Bromine Compounds Limited

Jakob Oren

Ron Frim

Joshua Hermolin

Michael Zviely

Nasif Yassin

Michael R Peled

Joseph Zilberman

Mark Gelmont

Nurit Kornberg

David Feldman

Michel Adda

Smadar Hini

Dorit Canfi

Hugo Keselman

Dov Beruben

Dov Zamir

Joseph Bercovici

Leah Golan

Hugo Kesselman

This invention provides a process for obtaining propargyl bromide in high yield from propargyl alcohol and phosphorus bromide, in the form of a stable composition with alkylbromide.

Manufacturing of stabilized propargyl bromide

A continuous process of preparing bromopicrin is disclosed. The process is effected by transferring a continuous flow of a first mixture and a continuous flow of a second mixture into a first reactor, the first mixture containing nitromethane and bromine and the second mixture containing an aqueous solution of an alkaline substance, to thereby obtain a reaction mixture which comprises bromopicrin in said first reactor; and collecting the bromopicrin from the reaction mixture. Highly pure bromopicrin obtained by this process is also disclosed.

Continuous process of preparing bromopicrin

Process of preparing high purity bromopicrin, and high purity bromopicrin produced therefrom. Providing a mixture of nitromethane and bromine, and preferably water, and absent of organic solvent. Adding an aqueous solution of an alkaline substance to the mixture, thereby providing a reaction mixture containing bromopicrin, the adding performed such that no excess of the alkaline substance occurs in the reaction mixture during the adding. Collecting the organic phase (containing the bromopicrin) from the reaction mixture. No need for subjecting the organic phase of the reaction mixture to distillation or extraction, for obtaining near quantitative yield of bromopicrin having purity of at least equal to or greater than 96 weight percent. Process parameters controlling selectivity of reaction forming bromopicrin are molar ratio of bromine and nitromethane in the mixture; reaction temperature while bromopicrin is formed; concentration of the alkaline substance in the aqueous solution; and reaction time.

Process of preparing bromopicrin

Polybrominated bisaryl compounds containing bromomethyl or bromomethylene groups are provided, as well as flameproof polymeric formulations comprising the compounds. The novel compounds exhibit a good thermal stability, and are particularly suitable for flame-retarding polystyrene thermoplastic foams. A process for making the polybrominated bisaryl compounds is also provided.

Flame retardant bromobenzyl systems

The present invention relates to a styrenic polymer composition comprising a flame-retardant effective amount of a compound of formula (I): (CHY)CHX, wherein X is Cl or Br; Y is Cl or Br; and n is an integer betweenand; or a mixture of two or more of said compounds of formula (I) or their homologues and derivatives or other Br-FRs.

Flame-retardant polystyrenes

Process for the preparation of para-fluorophenol

Process for the production of p-bromofluorobenzene by the bromination of fluorobenzene, characterized in that the bromination is carried out with liquid bromine at temperatures below 0.degree. C.

Process for the preparation of p-bromofluorobenzene

A process for the preparation of 5-hydroxyisophthalic acid (5-HIPA) that comprises hydrolyzing a starting material chosen from among 5-bromoisophthalic acid (5-BIPA), mixtures of 5-BIPA and dibromoisophthalic acid isomers, and salts of thereof in an aqueous alkaline solution, in the presence of a catalytically effective amount of a copper compound catalyst and in a temperature range of between 100.degree. and 270.degree. C.

Process for the preparation of 5-hydroxyisophtalic acids

Compounds of the formula: ##STR1## wherein: n=0 or 1;

Amino phenoxy compounds and process for their preparation

In a process for the preparation of 4,4'-dihydroxybiphenyl of high purity 4,4'-dibromobiphenyl is hydrolized in the presence of a copper compound catalyst, the insoluble materials comprising the catalyst is filtered off from the product mixture, 4,4'-dihydroxybiphenyl is precipitated by adjusting the pH and crude 4,4'-dihydroxybiphenyl separated from the product mixture is fractionally distilled to obtain substantially pure 4,4'-dihydroxybiphenyl.

Process for the preparation of pure 4,4'-dihydroxybiphenyl

In a process for the preparation of mixtures of 2,3-dimethylphenol and 3,4-dimethylphenol a mixture of 2,3-dimethyl-bromobenzene and 3,4-dimethyl-bromobenzene is hydrolized in an aqueous alkaline solution in the presence of a copper compound catalyst of the formula:

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Nesher, Israel

Jakob Oren