JPS6291230A - Reactor - Google Patents

Abstract

PURPOSE:To eliminate excessive addition of antifoaming agents and prevent antifoaming agents in excess of required quantity from mixing into specimen, by making up a reactor in such a way that a structure holding antifoaming agent is disposed above a liquid level in a reactor filled with liquid reactants. CONSTITUTION:A specimen 2 is fed through a filter plate provided at the bottom of a cylindrical reactor 1 and air is supplied through a pipe 10. On the other hand, a container 6 containing an organic-silicon antifoaming agent 'KURIRESU' S1015' is held above a liquid level 3, a cover 7 made of urethane foam being disposed on said container. During oxidation reaction, height H of foam 4 changes and the maximum height A is maintained on a level 9. With this equipment, the foam 4 never overflows or rungs over the upper end 8 of the reactor. Consequently, excessive addition of antifoaming agent is avoided, preventing antifoaming agent in excess of required quantity from mixing into the specimen.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reaction apparatus for suppressing foaming of a reaction liquid or a treatment liquid.

[Conventional technology]

Conventionally, foaming occurs during the process of processing liquid samples, and in order to prevent the foam from growing and spilling out of the container, it is necessary to detect the occurrence of foam and add an appropriate antifoaming agent to the sample liquid sequentially, or to prevent the foam from growing and spilling out of the container. In order to prevent foaming, an antifoaming agent was added to a predetermined concentration in advance.

[Problem that the invention seeks to solve]

However, such conventional methods have the disadvantage that the amount of antifoaming agent added is always excessive. When many antifoaming agents are added sequentially, the antifoaming effect generally tends to decrease with each addition, and the frequency of addition is greater at the end than at the beginning in one treatment process; In some cases, a large excess of antifoaming agent was added, which not only made it impossible to save on the antifoaming agent, but also resulted in the problem of undesirably accumulating unnecessary antifoaming agent components in the sample.

The present invention provides a reaction apparatus aimed at completely preventing excessive supply of antifoaming agent.

[Means for solving problems]

The present invention is a reaction apparatus characterized in that a structure for holding an antifoaming agent is installed above the liquid level in a reaction tank filled with a reaction liquid.

[Effect]

With the device of the invention, as soon as the growing foam touches the antifoam agent held above the liquid surface, the foam disappears completely. Curiously, only a small amount of antifoaming agent is consumed by contact, compared to when it is added to the liquid, and foam that grows again can be defoamed in the same way.

The structure for holding the antifoaming agent may be, for example, one in which the antifoaming agent is contained in a porous object, or a structure in which the antifoaming agent is placed in a shallow dish-shaped container and held above the liquid surface. good.

〔effect〕

As described above, according to the apparatus of the present invention, an excessive amount of antifoaming agent is not added, and therefore there is no fear that more antifoaming agent will be mixed into the sample than necessary. This means that as soon as the generated foam with a low surface tension comes into contact with the antifoam component held in various forms, the antifoam agent will effectively spread throughout the foam, albeit in a small amount, and excess It is thought that a different effect can be expected from adding the antifoaming agent, and therefore, it has the effect of suppressing wasteful consumption of the antifoaming agent and also eliminating accumulation of the antifoaming agent.

〔Example〕

Examples of the present invention are shown below.

The reaction apparatus of the present invention shown in FIG. 1 was used to air oxidize ferrous ions in sample water containing 0.01 ts of oleic acid. A filtration plate was provided at the bottom of a cylindrical reaction tank 1 with a diameter of 18 cIrL, through which 3 samples 2 were introduced and supplied from a pipe 10 at a rate of 31 αirf/min.

On the other hand, a 6 ton container containing the organosilicon antifoaming agent Kuriles S 1015 K (50 m) was placed 10 cIIL above the liquid level 3, and a urethane foam cover 7 was placed on top of the container.
I did it. While the oxidation reaction continued, the height H of the bubbles 4 changed over time as shown in Figure 2, and the maximum height A was maintained at the level 9 in Figure 1, but during the oxidation reaction for 1 hour, the height H of the bubbles 4 changed as shown in Figure 2. The total concentration of antifoam transferred is 20 r! ? 'l or less. Using this device, bubbles did not overflow or boil over from the top 8 of the reactor.

(Comparative example) The same reaction as in the example was carried out except that the antifoaming agent was not held on the liquid surface and the antifoaming agent was directly dropped.
It had to be added more than once, and boiling over occurred after a while. Furthermore, when the apparent addition concentration was calculated from the amount of antifoaming agent consumed, it was over 300 m9711, and the addition effect gradually became smaller.

As specifically shown above, the effects of the reaction apparatus of the present invention are clear.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a diagram showing temporal changes in bubble height. 1... Reaction tank, 2... Sample, 3... Liquid level, 4...
・Foam, 5... Antifoaming agent, 6... Container Patent applicant: NEC Corporation Patent attorney: Susumu Uchihara No. 1
Figure 2

Claims (1)

[Claims] (1) A reaction device characterized in that a structure for holding an antifoaming agent is installed above the liquid level in a reaction tank filled with a reaction liquid.