JPS61118124A - Method for agitating liquid reactant - Google Patents

Abstract

PURPOSE:To eliminate the stagnation of a liq. reactant and to homogenize the reaction product by pouring plural liq. reactants onto the upper part of mixing member which is an opened flat plate or a bent slanting plate which vibrating of the mixing member. CONSTITUTION:A highly viscous liqd. 11 of PVA, etc. is supplied from a supply pipe 10, and a low-viscosity liq. 13 of formalin, etc. is supplied from a supply pipe 12. The liqs. 11 and 13 are poured onto a mixing member 14 which is bent in the semicircular form and is slanted vertically at 10-20 deg. angle of inclination, and the liqs. 11 and 13 are mixed at the bottom of the bent part of the mixing member 14. The mixing member 14 is vibrated by a vibrating mechanism 20, for example, at 60 cycle and with the vertical movement of about 3-5mm. The liqs. 11 and 13, poured onto the mixing member 14, are mixed on the mixer 14 by the vibration. The mixture is sent without any stagnation to the succeeding stage from the lower part of the mixing member 14.

Description

[Detailed description of the invention] (Technical field of invention) The present invention relates to a method for stirring multiple types of reaction solutions.

(Technical background of the invention and its problems) For example, a polyvinyl acetal (hereinafter referred to as PVAt) based porous material is produced by adding an aldehyde and an acid to an aqueous solution of polyvinyl alcohol (hereinafter referred to as PVA) in the presence of a pore-forming aid. Allow to act at a temperature of 40 to 90°C for 9 hours 4 to 40 hours 9
It is usually produced by converting PVA into 7-cetals for 8 hours or more, and the reaction stock solution is usually poured into a box, two cylinders, or other container and subjected to heat treatment.

The reaction stock solution here means a mixed aqueous solution or aqueous dispersion of PVA, a pore-forming aid, an aldehyde, and an acid, which may be colored with various colors or filled with fibers, inorganic materials, or other materials as necessary. It contains additives, plasticizers, etc. The method for producing this reaction stock solution is briefly explained as follows.
First, PVA is dissolved in wood under appropriate heating and the concentration is usually 4 to 1.
An aqueous solution of about H.H. is prepared, and if necessary, a pore-forming aid alone or an aqueous solution thereof or a dispersion agent is added in an amount of 10 to 200 fi% based on PVA and mixed uniformly. In addition, when a starch-based agent is used as a pore-forming aid, the aqueous dispersion thereof may be added to the PVA aqueous solution, mixed uniformly, and heated while stirring to N-swell the starch. PV
It can be obtained by adding 0.5 to 1.2 moles of aldehyde and a catalytic amount of acid to A and uniformly mixing them. The reaction stock solution prepared in this way is injected into the reaction vessel from the stock solution supply section through a liquid supply pipe by a stock solution supply means such as a pump, and through an injection nozzle installed above the reaction vessel, and then undergoes a predetermined treatment process to produce a product. There is one thing that is said to be.

Line 7 Jita and static mixers are known as devices that continuously feed two or more types of liquids that react, thicken, and gel when mixed as described above, and perform JI stirring. Figure 3 illustrates an example of a line agitator.
The liquid A is supplied to the mixing tank 3 via the feed pipe 1, and
Liquid B is fed through the feed pipe 2, and the motor 4 is fed into the mixing tank 3.
The mixed liquid is agitated by the rotation EEE5 and sent from the outlet pipe 6 to the next process. However, stirring in such a sealed mechanism creates a part in the system where the mixed liquid stagnates, and the stagnant liquid thickens and mixes with the mixed liquid, causing reactions in the mixed liquid. It exists unevenly as a part of the process. This has the drawback of making one reaction product physically and chemically heterogeneous.

(Object of the invention) This invention was made under the above circumstances,
An object of the present invention is to provide a stirring method in which a plurality of liquids that react to thicken and gel when mixed are continuously fed and stirred without stagnation. In particular, it is an object of the present invention to provide an effective stirring method in a method of mixing at a high temperature and casting and reacting in order to shorten reaction time.

