CN211158651U - Device for recovering cyclohexane from acrylate production - Google Patents
Device for recovering cyclohexane from acrylate production Download PDFInfo
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- CN211158651U CN211158651U CN201921642106.6U CN201921642106U CN211158651U CN 211158651 U CN211158651 U CN 211158651U CN 201921642106 U CN201921642106 U CN 201921642106U CN 211158651 U CN211158651 U CN 211158651U
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Abstract
The utility model relates to a device for recovering cyclohexane from acrylate production, which comprises a stripping heat exchanger, a stripping tower connected with the stripping heat exchanger, a gas buffer tank connected with the stripping tower, an emptying condenser connected with the gas buffer tank, a compression buffer tank connected with the emptying condenser, a total emptying condenser connected with the compression buffer tank, a total emptying receiving tank connected with the total emptying condenser, a gas drier connected with the total emptying receiving tank, and the other end of the gas drier connected with the stripping heat exchanger; a water ring pump is arranged between the gas buffer tank and the emptying condenser, and the bottom center of the emptying condenser is also communicated with an emptying receiving tank; and a compression pump is arranged between the emptying condenser and the compression buffer tank. The utility model has the advantages that: the utility model discloses the device has not only satisfied the environmental protection requirement but also retrieved partial cyclohexane, has reached win-win purpose again for the environmental protection performance is better and cyclohexane recovery efficiency is higher.
Description
Technical Field
The utility model belongs to the technical field of fine chemistry industry, a acrylate apparatus for producing is related to, in particular to retrieve device of cyclohexane in the production of follow acrylic ester.
Background
The tail gas generated in the production process of the acrylic ester is mainly solvent cyclohexane, and the cyclohexane has a low boiling point of only 80.7 ℃, so that the cyclohexane is easy to volatilize, and the tail gas hardly meets the requirement of environmental protection and emission without corresponding treatment measures.
In the face of increasingly severe environmental requirements, emission standards are easily exceeded when slight control is not available in production. At present, most of domestic manufacturers directly discharge the tail gas containing cyclohexane into the atmosphere, a very small number of manufacturers can connect the tail gas into an RTO system of a company to burn, and the two tail gas treatment methods have respective advantages and disadvantages: the first method is to directly discharge tail gas into the atmosphere, which inevitably causes environmental pollution and cannot meet the increasingly severe environmental protection requirement; the second is gone to burn tail gas and is burnt and avoided the polluted environment, but implements dangerously greatly, because cyclohexane is inflammable explosive chemicals, leads to the tempering in the tail gas burning process, can threaten whole apparatus for producing, this can follow in recent years RTO burns the in-process and explodes and can learn, burns the white burning of solvent cyclohexane in the burning process in addition and really is the cherish, therefore two kinds of tail gas processing methods that have now are neither the most suitable.
By search, patent CN 103055532B discloses an apparatus for recovering cyclohexane in the production of polyol acrylate, which comprises: the tail gas inlet pipe is a compression circulating condenser, a compression buffer tank, a compression receiving tank, a total emptying condenser, an emptying separator and a total emptying receiving tank which are sequentially connected through a pipeline; polyol (meth) acrylate production in retrieve device of cyclohexane, structural design is reasonable, convenient operation, degree of automation is high, the operation is reliable, the feature of environmental protection is good, cyclohexane recovery efficiency is high, cyclohexane content in the tail gas can reduce to below 5%, recovery efficiency can improve more than 2 times than condensation method and spraying method, and compare with the method that cold water sprayed, area is little, change the operation, the security is higher, nevertheless there is certain defect in the device of retrieving cyclohexane in this polyol acrylate production: the tail gas separated by the emptying separator is still doped with low-content cyclohexane, and further, part of cyclohexane is lost.
Therefore, it is necessary to develop a device for recovering cyclohexane from acrylate production, which has better environmental protection performance and higher cyclohexane recovery efficiency.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a better and higher device of retrieving cyclohexane from acrylate production of cyclohexane recovery efficiency of environmental protection performance.
In order to solve the technical problem, the utility model adopts the technical scheme that: the device for recovering cyclohexane from acrylate production is characterized in that: the device comprises a stripping heat exchanger, a stripping tower connected with the stripping heat exchanger, a gas buffer tank connected with the stripping tower, an emptying condenser connected with the gas buffer tank, a compression buffer tank connected with the emptying condenser, a total emptying condenser connected with the compression buffer tank, a total emptying receiving tank connected with the total emptying condenser, a gas drier connected with the total emptying receiving tank, and the other end of the gas drier connected with the stripping heat exchanger;
a water ring pump is arranged between the gas buffer tank and the emptying condenser, and the bottom center of the emptying condenser is also communicated with an emptying receiving tank;
and a compression pump is arranged between the emptying condenser and the compression buffer tank.
Furthermore, the number of the water ring pumps is two, and the water ring pumps are arranged between the gas buffer tank and the emptying condenser in parallel.
