CN217612999U - Energy-saving polyvinyl alcohol rectifying device - Google Patents
Energy-saving polyvinyl alcohol rectifying device Download PDFInfo
- Publication number
- CN217612999U CN217612999U CN202222478098.4U CN202222478098U CN217612999U CN 217612999 U CN217612999 U CN 217612999U CN 202222478098 U CN202222478098 U CN 202222478098U CN 217612999 U CN217612999 U CN 217612999U
- Authority
- CN
- China
- Prior art keywords
- tower
- rectifying tower
- rectifying
- outlet
- heat source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The utility model discloses an energy-conserving polyvinyl alcohol rectifier unit, including first rectifying column, second rectifying column, third rectifying column, fourth rectifying column, fifth rectifying column, sixth rectifying column, seventh rectifying column, eighth rectifying column, eleventh rectifying column and twelfth rectifying column, above-mentioned rectifying column all is equipped with the feed inlet, and the export is adopted at the top of the tower, the backward flow mouth, and export and tower cauldron reboiler are adopted to the tower cauldron, and this device includes original rectification system and from backheating system. The utility model discloses increased from backheating smart flow system, used for the tower cauldron with the heat recovery of top of the tower steam, saved the quantity of tower cauldron live steam greatly, saved the quantity of top of the tower recirculated cooling water simultaneously, not only energy-conservation but also environmental protection.
Description
Technical Field
The utility model belongs to the technical field of the chemical industry is energy-conserving, concretely relates to energy-conserving polyvinyl alcohol rectifier unit.
Background
The PVA (polyvinyl alcohol) industry in China has been the largest PVA producing country in the world after more than 40 years of development, and has 14 PVA producing enterprises in technical routes of petroleum ethylene method, natural gas acetylene method, calcium carbide acetylene method and the like. In the next few years, the domestic PVA demand will increase at a relatively steady speed, and the growth rate will reach 6.4%.
Polyvinyl alcohol is an important chemical raw material, and is used for manufacturing polyvinyl acetal, gasoline-resistant pipelines, vinylon, fabric treating agents, emulsifiers, paper coatings, adhesives, glue and the like.
The main production processes of PVA are as follows: acetylene process, synthesis process, polymerization process, saponification and alcoholysis process and recovery process.
The main task of the recovery process is to recycle the waste liquid generated in the previous saponification and alcoholysis process by adopting a rectification method, wherein the main components of the waste liquid comprise methanol, methyl acetate, sodium acetate and acetaldehyde.
The rectification process in the recovery process is the part with higher energy consumption of the whole production device, and the reduction of the energy consumption of the process becomes the problem to be solved urgently under the environment with rising energy price.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide an energy-saving polyvinyl alcohol rectifying device.
The utility model discloses a realize through following technical scheme:
the utility model provides an energy-conserving polyvinyl alcohol rectifier unit, includes first rectifying column, second rectifying column, third rectifying column, fourth rectifying column, fifth rectifying column, sixth rectifying column, seventh rectifying column, eighth rectifying column, eleventh rectifying column and twelfth rectifying column, and above-mentioned rectifying column all is equipped with the feed inlet, and the export is adopted to the top of the tower steam, and the export is adopted to the top of the tower, the backward flow mouth, and export and tower cauldron reboiler are adopted to the tower cauldron, a serial communication port, include original rectifying system and from backheating system, original rectifying system includes: the top of the tower of the first rectifying tower is connected with the feed inlet of the second rectifying tower, the bottom of the tower of the first rectifying tower is connected with the feed inlet of the fourth rectifying tower,
a first preheater is arranged on a feed pipeline of the first rectifying tower, a second preheater is arranged between a tower kettle extraction port of the first rectifying tower and a feed inlet of the fourth rectifying tower,
