Diphenylethane rectifying still residue evaporation device

Abstract

The utility model relates to a diphenylethane rectifying still residue evaporation device which is characterized in that a still residue pipe is connected below a diphenylethane rectifying still and is conveyed to a jacket evaporator, a scraper stirrer is arranged in the jacket evaporator, the jacket evaporator is externally connected with a vacuumizing device, a jacket of the jacket evaporator is connected with a steam pipeline, and the top of the jacket evaporator is connected with a gas phase material pipe and is connected with a condenser; the condenser is connected with a benzene recovery tank, and the gas-phase material pipe and the kettle residue pipe are respectively connected with two flow paths of the heat energy recovery heat exchanger. Negative pressure evaporation is conducted through the jacket evaporator, the scraper stirrer is matched to be attached to the inner wall of the jacket evaporator to conduct more sufficient and efficient heat exchange with jacket steam, evaporation of benzene gas-phase materials is accelerated, heat energy of the gas-phase materials preheats kettle residues conveyed in the kettle residue pipe through the heat energy recovery heat exchanger, the heat energy is fully utilized, and the heat energy recovery efficiency is improved. The energy consumption of the jacketed evaporator is reduced, the evaporation efficiency is improved, the energy consumption of the condenser is reduced, and the overall recovery treatment cost is reduced.

Description

Technical Field

[0001] The utility model discloses an evaporation device, in particular to a diphenylethane rectification kettle residue evaporation device. Background Art

[0002] In the distillation production of diphenylethane, the distillation kettle residue is a benzene-containing material. The existing recovery and processing technology is to send the kettle residue material to the evaporator reboiler, and the benzene after heating enters the vaporization chamber. The gaseous benzene is condensed and recovered through the heat exchanger, and the liquid phase material is pumped to the falling film evaporator to remove benzene and low-boiling point materials again. The kettle residue material is an intermittent single distillation device, which needs to be equipped with two types of turnover storage tanks: a kettle residue receiving tank and a distilled bottom material tank. The turnover time is long, the heat energy is seriously wasted, and it is not conducive to the rapid and low-energy recovery and processing of the kettle residue. Summary of the invention

[0003] The utility model provides a diphenylethane rectification kettle residue evaporation device which has a simple structure, can continuously perform evaporation and recovery operations, and reduces time and energy consumption costs.

[0004] The technical scheme adopted by the utility model is: a diphenylethane distillation kettle residue evaporation device, comprising an evaporator, a kettle residue pipe connected to the bottom of the diphenylethane distillation kettle to feed the upper part of the evaporator, characterized in that: the evaporator is a jacketed evaporator, a scraper stirrer is arranged inside the jacketed evaporator, a vacuum pumping device is externally connected to the jacket of the jacketed evaporator, the jacket of the jacketed evaporator is connected to a steam pipeline, a gas phase material pipe is connected to the top of the jacketed evaporator to a condenser, the condenser is connected to a benzene recovery tank, and the gas phase material pipe and the kettle residue pipe are respectively connected to two processes of a heat energy recovery heat exchanger.

[0005] The scraper of the scraper stirrer fits the inner wall of the jacket evaporator.

[0006] The scraper of the scraper agitator is a non-vertical structure.

[0007] The outlet pipe of the steam pipe and the residual pipe of the kettle are respectively connected to two processes of the evaporative heat exchanger.

[0008] The vacuum pumping device pumps the jacket evaporator to a negative pressure of 10Kpa.

[0009] The liquid phase material of the jacket evaporator is transferred to the falling film evaporator.

