CN110975315A - Energy-saving rectification purification system for high-purity propylene oxide - Google Patents
Energy-saving rectification purification system for high-purity propylene oxide Download PDFInfo
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- CN110975315A CN110975315A CN201911249091.1A CN201911249091A CN110975315A CN 110975315 A CN110975315 A CN 110975315A CN 201911249091 A CN201911249091 A CN 201911249091A CN 110975315 A CN110975315 A CN 110975315A
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- boiling tower
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- propylene oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D301/00—Preparation of oxiranes
- C07D301/32—Separation; Purification
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
- C07D303/02—Compounds containing oxirane rings
- C07D303/04—Compounds containing oxirane rings containing only hydrogen and carbon atoms in addition to the ring oxygen atoms
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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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- 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
- Y02P20/50—Improvements relating to the production of bulk chemicals
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Epoxy Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to an energy-saving rectification and purification system for high-purity propylene oxide, wherein a crude propylene oxide inlet is formed in the middle of a high-boiling tower, a first compressor and a first heat exchanger are sequentially connected with a steam outlet at the top of the high-boiling tower, the first heat exchanger is connected with a cold material heat exchange pipeline at the bottom of the high-boiling tower, a steam outlet pipeline of the first heat exchanger is sequentially connected with a first throttling valve and a first phase splitter and then respectively connected with a first reflux port of the high-boiling tower and a material inlet of a low-boiling tower, a steam outlet of the low-boiling tower is sequentially connected with a second compression heat exchanger and a second heat exchanger, the second heat exchanger is connected with a cold material heat exchange pipeline at the bottom of the low-boiling tower, and a steam outlet of the second heat exchanger is sequentially connected with a second throttling valve and a second phase splitter and then. The energy-saving rectification and purification system for high-purity propylene oxide can realize direct purification, avoid the use of an extracting agent, reduce the addition of extra elements in the rectification system, fully utilize the heat in the rectification process and reduce the carbon emission.
Description
Technical Field
The invention belongs to the technical field of rectification and purification of propylene oxide, and particularly relates to an energy-saving rectification and purification system for high-purity propylene oxide.
Background
With the vigorous development of the domestic propylene oxide market, the requirements on the production process of propylene oxide are higher and higher, the current industry adopts more chlorohydrin production, the method has serious pollution to the environment, and the new production line is forbidden at present. At present, the promotion of a clean and green HPPO method for industrial upgrading is urgently needed. The current HPPO method has certain defects, and particularly has the following defects in the rectification stage with high energy consumption and high waste in the whole production process: (1) chemical impurity removing method is adopted. By adding hydrazine water and a basic solvent. The solvent after purification is difficult to recycle. (2) Methylal is generated in methanol circulating in the process due to the existence of an extracting agent, so that the energy consumption of the rectification process of catalyst poisoning (3) is huge, the rectification process is rarely recycled, and the waste is serious.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an energy-saving rectification and purification system for high-purity propylene oxide, which is suitable for pilot plant and continuous technical production.
The technical problem to be solved by the invention is realized by the following technical scheme:
an energy-saving rectification purification system of high-purity propylene oxide is characterized in that: comprises a high-boiling tower, a low-boiling tower, a first compressor, a second compressor, a first throttle valve, a second throttle valve and a first heat exchanger, the system comprises a second heat exchanger, a first phase splitter and a second phase splitter, wherein a crude epoxypropane inlet is formed in the middle of a high-boiling tower, a first compressor and a first heat exchanger are sequentially connected with a steam outlet at the top of the high-boiling tower, the first heat exchanger is connected with a cold material heat exchange pipeline at the bottom of the high-boiling tower, a first throttling valve is sequentially connected with a steam outlet pipeline of the first heat exchanger, the first throttling valve is connected with a first reflux port of the high-boiling tower and a material inlet of the low-boiling tower after the first phase splitter, a second compression heat exchanger is sequentially connected with a steam outlet of the low-boiling tower, the second heat exchanger is connected with a cold material heat exchange pipeline at the bottom of the low-boiling tower, and a second throttling valve is sequentially connected with a steam outlet of the second heat exchanger, and the second phase splitter is.
Moreover, the high-boiling tower and the low-boiling tower are both plate rectifying towers.
And the tower top of the high-boiling tower is 41 ℃, 1.3bar, the tower bottom is 52 ℃, 1.4bar, the reflux ratio is 1.97, and the materials at the tower top are propylene oxide with the mass fraction of about 99.9 wt%, acetaldehyde with the mass fraction of 0.09% and other small impurities.
Moreover, the temperature of the top of the low-boiling tower is 36 ℃, 1.1bar, the temperature of the bottom of the low-boiling tower is 42 ℃, 1.3bar, the reflux ratio is 35, and the purity of the product epoxypropane at the bottom of the low-boiling tower can reach 99.97 wt%.