a tower bottom extraction outlet of the second rectifying tower is connected with a feed inlet of the third rectifying tower, a tower top extraction outlet of the second rectifying tower is connected with a feed inlet of the twelfth rectifying tower,
the top of the third rectifying tower is provided with an outlet which is respectively connected with a heat source inlet of the first feed preheater and a heat source inlet of the second feed preheater, a heat source outlet of the first feed preheater is connected with a tank area recycling port, a heat source outlet of the second preheater is connected with a feed port of the fourth rectifying tower,
a tower kettle extraction outlet of the fourth rectifying tower is connected with a feed inlet of the third rectifying tower,
the feed inlet of the fifth rectifying tower is connected with the tower kettle extraction outlet of the twelfth rectifying tower, the tower kettle extraction outlet of the fifth rectifying tower is connected with the feed inlet of the sixth rectifying tower, the tower top extraction outlet of the fifth rectifying tower is connected with the feed inlet of the second rectifying tower,
a tower top extraction outlet of the sixth rectifying tower is connected with a feed inlet of a seventh rectifying tower, a tower top extraction outlet of the seventh rectifying tower is connected with a feed inlet of an eighth rectifying tower,
a tower top extraction outlet of the twelfth rectifying tower is connected with a feed inlet of the eleventh rectifying tower, and a tower kettle extraction outlet of the eleventh rectifying tower is connected with a feed inlet of the second rectifying tower;
the self-regenerative system comprises:
the tower top steam outlet of the second rectifying tower is connected with the heat source inlet of the tower top condenser of the second rectifying tower, the heat source outlet of the tower top condenser of the second rectifying tower is connected with the reflux port of the second rectifying tower, the tower top steam outlet of the second rectifying tower is also connected with a second rectifying tower compressor, the outlet of the second rectifying tower compressor is connected with the heat source inlet of a tower kettle reboiler of the second rectifying tower, the heat source outlet of the tower kettle reboiler of the second rectifying tower is connected with the heat source inlet of a cooler of the second rectifying tower, and the heat source outlet of the cooler of the second rectifying tower is connected with the reflux port of the second rectifying tower;
the tower top steam outlet of the fifth rectifying tower is connected with a fifth rectifying tower compressor, the outlet of the fifth rectifying tower compressor is connected with the heat source inlet of a tower kettle reboiler of the fifth rectifying tower, the heat source outlet of the tower kettle reboiler of the fifth rectifying tower is connected with the heat source inlet of a cooler of the fifth rectifying tower, and the heat source outlet of the cooler of the fifth rectifying tower is connected with the reflux port of the fifth rectifying tower;
the tower top steam outlet of the sixth rectifying tower is connected with a sixth rectifying tower compressor, the outlet of the sixth rectifying tower compressor is connected with the heat source inlet of a tower kettle reboiler of the sixth rectifying tower, the heat source outlet of the tower kettle reboiler of the sixth rectifying tower is connected with the heat source inlet of a cooler of the sixth rectifying tower, and the heat source outlet of the cooler of the sixth rectifying tower is connected with the reflux port of the sixth rectifying tower;
and a tower top steam outlet of the twelfth rectifying tower is connected with a compressor of the twelfth rectifying tower, an outlet of the compressor of the twelfth rectifying tower is connected with a heat source inlet of a tower kettle reboiler of the twelfth rectifying tower, a heat source outlet of the tower kettle reboiler of the twelfth rectifying tower is connected with a heat source inlet of a cooler of the twelfth rectifying tower, and a heat source outlet of the cooler of the twelfth rectifying tower is connected with a reflux port of the twelfth rectifying tower.
In the technical scheme, the tower kettle reboiler is in a horizontal pipe falling film type.
In the above technical scheme, the second rectifying tower compressor, the fifth rectifying tower compressor, the sixth rectifying tower compressor and the twelfth rectifying tower compressor are twin-screw compressors, centrifugal compressors or roots compressors.
