JPS6363241B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for concentrating and drying liquid substances, and more particularly to a concentrating and drying method suitable for treating aqueous or organic solvent-based liquid substances containing various organic and inorganic substances.

Wastewater generated from manufacturing plants such as chemical factories and pharmaceutical factories contains water-based or organic solvent-based liquid substances that contain large amounts of various organic and inorganic substances that cannot be treated with general wastewater treatment methods such as the activated sludge method. There is. This type of liquid substance cannot be disposed of as is, so it is treated by some means such as incineration, but if it is organic solvent-based, organic solvents are used on the premise of effective reuse. recovering all volatile components such as solvents;
In addition, it is required that non-volatile components such as organic and inorganic substances remaining after volatile component recovery be in a solid state that is easy to handle, and that maintenance and management throughout the entire process be as easy and economical as possible.

Conventionally, there are the following methods for treating this type of liquid substance. Most commonly, using a sleeve heat exchanger or a plate heat exchanger,
There is a method of heating and evaporating a liquid substance and then separating and concentrating the evaporated volatile component vapor in a gas-liquid separator. However, due to its nature, this conventional method leaves a portion of the volatile components and can only be carried out within the range where a certain degree of sufficient fluidity can be obtained in the liquid substance, so it is inevitably impossible to recover the entire amount of volatile components. It is. Additionally, as the volatile components evaporate from the liquid substance, the concentration of mixed organic and inorganic substances gradually increases, causing these organic and inorganic substances to stick together,
Phenomena such as polymerization, adhesion, and deposition occur, and as non-volatile components such as organic and inorganic substances adhere to the heat transfer surface of the heat exchanger as described above, the heat transfer efficiency is significantly reduced. Furthermore, the user is forced to perform the troublesome work of scraping off the attached non-volatile components. Another conventional method is to use a scraping bladed thin film falling evaporator to flow the liquid material down onto a heat transfer surface that has mechanical scraping blades inside the jacketed body.
According to this conventional method, the reduction in heat transfer efficiency of the heat transfer surface can be prevented to some extent by using mechanical scraping blades, but once the strong non-volatile components adhere to the heat transfer surface, there is no way to remove it, and the viscosity increases. In the case of certain non-volatile components, there are problems such as adhesion to the scraping blade and growth, and in addition, there is a drawback that a precisely manufactured and expensive equipment and stirring power of the scraping blade are required. Still another conventional method uses a fluidized bed drying incinerator, in which hot air is introduced from the bottom of the main body filled with solid particles to fluidize the solid particles and introduce liquid substances into them. There is a method of injecting it and burning it. However, in this conventional method, since the entire amount is combusted, volatile components cannot be recovered, and a huge amount of equipment is required, making it extremely uneconomical.

The present invention solves the above-mentioned conventional drawbacks and provides an improved method for concentrating and drying liquid substances that meets the above-mentioned demands. Using a large number of solid particles sized within a certain range under indirect heating that allows free movement of organic solvent-based liquid substances, volatile components such as organic solvents are evaporated and recovered, while non-volatile components are recovered. By concentrating, drying, pulverizing and continuously discharging, the entire amount of volatile components can be recovered if necessary, and the non-volatile components can be made into a solid form that is easy to handle, and maintenance management throughout the entire process is easy and economical. It is in.

Hereinafter, the configuration of the present invention will be explained in detail based on the drawings.

FIG. 1 is a schematic side view including a partial cross section illustrating one implementation procedure of the present invention, and FIG. 2 is an enlarged schematic cross-sectional view illustrating the implementation state. A closed system hollow container 11 having a substantially cylindrical shape and having a jacket 12 on the outer periphery in which a heat medium can be circulated is equipped with one to several vibration generating sources 15 firmly fixed, and a spring 14 is attached to a base 13. , 24, 34, 44 (however, 3
4 (not shown), so that the movement of the vibration source 15 provides a certain kind of free movement. The inside of the closed hollow container 11 is preferably filled with 10 to 75% by volume of a large number of solid particles 16 sized to several meshes to several tens of meshes, and a supply port 17 is provided on the top side. A supply pipe 27 is drilled to this supply port 17.
Four liquid dispersers 17a, 17 connected via
b, 17c, and 17d are positioned inside the closed hollow container 11.

