CN105085200A - DME (dimethyl ether) recovery device in double-rectifying-tower structure form and DME recovery method - Google Patents
DME (dimethyl ether) recovery device in double-rectifying-tower structure form and DME recovery method Download PDFInfo
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- CN105085200A CN105085200A CN201510544692.0A CN201510544692A CN105085200A CN 105085200 A CN105085200 A CN 105085200A CN 201510544692 A CN201510544692 A CN 201510544692A CN 105085200 A CN105085200 A CN 105085200A
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- tower
- dme
- rectifying
- water
- rectifying tower
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/01—Preparation of ethers
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/01—Preparation of ethers
- C07C41/34—Separation; Purification; Stabilisation; Use of additives
- C07C41/40—Separation; Purification; Stabilisation; Use of additives by change of physical state, e.g. by crystallisation
- C07C41/42—Separation; Purification; Stabilisation; Use of additives by change of physical state, e.g. by crystallisation by distillation
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a DME (dimethyl ether) recovery device in a double-rectifying-tower structure form and a DME recovery method. The DME recovery device comprises a first rectifying tower and a second rectifying tower, wherein the first rectifying tower is arranged at the back end of an HPMC (hydroxypropyl methyl cellulose) reaction kettle; the tower bottom of the first rectifying tower is provided with a feeding pipe connected with the HPMC reaction kettle and a water inlet pipe connected with a water storage tank; the tower top of the first rectifying tower is connected with a material return pipe connected with the HPMC reaction kettle; the tower bottom of the second rectifying tower is connected with the tower bottom of the first rectifying tower through a conveying pipe; the tower top of the second rectifying tower is connected with a DME storage tank through a discharging pipe. The DME recovery device in the double-rectifying-tower structure form and the DME recovery method provided by the invention have the advantage that DME generated in the reaction process can be recovered and utilized.
Description
Technical field
The present invention relates to a kind of DME retrieving arrangement and recovery method thereof of double rectification column structure formation.
Background technology
Domestic traditional HPMC production of cellulose ether adopts slurry process, and adopt Virahol and toluene equal solvent as dispersion medium, there is following defect: 1) the inflammable volatile easy intoxicating of acetone, toluene is inflammable and explosive, big for environment pollution; 2) dme produced in process of production is drained together in company with water, causes great waste, and can cause huge water COD content, increases cost and the burden of water treatment, causes the pollution to environment.
DME is the by product in reaction process, and the reactor one batch of a 26m3 react produce DME be 1.5 tons, if do not recycled, huge water COD content can be caused, increase cost and the burden of water treatment, also cause huge waste simultaneously, because itself and MeCl have boiling point closely, be difficult to both to separate by common distillation mode, be therefore badly in need of the separation of a kind of both method realizations of innovation.
Summary of the invention
The present invention is directed to above-mentioned defect, object is to provide a kind of DME retrieving arrangement and the recovery method thereof that the DME produced in reaction process can be carried out a kind of double rectification column structure formation recycled.
The technical solution used in the present invention is for this reason: the present invention includes the first rectifying tower and Second distillation column;
Described first rectifying tower is arranged on HPMC reactor rear end, is provided with the feed-pipe be connected with HPMC reactor at the bottom of the first rectifying tower, and and the tank connected water inlet pipe of water storage, described first rectifying tower tower top arranges and is connected to the feed back pipe of HPMC reactor;
Be connected at the bottom of the tower of the first rectifying tower at the bottom of the tower of described Second distillation column by transfer lime, the tower top of described Second distillation column connects DME storage tank by discharge nozzle.
At the bottom of the tower of described first rectifying tower and be provided with between tower top by both be communicated with circulation tube.
The return water pipe being connected to water tank is provided with at the bottom of described Second distillation column tower.
The present invention carries out according to following steps: dme, monochloro methane are entered at the bottom of the first rectifying tower by feed-pipe, and are intake by water inlet pipe, adds the water yield and meets the following conditions: the mass ratio not being dissolved in MeCl and DME in water is 1:3-5;
Then the first rectifying tower rectifying, the rectifying liquid MeCl:DME=1:3-5 that tower top is distillated, tower top rectifying liquid to return to reactor as reaction solvent and dispersion medium, and the aqueous solution containing DME at the bottom of tower enters Second distillation column and realizes being separated of DME and water.
