CN101825220B - DMF gas recovery device - Google Patents

Abstract

The invention discloses a DMF gas recovery device, which has an exhaust pipe for collecting DMF gas. One end of the exhaust pipe is connected with a DMF storage tank, and the other end of the exhaust pipe extends into an absorption liquid tank. There is a drier between the gas pipes, a return pipe connected to the rectification system on the absorption liquid tank, and a water storage tank for storing the absorption liquid near the absorption liquid tank, and the drain pipe of the water storage tank extends into the absorption liquid In the tank, there is also a control system for controlling the discharge and replenishment of the absorbing liquid on the absorbing liquid tank. The present invention is simple in structure, convenient to manufacture, and low in cost, and utilizes the characteristics of DMF being very soluble in water to fully absorb DMF gas for recycling. It not only solves environmental problems, but also reduces potential safety hazards, and saves production materials.

Description

A kind of dimethylformamide gas recovery device

technical field

The invention relates to a gas recovery device, in particular to a DMF gas recovery device used for volatilization in DMF storage tanks and waste water storage tanks. the

Background technique

Dimethylformamide (DMF) is an important chemical raw material and a solvent with excellent performance. Dimethylformamide is not only a chemical raw material with a wide range of uses, but also an excellent solvent with a wide range of uses. In organic reactions, Dimethylformamide is widely used as a reaction solvent, but it is often encountered that the solvent cannot be removed cleanly. Moreover, it is miscible with water and has a higher boiling point than water. It is difficult to dehydrate by simple solvent recovery methods. Just wash it off with water. In addition, DMF has certain toxicity. When the DMF storage tank is stored, a small amount of DMF will volatilize around the storage tank when the DMF finished product and waste liquid are out of the tank, in the tank or when the outside temperature rises, which will cause resource pollution. Waste also affects the environment, endangers the health of personnel, and has great potential safety hazards. the

Contents of the invention

The problem to be solved by the present invention is to provide a DMF gas recovery device with simple structure, convenient manufacture and low cost, which can fully absorb DMF gas for recycling by utilizing the characteristics of DMF being easily soluble in water, which not only solves environmental problems, but also reduces It reduces safety hazards and saves production materials. the

In order to solve the above technical problems, the present invention adopts the following technical solutions: a DMF gas recovery device, characterized in that: there is an exhaust pipe for collecting DMF gas, one end of the exhaust pipe is connected with the DMF storage tank, and the other end of the exhaust pipe Extending into the absorption liquid tank, there is a drier between the DMF storage tank and the exhaust pipe, a return pipe connected to the recovery rectification system on the absorption liquid tank, and a storage tank for the absorption liquid on the side of the absorption liquid tank The water storage tank, the drain pipe of the water storage tank extends into the absorption liquid tank, and a control system for controlling the discharge and replenishment of the absorption liquid is also arranged on the absorption liquid tank. the

Further, the control system includes detecting the concentration of DMF gas in the absorbing liquid and controlling the discharge of the absorbing liquid after the DMF gas in the absorbing liquid reaches the set concentration, and the detecting head of the detecting DMF gas concentration of the detecting and controlling discharge device extends into the absorption liquid, the inspection and discharge device also includes a solenoid valve I arranged between the return pipe and the absorption liquid tank, and the solenoid valve I is opened to discharge the absorption liquid after the DMF gas reaches the set concentration, and the absorption liquid water level is lower than the set value. When the low water level is set, the solenoid valve I is closed. the

Further, the control system also includes an automatic water supply device, which detects the water level of the absorption liquid through the water level detector on the side of the absorption liquid tank and controls the opening and closing of the solenoid valve II on the drain pipe of the water storage tank. Off, when the water level of the absorption liquid is lower than the set low water level, open the solenoid valve II to start replenishing the absorption liquid, and close the solenoid valve II to stop replenishing the absorption liquid when the water level of the absorption liquid reaches the set high water level. the

Further, the exhaust pipe extends into the absorption liquid tank by 10-20 mm. the

Further, the height of the set low water level is not lower than the height of the end surface of the exhaust pipe extending into the absorption liquid tank. Avoid the escape of DMF gas. the

Further, the absorption liquid is pure water or distilled water. for subsequent distillation. the

After adopting the above technical scheme, the present invention has the following advantages: simple structure, convenient manufacture, low cost, utilizing the characteristics of DMF being easily soluble in water, fully absorbing DMF gas for recycling, which not only solves environmental problems, but also reduces safety Hidden dangers, but also save the means of production. the

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is a schematic structural diagram of an embodiment of the present invention. the

