CN213652344U - Utilize production system of 50% formaldehyde production paraformaldehyde - Google Patents
Utilize production system of 50% formaldehyde production paraformaldehyde Download PDFInfo
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- CN213652344U CN213652344U CN202022393086.2U CN202022393086U CN213652344U CN 213652344 U CN213652344 U CN 213652344U CN 202022393086 U CN202022393086 U CN 202022393086U CN 213652344 U CN213652344 U CN 213652344U
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Abstract
The utility model discloses a production system for producing paraformaldehyde by using 50% formaldehyde, 50% formaldehyde enters from the bottom of a heating chamber of a climbing film evaporator, enters a concentrated aldehyde separator of the climbing film evaporator after vaporization, a concentrated aldehyde extraction pipeline is arranged at the bottom end of the concentrated aldehyde separator and is connected with a concentrated aldehyde receiving tank, concentrated aldehyde in the concentrated aldehyde receiving tank is connected with a concentrated aldehyde tank through a concentrated aldehyde extraction pump, concentrated aldehyde in the concentrated aldehyde tank is sent to a target dryer through a rake drying feeding pump, a top gas outlet of the concentrated aldehyde separator is connected with a bottom gas inlet of a dilute aldehyde absorption tower, an outlet pipeline of the dilute aldehyde condenser is connected with an absorption liquid spray pipe, a top steam pipeline of the dilute aldehyde absorption tower is connected with a top condenser of the dilute aldehyde absorption tower, an outlet pipeline of the dilute aldehyde top condenser is connected with a liquid separation pipe, a bottom liquid outlet pipeline of the liquid separation pipe is connected with a lower liquid return pipe of the dilute aldehyde absorption tower, an upper gas outlet pipeline of the liquid separation pipe is connected with a dilute aldehyde vacuum, the outlet pipeline of the dilute aldehyde vacuum pump is connected with the vacuum water tank. And the emission is reduced.
Description
Technical Field
The utility model relates to an utilize production system of 50% formaldehyde production paraformaldehyde belongs to paraformaldehyde production field.
Background
Paraformaldehyde is a general-purpose thermoplastic engineering plastic, has excellent mechanical performance, electrical performance, wear resistance, dimensional stability, chemical corrosion resistance, especially outstanding strain resistance and good self-lubricating performance, is an ideal engineering plastic for replacing metals, especially nonferrous metals such as copper, aluminum, zinc and the like and alloy products, and is widely applied to the fields of electronics and electricity, automobiles, light industry, machinery, chemical industry, building materials and the like. The paraformaldehyde has the characteristics of high purity, good water solubility, complete depolymerization, loose product, uniform particles and the like. The problems of high packaging requirement, poor storage stability, inconvenient transportation and the like of the industrial formaldehyde are well solved, and the industrial formaldehyde aqueous solution is replaced. The application of the formaldehyde-free composite material in synthesizing pesticides, synthetic resins, coatings, preparing fumigation disinfectants and other various downstream formaldehyde products can reduce the energy consumption of dehydration and greatly reduce the wastewater treatment capacity.
The paraformaldehyde is generated by self-condensation reaction when the formaldehyde solution is evaporated and concentrated to 60-70%, and the reaction equation is as follows:
the current process flow is as follows:
concentrating 37% formaldehyde solution to 60% by a scraper evaporator, automatically flowing into a receiving kettle, continuously heating and evaporating in the kettle, dewatering until the concentration reaches about 70%, adding caustic soda flakes into a target dryer for further dewatering to finally obtain a paraformaldehyde product, discharging the product from a discharge port of the target dryer, cooling, crushing, bagging and warehousing. And (4) discharging the product from a discharge port of the target dryer, cooling, crushing, bagging and warehousing. In the whole process, how to fully absorb the formaldehyde tail gas and avoid tail gas emission becomes a problem to be solved.
