WO1998005416A1 - Mischvorrichtung für flüssigkeiten - Google Patents
Mischvorrichtung für flüssigkeiten Download PDFInfo
- Publication number
- WO1998005416A1 WO1998005416A1 PCT/EP1997/004238 EP9704238W WO9805416A1 WO 1998005416 A1 WO1998005416 A1 WO 1998005416A1 EP 9704238 W EP9704238 W EP 9704238W WO 9805416 A1 WO9805416 A1 WO 9805416A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mixing device
- housing
- solvent
- stirrer
- acrylic acid
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/48—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F29/00—Mixers with rotating receptacles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
- B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
- B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
- B01F27/902—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms cooperating with intermeshing elements fixed on the receptacle walls
- B01F27/9021—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms cooperating with intermeshing elements fixed on the receptacle walls the elements being vertically arranged, e.g. fixed on the bottom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2215/00—Auxiliary or complementary information in relation with mixing
- B01F2215/04—Technical information in relation with mixing
- B01F2215/0413—Numerical information
- B01F2215/0418—Geometrical information
- B01F2215/0427—Numerical distance values, e.g. separation, position
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2215/00—Auxiliary or complementary information in relation with mixing
- B01F2215/04—Technical information in relation with mixing
- B01F2215/0413—Numerical information
- B01F2215/0418—Geometrical information
- B01F2215/0431—Numerical size values, e.g. diameter of a hole or conduit, area, volume, length, width, or ratios thereof
Definitions
- the present invention relates to a mixing device and an advantageous application of this mixing device in the context of the production of acrylic acid by catalytic gas phase oxidation of propene.
- the problem of mixing liquids is also of particular importance, for example, in the production of acrylic acid by catalytic gas phase oxidation of propene.
- the propene to be oxidized is frequently mixed with a diluent gas or with a circulating gas containing unreacted starting materials and then fed to the gas phase oxidation.
- the reaction mixture of the gas phase oxidation is then passed into an absorption column to separate off the acrylic acid.
- There the majority of the acrylic acid formed is separated from the reaction mixture using a solvent.
- the non-absorbed components become gaseous from the absorption column removed and fed to a condensation stage.
- the condensable part of this gas mixture is separated in condensed form and discharged as so-called acid water.
- the non-condensable gaseous part is partially returned to the gas phase oxidation and forms the so-called cycle gas.
- the acid water is usually burned.
- medium boilers for example maleic anhydride
- These medium boilers can level up in the solvent without countermeasures. This can be avoided by extracting medium boilers from the solvent with the aid of acid water in an additional extraction step.
- the object of the present invention is to provide a mixing device for mixtures of liquids of different densities, which leads to intensive mixing and easy separability.
- Another object of the invention is to provide an improved method for separating organic solvents from an aqueous solution.
- the acrylic acid production process is to be improved by catalytic gas phase oxidation of propene.
- the solution to the problem is based on a mixing device for mixing at least two liquid phases, which has a housing with an inner diameter D, in which at least one stirrer with two to five vanes in the form of a circular section is attached, which have a radius of curvature K and which is characterized by the Stirrer with its rotation swept circular area within the housing has a diameter E.
- K is from 0.10 * D to 0.30 * D, preferably from 0.125 * D to 0.25 * D
- E is from 0.35 * D to 0, 65 * D, preferably from 0.45 * D to 0.55 * D.
- a stirrer preferably has 3 blades.
- D 2 * E
- the blades have a preferred shape between a quarter circle and a semicircle.
- At least one wall is preferably attached to the inside of the housing, which in turn is advantageously arranged perpendicular to the housing.
- baffles are known and promote the swirling of the liquid mixture while the rotor rotates.
- chambers are created several times in each revolution, in which the mixture is strongly swirled due to the movement of the stirrer. Above all, however, this prevents a large part of the liquid from rotating with the rotor after a certain period of rotation.
- a mixing device is also preferred, in which at least two stirrers are arranged in succession at approximately regular intervals on a common axis of rotation in the housing, the first and the last, with vertical arrangement the top and bottom stirrers keeping a distance from the housing along the axis of rotation, the 0.4 to 0.6 times, - 5th
- Figure 1 Example of a mixing device according to the invention in supervision
- Figure 2 Example of a mixing device according to the invention with 2_wei stirrers
- Figure 3 Example of a modified method according to the invention for
- Figure 1 shows a mixer with a housing 1 and a stirrer 2, which is rotatable about an axis of rotation R.
