CN109824481A - A kind of remodeling method of acetaldehyde system improving yield - Google Patents
A kind of remodeling method of acetaldehyde system improving yield Download PDFInfo
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- CN109824481A CN109824481A CN201910131995.8A CN201910131995A CN109824481A CN 109824481 A CN109824481 A CN 109824481A CN 201910131995 A CN201910131995 A CN 201910131995A CN 109824481 A CN109824481 A CN 109824481A
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Abstract
The invention discloses a kind of remodeling methods of acetaldehyde system improving yield, include the following steps, A, Ethanal distillation column system is transformed, original two layers of corrugated plating is removed, wherein one layer is changed to guide float-valve tower, another layer is changed to wire packing, and increase heating jacket at rectifying column bottom, steam loss is reduced, while tower body increases 3 meters, improves distilling effect；B, increase freezing water condenser between stripper and stripping tail gas condensing liquid storage tank, stripping lime set temperature is down to 18 DEG C by 42 DEG C, reduces acetaldehyde escape amount.The remodeling method of the acetaldehyde system improving yield more efficiently extracts acetaldehyde from acetaldehyde system, improves extraction efficiency, reduces acetaldehyde escape.
Description
Technical field:
The present invention relates to production of polyester fields, are especially a kind of remodeling method of acetaldehyde system improving yield.
Background technique:
Existing acetaldehyde system includes esterification water stripping, the systems such as acetaldehyde rectifying and the purification of reuse ethylene glycol.Polyester device ester
Change steam to mention using steam stripping, which enables the acetaldehyde overwhelming majority in technique waste water to go out by stripper top row, shape
At the mixed tail gas of acetaldehyde and water vapour, wherein acetaldehyde concentration is 8-12%.Tail gas is stripped after stripping tail gas condenser condensation,
It is crossed again with chilled water and is cooled to 42 DEG C hereinafter, lime set is then sent to the further rectification and purification acetaldehyde of Ethanal distillation column.Rectifying tower top temperature
Degree is controlled using certain reflux ratio at 43-46.8 DEG C, operating pressure 0.15MPa, obtains purity on Ethanal distillation column top at this time
Industrial acetaldehyde greater than 98%.
The associated matter of acetaldehyde and ethylene glycol decomposed in Ethanal distillation column generates acetaldehyde and ethylene glycol, and acetaldehyde is in tower top
Enrichment, ethylene glycol are enriched in tower reactor.Ethanal distillation column kettle obtains the lower glycol water of concentration, and tower bottoms passes through ethylene glycol
Purifying column distilation, by water and other a small amount of organic matters from removed overhead, ethylene glycol purification tower reactor obtains concentration greater than 85%
Ethylene glycol, this part ethylene glycol through pump be delivered to PET master device reuse.
Summary of the invention:
The technical problem to be solved by the invention is to provide one kind more efficiently to extract acetaldehyde from acetaldehyde system, mentions
High extracting efficiency reduces acetaldehyde escape, increases the remodeling method of the acetaldehyde system improving yield of process loops.
The technical solution of the invention is as follows, provides a kind of remodeling method of acetaldehyde system improving yield, including following step
Suddenly,
A, Ethanal distillation column system is transformed, original two layers of corrugated plating is removed, wherein one layer is changed to guide float-valve tower, separately
One layer is changed to wire packing, and increases heating jacket at rectifying column bottom, reduces steam loss, while tower body increases 3 meters, improves
Distilling effect；
B, increase freezing water condenser between stripper and stripping tail gas condensing liquid storage tank, by stripping lime set temperature by 42
18 DEG C DEG C are down to, acetaldehyde escape amount is reduced；
C, the stripping tail gas fixed gas for being originally delivered to coal stove burning is taken back into esterification waste water tank and strips separation and recovery again,
Improve acetaldehyde recovery amount；
D, polyplant process tower is accessed containing the wastewater of rectification of ethylene glycol and acetaldehyde in the part for coming out Ethanal distillation column,
Ethylene glycol and acetaldehyde are recycled using the working environment of process tower.
