CN210855898U - System for recovering energy in process of producing epoxypropane by HPPO method - Google Patents
System for recovering energy in process of producing epoxypropane by HPPO method Download PDFInfo
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- CN210855898U CN210855898U CN201921861976.2U CN201921861976U CN210855898U CN 210855898 U CN210855898 U CN 210855898U CN 201921861976 U CN201921861976 U CN 201921861976U CN 210855898 U CN210855898 U CN 210855898U
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- propylene oxide
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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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Abstract
The utility model provides a system for recovering energy in the process of producing propylene oxide by HPPO method, which comprises a solvent recovery unit, a propylene recovery unit and a propylene oxide separation unit; the solvent recovery unit comprises at least two stages of solvent recovery rectifying towers which are connected in series; the propylene recovery unit comprises at least two stages of propylene recovery rectifying towers which are connected in series; the propylene oxide separation unit comprises at least two stages of propylene oxide separation and rectification towers which are connected in series; and a discharge port at the top of the first-stage solvent recovery rectifying tower of the solvent recovery unit is respectively and independently connected with a tower kettle reboiler of the propylene recovery rectifying tower and a tower kettle reboiler of the propylene oxide separation rectifying tower. The utility model realizes the step utilization of high grade heat source by changing the heat source of the reboiler of the tower kettle of the rectifying tower; the cooling load at the top of the rectifying tower during solvent recovery is reduced; reduces the energy consumption in the production process of the propylene oxide and reduces the production cost.
Description
Technical Field
The utility model belongs to the technical field of it is energy-conserving, a energy recuperation system is related to, especially relate to a system for retrieving propylene oxide in-process energy of HPPO method production.
Background
Propylene Oxide (PO) is an important basic organic chemical raw material, the PO is mainly used for producing polyether, propylene glycol and isopropanolamine, and can also be used as a main raw material of a surfactant, a demulsifier and a pesticide emulsifier, and derivatives of the PO are widely applied to industries such as automobiles, buildings, food, tobacco, cosmetics and the like and are important raw materials of fine chemical products.
At present, methods for producing PO comprise a chlorohydrin method, an oxidation method and a hydrogen peroxide oxidation method (HPPO method), wherein the HPPO method is a novel propylene oxide production method, the method can overcome the defects of serious corrosion of the chlorohydrin method to equipment, more waste liquid and more waste residues, and the method does not have the defects of more co-oxidation method coproducts, and is an internationally recognized environment-friendly production method at present. The method has the advantages of simple process, high product yield, no pollution and high byproduct value.
The production of propylene oxide by the HPPO method is a process of generating propylene oxide by the direct oxidation reaction of propylene and hydrogen peroxide in the presence of a circulating solvent. In the reaction process, hydrogen peroxide is completely converted, propylene is excessive, the reaction product contains propylene, epoxypropane, a circulating solvent and water, the operations of propylene recovery and cyclic utilization, epoxypropane purification, circulating solvent purification and the like are required to be sequentially carried out on the reaction product, the operations of separating and recovering the reaction product in a rectifying tower are required, the steam consumption is large, and the energy consumption is high.
CN 206033636U discloses equipment of deamination and recovery epoxypropane, propylene in epoxypropane device, including deamination adsorption tower, PO rectifying column, condenser, reboiler, propylene recovery tower, tail gas treatment tower and cooler. The reboiler uses an external heat source to provide heat, needs to consume a large amount of steam, has high energy consumption, and does not recover excessive steam heat.
CN 103788026 a discloses a method for refining propylene oxide, comprising: sending a solution containing propylene oxide, an organic solvent and water into a propylene oxide separation and refining unit for separation to obtain a propylene oxide product and an organic solvent aqueous solution, wherein the boiling point of the organic solvent is lower than that of water; and (3) sending the organic solvent aqueous solution into a multi-effect evaporation system of a plurality of tower separators to recover the organic solvent. However, the method only recycles the heat of the organic steam in the first-stage tower separator, and the energy recovery is limited.