The fifth rectifying tower, the sixth rectifying tower and the twelfth rectifying tower are all provided with reflux tanks, the reflux tanks are all provided with a liquid outlet, the liquid outlet of the reflux tank of the second rectifying tower is connected with a second spray pump, the outlet of the second spray pump is connected with the outlet of the compressor of the second rectifying tower,
a liquid outlet of a reflux tank of the fifth rectifying tower is connected with a fifth spray pump, an outlet of the fifth spray pump is connected with an outlet of a compressor of the fifth rectifying tower,
a liquid outlet of a reflux tank of the sixth rectifying tower is connected with a sixth spray pump, an outlet of the sixth spray pump is connected with an outlet of a compressor of the sixth rectifying tower,
and a liquid outlet of a reflux tank of the twelfth rectifying tower is connected with a twelfth spray pump, and an outlet of the twelfth spray pump is connected with an outlet of the compressor of the twelfth rectifying tower and used for eliminating superheated steam.
In the above technical solution, the fifth rectifying tower is provided with a fifth supplementary reboiler, and the sixth rectifying tower is provided with a sixth supplementary reboiler.
The utility model discloses an advantage and beneficial effect do:
1. the technical scheme of the utility model among, do self-backheating rectification respectively with second, fifth, sixth and twelfth rectifying column, be about to top of the tower steam and adopt the method of mechanical compression to heat the pressure boost and make its and the heat source of tower cauldron heat match and regard as the reboiler, saved the use of a large amount of live steam, saved the quantity of top of the tower recirculated cooling water simultaneously, make device energy consumption greatly reduced.
2. The technical scheme of the utility model energy-conserving effect is showing, compares with prior art, can practice thrift 46 tons live steam per hour under the equal heat load, can practice thrift operating cost 4 thousands of yuan all the year round, and economic benefits is considerable.
Drawings
Fig. 1 is a flowchart of embodiment 1 of the present invention;
fig. 2 is a flowchart of embodiment 1 of the present invention (shown in fig. 1);
fig. 3 is a flowchart of embodiment 2 of the present invention;
fig. 4 is a flowchart of embodiment 2 of the present invention;
fig. 5 is a flowchart of embodiment 2 of the present invention;
fig. 6 is a flowchart of embodiment 2 of the present invention.
Wherein, 1 is a first rectifying tower, 2 is a second rectifying tower, 3 is a third rectifying tower, 4 is a fourth rectifying tower, 5 is a fifth rectifying tower, 6 is a sixth rectifying tower, 7 is a seventh rectifying tower, 8 is an eighth rectifying tower, 9 is a first preheater, 10 is a second preheater, 11 is an eleventh rectifying tower, 12 is a twelfth rectifying tower, 13 is a thirteenth rectifying tower, 2-1 is a second rectifying tower top condenser, 2-2 is a second rectifying tower compressor, 2-3 is a second rectifying tower reboiler, 2-4 is a second rectifying tower cooler, 5-1 is a fifth rectifying tower compressor, 5-2 is a fifth rectifying tower kettle, 5-3 is a fifth rectifying tower cooler, 5-4 is a fifth rectifying tower reboiler, 6-2 is a sixth rectifying tower compressor, 6-3 is a sixth rectifying tower cooler, 6-4 is a sixth rectifying tower reboiler, 6-12 is a twelfth rectifying tower reboiler, 12 is a twelfth rectifying tower reboiler.
