JP2007069167A - Apparatus for preparing primary or secondary dilution of emulsion polymer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for preparing a primary or secondary dilution of an emulsion polymer capable of certainly diluting an emulsion polymer to a desired dilution ratio. <P>SOLUTION: The apparatus for preparing a secondary dilution of an emulsion polymer by diluting its primary dilution equipped with a transfer pump 2 and a static mixer 7 disposed in a transfer line (a) extending from a storage tank 1 of a primary dilution of an emulsion polymer and a secondary dilution water line (b) in communication with the transfer line (a) at the inlet side of the static mixer 7 keeps a bellows tube 9 installed at the outlet side of the static mixer 7 disposed in the transfer line (a). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a diluting apparatus for diluting an emulsion polymer, which is one type of water-soluble polymer electrolyte, with water.

  For example, emulsion polymers have been used in place of conventional powdered polymer polymers as flocculants added to raw water during wastewater agglomeration and sludge dewatering and as a paper pulp yield improver in the papermaking process. . This emulsion polymer contains 20% to 40% of the polymer component in the whole, and is 200 in a diluting device in order to adjust the polymer concentration to 0.01% to 0.1%, for example, when the waste water is coagulated or sludge is dewatered. It is diluted more than twice. The emulsion polymer for papermaking is used by first diluting to about 100 times and secondarily diluting this primary dilution to about 10 times.

By the way, as a diluting device, in addition to the one in which the emulsion polymer is introduced into the agitation tank, the dilution water is injected and the mixture is stirred for a long time for dilution and dissolution, a transfer pump and a static mixer are provided in the transfer line extending from the emulsion polymer storage tank In addition, there is known one in which a dilution water line is connected to the inlet side of the static mixer of the transfer line (see Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 5-169067 Patent No. 2745106

  In the conventional dilution apparatus, the emulsion polymer is dissolved and diluted with the secondary dilution water while passing through the static mixer, but the processing time in the static mixer is as short as about 1 to 2 seconds. Even when the primary dilution of the emulsion polymer is diluted 2 to 10 times with industrial water by setting the number to 24 and the flow rate to 2 m / s, an undispersed gel polymer remains at the outlet of the static mixer. was there. In particular, it was difficult to obtain a uniform dilution as the concentration of the final dilution was higher.

  The present invention has been made in view of the above problems, and its object is to provide a primary or secondary dilution device for an emulsion polymer that can reliably dilute the emulsion polymer to a desired dilution ratio. .

  In order to achieve the above object, the present invention provides a transfer pump and a static mixer in a transfer line extending from an emulsion polymer or a primary diluent storage tank, and a dilution water line is connected to the inlet side of the static mixer in the transfer line. The emulsion polymer primary or secondary dilution apparatus is characterized in that a bellows tube is disposed on the exit side of the static mixer in the transfer line.

  According to the present invention, since the bellows tube is disposed on the outlet side of the static mixer, the emulsion polymer or the primary dilution liquid thereof is diluted in two stages by the static mixer and the bellows tube, but is wound in a spiral shape. A turbulent state is formed in the bellows tube, and the emulsion polymer or its primary dilution and dilution water are gradually mixed by this turbulent state, and the emulsion polymer or its primary dilution becomes a desired dilution ratio as the treatment time elapses. Thus, there is no problem that the polymer is uniformly diluted and undispersed gel polymer remains in the diluted liquid.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a configuration diagram of a secondary dilution apparatus according to the present invention, in which 1 is a primary dilution storage tank for storing a primary dilution liquid of an emulsion polymer therein, and a transfer extending from the storage tank 1 The line a is provided with a transfer pump 2, a flow rate adjusting valve 3, a check valve 4, a flow meter 5, a pressure gauge 6, a static mixer 7, a pressure gauge 8, and a bellows tube 9 in this order from upstream to downstream. ing.

  A secondary dilution water line b extending from a dilution water supply source (not shown) is connected to the inlet side of the static mixer 7 in the transfer line a. Valve 10, check valve 11 and flow meter 12 are provided.

  Thus, the secondary diluting device according to the present invention is characterized in that the bellows tube 9 is disposed on the exit side of the static mixer 7 in the transfer line a, and the other configuration is the same as that of the conventional diluting device. is there. In the present embodiment, the static mixer 7 having 6 to 24 elements is used, and the bellows tube 9 has a length configured by winding a circular tube 5 to 10 times with a diameter φ150 mm to φ300 mm. 4m ones are used.

  Next, the operation of the secondary dilution apparatus having the above configuration will be described.