Therefore, the system for recovering the energy in the process of producing the propylene oxide by the HPPO method is provided, the heat source of the reboiler in the device for producing the propylene oxide by the HPPO method is improved, the cold load at the top of the solvent recovery tower is reduced, the gradient utilization of the energy is realized, the consumption of an external heat source is saved, and the production cost is reduced.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a system for recovering energy in the process of producing epoxypropane by an HPPO method, which improves the system for producing epoxypropane by the HPPO method in the prior art, changes the heat source of a reboiler of a tower kettle of a rectifying tower and realizes the cascade utilization of a high-grade heat source; the cooling load of the top of the rectifying tower during solvent recovery is reduced; the utility model provides a system for retrieve propylene oxide in-process energy of HPPO method production has reduced the energy consumption in the propylene oxide production process, has reduced manufacturing cost.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a system for retrieve propylene oxide in-process energy of HPPO method production, the system of retrieving propylene oxide in-process energy of HPPO method production includes solvent recovery unit, propylene recovery unit and propylene oxide isolated cell.
The solvent recovery unit comprises at least two stages of solvent recovery rectifying towers which are connected in series; the propylene recovery unit comprises at least two stages of propylene recovery rectifying towers which are connected in series; the propylene oxide separation unit comprises at least two stages of propylene oxide separation and rectification towers which are connected in series.
And a discharge port at the top of the first-stage solvent recovery rectifying tower of the solvent recovery unit is respectively and independently connected with a tower kettle reboiler of the propylene recovery rectifying tower and a tower kettle reboiler of the propylene oxide separation rectifying tower.
The reaction product of the propylene oxide produced by the HPPO method contains propylene, propylene oxide, solvent and water, so the solvent recovery unit for producing propylene oxide by the HPPO method is used for rectifying and recovering the solvent in the reaction product. The propylene recovery unit is used for rectifying and recovering propylene in the reaction product. The propylene oxide separation unit is used for rectifying and separating a reaction product after propylene is recovered to obtain a propylene oxide product. The solvent recovery unit is used for recovering and reusing the solvent.
The tower top steam of the solvent recovery rectifying tower in the solvent recovery unit has higher temperature and higher energy grade, and the tower top steam of the solvent recovery unit is respectively and independently used as the heat source of the tower kettle reboiler of the propylene recovery unit and the tower kettle reboiler of the propylene oxide separation unit, so that the tower top cold load of the solvent recovery rectifying tower in the solvent recovery unit can be reduced, the high-grade energy gradient utilization in the solvent recovery unit can be realized, and the production cost of the propylene oxide is reduced.
Preferably, the solvent recovery unit comprises 2-4 stages of solvent recovery rectifying towers connected in series, and a tower top discharge port of the next stage of solvent recovery rectifying tower is connected with a tower kettle reboiler of the previous stage of solvent recovery rectifying tower.
Preferably, the discharge port at the top of the next-stage solvent recovery rectifying tower is connected with the reboiler at the bottom of the previous-stage solvent recovery rectifying tower and then connected with the top reflux tank of the next-stage solvent recovery rectifying tower.
Preferably, a tower kettle reboiler of the last stage solvent recovery rectifying tower is connected with an external heat supply device.
The external heat supply device provides an external heat source for the tower kettle reboiler of the last stage solvent recovery rectifying tower, the external heat source comprises but is not limited to heat conduction oil and/or high-pressure steam, in order to enable the heat provided by the external heat source to meet the requirement of the solvent recovery tower reboiler, the gauge pressure of the external heat source is 0.1-2.0MPa, and the temperature is 150-300 ℃; at the moment, the tower top steam gauge pressure of the last stage solvent recovery rectifying tower is 0.5-1MPa, and the temperature is 120-180 ℃; the tower top steam gauge pressure of the first-stage solvent recovery rectifying tower is 0.25-0.5MPa, and the temperature is 90-150 ℃.
Preferably, the solvent recovery unit comprises 2 stages of solvent recovery rectification columns connected in series; a discharge port at the top of the 2 nd-level solvent recovery rectifying tower is connected with a reboiler at the bottom of the 1 st-level solvent recovery rectifying tower and then connected with a reflux tank at the top of the 2 nd-level solvent recovery rectifying tower; the discharge port at the top of the 1 st-stage solvent recovery rectifying tower is respectively and independently connected with the tower kettle reboiler of the propylene recovery rectifying tower and the tower kettle reboiler of the propylene oxide separation rectifying tower.
