YÜKSEK DERİŞİMDE FOSFORÖZ ASİTTEN POTASYUM FOSFİT TUZLARI ÜRETİMİNDE REAKTÖR İŞLETİM TÜRÜNÜN ETKİSİ

Abstract

In the production of potassium phosphite salts (monopotassium phosphite and dipotassium phosphite salts) formed as a result of the neutralization reaction of phosphorous acid and potassium hydroxide. Production was carried out with different operating modes, examining the effect of operations on the process and determining the unknown factors related to the reaction, determining the reactor and operating type in which the reaction will be carried out, and the stoichiometric ratio. In order to determine the optimum operating conditions, experiments were carried out by preparing phosphorous acid and potassium hydroxide solutions at different concentrations. To investigate the relationship between the heat released by the reaction and the operating modes, experiments were carried out in semi-batch and batch and continuous operating modes. In order to observe the effect of explosion and splashing that may occur as a result of exothermic reaction and to evaluate the product properties, both acid-on-base and base-on-acid feeding experiments were carried out. No difference was found between the two experimental sets. It has also been shown that the reaction stoichiometry should be done at a molarity ratio of 1:1.5 (acid:base). Instead of a semi-batch reactor system, a tubular reactor has been preferred in a tubular reactor system, which will ensure that the inputs are fed through the reactor at regular intervals, thus preventing sudden explosion, splashing, temperature rise and reaction rate, while at the same time aiming to increase the product efficiency with this feeding method. As a result, the desired pH value of 6.5 was reached, and the product containing potassium and phosphorus at desired concentrations was obtained by controlling the temperature in the reactor.

Keywords

• phosphorous acid
• neutralization reaction
• potassium phosphite salt
• mono and dipotassium phosphite
• reactor type