FR2493726A1 - PROCESS FOR THE CONTROLLED PREPARATION OF SATURATED SOLUTIONS AND DEVICE FOR IMPLEMENTING IT - Google Patents

Abstract

THE INVENTION RELATES TO A PROCESS FOR THE CONTROLLED PREPARATION OF SATURATED SOLUTIONS, CHARACTERIZED IN THAT A MEASURED QUANTITY OF SOLVENT IN AN EXCESS OF SOLID MATERIAL IS INTRODUCED, THEN THE VOLUME OF THE SOLUTION FORMED, THE DIFFERENCE BETWEEN THE SOLUTIONS, ARE MEASURED. TWO VOLUMES BEING REPRESENTATIVE FOR THE QUANTITY OF SOLID DISSOLVED. IT ALSO CONCERNS A DEVICE CHARACTERIZED IN THAT IT INCLUDES A TANK 1 COMPOSED OF A FIRST COMPARTMENT 2 LEAVING THE PASSAGE TO A DUCT 6 FOR THE INTRODUCTION AND EVACUATION OF SOLVENT RESPECTIVELY SOLUTION, IN WHICH IS INSERTED A VOLUMETRIC METER 9 OPERATING IN BOTH DIRECTIONS, AND A SECOND COMPARTMENT 3 CONTAINING THE SOLID TO DISSOLVE 7 AND A COMMUNICATION 5, AT THE LEVEL OF THE RESERVOIR FUND.

Description

The invention relates to a method and a device for

  controlled preparation of a solution of a solid having a good solubility

in the water.

  There are facilities in which the preparation of certain solutions is done automatically by introducing a certain volume of water into a container filled with the solid to dissolve. After the time required for dissolution, the solution that has emerged is

  sucked and injected into the circuit. Where such facilities operate

  Without supervision, eg controlled by an electronic device, with a remote control center, it is necessary to have a means to check that the prepared solution has a suitable concentration, because it must always meet the requirements.

of his job.

  It has been discovered that this goal can be achieved in the case of

  solids which dissolve easily by means of the process and arrangement

according to the invention.

  The device is characterized in that it comprises a reservoir

  see composed of a first compartment extending from the top to the bottom of the tank, of sufficient size to allow passage to a suction duct reaching the area near the bottom of the first compartment and provided with a level sensor. liquid, and a second

  compartment intended to contain the solid to dissolve, a communication

  cation being provided between the first and second compartments

from the bottom of the tank.

  An advantageous embodiment of the present device is represented

  schematically in the single figure of the attached drawing.

  In this drawing, the tank 1 is composed of the first

  Part 2 and the second compartment 3. They are separated by a wall 4

  in which an opening 5 is provided between the two compartments.

  A tube 6 allows to introduce and suck the liquid, in most cases it will be water, which must dissolve the solid (salt) 7 contained in the tank. At its end, located near the bottom of the first compartment, the tube 6 is bent upwards and is provided with a head 8 for injection and suction. The means for transporting the liquids are not represented. At its other end, the tube 6 is preceded by a counter 9 for the volumetric measurement of both the solvent introduced into the device and the solution evacuated by suction. In order to operate the device, the second compartment 3 is filled with the solid material to be dissolved, for example with NaCl, a solvent, for example water, is injected via line 6, the

  The volume is measured and recorded by the Annexer 9. After the time

  For the dissolution, the solution is sucked into the pipe 6, the

  volume is again measured and recorded by the counter 9.

  This volumetric meter may be any known meter capable of measuring volumes of liquid flowing in any direction, and is advantageously a volumetric turbine placed in the solvent stream flowing through the meter, and emitting

  a number of pulses proportional to the volume passing through the counter.

  The volumetric comparison of the volume of solvent introduced with the volume of the aspirated solution makes it possible to determine the rate of dissolution of the solid product 2 to trigger an alarm in the event of too weak a dissolution, disturbing a correct operation of the installation in which is installed the present device

  3 to alert the operator of the lack of product to dissolve.

  By way of example, the preparation of a NaCl solution has been cited above, but it is obvious that the invention can be adapted to any automated and controlled preparation of solutions for

  from solids and appropriate solvents. If necessary, reconciliation

  used for dissolution may be equipped with auxiliary devices such as agitators and / or heating caps to promote good

  dissolution of the solid in question.

Claims (3)

  A process for the preparation of saturated solutions from a solvent and a solid material, in which the amount of   dissolved solids, characterized in that a measured amount   solvent in an excess of solid material, the contact between the solid and the solvent is maintained for a period of time sufficient to obtain the dissolution of the solid, and then the solution formed is discharged.   by measuring its volume, the difference between the volume of solvent introduced   duit and the volume of the evacuated solution being representative for the   amount of solids dissolved.   2. Method according to claim 1, characterized in that   to facilitate the dissolution, heating and / or stirring is carried out during the process. dissolved.   3. Device for implementing the method of claiming   1, characterized in that it comprises a reservoir (1) composed of   a first compartment (2) extending from the top to the bottom of the   see, of sufficient size to allow passage to a conduit (6) for introduction and evacuation of solvent respectively solution, reaching the area near the bottom of the first compartment (2) and in which is inserted a volumetric counter ( 9) operating in   both directions, of introduction and evacuation, and of a second   part (3) intended to contain the solid to be dissolved (7), and a   communication (5) being provided between the first and second compartments   at the bottom of the tank.