Abstract: A process for the preparation of a powder comprising one or more complexing agent salts of the general formula comprises atomizing an aqueous solution comprising the one or more complexing agent salts in the presence of a crystalline fine dust of the same complexing agent salts and a drying step, wherein the concentration of the one or more complexing agent salt is from 10 to 80% by weight, based on the total weight of the aqueous solution, with an upper limit for the average particle diameter of the crystalline fine dust which is lower by at least a factor of 2 than the lower limit of the average particle diameter of the powder obtained after the process, and the fraction of the crystalline fine dust is from 0.1 to 20% by weight, based on the weight of the powder obtained after the process.

Abstract: The present invention relates to methods for the alkylene oxide-free preparation of compositions comprising polyetherols using one or more alkylene carbonates as reactants. The polyetherol compositions prepared according to the invention ideally do not comprise carbonate or comprise almost no carbonate. The present invention also comprises the use of alkylene carbonate for preparing polyetherols or compositions comprising polyetherols and polyetherols or compositions comprising polyetherols prepared by the method according to the invention.

Abstract: A process for the preparation of a spray-dried powder containing at least one glycine-N,N-diacetic acid compound of a formula MOOC—CHR—N(CH2COOM)2, where R is a C1-12-alkyl and M is an alkali metal, the process including: preparing an aqueous solution containing the glycine-N,N-diacetic acid compound; concurrently passing the aqueous solution and air into a spray-drying apparatus; atomizing the aqueous solution by feeding the aqueous solution onto a rotating disk or by compressing the aqueous solution with a pump to a pressure of ?20 bar absolute, to obtain fine liquid droplets; and drying the droplets, to obtain the spray-dried powder, where a temperature gradient between the aqueous solution and the air is in a range from 70 to 350° C., and a content of the glycine-N,N-diacetic acid compound in the aqueous solution is ?84% by weight, based on a total weight of the dry mass.

Abstract: A process is proposed for the preparation of a powder comprising one or more derivatives of glycine-N,N-diacetic acid and/or one or more derivatives of glutamine-N,N-diacetic acid with a degree of crystallinity of a ?30%, starting from an aqueous solution comprising the one or more derivatives of glycine-N,N-diacetic acid and/or the one or more derivatives of glutamine-N,N-diacetic acid in a concentration range from 20 to 60% by weight, based on the total weight of the aqueous solution, where the aqueous solution is concentrated in a first process step in an evaporator with rotating internals, which are arranged at a distance relative to the inside wall of the evaporator of ?1% of the diameter of the evaporator, to give a crystal slurry with a solids concentration in the range from 60 to 85% by weight, based on the total weight of the crystal slurry, and where in a second process step the crystal slurry is left to ripen in a paste bunker and then in a thin-film contact dryer, and where the residence time i

Abstract: A process is proposed for the preparation of a powder comprising one or more derivatives of glycine-N,N-diacetic acid and/or one or more derivatives of glutamine-N,N-diacetic acid with a degree of crystallinity of ?30%, starting from an aqueous solution comprising the one or more derivatives of glycine-N,N-diacetic acid and/or the one or more derivatives of glutamine-N,N-diacetic acid in a concentration range from 20 to 60% by weight, based on the total weight of the aqueous solution, where the aqueous solution is concentrated in a first process step in an evaporator with rotating internals, which are arranged at a distance relative to the inside wall of the evaporator of ?1% of the diameter of the evaporator, to give a crystal slurry with a solids concentration in the range from 60 to 85% by weight, based on the total weight of the crystal slurry, and where in a second process step the crystal slurry is left to ripen in a paste bunker and then in a thin-film contact dryer, and where the residence time in t

Abstract: A process is proposed for the preparation of a powder comprising one or more complexing agent salts of the general formula starting from an aqueous solution comprising the one or more complexing agent salts in a concentration of from 10 to 80% by weight, based on the total weight of the aqueous solution, in a spray-drying process, comprising an atomization step and a drying step, wherein the atomization step is carried out with the addition of crystalline fine dust of the same complexing agent salt(s) as are present in the aqueous solution, or one or more complexing agent salts different therefrom, with an upper limit for the average particle diameter of the crystalline fine dust which is lower by at least a factor of 2 than the lower limit of the average particle diameter of the powder obtained after the process, in a fraction of from 0.1 to 20% by weight, based on the weight of the powder obtained after the process.

Abstract: A process for the preparation of a spray-dried powder containing at least one glycine-N,N-diacetic acid compound of a formula MOOC—CHR—N(CH2COOM)2, where R is a C1-12-alkyl and M is an alkali metal, the process including: preparing an aqueous solution containing the glycine-N,N-diacetic acid compound; concurrently passing the aqueous solution and air into a spray-drying apparatus; atomizing the aqueous solution by feeding the aqueous solution onto a rotating disk or by compressing the aqueous solution with a pump to a pressure of ?20 bar absolute, to obtain fine liquid droplets; and drying the droplets, to obtain the spray-dried powder, where a temperature gradient between the aqueous solution and the air is in a range from 70 to 350° C., and a content of the glycine-N,N-diacetic acid compound in the aqueous solution is ?84% by weight, based on a total weight of the dry mass.

Abstract: A process is proposed for the preparation of a powder comprising one or more derivatives of glycine-N,N-diacetic acid and/or one or more derivatives of glutamine-N,N-diacetic acid with a degree of crystallinity of ?30%, starting from an aqueous solution comprising the one or more derivatives of glycine-N,N-diacetic acid and/or the one or more derivatives of glutamine-N,N-diacetic acid in a concentration range from 20 to 60% by weight, based on the total weight of the aqueous solution, where the aqueous solution is concentrated in a first process step in an evaporator with rotating internals, which are arranged at a distance relative to the inside wall of the evaporator of ?1% of the diameter of the evaporator, to give a crystal slurry with a solids concentration in the range from 60 to 85% by weight, based on the total weight of the crystal slurry, and where in a second process step the crystal slurry is left to ripen in a paste bunker and then in a thin-film contact dryer, and where the residence time in t

Abstract: A process is proposed for producing a free-flowing and storage-stable solid comprising essentially ?-alanine-N,N-diacetic acid and/or one or more derivatives of ?-alanine-N,N-diacetic acid proceeding from a powder of ?-alanine-N,N-diacetic acid and/or one or more derivatives of ?-alanine-N,N-diacetic acid by a. compacting the powder of ?-alanine-N,N-diacetic acid on a roller press to obtain slugs, b. crushing the slugs and c. screening the crushed slugs, which comprises performing the compaction on the roller press with addition of polyethylene glycol with a melting point greater than 35° C.

Abstract: Method of regenerating an Re2O7-doped supported catalyst which has been deactivated by use in the metathesis of a hydrocarbon mixture comprising C2-C6-olefins (C2-6= feed) (deactivated catalyst), which comprises treating the deactivated catalyst with an inert gas (regeneration gas K1) at from 400 to 800° C. and subsequently treating the deactivated catalyst which has been pretreated with regeneration gas K1 with an oxygen-containing gas (regeneration gas K2).