EP1641836A1 - Colonne a plateaux destinee a la separation de chlorure de vinyle monomere (vcm) du chlorure de polyvinyle (pvc) dans le procede de suspension - Google Patents

Colonne a plateaux destinee a la separation de chlorure de vinyle monomere (vcm) du chlorure de polyvinyle (pvc) dans le procede de suspension

Info

Publication number
EP1641836A1
EP1641836A1 EP04739520A EP04739520A EP1641836A1 EP 1641836 A1 EP1641836 A1 EP 1641836A1 EP 04739520 A EP04739520 A EP 04739520A EP 04739520 A EP04739520 A EP 04739520A EP 1641836 A1 EP1641836 A1 EP 1641836A1
Authority
EP
European Patent Office
Prior art keywords
plate column
suspension
nozzle
sprayed
plate
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Withdrawn
Application number
EP04739520A
Other languages
German (de)
English (en)
Inventor
Christian Bauer
Detlev Keil
Klaus Röder
Alfred Striebich
Ulrich Woike
Ingolf Mielke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Industrial Solutions AG
Westlake Vinnolit GmbH and Co KG
Original Assignee
Uhde GmbH
Vinnolit GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Uhde GmbH, Vinnolit GmbH and Co KG filed Critical Uhde GmbH
Publication of EP1641836A1 publication Critical patent/EP1641836A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/042—Prevention of deposits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/008—Liquid distribution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B01D3/16—Fractionating columns in which vapour bubbles through liquid
    • B01D3/18—Fractionating columns in which vapour bubbles through liquid with horizontal bubble plates
    • B01D3/20—Bubble caps; Risers for vapour; Discharge pipes for liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/34—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping with one or more auxiliary substances
    • B01D3/38—Steam distillation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F6/00—Post-polymerisation treatments
    • C08F6/001—Removal of residual monomers by physical means
    • C08F6/003—Removal of residual monomers by physical means from polymer solutions, suspensions, dispersions or emulsions without recovery of the polymer therefrom

Definitions

  • the invention relates to a plate column used in the manufacture of PVC by the suspension process to separate the PVC from unreacted VCM.
  • the invention furthermore relates to a method of preventing the formation of or removing a deposit in'a " plate column and, finally, the invention relates to a novel use of tangential cone nozzles, especially commercially available tangential cone nozzles.
  • the monomeric starting material VCM
  • VCM the monomeric starting material
  • the reaction mixture is worked up, for example in so-called plate columns in which usually the reaction mixture is introduced at the top an. ' d flushing is carried out from the bottom by a stream of steam so that the sump material containing the polymeric product can be separated from the monomeric starting material.
  • the polymeric product is then in the form of an aqueous suspension with a solids content whereas the monomeric starting material leaves the plate column at the top with the stream of steam.
  • the reaction mixture that is to say, the suspension
  • deposits form on the inside of the column wall and on the underside of the column plates.
  • the deposited material either remains on the column wall and/or the column plate for the entire operating time (also referred to as the "service life") (and thereby impedes the stream of steam and/or interferes with temperature gradients in the plate column, for example) or becomes detached from the column wall and/or the column plate after a certain time, during which it has been exposed to the elevated temperature, and is entrained by the suspension stream.
  • the deposited material has a dark discoloration and is clearly discernible as a contaminant in the white product. Since that contamination would reduce the value of the product, the plate column has to be shut down and cleaned at relatively short intervals. That measure is laborious, means product losses and generates costs.
  • US 4 369 092 describes a device for preventing plate and/or wall deposits which is installed beneath each plate of the column and is operated with hot water. Considerable quantities of water are consumed and the injected water has to be heated in each case to the temperature of the stream of steam in order to maintain the operability of the plate column. The specified temperature must be maintained since, if the temperature exceeds or falls below that specified value, there is the risk that evaporation of water or condensation of steam, respectively, will interfere with the operation of the plate column. Furthermore, it requires a large clearance between the plates of the column so that the flushing device can be accommodated. The plate column can no longer be as densely packed and becomes less economic.
  • the object of the invention's therefore to provide an economic apparatus and a method by which the formation of deposits in a plate column for working up an aqueous PVC • suspension is reduced, a long service life of the plate column is ensured and the proportion of solids having a dark discoloration is minimised, it also being an object of the invention to give a new use for tangential cone nozzles, including commercially available tangential cone nozzles.
  • the invention relates especially to a plate column for the separation of an aqueous PVC/VCM suspension, in which the PVC/VCM suspension introduced, for example, from the top at the inlet of the plate column has hot steam passed through it, preferably in counter-current, in which the monomeric VCM leaves the suspension with the stream of steam through a line arranged in the plate column preferably at the top, and the suspension containing the polymeric PVC product collects in the sump portion of the plate column arranged at the bottom, wherein at least one line is ' so arranged that suspension from the sump portion is able to flow through it to at least one nozzle which, in accordance with this embodiment, is provided in the plate column between the inlet and the sump portion (that is to say, in the middle portion of the plate column), so that suspension from the sump portion is sprayed into the interior of the plate column and prevents deposition and/or the formation of undesirable deposits therein.
  • the invention also relates to a method for the removal and/or for the prevention of the formation of a deposit in the interior of a plate column for the separation of an aqueous PVC/VCM suspension, in which method suspension from the sump portion of the plate column is sprayed by at least one nozzle into the interior of the plate column in such a manner that it serves therein to clean the sprayed areas and/or to prevent deposits.
  • the invention relates to the use of cone nozzles, especially commercially available tangential cone nozzles, for spraying suspension from the sump portion of a plate column.
  • cone nozzles may be obtained, for example, from Lechler, D-72544 Metzingen, as type series 422.
  • the line(s) conveying suspension from the sump portion of the plate column to the nozzle(s) may be connected directly to the sump portion and/or to a line leading away from the sump portion.
  • At least one tangential full cone nozzle is used.
  • the nozzles have, for example, a jet angle of 90 - 140°, especially about 120°.
  • the suspension is sprayed at a coverage density of 100 - 500 l/(m 2 min), preferably 250 - 350 l/(m 2 min) and especially about 300 l/(m 2 min).
  • the suspension from the sump portion is sprayed against the lower face of at least one plate of the plate column and/or against the inside wall.
  • at least the lowermost plate or the inside wall especially below the lowermost plate is sprayed.
  • the suspension from the surrip portion is sprayed against the lower faces of a plurality of plates of the plate column and/or against the inside wall.
  • the suspension from the sump portion of the plate column is sprayed against the lower faces of all the plates of the plate column and/or against the inside wall.
  • the suspension from the sump portion of the plate column is sprayed continuously into the middle portion of the plate column.
  • the suspension is sprayed with a flushing time in the range of 15 - 120 seconds and with a flushing interval of 15 - 90 minutes.
  • the suspension line to the nozzle(s) branches off the feed line to the next process stage on the pressure side of the suspension pump.
  • the system is so configured that a pressure drop sufficient to maintain the flow rate required to obtain the coverage density, according to the characteristic of the nozzle type employed, still occurs at the nozzle(s).
  • a tangential full cone nozzle having a jet angle of 120° and a smallest diameter of 8 mm was installed 150 mm below the lowermost plate in a plate column having a column diameter of 300 mm.
  • Suspension coming from a line that conveys the PVC-containing suspension away from the sump portion of the plate column was continuously sprayed from that nozzle at a pressure of 1.6 bar, that is to say, at a flow rate of about 22 l/min, against the underside of the lowermost plate of the plate column and against a portion of the inside wall of the plate column.
  • the tangential full cone nozzle for removing and preventing deposits was operated continuously, and the suspension used for the purpose was taken from a line that conveys the medium out of the sump.
  • the pressure, which was relieved at the nozzle, was about 1.6 bar, which corresponds to a sprayed suspension volume of about 22 l/min.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Dispersion Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