Detailed Description
In order to make the technical field of the present invention better understand, the technical solutions of the present invention are further described below with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 1 and fig. 2, a polyvinyl alcohol rectification device comprises a first rectification column 1, a second rectification column 2, a third rectification column 3, a fourth rectification column 4, a fifth rectification column 5, a sixth rectification column 6, a seventh rectification column 7, an eighth rectification column 8, an eleventh rectification column 11 and a twelfth rectification column 12 (a thirteenth rectification column 13 is connected in series with the twelfth rectification column), wherein the rectification columns are provided with a feed inlet, a top steam outlet, a reflux port, a bottom extraction outlet, a top condenser and a reboiler, the top extraction outlet of the first rectification column is connected with the feed inlet of the second rectification column, the bottom extraction outlet of the first rectification column is connected with the feed inlet of the fourth rectification column,
a first preheater 9 is arranged on a feed pipeline of the first rectifying tower, a second preheater 10 is arranged between a tower kettle extraction outlet of the first rectifying tower and a feed inlet of the fourth rectifying tower,
the tower bottom extraction outlet of the second rectifying tower is connected with the feed inlet of the third rectifying tower, the tower top extraction outlet of the second rectifying tower is connected with the feed inlet of the twelfth rectifying tower,
the top of the third rectifying tower is connected with the heat source inlet of the first feed preheater and the heat source inlet of the second feed preheater respectively, the heat source outlet of the first feed preheater is connected with the tank area recovery port, the heat source outlet of the second preheater is connected with the feed inlet of the fourth rectifying tower,
the tower bottom extraction outlet of the fourth rectifying tower is connected with the feed inlet of the third rectifying tower,
a feed inlet of the fifth rectifying tower is connected with a tower bottom extraction outlet of the twelfth rectifying tower, a tower bottom extraction outlet of the fifth rectifying tower is connected with a feed inlet of the sixth rectifying tower, a tower top extraction outlet of the fifth rectifying tower is connected with a feed inlet of the second rectifying tower,
a tower top extraction outlet of the sixth rectifying tower is connected with a feed inlet of the seventh rectifying tower, a tower top extraction outlet of the seventh rectifying tower is connected with a feed inlet of the eighth rectifying tower,
the top of the tower of the twelfth rectifying tower is connected with the feed inlet of the eleventh rectifying tower, and the bottom of the tower of the eleventh rectifying tower is connected with the feed inlet of the second rectifying tower.
Example 2
In this embodiment, an auto-regenerative system is added to embodiment 1, and the auto-regenerative system includes: the top steam outlet of the second rectifying tower is connected with the heat source inlet of a top condenser 2-1 of the second rectifying tower, the heat source outlet of the top condenser of the second rectifying tower is connected with the reflux port of the second rectifying tower, the top steam outlet of the second rectifying tower is also connected with a compressor 2-2 of the second rectifying tower, the outlet of the compressor of the second rectifying tower is connected with the heat source inlet of a kettle reboiler 2-3 of the second rectifying tower, the heat source outlet of the kettle reboiler of the second rectifying tower is connected with a cooler 2-4 of the second rectifying tower, and the heat source outlet of the cooler of the second rectifying tower is connected with the reflux port of the second rectifying tower;
a tower top steam outlet of the fifth rectifying tower is connected with a fifth rectifying tower compressor 5-1, an outlet of the fifth rectifying tower compressor is connected with a heat source inlet of a tower kettle reboiler of the fifth rectifying tower, a heat source outlet of the tower kettle reboiler 5-2 of the fifth rectifying tower is connected with a fifth rectifying tower cooler 5-3, and a heat source outlet of the fifth rectifying tower cooler is connected with a reflux port of the fifth rectifying tower;
a tower top steam outlet of the sixth rectifying tower is connected with a sixth rectifying tower compressor 6-2, an outlet of the sixth rectifying tower compressor is connected with a heat source inlet of a sixth rectifying tower kettle reboiler 6-3, a heat source outlet of the sixth rectifying tower kettle reboiler is connected with a sixth rectifying tower cooler 6-4, and a heat source outlet of the sixth rectifying tower cooler is connected with a reflux port of the sixth rectifying tower;
the tower top steam outlet of the twelfth rectifying tower is connected with a twelfth rectifying tower compressor 12-2, the outlet of the twelfth rectifying tower compressor is connected with the heat source inlet of a twelfth rectifying tower kettle reboiler 12-3, the heat source outlet of the twelfth rectifying tower kettle reboiler is connected with a twelfth rectifying tower cooler 12-4, and the heat source outlet of the twelfth rectifying tower cooler is connected with the reflux port of the twelfth rectifying tower.
The reboiler of the tower kettle is in a horizontal tube falling film type.
