JP2021065869A - Rotary liquid sprayer and evaporator with the same - Google Patents

Abstract

To provide a rotary liquid sprayer capable of reducing the generation of the unnecessary splash of a raw material liquid in an agitation vessel and to provide an evaporator with the same.SOLUTION: A rotary liquid sprayer comprises: an annular base part having an inside surface expanding upward from a lower edge to an upper edge; a plurality of gutter-shaped members radially expanding upward from a part of circumference composing the upper edge of the annular base part; and a connection part mutually connecting the plurality of gutter-shaped members and being attachable to the rotary shaft of an evaporator. The rotary liquid sprayer is disposed in the agitation vessel of the evaporator and spraying and evaporation can be performed under the heat source of a volatile component contained in a raw material liquid in the agitation vessel.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rotary sprinkler and an evaporator including the rotary sprinkler, and more specifically, a rotary sprinkler for spraying a volatile component contained in a raw material liquid in a stirring tank onto a heat source to evaporate the rotary sprinkler. With respect to the evaporator.

For example, in the fields of the food industry, chemical industry and pharmaceutical industry, an evaporator called a "flow thin film evaporator" is used to recover or separate a solvent which is a volatile component from a liquid containing impurities and impurities. There is.

A conventional flow-down thin film evaporator includes a stirring tank having an inner wall heated by a heat source, and a roller or a wiper that circulates in contact with the inner wall of the stirring tank. This flow-down thin film evaporator heats the raw material liquid that has flowed down on the inner wall while forming a wet surface from above the stirring tank, and evaporates the volatile components contained in the raw material liquid on the inner wall, while circulating on the inner wall. The surface of the raw material liquid existing on the heat transfer surface of the inner wall can be forcibly renewed by the roller or wiper, and the evaporation efficiency can be improved. However, in such a flow-down thin-film evaporator, the supplied raw material liquid moves in a single flow by the so-called "one opus", so if the raw material liquid contains a large amount of volatile components, the inner wall is covered. The volatile components may not be sufficiently evaporated before flowing down, and improvement in evaporation efficiency has been desired.

On the other hand, in recent years, the raw material liquid is temporarily stored in the stirring tank, and instead of the roller and the wiper, the raw material liquid stored in the stirring tank is scooped up by rotating in the horizontal direction in the stirring tank. Later, an evaporator equipped with a rotary sprinkler that pulls up the raw material liquid scooped up with the rotation through a gutter-shaped flow path and sprays it from the upper end toward the inner wall of the stirring tank has been proposed ( For example, Patent Document 1). In the evaporation device provided with such a rotary liquid sprinkler, the raw material liquid can be repeatedly sprayed and flowed down on the inner wall in the stirring tank, so that the volatile components in the raw material liquid can be efficiently evaporated. Here, Patent Document 1 states that the raw material liquid can be concentrated stepwise by arranging such a rotary sprinkler in a multi-stage manner in the vertical direction, and that a condenser (cooler) is arranged in the stirring tank. It is also described that the volatile components evaporated by the above can be condensed on a capacitor and recovered as a liquid.

However, the rotary sprinkler described in Patent Document 1 may violently shake the liquid level of the raw material liquid when it rotates in the stirring tank of the evaporator to scoop up the raw material liquid. In particular, if the amount of the raw material liquid stored in the stirring tank is small, it may be difficult to properly scoop up the raw material liquid from the rotary sprinkler due to the fluctuation of the liquid level.

Alternatively, unnecessary droplets of the raw material liquid may be generated in the stirring tank due to spraying on the inner wall of the stirring tank or shaking of the liquid level. When the amount of droplets of the raw material liquid generated in the stirring tank increases, the possibility that it adheres to the condenser arranged in the stirring tank increases, and the volatile components condensed in the condenser are contaminated to obtain the purity. It is possible that it will lead to a decline.

In this way, the evaporator equipped with the rotary sprinkler has improved the evaporation efficiency of the volatile components as compared with the conventional flow-down thin film evaporator, and at the same time, for reducing the splash of the raw material liquid in the stirring tank. New improvements are desired.

International Publication No. 2016/143776

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is a rotary sprinkler capable of reducing the generation of unnecessary droplets of a raw material liquid in a stirring tank and an evaporation device provided therewith. To provide the equipment.

The present invention is a rotary sprinkler for spraying a raw material liquid arranged in a stirring tank of an evaporator and stored in the stirring tank to a heat source.
An annular base having an inner surface that increases in diameter from the lower end to the upper end,
A plurality of gutter-shaped members extending upward radially from a part of the circumference constituting the upper end of the annular base.
A connecting portion that connects the plurality of gutter-shaped members to each other and can be attached to the rotating shaft of the evaporator.
It is a rotary sprinkler.