L'invention concerne une colonne à plateaux utilisée dans la fabrication du PVC lors du procédé de suspension pour séparer le PVC du VCM inaltéré. L'invention concerne également un procédé permettant d'éviter la formation d'un dépôt dans une colonne à plateaux et également une nouvelle application de buses à jet conique tangentiel disponibles dans le commerce. Pour nettoyer l'intérieur de la colonne à plateaux et/ou éviter la formation de dépôts, les suspensions de la partie de décantation de la colonne à plateaux sont pulvérisées dans la partie du milieu de la colonne à plateaux.
EP04739520A 2003-07-03 2004-06-02 Colonne a plateaux destinee a la separation de chlorure de vinyle monomere (vcm) du chlorure de polyvinyle (pvc) dans le procede de suspension Withdrawn EP1641836A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10330105 2003-07-03
PCT/EP2004/005940 WO2005003187A1 (fr) 2003-07-03 2004-06-02 Colonne a plateaux destinee a la separation de chlorure de vinyle monomere (vcm) du chlorure de polyvinyle (pvc) dans le procede de suspension

Publications (1)

Publication Number Publication Date
EP1641836A1 true EP1641836A1 (fr) 2006-04-05

Family

ID=33559854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04739520A Withdrawn EP1641836A1 (fr) 2003-07-03 2004-06-02 Colonne a plateaux destinee a la separation de chlorure de vinyle monomere (vcm) du chlorure de polyvinyle (pvc) dans le procede de suspension

Country Status (2)

Country Link
EP (1) EP1641836A1 (fr)
WO (1) WO2005003187A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201823189A (zh) * 2011-12-06 2018-07-01 比利時商首威公司 生產氯乙烯單體（ｖｃｍ）及聚氯乙烯（ｐｖｃ）之方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ184661A (en) * 1976-07-27 1979-08-31 Ici Australia Ltd Removing monomer from vinyl chloride polymers
GB1593377A (en) * 1976-12-10 1981-07-15 Emi Ltd Security document and system
DE2759097A1 (de) * 1977-12-30 1979-07-12 Norsk Hydro As Verfahren zur entfernung von vinylchlorid aus polyvinylchloriddispersionen, sowie eine kolonne zur durchfuehrung des verfahrens
US6277954B2 (en) * 1999-09-14 2001-08-21 Kaneka Corporation Method of stripping for latex of vinyl chloride paste resin, stripping apparatus, and vinyl chloride paste resin latex having low concentration of residual monomer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005003187A1 *

Also Published As

Publication number Publication date
WO2005003187A1 (fr) 2005-01-13

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