CN109133232A - A kind of recovery system and its recovery method of highly concentrated formaldehyde solution - Google Patents
A kind of recovery system and its recovery method of highly concentrated formaldehyde solution Download PDFInfo
- Publication number
- CN109133232A CN109133232A CN201811128117.2A CN201811128117A CN109133232A CN 109133232 A CN109133232 A CN 109133232A CN 201811128117 A CN201811128117 A CN 201811128117A CN 109133232 A CN109133232 A CN 109133232A
- Authority
- CN
- China
- Prior art keywords
- tower
- backflash
- formaldehyde
- pressurizing
- preheater
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/78—Separation; Purification; Stabilisation; Use of additives
- C07C45/81—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a kind of recovery system of highly concentrated formaldehyde solution and its recovery methods, recovery system includes dilute formaldehyde storage tank, preheater, pressurizing tower, the first reboiler, the first backflash, vacuum tower, the second reboiler, the second backflash, finished product collecting tank, using " add-depressurize " process, low formalin is concentrated, content of formaldehyde is improved, the concentration formalin of high concentration is obtained.The present invention has the advantages that the formalin (HCHO content 60%) being concentrated from low concentration formaldehyde waste water, it realizes and recycles, and make the content of formaldehyde in waste discharge lower than 500ppm, biochemical treatment standard can be reached, the tower reactor extraction material for feeding waste water and heat is separately subjected to heat exchange, it realizes the integrated of energy, the consumption of heating steam and refrigerant can be reduced, improve the economic operation level of system.
Description
Technical field
The present invention relates to organic wastewater recovery process technical fields, and in particular to a kind of recycling system of highly concentrated formaldehyde solution
System and its recovery method.
Background technique
Formaldehyde (HCHO) is a kind of important industrial chemicals, in fine chemistry industries and other industrial circles such as agriculture medicine ﹑ pharmacy, especially
It is pesticide and its intermediate synthesis field play the role of it is very important.Since formaldehyde only just has height in aqueous solution
Reactivity, therefore inevitably generate in the production process of pesticide waste water largely containing low concentration formaldehyde.Due to first
Aldehyde can kill microorganism, therefore these waste water are difficult to be handled with traditional biochemical method.And the wastewater flow rate containing formaldehyde is big, directly
Discharge does not meet environmental requirement not only, but also causes the waste of resource, has violated clean and environmental protection production and Circular Economic Thought.
Summary of the invention
It is an object of the invention to aiming at the shortcomings in the prior art, provide a kind of recovery system of highly concentrated formaldehyde solution
And its recovery method.
To achieve the goals above, the technical solution adopted in the present invention is as follows:
A kind of recovery system of highly concentrated formaldehyde solution, including dilute formaldehyde storage tank, preheater, pressurizing tower, the first reboiler,
First backflash, vacuum tower, the second reboiler, the second backflash, finished product collecting tank, the output end of dilute formaldehyde storage tank and institute
Preheater is stated to be connected, the preheater and pressurizing tower forming circuit connect, the bottom of the pressurizing tower also with described first again
Boiling device is connected and is formed into a loop, and the tower top of the pressurizer is connect with the top of first backflash, the pressurizer
The first condenser is equipped between tower top and first backflash, the bottom of first backflash and the pressurizing tower are close to tower
It is connected below top, is formed into a loop, the bottom of first backflash is also connected with the vacuum tower, the decompression column overhead
It is connected with second backflash, the second condenser is additionally provided between the decompression column overhead and second backflash, it is described
The bottom of second backflash is connected and is formed into a loop below tower top with the vacuum tower, the bottom of second backflash
Portion is also connected with the input terminal of dilute formaldehyde storage tank, and the bottom side of the pressurizing tower is connected with second reboiler
And be formed into a loop, the bottom other side of the pressurizing tower is connected with the finished product collecting tank.
Further, one end of the preheater is also connected with wastewater trough.