In one embodiment, along the inner surface of the annular base, a shielding portion is provided that controls the movement of the raw material liquid from the lower end to the upper end of the annular base, and the raw material liquid is the raw material liquid. It is possible to move from the lower end to the upper end of the annular base through a plurality of openings provided in the shield.

In a further embodiment, the plurality of gutter-shaped members are provided corresponding to the positions of the plurality of openings of the shielding portion in the annular base portion.

In one embodiment, the plurality of gutter-shaped members have a substantially arcuate flow path cross section in the length direction, and the curvature of the flow path cross section increases from the lower end to the upper end of the gutter-shaped member. fluctuate.

In one embodiment, the plurality of gutter-shaped members have a bent portion that bends inward in the direction of rotation.

The present invention is also an evaporator.
A stirring tank having a raw material liquid supply port, a volatile component outlet, and a concentrated liquid outlet and accommodating the raw material liquid.
A heat source provided inside the stirring tank and
A sprinkling unit provided in the stirring tank and flowing the raw material liquid into the heat source,
A first condenser provided on the outer circumference of the stirring tank and cooling the inner wall of the stirring tank,
With
The sprinkler unit is an evaporation device including a rotary shaft and the rotary sprinkler attached to the rotary shaft.

In one embodiment, the evaporator of the present invention further includes a second condenser inside the stirring tank, and the second condenser is arranged inside the rotation locus of the sprinkler portion.

In a further embodiment, the evaporator of the present invention is provided with a second volatile component outlet at the bottom of the stirring tank, and the second volatile component outlet is arranged below the second condenser.

The present invention is also an evaporation system including a raw material tank containing a raw material liquid and the evaporation device for processing the raw material liquid supplied from the raw material tank.

According to the present invention, volatile components can be efficiently evaporated from the raw material liquid without using members such as rollers and wipers. Further, upon this evaporation, the generation of droplets of the raw material liquid in the stirring tank is reduced, and the possibility of the droplets being mixed with the volatile components separated and condensed from the raw material liquid and contaminating the volatile components is avoided. be able to.

It is a perspective view of the rotary liquid-spraying tool which shows an example of the rotary-spraying tool of this invention. FIG. 5 is a cross-sectional view taken along the line AA of the rotary sprinkler shown in FIG. It is sectional drawing in the BB direction of the rotary sprinkler shown in FIG. FIG. 5 is a sectional view taken along the line CC of the rotary sprinkler shown in FIG. FIG. 5 is a partial cross-sectional view schematically showing an example of the evaporator device of the present invention provided with the rotary sprinkler shown in FIG. It is a figure which shows typically the evaporation system provided with the evaporation apparatus of this invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

(Rotary sprinkler)
FIG. 1 is a perspective view of the rotary sprinkler showing an example of the rotary sprinkler of the present invention.

The rotary sprinkler 100 of the present invention is composed of an annular base 102, a plurality of gutter-shaped members 104, and a connecting portion 106.

The annular base 102 has an annular shape that is substantially circular along the horizontal direction and has a hollow center. A sectional view of the rotary sprinkler 100 shown in FIG. 1 in the AA direction is shown in FIG. As shown in FIG. 2, the annular base 102 has an inner surface 112 whose diameter increases from the lower end 108 toward the upper end 110. The inner surface 112 has a preferably smooth surface from the lower end 108 to the upper end 110, and by rotating the rotary sprinkler 100 at a predetermined speed or higher in the stirring tank in which the raw material liquid is stored, the raw material liquid can be obtained as a raw material. Due to the viscosity of the constituents contained in the liquid and the centrifugal force applied to the constituents, it spreads over the entire inner surface 112, more specifically pumped from the lower end 108 of the inner surface 112 and moves toward the upper end 110. can do.

2, the inclination angle theta ₁ of the inner surface 112 with respect to the vertical direction of the rotation Chiekigu 100 is expressed as the slope angle of the inner surface 112 against the vertical line _{V L1.} The inclination angle θ ₁ of the inner surface 112 is not necessarily limited, but is preferably 1 ° to 10 °. When the inclination angle θ ₁ is less than 1 °, the rise of the inner surface is too large with respect to the liquid surface (horizontal plane) of the raw material liquid, and the raw material liquid does not sufficiently move from the lower end to the upper end even when rotated at high speed. is there. When the inclination angle θ ₁ exceeds 10 °, the rise of the inner surface of the raw material liquid with respect to the liquid surface (horizontal plane) is too small, and the rotary sprinkler itself becomes large at least in the horizontal direction. Can be difficult to configure.

