EP1720928A1 - Verfahren und vorrichtung zur herstellung von polyestern und copolyestern - Google Patents
Verfahren und vorrichtung zur herstellung von polyestern und copolyesternInfo
- Publication number
- EP1720928A1 EP1720928A1 EP04803840A EP04803840A EP1720928A1 EP 1720928 A1 EP1720928 A1 EP 1720928A1 EP 04803840 A EP04803840 A EP 04803840A EP 04803840 A EP04803840 A EP 04803840A EP 1720928 A1 EP1720928 A1 EP 1720928A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- diol
- spray nozzles
- mixing condenser
- mixing
- downpipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0027—Condensation of vapours; Recovering volatile solvents by condensation by direct contact between vapours or gases and the cooling medium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
- C08G63/785—Preparation processes characterised by the apparatus used
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
- B01J2219/00105—Controlling the temperature by indirect heating or cooling employing heat exchange fluids part or all of the reactants being heated or cooled outside the reactor while recycling
- B01J2219/0011—Controlling the temperature by indirect heating or cooling employing heat exchange fluids part or all of the reactants being heated or cooled outside the reactor while recycling involving reactant liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00121—Controlling the temperature by direct heating or cooling
- B01J2219/00123—Controlling the temperature by direct heating or cooling adding a temperature modifying medium to the reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00121—Controlling the temperature by direct heating or cooling
- B01J2219/0013—Controlling the temperature by direct heating or cooling by condensation of reactants
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
Definitions
- the invention relates to a method and apparatus for Hersannon of polyesters or copolyesters by esterification of dicarboxylic acids and diols, or by transesterification of dicarboxylic acid esters and diols in multiple reaction pressure stages, Vork 'ondensation the encryption / transesterification product in at least one reaction pressure stage and polycondensation of the precondensation product in at least one Reaction pressure stage, by setting the pressure in the reaction pressure stages for the pre-condensation and polycondensation in the range from 0.2 to 500 mbar and the temperature in the range from 230 to 330 ° C, the vapors formed during the pre-condensation and polycondensation condense in a condensation stage and the resulting diol cooled, returned to the condensation stage and excess diol discharged and fed to the process.
- the vapors formed in the production of polyethylene terephthalate (PET) from terephthalic acid (TPA) or dimethyl terephthalate (DMT) and ethanediol (EG) contain, in addition to the split diol, low-boiling by-products and degradation products such as water, methanol, actaidehyde, which together with leakage air cause a comparatively high molar proportion of inert, non-condensable constituents in the vapor mixture. These inert components limit the intensity of the heat transfer during the condensation of the vapors.
- aerosol-like droplets of fine product that are carried in the vapors are deposited in the excess area of the vapor supply line to the cold, non-wetted condensation and / and solidify to form larger deposits which impair trouble-free operation of the condensation system or stable polymer production.
- US-A-2793235 describes a process for the production of polyester in which the vapors are fed centrally from above to a spray condenser with an unheated conical cover having four spray nozzles and condensate is drawn off centrally below. The remaining vapors are removed from the side and fed to a droplet separator (demister) with wetted wire mesh and a downstream separator (catch pot), which are connected to a common EG circuit with immersion tank, circulation pump and cooler.
- a droplet separator demister
- a downstream separator separator
- an ester-free EG is generated by alkaline ester saponification. This process disadvantageously produces ester compounds; the corresponding disposal of the alkali salts of the TPA involves considerable effort.
- the mean drop diameter d s of the sprayed diol determined according to SAUTER is 0.5 to 2.5 mm and the mean drop flight duration of the sprayed diol is 0.05 to 0.5 s.
- the finely divided polymer aggregates are separated off as a sieve residue and / or discharged together with the excess diol from the immersion container of the downpipe.
- a special embodiment of the invention is that the inner wall of the mixing condenser is completely wetted with a trickle film of recycled diol in order to avoid the sublimation of oligomers and monomers on cold zones of the mixing condenser.
- the trickle film is amplified or stabilized by the sprayed diol and at the lower edge of the mixing condenser in a vertical closed falling film extending to the funnel wall of the downpipe transferred so that the space for the effect of the sprayed diol extends to the funnel-side end of the falling film.
- the openings of the spray nozzles located in one plane are offset from those of the adjacent plane on the circumference of the mixing condenser. This measure covers the entire cross-section of the mixing condenser with recirculated diol, so that if one spray nozzle fails locally, a gradual drop in the frequency of drops does not result in gaps.
- the spray patterns of the spray nozzles in addition to an optimal use of space in the mixing condenser, extensive homogeneity of the diol spray and efficient heat exchange between the hot vapors and the cold diol are achieved.
- the vapors are cooled more rapidly to the dew point of the diol.