- the direction of rotation is indicated by an arrow in the sketch.
- the dimensions and the arrangement of the stirrer correspond to the conditions set out above and reproduced above for the radius of curvature K and the diameter of the swept area E.
- the blades of the stirrer shown can, for example, simply be divided, for example, with a pipe, with a suitable diameter getting produced.
- the mixer according to FIG. 1 has a three-bladed stirrer with which particularly advantageous results can be achieved in practice.
- partition plates 3 can also be attached to the inner wall of the housing in order to prevent or reduce a rotational flow of the liquid with the stirrer. These dividing walls 3 do not need to lie fully against the housing, they can also leave a gap on the housing wall free, which under certain circumstances can lead to an additional swirling of the liquid mixture.
- stirrers preferably about 0.5 times as large as the distance along the axis of rotation between the stirrers.
- the distance between the different stirrers should be approximately the same. This results in particularly favorable flow conditions, which lead to the desired intensive mixing and easy separability.
- the mixing device described can advantageously be used in a process for separating one or more organic solvents from an aqueous solution, since the mixing and thus the mass transfer and also the separation can be greatly accelerated with the mixer according to the invention. With the present invention, methods of liquid-liquid extraction can be considerably improved.
- the novel mixer can also be used in an improved process for the production of acrylic acid by catalytic gas phase oxidation of propene, acrylic acid being absorbed from the reaction mixture of the gas phase oxidation in an absorption stage with the aid of a first solvent, a gas mixture being taken from this absorption stage, that is low in the first solvent and acrylic acid, the gas mixture is cooled in a condensation stage, preferably to a temperature of 20 ° C to 60 ° C, the condensed phase of the gas mixture is removed from the condensation stage as acid water, and the gaseous phase of the Gas mixture taken from the condensation stage and at least partially recycled as cycle gas for gas phase oxidation.
- the acidic water, together with at least a partial stream of the first solvent is fed to a mixing device (as described above) and then fed to a separator in order to separate medium boilers, in particular maleic anhydride, from the first solvent.
- the first solvent contains FIG. 2 shows a particularly advantageous embodiment of the mixer according to the present invention.
- the housing 21 of this mixer has two inlets 22, 23 for the liquids to be mixed and an outlet 24 for the mixture.
- Two stirrers 27, 28 are mounted in the housing 21 according to the above conditions for the arrangement and design of the stirrer, that is to say their radius of curvature and the diameter of the area covered by them meet the conditions specified above.
- the parameters that are still open afterwards namely the distance of the stirrers 27, 28 from the top 25 and the bottom 26 of the housing 21 along the common axis of rotation R of the stirrers 27, 28 are advantageously defined as follows: the distance HQ of the stirrer 27 from Top 25 and the distance U ⁇ of the stirrer 28 to the bottom 26 of the housing 21 are approximately the same and are approximately half the distance H of the two stirrers from one another.
- This arrangement leads to particularly advantageous flow conditions in the mixer, so that the desired complete mixing with uniform droplet size is achieved very well.
- three or more stirrers can be arranged in this way, the distance between two adjacent stirrers always being approximately twice as large as the distance between the first and last or top and bottom stirrers from the housing.
- FIG. 3 finally shows a block diagram of a method according to the invention for the production of acrylic acid by catalytic gas phase oxidation.
- propene is fed via a line 31 and a dilution gas, for example air or water vapor, via a line 32 to a reactor 33 in which the catalytic Gas phase oxidation of propene takes place.
- the resulting acrolein can be oxidized in a further reactor, not shown.
- the reaction mixture of the gas phase oxidation passes through a line 34 into a quench apparatus 35.
- There the reaction mixture is cooled and part of the absorption evaporated by means of (solvent), which is fed via a line 317 to an absorption column 37 and from there is conducted via a cooling unit 36 to the quench apparatus 35.
- High-boiling secondary components of the solvent are condensed in the quench apparatus 35 and drawn off via a removal line 319. They are disposed of, for example after distilling off solvent, for example burned.