Further, the annular base 102 may be provided with an annular shielding portion 114 on the inner surface 112. The shielding portion 114 is arranged along the inner surface 112 of the annular base portion 102, and can control the movement of the raw material liquid from the lower end 108 to the upper end 110 of the annular base portion 102. Specifically, the shielding portion 114 includes an annular shielding plate 116 extending in the horizontal direction with respect to the inner surface 112 of the annular base 102, and a plurality of openings 118 arranged in the shielding plate 116 at predetermined intervals. (See, for example, FIG. 3). The raw material liquid that moves upward from the lower end 108 of the annular base 102 due to the rotation of the rotary sprinkler 100 is once blocked from moving upward by the shielding plate 116 of the shielding portion 114, and is inside along the shielding plate 116. It moves so as to spread horizontally on the surface 112. Then, the raw material liquid can pass through the openings 118 through the plurality of openings 118 provided between the shielding plates 116 and can be moved upward of the annular base 102 again. As a result, the raw material liquid can move from the lower end 108 to the upper end 110 of the annular base 102 through the plurality of openings 118 provided in the shielding portion 116 of the annular base 102 in a state where the movement is controlled by the shielding portion 116. ..

The mounting position of the shielding portion 114 on the annular base 102 is not necessarily limited, but when the rotation of the rotary sprinkler 100 is stopped, the liquid level of the raw material liquid stored in the stirring tank is shielded by the shielding portion 114 as much as possible. It is preferably provided near the upper end 110 of the annular base 102 in order to prevent it from being located above the plate 116.

Further, a flange-shaped protrusion 120 may be provided along the outer circumference of the annular base 102. Due to the rotation of the rotary sprinkler 100, the raw material liquid stored in the stirring tank has the inner surface 112 of the annular base 102 due to the viscosity of the constituents contained in the raw material liquid and the centrifugal force applied to the constituents. As well as spreading and moving as in, the outer surface 122 of the annular base 102 may also spread upward from the lower end 108. In order to prevent the movement of the raw material liquid on the outer surface 122 of the annular base 102, the flange-shaped protrusion 120 serves as a shielding wall. That is, the flange-shaped protrusion 120 hinders the movement of the raw material liquid rising from the lower end 108 of the annular base 102 along the outer surface 122 due to the rotation of the rotary sprinkler 100, and is above the flange-shaped protrusion 120. It is possible to prevent the raw material liquid from moving to the flange. As a result, the raw material liquid can be pumped from the lower end 108 of the annular base 102 and moved only from the inner surface 112 of the annular base 102.

The mounting position of the flange-shaped protrusion 120 on the annular base 102 is not necessarily limited, but the liquid level of the raw material liquid stored in the stirring tank is flange-shaped as much as possible when the rotation of the rotary sprinkler 100 is stopped. It is provided at a position away from the lower end 108 of the annular base 102 (for example, on the outer circumference of the annular base 102 and in the vicinity of the upper end 110 of the annular base 102) in order to prevent the annular base 102 from being located above the protrusion 120. It is preferable to have.

The size of the annular base 102 is not necessarily limited. It can be designed to any size depending on the capacity and inner diameter of the stirring tank of the installed evaporator.

The annular base 102 is composed of, for example, a metal such as iron, stainless steel, hastelloy, titanium, and a material made of a combination thereof. The annular base 102 may be provided with a coating known in the art such as Teflon (registered trademark), glass lining, and rubber lining in order to enhance chemical resistance.

As shown in FIG. 2, a plurality of gutter-shaped members 104 are provided so as to extend upward from a part of the circumference forming the upper end 110 of the annular base 102. The number of gutter-shaped members 104 provided on the annular base 102 is not necessarily limited, but preferably 2 to 6 gutter-shaped members 104 are provided. It is also preferable that the plurality of gutter-shaped members 104 are provided at predetermined intervals so as to be substantially equiangular with respect to the rotation axis of the annular base 102.

The gutter-shaped member 104 collects the raw material liquid that has moved to the upper end 110 of the annular base 102 by the rotation of the rotary sprinkler 100, and the raw material liquid is passed through the flow path 126 provided inside by the rotation to the gutter-shaped member 104. Can be moved from the lower end 128 to the upper end 130.

The flow path 126 of the gutter-shaped member 104 may have, for example, a substantially arc-shaped or semi-cylindrical cross section as shown in FIG. Alternatively, the flow path 126 of the gutter-shaped member 104 may have a flow path cross section like a half pipe other than the semi-cylindrical shape, such as a half-sided cylinder or a V-shape, or shown in FIG. The lower end 128 and the upper end 130 have such a flow path cross section of a harp pipe, and the intermediate portion between them is processed into a cylindrical shape (for example, a cylindrical shape, an elliptical tubular shape, or a square tubular shape). Alternatively, the whole may be processed into a cylindrical shape (for example, a cylindrical shape, an elliptical tubular shape, or a square tubular shape).

