CN105152844A - Method for preparing isobutylene from tert-butyl alcohol - Google Patents
Method for preparing isobutylene from tert-butyl alcohol Download PDFInfo
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- CN105152844A CN105152844A CN201510506139.8A CN201510506139A CN105152844A CN 105152844 A CN105152844 A CN 105152844A CN 201510506139 A CN201510506139 A CN 201510506139A CN 105152844 A CN105152844 A CN 105152844A
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- trimethyl carbinol
- slurry
- rectifying tower
- butylene
- iso
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- 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
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Abstract
The invention applies to the technical field of preparation of isobutylene and provides a method for preparing isobutylene from tert-butyl alcohol. According to the method, slurry is prepared from deionized water and a catalyst in a slurry mixer and is pumped into a catalytic distillation column and has a dehydration reaction with tert-butyl alcohol as the raw material, a material discharged from the bottom of the catalytic distillation column is a mixture of small amount of tert-butyl alcohol, water and the catalyst, the mixture is circulated back to the slurry mixer, an overhead product is condensed by a condenser and enters a reflux tank, part of the overhead product flows back to the catalytic distillation column, part of the overhead product is pumped into a purification distillation column, and high-purity isobutylene id distilled out of the top of the purification distillation column. On the basis, the method adopts slurry catalytic distillation, the efficiency of the catalyst is improved, catalytic elements are not needed to be manufactured, the catalytic distillation equipment is simplified, catalyst replacement without shutdown is realized, and the production efficiency is improved.
Description
Technical field
The present invention relates to iso-butylene preparing technical field, particularly relate to a kind of method that trimethyl carbinol prepares iso-butylene.
Background technology
At present, ion exchange process is utilized to mainly contain two kinds by the method for tert-butyl alcohol dehydration preparing isobutene, one is under the catalyst actions such as sulfonic acid ion exchange resin, in fixed-bed reactor, dehydration generates iso-butylene, because per pass conversion is low, often adopt the mode of plural parallel stage or series connection, equipment is many and complicated, energy consumption is also corresponding higher, needs to stop to change after catalyst failure; Another kind fills sulfonic acid ion exchange resin in rectifying tower, and make rectifying tower form multi-segment structure and realize tert-butyl alcohol dehydration reaction, rectifying tower structure is complicated, wayward, needs to stop to change after catalyst failure.
In summary, obviously there is inconvenience and defect in actual use in prior art, so be necessary to be improved.
Summary of the invention
For above-mentioned defect, the object of the present invention is to provide a kind of trimethyl carbinol to prepare the method for iso-butylene, it can simplify catalytic distillation equipment, achieves the more catalyst changeout that do not stop, thus enhances productivity.
To achieve these goals, the invention provides a kind of method that trimethyl carbinol prepares iso-butylene, deionized water and catalyzer make slurry in slurry mixer, described slurry is squeezed in catalytic rectifying tower by pump, described slurry and trimethyl carbinol raw material carry out dehydration reaction, the discharging of described catalytic rectifying tower tower reactor is a small amount of trimethyl carbinol, water and catalyst mixture, loop back slurry mixer, overhead product enters return tank after condenser condenses, described overhead product is partly refluxed to catalytic rectifying tower, part pumps into purification rectifying tower, described purification rectifying tower tower top distillates high-purity isobutylene.
The trimethyl carbinol according to the present invention prepares the method for iso-butylene, and described catalyzer is sulfonic acid ion exchange resin particulate or ultrafine particle.
The trimethyl carbinol according to the present invention prepares the method for iso-butylene, and described catalytic rectifying tower working pressure is 0.1 ~ 0.25MPa, and temperature controls at 80 ° ~ 150 °.
The trimethyl carbinol according to the present invention prepares the method for iso-butylene, and the interpolation concentration of described catalyzer controls at 20Kg/m
3~ 39Kg/m
3.
