Allied Chemical Corporation

Allied Corporation

The Dow Chemical Company

Bruce E Kurtz

Robert H Fitch

Edmund W Smalley

Gary A Harpell

Gordhanbhai N Patel

Rustom P Poncha

Adam L Skovrinski

Anatoli Omelian

Bhaskar Bandyopadhyay

James M Lesco

Albert A Birkmaier

Eric H Larson

Noel Y Rothmayer

John I Choi

Bronislaw B Smura

Joel P Guptill

Walter E Sommerman

Lakshmi P Sharma

John R Van Atta

Wayne S Amato

A process for consecutive-competitive gas phase halogenation of organic compounds, i.e. alkanes, alkenes and benzene, alkyl benzenes and alkenyl benzenes containing labile hydrogens and having no more than 12 and 9 carbon atoms, respectively, in a thin reaction film on the surface of a porous barrier for production of highly halogenated products by substantial suppression of diffusion of partially halogenated intermediates away from the reaction film is disclosed.

Process for consecutive competitive gas phase reaction

This invention relates to a process for conditioning the surfaces of natural and synthetic plastic materials for electroless plating of a metal coating thereon by exposing such materials to an atmosphere comprising an effective amount of ozone and thereafter contacting said exposed materials with an effective amount of a conditioning solvent, such as an aqueous solution of sodium, potassium or lithium hydroxide.

Pretreatment of plastic materials for metal plating

A cathode assembly for use in an electrolyzer cell is provided which comprises at least one separating means adjacent to a face of said cathode assembly and comprising a fluid-impervious material and extending diagonally upwards from a point on a first side of said cathode to a point short of a second side opposite the first side of said cathode, said first separating means having a positive monotonic slope with reference to said first side and to a third side adjacent to said first side and thereby separating said face into at least two interconnected regions. The preferred embodiment of the cathode assembly comprises two separating means equipped with downwardly disposed flanges affixed to an edge of said separating means and extending substantially along the full length of said separating means. A process employing the cathode assembly is also disclosed.

Channel flow cathode assembly and electrolyzer

A process for the recovery of soluble alumina values from alumina-bearing ores comprising simultaneously contacting a stream containing an effective amount of a reducing agent such as SO.sub.2 and a stream containing an effective amount of an oxidizing agent such as Cl.sub.2 with an aqueous slurry of the alumina-bearing ores for a time sufficient to remove at least about 50 weight percent of the soluble alumina values from said ores is disclosed.

Recovery of soluble alumina values from alumina bearing ores

A process is disclosed for producing chlorine and caustic soda in an electrolytic membrane cell which comprises providing a pressure differential between the anode compartment and the cathode compartment sufficient to prevent substantial contact of the membrane with the anode, and reducing fluctuations in the pressure differential by allowing depleted sodium chloride brine and chlorine gas to flow freely from the anode compartment to a brine collection point. Also, the caustic soda and hydrogen gas produced in the cathode compartment are allowed to flow freely from the cathode compartment to a caustic soda collection point.

Electrolytic production of chlorine and caustic soda

An electrolysis process is disclosed in which catholyte is transferred serially from one cell, in a bank of a plurality of cells, to the cathode compartment of a succeeding cell in the bank. The transfer is accomplished by means of a gas-lift in which gas, present in the cathode compartment rises through a confined space, which is dimensioned such that the gas serves to lift the catholyte upward to a point where the gas and liquid separate and the liquid catholyte is allowed to fall freely to a collection point from which it is introduced into the cathode compartment of a succeeding cell.

Electrolysis of aqueous salt solutions

A cathode assembly for a plural cell electrolyzer is provided which comprises a rigid cathode support joined to a cathode by a first set of connecting members and to an anode in an adjacent cell by a second set of connecting members. The cathode support and first set of connectors enable the cathode to maintain an essentially flat surface. The support and second set of connectors stabilize the cell frame and enable the anode likewise to maintain a flat surface. Thus, the electrodes in a cell may be set accurately flat and parallel to minimize the interelectrode gap and the cell voltage drop due to the electrolyte path, and, consequently, to improve cell efficiency.

