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Recovery of hydroxyaromatic compound from aqueous extract solution

A technology for hydroxyaromatic and water extracts, applied in the field of recovering hydroxyaromatic compounds, can solve problems such as complex processing

Inactive Publication Date: 2004-04-14
SABIC INNOVATIVE PLASTICS IP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of phenol feedstock and other hydroxyaromatic compounds formed as by-products or as impurities further complicates the handling of this stream

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 55.2 g of an aqueous extract containing 4.06% phenol and a crude diphenyl carbonate-free reaction mixture containing diphenyl carbonate were extracted with 11.8 g of anisole at 25°C. After one extraction, the aqueous layer contained 1.14% phenol as determined by liquid chromatography.

Embodiment 2

[0020] An aqueous extract of 937.4 g of the crude diphenyl carbonate reaction mixture containing 4.13% phenol and no diphenyl carbonate was extracted with 300.5 g of anisole at 25°C. After the extraction was complete, the two phases were still in contact with each other, the concentration of phenol in the aqueous phase was 0.8%, while the anisole phase contained 10.87% phenol. Then, 811.6 g of the untreated aqueous extract was added to the system, allowed to equilibrate, and the phases were separated (1688.62 g total aqueous phase, 360.88 g anisole phase). The aqueous phase was then separated and extracted with 301.6 g of fresh anisole. The amount of the second anisole phase after this extraction is 314.5 g, and the aqueous phase is 1673.4 g. After this extraction the aqueous phase contained 0.19% phenol and the anisole phase contained 4.12% phenol.

Embodiment 3

[0022] An aqueous extract of 196.2 g of the crude diphenyl carbonate reaction mixture containing 8.14% phenol and no diphenyl carbonate was extracted with 66.1 g of diphenyl carbonate at 85°C. After extraction, the concentration of phenol in the aqueous extract was determined by liquid chromatography to be 2.07%, while the concentration of phenol in the diphenyl carbonate phase was 15.63%.

[0023]Extraction solvents containing one or more hydroxyaromatic compounds can be disposed of by standard methods, such as incineration. The hydroxyaromatic starting material contained in the extraction solvent can also be separated from the solvent by standard methods for further use. Such methods may include evaporation of solvents, crystallization of the hydroxyaromatic starting material, distillation, chromatography, and similar methods of separation and purification. During isolation and purification, the starting hydroxyaromatic compound may be substantially free of any other hydrox...

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PUM

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Abstract

A method for efficiently recovering a hydroxyaromatic compound from aqueous extract streams of diaryl carbonate reaction mixtures, comprises contacting the aqueous extracts with a suitable solvent, preferably diphenyl carbonate or anisole. The aqueous stream may then be further recycled or reclaimed, and the hydroxyaromatic compound isolated from the solvent for disposal or further use.

Description

technical field [0001] The present invention relates to a process for the recovery of hydroxyaromatic compounds from an aqueous extract stream. In particular, the present invention relates to a process for the recovery of hydroxyaromatic compounds from aqueous extract streams resulting from the production of diaryl carbonates. Background technique [0002] Diaryl carbonates, especially diphenyl carbonate, are valuable monomeric precursors for the preparation of polycarbonates by melt transesterification. An advantageous route for the synthesis of diaryl carbonates is the direct carbonylation of hydroxyaromatic compounds by carbon monoxide and oxidizing agents in the presence of catalysts. [0003] A large number of catalysts can be used in the preparation of diaryl carbonates. For example, US Patent 4,187,242 (Chalk) discloses catalysts derived from Group VIIIB metals, namely metals selected from ruthenium, rhodium, palladium, osmium, iridium and platinum, or complexes the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C37/72C07C39/04C07C68/00C07C68/08
CPCC07C68/08C07C68/005C07C68/01C07C69/96C07C37/72
Inventor J·Y·奥弗里
Owner SABIC INNOVATIVE PLASTICS IP BV