CN100497291C - Esterification tower reaction separation flow process for producing ethyl acetate - Google Patents
Esterification tower reaction separation flow process for producing ethyl acetate Download PDFInfo
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- CN100497291C CN100497291C CNB2004100663415A CN200410066341A CN100497291C CN 100497291 C CN100497291 C CN 100497291C CN B2004100663415 A CNB2004100663415 A CN B2004100663415A CN 200410066341 A CN200410066341 A CN 200410066341A CN 100497291 C CN100497291 C CN 100497291C
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- esterification column
- ethyl acetate
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Abstract
The present invention relates to ethyl acetate producing process in esterifying tower with high rectification effect. The technological scheme is that the acetic acid and ethanol solution after sulfuric acid catalyzed esterification is gasified under steam heating condition to form the azeotrope system of ester, water, alcohol and acid; and the azeotrope system is rectified and separated in an esterifying tower to obtain the coarse ester product in the top. The present invention features that inside the esterifying tower, there is regular ripple stainless steel sheet packing. The ripple stainless steel sheet packing has great specific surface area and high separation effect, consists of different sizes, and is optimized based on driving force mathematic model established according to material property and esterification and separation purity. The present invention has low esterifying tower resistance, and high esterification product purity with coarse ester content up to 95 %.
Description
One, technical field:
The present invention relates to production of ethyl technology, particularly relate to a kind of production ethyl acetate esterification column Reaction Separation flow process,, improve the product rectification effect by applied metal filler in esterification column.
Two, background technology:
Ethyl acetate product is to react synthetic by acetate and ethanol under the effect of sulfuric acid catalyst.Owing to added sulfuric acid in the system, so the formation and the material of equipment and filler are had higher requirement.Traditional esterification column is to adopt the porcelain ring filler basically, so acid corrosion-resistant is played a role.But the specific surface area of porcelain ring is little, and every meter number of theoretical plate is few, and the resistance of unit height is big, and tower height is increased.Because it is poor that the increase of packed height has increased the tower internal resistance again, and tower still reactive distillation has been caused adverse influence.Once the porcelain ring filler that tradition was huddled changes regular ceramic packing into, or changes tower into filler, sieve plate mixing column.On the drawing materials of filler, substantially break through the material of pottery, and use the regular ceramic packing in later stage because rigidity is strong, every layer assembled by tens, the assembly unit slit can't reach specified requirement, and bias current is caused in the slit, has a strong impact on the rectification effect of tower, and bad a large amount of fragmentations that also cause easily are installed, the clogged with fragments pipeline rises the tower resistance, the influence operation.
Three, summary of the invention:
The objective of the invention is to solve the frangible defective of ceramic material bias current in the prior art problem, the corrosion of improvement system, the rectification effect of raising esterification column prolongs on-stream time, obtains high-load product.
The present invention is performed such: a kind of production ethyl acetate esterification column Reaction Separation flow process, mixing raw material is thrown in the esterification column reactor, vaporize under steam-heated condition through the solution that carries out esterification behind the sulfuric acid catalysis, form ester, water, alcohol, azeotropic acid objects system, enter esterification column evaporation rectifying, separation, obtain product, it is characterized in that: filling metal thin plate structured packing in the evaporation rectification process of described esterification column, tower.The metal sheet structured packing of filling is the stainless steel sheet structured packing in the described esterification column, and 8～20 meters of total heights are loaded in this stainless steel sheet structured packing in described tower.The rolling ripple in Thin Stainless Steel plate ripple arranged packing upper punch hole, thickness of slab be at 0.1～0.5mm, the percentage of open area 5～10% of the rolling ripple of punching, and towards ripple peak height 4.3～12.5mm, the pitch of waves 7.3～10.2mm, the high 100～150mm of dish, bulk density is 200～700kg/m
3, upper and lower ripple intersection overlaps in described tower.Carry out rectifying in the esterification column that the metal sheet structured packing is housed, can obtain the ethyl acetate weight content to cat head is thick ester product more than 95%.Because the raising of performances such as metal sheet structured packing specific surface area, voidage has characteristics such as number of theoretical plate is many, resistance is little, uniform gas-liquid distribution, flux is big, scale effect is not obvious.
