CN108794350A - A method of it improving the utilization rate of two-wire TDI process units distillation systems and reduces stop frequency - Google Patents
A method of it improving the utilization rate of two-wire TDI process units distillation systems and reduces stop frequency Download PDFInfo
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- CN108794350A CN108794350A CN201710284222.4A CN201710284222A CN108794350A CN 108794350 A CN108794350 A CN 108794350A CN 201710284222 A CN201710284222 A CN 201710284222A CN 108794350 A CN108794350 A CN 108794350A
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- tdi
- tower
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C263/00—Preparation of derivatives of isocyanic acid
- C07C263/18—Separation; Purification; Stabilisation; Use of additives
- C07C263/20—Separation; Purification
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- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a kind of utilization rate improving two-wire TDI process units distillation systems and the methods for reducing stop frequency, two-wire TDI process units distillation systems include the first measuring tank for storing TDI crude products, second measuring tank, first measuring tank, second measuring tank is all connected with flash tank, first measuring tank, it is provided with solenoid valve on pipeline between second measuring tank and the flash tank, the flash tank is connected with predistillation tower, predistillation tower side is provided with reboiler, predistillation tower upper end is connected with the first condenser, first condenser connects ODCB recycling cans, the predistillation tower bottom is connected to the middle part of after-fractionating tower by pipeline.Advantageous effect is：The utilization rate that TDI process units can be improved improves the purity of TDI, reduces stop frequency, improves production efficiency.
Description
Technical field
The present invention relates to TDI production fields, more particularly to a kind of utilization improving two-wire TDI process units distillation systems
Rate and the method for reducing stop frequency.
Background technology
The Chinese name of TDI is toluene di-isocyanate(TDI), colourless to weak yellow liquid.There is strong impulse smell, toxic.
Ether, acetone and other certain organic solvents are dissolved in, is acted on water and carbon dioxide occurs, are acted on and linear poly- ammonia with dihydric alcohol
Carbamate and polyurethane resin.TDI is a kind of isocyanates of mixed type.The common TDI of polyurethane industrial be 2,4-TDI and
2,6-TDI two kinds of isomery body mass ratios are 80:20 mixture, current 90% or more TDI are used for the production of soft polyurethane foam,
A small amount of centre as hard polyurethane foam, Polyurethane adhesive/sealing agent, Polyurethane coating and polyurethane elastomer
Body.Polyurethane is considered as the sixth-largest modeling after polyethylene, polyvinyl chloride, polypropylene, polystyrene and ABS by world's chemical circles
Expect that synthetic material, the gradual fashionable whole world have extremely extensive purposes.With Chinese national economy sustained and rapid development, pull
Increasing rapidly for domestic TDI demands, China have become the maximum isocyanates consumption market in the Asian-Pacific area, and are in the world
Most potential area.The TDI purity of output is not high in the production process of TDI at present, cannot reach requirement, and
The harmful substances such as the phosgene inside removing of often stopping are needed, the speed of production and efficiency of TDI are influenced.
Invention content
The purpose of the present invention is that solve the above-mentioned problems and provides a kind of raising two-wire TDI process units rectifying system
The utilization rate of system and the method for reducing stop frequency.
The present invention is achieved through the following technical solutions above-mentioned purpose：
A method of it improving the utilization rate of two-wire TDI process units distillation systems and reduces stop frequency, two-wire TDI lifes
Production device distillation system includes the first measuring tank, the second measuring tank for storing TDI crude products, first measuring tank, described the
Two measuring tanks are all connected with flash tank, are set on the pipeline between first measuring tank, second measuring tank and the flash tank
It is equipped with solenoid valve, the flash tank is connected with predistillation tower, and predistillation tower side is provided with reboiler, described preliminary
Destilling tower upper end is connected with the first condenser, and first condenser connects ODCB recycling cans, and the predistillation tower bottom is logical
Piping is connected to the middle part of after-fractionating tower, and the after-fractionating tower upper end is connected with the second condenser, the second distillation
The middle part of decoking tower is connected to after tower bottom connection phosgene separator, the decoking tower bottom is connected to tar recovery system,
The decoking top of tower is connected to TDI by condenser by being connected to treating column after condenser, at the top of the treating column and recycles
Tank.