Using after above scheme compared with prior art, the invention has the following advantages that effectively being mentioned after taking the above measure
High acetaldehyde tail gas condensing efficiency reduces the temperature of stripping tail gas lime set, improves acetaldehyde purification & isolation efficiency, reduces steam consumption
With tower top acetaldehyde regurgitant volume, while containing acetaldehyde escape amount, promote stripping effect, reduces exhaust gas discharge and sewage treatment load,
Significantly improve yield.Not only make its safety be improved the optimization of acetaldehyde recovery and obtain economic benefit and
Social benefit.
Detailed description of the invention:
Fig. 1 is the structural diagram of the present invention.
Specific embodiment:
With regard to specific embodiment, the invention will be further described with reference to the accompanying drawing:
Transformation is optimized on the basis of retaining existing equipment, is achieved the goal on the basis of save the cost.
The considerations of proposing production system mainly for acetaldehyde direction:
(1) collection of esterification water.
(2) extraction efficiency of rectifying column.
(3) since exhaust gas discharges, to consider wherein acetaldehyde escape.
(4) esterification water in system after Ethanal distillation column can be extracted again.
Analyze original acetaldehyde recovery apparatus system:
(1) rectifying tower system is inefficient, causes most of 2-MD undecomposed, and undecomposed 2-MD enters hot Media Oven and burnt
It burns；
(2) acetaldehyde volatile quantity and escape amount in esterification water system and stripping exhaust system is higher, leads to acetaldehyde recovery rate
It is relatively low；
(3) from the point of view of existing creation data, the steam consumption of Ethanal distillation column is bigger than normal, and acetaldehyde regurgitant volume is bigger than normal, this
From illustrating that rectifying tower internals effect is poor on the other hand, efficiency is relatively low.
(4) Ethanal distillation column cannot directly use self-produced saturated vapor as heat source, after need and steam power plant's steam are grid-connected,
Acetaldehyde purity can just be guaranteed, and the efficiency and acetaldehyde overhead reflux unit for reflecting rectifying column mismatch.
(5) stripping system low efficiency causes the acetaldehyde in esterification water that cannot be efficiently extracted completely.
(6) enter coal stove after vacuum system tail gas is directly collected in polyplant to burn, contain higher concentration in the tail gas
Aldehydes gas, do not collected effectively.
According to the particularity of acetaldehyde product, for the reliable and stable operation for guaranteeing acetaldehyde device, in the material of media contact
It is particularly important in selection and the design of safety.But due to the limitation of acetaldehyde device existing equipment, it is desirable to propose production completely to the same industry
Superior level needs to put into the melting pot acetaldehyde recovery device, and the Period Process is too long, and cost is too high, and feasibility is not high.
According to the configuration of existing acetaldehyde recovery device, it is contemplated that reasonable cost of investment and need volume increase purpose to be achieved,
After study, more satisfactory volume increase technical reform scheme is as follows, can refer to Fig. 1:
Include the following steps,
A, Ethanal distillation column system is transformed, original two layers of corrugated plating is removed, wherein one layer is changed to guide float-valve tower, separately
One layer is changed to wire packing, and increases heating jacket at rectifying column bottom, reduces steam loss, while tower body increases 3 meters, improves
Distilling effect；
B, increase freezing water condenser between stripper and stripping tail gas condensing liquid storage tank, by stripping lime set temperature by 42
18 DEG C DEG C are down to, acetaldehyde escape amount is reduced；
C, the stripping tail gas fixed gas for being originally delivered to coal stove burning is taken back into esterification waste water tank and strips separation and recovery again,
Improve acetaldehyde recovery amount；
D, polyplant process tower is accessed containing the wastewater of rectification of ethylene glycol and acetaldehyde in the part for coming out Ethanal distillation column,
Ethylene glycol and acetaldehyde are recycled using the working environment of process tower.Aforementioned four step in no particular order, effectively shares EG points
Workload from tower, had not only reduced the energy consumption of EG knockout tower, but also improved acetaldehyde recovery yield.