The invention has the beneficial effects as follows: of the present invention improving one's methods, unexpected content, especially water and the alcohol that has reduced water in the thick ethyl acetate product, alcohol, acid.The present invention has improved the content of ethyl acetate, has alleviated the load of concentration tower and treating tower in the subsequent technique, has reduced the generation of low ester byproduct, and the production capacity of tower got a promotion, and has reduced energy consumption, prolongs on-stream time more significantly.
Four, embodiment:
According to investigation, on esterification column, also do not adopt the tower of metallic stuffing at present, the just metal plate type tower that has.Because it is generally acknowledged that can not satisfy processing requirement work-ing life because the plate of metallic stuffing is thinner.But the advantage of metal structured packing also is clearly.At first, because its plate is thinner than pottery, its specific surface area is bigger than ceramic regulation filler, corresponding every meter number of theoretical plate 1～2 times of number of theoretical plate that rises on year-on-year basis.Under the situation that same height filler is installed, number of theoretical plate improves, and the also corresponding raising of the separating power of esterification column reduces the height of tower.Its two, channel and bias current phenomenon have been eliminated in metallic stuffing effectively, and column efficiency is improved.The 3rd is that the filler resistance descends (ceramic packing is frangible, causes filler to stop up, and increases resistance), helps the operation of esterifying kettle.Based on the advantage of metallic stuffing and the problem of metallic stuffing acid corrosion, the different processing condition of corresponding different tower height components, different heights is installed the metal sheet filler of unlike material, the preseparating structure of acid is installed in the bottom of filler simultaneously, make the corrosion thing not enter filler or enter filler less, guarantee the working life of filler.
Esterification column divides two big work systems: (1), esterification system; (2), separation system.
Reaction system is mainly reactor, and separation system comprises rectifying tower, overhead condenser, water cooler, ester water separator.Mixing raw material according to certain proportioning enters in the reactor, and the component and the weight percent proportioning that drop into the material in the esterification column reactor are: acetate 30～70%, ethanol 28～50%, water 2～20%.Keep 106 ± 5 ℃ of temperature in the kettle, the reaction product continuous gasification advances the metallic stuffing esterification column in the separation system, described metal sheet filler, adopt the rolling ripple of all kinds of stainless steel sheet punchings in an embodiment, thickness of slab is at 0.1～0.5mm, the percentage of open area 5～10% of the rolling ripple of punching, towards bellows-shaped: peak height 4.3～12.5mm, the pitch of waves 7.3～10.2mm, the high 100～150mm of dish, bulk density is 200～700kg/m
3, the structured packing that assembles at last towards ripple.This metallic stuffing tower thin plate filler total height is 8～20 meters.The bottoms material passes back into reactor, and the cat head gas-phase product is divided into two-phase through after the refrigerated separation, and the ester phase: a part enters medial launder, and another part passes back in the tower, water: enter wastewater trough.
Embodiment 1:
The component and the weight percent proportioning of the material in the reactor are: acetate 70%, ethanol 28%, water 2%.The filler stainless steel plate trade mark is 304, select by above-mentioned requirements thick, punching and ripple.
It is the esterification column filler that the present invention adopts stainless steel sheet in an embodiment, and this is not a limitation of the present invention, and rights protection of the present invention is as the criterion with claim.
Moving two wheat harvesting periods continuously by said apparatus proves: one, owing to the raising of number of theoretical plate, quality product obviously improves; Two, the resistance of tower reduces, and output of column promotes relatively, stable operation.The operation index and the result of ceramic packing esterification column and Stainless Steel Helices esterification column are as follows:
Embodiment 2:
The component of the material in the reactor and weight percent proportioning are: acetate 30%, ethanol 50%, water 20%.Stainless steel plate trade mark 316L.
Claims (5)
1. production ethyl acetate esterification column Reaction Separation flow process, mixing raw material is thrown in the esterification column reactor, vaporize under steam-heated condition through the solution that carries out esterification behind the sulfuric acid catalysis, form ester, water, alcohol, the azeotropic acid objects system, enter esterification column evaporation rectifying, separate, obtain product, it is characterized in that: the evaporation rectification process of described esterification column, filling metal thin plate structured packing in the tower, the metal sheet structured packing of filling is the stainless steel sheet structured packing in the described esterification column, and 8～20 meters of total heights are loaded in this stainless steel sheet structured packing in described tower.
