JP2014125661A - Treatment container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment container which is provided with a jacket and whose inner wall surface is coated with enamel and which can prevent corrosion of the jacket.SOLUTION: A wall part 3a of a jacket 3 is provided with an opening 3b, and the opening 3b is connected to an opening on one end 14a side of a tubular member 14 to communicate an internal space of the jacket 3 with the outside through the tubular member 14. A lid body 15 is detachably provided to the other end 14b of the tubular member 14. When the lid body 15 is mounted to the other end 14b of the tubular member 14, a sacrificial anode 16 is fixed to the side facing the internal space of the jacket 3.

Description

  The present invention relates to a processing container that accommodates an object to be processed.

  In the production and purification processes of various compounds, each unit operation such as absorption, extraction, distillation and drying is performed by continuous processing or batch processing. Further, each unit operation is performed using a processing apparatus of a type corresponding to the unit operation, such as a tank-type apparatus and a tower-type apparatus.

  The tank type apparatus can be used for both continuous processing and batch processing, and can be widely used for mixing, dispersing, heating and cooling.

  In the heating / cooling operation in the tank apparatus, the object to be processed is accommodated in the container, and the heating means or the cooling means arranged outside the container is operated to heat or cool the object to be processed in the container. The heating means or cooling means is provided with, for example, a mantle heater or a jacket-type temperature control device (hereinafter simply referred to as “jacket”).

  Moreover, since various compounds are used as the object to be stored in the container depending on the content of the process, the container may be corroded by the object to be processed. Therefore, the inner wall surface of the container is subjected to anticorrosion treatment for preventing corrosion. Examples of the anticorrosion treatment include enamel coating treatment (glass lining treatment). A container subjected to a glass lining treatment is described in Patent Document 1 and the like.

Japanese Patent Publication No.62-48778

  About the inner wall surface of a container, since the anticorrosion process by glass lining (enamel coating) is given like patent document 1, it can be used over a long period of time. On the other hand, when using a jacket as a temperature adjusting device, if the jacket itself corrodes due to the heat medium flowing in the jacket, it is necessary to stop the operation of the processing vessel, such as replacing the jacket, Efficiency is reduced.

  An object of the present invention is to provide a processing container that is provided with a jacket and in which the inner wall surface of the container is coated with an enamel coating and can prevent corrosion of the jacket.

The present invention is a container main body for storing an object to be processed, the container main body having an inner wall coated with an enamel,
A jacket which is arranged so as to surround the container body and which heats or cools the container body, and which is made of a metal material having an internal space for allowing a heat medium for heating or cooling to flow;
A sacrificial anode made of a metal material having a larger ionization tendency than the metal material, the sacrificial anode being in contact with a heat medium flowing through the internal space and electrically connected to the jacket. Processing container.

Further, the present invention provides a tubular member that is provided in the jacket and communicates the internal space with the outside.
A lid that is detachably provided on the tubular member, and that shuts off the internal space and the outside when mounted;
The sacrificial anode is fixed to the inner space side of the lid.

  In the present invention, the metal material constituting the jacket is iron, and the metal material constituting the sacrificial anode is at least one of zinc, magnesium, aluminum, and alloys thereof.

  According to the present invention, the inner wall of the container main body that accommodates an object to be processed is subjected to anticorrosion measures by enamel coating. The jacket is disposed so as to surround the container body, and heats or cools the container body. The jacket is made of a metal material and has an internal space for allowing a heat medium for heating or cooling to flow through.

  A sacrificial anode made of a metal material having a higher ionization tendency than the metal material is in contact with the heat medium flowing through the internal space and is electrically connected to the jacket.

  Accordingly, the jacket can be prevented from being corroded by the galvanic anode method instead of the enamel coating.

  Further, according to the present invention, a tubular member provided in the jacket and communicating the internal space with the outside, and a lid body detachably provided on the tubular member and blocking the internal space and the outside when mounted. Is further provided. The sacrificial anode is fixed to the inner space side of the lid.

  Thereby, for example, a sacrificial anode can be easily provided using an existing inspection port or the like, and a new sacrificial anode can be easily replaced.

  According to the present invention, since the jacket is made of carbon steel, mainly iron, zinc, magnesium, aluminum and alloys thereof can be used as the metal material constituting the sacrificial anode.

It is the schematic which shows the processing container 1 which is embodiment of this invention. It is an enlarged view of the inspection port 13 provided with the sacrificial anode 16.

