SU1603243A1 - Diffusion cell - Google Patents

Abstract

The invention relates to the field of instrumentation technology, namely, devices for studying diffusion in highly viscous substances, and can be used to determine the rate of diffusion into liquid substances in the chemical industry. The aim of the invention is to expand the field of application of the device by allowing the study of viscous liquid samples that change the volume during diffusion. For this, a bottom groove with a depth exceeding the height of the specimen is made in the bottom of the cell base. When the sample hardens after contact with the diffusant, the resulting protrusion on the sample jams the gap between the lid and the base during the shrinkage of the sample, preventing the diffusant from entering the gap and the floating of the sample. 3 il.

Description

The invention relates to a measuring and control technique, in particular, to devices that allow analyzing samples of highly viscous solutions that change volumes when interacting with other solutions, for example, determine the rate of acid diffusion into viscose, which will control and control the formation of viscose fibers, filaments and films.

The aim of the invention is to expand the field of application of the device by allowing the study of viscous liquid samples that change the volume during diffusion.

FIG. 1 schematically shows the proposed diffusion cell, top view; in fig. 2 shows section A-A in FIG. 1: in FIG. 3 shows a section BB in FIG. one.

The diffusion cell consists of a base in the form of a cuvette 1 with an inclined bottom 2, on which calibration grooves 3 and an edging groove 4 along the bottom perimeter 2 are made. with sample. The depth of the rim 4 must exceed the maximum depth of cuvette 1, which prevents the ascent of the sample.

The diffusion cell operates as follows.

A sample of the viscose with the indicator inserted into it is poured into the cuvette 1, the excess amount of viscose is removed with a squeegee, and the cuvette 1 is covered with a lid 5. A leakage is formed on the viscose film into the edging groove 4. After this, the diffusion cell is immersed in a precipitation bath with acid, the diffusion of which into viscose must be investigated. When viscose is in contact with an acid, the viscose sample is reduced in volume and is solidified — regenerated. With shrinkage

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of the sample, the edge of the film forming will rest on one side against the cover 5, and on the other against the wall of the edge groove 4, thereby closing the gap, jamming the gap between the cover 5 and the bottom 2 of the cuvette 1. The jamming occurs automatically as the viscose decreases. all directions. And if in the cavity between the lid 5 and the bottom 2 of the cuvette 1, the film shrinks and a gap forms between the walls and the film, into which the acid gets, but due to the shrinkage of the film in a plane parallel to the bottom 2 of the cuvette 1 and the cover 5, and the radial direction, the protrusion on the film sample is drawn into the gap between the bottom 2 of the cuvette 1 and the lid 5, automatically sealing the gap and preventing the penetration of acid from the opposite side of the sample.

The velocity of the moving and color border along the viscose sample is measured from time after the sample is brought into contact with the acid according to the time the images of the graded grooves appear through the thickness of the sample. From the known geometric parameters, the rate of acid penetration into viscose is calculated.

Claims (1)

Invention Formula A diffusion cell containing a base for placing the sample and a cap characterized in that. that in order to enable research viscous liquid samples, their volume changed during diffusion, the base is made in the form of a cuvette with a border groove at the bottom, while the depth of the border groove exceeds the depth of the cuvette. I li / .4. 7-7 7 5 fi-a FIG. 2 Editor Y. Sereda Compiled by A. Koshcheev Tehred M. Morgent V FIG. one Bb Fig.Z Proofreader V.Girn to