  When the transfer pump 2 is driven, the primary diluent stored in the emulsion polymer primary dilution reservoir 1 flows from the transfer line a to the static mixer 7 via the valve 3, the check valve 4 and the flow meter 5. However, before the primary diluent is introduced into the static mixer 7, the secondary dilution water from the secondary dilution water line b passes through the valve 10, the check valve 11 and the flow meter 12 and is upstream of the static mixer 7 in the transfer line a. The secondary dilution water is added to the primary dilution that is fed to and flowing through it. Then, the primary dilution liquid to which the secondary dilution water has been added is introduced into the static mixer 7, dissolved and diluted with the secondary dilution water while passing through the static mixer 7, and then into the bellows tube 9. While being introduced and flowing through the bellows tube 9, it is dissolved by the secondary dilution water and diluted in two stages.

  As described above, in the secondary dilution apparatus according to the present embodiment, the primary dilution of the emulsion polymer is diluted in two stages by the static mixer 7 and the bellows tube 9. And an initial mixed state of secondary dilution water is formed. Then, a turbulent state is formed in the helically wound bellows tube 9, and the primary dilution liquid and the secondary dilution water are gradually mixed by this turbulent state. The primary dilution liquid is uniformly diluted to a desired dilution ratio with the degree of (about), and there is no problem that undispersed gel-like polymer remains in the secondary dilution liquid.

  Thus, the emulsion polymer uniformly diluted to a desired dilution ratio is supplied to a user (not shown) via the transfer line a, and is used for improving the yield of paper pulp.

  Next, based on the Example of this invention, this invention is demonstrated concretely.

Using a dilution apparatus according to the present invention and a conventional dilution apparatus having only a static mixer as a mixer, a concentration of 0.03 wt obtained by subjecting a primary dilution of an emulsion polymer that has been primarily diluted to 0.3% to a secondary dilution % Emulsion polymer in a 10 liter container,
1) Whether or not the gel-like polymer remains visually. 2) The liquid in the container was poured onto a 150 μm mesh sieve to check whether or not the gel-like polymer remained in the sieve.

  As a result, an undispersed gel-like polymer having a particle size of about 0.2 mm to 1 mm remained in the liquid subjected to the secondary dilution process by the conventional dilution apparatus. No undispersed gel polymer was observed.

  First, using a conventional diluting apparatus having only 15A, 12 and 24 element static mixers as a mixer, the primary diluted solution of the emulsion polymer which has been primarily diluted to a concentration of 0.16 wt% and 0.4 wt% is used as tap water. The second dilution treatment was performed under the conditions of a flow rate of 0.3 m / s to 2.0 m / s, and a dilutability confirmation test was performed as to whether or not the target concentration of 0.04 wt% could be achieved.

  The result is shown in FIG. 2. As shown in FIG. 2, the conventional diluting apparatus can only dilute the polymer to 0.025 wt%.

  On the other hand, the primary dilution of emulsion polymer that was first diluted to a concentration of 0.4 wt% using the apparatus of the present invention having a 15 A, 6-element static mixer and a bellows tube having a diameter of 15 A and a length of about 4 m as a mixer. Was subjected to a secondary dilution treatment with tap water at a flow rate of 0.4 m / s to 0.9 m / s, and a dilutability confirmation test was performed as to whether or not a target concentration of 0.04 wt% or more could be achieved.

  The results are shown in FIG. 3, and as shown in the figure, the emulsion polymer could be diluted to 0.055 wt% in the apparatus of the present invention. From this result, if a static mixer and a bellows tube are used as a mixer as in the apparatus of the present invention, the primary dilution of an emulsion polymer that cannot be diluted only by the static mixer can be easily diluted to a desired concentration. It was confirmed that there was no problem that undispersed gel polymer remained in the liquid after the treatment.

It is a block diagram of the dilution apparatus of the emulsion polymer which concerns on this invention, or its primary dilution liquid. It is a figure which shows the relationship between the polymer density | concentration obtained by the dilution confirmation test implemented using the conventional dilution apparatus, and the flow rate. It is a figure which shows the relationship between the polymer density | concentration obtained by the dilution confirmation test implemented using the dilution apparatus which concerns on this invention, and the flow rate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Primary dilution reservoir of emulsion polymer 2 Transfer pump 3 Valve 4 Check valve 5 Flow meter 6 Pressure gauge 7 Static mixer 8 Pressure gauge 9 Bellows tube 10 Valve 11 Check valve 12 Flow meter a Transfer line b Secondary dilution water line

Claims (1)

A primary or secondary dilution device for an emulsion polymer, wherein a transfer pump and a static mixer are provided in a transfer line extending from the emulsion polymer or its primary dilution liquid storage tank, and a dilution water line is connected to the inlet side of the static mixer of the transfer line. In
A primary or secondary dilution device for an emulsion polymer, wherein a bellows tube is disposed on the exit side of the static mixer in the transfer line.

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