- the spray patterns formed by the spray nozzles have the shape of a full cone with a scattering angle in the range from 60 to 140 ° and, within the scope of the inventive configuration, those of the spray nozzles located in the upper head-side plane shaped full cones have a scattering angle in the range from 60 to 120 ° and the full cones shaped by the spray nozzles located in the plane below have a scattering angle in the range from 100 to 140 °.
- the axes of the full cones intersect the vertical axis of the mixing condenser at an angle in the range from 5 to 75 °, while the axes of the full cones formed by the spray nozzles located in the upper head-side plane intersect the vertical axis of the mixing condenser at an angle in the range from 5 to 60 ° and the axes of the voile cones formed by the spray nozzles in the plane below intersect the vertical axis of the mixing condenser at an angle of 50 to 75 °.
- the full cones formed by the spray nozzles are! circular.
- the spray nozzles arranged in at least one of the planes on the head side can have the spray pattern of a rectangular full cone.
- At least three openings of spray nozzles are provided in each of the planes in which recirculated diol is sprayed, the openings of the spray nozzles on one plane being half the central angle between two adjacent spray nozzles on one plane in relation to those of the second plane are staggered.
- a special embodiment of the device is that the ceiling! of the mixing condenser and the vapor tube arranged in the inlet opening of the cover can be heated.
- the spray nozzles of the upper head-side level are positioned in the lid, preferably in a heat-insulated manner.
- the spray nozzles and the liquid pressure nozzle are expediently held via a lance or a vent.
- the end of the arranged in the lid of the mixing condenser protrudes Vapor tube beyond the inner wall of the lid and has a sharp drip edge, from which polymer strands formed in the vapor tube are passed directly into the spray chamber of the mixing condenser, solidified there to form aggregates of limited size and rinsed out with the diol via the downpipe, collected in the immersion container of the downpipe and from there are removed separately or removed together with excess diol.
- a ring that is concentric around the outside of the vapor tube is attached to the inner wall of the lid as a drip edge.
- the foot-side edge of the mixing condenser is provided with a recess diametrically opposite the residual vapor outflow from the annular space existing between the wall of the mixing condenser and the wall of the funnel-shaped extension of the barometrically submerged downpipe.
- the foot-side edge is provided with whole or section sawtooth profiles.
- a circumferential ring nozzle is attached to the inside of the mixing condenser in the upper cylindrical edge region.
- FIG. 1 shows a longitudinal section through a mixing condenser with a downstream barometric immersed downpipe
- FIG. 2 shows a schematic plan view of the mixing condenser with spray nozzles shown
- FIG. 3 shows a schematic process flow diagram.
- the vapors supplied via the pipeline (1) which have a temperature of approx. 280 ° C and contain oligomers and polymers in small quantities, are passed under a vacuum of 1 mbar via the pipeline elbow (2), which is inserted into the heated lid (3 ) of the mixing condenser (4) located vapors merges into the spray chamber (5) of the mixing condenser (4) initiated.
- the mixing condenser (4) dips with its foot region (6) to form an upwardly closed annular space (7) with a flat cover (8) in a cylindrical section (9) and a frustoconical section (10) adjoining at the bottom.
- existing funnel (12) connected with a barometric submerged downpipe (1 1).
- the molten polymer which deposits on the inner wall of the pipe bend (2) flows to the protruding end of the pipe mouth which is designed as a drip edge (27) and drips like streaks into the spray chamber (5) of the mixing condenser (4).
- the finely divided polymer aggregates solidified in the mixing condenser (4) are passed together with the diol via the frustoconical section (10) of the funnel (12) into the barometric immersed downpipe (11) and with one in the immersion container (28) of the downpipe (1 1) arranged sieve (29) collected.
- the wall of the mixing condenser (5) is provided with an opening (30), thereby avoiding an uncontrolled direct removal of residual vapors loaded with diol.
- the height of the diol column in the downpipe (11) depends on the pressure p prevailing in the mixing condenser (4).
- diol is pumped through the pump (32) Radiator (33) off the immersion tank (28) to the openings (13, 14) of the spray nozzles (17, 18).
- Condensed diol and fresh diol mixed in from the mist nozzle (24) return through the downpipe (11) to the immersion tank (28). Excess diol is drained off via line (34). Fresh diol is alternatively fed to the immersion tank (28) via line (35).
