SANDWICH-TYPE CuO / NaX ADSORBENTCATALYST TECHNOLOGICAL PARAMETERS IN REMOVAL OF 1-BUTYLACETATE VAPOUR

Abstract

The adsorbent-catalyst CuO / NaX was saturated at an ambient temperature of 21 °C with 1-butylacetate vapour. Depending on the duration of adsorption and initial concentration, different amounts of acetate (from 0.533 mg/g to 4.742 mg/g) were adsorbed on the surface of the catalyst. Thermal regeneration was carried out by raising the temperature of CuO / NaX adsorbent-catalyst up to 350 °C at a maximum rate of 100 °C/min. Because of the desorption process with the increase of temperature in the catalyst bed, small amounts of non-reacted 1- butylacetate were detected in the outgoing gas stream. In order to evaluate the technological parameters of acetate vapour removal, the oxidation degree α was calculated. Despite desorption, the oxidation degree of 1-butylacetate is rather high - from 98.8 to 90.4%, depending on the amount of adsorbate. Experimental data show that the catalytic oxidation of adsorbate begins at 170 °C. At this point, small impurities of carbon monoxide were detected. The amount of formed CO directly depends on the amount of 1-butylacetate adsorbed on the surface of the CuO / NaX adsorbent-catalyst. Also, other intermediate products of 1-butylacetate oxidation, such as 1- butanol, 2-butene, benzene, furane and tetrahydrofurane were found in the outgoing gases. The further increase of temperature leads to a decrease of the amount of acetate in the outgoing stream. Complete catalytic oxidation of 1-butylacetate begins when the temperature of the catalyst bed reaches 290 °C. In such conditions, no intermediate products of catalytic oxidation were found, and the outgoing gases mainly consisted of two target products - CO₂ and H₂O vapour.

http://dx.doi.org/10.5755/j01.ct.57.1-2.547