In the case of the drawing, the closed system hollow container 11 has a horizontal cylindrical shape, but it may also have a solid cylindrical shape as illustrated in FIG. Vessel 17a
Although four units of 17d are used, this type of liquid dispersion device is not limited, and depending on the properties of the liquid substance to be treated, for example, an atomization method may be used. The number of attachments may be one to several. And a closed system hollow container 1
The solid particles 16 filled inside 1 are made of silica sand, ceramic particles, metal particles with good thermal conductivity, etc., and these particles are sized within a certain range of, for example, about 7 to 20 meshes.

On the other hand, an exhaust port 37 is provided on the top side of the closed system hollow container 11.
A receiver 28 is connected to the exhaust port 37 via the condensation port 18, and an outlet 47 is provided in the side surface 11a of the closed system hollow container 11, and a receiver 38 is connected to the exhaust port 47. At the same time, a separation member 19 is provided between the side surface 11a and the cylindrical main body 11b.
It is installed so that it is held in place.

As will be described later, the separation member built in the closed system hollow container and configured integrally therewith condenses and pulverizes the solid particles 16 filled therein and the non-volatile components in the supplied liquid material. This device separates the finely divided solids and allows only the finely divided solids to pass through and discharge them out of the closed system hollow container.In addition to the separation member 19, the following structure may be used as appropriate.
For example, as shown in FIG. 3, which is a partially omitted cross-sectional view, a discharge pipe 57a is formed to protrude inward from a discharge port 57 bored in the side surface 21a of the closed system hollow container 21, and its tip end curved separation member 2
9 is fixed, and for example, as shown in FIG. 4, which is a partially omitted cross-sectional view, it is perforated in the bottom side of the closed system hollow container 31, including the side surface 31a. The discharge port 67 is connected to the small chamber 67a.
For example, as shown in FIG. 5, which is a partially omitted cross-sectional view, the bottom surface 41a of the closed system hollow container 41 is bored. A small cylindrical body 77a with a closed end is formed to protrude inward from the discharge port 77, and the middle part of the small cylindrical body 77a is used as the separation member 49.

These separation members 19, 29, 39, 49 are
A large number of small circular holes 10 are bored as shown in FIG. 6, which is a partially enlarged plan view, in order to allow only the crushed fine solids to pass through, and FIG. 7, which is a partially enlarged plan view. A wire mesh having a large number of rectangular narrow slits 20 as shown in FIG. 8, or a wire mesh having a large number of rectangular small holes 30 as shown in FIG. The small hole 10 and the narrow slit 20 are
In order to prevent clogging in this portion, it is preferable to have a shape that widens toward the end in the direction in which the fine solid particles pass, as shown in FIG. 9, which is a partially enlarged sectional view of the portion.

