Albemarle Corporation

About: Albemarle Corporation is a company organization based out in Baton Rouge, Louisiana, United States. It is known for research contribution in the topics: Catalysis & Alkyl. The organization has 645 authors who have published 701 publications receiving 7583 citations.

Process For Producing N-Halogenated Hydantoins

Abstract: This invention provides a process for the N-halogenation of at least one 5-hydrocarbyl hydantoin and/or at least one 5,5-dihydrocarbyl hydantoin. The process comprises concurrently feeding into a reaction zone (i) water, inorganic base, and 5,5-dimethylhydantoin, these being fed separately and/or in any combination(s), (ii) a separate feed of a brominating agent, and (iii) a separate feed of a chlorinating agent, in proportions such that during all or substantially all of the time the concurrent feeding is occurring halogenation of the 5-hydrocarbyl hydantoin and/or 5,5-dihydrocarbyl hydantoin occurs and resultant halogenated product precipitates in the liquid phase of an aqueous reaction mixture, and in which the pH of the liquid phase is continuously or substantially continuously maintained in the range of about 2.0 to about 8.0 during all or substantially all of the time the concurrent feeding is occurring. Also provided by this invention is a composition of matter which is a halogenated 5-hydrocarbyl hydantoin or a halogenated 5,5-dihydrocarbyl hydantoin, which is a mixture of the 1,3-dibromo-, 1,3-dichloro-, and/or N,N′-bromochloro-species of the halogenated hydantoin.

Processes for conjointly producing bromine and calcium chloride

Abstract: Processes are provided for conjointly producing Br2 and a concentrated aqueous solution containing at least about 5 wt% CaCI2, based on the weight of the concentrated aqueous solution, from an HBr-rich recycle stream and a feed brine dilute in CaCI2 wherein the aqueous HBr-rich stream is produced from an HBr-rich recycle stream and a portion of the feed brine Such processes can comprise feeding the HBr-rich recycle stream and a liquid comprising a portion of the feed brine, either together or separately to an HBr absorption tower; producing an aqueous HBr-rich stream in the HBr absorption tower; feeding the aqueous HBr-rich stream and, optionally, a portion of the feed brine to a bromine tower; oxidizing bromide moieties within the bromine tower with CI2 to produce Br2; recovering Br2 from the bromine tower; removing a bromide- depleted bottoms from the bromine tower, such bottoms containing HCI; adding a Ca++ source to the bromide-depleted bottoms to convert substantially all of the HCI in the bottoms to CaCI2, and, as necessary, removing water from the treated bottoms to produce the concentrated aqueous solution

Fine aluminium hydroxide

Abstract: The invention relates to an aluminium hydroxide having an average particle size in the range of 2 to 4 µm and a specific surface area according to BET in the range of 8 to 12 m 2 /g which is obtained by ball-milling.

Separation of aluminum alkyls from olefins using polyphenylene oxide membrane

Abstract: A process for separating a mixture of aluminum alkyl and alpha-olefin comprises contacting, under an elevated pressure of at least about 300 psig, an organic solvent stable, polyphenylene oxide-derived membrane with said mixture and recovering as the permeate an alpha-olefin fraction which contains a lower concentration of aluminum alkyl than in the starting mixture.

Synthesis of cycloalkyldiarylphosophines

Abstract: Phosphines having two aryl groups and one alkyl-substituted cycloalkyl group bonded to a phosphorus atom are formed by reacting an alkali metal diarylphosphide with a monoalkyl- or polyalkyl-substituted cycloalkyl mesylate or tosylate in which an alkyl group is in the 2-position, in a liquid reaction medium in which these reactants are soluble. This process avoids complications associated with prior known process technology for producing such phosphines. The phosphines are useful as ligands for making noble metal catalysts.