CN202621125U - High-pressure reaction unit - Google Patents

Abstract

The utility model relates to a high-pressure reaction device, in particular to a high-pressure reaction kettle device in which liquid participates in chemical reactions. It solves the technical problems that the existing high-pressure reactors can only react in a closed system, and it is difficult to meet certain needs of continuously feeding gas and continuously discharging tail gas, especially in high-temperature and high-pressure reaction systems where liquids participate in chemical reactions. . The technical solution includes installing a cooling return pipeline on the upper part of the outer body of the high-pressure reactor, so that a large amount of gas generated during the reaction is condensed to form a return flow, and then re-enters the reactor to continue the reaction. In the cooling return pipeline, the gas descending pipeline (10), the condenser (14) and the feed/return tee (18) are connected in sequence, and the flow direction of the gas and the flow direction of the condensed liquid are both vertically downward , making it easier for the condensed liquid to flow back into the reactor to continue the reaction. The cooling return pipeline with this structure has a better cooling effect, improves the conversion rate of the reaction, and saves the cost.

Description

A high pressure reaction device

technical field

The utility model relates to a high-pressure reaction device, in particular to a high-pressure reaction kettle device in which liquid participates in chemical reactions.

Background technique

Existing high-pressure reactors only have a plurality of valves installed on the top or bottom of the reactor for feeding or discharging. During the reaction, all valves are closed, and the reactants are reacted in a closed environment in the kettle body. Reactors with this structure are difficult to meet the requirements of a high-temperature and high-pressure reaction system that needs to continuously feed gas and continuously discharge tail gas. For example, the use of air to oxidize cyclohexane to prepare cyclohexanol and cyclohexanone, because the oxygen content in the air component in the reactor is continuously decreasing, fresh air needs to be continuously replenished, and oxygen-poor air tail gas needs to be continuously discharged at the same time. In addition, because the cyclohexane oxidation reaction is carried out under heat and pressure, usually the reaction temperature is above 120°C, and the boiling point of cyclohexane is 80.7°C, a large amount of cyclohexane will be carried by the air tail gas before it can react in time. out of the reactor. During the production process, it was detected that some cyclohexanol and cyclohexanone were taken out by the air exhaust, causing a lot of waste.

Utility model content

The utility model solves the problem that the existing high-pressure reactors generally can only react in a closed system, and it is difficult to meet certain requirements for continuously feeding gas and continuously discharging tail gas, especially for high-temperature and high-pressure reaction systems where liquids participate in chemical reactions. To solve the problem, a novel high-pressure reactor device is provided.

The utility model provides the following technical solutions: a cooling return pipeline is installed on the upper part of the outer body of the high-pressure reactor. The installed cooling return pipeline mainly includes: the gas uplink pipeline 9 connected with the reactor 2; the gas downlink pipeline 10; the condenser 14; the feed/reflux tee connected by the feed valve 17 and the feed pipe 16 Tube 18.

As a further improvement to the above technical solution, the gas downlink pipeline 10, the condenser 14 and the feed/reflux tee pipe 18 are sequentially connected. In this way, the flow direction of the gas and the flow direction of the condensed liquid are both vertically downward, making it easier for the condensed liquid to flow back into the reactor to continue the reaction.

As a further improvement to the above technical solution, a vent pipe 12 is installed on the upper part of the outer body of the condenser 14. One end of the vent pipe 12 extends out of the condenser 14, and the other end extends into the interior of the condenser 14 and extends downward until close to The bottom of the condenser 14. The condenser with this structure makes the hot gas travel longer in the condensation pipe 13 before being discharged as exhaust gas, and the cooling effect is better.

Compared with the prior art, the utility model has the following advantages: due to the installation of the cooling reflux pipeline, a large amount of gas generated in the reaction process is condensed to form a reflux, which re-enters the reactor to continue the reaction, improves the conversion rate of the reaction, saves costs. In the prior art, the condenser of the laboratory normal pressure reaction device is usually installed between the discharge port and the gas upstream pipeline, and the condensed liquid can flow back into the reactor; but for the high pressure reaction device, the flow direction of the high pressure gas and the condensation The flow direction of the liquid is opposite. Due to the upward push of the high-pressure gas, it is difficult for the condensed liquid to flow back into the reactor to continue the reaction. However, the installation method adopted by the condenser 12 in the reaction device of the present invention makes the flow direction of the gas consistent with the direction of the condensed liquid. The flow direction is all vertically downward, and it is easier for the condensed liquid to flow back into the reactor; in addition, in the reaction device of the present utility model, the internal structure design of the condenser 14 makes the distance that the hot gas is cooled by the condensing pipe 13 increase, and the cooling effect is better. good.