Further, between the output end and the preheater for stating dilute formaldehyde storage tank, the bottom of first backflash
Portion and the pressurizing tower between the lower section of tower top, the bottom of first backflash also between the vacuum tower, it is described
The bottom of second backflash and the vacuum tower are between the lower section of tower top, the bottom of second backflash and dilute first
Rear pump is equipped between the input terminal of aldehyde storage tank.
Further, the preheater is connected to the middle and upper part of pressurizing tower.
Further, the bottom of first backflash is connected with the middle and lower part of the vacuum tower.
Preferably, first reboiler is vertical thermosiphon reboiler, and heat medium is 0.6MPa saturated vapor.
Preferably, second reboiler is kettle type reboiler, and heat medium is 0.6MPa saturated vapor.
Preferably, the pressurizing tower and the device type of vacuum tower are plate column or regular packed tower.
The method that the present invention recycles highly concentrated formaldehyde solution, includes the following steps:
S1, the waste water containing formaldehyde in dilute formaldehyde storage tank is pumped into the preheater heating, into the pressurizing tower
Top, tower top pressure are 0.25~0.3MPa, and tower top temperature is 135~140 DEG C, and bottom temperature is 142~145 DEG C, and tower top is adopted
Object enters first backflash after first condenser is cooling out, and the waste water of tower reactor adds by first reboiler
Pressurizing tower is flowed back into after heat again, and with after the wastewater heat exchange that the preheater enters the pressurizing tower, passes through the pressurizing tower
Bottom discharge, and the wastewater trough is entered by the preheater；
S2, the acquisition object in first backflash is pumped into the middle and lower part of the vacuum tower, while being connect with tower reactor
Second reboiler will acquire object heating, the vacuum tower tower top pressure be -0.07~-0.08MPa, tower top temperature be 60~
70 DEG C, bottom temperature is 75~80 DEG C, and the vacuum tower overhead extraction object enters described after second condenser is cooling
Second backflash, then it is pumped into dilute formaldehyde storage tank.
Beneficial effects of the present invention:
1, this technique is handled low concentration formaldehyde waste water with the method for pressurization-depressurization rectifying, the formaldehyde being concentrated
Solution (HCHO content 60%), which is realized, to be recycled, and makes the content of formaldehyde in waste discharge lower than 500ppm, can be reached raw
Change processing standard.
2. other traditional recovery process, charging need to be first preheated rear into pressurizing tower, need to consume a large amount of steam；Formaldehyde warp
After pressurizing tower concentrate, the high-temperature material of pressurizing tower tower reactor needs first to be discharged after cooler is cooling, need to consume a large amount of cooling water.This
The tower reactor extraction material for feeding waste water and heat is carried out heat exchange by invention, realizes the integrated of energy, can reduce heating steam and cold
The consumption of matchmaker improves the economic operation level of device.
3. decompression column overhead is low concentration formaldehyde solution, it is back to pressurizing tower charging, the circulation of formaldehyde is realized, reaches circulation
Economic purpose.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of the recovery system of highly concentrated formaldehyde solution of the invention.
In figure: the dilute formaldehyde storage tank of 1-, 2- preheater, 3- pressurizing tower, the first condenser of 4-, the first backflash of 5-, 6- first
Reboiler, 7- vacuum tower, the second condenser of 8-, the second backflash of 9-, the second reboiler of 10-, 11- product collecting tank, 12- waste water
Slot.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig.1, a kind of recovery system of highly concentrated formaldehyde solution is present embodiments provided, including dilute formaldehyde storage tank 1, pre-
Hot device 2, pressurizing tower 3, the first reboiler 6, the first backflash 5, vacuum tower 7, the second reboiler 10, the second backflash 9, finished product are received
Collect slot 11, the output end of dilute formaldehyde storage tank 1 is connected with preheater 2, and one end of preheater 2 is also connected with wastewater trough 12
Logical, preheater 2 and the forming circuit of pressurizing tower 3 connect, and preheater 2 is connected to the middle and upper part of pressurizing tower 3, and the bottom of pressurizing tower 3 is also
It is connected and is formed into a loop with the first reboiler 6, the first reboiler 6 is vertical thermosiphon reboiler, and heat medium is
0.6MPa saturated vapor, the tower top of pressurizer 3 are connect with the top of the first backflash 5, the tower top of pressurizer 3 and the first reflux
The first condenser 4 is equipped between slot 5, the bottom of the first backflash 5 is connected below tower top with pressurizing tower 3, is formed back
The bottom on road, the first backflash 5 is also connected with the middle and lower part of vacuum tower 7, and 7 tower top of vacuum tower is connected with the second backflash 9, subtracts
The second condenser 8 is additionally provided between pressure 7 tower top of tower and the second backflash 9, the bottom of the second backflash 9 and vacuum tower 7 are close to tower
It is connected below top and is formed into a loop, the bottom of the second backflash 9 is also connected with the input terminal of dilute formaldehyde storage tank 1, decompression
The bottom side of tower 7 is connected and is formed into a loop with the second reboiler 10, and the second reboiler 10 is kettle type reboiler, heat medium
For 0.6MPa saturated vapor, the bottom other side of vacuum tower 7 is connected with 11 finished product collecting tanks, pressurizing tower 3 and vacuum tower 7
Device type is plate column or regular packed tower.