2. production ethyl acetate esterification column Reaction Separation flow process according to claim 1, it is characterized in that: the rolling ripple of punching on the described metal sheet, thickness of slab is at 0.1～0.5mm, the percentage of open area 5～10% of the rolling ripple of punching, towards ripple peak height 4.3～12.5mm, the pitch of waves 7.3～10.2mm, the high 100～150mm of dish, bulk density is 200～700kg/m
3, make the corrosion thing not enter filler or enter the preseparating structure of the acid of filler less in the installation of the bottom of filler simultaneously.
3. production ethyl acetate esterification column Reaction Separation flow process according to claim 1 is characterized in that: the component and the weight percent proportioning that drop into the material in the esterification column reactor are: acetate 30～70%, ethanol 28～50%, water 2～20%.
4. production ethyl acetate esterification column Reaction Separation flow process according to claim 3 is characterized in that: the component and the weight percent proportioning that drop into the material in the reactor are: acetate 70%, and ethanol 28%, water 2%, the filler stainless steel plate trade mark is 304.
5. production ethyl acetate esterification column Reaction Separation flow process according to claim 3 is characterized in that: the component and the weight percent proportioning that drop into the material in the reactor are: acetate 30%, ethanol 50%, water 20%, filler stainless steel plate trade mark 316L.
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| CNB2004100663415A CN100497291C (en) | 2004-09-14 | 2004-09-14 | Esterification tower reaction separation flow process for producing ethyl acetate |
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| CNB2004100663415A CN100497291C (en) | 2004-09-14 | 2004-09-14 | Esterification tower reaction separation flow process for producing ethyl acetate |
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| CN1616398A CN1616398A (en) | 2005-05-18 |
| CN100497291C true CN100497291C (en) | 2009-06-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101735045A (en) * | 2009-12-18 | 2010-06-16 | 中山大学 | Method for producing ethyl acetate by using entrainer |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357250C (en) * | 2006-01-18 | 2007-12-26 | 华南理工大学 | Ethyl acetate dehydrating extraction method |
| CN101830799B (en) * | 2010-05-25 | 2013-05-08 | 临沂市金沂蒙生物科技有限公司 | Single-tower rectifying method for synthetizing ethyl acetate by esterification method |
| CN103951544B (en) * | 2014-05-19 | 2015-06-10 | 临沂市巅峰化工技术有限公司 | Method for separating ethyl acetate and ethanol azeotrope by differential pressure rectification |
| CN103936586A (en) * | 2014-05-19 | 2014-07-23 | 临沂市巅峰化工技术有限公司 | Production method of ethyl acetate |
-
2004
- 2004-09-14 CN CNB2004100663415A patent/CN100497291C/en active Active
Non-Patent Citations (2)
| Title |
|---|
| 对乙酸乙酯生产设备与工艺的改造. 翟建华等人.河北轻化工学院学报，第17卷第1期. 1996 |
| 对乙酸乙酯生产设备与工艺的改造. 翟建华等人.河北轻化工学院学报，第17卷第1期. 1996 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101735045A (en) * | 2009-12-18 | 2010-06-16 | 中山大学 | Method for producing ethyl acetate by using entrainer |
| CN101735045B (en) * | 2009-12-18 | 2013-11-06 | 中山大学 | Method for producing ethyl acetate by using entrainer |
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| CN1616398A (en) | 2005-05-18 |
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Owner name: SHANGHAI HUAYI ENERGY + CHEMICAL INDUSTRY CO., LTD Free format text: FORMER OWNER: WUJING CHEMICAL CO., LTD., SHANGHAI Effective date: 20150119 |
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Effective date of registration: 20150119 Address after: 200241 Minhang District, Wu Long Road, No. 4280, Shanghai Patentee after: Shanghai Hua Yi derived energy chemical Co., Ltd Address before: 200241 No. 4600, Wu Long Road, Shanghai, Minhang District Patentee before: Wujing Chemical Co., Ltd., Shanghai |