The invention has the advantages and beneficial effects that:
1. the energy-saving rectification and purification system of the high-purity propylene oxide adopts a double-tower rectification system, adopts two plate-type rectification towers to sequentially carry out rectification and purification operations on the propylene oxide according to the characteristics that various substances in crude propylene oxide have different boiling points and almost do not generate azeotropy, firstly leads the propylene oxide into a high-boiling tower to carry out impurity removal operations on high-boiling substances such as water, methanol and the like, and adjusts parameters such as proper reflux ratio, tower plate number and the like to ensure that the impurity content of the high-boiling substances in a light component meets the requirement; and introducing the material at the top of the high-boiling tower into a low-boiling tower, selecting proper parameters in the low-boiling tower, removing impurities of low-boiling substances such as acetaldehyde, purifying propylene oxide with purity meeting the industrial requirement by double-tower operation, and further purifying the residual impurities after purification for recycling.
2. The invention relates to an energy-saving rectification and purification system of high-purity propylene oxide, which realizes the recycling of heat through a rectification tower and a Mechanical Vapor Recompression (MVR) technology, wherein a compressor, a heat exchanger, a throttle valve, a phase splitter and other components are added on the rectification tower to form the mechanical vapor recompression system, hot vapor at the tower top passes through the compressor, the vapor at a low temperature position is compressed through the compressor, the temperature and the pressure are improved, the enthalpy is increased, then the hot vapor is introduced into the heat exchanger at the tower bottom to exchange heat with materials in a tower kettle, the heating of the tower kettle is realized, the cooling of the tower top is also finished, the hot vapor coming out of the heat exchanger passes through the throttle valve, the phase splitting reflux is carried out in the phase splitter, one part is refluxed to ensure the purity of products at the tower top, and the other part is introduced into a low-boiling tower to.
3. The energy-saving rectification and purification system for high-purity propylene oxide can realize direct purification of propylene oxide, avoids the use of an extracting agent, reduces the addition of extra elements in the rectification system, fully utilizes the heat in the rectification process, reduces carbon emission and reduces the operation cost of engineering.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Description of the reference numerals
1-high boiling tower, 2-first compressor, 3-first phase separator, 4-first throttle valve, 5-first heat exchanger, 6-low boiling tower, 7-second compressor, 8-second phase separator, 9-second throttle valve and 10-second heat exchanger.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
An energy-saving rectification and purification system for high-purity propylene oxide comprises a high-boiling tower 1, a low-boiling tower 6, a first compressor 2, a second compressor 7, a first throttling valve 4, a second throttling valve 9, a first heat exchanger 5, a second heat exchanger 10, a first phase separator 3 and a second phase separator 8, wherein the high-boiling tower and the low-boiling tower are plate-type rectification towers.
The middle part of the high-boiling tower is provided with a crude epoxypropane inlet, a steam outlet at the top of the high-boiling tower is sequentially connected with a first compressor and a first heat exchanger, an outlet of the first heat exchanger is sequentially connected with a first throttling valve and a first phase splitter and then respectively connected with a first reflux port of the high-boiling tower and a material inlet of the low-boiling tower, a steam outlet of the low-boiling tower is sequentially connected with a second compression device and a second heat exchanger, and an outlet of the second heat exchanger is sequentially connected with a second throttling valve and a second phase splitter and then respectively connected with a reflux port of the low-boiling tower and a reflux port of the high-boiling second tower.
Crude propylene oxide is introduced from a material inlet in the middle of a high-boiling tower, steam at the top of the high-boiling tower is compressed by a first compressor, the high-temperature high-pressure gas is introduced into the tower bottom in a high-temperature high-pressure gas form, the first heat exchanger exchanges heat with cold materials at the bottom of the tower to heat the materials at the bottom of the tower, one part of the steam after heat exchange is refluxed after being throttled by a first throttle valve, the other part of the steam is introduced into a low-boiling tower to be continuously rectified, the steam at the top of the low-boiling tower exchanges heat with the cold materials at the bottom of the low-boiling tower through a second compressor and a second heat exchanger to heat the materials at the bottom of the tower, the steam after heat exchange passes through a second throttle valve, the second heat exchanger, part of the steam after heat exchange flows back to the.
Crude propylene oxide is introduced into a material inlet of the high-boiling tower, wherein the concentration of the propylene oxide is about 98%, the crude propylene oxide also comprises about 1.6% of water, 0.084% of acetaldehyde, 0.04% of methanol and other small amount of impurities such as methyl formate, propionaldehyde and the like, the crude propylene oxide is rectified in the high-boiling tower, the temperature of the tower top is about 41 ℃, 1.3bar, the temperature of the tower bottom is about 52 ℃, 1.4bar and the reflux ratio is 1.97, and the tower top material is obtained and comprises about 99.9 wt% of propylene oxide, 0.09% of acetaldehyde and other small amount of impurities. And introducing the mixture into a low-boiling tower for further purification, wherein the temperature at the top of the tower is about 36 ℃, 1.1bar, the temperature at the bottom of the tower is about 42 ℃, 1.3bar and the reflux ratio is 35, and the purity of the propylene oxide product at the bottom of the low-boiling tower can reach 99.97 wt%, so that the propylene oxide product meets the requirements of practical industrial application.
