Abstract: A process for the continuous epoxidation of propene with hydrogen peroxide in the presence of a titanium silicalite catalyst and a methanol solvent, wherein the catalyst is periodically regenerated by washing with a methanol solvent at a temperature of at least 100° C. and the epoxidation reaction is carried out for periods of more than 300 h between two regeneration steps.

Abstract: A continuous process for the epoxidation of olefins with hydrogen peroxide in the presence of a heterogeneous catalyst promoting the epoxidation reaction, whereby the aqueous reaction mixture contains i) an olefin; ii) hydrogen peroxide; iii) less than 100 wppm of alkali metals, earth alkali metals, both irrespective whether in ionic, complex or covalently bonded form, bases or cations of bases having a pkB of less than 4.5, or combinations thereof; and, iv) at least 100 wppm of bases or cations of bases having a pkB of at least 4.5 or combinations thereof, whereby the wppm are based on the total weight of hydrogen peroxide in the reaction mixture.

Abstract: A process for the catalytic epoxidation of olefins in the presence of a titanium containing zeolite catalyst and a polar solvent whereby the deactivation of the catalyst upon recycling of the solvent has been considerably reduced. In the process one or more nitrogen containing compounds are introduced at some stage, a solvent stream is recovered, treated to contain less than 50 wppm nitrogen in the form of organic nitrogen compounds and at least a part of it is recycled to the epoxidation step. Also disclosed is a process for the catalytic epoxidation of propene which integrates the treatment and recycle of the solvent into the workup of the reaction mixture.

Abstract: An aqueous hydrogen peroxide solution containing i) less than 50 wppm alkali metals, alkaline earth metals or combinations thereof in total, irrespective whether the alkali or alkaline earth metals are present in cationic or complex form; ii) less than 50 wppm of amines having a pkB of less than 4.5 or the corresponding protonated compounds in total; and iii) at least 100 wppm anions or compounds that can dissociate to form anions in total, where the wppm are based on the weight of hydrogen peroxide and the concentration of hydrogen peroxide is more than 50% by weight based on the total weight of the hydrogen peroxide solution. A process for preparation of said hydrogen peroxide solution and the use of said solution in a process for epoxidation of olefins is also disclosed.

Abstract: A process for the epoxidation of olefins which includes

Abstract: The invention relates to the production of hexamethylene diamine from butadiene. The method comprises the successively performed stages of: (i) a catalytic epoxidation of butadiene to 1,2-epoxy-3-butene; (ii) a basically catalyzed addition of hydrogen cyanide to butadiene monoxide to form a reaction mixture containing 3-hydroxy-4-pentene nitrile (3HPN) and 2-hydroxymethyl-3-butene nitrile (2HMBN); (iii) an acidically catalyzed dehydration of the cyanohydrines 3HPN and 2HMBN of stage (ii) to cis/trans-pentadiene nitrile (PDN); (iv) a basically catalyzed addition of the products of stage (iii) to form cis/trans-1,4-dicyanobutene-1 and -2 (DCB); and (v) a catalytic hydrogenation of the isomeric cis/trans-1,4-dicyanobutene of stage (iv) to hexamethylene diamine.