CN218740299U

CN218740299U - Switchable double condenser device for producing a hexafluoropropylene rectification column

Info

Publication number: CN218740299U
Application number: CN202221492650.9U
Authority: CN
Inventors: 韩永丰; 徐�明
Original assignee: Taixing Meilan New Material Co ltd
Current assignee: Taixing Meilan New Material Co ltd
Priority date: 2022-06-16
Filing date: 2022-06-16
Publication date: 2023-03-28
Anticipated expiration: 2032-06-16

Abstract

The utility model discloses a changeable two condenser device for preparing hexafluoropropylene rectifying column, it is equipped with parallel connection's condenser I and condenser II, and condenser I and condenser II carry out the rational connection back, can switch the method of using, make rectification condensing system not receive the influence of ice stifled, guarantee the continuation operation of device, have improved the efficiency of preparation hexafluoropropylene greatly. The utility model discloses an exit of freezing salt solution storage tank is equipped with freezing salt solution pneumatic control valve, can control freezing salt solution output quantity effectively like this, avoids the high temperature in the condenser or crosses low excessively, influences the use of condenser.

Description

Switchable double condenser device for producing a hexafluoropropylene rectification column

Technical Field

The utility model relates to a changeable two condenser device for preparing hexafluoropropylene rectifying column.

Background

Hexafluoropropylene (HFP), a molecular formula CF3CFCF2, is one of the basic materials in the organic fluorine industry, is second only important to tetrafluoroethylene, is a comonomer of many fluorine-containing copolymers, and is an intermediate of many fluorine-containing compounds. The preparation method of the hexafluoropropylene has more ways, the tetrafluoroethylene thermal cracking route is widely adopted for producing the hexafluoropropylene in industrialization, and the hexafluoropropylene has the advantages of simple process and higher product purity.

The technical process and the principle of producing the hexafluoropropylene by the thermal cracking of the tetrafluoroethylene are as follows: tetrafluoroethylene and octafluorocyclobutane (by-product generated by cracking tetrafluoroethylene) are preheated according to a certain proportion and then enter a tubular reactor to be cracked and converted into crude cracked gas. After the crude cracked gas is subjected to quenching and cooling, carbon removal, alkali washing, water washing and silica gel dehydration, the cracked gas containing trace moisture enters a rectification system for purification. The operation temperature of the-35 ℃ frozen brine used by the overhead condenser is below 0 ℃, so that trace water can be frozen on the inner wall of the heat exchange tube, the heat exchange tube is seriously iced after long-term accumulation, the heat exchange effect is seriously influenced, the whole set of device needs to be stopped for deicing treatment, and the yield and the cost are influenced.

Disclosure of Invention

The utility model provides a changeable two condenser device for preparing hexafluoropropene rectifying column, it is with the method of switching use, makes rectification condensing system not receive the influence of ice stifled, guarantees the continuation operation of device.

The utility model adopts the following technical scheme: a switchable double-condenser device for preparing a hexafluoropropylene rectifying tower comprises a condenser I and a condenser II, wherein the condenser I and the condenser II are arranged in parallel, a pyrolysis gas input pipe I and an exhaust pipe I are arranged on the side surface of the upper part of the condenser I, a condensation gas output pipe I is arranged at the top of the condenser I, a pyrolysis gas input pipe II and an exhaust pipe II are arranged on the side surface of the upper part of the condenser II, a condensation gas output pipe II is arranged at the top of the condenser II, a chilled saline water input pipe I is arranged on the side surface of the lower part of the condenser I, a chilled saline water input pipe II is arranged on the side surface of the lower part of the condenser II, the inlet end of the chilled saline water input pipe I and the inlet end of the chilled saline water input pipe II are both communicated with an outlet of a chilled saline water storage tank, and the outlet end of the chilled saline water input pipe I is communicated with the lower part of the condenser I, the outlet end of the frozen brine input pipe II is communicated with the lower portion of the condenser II, a backflow condensate output pipe I is arranged at the bottom of the condenser I, a backflow condensate output pipe II is arranged at the bottom of the condenser II, the backflow condensate output pipe I and the backflow condensate output pipe II are gathered together and then are communicated with a port I of an online water analyzer, the port II of the online water analyzer is communicated with a feed inlet on the side face of the rectifying tower, an output pipeline connected with a discharge outlet at the top of the rectifying tower is divided into two branches, one branch is communicated with an inlet I of the condenser I, the other branch is communicated with an inlet of the condenser II, a condensed water output pipe I is further arranged on the side face of the lower portion of the condenser I, a condensed water output pipe II is further arranged on the side face of the lower portion of the condenser II, and the condensed water output pipe I and the condensed water output pipe II are gathered into a pipeline and then are communicated with a condensed water collecting tank.

