CN218854308U - Falling film cracking reactor for cracking boron trifluoride complex - Google Patents

Abstract

The utility model provides a falling liquid film pyrolysis reactor for schizolysis of boron trifluoride complex, the reactor comprises a reactor body, reactor body top-down divide into reaction section and heating section, evenly be equipped with a plurality of reaction tubulations that are vertical setting in the reaction section, be equipped with the heat transfer intermediate layer between reaction tubulation and the reaction section outer wall, the reaction section lateral wall still is equipped with the feed inlet with reaction tubulation intercommunication, and the reaction section top is equipped with the gaseous phase discharge gate, heat transfer intermediate layer lower extreme intercommunication has the heat medium import, and the upper end intercommunication has the heat medium export, be equipped with heating device in the heating section, the heating section bottom is equipped with the liquid phase discharge gate. Falling liquid film pyrolysis reactor utilize the schizolysis raw materials to descend at the reaction shell and tube inner wall and form the even liquid film of thickness, through the temperature of heating device with heat medium control reaction shell and tube, improved the schizolysis degree, reduced the time of being heated of raw materials, reduced manufacturing cost.

Description

Falling film cracking reactor for cracking boron trifluoride complex

Technical Field

The utility model belongs to the pyrolysis reactor field especially relates to a falling film pyrolysis reactor that is used for boron trifluoride complex schizolysis.

Background

In a broad sense, all reactions in which organic compounds are decomposed at high temperature are called cracking. However, since steam is the most used thermal cracking process in the modern petrochemical industry, it is a common practice that "cracking" in the mouth is usually referred to as thermal cracking unless otherwise specified.

The industrial commonly used cracker includes tubular cracker, kettle cracker, bed cracker and tower cracker. It is a characteristic of the cracker that heat is transferred to the reaction mass in a short time so that the cracking reaction proceeds rapidly. The cracking reaction has four main points: (1) the cracking reaction is endothermic; (2) the reaction temperature is high; (3) the retention time is short; (4) the partial pressure of the light component gas phase is low.

Cracking plants can be broadly divided into two general categories, depending on the means and manner of heat transfer:

one is external heating. I.e., by some medium, heat is transferred to the reaction feed. According to different heat transfer media, the method can be divided into three types, namely (1) a molten salt furnace, a heat storage furnace, a sand furnace and the like, which are used as heat carriers through circulating or fixed media; (2) a tubular reactor with metal pipe wall as medium; (3) the superheated steam reactor uses high-temperature gas such as superheated steam as a medium.

The other is internal heat type. That is, not by the medium, but by combustion of a portion of the material, heat is generated to supply another portion of the heat required for cracking the feedstock. The heat comes from the material itself, so it is called internal heat type.

Boron trifluoride and anisole can react at normal temperature to generate a complex of boron trifluoride and anisole, which is stable under natural conditions, but can generate cracking reaction to generate boron trifluoride and anisole after being heated, and anisole can generate various substances of phenol, ether and alcohol of other benzene rings under the condition of being heated too high or too long, which is not beneficial to recycling of anisole and influences the subsequent reaction effect.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a falling liquid film pyrolysis reactor for pyrolysis of boron trifluoride complex can be applicable to the pyrolysis of boron trifluoride complex, improves the schizolysis degree, reduces the energy consumption, shortens reaction time, and it takes place to reduce side reaction.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a falling film cracking reactor for cracking boron trifluoride complex comprises a reactor body, wherein the reactor body is divided into a reaction section and a heating section from top to bottom, a plurality of reaction tubes which are vertically arranged are uniformly arranged in the reaction section, the upper ends and the lower ends of the reaction tubes can be connected with the reactor body through a distribution disc, a heat exchange interlayer is arranged between the reaction tubes and the outer wall of the reaction section, a heat medium is filled in the heat exchange interlayer, the side wall of the reaction section is also provided with a feed inlet communicated with the reaction tubes, the top of the reaction section is provided with a gas-phase discharge hole, the lower end of the heat exchange interlayer is communicated with a heat medium inlet, the upper end of the heat exchange interlayer is communicated with a heat medium outlet, the tube wall of the reaction tubes is cooled through the heat medium flowing in the heat exchange interlayer, and proper temperature is maintained,

the heating section is internally provided with a heating device, the heating device is used for supplementing heat required by the cracking reaction in the reactor body and maintaining the reaction, the bottom of the heating section is provided with a liquid phase discharge port, and a liquid phase product produced by the cracking reaction flows out of the liquid phase discharge port.

