Abstract: A deflection-type refractometer with extended measurement range having a light source generating a beam of light; a measuring cell with a sample chamber receiving a sample liquid; an optical sensor mounted on a movable platform for detecting the deflected beam of light; a driving unit configured to move the platform; a distance measurement unit for monitoring the displacement of the platform; a control unit configured to calculate the deflection of the beam of light based on the displacement of the platform and an output signal of the optical sensor to obtain a refractive index measure of the sample liquid using the calculated deflection.

Abstract: A deflection-type refractometer with extended measurement range having, a light source generating a beam of light; a measuring cell with a sample chamber receiving a sample liquid; an optical sensor mounted on a movable platform for detecting the deflected beam of light; a driving unit configured to move the platform; a distance measurement unit for monitoring the displacement of the platform; a control unit configured to calculate the deflection of the beam of light based on the displacement of the platform and an output signal of the optical sensor to obtain a refractive index measure of the sample liquid using the calculated deflection.

Abstract: The invention relates to a process for separating and/or purifying organic compounds susceptible to crystallization by means of crystallizing and dissolving comprising the following steps: a) depositing the composition in the head of a separation and/or crystallization column; b) crystallizing by means of a cooling gradient; c) pumping the solvent at optimal flow rate Fc; d) entraining the components while they are not crystallized to the end of the column; e) stopping the pumping of the solvent until reaching the lowest temperature of the interval established by the cooling gradient; f) heating the column; g) beginning new pumping by means of applying flow rate Fe; h) collecting the eluates; and i) detecting by means of detectors.

Abstract: The invention relates to a process for separating and/or purifying organic compounds susceptible to crystallization by means of crystallizing and dissolving comprising the following steps: a) depositing the composition in the head of a separation and/or crystallization column; b) crystallizing by means of a cooling gradient; c) pumping the solvent at optimal flow rate Fc; d) entraining the components while they are not crystallized to the end of the column; e) stopping the pumping of the solvent until reaching the lowest temperature of the interval established by the cooling gradient; f) heating the column; g) beginning new pumping by means of applying flow rate Fe; h) collecting the eluates; and i) detecting by means of detectors.

Abstract: The composition distribution of a sample in solution is determined by basing the calculation of the composition distribution on intermittent measurements of the concentration of sample remaining in solution while precipitating the sample from the solution. An apparatus for determining the composition distribution of the sample has a sample solution vessel, a temperature control for raising and lowering the temperature of a solvent within the vessel, and a device for intermittently measuring concentration of sample in solution in the vessel.