[0010] The utility model uses a jacketed evaporator to perform negative pressure evaporation, and cooperates with a scraper agitator to fit the inner wall of the jacketed evaporator to perform more sufficient and efficient heat exchange with the jacketed steam, thereby accelerating the evaporation of benzene gas phase materials. The heat energy of the gas phase materials is used to preheat the kettle residue transported in the kettle residue pipe through a heat recovery heat exchanger, thereby fully utilizing the heat energy, reducing the energy consumption of the jacketed evaporator, improving the evaporation efficiency, and reducing the energy consumption of the condenser at the same time, thereby reducing the overall recovery and processing cost. The steam pipeline can also be disconnected from the kettle residue pipe through the evaporation heat energy heat exchanger for heat exchange, thereby further utilizing the steam heat energy, thereby achieving better energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Shown is a schematic diagram of the structure of the utility model;

[0012] In the figure: diphenylethane distillation kettle 1, kettle residual pipe 2, jacketed evaporator 3, jacket 4, steam inlet pipeline 5, steam outlet pipeline 6, scraper agitator 7, scraper 8, vacuum device 9, gas phase material pipe 10, condenser 11, benzene recovery tank 12, heat recovery heat exchanger 13, evaporation heat exchanger 14. DETAILED DESCRIPTION

[0013] The following is a further description with reference to the accompanying drawings.

[0014] Figure 1 As shown, a diphenylethane distillation still residue evaporation device includes a jacketed evaporator 3, a steam inlet pipeline 5, a steam outlet pipeline 6, a scraper agitator 7, a vacuum pump 9, a gas phase material pipe 10, a condenser 11, a benzene recovery tank 12, a heat recovery heat exchanger 13, and an evaporation heat exchanger 14. The bottom of the diphenylethane distillation kettle 1 is connected to a kettle residue pipe 2 to feed the upper part of a jacketed evaporator 3. A scraper stirrer 7 is arranged inside the jacketed evaporator 3. The scraper 8 of the scraper stirrer 7 fits the inner wall of the jacketed evaporator and is a non-vertical structure. The jacketed evaporator 3 is externally connected to a vacuum pump 9. The jacket 4 of the jacketed evaporator 3 is respectively connected to a steam inlet pipeline 5 and a steam outlet pipeline 6 above and below. The top of the jacketed evaporator 3 is connected to a gas phase material pipe 10 to a condenser 11. The condenser 11 is connected to a benzene recovery tank 12. The kettle residue pipe 2 first exchanges heat with the steam outlet pipeline 6 through an evaporation heat exchanger 14, and then exchanges heat with the gas phase material pipe 10 through two processes of heat recovery heat exchangers 13.

[0015] Based on this embodiment, the vacuum device draws a negative pressure of preferably 10 KPa on the jacketed evaporator.

[0016] Based on this embodiment, the liquid phase material of the jacket evaporator is sent to the falling film evaporator to remove trace benzene and low boiling point materials again.

Claims

1. A diphenylethane distillation kettle residue evaporation device, comprising an evaporator, a diphenylethane distillation kettle bottom connected to the kettle residue pipe to feed the evaporator top, characterized in that: The evaporator is a jacketed evaporator, a scraper stirrer is arranged inside the jacketed evaporator, a vacuum pump is externally connected to the jacketed evaporator, the jacket of the jacketed evaporator is connected to a steam pipeline, a gas phase material pipe is connected to a condenser at the top of the jacketed evaporator, the condenser is connected to a benzene recovery tank, and the gas phase material pipe and the kettle residue pipe are respectively connected to two processes of a heat energy recovery heat exchanger.

2. A diphenylethane rectification still residue evaporation device according to claim 1, characterized in that: The scraper of the scraper stirrer fits the inner wall of the jacket evaporator.

3. A diphenylethane rectification still residue evaporation device according to claim 1 or 2, characterized in that: The scraper of the scraper agitator is a non-vertical structure.

4. A diphenylethane rectification still residue evaporation device according to claim 1, characterized in that: The outlet pipe of the steam pipe and the residual pipe of the kettle are respectively connected to two processes of the evaporative heat exchanger.

5. A diphenylethane rectification still residue evaporation device according to claim 1, characterized in that: The vacuum pumping device pumps the jacket evaporator to a negative pressure of 10Kpa.

6. A diphenylethane rectification still residue evaporation device according to claim 1, characterized in that: The liquid phase material of the jacket evaporator is transferred to the falling film evaporator.

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