Advantage of the present invention is: 1) dme of Separation and Recovery can be reentered reaction system as reaction raw materials by the present invention, recycles, and reduces and pollutes, and waste, creates huge economic benefit;
2) the present invention utilizes the difference of MeCl and DME solubleness in water, is first dissolved in water by a part of DME, and the DME of this part can't go out in the first rectifying tower in rectifying, and DME dissolve in water saturated after; Unnecessary DME understands rectifying together with MeCl and goes out, and through design, can obtain satisfactory DME, MeCl mixed solution completely as the use reclaiming reaction; And the DME be dissolved in water enters in Second distillation column, utilize the difference of DME and water volatility realize both be separated, effectively utilize reclaiming the DME obtained.
Accompanying drawing explanation
Fig. 1 is the structural representation of retrieving arrangement of the present invention.
Embodiment
The present invention includes the first rectifying tower and Second distillation column;
Described first rectifying tower is arranged on HPMC reactor rear end, is provided with the feed-pipe be connected with HPMC reactor at the bottom of the first rectifying tower, and and the tank connected water inlet pipe of water storage, described first rectifying tower tower top arranges and is connected to the feed back pipe of HPMC reactor;
Be connected at the bottom of the tower of the first rectifying tower at the bottom of the tower of described Second distillation column by transfer lime, the tower top of described Second distillation column connects DME storage tank by discharge nozzle.
At the bottom of the tower of described first rectifying tower and be provided with between tower top by both be communicated with circulation tube.
The return water pipe being connected to water tank is provided with at the bottom of described Second distillation column tower.
The present invention carries out according to following steps: dme, monochloro methane are entered at the bottom of the first rectifying tower by feed-pipe, and are intake by water inlet pipe, adds the water yield and meets the following conditions: the mass ratio not being dissolved in MeCl and DME in water is 1:3-5;
Then the first rectifying tower rectifying, the rectifying liquid MeCl:DME=1:3-5 that tower top is distillated, tower top rectifying liquid to return to reactor as reaction solvent and dispersion medium, and the aqueous solution containing DME at the bottom of tower enters Second distillation column and realizes being separated of DME and water.
Claims (4)
1. a DME retrieving arrangement for double rectification column structure formation, is characterized in that, comprises the first rectifying tower and Second distillation column;
Described first rectifying tower is arranged on HPMC reactor rear end, is provided with the feed-pipe be connected with HPMC reactor at the bottom of the first rectifying tower, and and the tank connected water inlet pipe of water storage, described first rectifying tower tower top arranges and is connected to the feed back pipe of HPMC reactor;
Be connected at the bottom of the tower of the first rectifying tower at the bottom of the tower of described Second distillation column by transfer lime, the tower top of described Second distillation column connects DME storage tank by discharge nozzle.
2. the DME retrieving arrangement of a kind of double rectification column structure formation according to claim 1, is characterized in that, at the bottom of the tower of described first rectifying tower and be provided with between tower top by both be communicated with circulation tube.
3. the DME retrieving arrangement of a kind of double rectification column structure formation according to claim 1, is characterized in that, is provided with the return water pipe being connected to water tank at the bottom of described Second distillation column tower.
4. a DME recovery method, it is characterized in that, carry out according to following steps: dme, monochloro methane are entered at the bottom of the first rectifying tower by feed-pipe, and are intake by water inlet pipe, add the water yield and meet the following conditions: the mass ratio not being dissolved in MeCl and DME in water is 1:3-5;
Then the first rectifying tower rectifying, the rectifying liquid MeCl:DME=1:3-5 that tower top is distillated, tower top rectifying liquid to return to reactor as reaction solvent and dispersion medium, and the aqueous solution containing DME at the bottom of tower enters Second distillation column and realizes being separated of DME and water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510544692.0A CN105085200A (en) | 2015-08-31 | 2015-08-31 | DME (dimethyl ether) recovery device in double-rectifying-tower structure form and DME recovery method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510544692.0A CN105085200A (en) | 2015-08-31 | 2015-08-31 | DME (dimethyl ether) recovery device in double-rectifying-tower structure form and DME recovery method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105085200A true CN105085200A (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510544692.0A Pending CN105085200A (en) | 2015-08-31 | 2015-08-31 | DME (dimethyl ether) recovery device in double-rectifying-tower structure form and DME recovery method |
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| CN (1) | CN105085200A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020252553A1 (en) * | 2019-06-19 | 2020-12-24 | Formitex Da Bahia Indústria E Comércio S.A. | Process and system for vent recovery from the production of hydroxypropyl methylcellulose (hpmc) |
-
2015
- 2015-08-31 CN CN201510544692.0A patent/CN105085200A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020252553A1 (en) * | 2019-06-19 | 2020-12-24 | Formitex Da Bahia Indústria E Comércio S.A. | Process and system for vent recovery from the production of hydroxypropyl methylcellulose (hpmc) |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151125 |
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| WD01 | Invention patent application deemed withdrawn after publication |