阅读说明：本技术 一种高效的三羟甲基丙烷合成溶剂精馏尾气回收装置 (Efficient trimethylolpropane synthetic solvent rectification tail gas recovery device ) 是由 郑铁江 蒋国强 马阳升 吴晓明 俞晔虎 赵跃 于 2019-09-25 设计创作，主要内容包括：本发明涉及精细化工技术领域中的再回收利用部分,具体公开了一种高效的三羟甲基丙烷合成溶剂精馏尾气回收装置,包括精馏塔、冷凝器装置和冷凝片装置,精馏塔上部和冷凝器装置连接,冷凝器装置和冷凝片装置连接,曲面冷凝片装置包括罐体、曲面冷凝片和集液槽,曲面冷凝片和集液槽均在罐体内部,集液槽在曲面冷凝片下方,冷凝器装置中第一冷凝器、第二冷凝器和第三冷凝器依次相接,第一冷凝器和精馏塔上部连接,第三冷凝器和罐体连接。气相经过三级冷凝器,后经过曲面冷凝片组的冷凝后,尾气中的VOC含量可以由原来的20％降低到5％左右,并且曲面冷凝片组充分保证了冷凝接触面,而且使用操作简单,后期清理维护都很方便。(the invention relates to a recycling part in the technical field of fine chemical engineering, and particularly discloses an efficient trimethylolpropane synthetic solvent rectification tail gas recovery device which comprises a rectification tower, a condenser device and a condensing sheet device, wherein the upper part of the rectification tower is connected with the condenser device, the condenser device is connected with the condensing sheet device, the curved-surface condensing sheet device comprises a tank body, a curved-surface condensing sheet and a liquid collecting tank, the curved-surface condensing sheet and the liquid collecting tank are arranged in the tank body, the liquid collecting tank is arranged below the curved-surface condensing sheet, a first condenser, a second condenser and a third condenser in the condenser device are sequentially connected, the first condenser is connected with the upper part of the rectification tower, and the third condenser is connected with the tank body. The gas phase passes through the three-stage condenser, and then passes through the condensation of the curved surface condensing sheet group, the VOC content in the tail gas can be reduced to about 5% from original 20%, and the curved surface condensing sheet group fully ensures the condensation contact surface, and the device is simple to use and operate, and is very convenient to clean and maintain in the later period.)

1. An efficient recovery device for rectification tail gas of trimethylolpropane synthetic solvent comprises a rectification tower (1), a condenser device (2) and a condensing sheet device, wherein the upper part of the rectification tower (1) is connected with the condenser device (2), the condenser device (2) is connected with the condensing sheet device, and the recovery device is characterized in that,

The condensing sheet device is a curved condensing sheet device, the curved condensing sheet device comprises a tank body (3), curved condensing sheets (4) and a liquid collecting tank (5), the curved condensing sheets (4) and the liquid collecting tank (5) are arranged in the tank body (3), and the liquid collecting tank (5) is arranged below the curved condensing sheets (4);

Condenser device (2) include first condenser (21), second condenser (22), third condenser (23), first condenser (21), second condenser (22) and third condenser (23) connect gradually, first condenser (21) with rectifying column (1) upper portion is connected, third condenser (23) with jar body (3) are connected.

2. the efficient recovery device for the rectification tail gas of the trimethylolpropane synthesis solvent as claimed in claim 1, wherein the condenser device further comprises a reflux tank (24) and a layering tank (25), the lower parts of the first condenser (21) and the second condenser (22) are connected with the reflux tank (24), the lower part of the third condenser (23) is connected with the layering tank (25), the reflux tank (24) is connected with the layering tank (25), and the lower part of the reflux tank (24) is connected with the rectification tower (1).

3. The efficient recovery device for rectification tail gas of trimethylolpropane synthesis solvent according to claim 1, characterized in that a water circulation vacuum pump (6) is arranged between the third condenser (23) and the tank (3).

4. The efficient recovery device for the rectification tail gas of the trimethylolpropane synthesis solvent as claimed in claim 1, wherein a liquid collecting pore plate (7) is arranged between the liquid collecting tank (5) and the curved surface condensing sheet (4), and a concave hole (10) is arranged on the liquid collecting pore plate (7).

5. The efficient recovery device for rectification tail gas of trimethylolpropane synthesis solvent according to claim 1, wherein the curved condensing sheet (4) comprises an upper curved condensing sheet group and a lower curved condensing sheet group, and each curved condensing sheet group comprises a plurality of curved condensing sheets arranged in sequence.