In the present invention, when the gutter-shaped member 104 has a substantially arcuate flow path cross section as shown in FIG. 3, the curvature of the flow path cross section varies from the lower end 128 to the upper end 130 of the gutter-shaped member 104, preferably. It is designed to increase from the lower end 128 to the upper end 130. For example, at the lower end 128 of the gutter-shaped member 104, it is desired to collect more and more efficiently the raw material liquid that has risen from the lower portion 108 of the annular base 102 along the inner surface 112. Therefore, it is preferable that the cross section of the flow path at the lower end 128 of the gutter-shaped member 104 has a curvature that matches a part (arc) of the circumference forming the upper end 110 of the annular base 102. On the other hand, it is desired to prevent the raw material liquid collected at the lower end 128 of the gutter-shaped member 104 from spilling out from the flow path 126 of the gutter-shaped member 104 when moving to the upper end 130. Therefore, for example, the curvature of the flow path cross section is gradually increased from the lower end 128 to the upper end 130 of the gutter-shaped member 104 so that the raw material liquid moving in the flow path 126 does not spread to the side of the gutter-shaped member 104 and is not spread to the upper end. It can be efficiently moved toward 130. In one embodiment of the present invention, as shown in FIG. 4, the curvature of the flow path cross section on the substantially arc of the flow path 126 at a position intermediate or higher than that of the gutter-shaped member 104 is a gutter as shown in FIG. It is designed to be larger than the curvature of the flow path 126 at a position near the lower side of the shaped member 104.

Further, in the rotary sprinkler 100 of the present invention, when the shielding portion 114 is provided on the annular base 102, the gutter-shaped member 104 is located at the position where the opening 118 of the shielding portion 114 on the annular base 102 is provided. It is preferable that it is provided corresponding to. In this case, the raw material liquid rising from the annular base 102 by the shielding portion 114 is discharged toward the upper end 110 of the annular base 102 only from the opening 118. By arranging the gutter-shaped member 104 at such a position, the raw material liquid discharged from the opening 118 can be efficiently collected in the gutter-shaped member 104.

Referring to FIG. 2 again, in the rotary sprinkler 100 of the present invention, the plurality of gutter-shaped members 104 are bent inward in the rotational direction at, for example, a bent portion 132 in the middle or the vicinity thereof in the height direction. Is preferable. The rotary sprinkler 100 of the present invention has a structure in which the upper end 130 of the gutter-shaped member 104 is closer to the shaft fixing portion 134 side by bending at the bending portion 132. As a result, the overall diameter L _w of the rotary sprinkler 100 becomes shorter, and it is possible to have a compact structure in the radial direction, and the rotary sprinkler of the present invention is also applicable to an evaporator having an elongated stirring tank. It will be possible. In FIG. 2, the number of bent portions 132 provided in one gutter-shaped member 104 is one, but the present invention is not limited to this. Two or more bent portions may be provided for the gutter-shaped member 104.

Angle theta ₂ bent in the bending portion 132, as shown in FIG. 2, represented as an inclination angle of the upper trough member 104a from the bent portion 132 with respect to the vertical line _{V L2} to the upper end 130. The bending angle θ _{2 at the} bending portion 132 is not necessarily limited, but is preferably 1 ° to 10 °. When the bending angle θ ₂ is less than 1 °, the overall diameter L _{w of} the rotary sprinkler 100 does not become too small even though the bending portion 132 is provided, and the stirring tank to be accommodated is made compact. May be difficult. When the bending angle θ ₂ exceeds 10 °, the inclination of the gutter-shaped member 104 from the bent portion 132 to the upper end 130 becomes large, and even if the rotary sprinkler is rotated at high speed, the raw material liquid efficiently reaches the upper end 130. It may not move.

The gutter-shaped member 104 is also located on one side of the edges 135, 136 of the flow path 126 (of the two edges 135, 136 of the flow path 126, the edge 135 side located rearward in the rotational direction). For example, a flap-shaped member 138 extending from the vicinity of the lower end 128 to a part of the inner surface 112 of the annular base 102 may be provided. Due to the rotation of the rotary sprinkler 100, the raw material liquid moves from the lower end 108 of the annular base 102 to the upper end 110 and is collected at the lower end 128 of the gutter-shaped member 104. There is a concern that it may spill out from the edge 134 side near the lower end 128 of the gutter. In such a case, by providing the flap-shaped member 138, the flap-shaped member 138 shields the movement of the raw material liquid in the rotational direction on the edge 134 side of the gutter-shaped member 104, and the raw material liquid spills out. This can be avoided or reduced.

As shown in FIG. 2, when the lower end of the flap-shaped member 138 extends to a part of the inner surface 112 of the annular base 102, the lower end is higher than the liquid level of the raw material liquid stored in the stirring tank. It is also conceivable that the raw material liquid itself, which is located below and is stored by the rotation of the rotary sprinkler, is agitated, the liquid level fluctuates greatly up and down, or unnecessary droplets are generated. In such a case, the lower end of the flap-shaped member 138 is above the surface of the raw material liquid in the assumed stirring tank (for example, the lower end 108 of the gutter-shaped member 104 or the shielding portion 114 where the annular base 102 is arranged). It may be arranged at the same height as or higher than the above to avoid such fluctuations in the liquid level and the generation of droplets.