Observation by 20 days is compared, and can be known, acetaldehyde average product before being transformed: 2.62t/d, acetaldehyde is average after transformation
Yield: 3.4689t/d increases production 0.8489t/d, rate of growth 32.4%.
Benefit incrementss (acetaldehyde unit price is in terms of 6500 yuan/ton) after transformation:
0.8489 × 6500=5433 member/d
After taking the above measure, acetaldehyde tail gas condensing efficiency is effectively improved, reduces the temperature of stripping tail gas lime set, improves second
Aldehyde purification & isolation efficiency reduces steam consumption and tower top acetaldehyde regurgitant volume, while containing acetaldehyde escape amount, promotes stripping effect,
Reduce exhaust gas discharge and sewage treatment load, hence it is evident that improve yield.Its safety is not only made to the optimization of acetaldehyde recovery
It is improved and obtains economic benefit and social benefit.
Only the preferred embodiment of the present invention has been described above, but is not to be construed as limiting the scope of the invention.It is all
The equivalent structure or equivalent flow shift done using description of the invention, be included in scope of patent protection of the invention it
It is interior.
Claims (1)
1. a kind of remodeling method of acetaldehyde system improving yield, it is characterised in that: include the following steps,
A, Ethanal distillation column system is transformed, original two layers of corrugated plating is removed, wherein one layer is changed to guide float-valve tower, another layer
It is changed to wire packing, and increases heating jacket at rectifying column bottom, steam loss is reduced, while tower body increases 3 meters, improves distillation
Effect；
B, increase freezing water condenser between stripper and stripping tail gas condensing liquid storage tank, stripping lime set temperature is dropped by 42 DEG C
To 18 DEG C, acetaldehyde escape amount is reduced；
C, the stripping tail gas fixed gas for being originally delivered to coal stove burning is taken back into esterification waste water tank and strips separation and recovery again, improved
Acetaldehyde recovery amount；
D, polyplant process tower is accessed containing the wastewater of rectification of ethylene glycol and acetaldehyde in the part for coming out Ethanal distillation column, utilizes
The working environment of process tower recycles ethylene glycol and acetaldehyde.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910131995.8A CN109824481B (en) | 2019-02-22 | 2019-02-22 | Improvement method for improving yield of acetaldehyde system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910131995.8A CN109824481B (en) | 2019-02-22 | 2019-02-22 | Improvement method for improving yield of acetaldehyde system |
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| CN109824481A true CN109824481A (en) | 2019-05-31 |
| CN109824481B CN109824481B (en) | 2022-04-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111018925A (en) * | 2019-12-18 | 2020-04-17 | 广西浦北制药厂 | Steam system working process in trinosin production |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106831374A (en) * | 2017-01-11 | 2017-06-13 | 绍兴华强机械科技发展有限公司 | A kind of acetaldehyde recovery technique and Ethanal distillation column |
| CN107445802A (en) * | 2017-08-21 | 2017-12-08 | 上海聚友化工有限公司 | A kind of method that ethylene glycol and acetaldehyde are reclaimed in polyester waste water |
-
2019
- 2019-02-22 CN CN201910131995.8A patent/CN109824481B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106831374A (en) * | 2017-01-11 | 2017-06-13 | 绍兴华强机械科技发展有限公司 | A kind of acetaldehyde recovery technique and Ethanal distillation column |
| CN107445802A (en) * | 2017-08-21 | 2017-12-08 | 上海聚友化工有限公司 | A kind of method that ethylene glycol and acetaldehyde are reclaimed in polyester waste water |
Non-Patent Citations (1)
| Title |
|---|
| 乌云等: "《煤炭气化工艺与操作》", 31 May 2013, 北京理工大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111018925A (en) * | 2019-12-18 | 2020-04-17 | 广西浦北制药厂 | Steam system working process in trinosin production |
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