Preferably, the propylene recovery unit comprises 2-4 stages of propylene recovery rectification columns connected in series; further preferably, the propylene recovery unit comprises 2 stages of propylene oxide separation and rectification columns connected in series.
Preferably, the propylene oxide separation unit comprises 2-4 stages of propylene oxide separation and rectification columns connected in series.
Preferably, the top discharge port of the 1 st-stage solvent recovery rectifying tower is respectively and independently connected with the tower bottom reboiler of the propylene recovery rectifying tower and the tower bottom reboiler of the propylene oxide separation rectifying tower, and then connected with the top reflux tank of the 1 st-stage solvent recovery rectifying tower.
The system refers to an equipment system, or a production equipment.
As the utility model discloses a retrieve preferred technical scheme of system of HPPO method production epoxypropane in-process energy, retrieve the system of HPPO method production epoxypropane in-process energy and include solvent recovery unit, propylene recovery unit and epoxypropane separating element.
The propylene recovery unit comprises 2 stages of propylene recovery rectifying towers connected in series, and the propylene oxide separation unit comprises 2 stages of propylene oxide separation rectifying towers connected in series.
The solvent recovery unit comprises 2 stages of solvent recovery rectifying towers connected in series, and a discharge port at the top of the 2 nd stage of solvent recovery rectifying tower is connected with a reboiler at the bottom of the 1 st stage of solvent recovery rectifying tower and then connected with a reflux tank at the top of the 2 nd stage of solvent recovery rectifying tower; the top discharge port of the 1 st level solvent recovery rectifying tower is respectively and independently connected with a tower kettle reboiler of the propylene recovery rectifying tower and a tower kettle reboiler of the epoxypropane separation rectifying tower, and then is connected with a top reflux tank of the 1 st level solvent recovery rectifying tower.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model realizes the step utilization of high grade heat source by changing the heat source of the reboiler of the tower kettle of the rectifying tower; the cooling load at the top of the rectifying tower during solvent recovery is reduced; reduces the energy consumption in the production process of the propylene oxide and reduces the production cost.
Drawings
FIG. 1 is the system for recovering energy in the process of producing propylene oxide by HPPO method provided by the utility model.
Wherein: 1-1, a 1 st-stage solvent recovery rectifying tower; 1-2, a 1 st stage overhead reflux tank; 2-1, a 2 nd-stage solvent recovery rectifying tower; 2-2, a 2 nd stage overhead reflux tank; 3-1, a 1 st-stage propylene recovery rectifying tower; 3-2, a 2 nd stage propylene recovery rectifying tower; 4-1, a 1 st-stage propylene oxide separation rectifying tower; 4-2, a 2 nd stage propylene oxide separation rectifying tower.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Example 1
The utility model provides a system for retrieve propylene oxide in-process energy of HPPO method production, the schematic structure is as shown in figure 1, including solvent recovery unit, propylene recovery unit and propylene oxide separating element.
The 1 st-stage propylene recovery rectifying tower 3-1 and the 2 nd-stage propylene recovery rectifying tower 3-2 are connected in series with the propylene recovery unit; the propylene oxide separation unit comprises a 1 st-stage propylene oxide separation rectifying tower 4-1 and a 2 nd-stage propylene oxide separation rectifying tower 4-2.
The solvent recovery unit comprises a 1 st-stage solvent recovery rectifying tower 1-1 and a 2 nd-stage solvent recovery rectifying tower 2-1 which are connected in series, wherein a tower top discharge hole of the 2 nd-stage solvent recovery rectifying tower 2-1 is connected with a tower kettle reboiler of the 1 st-stage solvent recovery rectifying tower 1-1 and then is connected with a 2 nd-stage tower top reflux tank 2-2 of the 2 nd-stage solvent recovery rectifying tower 2-1; the top discharge port of the 1 st level solvent recovery rectifying tower 1-1 is respectively and independently connected with the tower kettle reboilers of the 1 st level propylene recovery rectifying tower 3-1, the 2 nd level propylene recovery rectifying tower 3-2, the 1 st level propylene oxide separation rectifying tower 4-1 and the 2 nd level propylene oxide separation rectifying tower 4-2, and then is connected with the 1 st level top reflux tank 1-2 of the 1 st level solvent recovery rectifying tower 1-1.