The utility model discloses a falling liquid film pyrolysis reactor's essence is one kind and utilizes the schizolysis raw materials to descend along the reaction shell and tube inner wall under the action of gravity and forms the even liquid film of thickness, and the liquid film passes through the heating of reaction shell and tube wall next door, and the raw materials liquid that descends along the reaction shell and tube inner wall contacts a thermal cracking response device with the gaseous adverse current of high temperature saturation boron trifluoride that the schizolysis produced.

Further, heating device includes heating pipe and heating rod, the heating pipe stretches into in the heating section, is equipped with the conduction oil in the heating pipe, the heating rod inserts in the heating pipe and the heating rod can dismantle sealing connection with the heating pipe, can dismantle sealing connection's mode and do not do the injecing, can be threaded connection also can be through sealing plug connection etc..

Furthermore, an oil drain pipe is arranged at the bottom of the heating pipe and used for draining heat conduction oil in the heating pipe, an oil level viewing mirror is communicated with the heating pipe and used for monitoring the oil level of the heat conduction oil in the heating pipe, and when the oil level of the heat conduction oil is low, the heat conduction oil is replenished in time.

Further, the length of the reactor body is 12-14 m, the reaction time of the boron trifluoride complex is controlled to be 8-10S through the length of the reactor body, the reaction time is accurately controlled, and the phenomenon that the heating time is too long is avoided.

Furthermore, a thermometer is arranged in the heating section and used for monitoring that the heating temperature in the heating section is in a proper range, when the heating temperature is too high, anisole is easy to react, and when the heating temperature is too low, the cracking degree of a boron trifluoride complex is reduced; preferably, the temperature in the heating section is between 90 and 160 ℃.

Compared with the prior art, the falling film cracking reactor for cracking the boron trifluoride complex has the following advantages:

(1) The falling film cracking reactor for cracking the boron trifluoride complex compound utilizes the cracking raw material to descend on the inner wall of the reaction tube array to form a liquid film with uniform thickness, controls the temperature of the reaction tube array through the heating device and the heating medium, improves the cracking degree, reduces the heating time of the raw material and reduces the production cost;

(2) A gaseous phase product that is used for falling liquid film schizolysis reactor of boron trifluoride complex schizolysis to produce in the reaction process passes the reaction shell and tube and discharges from the reactor upper end, is convenient for collect, and can realize thermal recycle, more help reducing the energy consumption.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of a falling film cracking reactor according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a reaction tube according to an embodiment of the present invention.

Description of reference numerals:

1. a reaction section; 2. a heating section; 3. a reaction tube array; 4. a feed inlet; 5. a gas phase discharge port; 6. a heating medium inlet; 7. a heating medium outlet; 8. a liquid phase discharge port; 9. heating a tube; 10. discharging an oil pipe; 11. an oil level sight glass; 12. a thermometer.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in figure 1, the falling film cracking reactor for cracking boron trifluoride complex comprises a reactor body which is divided into a reaction section 1 and a heating section 2 from top to bottom, as shown in figure 2, a plurality of reaction tubes 3 which are vertically arranged are uniformly arranged in the reaction section 1, the upper ends and the lower ends of the reaction tubes 3 are connected with the reactor body through a distribution plate, a heat exchange interlayer is arranged between the reaction tubes 3 and the outer wall of the reaction section 1, a heating medium is filled in the heat exchange interlayer, a feed inlet 4 communicated with the reaction tubes 3 is also arranged on the side wall of the reaction section 1, a gas phase discharge outlet 5 is arranged at the top of the reaction section 1, a heating medium inlet 6 is communicated at the lower end of the heat exchange interlayer, and a heating medium outlet 7 is communicated at the upper end,

be equipped with heating device in the heating section 2, 2 bottoms in heating section are equipped with liquid phase discharge gate 8, and heating device includes heating pipe 9 and heating rod, and in heating pipe 9 stretched into heating section 2, the conduction oil was equipped with in the heating pipe 9, and the heating rod inserted in heating pipe 9 and heating rod and 9 threaded connection of heating pipe, and heating pipe 9 bottom was equipped with puts oil pipe 10, and the intercommunication has oil level sight glass 11 on the heating pipe 9, still is equipped with thermometer 12 in the heating section 2.