6. the device for efficiently recovering the rectification tail gas of the trimethylolpropane synthesis solvent according to claim 5, wherein a condensed water outlet (42) is arranged above each layer of curved surface condenser sheets, and a condensed water inlet (41) is arranged below each layer of curved surface condenser sheets.

7. The efficient recovery device for the rectification tail gas of the trimethylolpropane synthesis solvent as claimed in claim 1, wherein a tail gas outlet (8) is arranged at the top of the tank body (3), and a tail gas detection device (9) is connected to the outside of the tail gas outlet (8).

Technical Field

the invention belongs to a recycling part in the technical field of fine chemical engineering, and particularly relates to a high-efficiency recovery device for rectification tail gas of a trimethylolpropane synthetic solvent.

Background

The trimethylolpropane takes formaldehyde and n-butyl aldehyde as raw materials, and is condensed under the action of a catalyst to prepare the trimethylolpropane, and the formaldehyde used in the raw materials is oxidized by methanol and is self-prepared.

methanol is prepared into formaldehyde solution by oxygen under the catalysis of catalyst silver, and the reaction equation is as follows:

2CH₃OH+O₂→2HCHO+2H₂O

CH₃OH→HCHO+H₂

Formaldehyde and n-butyraldehyde are condensed in an alkaline sodium hydroxide solution to form trimethylolpropane, and the reaction equation is as follows:

the trimethylolpropane generated by condensation is partially etherified and converted into ditrimethylol as a byproduct, and the reaction equation is as follows:

At present, the trihydroxy synthesis reaction is relatively stable and mature, and residual methanol and formaldehyde in the reaction can be stably removed through a dealcoholization tower and a dealdehyding tower. In the solvent recovery stage, in the rectification cooling process, after the solvent is rectified at negative pressure, condensed and refluxed by a three-stage tube nest condenser, the VOC content (VOC is mainly octanol) can be controlled to be about 15-20 percent, and the requirement of environmental protection cannot be met.

Therefore, there is a need for a method or apparatus that can control VOCs within acceptable standards.

Disclosure of Invention

the invention provides a high-efficiency recovery device for trimethylolpropane synthesis solvent rectification tail gas, which realizes the treatment and recovery of the tail gas of a solvent rectification tower, reduces the VOC content in the tail gas by treating the tail gas,

In order to solve the problems mentioned in the background art, the invention provides a high-efficiency recovery device for rectification tail gas of a trimethylolpropane synthesis solvent, which comprises a rectification tower, a condenser device and a condensing sheet device, wherein the upper part of the rectification tower is connected with the condenser device, the condenser device is connected with the condensing sheet device,

The device comprises a tank body, a curved surface condensing sheet and a liquid collecting tank, wherein the curved surface condensing sheet and the liquid collecting tank are arranged in the tank body;

further, the condenser device comprises a first condenser, a second condenser and a third condenser, wherein the first condenser, the second condenser and the third condenser are sequentially connected, the first condenser is connected with the upper part of the rectifying tower, and the third condenser is connected with the tank body.

Further, the condenser device further comprises a reflux tank and a layering tank, the lower parts of the first condenser and the second condenser are connected with the reflux tank, the lower part of the third condenser is connected with the layering tank, the reflux tank is connected with the layering tank, and the lower part of the reflux tank is connected with the rectifying tower.

Further, a water circulation vacuum pump is arranged between the third condenser and the tank body.

Furthermore, a liquid collecting pore plate is arranged between the liquid collecting tank and the curved surface condensing sheet, and a concave hole is formed in the liquid collecting pore plate.

furthermore, the curved surface condensing sheet comprises an upper curved surface condensing sheet group and a lower curved surface condensing sheet group, and each curved surface condensing sheet group comprises a plurality of curved surface condensing sheets which are arranged in sequence.

Furthermore, a condensed water outlet is arranged above each layer of curved surface condenser sheet, and a condensed water inlet is arranged below each layer of curved surface condenser sheet.

Further, the top of the tank body is provided with a tail gas outlet, and the outside of the tail gas outlet is connected with a tail gas detection device.

The invention has the beneficial effects that: the solvent passes through the rectifying column negative pressure rectification back under the effect of hydrologic cycle vacuum pump, through tertiary condenser, and a small amount of steam is after the condensation of self-control wave curved surface condensing sheet group again at last, and VOC content in the tail gas can be reduced to about 5% by original 20%, has reached green's theory to this wave curved surface condensing sheet group has fully guaranteed the condensation contact surface, uses easy operation moreover, and later stage clearance is maintained all very conveniently.

drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a general schematic of the present invention;

FIG. 2 is a top view of a collector orifice plate in the present invention;

FIG. 3 is a schematic view of a condensate inlet and a condensate outlet in the present invention;

FIG. 4 is a schematic view of the recessed holes in the trap plate of the present invention.

