JPH07236801A - Distiller utilizing mechanical vibration - Google Patents

Abstract

PURPOSE:To enhance the heat transfer efficiency of a heat transfer pipe, in a distiller wherein the heat transfer pipe is inserted in the bottom part of a column, by arranging a wire transmitting mechanical vibration in the vicinity of the heat transfer pipe and applying mechanical vibration to the liquid present in the bottom part of the column to prevent the adhesion of scale to the heat transfer pipe. CONSTITUTION:In a distiller wherein a heat transfer pipe 3 is inserted in the bottom part of a column, a wire 7 transmitting mechanical vibration is arranged in the vicinity of the heat transfer pipe 3 and the contact surface of the heat transfer pipe 3 with the liquid present in the bottom part of the column is vibrated. The wire 7 transmitting mechanical vibration is pref. composed of a piano wire or a coil wire low in the coefficient of thermal expansion and excellent in durability. Vibration is applied to the wire by attaching the wire to an oscillator under tension. By this constitution, in the case of a liquid containing low, medium and high b.p. components and easy to generate scaling on the heat transfer pipe during distillation, the recovery efficiency of the medium b.p. component being a product is enhanced and the heat efficiency of the heat transfer pipe can be enhanced and the number of times of the cleaning of the heat transfer pipe can be reduced.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a distiller utilizing mechanical vibration. More particularly, the present invention relates to a still using a mechanical vibration and a method for recovering low boiling components and medium boiling components from a feedstock using the still.

[0002]

2. Description of the Related Art The heat source of a distiller is supplied by a reboiler. Depending on how the reboiler is installed, the reboiler is installed inside the distiller bottom and the reboiler is installed outside the distiller. There is an extrapolation type to supply. Here, when a heat source is supplied to the treatment liquid by the reboiler, a scale may be generated in the heat transfer tube (plate) of the reboiler by the treatment liquid. For example, when the treatment liquid which is easily deteriorated by heat or the evaporation residue is easily attached to the heat transfer tube, the scale is easily attached. When such a treatment liquid is treated with a distiller, the scale adheres to reduce the thermal efficiency. Particularly, in the reboiler interpolating type, it is necessary to stop the operation of the device even if it is attempted to repair due to scale adhesion, or it is difficult to repair and the repair period becomes long, so it is necessary to prevent scale adhesion.

As a measure for preventing scale adhesion, what has been carried out so far is often a method of removing components causing scale adhesion before entering a distiller. Further, in the apparatus, a method of rotating the heat transfer tube to apply a shearing force between the processing liquid and the heat transfer tube to prevent adhesion and to transfer heat while cleaning itself is also adopted. Alternatively, a method of smoothing the surface condition of the heat transfer tube to prevent the scale from adhering to it has been adopted.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a distiller in which no scale adheres to a heat transfer tube and a distillation method using the distiller.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have set a wire or a coil near the heat transfer tube in order to eliminate these defects,
It was found that mechanical vibration may be applied to this to vibrate the contact surface between the heat transfer tube and the liquid existing at the bottom of the tower with a sound wave, and the present invention has been completed.

That is, the present invention is characterized in that, in a distiller in which a heat transfer tube is inserted at the bottom of a column, a wire for transmitting mechanical vibration is arranged in the vicinity of the heat transfer tube to impart mechanical vibration to the liquid existing at the bottom of the column. Is a distiller utilizing mechanical vibration,
Further, it is a method of recovering low boiling point and medium boiling point from the feed material, characterized in that low boiling point content is separated from the feed material by the above-mentioned distiller, and then middle boiling point content is separated.

FIG. 1 is a perspective view showing an outline of a tower bottom portion in which a wire for transmitting mechanical vibration is arranged near the heat transfer tube. The wire for transmitting mechanical vibration is a piano wire or a coil thereof, and it is preferable that the wire has a small coefficient of thermal expansion and excellent durability. Specific examples include piano wire type A (SWP-A), chrome vanadium steel oil temper wire for valve springs, silicon chrome steel oil temper wire for valve springs, and silicon manganese steel oil temper wire for valve springs. The thickness of the wire is preferably 0.5 m / mφ to 5.0 m / mφ, and the distance between the wire and the heat transfer tube is 1 m / m to 10 m / m. Especially 2m / m
φ to 3 m / mφ is good. 10 as mechanical vibration frequency
A low frequency of up to 500 Hz is good.

As a method of transmitting vibration to a wire, a method of drawing a wire from an oscillator as shown in FIG. 2 is exemplified.

The liquid treated in the still of the present invention is a liquid composed of a low-boiling component, a medium-boiling component and a high-boiling component, and is a liquid in which scaling occurs easily in the heat transfer tube during distillation. More specifically, it is a case where a reverse-dissolving substance such as calcium sulfate is contained in the treatment liquid, or a substance which is unstable to heat and easily adheres to the heat transfer tube by heating is mixed. In particular, a solution obtained by removing a hydrochloric acid catalyst and water from a reaction mixture of phenol and acetone, in which a low-boiling component is unreacted phenol and a medium-boiling component is bisphenol A is mentioned as a treatment liquid.

