SU710570A1

SU710570A1 - Method of regenerating ionites

Info

Publication number: SU710570A1
Application number: SU762429029A
Authority: SU
Inventors: Александр Маркович Когановский; Евгений Петрович Буравлев; Сергей Васильевич Дроздович
Original assignee: Институт Коллоидной Химии И Химии Воды Ан Украинской Сср
Priority date: 1976-12-14
Filing date: 1976-12-14
Publication date: 1980-01-25

Description

(54) СПОСОБ РЕГЕНЕРАЦИИ ИОЧИТОВ(54) METHOD FOR REGULATING IOCCHITES

Изобретение относитс к способам регенерации ионитов и может быть использовано при очистке сточных вод н Н-катионитовых фильтрах.The invention relates to methods for the regeneration of ion exchangers and can be used in wastewater treatment and H-cationite filters.

Известен способ регенерации катионообменных ионитов раствором азотной кислоты 1.A known method of regeneration of cation-exchange ion exchangers with a solution of nitric acid 1.

Наиболее близким вл етс способ, включающий последовательное пропускание через слой ионита раствора электролита 2 . В качестве электролита используют 4 н. раствор сол ной кислоты . Раствор электролита пропускают через ионит трем порци ми с последующим сбросом первой порции в канализацию и повторным использованием двух оставигахс в цикле.The closest is a method that involves sequentially passing an electrolyte solution 2 through a layer of an ion exchanger. The electrolyte used is 4 n. hydrochloric acid solution. The electrolyte solution is passed through the ionite in three portions with the subsequent discharge of the first portion into the sewage system and repeated use of the two left in the cycle.

Недостаток известных способов высока степень механического износа смолы во врем регенерации. При использовании 4 н. раствора сол ной кислоты разрушение ионита после 100 циклов регенерации составл ет 10%. При увеличении концентрации кислоты до 5-7 н. разрушение смолы после 100 циклов регенерации составл ет 50-70%.A disadvantage of the known methods is a high degree of mechanical wear of the resin during regeneration. When using 4 n. hydrochloric acid solution destruction of ion exchanger after 100 regeneration cycles is 10%. With increasing acid concentration up to 5-7 n. destruction of the resin after 100 regeneration cycles is 50-70%.

Цель изобретени - уменьшение механического износа ионита.The purpose of the invention is to reduce the mechanical wear of the ion exchanger.

Цель достигаетс тем, что через слой ионита последовательно пропускают несколько порций раствора электролита, причем в начале и в конце процесса регенерации раствор электролита пропускают в 2-4 раза менее; концентрированного основной, средней порции электролита.The goal is achieved by the fact that several portions of electrolyte solution are successively passed through the ionite layer, and at the beginning and at the end of the regeneration process the electrolyte solution is passed 2-4 times less; concentrated main, middle portion of electrolyte.

Отличительными признаками способа Distinctive features of the method

0 вл етс то, что раствор электролита пропускают с измен ющейс концентрацией , пропуска через слой ионита раствор с концентрацией 1,1-3,5 3,5 г-экв/л, затем 4,0-8,0 Г-экв/л 0 is that the electrolyte solution is passed with a varying concentration; a solution with a concentration of 1.1-3.5 3.5 g-eq / l, then 4.0-8.0 G-eq / l passes through the layer of ion exchange resin

5 . и 1 ,1-3,5 г-экв/л с выдержкой в течение 9-11 с на каждом слое.five . and 1, 1-3.5 g-eq / l, aged for 9-11 s on each layer.

Устойчивость ионообменного материала зависит от интенсивности изме0 нени его объема, что в свою очередь зависит от концентрации регенерационного раствора, вводимого в ионит в единицу времени. При интенсивности изменени объема пор дка 24 The stability of the ion-exchange material depends on the intensity of the change in its volume, which in turn depends on the concentration of the regeneration solution introduced into the ion exchanger per unit time. When the volume changes in the order of 24

Claims

5 10, which corresponds to the concentration of the regeneration solution of more than 4 g-eq / l, there is a significant destruction of ionites. When using the first and last portion of the regeneration solution is 24 times less concentrated than the middle portion, the destruction of the ion exchanger occurs much slower. The effect of varying the concentration of different portions of the regenerating solution on the degree of mechanical destruction of the ion exchanger is shown in table 0.51 24 14 2.55 1.255 36 1.572, 8 To carry out the method, three portions of nitric acid are passed through the spent ionite, and and the third portion is 2--4 times less than the concentration of the acid of the middle portion. After 40 mlnite placed in a column with a diameter of 25 after purification of waters containing calcium, magnesium, and sodium, nitric acid with a concentration of 2.5 gq / l is passed through for 10 seconds, then for 10 s with a concentration of 5 g eq / l and again for 10 s with a concentration of 2.5 gq-eq / l. The regeneration rate is 100%. After 100 cycles of sorption regeneration, the destruction of the ion exchanger is 7.3%. The advantage of this method is to reduce the mechanical wear of the ion exchanger, thereby reducing the cost of ion exchange treatment of water. The use of more concentrated nitric acid for regeneration than the known methods allows to obtain waste solutions with a concentration of nitric acid salts up to 45%, which can be used as a raw material for the production of granular nitrogen fertilizers. Claims 1. A method of regenerating ion exchangers, which involves sequentially passing an electrolyte solution through an ion exchanger layer, characterized in that, in order to reduce the mechanical wear of an ion exchanger, the electrolyte solution is passed, with a varying concentration, by passing a solution of 1.1-3 , 5 g-eq / l, then 4.0-8.0 g-eq / l and 1.1-3.5 g-eq / l with a holding time of 9-11 seconds. on each layer. Sources of information taken into account in the examination 1. USSR author's certificate number 365326, cl. C 02 B 1/18, 1969.

2.Samborsky I.V., Kas Nenko E.I. Save regenerating agents and wash-off water in the process of ion exchange. Sat . Theory and practice of sorption processes, vol. 72, v.3.1969, pp. 113-115 (prototype).