  FIG. 1 is a schematic view showing a processing container 1 according to an embodiment of the present invention.

  The processing container 1 includes a container main body 2 that accommodates an object to be processed and a jacket 3 that covers the outer peripheral surface of the container main body 2. In this embodiment, the to-be-processed object accommodated in the container main body 2 is a multiple types of liquid raw material, and obtains a reaction product by the chemical reaction of raw materials. In order to promote the reaction, the container body 2 is heated by the jacket 3 and the liquid raw material is adjusted to a predetermined temperature. Furthermore, the raw materials in the reaction are stirred by the stirrer, and the raw materials are uniformly mixed and dispersed in the container body 2.

  The container body 2 is provided with a raw material supply port 8 and a product outlet 9. The container body 2 is provided in a substantially cylindrical shape, and is installed such that the axis is parallel to the vertical direction. Further, the container body 2 is provided with a stirrer 12 including a rotation shaft 10 and a stirring blade 11, and the rotation shaft 10 is provided coaxially with the axis of the container body 2. A liquid raw material was introduced into the container body 2 from the raw material supply port 8, and the rotating shaft 10 was rotated around the axis line at least one of before the start of the reaction, during the reaction, and after the end of the reaction. The liquid raw material and reaction product accommodated by rotating the stirring blade 11 are stirred. After completion of the reaction, the generated reaction product is taken out from the product outlet 9 provided at the lower part of the container body 2.

  The jacket 3 is covered from the outer peripheral surface to the bottom surface of the container main body 2 and adjusts the temperature of the liquid raw material and the like contained in the container main body 2 and the internal space of the container main body 2 by the heat medium flowing in the jacket 3. When the temperature of the heat medium flowing in the jacket 3 is higher than that of the container main body 2 and the liquid raw material accommodated, heat is exchanged between the high-temperature heat medium and the wall of the container main body 2 to transfer heat to the wall. And the temperature of the wall rises. Furthermore, heat exchange is performed between the wall portion and the liquid material whose temperature has increased, and heat transfer to the liquid material occurs, so that the temperature of the liquid material increases. Since the heat medium in the jacket 3 is deprived of heat by the wall and the temperature is lowered, in order to raise the temperature of the liquid raw material to the target temperature, the heat medium having the lowered temperature is discharged and the high-temperature heat medium is removed. It is necessary to introduce a new one. The jacket 3 is provided with an inflow port 5 and an outflow port 6 for exchanging the heat medium, and further, a discharge port 7 for extracting the heat medium from the jacket 3 after use is provided below the jacket 3.

  As the heat medium, an aqueous medium such as hot water, cold water, or steam is used according to the target temperature, and a brine such as 24% calcium chloride brine or 50% ethylene glycol is also used.

  The container body 2 and the jacket 3 are made of a material such as carbon steel, and the inner wall surface of the container body 2 is subjected to anticorrosion treatment by enamel coating (hereinafter also referred to as glass lining treatment).

  Glass lining treatment is an anticorrosion treatment that forms a coating layer that is combined with the base material by baking the glass on a metal base material such as carbon steel, and has the characteristics of glass such as good cleanability and good corrosion resistance. It can be applied to a metal base material.

  When the glass lining treatment is not performed, the inner wall surface of the container main body 2 is in a state where the carbon steel is exposed, so that it is easily corroded by the liquid raw material accommodated. Further, since the jacket 3 is also made of the same carbon steel as the container main body 2 and the medium as described above is used as a heat medium, it is corroded unless some anticorrosion treatment is applied.

  As the anticorrosion treatment for the jacket 3, glass lining treatment can be considered as in the case of the container body 2. However, since the thermal conductivity of the glass is as small as one tenth of the thermal conductivity of the metal base material, the heat medium to be used is used. Depending on the type of metal and the type of metal base material, the heat exchange efficiency may be greatly reduced. Therefore, the jacket 3 is subjected to cathodic protection by a galvanic anode method using a sacrificial anode with respect to the glass-lined container body 2.

  In the galvanic anode-type anticorrosion, a metal to be subjected to anticorrosion, in this embodiment, carbon steel (that is, iron) is used as a cathode, and a metal having a higher ionization tendency than iron, such as aluminum, zinc, magnesium, and alloys thereof are used. The sacrificial anode is used to prevent ionization of iron by ionizing the anode metal.

