First Chemical Corporation

The University of Southern Mississippi

Arthur C Bayer

Robson F Storey

Sudhakar Dantiki

Earl G Alley

Charles U Pittman, Jr

Alan Daniel Farmer

Earl G Adams

Brenda J Hook

Lichang Wang

Anthony C Maliyackel

Harold Greenfield

Melissa L Hogue

Blends of diaminoisopropylbenzene (DAIBP) and diaminoethylbenzene (DAEB) are provided for curing epoxy resins. The cured epoxy resins have increased tensile strength and slightly lower glass transition temperatures as compared with resins cured with either diamine alone.

Ring-alkylated m-phenylene diamine blends for use in curing epoxy resins

A two-stage process for the co-production of aniline and m-phenylenediamine where, in the first stage, benzene, nitric acid, and sulfuric acid are reacted in a liquid phase to produce in greater amounts nitrobenzene (approximately 70%) and m-dinitrobenzene (approximately 30%), and in lesser or trace amounts o-dinitrobenzene and p-dinitrobenzene, and water; and in the second stage the products of the first stage are reacted with hydrogen in the liquid phase to produce aniline (approximately 70%) and m-phenylenediamine (approximately 30%) in greater amounts, and o-phenylenediamine and p-phenylenediamine in lesser amounts, and water. The reaction products are separated by distillation. The first stage of a preferred embodiment of the process is characterized in that a concentrated mixture of nitric acid and sulfuric acid are fed along with mononitrobenzene to a first reactor for producing dinitrobenzene, and then the dilute acid mixture recovered from this first reactor is fed along with benzene to a second reactor for producing the mononitrobenzene used as a reactant in the first reactor. The second stage, which provides the aniline and m-phenylenediamine, is characterized in that the hydrogenation is carried out in the liquid phase with the unpurified reaction products from the first stage. Preferably, the second stage reaction is carried out utilizing a palladium-on-carbon catalyst in an amount of from 0.006 to 0.25 wt. % based on the total weight of the first stage reaction product mixture. The process is applicable to the co-production of other aromatic mono- and diamines.

Co-production of an aromatic monoamine and an aromatic diamine directly

The selective ring-alkylation of anilines comprising providing a mixture of a lower alkanol and an aniline, exposing said mixture to a temperature of from 300.degree. C. to 500.degree. C., preferably from 350.degree. C. to 450.degree. C., in the presence of an acidic Y-type zeolite is described. The Y-type zeolites are predominantly selective to the formation of para-alkylanilines.

Selective C-alkylation of aniline in the presence of zeolite catalysts

Blends of diaminoisopropylbenzene (DAIPB) and diaminoethylbenzene (DAEB) are provided for curing epoxy resins. The cured epoxy resins have increased tensile strength and slightly lower glass transistion temperatures as compared with resins cured with either diamine alone.

The selective N-alkylation of anilines comprising providing a mixture of a lower alkanol and an aniline, exposing said mixture to a temperature of from 250.degree. C. to 350.degree. C. in the presence of an acidic zeolite having a pore size of from 6 to 8 angstroms with a three-dimensional tubular shape, such as S-115 zeolite, is described. These zeolites are predominantly selective to the formation of N-alkylanilines.

Selective N-alkylation of aniline in the presence of zeolite catalysts

A process for selectively recovering a nitrophenolic by-product from nitration waste water in substantially pure form by solvent extraction is provided. The pH of the waste water is adjusted using an acid to affect the solubility of a particular nitrophenolic by-product in the waste water so that the by-product is selectively separable from the other components of the nitration waste water by solvent extraction.

Selective recovery of a nitrophenolic by-product from nitration waste

A process of selectively recovering a nitrophenolic by-product, namely 2,4-dinitrophenol and picric acid, from nitration waste water in substantially pure form through the control of the solution pH of the nitration waste water and subsequent precipitation is provided. By adjusting the solution pH of the nitration waste water with an acid to a pH in the range of from about 4.0 to 0.5, the solubility of the selected nitrophenolic by-products is affected and the crystal formation of the individual by-products controlled.

Method of promoting the cure of unsaturated polyester resins with a peroxide initiator at room or below room temperatures (low temperatures) by including as a promoter N,N-dimethyl-p-toluidine (DMPT) or a blend of DMPT and N,N-dimethyl-m-toluidine (DMMT) and to the polyester composition containing such promoter. The use of the DMPT or blend of DMPT and DMMT as a promoter provides a fast cure at low temperatures without loss of physical properties of the cured resins.

Growing community of inventors

Ocean Springs, MS, United States of America

Arthur C Bayer