Effect of PBT impeller position on ion exchange : diploma thesis

Ovaj rad predstavlja dio istraživanja koja se odnose na analizu utjecaja parametara miješanja na ionsku izmjenu. U ovom radu sagledan je utjecaj pozicije turbinskog miješala s ravnim lopaticama nagnutim pod kutem od 45⁰ (tzv. PBT miješalo) na ionsku izmjenu bakra na sintetskom zeolitu NaXu neprotočnom kotlastom reaktoru. Ispitao se utjecaj pozicije PBT miješala na suspendiranje čestica zeolita NaX i utrošak snage miješanja kod stanja potpune suspenzije. Omjer udaljenosti miješala od dna posude (C) i visine stupca kapljevine (H) u različitim eksperimentima je iznosio 0.10, 0.33 i 0.50. Ispitao se i utjecaj pozicije miješala na kinetiku ionske izmjene pri stanju potpune suspenzije. Eksperiment su provedeni pri stalnoj temperaturi od 300 K u suspenziji volumena od 2.14 dm 3 u kojoj krutu fazu predstavlja 10.5 g zeolita NaX veličine čestica 0.063-0.09 mm, a kapljevitu otopina bakrovog (II) nitrata. Iz dobivenih kinetičkih podataka uočava se kako je proces izmjene iona brz u početnom periodu nakon čega usporava do uspostave ravnoteže. Kinetička analiza dobivenih eksperimentalnih podataka provedena je korištenjem dva kinetička modela Ritchievog i Morris-Weberovog modela. Dobiveni rezultati pokazali su dobro slaganje eksperimentalnih podataka s Ritchiev-im modelom.This work presents a part of systematic researches which are related to analysis of the influence of mixing parameters on ion exchange. Focus pf this research was on the influence of diameter of pitched blade turbine (abbrev PBT impeller) on copper exchange on synthetic zeolite NaX in a batch reactor. Influence of PBT impeller position on suspended zeolite particles NaX and mixing power to achieve the complete suspension state was explored. Ratio C/H is the impeller off-bottom clearance (C) to liquid height ratio (H), with the values of C/H= 0.10, 0.33, 0.50. The effect of impeller position was explored on the kinetic of ion exchange at complete suspension. Study was conducted at the constant temperature (300 K), in suspension volume 2.14 dm 3 . Solid phase was 10.50 g zeolite NaX, size 0.063-0.09 mm, and liquid phase is (II) copper nitrate. Kinetic analysis of experimental results found that the ion exchange process is fast in the initial period and then decelerate till equilibrium is reached. For the kinetic analysis Ritchie and Morris-Weber models are used. Ritchie model showed better fit with the experimental data