The second rectifying tower compressor, the fifth rectifying tower compressor, the sixth rectifying tower compressor and the twelfth rectifying tower compressor are all double-screw compressors.
The second rectifying tower, the fifth rectifying tower, the sixth rectifying tower and the twelfth rectifying tower are respectively provided with a reflux tank, a liquid outlet is arranged on the reflux tank, the liquid outlet of the reflux tank of the second rectifying tower is connected with a second spray pump, and the outlet of the second spray pump is connected with the outlet of a compressor of the second rectifying tower; a liquid outlet of a reflux tank of the fifth rectifying tower is connected with a fifth spray pump, and an outlet of the fifth spray pump is connected with an outlet of a compressor of the fifth rectifying tower; a liquid outlet of a reflux tank of the sixth rectifying tower is connected with a sixth spray pump, and an outlet of the sixth spray pump is connected with an outlet of a compressor of the sixth rectifying tower; and a liquid outlet of a reflux tank of the twelfth rectifying tower is connected with a twelfth spray pump, an outlet of the twelfth spray pump is connected with an outlet of a compressor of the twelfth rectifying tower, and the spray is arranged for eliminating superheated steam.
The working method of the utility model is as follows: 67600kg/h of waste liquid from the previous section comprises 1.13% of water, 68.97% of methanol, 29.39% of methyl acetate, 0.37% of sodium acetate and 0.14% of acetaldehyde, the waste liquid is fed from a first rectifying tower, methanol is purified by rectification, the pressure at the tower top is 3kPa, 41461kg/h of obtained tower bottom liquid comprises 97.34% of methanol, 1.84% of water and 0.82% of sodium acetate, the waste liquid enters a fourth rectifying tower, the pressure at the tower top of the fourth rectifying tower is 45kPa, 20000kg/h of 99.8% of methanol is extracted from the tower top and is used for a polymerization process, the extracted liquid at the tower bottom of the fourth rectifying tower is 25139kg/h of water containing 2.5%, 96.15% of methanol and 1.35% of sodium acetate, and is sent to a third rectifying tower for continuous rectification.
75000kg/h of tower top produced liquid of the first rectifying tower, 99.8 percent of methanol and 0.2 percent of water enter the second rectifying tower, meanwhile, 14000kg/h of water is added into 8 percent of the tower top steam 27249kg/h containing 92 percent of methyl acetate from the operating pressure of the second rectifying tower being 2kPa, the methyl acetate is hydrolyzed and then enters the twelfth rectifying tower, the operating pressure is 1kPa, the tower top produced liquid of the twelfth rectifying tower consists of 90 percent of methyl acetate, 6 percent of water and 4 percent of methanol, one part of the water enters the eleventh rectifying tower to remove acetaldehyde, the other part of the water enters the thirteenth rectifying tower, 9231kg/h of hydrolysis product water and 8477kg/h of methanol are obtained at the tower bottom, 5895kg/h of acetic acid and 7645kg/h of methyl acetate, rectifying tower bottom liquid of a twelfth rectifying tower in a fifth rectifying tower, wherein the tower top pressure is 30kPa, the tower bottom produced liquid of the second rectifying tower consists of 70 percent of water, and 30 percent of methanol accounts for 31950kg/h, the tower bottom produced liquid enters a third rectifying tower, one part of feed of the third rectifying tower is from the tower bottom produced liquid of the second rectifying tower, the other part of feed of the third rectifying tower is from 35 percent of the tower bottom produced liquid of a polymerization second tower (in the previous working section), the tower top pressure of the third rectifying tower is 130kPa, after the produced liquid is subjected to heat exchange and temperature reduction, one part of the produced liquid returns to a tank area, and the part of the produced liquid enters a fourth rectifying tower for rectification, and the operation pressure is 45kPa.
