Continuous Separation of an H₂SO₄/CuSO₄ Mixture by Diffusion Dialysis

Abstract

The separation of a mixture of sulfuric acid and copper sulfate is experimentally investigated in a two-compartment countercurrent dialyzer at steady state using an anion-exchange membrane. The dialysis process is characterized by the recovery yield of acid, the rejection coefficient of salt, and the permeability coefficient of the membrane. The simultaneous transport of sulfuric acid and copper sulfate is quantified by four phenomenological coefficients, which are dependent on the acid and salt concentrations in the feed. They are determined by a procedure consisting of (i) the numerical integration of the basic differential equations describing the concentration profiles of both components on both sides of the membrane and (ii) the optimizing method.

Diffusion dialysis for the treatment of H2SO4-CuSO4 solutions from electroplating plants: Ions membrane transport characterization and modelling

“…However, the separation of H2SO4 from its corresponding copper salt has not drawn much attention. It has been studied utilizing mainly Neosepta membranes both in a two compartment batch cell continuously stirred [22,23] and in a continuous operation mode [24,25]. A good separation of the acid was reached with Neosepta AFN membrane (H2SO4 recovery between 65 % and 90 % and Cu 2+ rejection from 70 % and 98 %) [22,24,25].…”

Effect of novel polysiloxane functionalized poly(AMPS-co-CEA) membranes for base recovery from alkaline waste solutions via diffusion dialysis

“…[15][16][17] The exceptional features of DD process are lower energy intake, simple construction of the apparatus, no pollution, continuous operation and recoverable alkali or acid. [18][19][20][21] DD is thus considered to be the most favorable separation technique known till date in which variation in concentration gradient plays the major role as solutes passed through an IEM from higher concentration side to the lower one. 8,22,23 By this process, base recovery from aqueous waste solution was done so efficiently and has been reported in several literatures.…”

Continuous dialysis of sulphuric acid and sodium sulphate mixture

“…The model developed considers also the mass transfer resistances in liquid films on both the sides of the membrane. The same or slightly modified approach was also used in the papers dealing with the separation of sulphuric acid and nickel sulphate [21], sulphuric acid and cupric sulphate [22], and sulphuric acid and zinc sulphate [23].…”

“…Dialysis and diffusion dialysis, which belong to the group of membrane separation processes, can be investigated in a batch cell [1][2][3][4][5][6][7][8][9][10][11][12][13][14] or in continuous dialyzer [15][16][17][18][19][20][21][22][23]. In the former case, characteristics of the dialysis process are determined from liquid volumes and time dependences of the component concentrations in the individual compartments, while in the latter case the determination of the characteristics is based on the concentrations and volumetric liquid flow rates of all streams at steady state.…”