SUMMERY OF THE UTILITY MODEL
To the technical problem, an object of the utility model is to provide an utilize 50% formaldehyde production paraformaldehyde's production system, can make full use of formaldehyde tail gas.
In order to realize the purpose, the technical scheme of the utility model is that: a production system for producing paraformaldehyde by using 50% formaldehyde comprises a climbing film evaporator and is characterized in that: 50% of formaldehyde enters from the bottom of a heating chamber of the climbing film evaporator, and enters a concentrated aldehyde separator of the climbing film evaporator after being vaporized, wherein the top end, the upper part and the lower part of the concentrated aldehyde separator are respectively provided with a steam heating pipeline, the bottom end of the concentrated aldehyde separator is provided with a concentrated aldehyde extraction pipeline connected with a concentrated aldehyde receiving tank, concentrated aldehyde in the concentrated aldehyde receiving tank is connected with a concentrated aldehyde tank through a concentrated aldehyde extraction pump, concentrated aldehyde in the concentrated aldehyde tank is conveyed to a target dryer through a rake drying feeding pump, a gas outlet at the top of the concentrated aldehyde separator is connected with a gas inlet at the bottom of a dilute aldehyde absorption tower, filler is arranged in the dilute aldehyde absorption tower, an absorption liquid spray pipe is arranged above the filler in the dilute aldehyde absorption tower, dilute aldehyde at the bottom of the dilute aldehyde absorption tower is conveyed to a dilute aldehyde condenser through a tower bottom extraction pipeline or directly conveyed to a urotroping mother liquor tank or to a concentrated dilute aldehyde tank, an outlet pipeline of the dilute aldehyde condenser is connected with an absorption liquid spray pipe, the dilute aldehyde absorption tower top steam pipeline is connected with the dilute aldehyde tower top condenser, the outlet pipeline of the dilute aldehyde tower top condenser is connected with the liquid separating pipe, the bottom liquid outlet pipeline of the liquid separating pipe is connected with the lower liquid return pipe of the dilute aldehyde absorption tower, the upper gas outlet pipeline of the liquid separating pipe is connected with the dilute aldehyde vacuum pump, the outlet pipeline of the dilute aldehyde vacuum pump is connected with the vacuum water tank, part of dilute aldehyde in the vacuum water tank is cooled by the plate cooler and then supplied to the dilute aldehyde vacuum pump for water supplement, and the other part of dilute aldehyde is extracted to the urotropine mother liquid tank or to the concentrated dilute aldehyde tank.
50% of formaldehyde solution enters a climbing film evaporator, enters a concentrated aldehyde separator of the climbing film evaporator after evaporation and concentration, and 70% of separated formaldehyde liquid enters a concentrated aldehyde tank through a concentrated aldehyde receiving tank pump. And then the mixture enters a target dryer and flake caustic soda is added to prepare paraformaldehyde. The separated dilute formaldehyde gas enters a dilute aldehyde absorption tower, part of dilute formaldehyde at the bottom of the dilute aldehyde absorption tower circulates after being cooled, part of dilute formaldehyde is extracted to a 20% dilute aldehyde tank, the gas at the top of the tower is condensed and then is subjected to liquid separation through a liquid separation pipe, liquid after liquid separation returns to the bottom of the dilute aldehyde absorption tower, the gas is pumped away to a vacuum water tank by a dilute aldehyde vacuum pump, part of dilute formaldehyde in the vacuum water tank is cooled and then supplied to a dilute aldehyde vacuum pump for work and water supplement, and part of dilute formaldehyde is extracted to a urotropine mother liquor tank or to a concentrated dilute aldehyde tank.
In the scheme, the method comprises the following steps: and a tail gas pipeline is arranged at the top of the concentrated aldehyde tank. Collecting and treating tail gas of the concentrated aldehyde tank.
In the scheme, the method comprises the following steps: and a steam heating pipeline is arranged in the concentrated aldehyde tank.