The trimethyl carbinol according to the present invention prepares the method for iso-butylene, it is characterized in that, described overhead product control of reflux ratio is 1.2 ~ 1.8.
The present invention realizes catalytic distillation by ion exchange resin is made slurry, with conventional distillation technique, there is outstanding feature: without the need to making catalyzer original paper, simplify catalytic distillation equipment, achieve the more catalyst changeout that do not stop, catalyst efficiency is high, be easy to suitability for industrialized production, there is the prospect of further research and development.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
In figure, a-ionized water, b-catalyzer, the c-trimethyl carbinol, e-iso-butylene, 1-slurry mixer, 2-catalytic rectifying tower, 3-condenser, 4-return tank, 5-purification rectifying tower, 6-condenser, 7-return tank.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
See Fig. 1, the invention provides a kind of method that trimethyl carbinol prepares iso-butylene, deionized water and catalyzer are incorporated in slurry mixer 1, evenly make slurry by magnetic stirrer, squeeze in catalytic rectifying tower 2 by pump; Slurry flows fully in catalytic rectifying tower 2 and trimethyl carbinol contact raw catalysis tert-butyl alcohol dehydration reacts.After dehydration reaction, the discharging of catalysis tower reactor is a small amount of trimethyl carbinol, water and catalyst mixture, loops back slurry mixer 1, recycle through recycle pump.Overhead product is thick iso-butylene, enters return tank 4, be partly refluxed to catalytic rectifying tower 2 after condenser 6 condensation, and part pumps into purification rectifying tower 5, and purification rectifying tower 5 tower top distillates high-purity isobutylene.
Preferably, catalyzer of the present invention is the strong acid ion exchange resin particulate or ultrafine particle that particle diameter is very little, forms slurry with liquid phase, flows in catalytic rectifying tower 2, and catalytic efficiency improves.
Further, catalytic rectifying tower 2 working pressure of the present invention is 0.1 ~ 0.25MPa, and temperature controls at 80 ° ~ 150 °, when pressure is raised to 0.25MPa by 0.1MPa, trimethyl carbinol transformation efficiency slightly improves, but when pressure is more than 0.25MPa, raise with pressure, trimethyl carbinol transformation efficiency reduces gradually.
Further, the interpolation concentration of catalyzer of the present invention controls at 20Kg/m
3~ 39Kg/m
3, practice result shows the increase along with catalyst concn in charging, and the transformation efficiency of the trimethyl carbinol raises gradually, when concentration is higher than 20Kg/m
3time, trimethyl carbinol transformation efficiency is higher than 95%, and special concentration of working as reaches 39Kg/m
3time, trimethyl carbinol transformation efficiency can reach 99%.
Better, overhead product reflux ratio 1.2 ~ 1.8 of the present invention, facts have proved the increase along with reflux ratio, and the transformation efficiency of the trimethyl carbinol raises gradually, but becomes downtrending after 1.5, and simultaneously for reducing energy consumption, rational reflux ratio should be 1.2 ~ 1.8, preferably 1.5.
In sum, the present invention realizes catalytic distillation by ion exchange resin is made slurry, with conventional distillation technique, there is outstanding feature: without the need to making catalyzer original paper, simplify catalytic distillation equipment, achieve the more catalyst changeout that do not stop, catalyst efficiency is high, is easy to suitability for industrialized production, has the prospect of further research and development.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the present invention.
Claims (5)
1. the trimethyl carbinol prepares the method for iso-butylene, it is characterized in that, deionized water and catalyzer make slurry in slurry mixer, described slurry is squeezed in catalytic rectifying tower by pump, described slurry and trimethyl carbinol raw material carry out dehydration reaction, the discharging of described catalytic rectifying tower tower reactor is a small amount of trimethyl carbinol, water and catalyst mixture, described mixture loops back slurry mixer, overhead product enters return tank after condenser condenses, described overhead product is partly refluxed to catalytic rectifying tower, part pumps into purification rectifying tower, described purification rectifying tower tower top distillates high-purity isobutylene.