Although the embodiments of the present invention and the accompanying drawings have been disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, alterations, and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and thus the scope of the invention is not limited to the embodiments and drawings disclosed.
Claims (4)
1. An energy-saving rectification purification system of high-purity propylene oxide is characterized in that: comprises a high-boiling tower, a low-boiling tower, a first compressor, a second compressor, a first throttle valve, a second throttle valve and a first heat exchanger, the system comprises a second heat exchanger, a first phase splitter and a second phase splitter, wherein a crude epoxypropane inlet is formed in the middle of a high-boiling tower, a first compressor and a first heat exchanger are sequentially connected with a steam outlet at the top of the high-boiling tower, the first heat exchanger is connected with a cold material heat exchange pipeline at the bottom of the high-boiling tower, a first throttling valve is sequentially connected with a steam outlet pipeline of the first heat exchanger, the first throttling valve is connected with a first reflux port of the high-boiling tower and a material inlet of the low-boiling tower after the first phase splitter, a second compression heat exchanger is sequentially connected with a steam outlet of the low-boiling tower, the second heat exchanger is connected with a cold material heat exchange pipeline at the bottom of the low-boiling tower, and a second throttling valve is sequentially connected with a steam outlet of the second heat exchanger, and the second phase splitter is.
2. The energy-saving rectification purification system for high-purity propylene oxide according to claim 1, characterized in that: the high-boiling tower and the low-boiling tower are both plate rectifying towers.
3. The energy-saving rectification purification system for high-purity propylene oxide according to claim 1, characterized in that: the top of the high boiling tower is 41 ℃, 1.3bar, the bottom of the high boiling tower is 52 ℃, 1.4bar, the reflux ratio is 1.97, and the obtained materials at the top of the high boiling tower are epoxypropane with the mass fraction of about 99.9 wt%, acetaldehyde with the mass fraction of 0.09% and other small amount impurities.
4. The energy-saving rectification purification system for high-purity propylene oxide according to claim 1, characterized in that: the temperature of the top of the low-boiling tower is 36 ℃, 1.1bar, the temperature of the bottom of the low-boiling tower is 42 ℃, 1.3bar, the reflux ratio is 35, and the purity of the product epoxypropane at the bottom of the low-boiling tower can reach 99.97 wt%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911249091.1A CN110975315A (en) | 2019-12-09 | 2019-12-09 | Energy-saving rectification purification system for high-purity propylene oxide |
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| CN201911249091.1A CN110975315A (en) | 2019-12-09 | 2019-12-09 | Energy-saving rectification purification system for high-purity propylene oxide |
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| CN110975315A true CN110975315A (en) | 2020-04-10 |
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| CN201911249091.1A Pending CN110975315A (en) | 2019-12-09 | 2019-12-09 | Energy-saving rectification purification system for high-purity propylene oxide |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115253350A (en) * | 2022-08-05 | 2022-11-01 | 淄博万华机械设备有限公司 | Double-tower MVR continuous distillation recovery system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5599955A (en) * | 1996-02-22 | 1997-02-04 | Uop | Process for producing propylene oxide |
| CN102442980A (en) * | 2010-10-11 | 2012-05-09 | 中国石油化工股份有限公司 | Purification method of epoxy propane crude product and epoxy propane preparation method |
| CN102942539A (en) * | 2012-11-09 | 2013-02-27 | 南阳中聚天冠低碳科技有限公司 | Epoxy propane recovery and purification process |
| CN202983250U (en) * | 2012-11-09 | 2013-06-12 | 南阳中聚天冠低碳科技有限公司 | Epoxy propane recovering and purifying device |
| CN109675334A (en) * | 2019-01-22 | 2019-04-26 | 天津乐科节能科技有限公司 | Potassium tert-butoxide directly connects compression from backheat distillation system and method |
-
2019
- 2019-12-09 CN CN201911249091.1A patent/CN110975315A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5599955A (en) * | 1996-02-22 | 1997-02-04 | Uop | Process for producing propylene oxide |
| CN102442980A (en) * | 2010-10-11 | 2012-05-09 | 中国石油化工股份有限公司 | Purification method of epoxy propane crude product and epoxy propane preparation method |
| CN102942539A (en) * | 2012-11-09 | 2013-02-27 | 南阳中聚天冠低碳科技有限公司 | Epoxy propane recovery and purification process |
| CN202983250U (en) * | 2012-11-09 | 2013-06-12 | 南阳中聚天冠低碳科技有限公司 | Epoxy propane recovering and purifying device |
| CN109675334A (en) * | 2019-01-22 | 2019-04-26 | 天津乐科节能科技有限公司 | Potassium tert-butoxide directly connects compression from backheat distillation system and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115253350A (en) * | 2022-08-05 | 2022-11-01 | 淄博万华机械设备有限公司 | Double-tower MVR continuous distillation recovery system and method |
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Application publication date: 20200410 |