JPS61174923A - Solvent recovering apparatus - Google Patents

Abstract

PURPOSE:To simplify a controlling system of the titled apparatus by providing plural adsorption vessels provided with a gas outlet valve and a steam inlet valve, plural condensers connected thereto, a gas sucking means and an apparatus separating a condensate into a solvent and water and recovering the solvent. CONSTITUTION:A solvent contained in raw gas 1 is adsorbed with an activated carbon layer 15 of an adsorption vessel 2-1 in an adsorption process and the purified gas is discharged through an exhaust line 7. On the other hand, steam is introduced into an adsorption vessel 2-2 in a desorption process via a steam inlet valve 10-2 through a steam line 9 to desorb the solvent and it is introduced into a condensor 102 via a line 105 to make it a condensate, flowed out to a discharge line 12, cooled with an after-cooler 106 and the recovery of the solvent and the discharge of water are performed in a separator 14. The desorption commands are performed by a timer or a gas sensor or the like and the adsorption and the desorption are alternately performed.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an apparatus for recovering solvents, particularly organic solvents.

(Prior art) In general, an adsorption method using intermolecular attraction as a collecting means is often used as a method for efficiently recovering solvents from gas containing a low concentration of solvent (hereinafter referred to as raw gas), and activated carbon is used as an adsorbent. is used. The activated carbon adsorption method consists of a step in which solvents such as hydrocarbons, alcohols, ketones, and esters are adsorbed onto activated carbon from exhaust gas at room temperature, and a desorption step in which steam, heated gas, etc. are used.

As mentioned above, the activated carbon adsorption method is the most common organic solvent treatment method, and the direct steam desorption method using a fixed adsorption tank is the most popular solvent recovery method. Many of these systems are designed to reduce pollution and focus on pollution, and there is a demand for equipment that is cheaper and simpler than conventional equipment.

By the way, as a solvent recovery device, one shown in FIG. 3 is generally known. That is, 1 in the figure is raw gas,
This raw gas 1 is guided to the adsorption tank 2-1゜2-2 through a gas blower 3 for guiding it to the adsorption tank 2-1゜2-2 and a gas cooler 4 for cooling the raw gas 1i. There is.

This adsorption tank 2-1.2-2 has 5 adsorption lines per cypress.
A gas inlet valve 6-1 provided in the exhaust line 7, a gas outlet valve 8-1 provided in the exhaust line 7, and a steam inlet valve 10-1 and a steam outlet valve 11-1 provided in the steam line 9 are included. has been done. These valves open (or close) the gas inlet valve 6-1 and outlet valve 8-1 of the adsorption tank 2-1, and open (or close) the steam inlet valve 10-1 and the outlet valve, based on instructions from a timer connected to the controller, for example. Close (or open) the valve 11-1, close (or open) the gas inlet valve 6-2 and outlet valve 8-2 of adsorption [2-2, and close (or open) the steam inlet valve 10-2 and outlet valve 11-2'. ii open (or close)
After repeated adsorption and desorption, the desorbed solvent and water vapor distillate are transferred to the condenser 1 installed in the discharge line 12.
3. The solvent is introduced into the separator 14, where the solvent is recovered and drained.

In such a solvent recovery apparatus, as described above, each time adsorption or desorption is performed, the gas inlet valve 6-1.6-2, the gas outlet valves 8-1, 8-2, and the steam inlet valve 10-1.10- 2. The automatic switching system is complicated because the steam outlet valves 11-1 and 11-2 are automatically switched via a controller (not shown). In addition, troubles occur in the operation of the valve body, problems in the working air system, and problems such as leaks due to corrosion or blockage of the gas inlet valves 6-1, 6-2 and steam outlet valves 11-1, 11-2 due to solvents are likely to occur. It had some defects.

Note that 15 in the figure is an activated carbon layer.

(Problems to be Solved by the Invention) The present invention has been made to solve the above-mentioned problems, and its purpose is to reduce the number of valves, simplify the complex control system, and reduce equipment costs. The purpose of the present invention is to provide a solvent recycling device that is inexpensive and easy to manage.