The gutter-shaped member 104 is composed of, for example, a metal such as iron, stainless steel, hastelloy, or titanium, and a material made of a combination thereof. The gutter-shaped member 104 may be provided with a coating known in the art such as Teflon (registered trademark), glass lining, and rubber lining in order to enhance chemical resistance.

Referring to FIG. 1 again, the connecting portion 106 has a shaft fixing portion 134 for accommodating and fixing a rotating shaft (described later) extending from the upper part of the stirring tank of the evaporator, and a plurality of gutter-shaped members 104 for shaft fixing one by one. A connecting bar 140 connected to the portion 134 is provided. In FIG. 1, the connecting bar 140 is fixed at substantially the same height as the upper end 130 of the gutter-shaped member 104, and is fixed to the gutter-shaped member 104 in a curved state along the outer shape of the gutter-shaped member 104. However, the present invention is not limited to this. For example, the connecting bar may be fixed at another position (eg, an intermediate portion) of the gutter-shaped member 104, or by a plurality of connecting parts, near the upper end 130 of the gutter-shaped member 104 and other parts as shown in FIG. The positions may be fixed by different connecting bars.

The connecting portion 106 is composed of, for example, a metal such as iron, stainless steel, hastelloy, or titanium, and a material made of a combination thereof. The gutter-shaped member 104 may be provided with a coating known in the art such as Teflon (registered trademark), glass lining, and rubber lining in order to enhance chemical resistance.

The rotary sprinkler 100 of the present invention is arranged in the stirring tank of the evaporator and is used to spray the raw material liquid stored in the stirring tank to the heat source. By spraying the raw material liquid from the rotary sprinkler 100 to the heat source, the volatile components contained in the raw material liquid can be evaporated and separated from the raw material liquid.

In the rotary sprinkling unit 100 of the present invention, the annular base 102 can gently move the raw material liquid toward the gutter-shaped member 104 without violently stirring the raw material liquid stored in the stirring tank by rotation. As a result, it is possible to be freed from causing unnecessary droplets in the surroundings and / or greatly changing the liquid level of the stored raw material liquid up and down. In the rotary sprinkling unit 100 of the present invention, for example, when the amount of the raw material liquid stored in the stirring tank is small and the addition from the liquid surface to the stirring tank is relatively shallow, the inside of the stirring tank and / or A condenser for condensing the evaporated volatile components is installed on the outside, which is useful when you want to prevent the droplets of the raw material liquid from coming into contact with the condenser and reducing the purity of the condensed volatile components. is there.

(Evaporator)
FIG. 5 is a partial cross-sectional view schematically showing an example of the evaporator 200 of the present invention including the rotary sprinkler 100 shown in FIG.

The evaporator 200 of the present invention includes a stirring tank 202, a heat source 204, a sprinkling unit 206, and a first condenser 208.

The stirring tank 202 is a hermetically sealed tank that can contain and stir a raw material liquid composed of a liquid such as an aqueous solution or a slurry, and has, for example, a bottom portion 210 having a flat bottom or a round bottom shape.

The size (capacity) of the stirring tank 202 is not necessarily limited because it can be appropriately set depending on the application of the evaporator 200 (for example, the type of the raw material liquid to be supplied), the processing amount of the raw material liquid, and the like, but for example, 0. . 1 liter to 100,000 liters. The material constituting the stirring tank 202 is not particularly limited, but for example, iron, stainless steel because it is stable to various raw material liquids, has excellent thermal conductivity, and / or is easy to obtain and process. It is preferably composed of a metal such as steel, titanium, hastelloy or copper. The inner wall 212 of the stirring tank 202 may be coated with a coating known in the art such as Teflon (registered trademark), glass lining, and rubber lining in order to enhance chemical resistance.

The stirring tank 202 also includes a raw material liquid supply port 214, a volatile component outlet 216, and a concentrated liquid outlet 218.

The raw material liquid supply port 214 is provided, for example, above the stirring tank 202 (for example, the lid 203 of the stirring tank 202 provided above the mounting position of the rotary sprinkler 100 in the stirring tank 202). The number of raw material liquid supply ports 214 provided in the stirring tank 202 is not limited to one. For example, a plurality of raw material liquid supply ports may be provided above the stirring tank 202.

In the stirring tank 202, above the rotating shaft 228 (for example, in the vicinity of the lid 203 of the stirring tank 202 provided above the mounting position of the rotary sprinkler 100 in the stirring tank 202), there is a rotating shaft. A disk 225 attached directly to the 228 may be provided. Further, a cylindrical auxiliary wall 227 may be provided in the stirring tank 202 corresponding to the height to which the disk 225 is attached. The raw material liquid introduced from the raw material liquid supply port 214 is once arranged on the disk 225 in the stirring tank 202, and the raw material liquid on the disk 225 spreads in the radial direction with the rotation of the rotating shaft 228 from the edge of the disk 225. It is diffused. At that time, the raw material liquid diffused from the disk 225 collides with the inner surface of the auxiliary wall 227 and flows downward. The flowing raw material liquid can be sprinkled from the lower end of the auxiliary wall 227 toward the lower side of the stirring tank 202 (for example, the heat source 204). As a result, the raw material liquid discharged from the disk 225 does not scatter directly toward, for example, the inner wall 212 of the stirring tank 202, and the raw material liquid can be prevented from being accidentally moved to the volatile component accommodating compartment 220.

