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Lithium reduction in styrenic polymers

A technology of styrene and polymer, which is applied in the field of removal of ion lithium residues, and can solve problems such as being unable to be broken

Inactive Publication Date: 2011-04-27
ALBEMARLE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The emulsion cannot be broken up when passing through the coalescing filter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Anionic polymerization of styrene to form polystyrene by delivering styrene (0.7 mol) to a solution of 1-BuLi (0.0162 mol) and THF (0.0486 mol) in cyclohexane (70 g) at 30-53°C . Delivers water within 4 minutes (per mole of active polymer or 3 mol) to deactivate ongoing polymerization. Then more water (21 g) was added. The resulting mixture was stirred at 57-64°C for 10 minutes. After allowing the mixture to stand for 15 minutes, the aqueous and organic phases were separated; the organic phase (containing polystyrene and suspended water) was found to contain 88 ppm of The mixture (consisting of organic and aqueous phases) was then heated to 110° C. in an autoclave with stirring. After 30 minutes, the organic phase contained 34ppm of After an additional hour of stirring in the autoclave at 130 °C, the organic phase contained 18 ppm of

[0026] At least in theory, one mole of living polymer is produced per mole of organolithium initiator (in this example, 1-BuL...

Embodiment 2

[0028] Contains 104ppm Polystyrene emulsion cyclohexane solution (40% by weight; Mw 10,000; prepared by anionic polymerization method similar to Example 1), and its initial water washing (accounting for 15% by weight of anionic polystyrene solution; 1,170ppm of ) were combined and loaded into a pressure cooker. Under pressure, the liquid mixture was heated to 130°C and stirred at 130°C. After one hour, the organic phase contained 37ppm of In the pressure cooker, stirring for another hour at 150°C, the resulting organic phase contained 24ppm

[0029] It can be understood that the reactants and components mentioned by chemical names or general formulas anywhere in this document, no matter they are mentioned in singular or plural reactants, solvents, etc.) other substances mentioned were present prior to exposure. It is not important that the initial chemical changes, transformations and / or reactions, if any, occur in the synthetic mixture or solution or reaction medium...

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Abstract

This invention provides a process which comprises heating a lithium-containing mixture to one or more temperatures of at least about 90 DEG C and at one or more pressures sufficient to maintain substantially the entire mixture in the liquid phase. The lithium- containing mixture which comprises water, lithium ions, at least one liquid saturated hydrocarbon, and at least one styrenic polymer formed by anionic polymerization. The amount of water is at least about 10 wt% relative to the weight of the styrenic polymer, and the styrenic polymer has a weight average molecular weight of at least about 1000.

Description

technical field [0001] The present invention relates to the removal of ionic lithium residues from styrenic polymers prepared by anionic polymerization methods. Background technique [0002] Polystyrene has many applications in the production of plastic products and materials. An important application of anionic styrenic polymers is as a raw material for the production of brominated styrenic polymers. Brominated anionic polystyrene is known to be a very useful flame retardant for applications in thermoplastics such as polybutylene terephthalate, polyethylene terephthalate and nylon. Organolithium compounds are commonly used as initiators in the synthesis of anionic styrenic polymers such as anionic polystyrene. In order to effectively brominate the anionic styrenic polymers, it is necessary to effectively remove ionic lithium catalyst residues from the polymers. When polystyrene is produced by anionic polymerization and in the presence of lithium ions, lithium ions remain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F6/02
CPCC08F6/02C08L25/04C08F12/08
Inventor 龙尼·W.·利恩约翰·F.·巴尔霍夫
Owner ALBEMARLE CORP
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