During distillation, the degree of vacuum and heating temperature of the distiller are appropriately selected and set according to the type of treatment liquid.

[0011]

The present invention will be described in detail below with reference to examples. Example 1 FIG. 1 is a perspective view showing the outline of the apparatus. In FIG. 1, 1
Is the inlet of the processing liquid, 2 is the outlet of the processing liquid, 3 is 45φ / 39
φ (SUS 33TP-S) heat transfer tubes, 4 passage walls (height 157 mm), 5 packed columns (size: 700φ ×
1260 mm, filled with Raschig rings (300 mm). ), 6 is the bottom of the tower (size: 2700 × 142)
0). The distance between the wire 7 giving mechanical vibration and the heat transfer tube 3 was 2 m / m. The treatment liquid was charged into the bottom of the tower, and heating was started using a heat medium. The temperature of the heating medium was 280 ° C. The degree of vacuum in the still was 5 mmHg abs. FIG. 2 is an enlarged view of a portion showing the relationship between the heat transfer tube and the line giving mechanical vibration. FIG. 3 is a schematic diagram showing the relationship between the oscillator and the line transmitting mechanical vibration. In FIG. 3, 8 is an oscillator. The wire for transmitting mechanical vibration was made of stainless steel (SUS) and had a thickness of 2 mmφ. The treatment liquid was distilled while applying mechanical vibration. The frequency of mechanical vibration was given from a 250 Hz oscillator. The results of distillation are shown in Table 1.

Comparative Example 1 The treatment liquid was heated in the apparatus of Example 1 without applying mechanical vibration. The results of distillation are shown in Table 1.

[0013]

[Table 1] BPA: Bisphenol A LB: Low molecular weight phenol derivative HB: High molecular weight phenol derivative OP-BPA: Ortho-para coordinated bisphenol A co-dimer: Copolymer Comparative Example 1 gives mechanical vibration. If not, Example 1 represents the separation result when mechanical vibration was applied.

The yield of the desired BPA component was the same as in Comparative Example 1.
In contrast to 6,704.66 / 6,827.57 = 98.2%, Example 1 has 6,761.77.
/6,827.57=99.03%. Also, when the heating medium was supplied at 280 ° C., Comparative Example 1 came out at 272 ° C. and the temperature difference was 8 ° C.
However, in Example 1, the thermal efficiency slightly increased at 270 ° C. As a scaling prevention measure, the number of cleanings required twice a year in Comparative Example 1, but the number of cleanings performed once a year in Example 1.

[0015]

EFFECT OF THE INVENTION The efficiency of recovering the medium boiling point product is improved,
It has become possible to improve the thermal efficiency of the heat transfer tube and reduce the number of times the heat transfer tube is cleaned.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a tower bottom portion in which a wire for transmitting mechanical vibration is arranged near a heat transfer tube.

FIG. 2 is an enlarged view of a portion showing a relationship between a heat transfer tube and a line that gives mechanical vibration.

FIG. 3 is a schematic diagram showing a relationship between an oscillator and a line for transmitting mechanical vibration.

[Explanation of symbols]

 1 Treatment Liquid Inlet 2 Treatment Liquid Outlet 3 Heat Transfer Tube 4 Passage Wall 5 Packed Column 6 Tower Bottom 7 Mechanical Vibration Line 8 Oscillator

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Koichi Takahashi, 2-chome, Tango-dori, Minami-ku, Nagoya, Aichi Prefecture Mitsui Toatsu Chemical Co., Ltd. (72) Koichiro Terada, 2-chome, Tango-dori, Minami-ku, Aichi Prefecture Mitsui Toatsu Chemical Co., Ltd. (72) Inventor Tsukasa Motooka 2-1, Tango-dori, Minami-ku, Aichi Prefecture Nagoya-shi Mitsui Toatsu Chemical Co., Ltd. (72) Yuko Takatsu Tango-dori, Minami-ku, Nagoya-shi, Aichi 2-1, 1 Mitsui Toatsu Chemical Co., Ltd.

Claims (3)

[Claims] 1. A distiller in which a heat transfer tube is inserted at the bottom of a column, wherein a line for transmitting mechanical vibration is arranged near the heat transfer tube, and mechanical vibration is applied to a liquid existing at the bottom of the column. Distiller that utilizes dynamic vibration. 2. A method for recovering a low boiling point component and a medium boiling point component from a feed material, which comprises separating a low boiling point component from a feed material by the distiller of claim 1 and then separating a medium boiling point component. 3. A feedstock obtained by removing a hydrochloric acid catalyst and water from a reaction mixture of phenol and acetone, wherein the low boiling point is unreacted phenol and the medium boiling point is bisphenol A. The method of claim 2.