In the scheme, the method comprises the following steps: the tail gas pipeline at the top of the tower of the target dryer is connected with a tail gas inlet pipeline of a dry tail gas absorption tower, the dry tail gas absorption tower comprises a horizontal absorption water tank, a vertical absorption tower is arranged in the middle of the upper side of the horizontal absorption water tank, a condensate water coil pipe is arranged at the lower part of the vertical absorption tower, the space above the condensate water coil pipe is divided into an upper section and a lower section by an inclined partition plate which can be penetrated by gas, a filler is arranged at the lower part of each section, an upper spray pipe and a lower spray pipe are respectively arranged above the filler of each section, the tail gas inlet pipeline is arranged on the horizontal absorption water tank, dilute aldehyde in the horizontal absorption water tank is partially extracted by a drying circulating pump and partially flows back to the lower spray pipe, a circulating pipeline is arranged at the bottom of the upper section of the vertical absorption tower and is connected with a circulating pump, an outlet pipeline of the tower top condenser is connected with an upper spray pipe, a tower top gas outlet pipeline of the vertical absorption tower is connected with the tower top gas condenser, an outlet pipeline of the tower top gas condenser is connected with a dry tail gas liquid separating pipe, a bottom liquid outlet of the dry tail gas liquid separating pipe is connected with a horizontal absorption water tank, an upper gas outlet of the dry tail gas liquid separating pipe is connected with a tail gas vacuum pump, an outlet of the tail gas vacuum pump is connected with a concentrated emptying collecting tank, and dilute aldehyde in the concentrated emptying collecting tank is cooled by the concentrated emptying collecting tank condenser and then serves as tail gas vacuum pump to supplement water; the tank top of concentrating the unloading collecting vat is provided with unloading tail gas pipeline and links to each other with the gaseous import at the bottom of concentrating the unloading absorption tower, be provided with the filler in the concentrated unloading absorption tower, the top of filler is provided with the unloading shower, the top of the tower of concentrating the unloading absorption tower sets up the unloading pipeline, the tower bottom of concentrating the unloading absorption tower is provided with the circulation pipeline and concentrates the unloading collecting vat and concentrate the unloading circulating pump and link to each other, the export pipeline of concentrating the unloading circulating pump links to each other with the unloading shower.
And tail gas at the top of the target dryer enters a dry tail gas absorption tower to be cooled and absorbed. The diluted formaldehyde at the bottom of the absorption tower partially circulates to a lower spray pipe, and the diluted formaldehyde is partially extracted to a 20% diluted formaldehyde tank or a urotropine mother liquor tank. Liquid at the upper section of the absorption tower is cooled and then flows back to the upper spray pipe. And the incompletely absorbed dilute formaldehyde gas is condensed and pumped into a centralized emptying collecting tank in a dry tail gas liquid separating pipe by a vacuum pump. And the diluted aldehyde in the concentrated emptying collecting tank is cooled and then supplied to a vacuum pump for water supplement. And the gas in the concentrated emptying collecting tank is sprayed and absorbed by the concentrated emptying absorption tower and then discharged, and the tower bottom of the concentrated emptying absorption tower circulates to an emptying spray pipe or enters the concentrated emptying collecting tank or is sent to a urotropine mother liquor tank or a concentrated dilute aldehyde tank.
In the scheme, the method comprises the following steps: and a tank top tail gas pipeline of the concentrated aldehyde tank is connected with an emptying tail gas pipeline.
In the scheme, the method comprises the following steps: and an outlet pipeline of the centralized emptying circulating pump is connected to a urotropine mother liquor tank or a concentrated dilute aldehyde tank.
Has the advantages that: the utility model discloses a paraformaldehyde production system formaldehyde is concentrated efficiently, the whole recycle of rare formaldehyde in the concentration process. The tail gas generated by the target dryer is recycled and then discharged up to the standard, the formaldehyde in the target dryer is fully recovered, air pollution caused by the formaldehyde tail gas is avoided, and the effects of emission reduction and environmental protection are achieved.
