A device for recovering toluene from aldehyde oxime production exhaust gas

Abstract

The utility model relates to chemical production waste gas treatment technical field especially, relates to a kind of aldehyde oxime production waste gas toluene recovery device.Its technical scheme includes: condenser, the air outlet end of the condenser is provided with ice machine set, the air outlet end of the ice machine set is provided with adsorption tower, the air outlet end of the adsorption tower is provided with toluene analyzer, the air outlet end of the toluene analyzer is provided with spray tower, the adsorption tower side is provided with backflush system, and the backflush system includes the production water tank and methanol storage tank of backflush inlet setting on adsorption tower.The utility model can strengthen condensation effect by the setting of ice machine set, reduce adsorption tower load, improve toluene recovery rate, by the setting of toluene analyzer and backflush system mutual cooperation can be adjusted backflush frequency according to concentration, subsection backflush, guarantee toluene purity, reduce methanol residue, backflush liquid distillation separation, toluene is recycled for production, water phase standard treatment, reduce pollution, to realize waste gas purification and resource recovery integration.

Description

Technical Field

[0001] This utility model relates to the field of chemical production waste gas treatment technology, and in particular to a toluene recovery device for aldehyde oxime production waste gas. Background Technology

[0002] In the production of copper extractant 2-hydroxy-5-nonylbenzaldehyde oxime, industrial toluene is used as the reaction solvent. The main function of toluene is to reduce the viscosity of the reaction substrate and improve the mass transfer efficiency. During the synthesis reaction of magnesium methoxide, the generated hydrogen gas will carry the toluene solvent to volatilize. Hydrogen gas is a clean gas with low density, but it has the risk of being ignited and exploded after accumulation. It needs to be purified before being discharged. The toluene it carries is a volatile and toxic compound that needs to be treated and recovered. In existing technologies for toluene waste gas recovery, the waste gas is first passed through a condenser to form a toluene mixture, which is then washed with water. The methanol is then transferred to the aqueous phase and separated from the toluene layer. The separated aqueous toluene-containing solution is reused through a toluene distillation and dehydration unit. The light components of the waste gas passing through the condenser enter a U-tube and receiving tank, and the purified hydrogen is discharged. However, this method does not completely purify toluene. When the methanol-magnesium reaction proceeds rapidly, the amount of waste gas generated is large, and the short time the waste gas passes through the condenser makes it easy for the discharged gas to contain small amounts of toluene, potentially causing environmental pollution. This also reduces the toluene recovery rate and increases production costs. Therefore, we propose a toluene recovery device for aldehyde oxime production waste gas. Utility Model Content

[0003] The purpose of this invention is to address the problems existing in the background technology by proposing a toluene recovery device for aldehyde oxime production waste gas.

[0004] The technical solution of this utility model is as follows: A toluene recovery device for aldehyde oxime production waste gas includes a condenser, an ice unit is installed at the outlet of the condenser, an adsorption tower is installed at the outlet of the ice unit, a toluene analyzer is installed at the outlet of the adsorption tower, a spray tower is installed at the outlet of the toluene analyzer, a backflushing system is installed on one side of the adsorption tower, the backflushing system includes a production water tank and a methanol storage tank installed at the backflushing inlet of the adsorption tower, a backflushing liquid collection tank is installed at the backflushing outlet of the adsorption tower, a distillation reactor is installed on one side of the backflushing liquid collection tank, and a toluene recovery tank is installed on the side of the distillation reactor away from the backflushing liquid collection tank.

[0005] Preferably, the air inlet end of the condenser is installed correspondingly to the exhaust end, and the air inlet end of the ice machine is installed correspondingly to the air outlet end of the condenser.

[0006] Preferably, the air inlet of the adsorption tower is installed corresponding to the air outlet of the ice machine unit, and the packing material inside the adsorption tower is a non-polar resin material.

[0007] Preferably, the inlet of the toluene analyzer is installed corresponding to the outlet of the adsorption tower, and the toluene analyzer can monitor the toluene concentration in the adsorption tower. The inlet of the spray tower is installed corresponding to the outlet of the toluene analyzer, and the outlet of the spray tower is installed corresponding to the external purified gas discharge port.

[0008] Preferably, each of the production water tank and methanol storage tank is connected to the adsorption tower by a connecting pipe, and each connecting end is equipped with an electromagnetic control valve, which is electrically connected to an external control system.

[0009] Preferably, a connecting pipe is provided between the air outlet of the adsorption tower and the air inlet of the backflushing liquid collection tank.