In the present embodiment, second condenser is connected with the ODCB recycling cans.
In the present embodiment, the after-fractionating tower, the decoking tower, the treating column side are again provided with reboiler.
In the present embodiment, the bottom of the treating column after connecting a condenser by being communicated to the decoking tower bottom.
In the present embodiment, first measuring tank, second measuring tank interaction conveying TDI crude products.
In the present embodiment, the flash tank, the predistillation tower, the after-fractionating tower, the decoking tower, the essence
Tower processed is equipped with pumped vacuum systems.
In the present embodiment, the method for improving utilization rate of equipment and installations and reducing stop frequency is specially：
(1), the TDI crude products of also TDI, solvent ODCB, tar, phosgene are conveyed from the first measuring tank quantification
To the flash tank；
(2), the gas and liquid exported out of described flash tank is sent into the middle part of the predistillation tower；
(3), pure ODCB is transported in the ODCB recycling cans by first condenser and stores, and carries
Tar, a small amount of ODCB solvents TDI from bottom outflow be transported to the after-fractionating tower；
(4), ODCB solvents are transported to the ODCB after second condenser from the second distillation top of tower and return
Closed cans, the TDI containing tar are being transported to the decoking tower after being transported to the phosgene separator by bottom pipe；
(5), the decoking tower detaches tar and TDI, and tar enters in the tar recovery system, preliminary purification
TDI is transported to the treating column；
(6), the treating column is again separate out tar and flows back into the decoking tower bottom, and the TDI after purification is from the essence
Top of tower processed is transported in the TDI recycling cans；
(7), when the weight of the crude product in first measuring tank is less than 5%, the electricity on first measuring tank
Magnet valve is closed, and the solenoid valve on second measuring tank is opened, defeated into the flash tank using second measuring tank
Send crude product；
(8), the filling TDI crude products again into first measuring tank, when the crude product in second measuring tank not
First measuring tank is restarted when sufficient, then supplements the capacity of the crude product of second measuring tank.
The beneficial effects of the present invention are：The utilization rate that TDI process units can be improved, improves the purity of TDI, and reduction stops
Train number number improves production efficiency.
Description of the drawings
Fig. 1 is a kind of utilization rate improving two-wire TDI process units distillation systems of the present invention and reduces stop frequency
Method production technological process.
The reference numerals are as follows：
1, TDI recycling cans；2, treating column；3, tar recovery system；4, decoking tower；5, after-fractionating tower；6, ODCB is recycled
Tank；7, the first condenser；8, reboiler；9, flash tank；10, the first measuring tank；11, solenoid valve；12, predistillation tower；13,
Two measuring tanks；14, the second condenser；15, phosgene separator.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings：
As shown in Figure 1, the side of a kind of utilization rate improving two-wire TDI process units distillation systems and reduction stop frequency
Method, two-wire TDI process units distillation systems include first measuring tank 10, second measuring tank for storing TDI crude products
13, first measuring tank 10, second measuring tank 13 are all connected with the flash tank 9, first measuring tank 10, described
The solenoid valve 11 is provided on pipeline between two measuring tanks 13 and the flash tank 9, the flash tank 9 is connected with described first
Destilling tower 12 is walked, 12 side of predistillation tower is provided with the reboiler 8, and 12 upper end of the predistillation tower connection is
The first condenser 7 is stated, first condenser 7 connects the ODCB recycling cans 6, and 12 bottom of predistillation tower passes through pipeline
It is connected to the middle part of the after-fractionating tower 5,5 upper end of the after-fractionating tower is connected with second condenser 14, and described two
5 bottom of secondary destilling tower connects the middle part that the decoking tower 4 is connected to after the phosgene separator 15,4 bottom of decoking tower
It is connected to the tar recovery system 3,4 top of the decoking tower is described refined by being connected to the treating column 2 after condenser
2 top of tower is connected to the TDI recycling cans 1 by condenser.
