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Process for the polymerisation of vinyl-containing monomers

A polymerization method, vinyl technology, applied in the direction of chemical recycling, etc., to achieve a well-controlled effect

Active Publication Date: 2008-01-30
VINNOLIT GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Costs, in addition to the supply of fresh fully deionized water, are also associated with the discharge of environmentally acceptable used solvents or waste water also have an adverse impact on the economics of the process

Method used

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  • Process for the polymerisation of vinyl-containing monomers
  • Process for the polymerisation of vinyl-containing monomers
  • Process for the polymerisation of vinyl-containing monomers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] S-PVC, K value 70

[0042] Polymerization of vinyl chloride was carried out in an aqueous reaction mixture at a temperature of 53° C. in a reactor using the method shown in FIG. 1 . After degassing, the resulting reaction mixture was mechanically dehydrated in a centrifuge and the polymer product was separated off. The reaction mixture from the centrifuge was filtered through a conventional plate module. The filtered solids were removed and the filtered reaction mixture was returned to the reactor and reused for further polymerization. Repeat the steps described several times for this PVC type. The quality of the filtered reaction mixture (Table 3) and the quality of the product (Table 4) obtained as a result of using the reaction mixture several times varied only very little; in particular the powder properties of the product did not produce any significant changes.

[0043] Table 3: Test data for filtered reaction mixture

[0044] PVC type: S-PVC, K valu...

Embodiment 2

[0048] S-PVC, K value 68

[0049] Polymerization of vinyl chloride was carried out in an aqueous reaction mixture at a temperature of 53° C. in a reactor using the method shown in FIG. 1 . After degassing, the resulting reaction mixture was mechanically dehydrated in a centrifuge and the polymer product was isolated. The reaction mixture from the centrifuge was filtered through a conventional plate module. The filtered solids were removed and the filtered reaction mixture was returned to the reactor and reused for further polymerization. Repeat the steps described several times for this PVC type. The quality of the filtered reaction mixture (Table 5) and the quality of the product (Table 6) resulting from using the reaction mixture several times varied only very slightly; in particular the powder properties of the product did not undergo any significant changes.

[0050] Table 5: Test data for filtered reaction mixture

[0051] PVC type: S-PVC, K value 68

un...

Embodiment 3

[0055] S-PVC, K value 70

[0056] Polymerization of vinyl chloride was carried out in an aqueous reaction mixture at a temperature of 53° C. in a reactor using the method shown in FIG. 2 . After degassing, the resulting reaction mixture was mechanically dehydrated in a centrifuge and the polymer product was isolated. The reaction mixture from the centrifuge was filtered through a conventional tubular module. The filtered solids were removed and the filtered reaction mixture was returned to the reactor and reused for further polymerization. Repeat the steps described several times for this PVC type. The quality of the filtered reaction mixture (Table 7) and the quality of the product (Table 8) resulting from using the reaction mixture several times varied only very slightly; in particular the powder properties of the product did not undergo any significant changes.

[0057] Table 7: Test data for filtered reaction mixture

[0058] PVC type: S-PVC, K value 70

u...

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Abstract

The present invention relates to a process for the polymerization of vinyl-containing monomers such as monomeric vinyl halides in a reaction mixture which produces less waste.

Description

technical field [0001] The present invention relates to a process for the polymerization of vinyl-containing monomers such as vinyl halides in a reaction mixture which produces less waste. Background technique [0002] The polymerization of vinyl-containing monomers such as from vinyl chloride to polyvinyl chloride is usually carried out using a suspension polymerization method and carried out discontinuously in completely deionized water, for example in Technical progress for PVC production, Progress in Polymer Science 27 (2002), ELSEVIER , 2070 / 2071, and Harold Sarvetnick, Polyvinyl Chloride, pp. 42 / 43, vanNostrand Reinold Company, New York 1969 and Encyclopedia of PVC, Vol. 1, p. 74, Nass / Heiberger, Marcel Dekker, New York 1986, and described in http: / / www.solvin.com / production / producti.htm. The resulting suspension typically has a solids content of 25-40%. Usually after the PVC suspension is degassed and dehydrated in a decanter, the residual water content in the PVC p...

Claims

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Application Information

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IPC IPC(8): C08F2/01C08J11/02C08F2/18C08F14/06
CPCB01J2219/00006C08F14/06C08J11/02Y02P20/582C08F2/16C08F2/10C08F2/18C08F6/16
Inventor U·沃伊克H·克利佩特J·基施纳P·卡默霍费尔
Owner VINNOLIT GMBH & CO KG
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