[0010] Preferably, a serpentine condenser is provided between the distillation reactor and the toluene recovery tank, and a circulating water pipe is provided between the serpentine condenser and the ice unit.

[0011] Compared with the prior art, the present invention has the following beneficial technical effects:

[0012] This utility model has a reliable overall structure. The condensation effect can be enhanced by the setting of the ice unit, the load on the adsorption tower can be reduced, and the toluene recovery rate can be improved. The backflushing frequency can be automatically adjusted according to the concentration by the coordinated setting of the toluene analyzer and the backflushing system, and the backflushing can be carried out in stages to ensure the purity of toluene, reduce methanol residue, and separate the backflushing liquid by distillation. The toluene can be recycled for production, and the aqueous phase can be treated in a standardized manner to reduce pollution, thereby realizing the integration of waste gas purification and resource recovery. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the modules of this utility model.

[0015] Attached reference numerals: 1. Condenser; 2. Ice unit; 3. Adsorption tower; 4. Toluene analyzer; 5. Spray tower; 6. Backflushing system; 7. Serpentine condenser tube. Detailed Implementation

[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] Example

[0018] like Figure 1-2As shown, this utility model proposes a toluene recovery device for aldehyde oxime production waste gas, including a condenser 1. The inlet end of the condenser 1 is installed correspondingly to the waste gas end, allowing for primary condensation of the waste gas. An ice machine unit 2 is installed at the outlet end of the condenser 1, with its inlet end corresponding to the outlet end of the condenser 1. The inlet end of the ice machine unit 2 is fixedly connected to the outlet end of the condenser 1, allowing for secondary condensation of the waste gas after primary condensation, thereby further improving the condensation effect. An adsorption tower 3 is installed at the outlet end of the ice machine unit 2, with its inlet end corresponding to the outlet end of the ice machine unit 2. The waste gas after two condensations is transported into the adsorption tower 3, which uses Q34 stainless steel. The adsorption tower 3 is lined with 5R+PTFE material, and the packing material inside the adsorption tower 3 is a non-polar resin material. A toluene analyzer 4 is installed at the outlet end of the adsorption tower 3. The inlet end of the toluene analyzer 4 is installed corresponding to the outlet end of the adsorption tower 3, and the inlet end of the toluene analyzer 4 is fixedly connected to the outlet end of the adsorption tower 3. The toluene analyzer 4 can monitor the toluene concentration in the adsorption tower 3. After detecting the toluene concentration in the adsorption tower 3, the toluene analyzer 4 performs diversion treatment. A spray tower 5 is installed at the outlet end of the toluene analyzer 4. The inlet end of the spray tower 5 is installed corresponding to the outlet end of the toluene analyzer 4, and the inlet end of the spray tower 5 is fixedly connected to the outlet end of the toluene analyzer 4. The outlet end of the spray tower 5 is installed corresponding to the external purified gas discharge port. The spray tower 5 can be set up to spray and purify the waste gas with the concentration meeting the standard.

[0019] A backflushing system 6 is installed on one side of the adsorption tower 3. The backflushing system 6 is electrically connected to the toluene analyzer 4 and the external control system. The backflushing system 6 includes a production water tank 61 and a methanol storage tank 62 located at the backflushing inlet of the adsorption tower 3. Each of the production water tank 61 and the methanol storage tank 62 is connected to the adsorption tower 3 by a connecting pipe. Multiple sets of connecting pipes fix the production water tank 61 and the methanol storage tank 62 to the backflushing inlet of the adsorption tower 3, respectively. Each connecting end is equipped with an electromagnetic control valve, which is electrically connected to the external control system. The electromagnetic control valve can control the opening and closing of the connecting pipe. A backflushing liquid collection tank 63 is installed at the backflushing outlet of the adsorption tower 3. A connection is made between the gas outlet of the adsorption tower 3 and the gas inlet of the backflushing liquid collection tank 63. A connecting pipe is provided, with its two ends fixedly connected to the outlet of the adsorption tower 3 and the inlet of the backflushing liquid collection tank 63, respectively. The backflushing liquid collection tank 63 is designed to collect backflushing waste liquid in a centralized manner. A distillation reactor 64 is provided on one side of the backflushing liquid collection tank 63. A toluene recovery tank 65 is provided on the side of the distillation reactor 64 away from the backflushing liquid collection tank 63. A serpentine condenser 7 is provided between the distillation reactor 64 and the toluene recovery tank 65, with its two ends fixedly connected to the distillation reactor 64 and the toluene recovery tank 65, respectively. A circulating water pipe is provided between the serpentine condenser 7 and the ice unit 2. The serpentine condenser 7 is designed to cool and condense the waste gas after distillation, and the toluene recovery tank 65 is designed to collect toluene.

