fe ions, Ni ions and Na ions; and (4) using the solution after ion exchange as a heat-absorbing medium at step (1) for exchanging heat with the refinery mother solution, wherein a large portion of the solution is fed into a spray tower drier, and the remaining portion after heat exchange is discarded; the solution which is sprayed in the spray tower drier is recycled in the refinery system. The invention also relates to a system for recycling a refinery mother solution from apparatus for producing purified terephthalic acid PTA, having a heat exchange system, an ultrafiltration system, an ion exchange system and a spray tower drier, wherein the heat exchange system includes a first heat exchange apparatus and a cooling device; the ion exchange system includes a first ion exchange apparatus and a second ion exchange apparatus; the outlet of the heat-dissipating medium from the first heat exchanger is connected to the inlet of the heat-dissipating medium into the cooling device; the outlet of the heat-dissipating medium from the cooling device is connected to the inlet of the ultrafiltration system; the outlet of the filtrate from the ultrafiltration system is connected to the inlet of the first ion exchange apparatus, the outlet of the first ion exchange apparatus is connected to the inlet of the second ion exchange apparatus; the outlet of the second ion exchange apparatus is connected to the inlet of the heat-absorbing medium of the first heat exchanger; and the outlet of the heat-absorbing medium of the first heat exchanger is connected to the pipe of the sprayer of the spray tower drier.

EFFECT: method has the following advantages: considerably simple treatment process; lower capital costs and operating costs; low power consumption; method helps conserve the environment and save energy; more economic advantages.

10 cl, 2 dwg, 1 ex