The condenser I and the condenser II are both arranged as vertical tubular heat exchangers, wherein the material of the tubular heat exchanger in the vertical tubular heat exchanger is SS304, and the shell of the vertical tubular heat exchanger is carbon steel.

Condensation gas output tube I on be equipped with pressure sensor I and valve I, pressure sensor I is located between the top of valve I and condenser I, condensation gas output tube II on be equipped with pressure sensor II and valve II, pressure sensor II is located between the top of valve II and condenser II.

And a pneumatic adjusting valve for frozen brine is arranged at the outlet of the frozen brine storage tank.

The condensed water collecting tank is made of polypropylene plates.

And a valve III is arranged on the cracking gas input pipe I, and a valve IV is arranged on the cracking gas input pipe II.

And a valve V is arranged on the condensed water output pipe I, and a valve VI is arranged on the condensed water output pipe II.

And a valve VII is arranged on the reflux condensate output pipe I, and a valve VIII and a valve IX are arranged on the reflux condensate output pipe II.

And a valve X is arranged on the exhaust pipe I, and a valve XI is arranged on the exhaust pipe II.

And a valve XII is arranged on one branch of the output pipeline at the top of the rectifying tower, and a valve XIII is arranged on the other branch.

The utility model discloses following beneficial effect has: after having adopted above technical scheme, the utility model discloses be equipped with parallel connection's condenser I and condenser II, condenser I and condenser II carry out the rational connection back, can switch the method of using, make rectification condensing system not receive the influence that ice is stifled, guarantee the continuation operation of device, have improved the efficiency of preparation hexafluoropropylene greatly. The utility model discloses an exit of freezing salt solution storage tank is equipped with freezing salt solution pneumatic control valve, can control freezing salt solution output quantity effectively like this, avoids the high temperature in the condenser or crosses low excessively, influences the use of condenser.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