(Summary of the Invention) The present invention relates to a method of continuously supplying and stirring a plurality of types of reaction liquids that react, thicken, and gel when mixed. The reaction liquid is allowed to flow down onto the upper part of the slanted mixing member, and the mixing member is vibrated so that the reaction liquid can be stirred without stagnation.

(Embodiment of the invention) FIG. 1 is a diagram showing an embodiment of the invention, in which a feed pipe l
A high viscosity liquid (for example, PVA) +1 is fed from O, and a low viscosity liquid (for example, formalin, sulfur, or a mixture thereof) 13 is fed from a feed pipe 12. The liquids 11 and 13 are curved in a semicircular shape, and the angle of 1θ
~20'' is made to flow down onto the vertically inclined mixing member 14, and at the bottom of the curved part of the mixing member 14, ill,
13 are mixed. The mixing member 14 is made of acid-resistant and corrosion-resistant material. And mixed parts! 4 (for example, 80 cycles with the vibration mechanism 20, about 3 to 5
The mixing member 14 is engaged by the vertical movement of the intestine (2), and the liquids 11 and +3 that have flowed down onto the mixing member 14 are mixed by the vibrations on the mixing member 14, and the liquids 11 and +3 are mixed on the mixing member 14 without stagnation. It will be sent to the next process from the bottom. Therefore, the liquids II and 13 are uniformly mixed by the mixing member +4p, which has the effect of making the reaction product 15 uniform both physically and chemically.

Further, FIG. 2 shows another embodiment of the present invention, in which the mixing member is an open cylindrical reaction tube 30, feeding pipes 31 and 32 are connected to the upper part of the mixing tube 30, and Rubber tubes 33 and 34 are connected to the ends of the feed tubes 31 and 32 to ensure smooth connection to a fixed part against vibrations of the mixing f330. Even in such a configuration, the two liquids supplied from the feed pipes 31 and 32 are agitated by the vibrations while falling in the mixing cylinder 30 without stagnation.

Next, the effects of this invention will be specifically explained using examples.

In a mixer with a stagnation part such as a line agitator, the stagnation reaction liquid thickens and gels over time.

A part of it is intermittently mixed into the mixed liquid and exists non-uniformly in the mixed liquid as a part where the reaction has proceeded. This makes the reaction product physically and chemically non-uniform, which is naturally exacerbated by continuous use of the mixer for long periods of time. Moreover, if the gelation rate, that is, the reaction rate is high, the above phenomenon will occur in a shorter time. For example, if the reaction temperature is increased to shorten the reaction time, or if the amount of catalyst is increased, this phenomenon becomes more noticeable.

Table 1 shows experimental data on the effects of temperature and sowing 1111.

In each of the above-mentioned Examples, an example in which two reaction solutions were stirred was explained, but the MfR of the reaction solutions is not limited to two types, and 31! It can also be applied when mixing liquids of class II or higher. Moreover, although the above-mentioned example showed a curved mixing member, it may be a flat plate.

(Effects of the Invention) As described above, according to the present invention, a plurality of types of liquids are allowed to flow down on the mixing member that is vibrated at an angle, and since there is no stagnation of reaction liquids, reaction products are It has the advantage that it can be made uniform and the mixing system can be easily cleaned.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of a device for realizing the method of this invention, Figure 2 is a diagram to explain another example of this emitting method, and Figure 3 is a diagram to explain a conventional stirring method. It is a diagram. 1G, 12.31.32...Feeding pipe, 11.13...
-Liquid, 14...Mixing member, 20...Vibration mechanism, 30
...Mixing tube.

Claims (1)

[Claims] In a method of continuously supplying and stirring multiple types of reaction liquids that react, thicken, and gel when mixed, each of the reaction liquids is caused to flow down onto the top of an open flat plate or a curved and inclined mixing member. Further, a method for stirring a reaction liquid, characterized in that the reaction liquid can be stirred without stagnation by vibrating the mixing member.