CN218609333U

CN218609333U - Nitration device for preparing nitrobenzene by utilizing RTB reactor

Info

Publication number: CN218609333U
Application number: CN202223273730.8U
Authority: CN
Inventors: 丁全有; 陈霄; 蔡盛; 宁加彬; 赵银磊; 逄恩旋
Original assignee: Shandong Weijing Chemical Technology Co ltd
Current assignee: Shandong Weijing Chemical Technology Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-03-14
Anticipated expiration: 2032-12-07

Abstract

The utility model relates to the field of nitration reaction devices, and discloses a nitration device for preparing nitrobenzene by using an RTB reactor, which comprises a microchannel reactor and an RTB reactor, wherein a first inlet of the microchannel reactor is connected with a mixed acid feed inlet through a first pipeline, a second inlet of the microchannel reactor is connected with an m-dichlorobenzene feed inlet through a second pipeline, and the microchannel reactor is communicated with the RTB reactor through the first pipeline; the first pipeline is provided with a first metering pump, the first metering pump is taken as a node, the second pipeline is provided with a second metering pump, and the second metering pump is taken as a node; a branch pipe is arranged on the first pipeline and communicated with the mixed acid diffusing pipeline; the second pipeline is provided with a branch pipe communicated with the m-dichlorobenzene diffusing pipeline. Realizes continuous and automatic production operation from the original raw materials to the final product.

Description

Nitration device for preparing nitrobenzene by utilizing RTB reactor

Technical Field

The utility model relates to a nitration reaction device field, in particular to utilize nitration device of RTB reactor preparation nitrobenzene.

Background

The nitration reaction is one of the more common reactions in industrial production, the nitration product of the reaction occupies an important position in the aspects of medicines, pesticides, dyes and the like, and the nitration reaction is to introduce a nitro group (-NO) into organic molecules ₂ ) The reaction process of (1). The nitration process is carried out in the liquid phase, typically using a tank reactor. Firstly, excessive nitric acid and concentrated sulfuric acid are needed to be added in the reaction process, and the problem of waste liquid generation is serious. Secondly, the nitrating agent has strong corrosivity and strong oxidizing property, and materials involved in the nitration reaction, such as nitration products, byproducts and the like, have explosion danger. Thirdly, the nitration is a strong exothermic reaction, the reaction rate is high, the exothermic quantity is large, most nitration reaction systems belong to heterogeneous phase, the uneven distribution of reaction components easily causes local overheating to cause danger, the poor control can cause explosion, and therefore the removal of heat is also a prominent problem for controlling the nitration reaction.

SUMMERY OF THE UTILITY MODEL

The utility model provides an utilize RTB reactor preparation nitrobenzene nitrify device has solved the exothermic concentration in the production process, and the waste liquid remains many problems, has effectually carried out thermal removal, realizes from raw materials to the serialization of final product, automated production operation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a nitration device for preparing nitrobenzene by utilizing an RTB reactor comprises a microchannel reactor and the RTB reactor, wherein a first liquid inlet of the microchannel reactor is connected with an acid mixing feed inlet through a first pipeline, a second liquid inlet of the microchannel reactor is connected with an m-dichlorobenzene feed inlet through a second pipeline, and a liquid outlet of the microchannel reactor is communicated with a liquid inlet of the RTB reactor through a pipeline; the first pipeline is provided with a first metering pump, the first metering pump is taken as a node, the upper section pipeline of the first pipeline is provided with an overpressure relief device, a first flowmeter, a safety valve, a first one-way valve and a first pressure sensor, and the lower section pipeline of the first pipeline is provided with a mixing tank and a three-way ball valve; a second metering pump is arranged on the second pipeline, the second metering pump is taken as a node, an overpressure relief device, a second flowmeter, a safety valve, a second one-way valve and a second pressure sensor are arranged on the upper section of the second pipeline, and a three-way ball valve is arranged on the lower section of the second pipeline; a branch pipe is arranged on the first pipeline and communicated with the mixed acid diffusing pipeline; the second pipeline is provided with a branch pipe communicated with the m-dichlorobenzene diffusing pipeline.