Cathode assembly for plural cell electrolyzer

Process is provided for isothermal chlorination of certain hydrocarbons wherein a gas containing the selected hydrocarbon is passed to a first elongated reaction zone, and a gas containing chlorine is passed into a second elongated gas zone positioned along said first zone, said first and second zones being separated by a porous member. The pressure of gases within the second zone is maintained in excess of the pressure in the first zone for diffusion of chlorine through the porous member into the first zone, which is maintained under conditions sufficient to effect reaction therein of at least a portion of diffused chlorine with the hydrocarbon for production of the desired chlorinated hydrocarbon. The reaction product containing the desired chlorinated hydrocarbon is discharged from the first zone.

Process and apparatus for isothermal chlorination of hydrocarbons

A process for producing chlorine and caustic soda is described involving a bank of electrolytic membrane cells arranged for series catholyte flow. Power efficiency is improved by maintaining at least two of the initial cells in the bank in parallel catholyte flow, combining the catholyte streams from such initial cells and introducing the combined catholyte into the cathode compartment of one or more succeeding cells in the bank.

Process for producing chlorine and caustic soda

A cell frame transfer cart for vertical and horizontal displacement of a segment of a plural cell electrolyzer is comprised of spaced main and secondary platforms, a vertical displacement member disposed intermediate the platforms, and a support member for supporting the main platform and permitting horizontal displacement of a selected segment of a plural cell electrolyzer when the vertical displacement member is actuated. An assembly including the present transfer cart, and a method for disassembly of a plural cell electrolyzer, are also described.

Apparatus for disassembly of a plural cell electrolyzer

A process is described for producing bromine which comprises heating a bromide salt at a temperature of about 500.degree. to 1000.degree. C in the presence of an oxygen-containing gas, silicon dioxide and an oxidation catalyst preferably selected from the group consisting of B.sub.2 O.sub.3, CaO, Fe.sub.2 O.sub.3, Al.sub.2 O.sub.3, Na.sub.2 B.sub.4 O.sub.7, ZnO, MgO, MnO.sub.2, TiO.sub.2, NaNO.sub.2 and mixtures thereof. A by-product silicate can optionally be formed which is useful in the glass industry. The process is useful in many industrial applications, especially in the formation of ethylene dichloride, an intermediate used in the manufacture of vinyl chloride monomer, which involves reacting ethylene with bromine to produce ethylene dibromide, reacting the ethylene dibromide with a chloride salt to produce ethylene dichloride and a bromide salt, and oxidizing the bromide salt to bromine for reaction with ethylene to complete the cycle.

Process for producing bromine

A retaining and restraining support structure for a plural cell electrolyzer is comprised of a sleeper assembly for supporting the electrolyzer cell along its longitudinal dimension, and a tension bar assembly for maintaining each of the cells in a substantially vertical plane, while insuring good mechanical connection and fluid communication therebetween, wherein the tension bar assembly includes plural longitudinal, adjustable tension bars and diagonal, adjustable tie bars.

Support structure for plural cell electrolyzer

A cyclic process having reduced hydrocarbon emission is provided for oxyhydrochlorination of ethylene to produce ethylene dichloride employing substantially pure oxygen as feed to the oxyhydrochlorination unit and recycling a major portion of the residual gas stream from which ethylene dichloride has been recovered as condensate, wherein reactant feed rates are adjusted to maintain recycle gas stream composition within specified limits.

Cyclic ethylene oxyhydrochlorination process with reduced hydrocarbon

Process is provided for removal of chloroprenes as impurities from ethylene dichloride streams formed in the production of vinyl chloride by the thermal cracking of ethylene dichloride. The ethylene dichloride stream is subjected to distillation in a distillation zone to which free chlorine gas is introduced, thereby chlorinating the chloroprenes contained therein and forming higher boiling chlorocarbons as reaction products. The higher boiling chlorocarbons, together with ethylene dichloride, may be removed as bottoms and passed to a second distillation zone for separation of ethylene dichloride from the higher boiling impurities, thereby producing a substantially pure ethylene dichloride which may be recycled to the cracking step.

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Marcellus, NY, United States of America

Bruce E Kurtz