Abstract
The automated procedure for the monitoring of the adsorption process in the solute-sorbent-solvent system has been elaborated. It uses commercially available instrument CRYSTAF model 200. The application of CRYSTAF enabled monitoring of adsorption of linear polyethylene with weight average molar masses of 2, 14, and 53 kg/mol from 1,2,4-trichlorobenzene onto zeolite SH-300 at temperature as high as 140°C. It is the authors' understanding that this is the first demonstration of an adsorption isotherms for polyethylene. The measurement with the CRYSTAF instrument reduces manual manipulations with dangerous solvents at high temperature and enables automated long-time monitoring of the concentration of the solute in an adsorption system.
Highlights
Adsorption at liquid-solid interfaces plays an important role in both academia and industry
The responses of the infrared detector (IR) detector, which were obtained during the Crystallization analysis fractionation (CRYSTAF) experiments in the system polyethylenezeolite-1,2,4-trichlorobenzene are shown in Figures 2(a)– 2(c)
The first three measured points correspond to the initial concentrations of the polymer in the reactors
Summary
Adsorption at liquid-solid interfaces plays an important role in both academia and industry. In most cases, sampling and measurement are performed manually In such a way, adsorption isotherms of alkanes [8,9,10,11,12], saccharides [13], phenol [14], polymers [7, 15,16,17,18], and peptides [19] in various solvent-sorbent systems have been determined. The instrument enables a fully automated measurement of the dependence of the crystallization behavior of polymers as a function of temperature An advantage of this technique is the automated sampling procedure (i.e., periodical monitoring of the concentration of polymers in several reactors), which reduces manual manipulations with samples and solvents to a minimum. For the first time adsorption isotherms for polyethylene on the zeolite at a temperature of 140◦C are determined
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