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Polyesters Or Polycarbonates (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004010146A DE102004010146B4 (de) | 2004-02-27 | 2004-02-27 | Verfahren und Vorrichtung zur Herstellung von Polyestern und Copolyestern |
| PCT/EP2004/014214 WO2005082970A1 (de) | 2004-02-27 | 2004-12-14 | Verfahren und vorrichtung zur herstellung von polyestern und copolyestern |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1720928A1 true EP1720928A1 (de) | 2006-11-15 |
Family
ID=34877248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04803840A Withdrawn EP1720928A1 (de) | 2004-02-27 | 2004-12-14 | Verfahren und vorrichtung zur herstellung von polyestern und copolyestern |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US20090192285A1 (de) |
| EP (1) | EP1720928A1 (de) |
| JP (1) | JP2007523981A (de) |
| KR (1) | KR20060134077A (de) |
| CN (1) | CN1922237A (de) |
| DE (1) | DE102004010146B4 (de) |
| EA (1) | EA009740B1 (de) |
| LT (1) | LT5406B (de) |
| TW (1) | TWI300075B (de) |
| UA (1) | UA80375C2 (de) |
| WO (1) | WO2005082970A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007050929B4 (de) * | 2007-10-23 | 2012-10-25 | Lurgi Zimmer Gmbh | Verfahren und Vorrichtung zur Erzeugung von Vakuum bei der Herstellung von Polyestern und Copolyestern |
| WO2013156668A1 (en) * | 2012-04-17 | 2013-10-24 | Andritz Oy | Method and arrangement for intensifying and controlling evaporation |
| CN104174348B (zh) * | 2013-05-20 | 2017-07-21 | 宁波凯诚环保科技有限公司 | 中和反应釜及中和反应方法 |
| CN104162400B (zh) * | 2013-05-20 | 2016-05-11 | 宁波凯诚环保科技有限公司 | 水洗反应釜及水洗反应方法 |
| US20230295071A1 (en) * | 2020-09-24 | 2023-09-21 | Lg Chem, Ltd. | Method for preparing ester-based composition |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2793235A (en) * | 1954-09-27 | 1957-05-21 | Du Pont | Recovery of glycols from polyester production |
| DE1503688B2 (de) * | 1965-11-11 | 1976-11-18 | Verfahren zum foerdern von dampffoermigem aethylenglykol, das bei der herstellung von polyester in reaktionsgefaessen frei wird und verunreinigungen enthaelt | |
| CH487345A (de) | 1965-11-11 | 1970-03-15 | Karl Fischer App Und Rohrleitu | Verfahren zur Förderung eines dampfförmigen Stoffes und Anwendung dieses Verfahrens |
| JPS60202121A (ja) * | 1984-03-28 | 1985-10-12 | Hitachi Ltd | 重合留出物捕集装置 |
| DE4419397A1 (de) * | 1994-06-03 | 1995-12-14 | Zimmer Ag | Verfahren zur mehrstufigen Vakuumerzeugung bei der Polyester-Herstellung |
| JP2000109550A (ja) * | 1998-10-01 | 2000-04-18 | Nippon Ester Co Ltd | 共重合ポリエステルの製造装置 |
-
2004
- 2004-02-27 DE DE102004010146A patent/DE102004010146B4/de not_active Expired - Lifetime
- 2004-12-14 US US10/585,470 patent/US20090192285A1/en not_active Abandoned
- 2004-12-14 UA UAA200609277A patent/UA80375C2/uk unknown
- 2004-12-14 CN CNA2004800421664A patent/CN1922237A/zh active Pending
- 2004-12-14 KR KR1020067017156A patent/KR20060134077A/ko not_active Withdrawn
- 2004-12-14 EA EA200601369A patent/EA009740B1/ru not_active IP Right Cessation
- 2004-12-14 WO PCT/EP2004/014214 patent/WO2005082970A1/de not_active Ceased
- 2004-12-14 EP EP04803840A patent/EP1720928A1/de not_active Withdrawn
- 2004-12-14 JP JP2007500064A patent/JP2007523981A/ja not_active Withdrawn
-
2005
- 2005-02-24 TW TW094105629A patent/TWI300075B/zh active
-
2006
- 2006-06-19 LT LT2006051A patent/LT5406B/lt not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005082970A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1922237A (zh) | 2007-02-28 |
| US20090192285A1 (en) | 2009-07-30 |
| EA009740B1 (ru) | 2008-04-28 |
| LT5406B (lt) | 2007-03-26 |
| WO2005082970A1 (de) | 2005-09-09 |
| JP2007523981A (ja) | 2007-08-23 |
| TWI300075B (en) | 2008-08-21 |
| KR20060134077A (ko) | 2006-12-27 |
| EA200601369A1 (ru) | 2006-12-29 |
| LT2006051A (en) | 2006-12-27 |
| DE102004010146B4 (de) | 2006-02-16 |
| DE102004010146A1 (de) | 2005-09-22 |
| TW200528485A (en) | 2005-09-01 |
| UA80375C2 (en) | 2007-09-10 |
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| 18W | Application withdrawn |
Effective date: 20081204 |