(Means for Solving the Problems) That is, the present invention provides a plurality of suction pipes including activated carbon for adsorbing a solvent and having gas outlet valves and steam inlet valves connected to the plurality of adsorption tanks and mutually connected to each other. The raw gas is sucked into a plurality of condensers connected to the condenser, and the raw gas is guided to the communication line of the condenser. This is a solvent recovery device characterized by comprising a device.

The present invention can be advantageously applied as a solvent-containing gas treatment device.

(composition) The apparatus of the present invention is shown in FIG. 1 below.

In Fig. 1, 1 is the raw gas, 2-1 and 2-2 are adsorption tanks, 3 is a gas blower, 5-wire adsorption line, 7 is an exhaust line,
8-1, 8-2 are gas outlet valves, 9 is a steam line, 10
-1.10-2 is a steam inlet valve, 12 is a discharge line, 14
15 indicates a separator, and 15 indicates an activated carbon layer, which is the same as the conventional example shown in FIG. 101 and 102 are condensers, 103 is a communication line, and 104 and 105 are raw gas 1
and solvent-containing vapor inlet and outlet lines, 106 representing an aftercooler.

Adsorption tank 2-1.2-2 The IC is installed in an activated carbon layer 15 that adsorbs and collects a good solvent contained in the raw gas 1, an exhaust line 7 that releases the purified gas to the entire atmosphere, and this exhaust line 7. Gas outlet valve 8- which opens during adsorption and closes during desorption.
1, 8-2 and steam inlet valve 10-1, 10-2 during installation and removal.
A steam line 9 is provided for introducing water vapor into the adsorption tank through a steam line 9, and is connected to condensers 101 and 102, which will be described later, through lines 104 and 105', respectively. The condensers 101 and 102 are connected to each other by a communication line 103, and are provided with inflow and outflow lines for water to condense water vapor containing a solvent during desorption.

(Function) Next, the function of the device of the present invention will be explained based on FIGS. 1 and 2. As shown in FIG. 2, one of the adsorption tanks 2-1 and 2-2 is in the adsorption process and the other is in the desorption process from the beginning of operation. Now, as shown in FIG. 1, the gas outlet valve 8-1 of the adsorption tank 2-1 is open, the steam inlet valve 10-1 is closed and the adsorption process is in progress, and the gas outlet valve 6 of the adsorption tank 2-2 is closed. -2 is closed, steam inlet valve 1
0-2 is open and in the desorption process.

The steam entering the adsorption tank 2-2 through the steam line 9 and the steam inlet valve 10-2'i enters the condenser 102 along with the solvent through the line 105, where it is condensed into a condensate), and the discharge line 12. The solvent flows out to the aftercooler 106, where it is cooled, and the separator 14 collects and drains the solvent. In addition, the raw gas 1 cannot enter the condenser 102 filled with steam, and is routed from the communication line 103 to the condenser 101 line 10.
4, enters the adsorption tank 2-1, and the activated carbon layer 15 adsorbs and collects the solvent, and the purified exhaust gas is discharged from the exhaust line 7. Note that the desorption command is issued by a timer, exhaust gas detection, etc., and adsorption and desorption are performed alternately.

(Effects) That is, according to the solvent gas treatment apparatus of the present invention, by eliminating the need for the gas inlet valve and the steam outlet valve, the gas outlet valve 8-1.8-2 and the steam inlet valve 10-1. Continuous processing is possible by switching 1Q-2, and the automatic switching system is simplified. In particular, corrosion caused by solvents and troubles due to blockage are eliminated, making waste management easier.

Note that it is also possible to use the condenser job 102 together with a raw gas tank (not shown).

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an outline of the apparatus of the present invention, FIG. 2 is a chart showing the correspondence during adsorption/desorption operations of two adsorption tanks, and FIG. 3 is a diagram showing an outline of a conventional apparatus. Sub-agents 1) Meikoku agent Ryo Hagiwara - Figure 1 Figure 2 Exhaust Exhaust

Claims (1)

[Claims] A plurality of adsorption tanks are provided with activated carbon for adsorbing and collecting solvents, each having a gas outlet valve and a steam inlet valve, and a plurality of condensers connected to the plurality of adsorption tanks and communicated with each other, sucking the raw gas;
A suction means leading to a communication line of the condenser and separating the condensed liquid condensed through the condenser during desorption into a solvent and water;
A solvent recovery device characterized by comprising a means for recovering.