Detailed ways

The structural representation of a kind of embodiment of the present invention as shown in Figure 1, a kind of DMF gas recovering device has the exhaust pipe 1 that collects DMF gas, one end of exhaust pipe 1 is connected with DMF storage tank 2, the end of exhaust pipe 1 The other end extends into the absorption liquid tank 3 by 10-20 mm, a drier 4 is provided between the DMF storage tank 2 and the exhaust pipe 1, and a return pipe 5 connected to the recovery rectification system is provided on the absorption liquid tank 3 , a water storage tank 7 for storing the absorption liquid 6 is arranged on the side of the absorption liquid tank, and the drain pipe 71 of the water storage tank 7 extends into the absorption liquid tank 3, and a control device for controlling the discharge and replenishment of the absorption liquid is also arranged on the absorption liquid tank 3 System 8; the control system 8 includes detecting the concentration of DMF gas in the absorption liquid 6 and controlling the discharge of the absorption liquid 6 after the DMF gas in the absorption liquid 6 reaches the set concentration, and the detection head 81 of the detection DMF gas concentration of the detection and control discharge device Extending into the absorption liquid 6, the inspection and discharge device also includes a solenoid valve I82 arranged between the return pipe 5 and the absorption liquid tank 3. After the DMF gas reaches the set concentration, the solenoid valve I82 is opened to discharge the absorption liquid 6. When it is lower than the set low water level 91, the electromagnetic valve I82 is closed; the control system 8 also includes an automatic water replenishment device, which detects the water level of the absorption liquid by the water level detector 83 arranged on the side of the absorption liquid tank 3 and controls the water level of the water storage tank 7. The solenoid valve II84 on the drain pipe 71 is turned on and off. When the water level of the absorption liquid is lower than the set low water level 91, the solenoid valve II84 is opened to start replenishing the absorption liquid 6. When the water level of the absorption liquid 6 reaches the set high water level 92, the solenoid valve is closed. II84 stops replenishing absorption solution 6. the

In the above embodiment, the height of the low water level 91 is set to be not lower than the height of the end face of the end of the exhaust pipe 1 extending into the absorption liquid tank 3, and the absorption liquid 6 is distilled water. The invention has the advantages of simple structure, convenient manufacture and low cost, utilizes the characteristic of DMF being extremely soluble in water, fully absorbs DMF gas for recycling, solves environmental problems, reduces potential safety hazards, and saves production materials. the

Except above-mentioned preferred embodiment, the present invention also has other embodiments, and those skilled in the art can make various changes and deformations according to the present invention, as long as they do not depart from the spirit of the present invention, all should belong to the scope defined in the appended claims of the present invention scope. the

Claims (6)

1. dimethyl formamide gas concentration unit, it is characterized in that: have the outlet pipe (1) of collecting dimethyl formamide gas, outlet pipe one end is connected with dimethyl formamide holding vessel (2), the other end of outlet pipe stretches into and absorbs in the liquid bath (3), between dimethyl formamide holding vessel and outlet pipe, be provided with exsiccator (4), be provided with on the liquid bath and reclaim the reflow pipe (5) that distillation system is connected absorbing, be provided with the water storage box (7) that stores absorption liquid (6) at the absorption liquid trough rim, the waste pipe of water storage box (71) extend into and absorbs in the liquid bath, is absorbing the control system (8) that also is provided with the discharging of control absorption liquid on the liquid bath and replenishes.

2. a kind of dimethyl formamide gas concentration unit according to claim 1, it is characterized in that: described control system comprise detect dimethyl formamide gas concentration in the absorption liquid and in absorption liquid dimethyl formamide gas reach the prosecution tapping equipment of setting control absorption liquid discharging after the concentration, the detecting head (81) of the detection dimethyl formamide gas concentration of described prosecution tapping equipment stretches in the absorption liquid, described prosecution tapping equipment also comprises the electromagnetic valve I (82) that is located between reflow pipe and the absorption liquid bath, after dimethyl formamide gas reaches setting concentration, open electromagnetic valve I discharging absorption liquid, when the absorption liquid water level is lower than setting low water level (91), close electromagnetic valve I.

3. a kind of dimethyl formamide gas concentration unit according to claim 1, it is characterized in that: described control system also comprises automatic water-replenishing device, described automatic water-replenishing device is by being located at the Push And Release of the electromagnetic valve II (84) on water level detection gauge (83) detection absorption liquid water level that absorbs on the liquid bath side and the waste pipe of the controlling water storage box, when the absorption liquid water level is lower than the setting low water level, open electromagnetic valve II and begin to replenish absorption liquid, when the absorption liquid water level reaches setting high water level (92), close electromagnetic valve II and stop to replenish absorption liquid.

4. a kind of dimethyl formamide gas concentration unit according to claim 1 is characterized in that: described outlet pipe stretches into and absorbs 10-20 millimeter in the liquid bath.

5. a kind of dimethyl formamide gas concentration unit according to claim 1 is characterized in that: the height of described setting low water level is not less than the height that outlet pipe stretches into the end face place of an end that absorbs liquid bath.

6. a kind of dimethyl formamide gas concentration unit according to claim 1 is characterized in that: described absorption liquid is a distilled water.

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