The tower top pressure of the fifth rectifying tower is 30kPa, 28900kg/h of tower bottom produced liquid consists of 45 percent of water and 55 percent of acetic acid, the produced liquid enters a sixth rectifying tower for azeotropic distillation, the operating pressure is 2.6kPa, and 99.5 percent of acetic acid 15895kg/h is separated from the tower bottom of the sixth rectifying tower. The n-butyl acetate is an entrainer and forms an azeotrope with water, the gas phase at the top of the tower is divided into an upper ester phase and a lower water phase after entering a condenser, wherein the total amount of the ester phase and the lower water phase is 39100kg/h, and 13005kg/h of the water phase enters a seventh rectifying tower for continuous rectification.
The second rectifying tower, the fifth rectifying tower, the sixth rectifying tower and the twelfth rectifying tower are provided with self-backheating systems, and the outlet pressures of the compressors are respectively as follows: 350kPa,730 kPa,400 kPa and 260 kPa, the pressure ratios being: 3.4,5.6,4.0 and 2.6. Pressurizing and heating the tower top steam through a compressor and then taking the tower top steam as a heat source of a tower kettle reboiler, wherein the tower top heat of the second rectifying tower is more, compressing part of the tower top steam to meet the heat requirement of the tower kettle group, and condensing and refluxing the rest part of the tower top steam through a tower top condenser; the heat of the steam at the top of the fifth rectifying tower and the sixth rectifying tower is not enough to meet the heat load requirement of the tower kettle, and raw steam needs to be supplemented in a fifth rectifying tower supplement reboiler 5-4 and a sixth rectifying tower supplement reboiler 6-5 respectively to meet the heat load requirement of the corresponding tower kettle.
The heat of the steam at the top of the rectifying tower is recycled, so that the consumption of the steam generated by the whole device is greatly reduced, and the energy-saving effect is very obvious.
Comparison with the operating costs of example 1: (according to the specific situation of the location of the device, the steam price is 200 yuan/ton, and the electricity price is 0.7 yuan/degree and the operation is carried out according to 8000 hours all the year)
Through calculating, adopt the utility model discloses a polyvinyl alcohol rectifier unit compares 46t live steam of saving every hour with prior art, can practice thrift 37 ten thousand tons live steam all the year, practices thrift RMB 4699 ten thousand yuan, the utility model discloses in utilize clean low-priced electric energy to promote the heat energy of the low grade in top of the tower for high-grade heat energy heats the tower cauldron, practiced thrift a large amount of live steam. The method meets the requirement of environmental protection, and is energy-saving and safe.
The invention has been described above by way of example, and it should be noted that any simple variants, modifications or other equivalent substitutions by a person skilled in the art without spending creative effort may fall within the scope of protection of the present invention without departing from the core of the present invention.
Claims (5)
1. The utility model provides an energy-conserving polyvinyl alcohol rectifier unit, includes first rectifying column, second rectifying column, third rectifying column, fourth rectifying column, fifth rectifying column, sixth rectifying column, seventh rectifying column, eighth rectifying column, eleventh rectifying column and twelfth rectifying column, and above-mentioned rectifying column all is equipped with the feed inlet, and export is adopted to the top of the tower steam, and the backward flow mouth, export is adopted to the top of the tower cauldron, top of the tower condenser and tower cauldron reboiler, its characterized in that includes original rectifying system and from the backheat system, original rectifying system includes: the top of the first rectifying tower is connected with the feed inlet of the second rectifying tower, the bottom of the first rectifying tower is connected with the feed inlet of the fourth rectifying tower,
a first preheater is arranged on a feed pipeline of the first rectifying tower, a second preheater is arranged between a tower kettle extraction port of the first rectifying tower and a feed inlet of the fourth rectifying tower,
a tower bottom extraction outlet of the second rectifying tower is connected with a feed inlet of the third rectifying tower, a tower top extraction outlet of the second rectifying tower is connected with a feed inlet of the twelfth rectifying tower,
