ATE185T1 - PROCESS FOR PRESSURE AND RESIDUAL DEGASSING OF A PVC-WATER MIXTURE. - Google Patents

PROCESS FOR PRESSURE AND RESIDUAL DEGASSING OF A PVC-WATER MIXTURE.

Info

Publication number
ATE185T1
ATE185T1 AT79102666T AT79102666T ATE185T1 AT E185 T1 ATE185 T1 AT E185T1 AT 79102666 T AT79102666 T AT 79102666T AT 79102666 T AT79102666 T AT 79102666T AT E185 T1 ATE185 T1 AT E185T1
Authority
AT
Austria
Prior art keywords
confined space
foam
liquid constituents
degassing
gasses
Prior art date
Application number
AT79102666T
Other languages
German (de)
Inventor
Claus Ing. Grad. Hager
Rudolf Dr. Dipl.-Chem. Wiedholz
Original Assignee
Wacker-Chemie Gmbh
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6045534&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ATE185(T1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Wacker-Chemie Gmbh filed Critical Wacker-Chemie Gmbh
Application granted granted Critical
Publication of ATE185T1 publication Critical patent/ATE185T1/en

Links

Classifications

    • 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
    • C08F14/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
    • C08F14/02—Monomers containing chlorine
    • C08F14/04—Monomers containing two carbon atoms
    • C08F14/06—Vinyl chloride
    • 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
    • C08F6/14—Treatment of polymer emulsions
    • C08F6/16—Purification

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Physical Water Treatments (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

In the process for reducing the residual vinyl chloride monomer in an aqueous polyvinylchloride dispersion comprising the steps of depressurizing an aqueous polyvinylchloride dispersion containing emulsifiers and/or protective colloids as obtained from pressure polymerization in a polymerization zone, subjecting the same to a vacuum with heating, passing the gasses and foam of liquid constituents resulting from said depressurizing step and said vacuum treating step to a confined space wherein said gasses are separated from liquid constituents, and recovering an aqueous polyvinylchloride dispersion having a reduced residual vinyl chloride monomer content, the improvement consisting in passing said gasses and foam of liquid constituents to a confined space having a volume of not more than 331/3% of the volume of said polyvinylchloride dispersion and returning said foam of liquid constituents to said polyvinylchloride dispersion in said polymerization zone through an elongated zone of small cross-section below said confined space and at such a rate that said confined space is never completely filled with said foam of liquid constituents. According to the invention, the amount of liquid or foam accumulating in the confined space is pumped back into the degassing (polymerization) autoclave by means of a pump arranged underneath the confined space. The advantages consist in a better utilization of the separating capacity, a better and more uniform degassing of the product, and shorter degassing cycles.
AT79102666T 1978-07-27 1979-07-26 PROCESS FOR PRESSURE AND RESIDUAL DEGASSING OF A PVC-WATER MIXTURE. ATE185T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19782832972 DE2832972A1 (en) 1978-07-27 1978-07-27 METHOD FOR PRESSURE AND RESIDUE DEGASSING OF A PVC-WATER MIXTURE IN THE POLYMERIZATION AUTOCLAVE AT THE HIGHEST POSSIBLE SEPARATION DEGREE OF THE TRANSMISSION IN A ADDITIONAL SEPARATOR AND RETURN OF THE TRANSMISSION TO THE RESTOURY
EP79102666A EP0008664B1 (en) 1978-07-27 1979-07-26 Process for pressure and rest degassing of a mixture of pvc and water

Publications (1)

Publication Number Publication Date
ATE185T1 true ATE185T1 (en) 1981-09-15

Family

ID=6045534

Family Applications (1)

Application Number Title Priority Date Filing Date
AT79102666T ATE185T1 (en) 1978-07-27 1979-07-26 PROCESS FOR PRESSURE AND RESIDUAL DEGASSING OF A PVC-WATER MIXTURE.

Country Status (4)

Country Link
US (1) US4367331A (en)
EP (1) EP0008664B1 (en)
AT (1) ATE185T1 (en)
DE (2) DE2832972A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2489826A1 (en) * 1980-09-08 1982-03-12 Rhone Poulenc Ind PROCESS FOR DEGASSING MASS-PREPARED VINYL CHLORIDE POLYMERS AND COPOLYMERS AND POLYMERS AND COPOLYMERS HAVING IMPROVED IMPROVED SCREENABILITY
US4865689A (en) * 1988-01-27 1989-09-12 Mobil Oil Corporation Method and apparatus for evaporating the volatile components of a polymer
WO1996018659A1 (en) * 1994-12-12 1996-06-20 C.I.R.S. S.P.A. Method and plant for the production of polyvinylchloride in aqueous suspension with recovery of refluxes
DE19742342A1 (en) * 1997-09-25 1999-04-01 Basf Ag Continuous production of polytetrahydrofuran via a transesterification cascade with targeted foam destruction
EP1062266A4 (en) * 1997-11-20 2002-10-23 Vidaurre Miller Francisca Method and apparatus for producing gas occlusion-free and void-free compounds and composites
TW527368B (en) * 1999-04-22 2003-04-11 Chisso Corp Device and method for removing unreacted monomer from polymer latex
JP3901885B2 (en) * 1999-09-14 2007-04-04 株式会社カネカ Method of defoaming vinyl chloride paste resin latex
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
FR2805757B1 (en) * 2000-03-02 2002-05-31 Solvay METHOD AND INSTALLATION FOR EXTRACTING A MONOMER FROM AN AQUEOUS FOUL CONTAINING A POLYMER
CN115612168B (en) * 2022-08-29 2023-06-06 山东鲁泰化学有限公司 A kind of secondary recovery method of polymerization kettle for polyvinyl chloride production

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1248943C2 (en) * 1965-07-20 1974-03-07 Basf Ag Process and device for the discontinuous removal of odorous substances from aqueous polymer dispersions
CH520717A (en) * 1969-01-21 1972-03-31 Pechiney Saint Gobain Process for the preparation of homopolymers and copolymers insoluble in their monomeric compositions
JPS5339477B2 (en) * 1971-12-07 1978-10-21
DE2429777C3 (en) * 1974-06-21 1988-09-08 Hoechst Ag, 6230 Frankfurt Process for removing unreacted residual vinyl chloride from aqueous dispersions of vinyl chloride polymers
US4015064A (en) * 1974-06-24 1977-03-29 Tenneco Chemicals, Inc. Manufacture of polyvinyl chloride of low vinyl chloride monomer content
DE2435704C3 (en) * 1974-07-25 1987-06-19 Hoechst Ag, 6230 Frankfurt Process and apparatus for the continuous removal of residual monomers from aqueous dispersions of vinyl chloride polymers
JPS5147075A (en) * 1974-10-19 1976-04-22 Shinetsu Chemical Co Jugoshuryogono mihannotanryotaijokyohoho
US4031056A (en) * 1975-02-27 1977-06-21 Tenneco Chemicals, Inc. Process for the removal of vinyl chloride from latexes containing polyvinyl chloride

Also Published As

Publication number Publication date
EP0008664A1 (en) 1980-03-19
DE2832972A1 (en) 1980-02-07
US4367331A (en) 1983-01-04
EP0008664B1 (en) 1981-09-02
DE2960738D1 (en) 1981-11-26

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Legal Events

Date Code Title Description
REN Ceased due to non-payment of the annual fee
REN Ceased due to non-payment of the annual fee
RVE Rejection due to an opposition filed with the epo