  The galvanic anode method does not require a DC power supply as in the case of an external power supply method. If the sacrificial anode and the metal (cathode) that is subject to anticorrosion are electrically connected, an electrolyte such as a heat medium is used. Since the anticorrosion current flows between the two electrodes, it is possible to prevent the ionization of the cathode, so that the existing equipment can be easily added.

  In order to exhibit such cathodic protection, the sacrificial anode naturally needs to be in contact with the heat medium. Therefore, for example, by providing the sacrificial anode so as to protrude into the jacket 3, the sacrificial anode can be brought into contact with the heat medium flowing through the jacket 3.

  The shape, size, etc. of the sacrificial anode can be appropriately set, but the sacrificial anode itself is ionized and eluted in the heat medium as described above, so that it is consumed over time, Some size is required.

  The installation position of the sacrificial anode is not particularly limited, but is preferably provided at a position that does not hinder the flow of the heat medium flowing through the jacket 3. When the flow of the heat medium is hindered, heat exchange is not sufficiently performed in the vicinity of the sacrificial anode, causing uneven heating and uneven cooling, which may reduce the yield of the reaction product.

  Therefore, a tubular portion protruding outward from the wall portion of the jacket 3 is provided, and a sacrificial anode having a volume substantially the same as the internal space of the tubular portion is disposed inside the tubular portion. As a result, the inner surface of the sacrificial anode can be provided at substantially the same position as the inner surface of the wall portion of the jacket 3, so that the sacrificial anode can be sufficiently brought into contact with the heat medium without obstructing the flow of the heat medium flowing through. can do.

  Such a tubular portion may be provided for the installation of the sacrificial anode, but the jacket 3 is usually connected to the inside and the outside of the jacket 3 in order to inspect the inside of the jacket 3 or to clean the inside. Is provided with an inspection port 13 that communicates with each other. The inspection port 13 includes a tubular member protruding outward from the wall portion of the jacket 3 and a lid for closing the opening of the tubular member. By attaching the sacrificial anode to the inside of the lid, the sacrificial anode can be arranged at a suitable position. In addition, as an arrangement position suitable for providing the sacrificial anode, there is a cleaning port in addition to the inspection port. The cleaning port is provided for cleaning the inside of the jacket 3 and has the same structure as the inspection port except for the size and the position of the cleaning port.

  FIG. 2 is an enlarged view of the inspection port 13 provided with the sacrificial anode 16.

  The inspection port 13 includes a tubular member 14 and a lid body 15. The tubular member 14 is formed in a right cylindrical shape, and the lid body 15 is formed in a disk shape.

  The wall 3 a of the jacket 3 is provided with an opening 3 b, connected to the opening on the one end 14 a side of the tubular member 14, and the inner space of the jacket 3 communicates with the outside through the tubular member 14. A lid 15 is detachably provided at the other end 14b of the tubular member 14. The lid body 15 has a diameter larger than the opening diameter of the opening on the other end portion 14b side in order to close the opening on the other end portion 14b side of the tubular member 14 and block the interior space of the jacket 3 from the outside when mounted. It consists of a disk-shaped member.

  The lid 15 is fixed to the other end 14b of the tubular member 14 by screwing or fastening with a bolt and nut. In the case of screwing, for example, as shown in FIG. 2, a plurality of female screws 17 opening on the end surface on the other end portion 14 b side of the tubular member 14 are provided, and the lid 15 has a through hole 18 at a position corresponding to the female screw 17. The lid 15 is fixed to the other end 14 b of the tubular member 14 by inserting the male screw 19 through the through hole 18 and screwing the male screw 19 into the female screw 17. In the case of fastening with bolts and nuts, a flange is provided at the other end 14 b of the tubular member 14, and through holes are provided in the flange and the lid body 15, respectively. Bolts are inserted through the through-holes of the flange and the through-holes of the lid 15 and fastened with nuts.

  The sacrificial anode 16 is fixed to such a lid 15. The sacrificial anode 16 is fixed to the side facing the internal space of the jacket 3 when the lid 15 is attached to the other end 14 b of the tubular member 14. When the jacket 3 is used, since the lid 15 is attached to the tubular member 14, the sacrificial anode 16 is exposed to the internal space of the jacket 3 during that period, and heat is generated when the heat medium flows through the internal space. The medium and the sacrificial anode 16 come into contact.

  The sacrificial anode 16 is formed in a disk shape or a cylindrical shape, and a through hole 16a for attachment is provided near the center. The lid 15 is provided with a bolt 20 extending toward the inner space. The bolt 20 is inserted into the through hole 16 a of the sacrificial anode 16, and the sacrificial anode 16 is fixed with a nut 21.