Use in this embodiment the utility model discloses a falling liquid film pyrolysis reactor is used for boron trifluoride anisole's complex schizolysis preparation boron trifluoride, the complex gets into the reactor body by feed inlet 4, in the even entering reaction tubulation 3 of distribution disc through reaction tubulation 3 upper end, receive the effect of gravity and flow along reaction tubulation 3 downwards, form even liquid film at reaction tubulation 3 inner wall, heating device heats the schizolysis to the boron trifluoride complex that flows into the reactor body, boron trifluoride that the schizolysis produced becomes gaseous upwards to pass reaction tubulation 3 and finally takes out from gaseous discharge gate 5, liquid phase anisole then takes out from the liquid phase discharge gate 8 of reactor body bottom, boron trifluoride gas rises the in-process, and take place the heat exchange along taking place between the liquid film of reaction tubulation 3 downward flow, heat medium and the reaction tubulation 3 in the heat transfer intermediate layer take place the heat exchange simultaneously, take away unnecessary heat, maintain the temperature of reaction tubulation 3, can realize the accurate control to schizolysis degree and reaction time through the length of control reactor body and the temperature of heating section 2, can be applicable to serialization production simultaneously.

In the embodiment, the length of the reactor body is 13 meters, the reaction time of the boron trifluoride complex is controlled to be 9.1S through the length of the reactor body, the flow rate of the boron trifluoride complex injected into the feed inlet 4 is 16.85kg/h, the flow rate of the liquid phase discharge port 8 is 9.95kg/h, the flow rate of the gas phase discharge port 5 is 6.63kg/h, the feeding temperature of the boron trifluoride complex is 115 ℃, the temperature of the heating section 2 is 155.8 ℃ monitored by the thermometer 12, the wall temperature of the reaction tube 3 is close to the boiling temperature, the feeding temperature of the heating medium is 75 ℃, the pressure drop of the falling film cracking reactor is 0.72kpa, and the cracking degree of the boron trifluoride complex is calculated to be more than 99.99%.

Claims (5)

1. A falling film cracking reactor for cracking boron trifluoride complex, characterized by: comprises a reactor body, the reactor body is divided into a reaction section and a heating section from top to bottom, a plurality of reaction tubes which are vertically arranged are uniformly arranged in the reaction section, a heat exchange interlayer is arranged between the reaction tubes and the outer wall of the reaction section, the side wall of the reaction section is also provided with a feed inlet which is communicated with the reaction tubes, the top of the reaction section is provided with a gas phase discharge outlet, the lower end of the heat exchange interlayer is communicated with a heat medium inlet, the upper end of the heat exchange interlayer is communicated with a heat medium outlet,

and a heating device is arranged in the heating section, and a liquid phase discharge hole is formed in the bottom of the heating section.

2. The falling film cracking reactor for boron trifluoride complex cracking according to claim 1, characterized in that: the heating device comprises a heating pipe and a heating rod, the heating pipe extends into the heating section, heat conduction oil is filled in the heating pipe, the heating rod is inserted into the heating pipe, and the heating rod is detachably and hermetically connected with the heating pipe.

3. The falling film cracking reactor for boron trifluoride complex cracking according to claim 2, characterized in that: an oil drain pipe is arranged at the bottom of the heating pipe, and an oil level sight glass is communicated with the heating pipe.

4. The falling film cracking reactor for boron trifluoride complex cracking according to claim 1, characterized in that: the length of the reactor body is 12-14 meters.

5. The falling film cracking reactor for boron trifluoride complex cracking according to claim 1, characterized in that: a thermometer is arranged in the heating section.

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