In FIG. 5, the volatile component outlet 216 is provided so as to communicate with the volatile component accommodating section 220 in the stirring tank 202. The volatile component storage compartment 220 extends upward from the bottom 210 (more specifically, a part of the bottom 210 of the stirring tank 202) and the inner wall 212 of the stirring tank 202, and the bottom 210 in the stirring tank 202, and is a stirring tank. It is surrounded by partition walls 222 provided at regular intervals along the inner circumference of 202, and the upper part is open. The volatile component storage compartment 220 can temporarily store volatile components (preferably liquid volatile components) contained in the raw material liquid condensed and flowed down by the inner wall 212. Further, the volatile component in the volatile component storage compartment 220 can be discharged to the outside as a condensate through the volatile component outlet 216.

In FIG. 5, the concentrated liquid outlet 218 is provided, for example, in communication with a part of the bottom 210 in the stirring tank 202. Here, the term "raw material liquid" used in the present specification refers to a (untreated) raw material liquid introduced from a raw material liquid supply port 214; at least a part of volatile components due to contact with a heat source 204 described later. Includes and refers to the residue after evaporation; as well as a mixture thereof. Further, the raw material liquid can be finally discharged as a concentrated liquid to the outside through the concentrated liquid outlet 218 after the volatile components have evaporated. The concentrate outlet 218 can control the discharge of the concentrate by opening and closing a valve (not shown) as needed. For example, in a state where the discharge of the concentrated liquid is stopped, the raw material liquid is placed in the bottom 210 of the stirring tank 202, more specifically, the bottom 210 of the stirring tank 202, the partition wall 222, and the annular base of the rotary sprinkler 100. It is temporarily stored in the raw material liquid storage compartment 225 formed inside the 102 and between the second partition wall 223 extending upward from the bottom 210.

The lid 203 of the stirring tank 202 may separately have a structure that can be opened and closed, such as a maintenance hole. Further, a pressure reducing port (not shown) may be provided on the upper part of the stirring tank 202 to reduce the pressure inside the stirring tank 202 to atmospheric pressure.

In the evaporator 200 of the present invention, the heat source 204 is arranged so as to be substantially parallel to the inner wall 212, for example, inside the stirring tank 202. In FIG. 5, the heat source 204 is made of, for example, a hollow material, and a heat medium such as steam or heat transfer oil is introduced from the outside of the stirring tank 202 through the heat medium introduction port 224, and the outer surface of the heat source 204 is introduced. The volatile component can be evaporated from the raw material liquid in contact with (heat-giving surface or heat transfer surface). When the raw material liquid comes into contact with the heat source 204, the volatile components of the raw material liquid vaporize and become a gas, which diffuses into the stirring tank 202. The heat medium that has passed through the heat source 204 is then discharged to the outside of the stirring tank 202 through the heat medium discharge port 226.

In the embodiment shown in FIG. 5, the heat applying surface (heat transfer surface) of the heat source 204 appears on both sides (that is, both the inner wall 212 side and the central axis side of the stirring tank 202). As a result, the contact area with the volatile component is increased, and the volatile component can be more efficiently evaporated from the raw material liquid. Further, since the heat source 204 is provided inside the stirring tank 202, it has an advantage that heat loss is small as compared with the case where it is provided outside, and heat retention becomes easy or unnecessary.

In the evaporator 200 of the present invention, the sprinkling unit 206 plays a role of spraying the raw material liquid stored in the bottom 210 of the stirring tank 202 onto the heat source 204 and flowing it down inside the stirring tank 202. The liquid sprinkling unit 206 includes a rotary shaft 228 and the rotary liquid sprinkler 100 attached to the rotary shaft 228. The sprinkling unit 206 uses the rotation of the motor 230 connected to the rotary shaft 228 to collect the raw material liquid stored in the bottom 210 (raw material liquid storage section 225) of the stirring tank 202 into a gutter-shaped member in the rotary sprinkler 100. It can flow from the lower side to the upper side of the stirring tank 202 through the flow path 126 provided along the length direction of 104. As a result, the raw material liquid stored in the bottom 210 (raw material liquid storage section 225) of the stirring tank 202 can be discharged from the upper end 130 of the gutter-shaped member 104 toward the upper side of the heat source 204. Then, the raw material liquid that collides with the heat source 204 falls on the surface of the heat source 204 as it is, and the raw material liquid can be sprayed. Further, the sprayed raw material liquid is promoted to evaporate the volatile component which is a contained component while flowing down from the upper side to the lower side of the heat source 204. At the same time, the residue that did not evaporate while flowing down the heat source 204 descended the heat source 204 as a concentrated liquid, and the guide 232 provided at the lower part of the heat source 204 (where, the guide 232 is in the stirring tank 202, the stirring tank said. It is stored in the bottom 210 (raw material liquid storage section 225) of the stirring tank 202 again along the partition wall 222 arranged in 202).

