DD142503A1 - DEVICE FOR PRODUCING STABLE LIQUID-LIQUID DISPERSIONS - Google Patents

Abstract

Apparatus for producing stable liquid-liquid dispersions according to the principle of high-pressure homogenization, preferably for the production of vinyl chloride in water dispersions whose operation relatively low pressures are necessary, consisting of a preferably movably arranged upper part 1 and a lower part 3, in which the inflow 4, which opens into a nozzle 7, which has a slope of about 45 ° in the flow direction and which is opposite to the downstream turbulence space 8, which has the shape of a discontinuous extension, terminated with a sharp tear-off edge 6, wherein the ratio smallest possible Nozzle diameter 9 to the diameter of the turbulence space 8 0.3 to 0.6 and the depth of the turbulence chamber 8 are 3 to 6 times the smallest possible nozzle diameter. With the device according to the invention, values <0.1 can be achieved at pressures <10 bar Omikron and Rho. - Fig.2 -

Description

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Title of the invention

Device for producing stable liquid-liquid dispersions

Field of application of the invention

The invention relates to a device for producing stable liquid-liquid dispersions according to the principle of high-pressure _{homogenization,} preferably for the production of vinyl chloride in water dispersions.

"known .tec ^ huiscliep solutions

For the preparation of liquid-liquid dispersions according to the principle of high-pressure homogenization, a device is known, which consists of a, movably arranged stamp, which is associated with a lower part, which contains the inflow channel. Between the movable punch and lower part there is a gap, which may possibly be surrounded by a baffle ring * The device is preceded by a conveying member in which the necessary homogenization pressure is erze.ugt. (L ₀ W * Phipps _f Apple Phys ₀ Vol. 8 (1975) p. 448 ff.)

It is also known to form the punch and base as a flat or conical nozzle, wherein a deflection of the liquid jet by 9o ° or * 9o ° takes place «

The abovementioned devices have the disadvantage that it is necessary to work for a sufficient homogenizing effect with small gap widths between the punch and the lower part. In order to homogenize a liquid mixture, pressures up to 80 ° C. are necessary.

The technical and economic effort required to produce such high pressures is therefore correspondingly high. If the gap width is increased, the homogenization pressure and thus the homogenization effect decrease, in which case homogenization in the particle size range of o, 3 to 3, o / im is not possible,

Zig.1 _dejg Er fi

It is the object of the invention to enable the preparation of stable liquid-liquid dispersions by means of a Homogenisleitvorrichtung, in the operation of the technical and energy expenditure is reduced *

Explanation of the essence of the invention

- The technical problem which is solved by the invention The invention has for its object to provide a device for preparing stable liquid-liquid dispersions, preferably of vinyl chloride in water dispersions, to their relatively low operating homogenization pressures are needed *

Features of the invention

The object is achieved by a device consisting of a preferably movably arranged upper part 1 and a lower part 3 in which the inflow 4, which opens into a nozzle 7, which has a slope of ca «, 45 ° in the flow direction and the with respect to the near-top turbulence space 8, which has the shape of a discontinuous extension is completed with a sharp tear edge 6, wherein the ratio smallest possible nozzle diameter 9 sum diameter of the turbulence space 8 o, 3 to o, 6 and the depth of the turbulence space 8, the 3 bis 6 times the smallest possible diameter «,

The homogenization is carried out by the emerging from a pump with a corresponding pressure and to be dispersed mixture via the Einströiakanal 4 of the lower part 3 ^; the nozzle 7 is fed »From the nozzle 7, the liquid mixture enters via the sharp tear-off edge 6 in the turbulence space 8, where the homogenization takes place *

The invention will be explained in more detail with reference to the following examples.

Fig. 1 seizes the section of the prior art

corresponding homogen is j.ervorrichtung Fig. 2 seige the section through the device according to the invention.

Example] - 1. '·

To illustrate the technical effect of the device according to the invention, the value of the logarithmic normal distribution 6j ₎ which can be calculated using the following formula is used;

A device was used which had the following technical data?

Ring nozzle with an annular gap 9 of ο, 2 mm diameter inflow channel 4 14 mm height of the turbulence chamber 8 ο, 2 mm depth of the turbulence chamber 8 l, o mm The delivery rate of the mixture to be dispersed (vinyl chloride: water = 4o: 6o)

scam . 4 ·, 25 m ³ / h

The pressure loss was 8, ο bar Under the specified conditions, a G o «value of 0.08 was reached.

For comparison, a prior art device having the following technical parameters was used.

Gap height ο, 2 min ·

Gap length 6 mm

Diameter inflow channel 16 mm diameter of the punch 28 mm The delivery rate of the mixture to be dispersed and its composition as in Example I ₆ The pressure loss was 8o bar.

Under the given condition an (^ value of ο, 19 has been reached »

Claims (1)

He fin d ungsa nSpruch Device for producing stable liquid-liquid dispersions according to the principle of high-pressure homogenization, preferably for the production of vinyl chloride in water dispersions, consisting of a preferably movably arranged upper part (1) and a lower part (3) in which the inflow channel (4) is located, characterized in that the inflow channel (4) opens into a nozzle (7), which in the flow direction a slope of about 4 ^ ° aufv / eist and with respect to the downstream turbulence space (8), which has the shape of a discontinuous extension with a sharp Abreißkante .. (6) is completed, wherein the ratio of smallest possible nozzle diameter (9) to the diameter of the turbulence space (8) o, 3 to o, 6 and the depth of the turbulence space (8) 3 to 6 times the smallest possible diameter. For this 1 rope drawings