- the already strongly cooled reaction mixture is passed on from the quench apparatus 35 to the cooling unit 36, which consists, for example, of cooling circuits, where it is cooled to the suitable absorption temperature.
- the reaction mixture is then passed into the absorption column 37. There, acrylic acid is separated from the reaction product of the gas phase oxidation by countercurrent absorption with the solvent supplied via line 317.
- the solvent can consist, for example, of a mixture of 75% by weight of diphenyl ether and 25% by weight of diphenyl.
- the solvent loaded with acrylic acid is passed into cooling unit 36 and withdrawn from it via a side draw 318 for further processing, not shown here.
- This preparation regularly contains low boiler stripping and necessarily a solvent distillation or a comparable process.
- the reaction products largely freed from acrylic acid are withdrawn from the absorption column 37 overhead and passed into a quench apparatus 38, where they are cooled, preferably to a temperature of 20 ° C. to 60 ° C.
- the non-condensable part of these reaction products is removed via a line 39 and, after the separation and removal of inert gas components via a line 311, is recycled as circulating gas via a line 310 for the gas phase oxidation of propene.
- This cycle gas contains, among other things, unreacted starting materials for gas phase oxidation, nitrogen and carbon oxides.
- the condensable part of the reaction products freed from acrylic acid is fed via a line 312 taken.
- This condensate known as acid water, consists of an aqueous solution which contains not only acrylic acid but also relevant amounts of acetic acid, maleic acid and formaldehyde, as well as other acids.
- the acid water is then fed via line 312 to a mixing unit 313 according to the invention.
- the acid water is mixed with a partial stream of the first solvent, which is brought in via line 320 and comes from the treatment of the solvent stream loaded with acrylic acid.
- the mixer according to the invention produces a very homogeneous mixture of the different phases and a uniform droplet size.
- the mixture is then fed to a separator 314.
- the separated phases are then removed from the separator via lines 315 and 316.
- the stirring time could be reduced by a factor of about 10 while the phase separation was improved. Accordingly, the size of the mixer can also be reduced.
- the main steps of acrylic acid production shown can be supplemented by a large number of further steps, which, however, do not reduce the importance of the present invention.
- the treatment of the solvent, which has been drawn off from the absorption column and is loaded with acrylic acid can be carried out in a variety of ways, just as the resulting acid water can be subjected to further treatment before or after the middle boiler extraction.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9711014A BR9711014A (pt) | 1996-08-05 | 1997-08-04 | Aparelho misturador para misturar pelo menos duas fase liquidas e processo de uso do mesmo |
CA002261631A CA2261631A1 (en) | 1996-08-05 | 1997-08-04 | Mixing device for liquids |
EP97938872A EP0921851A1 (de) | 1996-08-05 | 1997-08-04 | Mischvorrichtung für flüssigkeiten |
JP10507612A JP2000515422A (ja) | 1996-08-05 | 1997-08-04 | 液体用の混合装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19631628A DE19631628A1 (de) | 1996-08-05 | 1996-08-05 | Mischvorrichtung für Flüssigkeiten |
DE19631628.6 | 1996-08-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998005416A1 true WO1998005416A1 (de) | 1998-02-12 |
Family
ID=7801867
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/004238 WO1998005416A1 (de) | 1996-08-05 | 1997-08-04 | Mischvorrichtung für flüssigkeiten |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0921851A1 (de) |
JP (1) | JP2000515422A (de) |
KR (1) | KR20000029819A (de) |
