JPH0243481Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a flask shape useful for rotary evaporators.

[Prior art and its problems] Rotary evaporators are commonly used in chemical laboratories or relatively small-scale manufacturing plants for concentrating sample solutions, drying samples, recovering solutes, and the like.

Such rotary evaporators have the advantage of being applicable to a wide range of applications, being relatively inexpensive, and easy to handle. Several problems arise when applied to substances and (3) water samples.

On the other hand, although the scope of application is limited and it is a relatively large-scale device, continuous thin film evaporators are used for the concentration of (1) and (2) above. A spray type cyclone type evaporator is said to be suitable for this purpose. All of these devices heat the sample at a relatively low temperature and process quickly, so they are particularly suitable for processing substances with poor thermal stability. However, it is expensive and lacks the convenience of a rotary evaporator.

When a rotary evaporator is applied to the above-mentioned samples, there are problems such as low efficiency, a long time required for a unit throughput, and thermal decomposition of the sample inside the flask during the concentration operation.

In order to compensate for these drawbacks, flasks with many dimples formed on the main body were developed in 1983.
Proposed by No. 63037. According to the specification, by forming a large number of dimples, it is possible to achieve an improvement in efficiency of about 10% in terms of evaporation amount.

[Means for Solving the Problems] The present invention was made for the purpose of providing a flask shape for a rotary evaporator that is more efficient and easier to handle (for example, cleaning and recovering solutes). The gist is a flask for a rotary evaporator whose main body wall has a substantially polygonal cross section.

In the present invention, it is easy and economical to form the polygonal cross section of the main body wall of the flask by die blow molding, but in the case of single-piece manufacturing, it is possible to form the polygonal cross section as the main body wall of the flask by local heating. It is also possible to mold them one by one. The original flask may be round, flat-bottomed, or round-bottomed, as well as eggplant-shaped.

The polygonal cross section may be formed by edges protruding from or retracting from the wall surface before secondary processing. This edge may run vertically (see FIG. 1a) or spirally (see FIG. 1b) with respect to the centerline of the body.

Substantially any non-circular cross section can achieve the object of the present invention. Further, the glass wall thickness of the main body portion is approximately constant regardless of the unevenness, and the polygonal shapes inside and outside the walls are approximately similar to each other.

Considering ease of manufacture and convenience in handling, it is preferable to have a pattern that is as simple as possible, although there is a trade-off with the effect of improving efficiency.

[Function] Making the main body wall substantially polygonal naturally contributes to increasing the heat transfer surface and sample thin film forming surface (formed by lifting the sample liquid) of the wall. This increases the stirring effect on the sample and the heat medium (oil in the oil bath) and contributes to improving the heat exchange efficiency between the two. Therefore, such a shape of the main body wall synergistically exhibits the above-mentioned effects based thereon, and the purpose of evaporating and concentrating the sample can be achieved extremely efficiently.

Moreover, the efficiency can be further improved compared to the flask proposed in Japanese Utility Model Application No. 58-63037 in which a large number of dimples are formed in the main body.

[Example] Figures 1a and b show schematic external views of an embodiment of the flask of the present invention constructed in this way, and Figure 2 shows a corresponding view along the 2-2 plane of the flask shown in Figure 1. (a, b) show cross-sectional views. Throughout each figure, number 1 indicates the flask body, number 3 indicates the position of the ridge, and the thickness of the glass wall is approximately constant regardless of the unevenness. When these were adopted as the core components of a rotary evaporator, the performance of the evaporator could be significantly improved. for example,
When the solution shown in Figure 1b (volume 1L, wall thickness 1.5mm) is used to concentrate an aqueous solution that has a large latent heat of vaporization and is said to have the lowest concentration efficiency, an efficiency improvement of about 20% (time reduction) can be achieved. Obtained. Efficiency improvements of no less than 20% can be obtained with solvents other than water.

Furthermore, the effect of such deformation on the strength of the main body is not as great as initially feared as long as the area of each flat or concave part is not made too large;
The material shown in (b) was confirmed to be able to withstand a reduced pressure of 2 mmHg.

[Effect] As described above, according to the present invention, the evaporation and concentration efficiency of a rotary evaporator flask can be greatly improved by adding an extremely simple means, that is, one easy-to-implement step, and its practical use is greatly improved. The effect is great.

[Brief explanation of drawings]

1A and 1B are schematic external views showing various embodiments of the flask of the present invention, and FIGS. 2A and 2B are sectional views taken along the plane 2--2 of FIG. 1... Flask body, 3... Approximate position of the ridge.

Claims (1)

[Scope of utility model registration request] A rotary evaporator flask whose main body wall has a substantially polygonal cross section.