In fig. 1, the utility model provides a switchable double condenser device for preparing a hexafluoropropylene rectifying tower, which comprises a condenser I1 and a condenser II 2, wherein the condenser I1 and the condenser II 2 are both arranged as a vertical tubular heat exchanger, wherein the material of the tubular heat exchanger is SS304, the shell of the vertical tubular heat exchanger is made of carbon steel, the condenser I1 and the condenser II 2 are arranged in parallel, a pyrolysis gas input pipe I3 and an exhaust pipe I4 are arranged on the side surface of the upper part of the condenser I1, a valve X31 is arranged on the exhaust pipe I4, a valve III 22 is arranged on the pyrolysis gas input pipe I3, a condensation gas output pipe I5 is arranged on the top of the condenser I1, one end of the condensation gas output pipe I5 is connected with the top of the condenser I1, the other end is communicated with the rectifying tower 13, a pressure sensor I17 and a valve I18 are arranged on the condensation gas output pipe I5, the pressure sensor I17 is positioned between the valve I18 and the top of the condenser I1, the side surface of the upper part of the condenser II 2 is provided with a pyrolysis gas input pipe II 6 and an exhaust pipe II 7, the exhaust pipe II 7 is provided with a valve XI 32, the pyrolysis gas input pipe II 6 is provided with a valve IV 23, the top of the condenser II 2 is provided with a condensed gas output pipe II 26, one end of the condensed gas output pipe II 26 is connected with the top of the condenser II 2, the other end of the condensed gas output pipe II 26 is communicated with the rectifying tower 13, the condensed gas output pipe II 26 is provided with a pressure sensor II 19 and a valve II 20, the pressure sensor II 19 is positioned between the valve II 20 and the top of the condenser II 2, the side surface of the lower part of the condenser I1 is provided with a frozen saline water input pipe I8, the side surface of the lower part of the condenser II 2 is provided with a frozen saline water input pipe II 9, and the inlet ends of the frozen saline water input pipe I8 and the frozen saline water input pipe II 9 are both communicated with the outlet of the frozen saline water storage tank 27, the pneumatic adjusting valve 21 for the frozen saline water is arranged at the outlet of the frozen saline water storage tank 27, the condensed water collection tank 16 is made of a polypropylene plate, the outlet end of a frozen saline water input pipe I8 is communicated with the lower portion of the condenser I1, the outlet end of a frozen saline water input pipe II 9 is communicated with the lower portion of the condenser II 2, a reflux condensate output pipe I10 is arranged at the bottom of the condenser I1, a valve VII 28 is arranged on the reflux condensate output pipe I10, a reflux condensate output pipe II 11 is arranged at the bottom of the condenser II 2, a valve VIII 29 and a valve 30 are arranged on the reflux condensate output pipe II, the reflux condensate output pipe I10 and the reflux condensate output pipe II 11 are converged together and then communicated with a port I of the online water analyzer 12, the port II of the online water analyzer 12 is communicated with a feed inlet on the side of the rectifying tower 13, an output pipeline connected with a discharge port at the top of the rectifying tower 13 is divided into two branches, one branch is communicated with an inlet I of the condenser I1, the other branch is communicated with an inlet of the condenser II 2, a valve 33 is arranged on one branch of the output pipeline at the top of the rectifying tower 13, a valve XIII34, a condensed water collection pipeline 14 is arranged on the side of the condensate output pipe I14, a condensed water collection tank I14, a condensed water collection pipeline 14 and a condensed water collection pipeline 14 on the lower portion of the condenser II 14, and a condensed water collection tank II.

The utility model discloses a use does: firstly, frozen brine at-35 ℃ in a frozen brine storage tank 27 enters a condenser I1 through a frozen brine input pipe I8 to condense pyrolysis gas input into the condenser I1, the operating temperature in the condenser I1 is below 0 ℃, after condensation, the condensed pyrolysis gas is discharged from a condensed gas output pipe I5 and then input into a rectifying tower, redundant waste gas is discharged through an exhaust pipe I, reflux condensate generated in the condenser I1 is analyzed through a reflux condensate output pipe I10 and an online water analyzer 12 and then discharged into the rectifying tower 13, condensate generated in the condenser I1 is input into a condensate collecting tank 16 through a condensate output pipe I14 to be collected for later use, condensation of the pyrolysis gas is completed after the operation, but the inner wall of a shell of the condenser I1 is frozen after use, in order to normally condense cracked gas in the process of producing hexafluoropropylene by adopting tetrafluoroethylene cracking, the condenser can be cleaned by adopting a condenser II 2 to carry out condensation treatment according to the process, firstly, frozen brine at-35 ℃ in a frozen brine storage tank 27 enters the condenser II 2 through a frozen brine input pipe II 9 to condense the cracked gas input into the condenser II 2, the operating temperature in the condenser II 2 is below 0 ℃, after condensation, the condensed cracked gas is discharged from a condensed gas output pipe II 26 and then is input into a rectifying tower 13, and redundant waste gas is discharged through an exhaust pipe II 7, and reflux condensate generated in the condenser II 2 passes through a reflux condensate output pipe II 11 and an online water analyzer 12 to form a group in the reflux Divide and carry out the analysis back and discharge into rectifying column 13 in, the comdenstion water that produces in condenser II 2 is inputed into condensate water collection tank 16 through comdenstion water output tube II 15 and is collected for subsequent use, if condenser II 2 also takes place ice stifled, can start the I1 condenser that the clearance was ended, at the in-process of whole switching, comes the break-make of real pipeline through control flap.

