Absorption of Nitrogen Oxides in Columns Equipped with Low-Pressure Drops Structured Packings

Abstract

The absorption of nitrogen oxides was investigated experimentally in a column equipped with HelieR structured packing for different values of operative conditions (NO x inlet concentration, specific gas, and liquid flow rate). The experimental data were compared with the absorption efficiency predicted by three models, the first obtained by the open literature and the others developed in this work. Some conclusions about the relative importance of the different masstransfer mechanisms involving the absorption process were deduced.

Study on the Simultaneous Removal of SO₂ and NO by I₂ Solution

“…Mechanism.The mechanism of SO 2 and NO removal in the bubbling reactor involves numerouse parallel and consecutive reactions. From the results of ion chromatograph,it was found that the samples from reactor included SO 3 2 ‾, I -, SO 4 2 ‾, NO 2 ‾, NO 3 ‾and few HSO 3 ‾,It is assumed that, in acidic medium I 2 mainly works as agent to oxidize SO 2 into SO 3 ,and oxidize NO into NO 2 ,Further absorption of NO 2 is believed to take place hydrolysis of N 2 O 3 or N 2 O 4 [6,7]. The oxidative absorption of SO 2 can be expressed as:…”

Selective oxidative upgrade of waste polystyrene plastics by nitric acid to produce benzoic acid

“…Some mature and efficient technologies have been developed to absorb nitrogen oxide by water, dilute nitric acid, ionic liquids, or activated carbon to prepare nitric acid again. [75][76][77] Therefore, our method of oxidative upgrading of waste polystyrene plastics by nitric acid has high feasibility in practical applications (Fig. 14).…”

Role of nitrous acid decomposition in absorber and bleacher in nitric acid plant

“…Considerable modeling of various pieces of equipment of a nitric acid plant has been carried out and a modeling, simulation and optimization strategy has been proposed in a recent work by Chatterjee and Joshi [7]. In this work as well as practically by all the studies reported in the published literature [8][9][10][11][12][13][14][15][16][17][18], the depletion of aqueous nitrous acid in the absorber and the bleacher in a nitric acid plant has not been adequately modeled.…”