In the present embodiment, second condenser 14 is connected with the ODCB recycling cans 6.
In the present embodiment, the after-fractionating tower 5, the decoking tower 4,2 side of the treating column are again provided with and boil again
Device 8.
In the present embodiment, the bottom of the treating column 2 after connecting a condenser by being communicated to 4 bottom of decoking tower
Portion.
In the present embodiment, first measuring tank 10, second measuring tank 13 interaction conveying TDI crude products.
In the present embodiment, the flash tank 9, the predistillation tower 12, the after-fractionating tower 5, the decoking tower 4,
The treating column 2 is equipped with pumped vacuum systems.
In the present embodiment, the method for improving utilization rate of equipment and installations and reducing stop frequency is specially：
(1), the TDI crude products of also TDI, solvent ODCB, tar, phosgene is defeated from 10 quantification of the first measuring tank
It is sent to the flash tank 9；
(2), the gas and liquid exported out of the flash tank 9 is sent into from 12 middle part of the predistillation tower；
(3), pure ODCB is transported in the ODCB recycling cans 6 by first condenser 7 and stores, and carries
There is tar, the TDI of a small amount of ODCB solvents flows out from bottom and is transported to the after-fractionating tower 5；
(4), ODCB solvents are transported to the ODCB from 5 top of the after-fractionating tower after second condenser 14
Recycling can 6, the TDI containing tar are being transported to the decoking tower after being transported to the phosgene separator 15 by bottom pipe
4；
(5), the decoking tower 4 detaches tar and TDI, and tar enters in the tar recovery system 3, preliminary purification
TDI is transported to the treating column 2；
(6), the treating column 2 is again separate out tar and flows back into 4 bottom of decoking tower, and the TDI after purification is from described
2 top for the treatment of column is transported in the TDI recycling cans 1；
(7), when the weight of the crude product in first measuring tank 10 is less than 5%, the institute on first measuring tank 10
The closing of solenoid valve 11 is stated, the solenoid valve 11 on second measuring tank 13 is opened, using second measuring tank 13 to institute
It states and conveys crude product in flash tank 9；
(8), the filling TDI crude products again into first measuring tank 10, the thick production in second measuring tank 13
First measuring tank 10 is restarted when product deficiency, then supplements the capacity of the crude product of second measuring tank 13.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe the originals of the present invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appending claims and equivalents circle
It is fixed.
Claims (7)
1. a kind of utilization rate improving two-wire TDI process units distillation systems and the method for reducing stop frequency, it is characterised in that：
Two-wire TDI process units distillation systems include the first measuring tank, the second measuring tank for storing TDI crude products, first metering
Tank, second measuring tank are all connected with flash tank, between first measuring tank, second measuring tank and the flash tank
Solenoid valve is provided on pipeline, the flash tank is connected with predistillation tower, and predistillation tower side is provided with reboiler,
Predistillation tower upper end is connected with the first condenser, and first condenser connects ODCB recycling cans, the predistillation
Tower bottom is connected to the middle part of after-fractionating tower by pipeline, and the after-fractionating tower upper end is connected with the second condenser, described
The middle part of decoking tower is connected to after second distillation tower bottom connection phosgene separator, the decoking tower bottom is connected to tar and returns
Receiving apparatus, the decoking top of tower are connected at the top of the treating column by condenser by being connected to treating column after condenser
TDI recycling cans.
2. a kind of utilization rate improving two-wire TDI process units distillation systems according to claim 1 and reduction parking time
Several methods, it is characterised in that：Second condenser is connected with the ODCB recycling cans.