The rotating shaft 228 is a shaft made of a rigid metal such as iron, stainless steel, Hastelloy, and titanium, and has, for example, a cylindrical or columnar shape. The rotating shaft 228 is usually arranged in the vertical direction in the stirring tank 202. The thickness of the rotating shaft 228 is not necessarily limited, but is, for example, 8 mm to 200 mm. The length of the rotating shaft 228 varies depending on the size of the stirring tank 202 used and the like, and an appropriate length can be selected by those skilled in the art. The rotating shaft 202 may be provided with a coating known in the art such as Teflon (registered trademark), glass lining, and rubber lining in order to enhance chemical resistance.

In FIG. 5, the lower end of the rotating shaft 228 is not in contact with the bottom 210 of the stirring tank 202, and is arranged at a position at a certain distance from the bottom 210 of the stirring tank 202, for example.

In the evaporator 200 of the present invention, the rotation speed of the rotating shaft 228 suitable for pumping the raw material liquid in the stirring tank 202 (that is, the rotation speed of the sprinkling unit 206) is the constituent components of the raw material liquid, its viscosity, and stirring. It is not necessarily limited, but is, for example, 30 rpm to 500 rpmm because it varies depending on the size of the tank 202, the amount of the raw material liquid stored in the bottom 210 (raw material liquid storage section 225) of the stirring tank 202, and the like.

In the evaporator 200 of the present invention, the first condenser 208 is provided on the outer periphery of the stirring tank 202, and is preferably provided so as to continuously and closely cover the outer periphery of the stirring tank 202.

A cooling medium such as cooling water is injected into the first condenser 208 through the injection port 240, flows in the first condenser 208, and is discharged to the outside through the discharge port 242. As a result, the temperature of the cooling medium flowing in the first condenser 208 is transmitted to the inner wall 212 of the stirring tank 202, and the inner wall 212 is kept at a low temperature by the cooling medium. On the other hand, the volatile component of the raw material liquid vaporized by evaporation at the heat source 204 is cooled on the inner wall 212, condensed, and flows down on the inner wall 212 as droplets. After that, the volatile component of the raw material liquid flowing down the inner wall 212 is housed in the volatile component storage compartment 220 and discharged as a condensate to the outside through the volatile component outlet 216.

The evaporator 200 of the present invention may also be provided with a second condenser 244 inside the stirring tank 202.

In FIG. 5, the second condenser 244 is inside the rotary miracle formed by rotating the sprinkler portion 206 (that is, from the bottom 210 of the stirring tank 202 to the inside of the annular base 102 of the rotary sprinkler 100 and the stirring tank 202. A cooling medium similar to or different from the first condenser 205 (that is, from the second inlet 246 provided outside the stirring tank 202) extending upward through the second partition wall 223 provided at the bottom 210 of the above. , The cooling medium introduced in the first condenser 208 and the cooling medium introduced in the second condenser 244 may be of the same or different types, and their set temperatures may also be the same or different). be introduced. The second capacitor 244 can come into direct contact with the volatile components of the raw material liquid vaporized by evaporation at the heat source 204. When the vaporized volatile component comes into contact with the second capacitor 244, the component is cooled, condensed, and flows down onto the second capacitor 244 as droplets. After that, the liquid volatile component that has flowed down is temporarily stored in the second volatile component storage section 248 provided below the bottom 210 of the stirring tank 202. In the second component storage compartment 248, the liquid volatile component that has been decompressed through the decompression port 249 (VCM) and has flowed down is discharged to the outside as a condensate through the second volatile component outlet 250. On the other hand, the cooling medium that has passed through the second condenser 244 is discharged to the outside of the stirring tank 202 through the second discharge port 251.

According to the evaporation device 200 of the present invention, the volatile components are condensed on the inner wall 212 of the stirring tank 202, and the inner wall is not heated due to the evaporation of the volatile components as in the conventional case. Therefore, when the operation of the evaporator is stopped, for example, the stop can be performed in a relatively short time without worrying about seizure of the raw material liquid on the inner wall 212 of the stirring tank 202. The evaporator of the present invention is also easier to stop the apparatus itself than the conventional evaporator in which the inner wall in the stirring tank is passed by a single flow by "one pass", and the apparatus itself can be stopped easily. The use of raw material liquid for cooling can also be reduced.