Claims

1. A switchable double-condenser device for preparing a hexafluoropropylene rectifying tower is characterized by comprising a condenser I (1) and a condenser II (2), wherein the condenser I (1) and the condenser II (2) are arranged in parallel, a pyrolysis gas input pipe I (3) and an exhaust pipe I (4) are arranged on the side surface of the upper part of the condenser I (1), a condensation gas output pipe I (5) is arranged at the top of the condenser I (1), a pyrolysis gas input pipe II (6) and an exhaust pipe II (7) are arranged on the side surface of the upper part of the condenser II (2), a condensation gas output pipe II (26) is arranged on the top of the condenser II (2), a chilled saline water input pipe I (8) is arranged on the side surface of the lower part of the condenser I (1), a chilled saline water input pipe II (9) is arranged on the side surface of the lower part of the condenser II (2), the inlet end of the chilled saline water input pipe I (8) and the inlet end of the chilled saline water input pipe II (9) are both communicated with an outlet of a chilled saline water storage tank (27), the outlet end of the chilled water input pipe I (8) is communicated with the lower part of the condenser I (1), the chilled water input pipe II (9), a condensate reflux output pipe I (10) is arranged at the bottom of the condenser II (2), the reflux condensate output pipe I (10) and the reflux condensate output pipe II (11) are converged together and then are communicated with a port I of an online water analyzer (12), a port II of the online water analyzer (12) is communicated with a feed inlet on the side surface of a rectifying tower (13), an output pipeline connected with a discharge port at the top of the rectifying tower (13) is divided into two branches, one branch is communicated with an inlet I of a condenser I (1), the other branch is communicated with an inlet of a condenser II (2), a condensate output pipe I (14) is further arranged on the side surface of the lower part of the condenser I (1), a condensate output pipe II (15) is further arranged on the side surface of the lower part of the condenser II (2), and the condensate output pipe I (14) and the condensate output pipe II (15) are converged into a pipeline and then are communicated with a condensate collection tank (16).

2. The switchable twin condenser apparatus for producing a hexafluoropropylene rectification column as set forth in claim 1, wherein the condenser i (1) and the condenser ii (2) are both configured as vertical tubular heat exchangers, wherein the material of the tubular heat exchanger is SS304, and the shell of the vertical tubular heat exchanger is carbon steel.

3. The switchable twin condenser apparatus for producing a hexafluoropropylene rectifier according to claim 1, wherein said condensed gas output pipe i (5) is provided with a pressure sensor i (17) and a valve i (18), the pressure sensor i (17) is located between the valve i (18) and the top of the condenser i (1), said condensed gas output pipe ii (26) is provided with a pressure sensor ii (19) and a valve ii (20), the pressure sensor ii (19) is located between the valve ii (20) and the top of the condenser ii (2).

4. Switchable twin condenser unit for the production of hexafluoropropene rectification columns according to claim 1 characterised in that the chilled brine storage tank (27) has a chilled brine pneumatic regulating valve (21) at its outlet.

5. The switchable twin condenser apparatus for the production of a hexafluoropropene rectification column as claimed in claim 1, characterized in that the condensate collection tank (16) is made of polypropylene plate.

6. The switchable double condenser apparatus of claim 1, wherein the cracked gas input pipe I (3) is provided with a valve III (22), and the cracked gas input pipe II (6) is provided with a valve IV (23).

7. The switchable twin condenser apparatus of claim 1, wherein the condensate outlet pipe I (14) is provided with a valve V (24), and the condensate outlet pipe II (15) is provided with a valve VI (25).

8. A switchable twin condenser apparatus for a distillation column for the production of hexafluoropropene according to claim 1, characterised in that valve VII (28) is provided in return condensate outlet line I (10) and valve VIII (29) and valve IX (30) are provided in return condensate outlet line II.

9. The switchable double condenser apparatus for the preparation of a hexafluoropropene rectification column as claimed in claim 1, characterized in that the valve x (31) is provided on the exhaust pipe i (4) and the valve xi (32) is provided on the exhaust pipe ii (7).

10. The switchable double condenser apparatus of claim 1, characterized in that a valve xii (33) is arranged on one branch of the output pipeline at the top of the distillation column (13) and a valve XIII (34) is arranged on the other branch.