Description of drawings

Fig. 1 is the structural representation of the utility model high-pressure reaction device.

In Fig. 1, 1. Heating jacket; 2. Autoclave; 3. Stirrer; 4. Thermometer casing and thermocouple thermometer; 5. Discharge port; 6. Pressure gauge; 7. Stirring motor; 8.1# return valve ;9. Gas upstream pipeline; 10. Gas downstream pipeline; 11. Vent valve; 12. Vent pipe; 13. Condenser pipe; 14. Condenser; Material valve; 18. Feed/return tee pipe; 19. Autoclave feed valve; 20. Autoclave feed pipe.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described.

The main body of the high-pressure reaction device of the present utility model is a high-pressure reaction kettle, and a cooling return pipeline is installed on the upper part of its outer body. Condenser 14, feed/reflux tee pipe 18, vent pipe 12 and several valves.

Specifically, a heating jacket 1 is installed outside the autoclave 2 , and an agitator 3 , a thermometer sleeve, a thermocouple thermometer 4 and an autoclave feed pipe 20 are installed inside the autoclave 2 . A pressure gauge 6 and a stirring motor 7 are installed on the upper part of the outer body of the autoclave 2 . The upper part of the autoclave 2 has a discharge port 5, which is connected in sequence with the 1# return valve 8, the gas upstream pipeline 9, the gas downstream pipeline 10, the condenser 14, the 2# return valve 15, and the feed/reflux tee Tube 18 and autoclave feed valve 19. The feed pipe 16 is connected with a feed/return tee pipe 18 through a feed valve 17 .

A curved condenser pipe 13 is installed inside the cavity of the condenser 14 . An emptying pipe 12 is installed on the top of the outer body of the condenser 14 . One end of the emptying pipe 12 stretches out of the condenser 14 , and the other end extends into the inside of the condenser 14 and extends downward until close to the bottom of the condenser 14 .

The various arrows in Figure 1 indicate how the system works. Taking the reaction of using air to oxidize cyclohexane as an example, the functions and implementation methods of the technical solution of the present invention will be further described.

(1) When the solid line arrow marks the reaction, the air enters from the feed pipe 16, passes through the feed valve 17 successively, the feed/reflux tee pipe 18, the autoclave feed valve 19, and the autoclave feed pipe 20 enters The reaction kettle reacts with the mixture of cyclohexane and catalyst at the set temperature and pressure. Part of the unreacted cyclohexane, a small amount of cyclohexanol and cyclohexanone are heated and turned into steam, and enter the gas up pipe in sequence with the air tail gas Road 9, gas downlink pipeline 10 and condenser 14, in condenser 14, most of cyclohexane, cyclohexanol and cyclohexanone are cooled to become liquid, pass through 2# reflux valve 15, feed/reflux three The through pipe 18 and the autoclave feed valve 19 flow back into the autoclave 2 to continue to participate in the reaction, which improves the conversion rate of the reaction and saves costs; the air tail gas whose main component is nitrogen is discharged from the vent pipe 12 through the vent valve 11, and passes through Adjusting the vent valve 11 can adjust the flow rate of the discharged tail gas and adjust the pressure inside the reaction system.

(2) dotted line arrow has marked reaction, and the flow direction of cooling medium in condensation tube 13, cooling medium can be salt water or circulating tap water, takes to enter from the bottom inlet of condensation tube 13, discharges from its top outlet.

Of course, the structure of the condenser 14 in the technical solution of the utility model is not limited to the above-mentioned form, if there are other forms, the flow direction of the gas and the flow direction of the condensed liquid are all vertically downward, and the condensed liquid is more likely to flow back Reactor also belongs to the protection scope of the present utility model.

Claims (3)

1. A high-pressure reaction device, characterized in that: a cooling reflux pipeline is installed on the upper part of the high-pressure reactor outer body, and the installed cooling reflux pipeline mainly includes a gas uplink pipeline (9) connected to the reactor (2), Gas down line (10), condenser (14), feed/reflux tee (18) connected through feed valve (17) and feed pipe (16). 2. The high-pressure reaction device according to claim 1, characterized in that: the gas downlink pipeline (10), the condenser (14) and the feed/return three-way pipe (18) are sequentially connected. 3. according to the described high-pressure reactor of claim 1 or 2, it is characterized in that: a vent pipe (12) is installed on the outer body top of the condenser (14), and one end of the vent pipe (12) stretches out of the condenser (14 ) outside, and the other end stretches into the condenser (14) and extends down to the bottom of the condenser (14). the

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