(Evaporation system)
FIG. 6 is a diagram schematically showing an evaporation system including the evaporation device 200 shown in FIG.

The evaporation system 300 of the present invention includes a raw material tank 310 containing a raw material liquid as a raw material, and an evaporation device 200 of the present invention. Further, the evaporation system 300 shown in FIG. 6 also includes a vacuum pump 320 in addition to these.

The raw material liquid is driven by the pump 320, passes through the raw material tank 310 through the pipe 332, is temporarily preheated by a preheater (not shown) if necessary, and is fed to the evaporator 200. In the embodiment shown in FIG. 6, the heat source (not shown) in the distillation apparatus 200 is heated by supplying steam (STM) through the heat medium introduction port 224. The volatile components evaporated in the evaporation device 200 are condensed by the first and second capacitors (not shown) in the device 200 as described above. After that, the volatile component condensed in the first capacitor (more specifically, condensed in the inner wall through the first capacitor) is discharged to the outside from the pipe 334 through the volatile component outlet (216 in FIG. 5). The volatile component condensed by the second capacitor is discharged to the outside from the pipe 336 via the second volatile component outlet (250 in FIG. 5).

As described above, the evaporation system 300 of the present invention shown in FIG. 6 does not require a separate capacitor to be provided in the system configuration, and can be configured in a more space-saving manner.

The evaporator of the present invention purifies and concentrates liquids containing impurities such as methyl ester, lactic acid, fish oil, fats and oils, glycerin, etc .; water, ethanol, methyl ethyl ketone contained in chemical products such as inks, paints and chemicals. It is useful in the removal of (MEK), N-methylpyrrolidone (NMP), hexane, toluene, acetone, ethylene glycol and the like; the removal of volatile impurities from monomers and polymers used in the field of paint and resin production.

100 rotary sprinkler 102 annular base 104 gutter-shaped member 106 connecting part 108 lower end of annular base 110 upper end of annular base 112 inner surface 114 shield 118 opening 122 outer surface 126 flow path 128 lower end of giraffe member 130 Upper end 132 Bending part 134 Shaft fixing part 138 Flap-shaped member 140 Connecting bar 200 Evaporator 202 Stirring tank 204 Heat source 206 Sprinkler part 206 First condenser 210 Bottom part 212 Inner wall 214 Raw material liquid supply port 216 Volatile component outlet 218 Concentrate outlet 222 Partition 223 Second partition 225 Raw material liquid storage compartment 228 Rotating shaft 244 Second condenser 300 Evaporation system 310 Raw material tank 320 Vacuum pump 320

Claims (9)

A rotary sprinkler for spraying a raw material liquid arranged in a stirring tank of an evaporator and stored in the stirring tank to a heat source.
An annular base having an inner surface that increases in diameter from the lower end to the upper end,
A plurality of gutter-shaped members extending upward radially from a part of the circumference constituting the upper end of the annular base.
A connecting portion that connects the plurality of gutter-shaped members to each other and can be attached to the rotating shaft of the evaporator.
A rotary sprinkler. Along the inner surface of the annular base, a shielding portion is provided to control the movement of the raw material liquid from the lower end to the upper end of the annular base, and the raw material liquid is provided in the shielding portion. The rotary sprinkler according to claim 1, wherein the annular base can be moved from the lower end to the upper end through a plurality of openings. The rotary sprinkler according to claim 2, wherein the plurality of gutter-shaped members are provided corresponding to the positions of the plurality of openings of the shielding portion in the annular base portion. 1. The plurality of gutter-shaped members have a substantially arcuate flow path cross section in the length direction, and the curvature of the flow path cross section varies so as to increase from the lower end to the upper end of the gutter-shaped member. The rotary sprinkler according to any one of 3 to 3. The rotary sprinkler according to any one of claims 1 to 4, wherein the plurality of gutter-shaped members have a bent portion that bends inward in the rotational direction. It ’s an evaporator,
A stirring tank having a raw material liquid supply port, a volatile component outlet, and a concentrated liquid outlet and accommodating the raw material liquid.
A heat source provided inside the stirring tank and
A sprinkling unit provided in the stirring tank and flowing the raw material liquid into the heat source,
A first condenser provided on the outer circumference of the stirring tank and cooling the inner wall of the stirring tank,
With
An evaporator in which the sprinkling unit is composed of a rotating shaft and a rotating sprinkler according to any one of claims 1 to 5 attached to the rotating shaft. The evaporator according to claim 6, further comprising a second condenser inside the stirring tank, and the second condenser is arranged inside the rotation locus of the sprinkler portion. The evaporator according to claim 7, wherein the bottom of the stirring tank is provided with a second volatile component outlet, and the second volatile component outlet is arranged below the second condenser. A raw material tank containing the raw material liquid and
The evaporator according to any one of claims 6 to 8, which processes the raw material liquid supplied from the raw material tank.
Evaporation system.

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