Drawings
FIG. 1 is a flow chart of a system for producing paraformaldehyde in a process system of the present invention.
FIG. 2 is a flow diagram of tail gas recovery.
Detailed Description
The invention will be further described by way of examples with reference to the accompanying drawings:
example 1, as shown in fig. 1-2, a system for producing paraformaldehyde from 50% formaldehyde comprises a climbing film evaporator, 50% formaldehyde enters from the bottom of a heating chamber 1 of the climbing film evaporator, and enters a concentrated aldehyde separator 2 of the climbing film evaporator after being vaporized, wherein the top, upper and lower parts of the concentrated aldehyde separator are provided with steam heating pipelines 3, and the heating chamber 1 of the climbing film evaporator is heated by steam. The bottom end of the concentrated aldehyde separator 2 is provided with a concentrated aldehyde extraction pipeline connected with a concentrated aldehyde receiving tank 4, concentrated aldehyde in the concentrated aldehyde receiving tank 4 is connected with a concentrated aldehyde tank 6 through a concentrated aldehyde extraction pump 5, the top of the concentrated aldehyde tank 6 is provided with a tail gas pipeline 601, and the concentrated aldehyde tank 6 is internally provided with a steam heating pipeline 3. Concentrated aldehyde in a concentrated aldehyde groove 6 is sent to a target dryer 8 through a rake-drying feeding 7, a gas outlet at the top of a concentrated aldehyde separator 2 is connected with a gas inlet at the bottom of a dilute aldehyde absorption tower 9, a filler is arranged in the dilute aldehyde absorption tower 9, an absorption liquid spray pipe 901 is arranged above the filler in the dilute aldehyde absorption tower 9, the dilute aldehyde at the bottom of the dilute aldehyde absorption tower 9 is pumped to a dilute aldehyde condenser 10 or directly pumped to a urotroping mother liquor tank or to a concentrated dilute aldehyde groove through a tower bottom extraction pipeline, an outlet pipeline of the dilute aldehyde condenser 10 is connected with the absorption liquid spray pipe 901, a steam pipeline at the top of the dilute aldehyde absorption tower 9 is connected with a dilute aldehyde tower top condenser 11, an outlet pipeline of the dilute aldehyde tower top condenser 11 is connected with a liquid distribution pipe 12, a bottom liquid outlet pipeline of the liquid distribution pipe 12 is connected with the lower part of the dilute aldehyde absorption tower 9, an upper gas outlet pipeline of the liquid distribution pipe 12 is connected with a dilute aldehyde, an outlet pipeline of the dilute aldehyde vacuum pump 13 is connected with a vacuum water tank 14, part of the dilute aldehyde in the vacuum water tank 14 is cooled by a plate cooler 15 and then supplied to the dilute aldehyde vacuum pump 13 for water supplement, and part of the dilute aldehyde is extracted to a urotropine mother liquor tank or a concentrated dilute aldehyde tank.