CN (1) | CN1227507A (de) |
BR (1) | BR9711014A (de) |
CA (1) | CA2261631A1 (de) |
DE (1) | DE19631628A1 (de) |
ID (1) | ID17005A (de) |
TW (1) | TW347348B (de) |
WO (1) | WO1998005416A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2798382B1 (fr) | 1999-09-14 | 2001-10-26 | Atofina | Procede de purification de l'acide acrylique obtenu par oxydation du propylene et/ou de l'acroleine |
WO2011000808A2 (de) | 2009-07-01 | 2011-01-06 | Basf Se | Verfahren der abtrennung von acrylsäure aus dem produktgasgemisch einer heterogen katalysierten partiellen gasphasenoxidation wenigstens einer c3-vorläuferverbindung |
DE102009027401A1 (de) | 2009-07-01 | 2010-02-18 | Basf Se | Verfahren der Abtrennung von Acrylsäure aus dem Produktgasgemisch einer heterogen katalysierten partiellen Gasphasenoxidation wenigstens einer C3-Vorläuferverbindung |
DE102010001228A1 (de) | 2010-01-26 | 2011-02-17 | Basf Se | Verfahren der Abtrennung von Acrylsäure aus dem Produktgasgemisch einer heterogen katalysierten partiellen Gasphasenoxidation wenigstens einer C3-Vorläuferverbindung |
CN107746952A (zh) * | 2017-10-16 | 2018-03-02 | 包头稀土研究院 | 避免液液萃取过程中混合区附着结晶物的方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1347943A (en) * | 1972-01-12 | 1974-02-27 | Maruzen Oil Co Ltd | Process for producing fibre grade terephthalic acid |
FR2237600A1 (en) * | 1973-07-16 | 1975-02-14 | Sfem | Motor driven food mixer-beater - has mesh disc connected to motor shaft adjacent blades to improve mixing |
US4243636A (en) * | 1978-02-15 | 1981-01-06 | Mitsui Petrochemical Industries Ltd. | Apparatus for the continuous liquid-phase catalytic oxidation of alkyl-substituted aromatic compounds |
EP0341813A1 (de) * | 1988-03-17 | 1989-11-15 | Amoco Corporation | Reaktor und Verfahren zur Oxidation von alkyl-aromatischen Verbindungen zu aromatischen Carbonsäuren. |
FR2638330A1 (fr) * | 1988-11-03 | 1990-05-04 | Kaufler Sa | Cuve de preparation de gelee |
-
1996
- 1996-08-05 DE DE19631628A patent/DE19631628A1/de not_active Withdrawn
-
1997
- 1997-08-04 KR KR1019997000964A patent/KR20000029819A/ko not_active Application Discontinuation
- 1997-08-04 CA CA002261631A patent/CA2261631A1/en not_active Abandoned
- 1997-08-04 JP JP10507612A patent/JP2000515422A/ja active Pending
- 1997-08-04 TW TW086111136A patent/TW347348B/zh active
- 1997-08-04 BR BR9711014A patent/BR9711014A/pt not_active Application Discontinuation
- 1997-08-04 WO PCT/EP1997/004238 patent/WO1998005416A1/de not_active Application Discontinuation
- 1997-08-04 EP EP97938872A patent/EP0921851A1/de not_active Withdrawn
- 1997-08-04 CN CN97197062A patent/CN1227507A/zh active Pending
- 1997-08-05 ID IDP972712A patent/ID17005A/id unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1347943A (en) * | 1972-01-12 | 1974-02-27 | Maruzen Oil Co Ltd | Process for producing fibre grade terephthalic acid |
FR2237600A1 (en) * | 1973-07-16 | 1975-02-14 | Sfem | Motor driven food mixer-beater - has mesh disc connected to motor shaft adjacent blades to improve mixing |
US4243636A (en) * | 1978-02-15 | 1981-01-06 | Mitsui Petrochemical Industries Ltd. | Apparatus for the continuous liquid-phase catalytic oxidation of alkyl-substituted aromatic compounds |
EP0341813A1 (de) * | 1988-03-17 | 1989-11-15 | Amoco Corporation | Reaktor und Verfahren zur Oxidation von alkyl-aromatischen Verbindungen zu aromatischen Carbonsäuren. |
FR2638330A1 (fr) * | 1988-11-03 | 1990-05-04 | Kaufler Sa | Cuve de preparation de gelee |
Also Published As
Publication number | Publication date |
---|---|
CN1227507A (zh) | 1999-09-01 |
BR9711014A (pt) | 1999-08-17 |
EP0921851A1 (de) | 1999-06-16 |
KR20000029819A (ko) | 2000-05-25 |
ID17005A (id) | 1997-11-27 |
JP2000515422A (ja) | 2000-11-21 |
TW347348B (en) | 1998-12-11 |
CA2261631A1 (en) | 1998-02-12 |
DE19631628A1 (de) | 1998-02-12 |
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