The operation of recovering energy by using the system for recovering energy in the process of producing propylene oxide by using the HPPO method provided in the embodiment 1 is as follows:
(1) an external heat source with gauge pressure of 0.1-2.0MPa and temperature of 150-;
(2) providing heat for a tower kettle reboiler of the 1 st-stage solvent recovery rectifying tower 1-1 by using tower top steam of the 2 nd-stage solvent recovery rectifying tower 2-1, enabling the tower top steam of the 2 nd-stage solvent recovery rectifying tower 2-1 after cooling to flow into a 2 nd-stage tower top recovery tank, enabling a part of condensed solvent to flow back to the 2 nd-stage solvent recovery rectifying tower 2-1, wherein the gauge pressure of the tower top steam in the 1 st-stage solvent recovery rectifying tower 1-1 is 0.25-0.5MPa, and the temperature is 90-150 ℃;
(3) the tower top steam of the 1 st-stage solvent recovery rectifying tower 1-1 is respectively and independently used as heat sources of tower kettle reboilers of the 1 st-stage propylene recovery rectifying tower 3-1, the 2 nd-stage propylene recovery rectifying tower 3-2, the 1 st-stage propylene oxide separation rectifying tower 4-1 and the 2 nd-stage propylene oxide separation rectifying tower 4-2, the tower top steam of the 1 st-stage solvent recovery rectifying tower 1-1 after heat exchange flows into a 1 st-stage tower top recovery tank, and the partially condensed solvent flows back to the 1 st-stage solvent recovery rectifying tower 1-1.
To sum up, the utility model realizes the cascade utilization of high grade heat source by changing the heat source of the reboiler of the tower kettle of the rectifying tower; the cooling load at the top of the rectifying tower during solvent recovery is reduced; reduces the energy consumption in the production process of the propylene oxide and reduces the production cost. In a system for producing propylene oxide by an HPPO method of 40 ten thousand tons per year, if all of the solvent recovery unit, the propylene recovery unit and the propylene oxide separation unit use an external heat source as a reboiler heat source, the high-pressure steam consumption at a pressure of 1.0MPa per hour and a temperature of 250 ℃ is 87 t/h; if high-pressure steam with gauge pressure of 1.0MPa and temperature of 250 ℃ is used only at the reboiler of the tower kettle of the 2 nd-stage solvent recovery rectifying tower 2-1, the consumption of the high-pressure steam is only 66t/h, and the consumption of the steam is reduced by 24.14 percent.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.
Claims (10)
1. The system for recovering the energy in the process of producing the propylene oxide by the HPPO method is characterized by comprising a solvent recovery unit, a propylene recovery unit and a propylene oxide separation unit;
the solvent recovery unit comprises at least two stages of solvent recovery rectifying towers which are connected in series; the propylene recovery unit comprises at least two stages of propylene recovery rectifying towers which are connected in series; the propylene oxide separation unit comprises at least two stages of propylene oxide separation and rectification towers which are connected in series;
and a discharge port at the top of the first-stage solvent recovery rectifying tower of the solvent recovery unit is respectively and independently connected with a tower kettle reboiler of the propylene recovery rectifying tower and a tower kettle reboiler of the propylene oxide separation rectifying tower.
2. The system for recovering energy in the process of producing propylene oxide by HPPO method according to claim 1, wherein the solvent recovery unit comprises 2-4 stages of solvent recovery rectifying towers connected in series, and the tower top discharge port of the next stage of solvent recovery rectifying tower is connected with the tower kettle reboiler of the previous stage of solvent recovery rectifying tower.
3. The system for recovering energy in the process of producing propylene oxide by using an HPPO method according to claim 2, wherein a discharge port at the top of the next-stage solvent recovery rectifying tower is connected with a reboiler at the bottom of the previous-stage solvent recovery rectifying tower and then connected with a reflux tank at the top of the next-stage solvent recovery rectifying tower.
4. The system for recovering energy in the process of producing propylene oxide by HPPO method according to claim 2 or 3, characterized in that the kettle reboiler of the last stage solvent recovery rectifying tower is connected with an external heat supply device.
5. The system for recovering energy in a process for producing propylene oxide by HPPO according to claim 3, characterized in that the solvent recovery unit comprises 2 stages of solvent recovery rectification columns connected in series; a discharge port at the top of the 2 nd-level solvent recovery rectifying tower is connected with a reboiler at the bottom of the 1 st-level solvent recovery rectifying tower and then connected with a reflux tank at the top of the 2 nd-level solvent recovery rectifying tower; the discharge port at the top of the 1 st-stage solvent recovery rectifying tower is respectively and independently connected with the tower kettle reboiler of the propylene recovery rectifying tower and the tower kettle reboiler of the propylene oxide separation rectifying tower.
6. The system for recovering energy in a process for producing propylene oxide by HPPO according to claim 1, characterized in that the propylene recovery unit comprises 2-4 stages of serially connected propylene recovery rectification columns.
7. A system for recovering energy in a process for producing propylene oxide according to claim 6, characterised in that the propylene recovery unit comprises 2 stages of serially connected propylene recovery rectification columns.
8. The system for recovering energy in a process for producing propylene oxide by an HPPO process according to claim 1, wherein the propylene oxide separation unit comprises 2-4 stages of propylene oxide separation and rectification columns connected in series.
9. A system for recovering energy in a process for producing propylene oxide by an HPPO process according to claim 8, characterized in that the propylene oxide separation unit comprises 2 stages of propylene oxide separation and rectification columns connected in series.
10. The system for recovering energy in the process of producing propylene oxide by using an HPPO method according to claim 5, wherein a discharge port at the top of the 1 st-stage solvent recovery rectifying tower is independently connected with a reboiler at the bottom of the propylene recovery rectifying tower and a reboiler at the bottom of the propylene oxide separation rectifying tower respectively, and then is connected with a reflux tank at the top of the 1 st-stage solvent recovery rectifying tower.
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| CN201921861976.2U CN210855898U (en) | 2019-10-31 | 2019-10-31 | System for recovering energy in process of producing epoxypropane by HPPO method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113968772A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Purification method and apparatus, mixed stream processing method and apparatus, method for producing epoxide, and epoxidation reaction system |
| CN113968829A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Propylene epoxidation method and epoxidation system |
| CN113968831A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Propylene oxide refining method, method for separating propylene oxide stream, method for separating epoxidation reaction product, and method for epoxidizing propylene |
| CN113968830A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Method for separating propylene oxide stream, method for separating epoxidation reaction product, and method for epoxidizing propylene |
-
2019
- 2019-10-31 CN CN201921861976.2U patent/CN210855898U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113968772A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Purification method and apparatus, mixed stream processing method and apparatus, method for producing epoxide, and epoxidation reaction system |
| CN113968829A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Propylene epoxidation method and epoxidation system |
| CN113968831A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Propylene oxide refining method, method for separating propylene oxide stream, method for separating epoxidation reaction product, and method for epoxidizing propylene |
| CN113968830A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Method for separating propylene oxide stream, method for separating epoxidation reaction product, and method for epoxidizing propylene |
| CN113968830B (en) * | 2020-07-24 | 2024-01-09 | 中国石油化工股份有限公司 | Separation method of epoxypropane stream and separation method of epoxidation reaction product and propylene epoxidation method |
| CN113968831B (en) * | 2020-07-24 | 2024-02-09 | 中国石油化工股份有限公司 | Propylene oxide refining method, propylene oxide stream separation method, epoxidation reaction product separation method and propylene epoxidation method |
| CN113968829B (en) * | 2020-07-24 | 2024-02-09 | 中国石油化工股份有限公司 | Propylene epoxidation method and epoxidation system |
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