The tail gas pipeline at the top of the target dryer 8 is connected with the tail gas inlet pipeline of the dry tail gas absorption tower 16, the dry tail gas absorption tower 16 comprises a horizontal absorption water tank 1601, a vertical absorption tower 1602 is arranged in the middle of the upper side of the absorption water tank 1601, a condensed water coil 1603 is arranged at the lower part of the vertical absorption tower 1602, the space above the condensed water coil 1603 is divided into an upper section and a lower section by an inclined partition plate which can be penetrated by gas, a filler 1604 is arranged at the lower part of each section, an upper spray pipe 1606 and a lower spray pipe 1605 are respectively arranged above the filler 1604 of each section, the tail gas inlet pipeline is arranged on the horizontal absorption water tank 1601, the dilute aldehyde in the horizontal absorption water tank 1601 is partially collected by a dry circulating pump 17 and partially flows back to the lower spray pipe 1605, a circulating pipeline is arranged at the bottom of the upper section of the vertical absorption tower 1602 and is connected with a tower, the outlet pipeline of top of the tower condenser 19 links to each other with last shower 1606, the top of the tower gas outlet pipeline of vertical absorption tower 1602 links to each other with top of the tower gas condenser 20, top of the tower gas condenser 20's outlet pipeline divides liquid pipe 21 with dry tail gas to link to each other, the bottom liquid outlet that dry tail gas divides liquid pipe 21 links to each other with horizontal absorption water tank 1601, the upper portion gas outlet that dry tail gas divides liquid pipe 21 links to each other with tail gas vacuum pump 22, tail gas vacuum pump 22's export links to each other with concentrated unloading collecting vat 23, the dilute aldehyde of concentrated unloading collecting vat 23 is as tail gas vacuum pump 22 work moisturizing after concentrating unloading collecting vat condenser 24 cooling. The top of the concentrated emptying collecting tank 23 is provided with an emptying tail gas pipeline connected with the tower bottom gas inlet of the concentrated emptying absorption tower 25, and the tank top tail gas pipeline 601 of the concentrated aldehyde tank 6 is connected with the emptying tail gas pipeline. Be provided with the filler in concentrating unloading absorption tower 25, the top of filler is provided with the blowdown shower, and the top of the tower of concentrating unloading absorption tower sets up the unloading pipeline, and the tower bottom of concentrating unloading absorption tower 25 is provided with the circulation pipeline and concentrates unloading collecting vat 23 and concentrate unloading circulating pump 26 and link to each other, and the outlet pipeline of concentrating unloading circulating pump 26 links to each other with the blowdown shower. An outlet line of the concentrated emptying circulating pump 26 is connected to a urotropine mother liquor tank or a concentrated dilute aldehyde tank.
The present invention is not limited to the above embodiments, and those skilled in the art can understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A production system for producing paraformaldehyde by using 50% formaldehyde comprises a climbing film evaporator and is characterized in that: 50% of formaldehyde enters from the bottom of a heating chamber of the climbing film evaporator, and enters a concentrated aldehyde separator of the climbing film evaporator after being vaporized, wherein the top end, the upper part and the lower part of the concentrated aldehyde separator are respectively provided with a steam heating pipeline, the bottom end of the concentrated aldehyde separator is provided with a concentrated aldehyde extraction pipeline connected with a concentrated aldehyde receiving tank, concentrated aldehyde in the concentrated aldehyde receiving tank is connected with a concentrated aldehyde tank through a concentrated aldehyde extraction pump, concentrated aldehyde in the concentrated aldehyde tank is conveyed to a target dryer through a rake drying feeding pump, a gas outlet at the top of the concentrated aldehyde separator is connected with a gas inlet at the bottom of a dilute aldehyde absorption tower, filler is arranged in the dilute aldehyde absorption tower, an absorption liquid spray pipe is arranged above the filler in the dilute aldehyde absorption tower, dilute aldehyde at the bottom of the dilute aldehyde absorption tower is conveyed to a dilute aldehyde condenser through a tower bottom extraction pipeline or directly conveyed to a urotroping mother liquor tank or to a concentrated dilute aldehyde tank, an outlet pipeline of the dilute aldehyde condenser is connected with an absorption liquid spray pipe, the dilute aldehyde absorption tower top steam pipeline is connected with the dilute aldehyde tower top condenser, the outlet pipeline of the dilute aldehyde tower top condenser is connected with the liquid separating pipe, the bottom liquid outlet pipeline of the liquid separating pipe is connected with the lower liquid return pipe of the dilute aldehyde absorption tower, the upper gas outlet pipeline of the liquid separating pipe is connected with the dilute aldehyde vacuum pump, the outlet pipeline of the dilute aldehyde vacuum pump is connected with the vacuum water tank, part of dilute aldehyde in the vacuum water tank is cooled by the plate cooler and then supplied to the dilute aldehyde vacuum pump for water supplement, and the other part of dilute aldehyde is extracted to the urotropine mother liquid tank or to the concentrated dilute aldehyde tank.