2. the trimethyl carbinol according to claim 1 prepares the method for iso-butylene, it is characterized in that, described catalyzer is strong acid ion exchange resin particulate or ultrafine particle.
3. the trimethyl carbinol according to claim 2 prepares the method for iso-butylene, it is characterized in that, described catalytic rectifying tower working pressure is 0.1 ~ 0.25MPa, and temperature controls at 80 ° ~ 150 °.
4. the trimethyl carbinol according to claim 3 prepares the method for iso-butylene, it is characterized in that, the interpolation concentration of described catalyzer controls at 20Kg/m
3~ 39Kg/m
3.
5. the trimethyl carbinol according to claim 4 prepares the method for iso-butylene, it is characterized in that, described overhead product control of reflux ratio is 1.2 ~ 1.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510506139.8A CN105152844A (en) | 2015-08-17 | 2015-08-17 | Method for preparing isobutylene from tert-butyl alcohol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510506139.8A CN105152844A (en) | 2015-08-17 | 2015-08-17 | Method for preparing isobutylene from tert-butyl alcohol |
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| Publication Number | Publication Date |
|---|---|
| CN105152844A true CN105152844A (en) | 2015-12-16 |
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|---|---|---|---|
| CN201510506139.8A Pending CN105152844A (en) | 2015-08-17 | 2015-08-17 | Method for preparing isobutylene from tert-butyl alcohol |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105175210A (en) * | 2015-09-08 | 2015-12-23 | 山东成泰化工有限公司 | Method for preparing isobutylene by tert butyl alcohol |
| CN109096026A (en) * | 2018-08-28 | 2018-12-28 | 宁波昊德化学工业股份有限公司 | A kind of production method of isobutene |
| CN110776389A (en) * | 2019-11-29 | 2020-02-11 | 万华化学集团股份有限公司 | Compound catalyst and method for preparing styrene |
| CN111187137A (en) * | 2020-02-13 | 2020-05-22 | 浙江信汇新材料股份有限公司 | Process for preparing polymer-grade isobutene from TBA |
| CN112094192A (en) * | 2019-06-18 | 2020-12-18 | 天津华信化工技术有限公司 | Novel method for preparing dimethyl carbonate by catalytic reaction and rectification of slurry |
-
2015
- 2015-08-17 CN CN201510506139.8A patent/CN105152844A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 王艳飞等: "叔丁醇催化精馏脱水制高纯度异丁烯中试研究", 《应用化工》 * |
| 薛艳等: "浆料催化精馏新工艺制异丁烯", 《化学工业与工程》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105175210A (en) * | 2015-09-08 | 2015-12-23 | 山东成泰化工有限公司 | Method for preparing isobutylene by tert butyl alcohol |
| CN109096026A (en) * | 2018-08-28 | 2018-12-28 | 宁波昊德化学工业股份有限公司 | A kind of production method of isobutene |
| CN109096026B (en) * | 2018-08-28 | 2021-07-06 | 宁波昊德化学工业股份有限公司 | Production method of isobutene |
| CN112094192A (en) * | 2019-06-18 | 2020-12-18 | 天津华信化工技术有限公司 | Novel method for preparing dimethyl carbonate by catalytic reaction and rectification of slurry |
| CN110776389A (en) * | 2019-11-29 | 2020-02-11 | 万华化学集团股份有限公司 | Compound catalyst and method for preparing styrene |
| CN110776389B (en) * | 2019-11-29 | 2022-08-05 | 万华化学集团股份有限公司 | Compound catalyst and method for preparing styrene |
| CN111187137A (en) * | 2020-02-13 | 2020-05-22 | 浙江信汇新材料股份有限公司 | Process for preparing polymer-grade isobutene from TBA |
| CN111187137B (en) * | 2020-02-13 | 2024-02-09 | 浙江信汇新材料股份有限公司 | Process for preparing polymeric isobutene by TBA |
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