Albemarle Corporation

Ethyl Corporation

Albermarle Corporation

Alvin E Harkins, Jr

Thanikavelu Manimaran

Bonnie G McKinnie

Hassan Y Elnagar

Richard A Holub

James E Torres

Robert M Moore, Jr

Keith G Anderson

Wesley D Blank

Thomas J Callender

B Gary McKinnie

Samuel H Dubois

Layne W Summers

A process for the production of an aliphatic bromide in which the bromine atom is attached to a terminal carbon atom, which process comprises continuously feeding olefin having a terminal double bond, gaseous hydrogen bromide, and a molecular oxygen-containing gas into a liquid phase reaction medium comprised of aliphatic bromide to cause anti-Markovnikov addition of HBr to terminal olefin, the feeds being proportioned and maintained to provide a molar excess of hydrogen bromide relative to terminal olefin in the range of about 1 to about 5 percent, and a molar ratio of molecular oxygen to terminal olefin of less than 0.005. The process is especially suited for production of n-propyl bromide.

Process for producing n-propyl bromide or other aliphatic bromides

Described is a process for separating an organic phase comprising mainly propyl bromide from a crude reaction mixture formed by free-radical catalyzed hydrobromination of propylene with hydrogen bromide. The process comprises (A) feeding cold water into an upper or mid-portion of a packed column; (B) concurrently feeding the crude reaction mixture into an upper portion and/or mid-portion of the column so that the water contacts the crude reaction mixture; to form a mixture of (i) an acidic aqueous phase comprising aqueous hydrogen bromide and (ii) an organic phase comprising propyl bromide; (C) withdrawing the resultant phases from said column, at a rate comparable to the feeds being made into the column; and (D) separating the phases to form an upper acidic aqueous phase comprising aqueous hydrogen bromide superposed on a lower liquid organic phase comprising propyl bromide, and separating these upper and lower phases from each other.

Separation and/or recovery of propyl bromide

The present invention relates to a method for recovering antimony catalysts wherein the formation of insoluble solids is reduced.

Polymer halogenation process with catalyst recovery

A process for brominating a styrenic polymer in an organic solvent in the presence of an antimony trihalide catalyst such that a reaction mass containing brominated styrenic polymer in an organic phase is formed is improved by mixing hydrochloric acid or hydrobromic acid, or both, with said reaction mass at least once to extract antimony catalyst residues from said reaction mass as an acidic aqueous phase. Preferably, catalyst residues are recovered from the acidic aqueous phase and still more preferably, recovered antimony trihalide catalyst residues are recycled to constitute at least a portion of the antimony trihalide catalyst used in preparing the brominated styrenic polymer.

Recovery of antimony catalyst residues from bromination reaction mixtures

Concentrated liquid biocide compositions are produced by: A) feeding (a) bromine atoms and chlorine atoms in the form of (i) one or more of BrCl, (ii) Br , and (iii) Cl into (b) water containing sulfamate anions, or feeding each of (a) and (b) into a reaction vessel, such that the numerical ratio of the total number of bromine atoms fed to the total number of chlorine atoms fed is in the range of about 0.7:1 to about 1.7:1; and B) providing enough alkali metal base in the mixture being formed in A) to keep the pH of such mixture in the range of about 7-11 during all or substantially all of the time feeding in A) is occurring, the amounts of (a) and (b) used being amounts that form an active-bromine-containing solution in which (i) the active bromine content is 50,000 ppm or more, and (ii) the atom ratio of nitrogen to active bromine originating from (a) and (b) is greater than about 0.93; and wherein if any sulfate is present in the solution as formed, the molar ratio of sulfate to sulfamate in the solution is less than about 0.2.

Concentrated aqueous bromine solutions and their preparation

This invention relates, inter alia, to a process for the production of tetrabromobisphenol-A by the bromination of bisphenol-A and/or underbrominated bisphenol-A, which process features: a water and water-miscible organic solvent reaction medium; a relatively high reaction temperature; and the presence, in the reaction medium, of both (i) excess unreacted Br,during the feed of bisphenol-A to the reactor, and (ii) sufficient HBr to protect the tetrabromobisphenol-A produced against undesirable color formation. Tetrabromobisphenol-A precipitates from the reaction mass and is easily recovered. Product of high purity (97% or more) and very low color (APHA of 50 or less) can be produced, even when using large excesses of bromine in the reaction.

Process for the preparation of tetrabromobisphenol-A

This invention relates, inter alia, to a process for the production of tetrabromobisphenol-A by the bromination of bisphenol-A and/or underbrominated bisphenol-A, which process features: a water and water-miscible organic solvent reaction medium; a relatively high reaction temperature; and the presence, in the reaction medium, of both (i) excess unreacted Br,during the feed of bis-phenol-A to the reactor, and (ii) sufficient HBr to protect the tetrabromobisphenol-A produced against undesirable color formation. Tetrabromobisphenol-A precipitates from the reaction mass and is easily recovered. Product of high purity (97% or more) and very low color (APHA of 50 or less) can be produced, even when using large excesses of bromine in the reaction.

Alpha-olfins containing about 6-14 carbon atoms are made in a dual displacement loop ethylene/tri-lower alkyl chain growth process which includes, in one closed loop, an initial ethylene/triethyl aluminum (TEA) chain growth, C.sub.2-14 olefin separation, 2-stage ethylene displacment, C.sub.2-12 olefin separation and recycle of residual TEA and higher olefins back to the initial ethylene/TEA chain growth. A second closed loop starts with the same ethylene/TEA chain growth product followed by C.sub.4-14 olefin separation, C.sub.4-8 olefin displacement on the bottoms from C.sub.4-14 olefin separation, ethylene chain growth on the C.sub.4-8 olefin displacement product and recycle of this ethylene displacement product back to the olefin separation stage following the initial ethylene/TEA chain growth reaction.

Alpha-olefin process

A rotary drum filter apparatus comprising a rotary drum, a plurality of axial, parallel slots spaced circumferentially around the drum, a filter cloth positioned peripherally around the drum and portions thereof extending into each of the axial slots, flexible metal means inserted into each of the slots over the portion of the filter cloth extending into the slots and caulking means for holding each of the metal means and each of said portions of said filter cloth in a locked position in their respective axial slots. The metal means may comprise a stranded metal cable wherein caulking means are unnecessary.

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Baton Rouge, LA, United States of America

Alvin E Harkins, Jr