Preferably, a first mixed acid diffusing branch pipe is arranged on the lower section pipeline on the left side of the first metering pump, a second mixed acid diffusing branch pipe and a third mixed acid diffusing branch pipe are arranged on the upper section pipeline on the right side of the first pressure sensor, and a fourth mixed acid diffusing branch pipe and a fifth mixed acid diffusing branch pipe are arranged on the upper section pipeline on the right side of the first check valve.

Preferably, a first m-dichlorobenzene diffusing branch pipe is arranged on a lower section pipeline on the left side of the second metering pump, a second m-dichlorobenzene diffusing branch pipe and a third m-dichlorobenzene diffusing branch pipe are arranged on an upper section pipeline on the right side of the second pressure sensor, and a fourth m-dichlorobenzene diffusing branch pipe and a fifth m-dichlorobenzene diffusing branch pipe are arranged on an upper section pipeline on the right side of the second one-way valve.

Preferably, the first pipeline and the second pipeline are both provided with two three-way ball valves, and two sections of branch pipelines connected with the two three-way ball valves are both provided with Y-shaped filters.

Preferably, the first pipeline and the second pipeline are communicated with the nitrogen pipeline through a nitrogen branch pipeline and are communicated with the flushing pipeline through a flushing branch pipeline.

Preferably, the first metering pump and the second metering pump are both pulse-free three-pump-head diaphragm metering pumps.

Preferably, the upper end of the microchannel reactor is communicated with the first heat exchange medium inlet, and the lower end of the microchannel reactor is communicated with the first heat exchange medium outlet; one side of the upper wall of the RTB reactor is communicated with the second heat exchange medium inlet, and the other side of the upper wall of the RTB reactor is communicated with the second heat exchange medium inlet.

Preferably, the upper end and the lower end of the microchannel reactor are provided with a first temperature sensor and a second temperature sensor, the left end and the right end of the RTB reactor are provided with a third temperature sensor and a fourth temperature sensor, and temperature signals, a heat exchange medium pump and a valve are subjected to linkage control.

Preferably, the left side of the RTB reactor is connected with a discharge port through a discharge pipeline.

Compared with the prior art, the utility model has the advantages of:

the utility model relates to an utilize RTB reactor preparation nitrobenzene's nitration device, the device divide part technical design through feeding unit, reaction unit, heat transfer unit and control system four, have accomplished the overall process serialization production, realize from raw materials to the serialization of final product, automated production operation.

Drawings

FIG. 1 is a schematic diagram of a nitration plant for producing nitrobenzene using an RTB reactor of the present invention;

in the figure, 1-first line; 2-mixed acid feed inlet; 3-mixing tank; 4-a first metering pump; 5-a second pipeline; a 6-m-dichlorobenzene feed port; 7-a second metering pump; 8-microchannel reactor; 9-RTB reactor; 10-three-way ball valve; an 11-Y filter; 12-nitrogen line; 13-flushing the line; 14-a second pressure sensor; 15-a second flow meter; 16-a second one-way valve; 17-mixed acid diffusing pipeline; an 18-m-dichlorobenzene discharge line; 19-a first temperature sensor; 20-a second temperature sensor; 21-a third temperature sensor; 22-a fourth temperature sensor; 23-a first heat exchange medium outlet; 24-a first heat exchange medium inlet; 25-a second heat exchange medium outlet; 26-a second heat exchange medium inlet; 27-a first mixed acid diffusing branch pipe; 28-a second mixed acid diffusing branch pipe; 29-a third mixed acid diffusing branch pipe; 30-a fourth mixed acid diffusing branch pipe; 31-a fifth mixed acid diffusing branch pipe; 32-a first m-dichlorobenzene dispensing branch pipe; 33-second m-dichlorobenzene diffusing branch pipe; 34-a third m-dichlorobenzene dispensing branch pipe; 35-a fourth m-dichlorobenzene dispensing branch pipe; 36-fifth m-dichlorobenzene dispensing branch pipe; 37-a discharge hole; 38-a second pressure sensor; 39-second one-way valve.

