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Process for making brominating agents in flow

A brominating agent, bromide technology, applied in organic chemical methods, chemical instruments and methods, bromine/hydrogen bromide, etc., can solve problems such as difficult to control heat

Inactive Publication Date: 2019-05-21
AGFA NV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Third, since both oxidation and bromination reactions are very exothermic and generate heat simultaneously, it is difficult to control the heat generated in these procedures

Method used

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  • Process for making brominating agents in flow
  • Process for making brominating agents in flow

Examples

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Embodiment

[0048] All materials used in the following examples were readily obtained from standard sources such as Sigma-Aldrich (Belgium) and Acros (Belgium) unless otherwise stated. The target compounds used in the examples are merely examples of the present invention.

[0049] 1. Bromination with hypobromite

[0050] Sodium hypobromite synthesis in flow

[0051] Reaction scheme:

[0052]

[0053] Reaction procedure:

[0054] • Two aqueous solutions are prepared and combined in a flow reactor to produce a hypobromite-containing solution:

[0055] Solution A contained 40% w / w sodium bromide in water (400 grams sodium bromide + 600 grams water). Sodium bromide was purchased from Bromine Compounds Ltd (Israel) and dissolved in demineralized water to obtain a clear solution.

[0056] Solution B is a commercially available concentrated bleach solution (13% by weight sodium hypochlorite in water, as determined by titration on Agfa Materials, product from Acros, Belgium, freshly used)...

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PUM

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Abstract

The invention relates to a process for making a brominating agent comprising the step of continuously feeding a bromide source and an oxidizing agent into a continuous flow reactor.

Description

field of invention [0001] The present invention relates to a process for the in-flow preparation of brominating agents starting from a bromide source. Background of the invention [0002] In organic synthesis, halogen atoms, such as fluorine, bromine, chlorine or iodine atoms, are often introduced at various positions in chemical compounds in order to modify the properties of these compounds in a desired manner. Brominated compounds are widely used as, for example, biocides, flame retardants, dyes and pharmaceuticals. [0003] The general synthetic method that bromine atom is introduced into organic compound comprises organic compound and bromine source or brominating agent (such as elemental bromine (Br 2 ), hypobromite (BrO - ), monobromomalononitrile (monobromomalonitrile) and / or N-bromosuccinimide (NBS)). In a typical procedure, the compound to be brominated and the bromine source are combined in a suitable solvent. Via a bromination reaction, the brominating agent w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/09C01B11/20
CPCC01B7/096C01B11/20B01J4/001B01J19/0066B01J19/18B01J2219/00033B01J2219/00164B01J2219/00761C07B39/00
Inventor W.德莫B.卡普因斯M.莫恩斯C.史蒂芬斯
Owner AGFA NV
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