In the figure: the method comprises the following steps of 1-a rectifying tower, 2-a condenser device, 21-a first condenser, 22-a second condenser, 23-a third condenser, 24-a reflux tank, 25-a layering tank, 3-a tank body, 4-a curved surface condensing sheet, 41-a condensed water inlet, 42-a condensed water outlet, 5-a liquid collecting tank, 6-a water circulation vacuum pump, 7-a liquid collecting pore plate, 8-a tail gas outlet, 9-a tail gas detection device and 10-pores.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the specification of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In a specific embodiment of the present invention, as shown in fig. 1 to 4, a high-efficiency recovery device for rectification tail gas of trimethylolpropane synthesis solvent is specifically disclosed, which comprises a rectification column 1, a condenser device 2 and a condensing sheet device, wherein the upper part of the rectification column 1 is connected with the condenser device 2, the condenser device 2 is connected with the condensing sheet device,

The condensing sheet device is a curved condensing sheet device, the curved condensing sheet device comprises a tank body 3, curved condensing sheets 4 and a liquid collecting tank 5, a tail gas outlet 8 is arranged at the top of the tank body 3, a tail gas detection device 9 is connected to the outside of the tail gas outlet 8, the curved condensing sheets 4 comprise an upper curved condensing sheet layer and a lower curved condensing sheet layer, each curved condensing sheet layer comprises a plurality of curved condensing sheets which are sequentially arranged, a condensed water outlet 42 is arranged above each curved condensing sheet layer, a condensed water inlet 41 is arranged below each curved condensing sheet layer, the curved condensing sheets 4 and the liquid collecting tank 5 are both arranged inside the tank body 3, the liquid collecting tank 5 is arranged below the curved condensing sheets 4, a liquid collecting hole plate 7 is arranged between the liquid collecting tank 5 and the curved condensing sheets 4, and a concave hole 10 is arranged on the liquid collecting hole plate 7;

The condenser device 2 comprises a first condenser 21, a second condenser 22 and a third condenser 23, the first condenser 21, the second condenser 22 and the third condenser 23 are sequentially connected, the first condenser 21 is connected with the upper part of the rectifying tower 1, the third condenser 23 is connected with the tank body 3, and a water circulation vacuum pump 6 is arranged between the tank body 3 and the third condenser 23.

the condenser device further comprises a reflux tank 24 and a layering tank 25, the lower parts of the first condenser 21 and the second condenser 22 are connected with the reflux tank 24, the lower part of the third condenser 23 is connected with the layering tank 25, the reflux tank 24 is connected with the layering tank 25, and the lower part of the reflux tank 24 is connected with the rectifying tower 1.

The action process of the invention is as follows: opening a feeding pump of a rectifying tower 1 of a solvent (wherein VOC is octanol and has the main content of 76350ppm), controlling the temperature of the tower at 165 ℃, controlling the temperature of the top of the tower at 100 ℃, rectifying the VOC in the rectifying tower 1, then introducing a gas phase into a condenser device 2, condensing the gas phase through a first condenser 21 and a second condenser 22, introducing part of condensate into a reflux tank 24, continuously introducing the condensate into the rectifying tower 1 for rectification and purification, separating light and heavy components of the collected condensate through a layering tank 25 connected with the lower part 23 of a third condenser, facilitating recovery and post-treatment, introducing residual part of tail gas into a curved surface condensing sheet device in a tank body 3 behind a water circulation vacuum pump 6, finally introducing a small amount of tail gas in the water circulation vacuum pump 6 from the middle of two layers of wave curved surface condensing sheet sets, condensing the condensate on a lower liquid collecting pore plate 7 after fully contacting and condensing with the wave curved surface condensing sheet in the condensing sheet device, and then introducing the condensate into a lower liquid collecting tank 5 from a 15-degree, the condensed tail gas is discharged from a tail gas outlet 8 and enters a tail gas detection device 9.

And finally, tail gas is collected at the upper part of the curved surface condensing sheet set device at three time points and VOC detection is carried out, the three detection results are 3600ppm, 3522ppm and 3478ppm respectively, the VOC condensation efficiency can be calculated to be about 95%, and the environment-friendly concept of green and environment protection is achieved.

the above disclosure is only one preferred embodiment of the present invention, and certainly should not be construed as limiting the scope of the invention, which is defined by the claims and their equivalents.