  The tubular member 14, the lid 15, the male screw 19, the bolt 20 and the like are made of the same carbon steel as the jacket 3 or at least a metal material, and the attached sacrificial anode 16 and the jacket 3 are electrically connected. When the heat medium flows, the metal of the sacrificial anode 16 having a larger ionization tendency than iron, for example, zinc, is ionized and eluted into the heat medium, and electrons generated by the ionization of zinc are the bolt 20, the lid 15, and the male screw 19. , Flows through the tubular member 14 to the jacket 3. As a result, the iron of the jacket 3 is prevented from being ionized, and galvanic anode-type cathodic protection can be realized instead of glass lining.

  Since the sacrificial anode 16 is fixed only to the lid 15, the sacrificial anode 16 can be easily taken out by detaching the lid 15 from the tubular member 14. Further, the sacrificial anode 16 can be replaced only by removing the used sacrificial anode 16 from the lid 15 and fixing a new sacrificial anode 16.

  It is possible to provide a dedicated insertion port in the jacket 3 so that the sacrificial anode 16 is exposed in the internal space of the jacket 3. However, when a new sacrificial anode 16 is to be attached to the existing jacket, a dedicated insertion port is provided. It is necessary to make a major remodeling such as newly installing. If the inspection port 13 is used, the sacrificial anode 16 can be easily attached by modification only by fixing the bolt 20 to the lid 15.

  Furthermore, a spacer made of an insulating material such as a fluororesin (for example, PTFE (polytetrafluoroethylene)) may be sandwiched between the lid 15 and the sacrificial anode 16. Providing the spacer prevents direct contact between the sacrificial anode 16 and the inner surface of the lid 15, and the sacrificial anode 16 and the lid 15 are electrically connected via the fixing bolt 20.

  In order to confirm the effect of the cathodic protection by the sacrificial anode, the following test was performed. As the sacrificial anode, a sacrificial anode made of a cylindrical material having a through hole (diameter 95 mm, thickness 25 mm) was used. A jacket made of carbon steel was used.

  A long jig made of SUS304 is fixed in a cantilevered state to the surface of the lid facing the inner space of the jacket, and a continuity test piece and an insulation test piece are provided on the free end side extending near the center of the inner space of the jacket. Attached. Each of the two test pieces is made of a carbon steel disk (diameter 45 mm, thickness 2.2 mm). One test piece as a continuity test piece is brought into electrical contact with the long jig directly on the free end side, and the other test piece is insulated with PTFE between the long jig as an insulation test piece. The body was sandwiched and electrically insulated.

  In the inner space of the jacket, −15 ° C. calcium chloride brine (concentration: 24% by weight) and 7 ° C. cold water were allowed to flow as continuous heat for 720 hours.

  In the evaluation, the corrosion rate of the continuity test piece and the insulation test piece was measured. Here, the corrosion rate was determined as the weight loss per unit area and unit time by measuring the weight of each test piece before the test and the weight after the test, calculating the weight loss. The results are shown in Table 1.

  The continuity test piece was able to keep the corrosion rate small compared to the insulation test piece. This is considered that the sacrificial electrode was ionized by the flow of the anticorrosion current between the continuity test piece and the sacrificial electrode via the long jig, and the ionization of the continuity test piece was prevented.

DESCRIPTION OF SYMBOLS 1 Processing container 2 Container main body 3 Jacket 13 Inspection port 14 Tubular member 15 Cover body 16 Sacrificial anode

Claims (3)

A container body containing an object to be processed, the container body having an enamel-coated inner wall;
A jacket made of a metal material, which is disposed so as to surround the container body and which heats or cools the container body, and has an internal space for allowing a heat medium for heating or cooling to flow through;
A sacrificial anode made of a metal material having a larger ionization tendency than the metal material, the sacrificial anode being in contact with a heat medium flowing through the internal space and electrically connected to the jacket. Processing container. A tubular member provided in the jacket and communicating the internal space with the outside;
A lid that is detachably provided on the tubular member, and that shuts off the internal space and the outside when mounted;
The processing container according to claim 1, wherein the sacrificial anode is fixed to the inner space side of the lid.   3. The metal material constituting the jacket is iron, and the metal material constituting the sacrificial anode is at least one of zinc, magnesium, aluminum, and alloys thereof. Processing container.

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