Between the output end and preheater 2 of dilute formaldehyde storage tank 1, the bottom of the first backflash 5 and pressurizing tower 3 be close to tower top
Between lower section, the bottom of the first backflash 5 also between vacuum tower 7, the bottom of the second backflash 9 and vacuum tower 7 be close to tower top
Lower section between, between the bottom of the second backflash 9 and the input terminal of dilute formaldehyde storage tank 1 be equipped with rear pump.
The method that the present invention recycles highly concentrated formaldehyde solution, includes the following steps:
S1, the waste water containing formaldehyde in dilute formaldehyde storage tank is pumped into preheater heating, into pressurizing tower middle and upper part, tower top pressure
For 0.25~0.3MPa, tower top temperature is 135~140 DEG C, and bottom temperature is 142~145 DEG C, and overhead extraction object is cold by first
Entering first backflash after condenser is cooling, the waste water of tower reactor flows back into pressurizing tower after the heating of the first reboiler again, and
With after the wastewater heat exchange that preheater enters the pressurizing tower, it is discharged by the bottom of pressurizing tower, and entered by preheater
Wastewater trough；
S2, the middle and lower part that the acquisition object in the first backflash is pumped into vacuum tower, while second connect with tower reactor is boiled again
Device will acquire object heating, and vacuum tower tower top pressure is -0.07~-0.08MPa, and tower top temperature is 60~70 DEG C, and bottom temperature is
75~80 DEG C, vacuum tower overhead extraction object enters the second backflash after the second condenser is cooling, then is pumped into dilute formaldehyde storage tank.
In the present invention: 1. techniques are handled low concentration formaldehyde waste water with the method for pressurization-depressurization rectifying, are obtained dense
The formalin (HCHO content 60%) of contracting, which is realized, to be recycled, and makes the content of formaldehyde in waste discharge lower than 500ppm, energy
Enough reach biochemical treatment standard.
2. other traditional recovery process, charging need to be first preheated rear into pressurizing tower, need to consume a large amount of steam；Formaldehyde warp
After pressurizing tower concentrate, the high-temperature material of pressurizing tower tower reactor needs first to be discharged after cooler is cooling, need to consume a large amount of cooling water.This
The tower reactor extraction material for feeding waste water and heat is carried out heat exchange by invention, realizes the integrated of energy, can reduce heating steam and cold
The consumption of matchmaker improves the economic operation level of device.