Detailed Description

The following is further described with reference to the accompanying drawings. As shown in fig. 1, a nitration apparatus for preparing nitrobenzene by using an RTB reactor comprises a microchannel reactor 8 and an RTB reactor 9, wherein a first liquid inlet of the RTB reactor 9 is connected with a mixed acid feed port 2 through a first pipeline 1, a second liquid inlet of the microchannel reactor 8 is connected with an m-dichlorobenzene feed port 6 through a second pipeline 5, and a liquid outlet of the microchannel reactor 8 is communicated with a liquid inlet of the RTB reactor 9 through the first pipeline 1; a first metering pump 4 is arranged on the first pipeline 1, an overpressure relief device, a flowmeter, a safety valve and a one-way valve are arranged on an upper section pipeline of the first pipeline 1 at the node of the first metering pump 4, and a mixing tank 3 and a three-way ball valve 10 are arranged on a lower section pipeline of the first pipeline 1; a second metering pump 7 is arranged on the second pipeline 5, a second metering pump 7 node is arranged, an overpressure release device, a flowmeter, a safety valve and a one-way valve are arranged on the upper section pipeline of the second pipeline 5, and a three-way ball valve 10 is arranged on the lower section pipeline of the second pipeline 5; a branch pipe is arranged on the first pipeline 1 and is communicated with a mixed acid diffusing pipeline 17, wherein a first mixed acid diffusing branch pipe 27 is arranged on a lower section pipeline on the left side of the first metering pump 4, a second mixed acid diffusing branch pipe 28 and a third mixed acid diffusing branch pipe 29 are arranged on an upper section pipeline on the right side of the pressure sensor, and a fourth mixed acid diffusing branch pipe 30 and a fifth mixed acid diffusing branch pipe 31 are arranged on an upper section pipeline on the right side of the one-way valve; be provided with the bleeder pipe on the second pipeline 5 and diffuse pipeline 18 with m-dichlorobenzene and be linked together, wherein set up first m-dichlorobenzene on the left lower section pipeline of second measuring pump 7 and diffuse bleeder pipe 32, set up second m-dichlorobenzene on pressure sensor's the right side on the section pipeline and diffuse bleeder pipe 33, third m-dichlorobenzene and diffuse bleeder pipe 34, set up fourth m-dichlorobenzene on the upper section pipeline on check valve right side and diffuse bleeder pipe 35, fifth m-dichlorobenzene and diffuse bleeder pipe 36. The reaction system is designed by adopting the combination of the micro-channel reactor 8 and the RTB reactor 9, and can carry out reactions at different temperatures in different regions; the mixed materials in the microchannel reactor 8 continuously enter the RTB reactor 9 in proportion. The first pipeline 1 and the second pipeline 5 are both provided with two three-way ball valves 10, and two sections of branch pipelines connected with the two three-way ball valves are both provided with Y-shaped filters 11. The first pipeline 1 and the second pipeline 5 are communicated with a nitrogen pipeline 12 through a nitrogen branch pipeline and communicated with a flushing pipeline 13 through a flushing branch pipeline. The first metering pump 4 and the second metering pump 7 both adopt pulse-free three-pump-head diaphragm metering pumps, and the whole set of feeding system can realize accurate metering of raw material flow while ensuring operation safety. The upper end of the microchannel reactor 8 is communicated with a first heat exchange medium inlet 24, and the lower end of the microchannel reactor 8 is communicated with a first heat exchange medium outlet 23; one side of the upper wall of the RTB reactor 9 is communicated with a second heat exchange medium inlet 26, and the other side of the upper wall of the RTB reactor 9 is communicated with a second heat exchange medium outlet 25. The upper end and the lower end of the microchannel reactor 8 are provided with a first temperature sensor 19 and a second temperature sensor 20, the left end and the right end of the RTB reactor are provided with a third temperature sensor 21 and a fourth temperature sensor 22, temperature signals and a heat exchange medium pump and a valve are in linkage control, when the temperature rises, the system can automatically improve the flow of the heat exchange medium, the heat exchange amount is increased to ensure accurate temperature control, and the optimal condition of reaction is realized. The left side of the RTB reactor 9 is connected to a discharge opening 37 via a discharge line. The whole device is internally provided with a PLC control system, and equipment or a production process in the control system is output in a digital or analog mode.

Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.

Claims

1. A nitration device for preparing nitrobenzene by utilizing an RTB reactor comprises a microchannel reactor and the RTB reactor, and is characterized in that a first liquid inlet of the microchannel reactor is connected with a mixed acid feed inlet through a first pipeline, a second liquid inlet of the microchannel reactor is connected with an m-dichlorobenzene feed inlet through a second pipeline, and a liquid outlet of the microchannel reactor is communicated with a liquid inlet of the RTB reactor through a pipeline; the first pipeline is provided with a first metering pump, the first metering pump is taken as a node, the upper pipeline of the first pipeline is provided with an overpressure relief device, a first flowmeter, a safety valve, a first one-way valve and a first pressure sensor, and the lower pipeline of the first pipeline is provided with a mixing tank and a three-way ball valve; a second metering pump is arranged on the second pipeline, the second metering pump is taken as a node, an overpressure relief device, a second flowmeter, a safety valve, a second one-way valve and a second pressure sensor are arranged on the upper section of the second pipeline, and a three-way ball valve is arranged on the lower section of the second pipeline; a branch pipe is arranged on the first pipeline and communicated with the mixed acid diffusing pipeline; the second pipeline is provided with a branch pipe communicated with the m-dichlorobenzene diffusing pipeline.

2. The nitrifying device for preparing nitrobenzene by using an RTB reactor according to claim 1, wherein a first mixed acid bleeding branch pipe is provided on a lower pipe on the left side of the first metering pump, a second mixed acid bleeding branch pipe and a third mixed acid bleeding branch pipe are provided on an upper pipe on the right side of the first pressure sensor, and a fourth mixed acid bleeding branch pipe and a fifth mixed acid bleeding branch pipe are provided on an upper pipe on the right side of the first check valve.

3. The nitrification apparatus for preparing nitrobenzene using an RTB reactor according to claim 1, wherein the lower pipe on the left side of the second metering pump is provided with a first m-dichlorobenzene diffusion branch pipe, the upper pipe on the right side of the second pressure sensor is provided with a second m-dichlorobenzene diffusion branch pipe and a third m-dichlorobenzene diffusion branch pipe, and the upper pipe on the right side of the second check valve is provided with a fourth m-dichlorobenzene diffusion branch pipe and a fifth m-dichlorobenzene diffusion branch pipe.

4. The nitrification apparatus for preparing nitrobenzene using an RTB reactor according to claim 1, wherein Y-filters are installed in both the two branch lines of the three-way ball valve.

5. The nitrification apparatus for preparing nitrobenzene using an RTB reactor according to claim 1, wherein the first and second pipelines are in communication with the nitrogen pipeline through a nitrogen branch pipeline and in communication with the flushing pipeline through a flushing branch pipeline.

6. The nitrification apparatus for preparing nitrobenzene using an RTB reactor according to claim 1, wherein the first metering pump and the second metering pump are pulse-free three-pump head diaphragm metering pumps.

7. The nitration apparatus for producing nitrobenzene using RTB reactor according to claim 1 wherein the upper end of the microchannel reactor is in communication with the inlet of the first heat exchange medium and the lower end of the microchannel reactor is in communication with the outlet of the first heat exchange medium; one side of the upper wall of the RTB reactor is communicated with the second heat exchange medium inlet, and the other side of the upper wall of the RTB reactor is communicated with the second heat exchange medium inlet.

8. The nitrification device for preparing nitrobenzene according to claim 1 wherein the microchannel reactor has a first temperature sensor and a second temperature sensor at the upper and lower ends thereof, and a third temperature sensor and a fourth temperature sensor at the left and right ends thereof, the temperature signals being controlled in conjunction with a heat exchange medium pump and valves.

9. The nitrification apparatus for preparing nitrobenzene according to claim 1 wherein the left side of the RTB reactor is connected to the discharge port by a discharge line.