3. a kind of utilization rate improving two-wire TDI process units distillation systems according to claim 1 and reduction parking time
Several methods, it is characterised in that：The after-fractionating tower, the decoking tower, the treating column side are again provided with reboiler.
4. a kind of utilization rate improving two-wire TDI process units distillation systems according to claim 1 and reduction parking time
Several methods, it is characterised in that：The bottom of the treating column after connecting a condenser by being communicated to the decoking tower bottom.
5. a kind of utilization rate improving two-wire TDI process units distillation systems according to claim 1 and reduction parking time
Several methods, it is characterised in that：First measuring tank, second measuring tank interaction conveying TDI crude products.
6. a kind of utilization rate improving two-wire TDI process units distillation systems according to claim 1 and reduction parking time
Several methods, it is characterised in that：It is the flash tank, the predistillation tower, the after-fractionating tower, the decoking tower, described
Treating column is equipped with pumped vacuum systems.
7. a kind of utilization rate improving two-wire TDI process units distillation systems according to claim 1 and reduction parking time
Several methods, it is characterised in that：Raising utilization rate of equipment and installations and the method for reducing stop frequency are specially：
(1), the TDI crude products of also TDI, solvent ODCB, tar, phosgene are transported to institute from the first measuring tank quantification
State flash tank；
(2), the gas and liquid exported out of described flash tank is sent into the middle part of the predistillation tower；
(3), pure ODCB is transported in the ODCB recycling cans by first condenser and stores, and carries coke
From bottom, outflow is transported to the after-fractionating tower to the TDI of oily, a small amount of ODCB solvents；
(4), ODCB solvents are transported to the ODCB recycling cans from the second distillation top of tower after second condenser,
TDI containing tar is being transported to the decoking tower after being transported to the phosgene separator by bottom pipe；
(5), the decoking tower detaches tar and TDI, and tar enters in the tar recovery system, and the TDI of preliminary purification is defeated
It is sent to the treating column；
(6), the treating column is again separate out tar and flows back into the decoking tower bottom, and the TDI after purification is from the treating column
Top is transported in the TDI recycling cans；
(7), when the weight of the crude product in first measuring tank is less than 5%, the solenoid valve on first measuring tank
It closes, the solenoid valve on second measuring tank is opened, and is conveyed slightly into the flash tank using second measuring tank
Product；
(8), the filling TDI crude products again into first measuring tank, when the crude product deficiency in second measuring tank
First measuring tank is restarted, the capacity of the crude product of second measuring tank is then supplemented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710284222.4A CN108794350A (en) | 2017-04-26 | 2017-04-26 | A method of it improving the utilization rate of two-wire TDI process units distillation systems and reduces stop frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710284222.4A CN108794350A (en) | 2017-04-26 | 2017-04-26 | A method of it improving the utilization rate of two-wire TDI process units distillation systems and reduces stop frequency |
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| Publication Number | Publication Date |
|---|---|
| CN108794350A true CN108794350A (en) | 2018-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710284222.4A Pending CN108794350A (en) | 2017-04-26 | 2017-04-26 | A method of it improving the utilization rate of two-wire TDI process units distillation systems and reduces stop frequency |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101827812A (en) * | 2007-11-14 | 2010-09-08 | 三井化学株式会社 | Process for producing polyisocyanate |
| CN101890249A (en) * | 2010-07-22 | 2010-11-24 | 蓝仁水 | Energy-saving process method for rectifying and separating three fractions |
-
2017
- 2017-04-26 CN CN201710284222.4A patent/CN108794350A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101827812A (en) * | 2007-11-14 | 2010-09-08 | 三井化学株式会社 | Process for producing polyisocyanate |
| CN101890249A (en) * | 2010-07-22 | 2010-11-24 | 蓝仁水 | Energy-saving process method for rectifying and separating three fractions |
Non-Patent Citations (1)
| Title |
|---|
| 田志亮: "甲苯二异氰酸酯分离工艺的模拟与优化", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
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Application publication date: 20181113 |
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