The utility model has the advantages that:
(1) the utility model discloses retrieve device of cyclohexane from acrylic ester production, utilize this lower physical property of boiling point of cyclohexane, tail gas that the condensation was passed through is cyclic utilization in the dry rethread stripper, the material bubbles the material with hot-air under the negative pressure condition after getting into the stripper promptly, take out partial moisture in the material and solvent cyclohexane, then the gaseous phase of taking out passes through the primary condensation, condense some solvents, the cyclohexane that does not get off carries out the secondary condensation after the compression pump pressurization, only have 200 in the tail gas that comes out from total atmospheric condenser secondary condenser and 300 PPm's cyclohexane, get back to the stripper again after this part tail gas through dry dewatering and carry out the bubbling, reuse, pipeline is used for directly emptying all the way in addition, automatic emptying after the pressure has been high in the system, cyclohexane when emptying probably is about 50PPm, the device not only meets the requirement of environmental protection, but also recovers part of cyclohexane, thereby achieving the purpose of win-win, ensuring better environmental protection performance and higher cyclohexane recovery efficiency;
(2) the utility model discloses retrieve device of cyclohexane in the production of follow acrylic ester, wherein, the water ring pump has two, parallelly connected the installation between gas buffer tank and the condenser of emptying, divides the multichannel function, and then can improve production efficiency greatly.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural diagram of the device for recovering cyclohexane from acrylate production according to the present invention.
Detailed Description
The following examples are presented to enable those skilled in the art to more fully understand the present invention and are not intended to limit the scope of the present invention.
Examples
The device of embodiment recovery cyclohexane from acrylate production, as shown in figure 1, including stripping heat exchanger 1, the stripper 2 that links to each other with stripping heat exchanger 1, the gas buffer tank 3 that links to each other with stripper 2, the blow down condenser 5 that links to each other with gas buffer tank 3, the compression buffer tank 7 that links to each other with blow down condenser 5, total blow down condenser 8 that links to each other with compression buffer tank 7, total blow down receiving tank 9 that links to each other with total blow down condenser 8, gas desicator 10 that links to each other with total blow down receiving tank 9, and the other end of gas desicator 10 is connected with stripping heat exchanger 1.
Two water ring pumps 4 are arranged in parallel between the gas buffer tank 3 and the emptying condenser 5 and operate in multiple paths, so that the production efficiency can be greatly improved; the bottom center of the emptying condenser 5 is also communicated with an emptying receiving tank 11, and a compression pump 6 is arranged between the emptying condenser 5 and the compression buffer tank 7.
The working process of the device for recovering cyclohexane from the production of acrylic ester in the embodiment is as follows:
step 1: when the stripping tower 2 is started, firstly, 30% of liquid level acrylic ester enters the stripping tower 2, then the stripping tower 2 is vacuumized to negative pressure of 10KPa, compressed air is heated to 50-60 ℃ through a preheater and then enters the stripping tower 2, and components with low boiling points such as solvent and water in the tower are taken out;
step 2: the gas phase pumped out by the water ring pump 4 is condensed for the first time through the emptying condenser 5, part of the solvent and water are cooled and come into the emptying receiving tank 11, the gas phase which is not condensed is connected to the inlet of the tail gas compression pump 6, compressed through the compression pump 6 and then condensed for the second time through the total emptying condenser 8, and the cyclohexane in the discharged tail gas is approximately 200-300 PPm;
and step 3: when the pressure of the total emptying receiving tank 9 reaches about 3kg, the total emptying receiving tank 9 is opened to remove the gas dryer 10, the dried tail gas is switched to the gas source of the stripping tower 2, the original compressed air is closed, and the tail gas is recycled;
and 4, step 4: if the pressure of the tail gas of the system is more than 3.5kg due to the discharging in the previous process, the pneumatic valve on the main emptying pipe automatically releases the pressure to ensure that the pressure is not exceeded;
and 5: after the dried tail gas is circularly cooled by the stripping heat exchanger 1, the cyclohexane of the tail gas after each time of emptying is measured to be within 100PPm and basically within 50-60PPm, so that the requirements of solvent recovery and environmental protection are met.
The basic principles and main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. An apparatus for recovering cyclohexane from acrylate production, characterized in that: the device comprises a stripping heat exchanger, a stripping tower connected with the stripping heat exchanger, a gas buffer tank connected with the stripping tower, an emptying condenser connected with the gas buffer tank, a compression buffer tank connected with the emptying condenser, a total emptying condenser connected with the compression buffer tank, a total emptying receiving tank connected with the total emptying condenser, a gas drier connected with the total emptying receiving tank, and the other end of the gas drier connected with the stripping heat exchanger;
a water ring pump is arranged between the gas buffer tank and the emptying condenser, and the bottom center of the emptying condenser is also communicated with an emptying receiving tank;
and a compression pump is arranged between the emptying condenser and the compression buffer tank.
2. The apparatus for recovering cyclohexane from acrylate production according to claim 1, characterized in that: and the two water ring pumps are arranged in parallel and are arranged between the gas buffer tank and the emptying condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921642106.6U CN211158651U (en) | 2019-09-29 | 2019-09-29 | Device for recovering cyclohexane from acrylate production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921642106.6U CN211158651U (en) | 2019-09-29 | 2019-09-29 | Device for recovering cyclohexane from acrylate production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211158651U true CN211158651U (en) | 2020-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921642106.6U Active CN211158651U (en) | 2019-09-29 | 2019-09-29 | Device for recovering cyclohexane from acrylate production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211158651U (en) |
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2019
- 2019-09-29 CN CN201921642106.6U patent/CN211158651U/en active Active
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