the top of the third rectifying tower is provided with an outlet which is respectively connected with a heat source inlet of the first feed preheater and a heat source inlet of the second feed preheater, a heat source outlet of the first feed preheater is connected with a tank area recycling port, a heat source outlet of the second preheater is connected with a feed port of the fourth rectifying tower,
a tower kettle extraction outlet of the fourth rectifying tower is connected with a feed inlet of the third rectifying tower,
the feed inlet of the fifth rectifying tower is connected with the tower bottom extraction outlet of the twelfth rectifying tower, the tower bottom extraction outlet of the fifth rectifying tower is connected with the feed inlet of the sixth rectifying tower, the tower top extraction outlet of the fifth rectifying tower is connected with the feed inlet of the second rectifying tower,
the top extraction outlet of the sixth rectifying tower is connected with the feed inlet of the seventh rectifying tower, the top extraction outlet of the seventh rectifying tower is connected with the feed inlet of the eighth rectifying tower,
a tower top extraction outlet of the twelfth rectifying tower is connected with a feed inlet of the eleventh rectifying tower, and a tower kettle extraction outlet of the eleventh rectifying tower is connected with a feed inlet of the second rectifying tower;
the self-regenerative system comprises:
the tower top steam outlet of the second rectifying tower is connected with the heat source inlet of the tower top condenser of the second rectifying tower, the heat source outlet of the tower top condenser of the second rectifying tower is connected with the reflux port of the second rectifying tower, the tower top steam outlet of the second rectifying tower is also connected with a second rectifying tower compressor, the outlet of the second rectifying tower compressor is connected with the heat source inlet of a tower kettle reboiler of the second rectifying tower, the heat source outlet of the tower kettle reboiler of the second rectifying tower is connected with the heat source inlet of a cooler of the second rectifying tower, and the heat source outlet of the cooler of the second rectifying tower is connected with the reflux port of the second rectifying tower;
the tower top steam outlet of the fifth rectifying tower is connected with a fifth rectifying tower compressor, the outlet of the fifth rectifying tower compressor is connected with the heat source inlet of a reboiler of the tower kettle of the fifth rectifying tower, the heat source outlet of the reboiler of the tower kettle of the fifth rectifying tower is connected with the heat source inlet of a cooler of the fifth rectifying tower, and the heat source outlet of the cooler of the fifth rectifying tower is connected with the reflux port of the fifth rectifying tower;
the tower top steam outlet of the sixth rectifying tower is connected with a sixth rectifying tower compressor, the outlet of the sixth rectifying tower compressor is connected with the heat source inlet of a reboiler of the tower kettle of the sixth rectifying tower, the heat source outlet of the reboiler of the tower kettle of the sixth rectifying tower is connected with the heat source inlet of a cooler of the sixth rectifying tower, and the heat source outlet of the cooler of the sixth rectifying tower is connected with the reflux port of the sixth rectifying tower;
the tower top steam outlet of the twelfth rectifying tower is connected with a compressor of the twelfth rectifying tower, the outlet of the compressor of the twelfth rectifying tower is connected with the heat source inlet of a reboiler of the tower kettle of the twelfth rectifying tower, the heat source outlet of the reboiler of the tower kettle of the twelfth rectifying tower is connected with the heat source inlet of a cooler of the twelfth rectifying tower, and the heat source outlet of the cooler of the twelfth rectifying tower is connected with the reflux port of the twelfth rectifying tower.
2. The energy-saving polyvinyl alcohol rectification device according to claim 1, wherein the tower reboiler is in a horizontal tube falling film type.
3. The energy-saving polyvinyl alcohol rectification device according to claim 1, wherein the second, fifth, sixth and twelfth rectification tower compressors are twin-screw compressors, centrifugal compressors or roots compressors.