2. The system for producing paraformaldehyde according to claim 1, wherein the system further comprises: and a tail gas pipeline is arranged at the top of the concentrated aldehyde tank.
3. The system for producing paraformaldehyde according to claim 2, wherein the system further comprises: and a steam heating pipeline is arranged in the concentrated aldehyde tank.
4. The system for producing paraformaldehyde according to any one of claims 2-3, wherein the system further comprises: the tail gas pipeline at the top of the tower of the target dryer is connected with a tail gas inlet pipeline of a dry tail gas absorption tower, the dry tail gas absorption tower comprises a horizontal absorption water tank, a vertical absorption tower is arranged in the middle of the upper side of the horizontal absorption water tank, a condensate water coil pipe is arranged at the lower part of the vertical absorption tower, the space above the condensate water coil pipe is divided into an upper section and a lower section by an inclined partition plate which can be penetrated by gas, a filler is arranged at the lower part of each section, an upper spray pipe and a lower spray pipe are respectively arranged above the filler of each section, the tail gas inlet pipeline is arranged on the horizontal absorption water tank, dilute aldehyde in the horizontal absorption water tank is partially extracted by a drying circulating pump and partially flows back to the lower spray pipe, a circulating pipeline is arranged at the bottom of the upper section of the vertical absorption tower and is connected with a circulating pump, an outlet pipeline of the tower top condenser is connected with an upper spray pipe, a tower top gas outlet pipeline of the vertical absorption tower is connected with the tower top gas condenser, an outlet pipeline of the tower top gas condenser is connected with a dry tail gas liquid separating pipe, a bottom liquid outlet of the dry tail gas liquid separating pipe is connected with a horizontal absorption water tank, an upper gas outlet of the dry tail gas liquid separating pipe is connected with a tail gas vacuum pump, an outlet of the tail gas vacuum pump is connected with a concentrated emptying collecting tank, and dilute aldehyde in the concentrated emptying collecting tank is cooled by the concentrated emptying collecting tank condenser and then serves as tail gas vacuum pump to supplement water; the tank top of concentrating the unloading collecting vat is provided with unloading tail gas pipeline and links to each other with the gaseous import at the bottom of concentrating the unloading absorption tower, be provided with the filler in the concentrated unloading absorption tower, the top of filler is provided with the unloading shower, the top of the tower of concentrating the unloading absorption tower sets up the unloading pipeline, the tower bottom of concentrating the unloading absorption tower is provided with the circulation pipeline and concentrates the unloading collecting vat and concentrate the unloading circulating pump and link to each other, the export pipeline of concentrating the unloading circulating pump links to each other with the unloading shower.
5. The system for producing paraformaldehyde according to claim 4, wherein the system further comprises: and a tank top tail gas pipeline of the concentrated aldehyde tank is connected with an emptying tail gas pipeline.
6. The system for producing paraformaldehyde according to claim 5, wherein the system further comprises: and an outlet pipeline of the centralized emptying circulating pump is connected to a urotropine mother liquor tank or a concentrated dilute aldehyde tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022393086.2U CN213652344U (en) | 2020-10-23 | 2020-10-23 | Utilize production system of 50% formaldehyde production paraformaldehyde |
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| CN202022393086.2U CN213652344U (en) | 2020-10-23 | 2020-10-23 | Utilize production system of 50% formaldehyde production paraformaldehyde |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114591287A (en) * | 2022-03-09 | 2022-06-07 | 赛鼎工程有限公司 | Process for synthesizing and concentrating trioxymethylene |
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2020
- 2020-10-23 CN CN202022393086.2U patent/CN213652344U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114591287A (en) * | 2022-03-09 | 2022-06-07 | 赛鼎工程有限公司 | Process for synthesizing and concentrating trioxymethylene |
| CN114591287B (en) * | 2022-03-09 | 2024-03-22 | 赛鼎工程有限公司 | Process for synthesizing and concentrating trioxymethylene |
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