Next, more detailed contents of the present invention will be explained based on FIGS. 1 and 2. When the vibration source 15 is driven to apply approximately circular vibration to the closed hollow container 11, a large number of solid particles 16 filled inside the container are
As shown by arrow A in the figure, the particles enter a stirring or mixing state in which violent collisions occur repeatedly between the particles while vibrating and rotating in a substantially circular shape. On the other hand, when the wall surface of the closed hollow container 11 is heated by circulating steam or a commercially available liquid heat medium through the jacket 12, the solid particles 16 are subsequently heated to approximately the same temperature as the heat medium. . Heat conduction, which is the main source of heating at this time, is extremely efficient because the solid particles 16 repeatedly collide violently while vibrating and rotating. In this state, when a liquid substance is dispersed and injected from the liquid dispersers 17a to 17d through the supply port 17, the liquid substance comes into contact with the surface of the solid particles 16, and the volatile components in the liquid substance evaporate almost instantly. and distill it off from the exhaust port 37. At this time, depending on the properties of the liquid substance, the atmosphere inside the closed hollow container 11 may be operated in a reduced pressure state or a pressurized state. The vapor of volatile components distilled off from the exhaust port 37 is condensed at the condensation port 18, collected in the receiver 28, and reused as appropriate. The nonvolatile components in the liquid substance remaining after the volatile components evaporate temporarily adhere to the surfaces of the solid particles 16, but since the solid particles 16 repeatedly collide violently with each other,
It is immediately removed from the solid particles 16, dispersed and pulverized into fine solid particles. Therefore, the solid particles 16 constantly repeat self-cleaning, so to speak, and are in a state where they can be most efficiently treated with the liquid substance that is continuously dispersed and injected. Thus,
The fine solid particles concentrated, dried and pulverized from the liquid substance are separated from the solid particles 16 by the separation member 19, continuously discharged from the discharge port 47, and collected in the receiver 38. Due to its nature, the recovered fine solid particles are easy to handle and can be used for other purposes, and may be ultimately disposed of by landfilling, incineration, or the like.

As explained above, the present invention is applicable to the treatment of aqueous or organic solvent-based liquid materials containing various organic substances and inorganic substances, if necessary, while recovering the entire amount of volatile components and minimizing non-volatile components. It has the advantage of being in a solid form that is easy to handle, and that the processing itself can be carried out economically with easy maintenance management.

Example A horizontal cylindrical steel product with an internal volume of approximately 0.66 m ³ as a closed system hollow container, silica sand sized to 7 to 20 meshes as solid particles, and a wire mesh with a reinforcing frame of 40 meshes as a separating member were used. I configured the line as shown in the figure. First, a closed hollow container is filled with 50% solid particles by volume, and a vibration generation source is driven.
Steam at 150°C was circulated around the outer jacket.
Next, when the temperature of the solid particles in the closed hollow container was almost uniform, waste thinner used for cleaning the paint was continuously dispersed and injected at a rate of 100 per hour for 24 hours. During the process, the entire amount of organic solvent was continuously recovered in an almost uniform manner, while a condensed, dry and ground fine brown solid, odorless and extremely easy to handle, was continuously discharged, which was the desired result.

[Brief explanation of drawings]

Fig. 1 is a schematic side view including a partial cross section illustrating one implementation procedure of the present invention, Fig. 2 is an enlarged schematic sectional view illustrating the implementation state, and Figs. 3 to 5 are separation members. 6 to 8 are partially enlarged plan views illustrating the separation members individually, and FIG. 9 is a partially enlarged sectional view illustrating the separation members. . 11, 21, 31, 41...closed hollow container,
12...jacket, 13...base, 14,2
4, 44... Spring, 15... Vibration source,
16...solid particles, 17...supply port, 37...exhaust port, 47, 57, 67, 77...discharge port, 18
... Condenser, 28, 38 ... Receiver, 19, 29,
39, 49...separation member.

Claims (1)

[Claims] 1. Particles sized to several meshes to several tens of meshes under indirect heating with free movement in a closed system hollow container equipped with an exhaust port and a discharge port and containing a separating member. A liquid substance is continuously dispersed and injected onto the surfaces of a large number of solid particles from a liquid disperser inserted in the closed system hollow container, and the volatile components of the liquid substance are almost instantaneously evaporated from the exhaust port. A method for concentrating and drying a liquid substance, characterized in that non-volatile components are condensed and dried while pulverized, and only the pulverized fine solids are passed through the separation member and continuously discharged from the discharge port. 2. Concentration and drying of a liquid substance according to claim 1, wherein a large number of small holes or slits are formed in the separating member, and the small holes or slits widen toward the end in the direction of passage of the fine solid particles. Method.