[0020] In this embodiment, the operator allows the exhaust gas to flow into the condenser 1, and then after being condensed by the condenser 1, it is fed into the ice unit 2. After being condensed again by the ice unit 2, the exhaust gas is sent to the adsorption tower 3, where toluene is adsorbed. At this time, the toluene analyzer 4 detects the toluene concentration in the adsorption tower 3. When the concentration reaches the standard, the exhaust gas enters the spray tower 5 for purification and is finally discharged from the outlet.

[0021] When the concentration exceeds the standard, the waste gas is diverted by the toluene analyzer 4. At this time, the backflushing system 6 is in operation, the valve on the methanol storage tank 62 is opened, and methanol flows into the adsorption tower to wash off the adsorbed toluene. The backflushing liquid flows into the backflushing liquid collection tank 63. Then, the valve of the production water tank 61 is opened, and the production water washes the residual methanol in the adsorption tower 3. Then, the backflushing liquid flows into the backflushing liquid collection tank 63. Then, the mixture in the backflushing liquid collection tank 63 is transported to the distillation reactor 64 for steam heating and distillation. The phase separation is carried out by the difference in boiling point and density, so that the toluene phase is circulated and distilled in the distillation reactor 64. After continuous distillation and dehydration to reach the set threshold, it is cooled by the serpentine condenser 7 and then transported to the toluene recovery tank 65.

[0022] The above-described specific embodiments are merely preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above-described specific embodiments.

Claims

1. A toluene recovery device for aldehyde oxime production waste gas, comprising a condenser (1), characterized in that: An ice machine unit (2) is provided at the outlet of the condenser (1), an adsorption tower (3) is provided at the outlet of the ice machine unit (2), a toluene analyzer (4) is provided at the outlet of the adsorption tower (3), a spray tower (5) is provided at the outlet of the toluene analyzer (4), a backflushing system (6) is provided on one side of the adsorption tower (3), the backflushing system (6) includes a production water tank (61) and a methanol storage tank (62) provided at the backflushing inlet of the adsorption tower (3), a backflushing liquid collection tank (63) is provided at the backflushing outlet of the adsorption tower (3), a distillation reactor (64) is provided on one side of the backflushing liquid collection tank (63), and a toluene recovery tank (65) is provided on the side of the distillation reactor (64) away from the backflushing liquid collection tank (63).

2. The toluene recovery device for aldehyde oxime production waste gas according to claim 1, characterized in that, The air inlet end of the condenser (1) is installed corresponding to the exhaust end, and the air inlet end of the ice machine (2) is installed corresponding to the air outlet end of the condenser (1).

3. The toluene recovery device for aldehyde oxime production waste gas according to claim 1, characterized in that, The air inlet of the adsorption tower (3) is installed corresponding to the air outlet of the ice machine unit (2), and the packing material inside the adsorption tower (3) is a non-polar resin material.

4. The toluene recovery device for aldehyde oxime production waste gas according to claim 1, characterized in that, The inlet of the toluene analyzer (4) is installed corresponding to the outlet of the adsorption tower (3). The toluene analyzer (4) can monitor the toluene concentration in the adsorption tower (3). The inlet of the spray tower (5) is installed corresponding to the outlet of the toluene analyzer (4). The outlet of the spray tower (5) is installed corresponding to the external purified gas discharge port.

5. A toluene recovery device for aldehyde oxime production waste gas according to claim 1, characterized in that, Each of the production water tank (61) and methanol storage tank (62) is connected to the adsorption tower (3) by a connecting pipe, and each of the connecting pipes is equipped with an electromagnetic control valve, which is electrically connected to an external control system.

6. The toluene recovery device for aldehyde oxime production waste gas according to claim 1, characterized in that, A connecting pipe is provided between the outlet end of the adsorption tower (3) and the inlet end of the backflushing liquid collection tank (63).

7. A toluene recovery device for aldehyde oxime production waste gas according to claim 1, characterized in that, A serpentine condenser (7) is provided between the distillation reactor (64) and the toluene recovery tank (65), and a circulating water pipe is provided between the serpentine condenser (7) and the ice unit (2).

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