Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back The possibility of using the automated refractometry methods and means for measuring the composition of the green liquor in the production of sulphate pulp E.E. MAIOROV, T.A. CHERNYAK, A.Ch. MASHEK, G.A. TSYGANKOVA, M.V. KHOKHL OVA, A.V. KURLOV, D.I. KIRIK, D.D. KAPRALOV, T.V. ZHARKOVA In the present work the possibility of controlling the total alkalinity in the green liquor solutions developed automated refractometric device submersible type is revealed. The quantitative data on optical properties of the controlled medium in the sulphate pulp green liquors: the refractive index n and its temperature coefficient dn/dt, the total alkalinity to C = 150 g/l in the green liquors at temperatures up to t = 90°C and above are obtained. The metrological capabilities of photometry and particularly spectrophotometry in the ultraviolet region of the spectrum with regard to the definition of total alkalinity and component composition of the green liquor, where the absorption due to the optical transitions between the electronic states in the mineral components, forming the liquors are researched. The dependences of the refractive index n of the density d and measure the total alkalinity C solutions green liquor, the temperature dependence of the refractive index n aqueous green liquor with total alkalinity C, the dependence of the optical density of the solutions are green liquor D at λ = 273 nm from the refractive index n and the total alkalinity C, and ultraviolet spectra of transmittance T(λ) of the green liquor with total alkalinity C are received. The production tests of the device, which showed that, if the total alkalinity and the density of the solution C = 105 ÷ 145 g/l and d = 1149 ÷ 1195 g/dm3 the largest discrepancy in the total alkalinity amounted to ΔC = 7 g/l, which fully meet the requirements of production control are conducted. Keywords: refractometer, green liquor, causticity, refractive index, spectrum, optical density, interpolation. Contacts: E-mail: majorov_ee@mail.ru Pp. 42-49.