4. The energy-saving polyvinyl alcohol rectification device according to claim 1, wherein the second rectification tower, the fifth rectification tower, the sixth rectification tower and the twelfth rectification tower are respectively provided with a reflux tank, each reflux tank is provided with a liquid outlet, the liquid outlet of the reflux tank of the second rectification tower is connected with a second spray pump, the outlet of the second spray pump is connected with the outlet of the compressor of the second rectification tower,
a liquid outlet of a reflux tank of the fifth rectifying tower is connected with a fifth spray pump, an outlet of the fifth spray pump is connected with an outlet of a compressor of the fifth rectifying tower,
a liquid outlet of a reflux tank of the sixth rectifying tower is connected with a sixth spray pump, an outlet of the sixth spray pump is connected with an outlet of a compressor of the sixth rectifying tower,
and a liquid outlet of a reflux tank of the twelfth rectifying tower is connected with a twelfth spray pump, and an outlet of the twelfth spray pump is connected with an outlet of the compressor of the twelfth rectifying tower and used for eliminating superheated steam.
5. The energy-saving polyvinyl alcohol rectification device according to claim 1, wherein the fifth rectification column is provided with a fifth supplementary reboiler, and the sixth rectification column is provided with a sixth supplementary reboiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222478098.4U CN217612999U (en) | 2022-09-20 | 2022-09-20 | Energy-saving polyvinyl alcohol rectifying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222478098.4U CN217612999U (en) | 2022-09-20 | 2022-09-20 | Energy-saving polyvinyl alcohol rectifying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217612999U true CN217612999U (en) | 2022-10-21 |
Family
ID=83636761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222478098.4U Active CN217612999U (en) | 2022-09-20 | 2022-09-20 | Energy-saving polyvinyl alcohol rectifying device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217612999U (en) |
-
2022
- 2022-09-20 CN CN202222478098.4U patent/CN217612999U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100453137C (en) | Alcohol quinque-towel differential pressure distilling arrangement and technique thereof | |
| CN101153257B (en) | Five-tower two-grade difference pressure distillation equipment for senior edible ethanol and technique thereof | |
| CN101580457A (en) | Device and process for preparing absolute ethyl alcohol by taking fermented liquor as the raw material | |
| CN102643195B (en) | Production method of n-butyl acetate | |
| CN105037094A (en) | Energy coupling distillation method for preparing ethyl alcohol by means of acetic acid ester hydrogenation | |
| CN111437619A (en) | Multi-tower differential pressure energy-saving anhydrous alcohol distillation system and anhydrous alcohol energy-saving production method | |
| CN103113614B (en) | PVA (Polyvinyl Alcohol) Energy-Saving and Consumption-Reducing Production New Technology Method | |
| CN116116030A (en) | Energy-saving and emission-reducing system for chemical separation and purification process | |
| CN104083888A (en) | Process method for producing octanol through vacuum rectification | |
| CN217612999U (en) | Energy-saving polyvinyl alcohol rectifying device | |
| CN104844414A (en) | Equipment and process for recovering glyphosate solvent during production with glycine method | |
| CN216777948U (en) | Intermittent purification device for propylene glycol methyl ether | |
| CN210021208U (en) | Distillation energy-saving system for preparing ethanol from carbon monoxide | |
| CN112409181A (en) | Dimethyl oxalate rectifying device for coal chemical industry | |
| CN107162909A (en) | A kind of vinyl acetate refined thermal coupling methods and device | |
| CN101486641A (en) | Industrialized production method of ethyl acetate and production apparatus thereof | |
| CN210314061U (en) | Rectification and purification device for synthesizing dimethyl oxalate by carbonylation of coal-made ethylene glycol | |
| CN202336224U (en) | Azeotropic distillation system for mixture of carbinol and tetrahydrofuran | |
| CN106693429A (en) | Treatment system and method for ethyl acetate production water | |
| CN214032309U (en) | Dimethyl oxalate rectifying device for coal chemical industry | |
| CN206843352U (en) | A kind of 1,4 butynediols purification systems | |
| CN208865211U (en) | Energy-saving methanol circulating separation and purification equipment | |
| CN110975316A (en) | THF (tetrahydrofuran) rectifying device for PBT (polybutylene terephthalate) production | |
| CN110124583A (en) | It is a kind of applied to continuous production or isolated vaporization reactor | |
| CN108314622A (en) | A kind of new acetic acid ethyl ester extracting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |