CN204298289U - A kind of device of separation of methanol-dimethyl carbonate azeotrope - Google Patents
A kind of device of separation of methanol-dimethyl carbonate azeotrope Download PDFInfo
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- CN204298289U CN204298289U CN201420621051.1U CN201420621051U CN204298289U CN 204298289 U CN204298289 U CN 204298289U CN 201420621051 U CN201420621051 U CN 201420621051U CN 204298289 U CN204298289 U CN 204298289U
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- tower
- stock tank
- charging stock
- methanol
- separation
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Abstract
The utility model discloses a kind of device of separation of methanol-dimethyl carbonate azeotrope, it is characterized in that: during separation, select tray column, the batch mixing that methyl alcohol is 70:30 with the ratio of methylcarbonate enters into preheater 2 from charging stock tank 1, tray column 3 is entered after preheating, through compression rectification, tower reactor obtains the higher methylcarbonate of purity, tower top enters charging stock tank 4 through condensing reflux discharging, atmospheric distillation tower is entered afterwards by charging stock tank 4, tower top returns charging stock tank 1 through cooling for reflux discharging, and tower reactor obtains comparatively pure methyl alcohol.
Description
Technical field
The utility model relates to a kind of separating device when producing methylcarbonate, specifically a kind of device of separation of methanol-dimethyl carbonate azeotrope.
Background technology
Methylcarbonate (being called for short DMC), be a kind of very useful organic synthesis intermediate, the method for synthesis has phosgenation, alcoholysis of urea, oxidative carbonylation of methanol method, ester-interchange method.Use existing any method all can produce methyl alcohol and therefore just relate to being separated of Methanol-Dimethyl Carbonate with methylcarbonate.In the past during production methylcarbonate, transformation separation of methanol-methylcarbonate selects packing tower to be separated, but the investment of packing tower is high, is unfavorable for rapid cost-recovering, and when pressurizeing separating effect relative mistake.Find in production, with methyl alcohol and methylcarbonate for raw material, add catalyzer, through air distillation, it is 70:30 azeotrope that tower top obtains methyl alcohol with the ratio of methylcarbonate, this part azeotrope adopts packing tower compression rectification, pressure is 0.5MPa-0.7MPa, temperature 110-170 DEG C in tower, and reflux ratio is 1.5, tower top DMC addition is less than 16%, and tower reactor content can not reach 97%.
Due under pressure, the mass-and heat-transfer of tray column is effective, and thickness of liquid film on packing tower silk screen is thick, inferior separating effect.So at this moment tray column is more applicable.
Summary of the invention
The purpose of this utility model: the utility model is a kind of device of separation of methanol-dimethyl carbonate azeotrope, when producing methylcarbonate to solve, Methanol-Dimethyl Carbonate is separated and adopts packing tower cost high, the problem of inferior separating effect.
The utility model solves the technical scheme that its technical problem adopts: a kind of device of separation of methanol-dimethyl carbonate azeotrope, it is characterized in that: charging stock tank (1) goes out pipe and is connected with preheater (2), preheater (2) is connected with tray column (3) middle and upper part, tray column (3) is connected with charging stock tank (4), and charging stock tank (4) is connected with packing tower (5) middle and upper part.
Can find out that pressurizing tower is tray column according to technical scheme and accompanying drawing.
Advantage of the present utility model: 1. pressurization plate distillation column selected by former pressurization packing tower, facts have proved under equal conditions separation Methanol-Dimethyl Carbonate azeotrope, this device good separating effect.2. this device has simple to operate, good separating effect, the advantage that cost of investment is low.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of device of separation of methanol-dimethyl carbonate azeotrope.
In figure 1---tray column charging stock tank, 2---preheater, 3---plate distillation column, 4---packing tower charging stock tank, 5---packing tower.
Embodiment
On a set of 50,000 tons/year of carbonate devices, normally produce by 50,000 tons/year of carbonate devices.Methyl alcohol and the ratio of methylcarbonate are that 70:30 enters preheater 2 from tray column charging stock tank 1, plate distillation column 3 is entered by preheating, its internal pressure is 0.5MPa-0.7MPa, temperature 110-170 DEG C, after rectifying, tower top is through cooling for reflux discharging to packing tower charging stock tank 4, then enters packing tower 5 by charging stock tank 4, and packing tower is normal pressure, the discharging of packing tower overhead materials cooling for reflux enters tray column charging stock tank 1, and packing tower tower reactor obtains the very high methyl alcohol of purity.
Contrast as follows:
| Tray column | Packing tower | |
| Tower height | 40 | 40 |
| Tower diameter | 3.3M | 4.5M |
| The content of tower top methylcarbonate | ≤12% | ≤16% |
| The content of tower reactor methylcarbonate | ≥98% | ≥97% |
| Buy the cost of tower | Low | Higher |
| The maintenance cost of tower | Low | High |
| The work-ing life of tower | More than 10 years | 7-8 |
Claims (2)
1. the device of separation of methanol-dimethyl carbonate azeotrope, it is characterized in that: charging stock tank (1) goes out pipe and is connected with preheater (2), preheater (2) is connected with tray column (3) middle and upper part, tray column (3) is connected with charging stock tank (4), and charging stock tank (4) is connected with packing tower (5) middle and upper part.
2. according to a kind of described in claim 1 device of separation of methanol-dimethyl carbonate azeotrope, it is characterized in that: pressurizing tower (3) selects tray column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420621051.1U CN204298289U (en) | 2014-10-27 | 2014-10-27 | A kind of device of separation of methanol-dimethyl carbonate azeotrope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420621051.1U CN204298289U (en) | 2014-10-27 | 2014-10-27 | A kind of device of separation of methanol-dimethyl carbonate azeotrope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204298289U true CN204298289U (en) | 2015-04-29 |
Family
ID=53103847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420621051.1U Expired - Fee Related CN204298289U (en) | 2014-10-27 | 2014-10-27 | A kind of device of separation of methanol-dimethyl carbonate azeotrope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204298289U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109970565A (en) * | 2019-03-05 | 2019-07-05 | 天津中昊天久工程技术有限公司 | The technique of pressurization coupling fusion-crystallization final cell liquid grade dimethyl carbonate |
-
2014
- 2014-10-27 CN CN201420621051.1U patent/CN204298289U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109970565A (en) * | 2019-03-05 | 2019-07-05 | 天津中昊天久工程技术有限公司 | The technique of pressurization coupling fusion-crystallization final cell liquid grade dimethyl carbonate |
| CN109970565B (en) * | 2019-03-05 | 2022-03-29 | 河北迈太特化工有限公司 | Process for refining battery liquid-grade dimethyl carbonate by coupling of pressurization method and melt crystallization |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150429 Termination date: 20151027 |
|
| EXPY | Termination of patent right or utility model |