3. decompression column overhead is low concentration formaldehyde solution, it is back to pressurizing tower charging, the circulation of formaldehyde is realized, reaches circulation
Economic purpose.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (9)
1. a kind of recovery system of highly concentrated formaldehyde solution, which is characterized in that including dilute formaldehyde storage tank, preheater, pressurizing tower,
One reboiler, the first backflash, vacuum tower, the second reboiler, the second backflash, finished product collecting tank, dilute formaldehyde storage tank
Output end is connected with the preheater, the preheater and pressurizing tower forming circuit connect, the bottom of the pressurizing tower also with
First reboiler is connected and is formed into a loop, and the tower top of the pressurizer is connect with the top of first backflash, institute
It states and is equipped with the first condenser between the tower top of pressurizer and first backflash, the bottom of first backflash adds with described
Pressure tower is connected below tower top, is formed into a loop, the bottom of first backflash is also connected with the vacuum tower, described
Decompression column overhead is connected with second backflash, and it is cold to be additionally provided with second between the decompression column overhead and second backflash
The bottom of condenser, second backflash is connected and is formed into a loop below tower top with the vacuum tower, and described second
The bottom of backflash is also connected with the input terminal of dilute formaldehyde storage tank, and the bottom side of the pressurizing tower and described second is again
Boiling device is connected and is formed into a loop, and the bottom other side of the pressurizing tower is connected with the finished product collecting tank.
2. a kind of recovery system of highly concentrated formaldehyde solution according to claim 1, which is characterized in that the preheater
One end is also connected with wastewater trough.
3. a kind of recovery system of highly concentrated formaldehyde solution according to claim 1, which is characterized in that dilute formaldehyde storage
Between the output end of slot and the preheater, the bottom of first backflash and the pressurizing tower close to the lower section of tower top it
Between, the bottom of first backflash also between the vacuum tower, the bottom of second backflash leans on the vacuum tower
Output is equipped between the lower section of nearly tower top, between the bottom of second backflash and the input terminal of dilute formaldehyde storage tank
Pump.
4. a kind of recovery system of highly concentrated formaldehyde solution according to claim 1, which is characterized in that the preheater with
The middle and upper part of pressurizing tower is connected to.
5. a kind of recovery system of highly concentrated formaldehyde solution according to claim 1, which is characterized in that first reflux
The bottom of slot is connected with the middle and lower part of the vacuum tower.
6. a kind of recovery system of highly concentrated formaldehyde solution according to claim 1, which is characterized in that described first boils again
Device is vertical thermosiphon reboiler, and heat medium is 0.6MPa saturated vapor.
7. a kind of recovery system of highly concentrated formaldehyde solution according to claim 1, which is characterized in that described second boils again
Device is kettle type reboiler, and heat medium is 0.6MPa saturated vapor.
8. a kind of recovery system of highly concentrated formaldehyde solution according to claim 1, which is characterized in that the pressurizing tower
Device type with vacuum tower is plate column or regular packed tower.
9. it is a kind of using recovery system described in any one of claim 1-8 claim carry out recycling high-concentration formaldehyde it is molten
The method of liquid, which comprises the steps of:
S1, it the waste water containing formaldehyde in dilute formaldehyde storage tank is pumped into the preheater heats, into the pressurizing tower middle and upper part,
Tower top pressure is 0.25~0.3MPa, and tower top temperature is 135~140 DEG C, and bottom temperature is 142~145 DEG C, overhead extraction object warp
Cross first condenser it is cooling after enter first backflash, the waste water of tower reactor after first reboiler heating again
Pressurizing tower is flowed back into, and with after the wastewater heat exchange that the preheater enters the pressurizing tower, passes through the bottom of the pressurizing tower
Discharge, and the wastewater trough is entered by the preheater；
S2, the middle and lower part that the acquisition object in first backflash is pumped into the vacuum tower, while described in connecting with tower reactor
Second reboiler will acquire object heating, and the vacuum tower tower top pressure is -0.07~-0.08MPa, and tower top temperature is 60~70
DEG C, bottom temperature is 75~80 DEG C, and the vacuum tower overhead extraction object enters described the after second condenser is cooling
Two backflashes, then it is pumped into dilute formaldehyde storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811128117.2A CN109133232A (en) | 2018-09-27 | 2018-09-27 | A kind of recovery system and its recovery method of highly concentrated formaldehyde solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811128117.2A CN109133232A (en) | 2018-09-27 | 2018-09-27 | A kind of recovery system and its recovery method of highly concentrated formaldehyde solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109133232A true CN109133232A (en) | 2019-01-04 |
Family
ID=64812634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811128117.2A Pending CN109133232A (en) | 2018-09-27 | 2018-09-27 | A kind of recovery system and its recovery method of highly concentrated formaldehyde solution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109133232A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114790061A (en) * | 2022-04-25 | 2022-07-26 | 天津渤化永利化工股份有限公司 | Method for reducing formic acid in formaldehyde recovery system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007254484A (en) * | 1998-06-05 | 2007-10-04 | Lucite Internatl Uk Ltd | Dewatering process |
| CN108276249A (en) * | 2018-04-04 | 2018-07-13 | 烟台国邦化工机械科技有限公司 | A kind of high concentration ethanol double-effect rectification process and system |
-
2018
- 2018-09-27 CN CN201811128117.2A patent/CN109133232A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007254484A (en) * | 1998-06-05 | 2007-10-04 | Lucite Internatl Uk Ltd | Dewatering process |
| CN108276249A (en) * | 2018-04-04 | 2018-07-13 | 烟台国邦化工机械科技有限公司 | A kind of high concentration ethanol double-effect rectification process and system |
Non-Patent Citations (4)
| Title |
|---|
| 中国科学院吉林应用化学研究所: "《聚甲醛》", 30 April 1973 * |
| 朱明媚等: "《化工原理》", 31 January 2017 * |
| 路甬祥: "《现代科学技术大众百科 技术卷》", 30 June 2001 * |
| 陈同芸等: "甲醛水溶液的加压精馏分离", 《化学世界》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114790061A (en) * | 2022-04-25 | 2022-07-26 | 天津渤化永利化工股份有限公司 | Method for reducing formic acid in formaldehyde recovery system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105418447A (en) | DMAC (dimethylacetamide) rectification device and technique | |
| CN104926675A (en) | Recovery process of low concentration dimethylacetamide | |
| CN106334327B (en) | A kind of alcohol distillation production method | |
| CN104817481A (en) | Technological method for recovering DMSO from DMSO aqueous solution | |
| CN204034286U (en) | Board-like mechanical vapour recompression evaporator | |
| CN109336803A (en) | A kind of method and its system of NMP devil liquor recovery production super-clean high-purity solvent | |
| CN110436545A (en) | A kind of remained ammonia distilling apparatus of heat energy recycling | |
| CN109133232A (en) | A kind of recovery system and its recovery method of highly concentrated formaldehyde solution | |
| CN103466658B (en) | Sodium cyanide evaporation and concentration device and method | |
| CN207980445U (en) | Alcohol extracting liquid evaporates and ethyl alcohol rectification coupling apparatus | |
| CN107792904A (en) | A kind of technique and device of continuous removal of ammonia and nitrogen light component organic matter and salt | |
| CN108421274A (en) | The double thick double smart eight column distillation device and method of low-pressure process for producing top grade alcohol | |
| CN104926609B (en) | The method of neopentyl glycol mother solution and technological process thereof in a kind for the treatment of cloth ibuprofen synthesis procedure | |
| CN106431884B (en) | A kind of butyraldehyde oxidation prepares the device and method of butyric acid | |
| CN107827778B (en) | Device and process for refining cyanoacetic acid ester by continuous rectification | |
| CN106809896B (en) | A kind of organic wastewater treating system and method | |
| CN105314655B (en) | Method and device for utilizing brine geothermal energy and condensed water heat energy | |
| CN207537373U (en) | A kind of continuous rectification refines cyanoacetate compound device | |
| CN212532809U (en) | Pre-concentration device of urea low-pressure system | |
| CN105669380B (en) | The ethylene glycol recyclable device and ethylene glycol recovery method of polyester waste water recovery system | |
| CN210813998U (en) | Rectification separation system | |
| CN205340191U (en) | Rectification condensing equipment of ethanol recovery purification | |
| CN212417027U (en) | Novel high-efficient triple-effect evaporator | |
| CN104829452B (en) | Energy-saving production system of ethyl acetate and corresponding energy-saving production technology | |
| CN207451656U (en) | A kind of continuous removal of ammonia and nitrogen light component organic matter and salt system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190104 |
|
| RJ01 | Rejection of invention patent application after publication |