Abstract: A process for a continuous production of a polyetherol first involves reacting a catalyst (5) with an alcohol starter (3) or an alkoxylated precursor, to give a mixture comprising an alcoholate and water. Water is then removed from the mixture. The process further involves feeding the alcoholate into a bubble column and feeding an alkylene oxide into the bottom of a compartment of the bubble column, such that the alkylene oxide rises in the alcoholate. The alkylene oxide then reacts with the alcoholate or a secondary product from the reaction between the alcoholate and alkylene oxide, to give the polyetherol.

Abstract: A process for a continuous production of a polyetherol first involves reacting an alcohol with a starter or an alkoxylated precursor, to give a mixture comprising an alcoholate and water. Water is then removed from the mixture. The process further involves feeding the alcoholate into a bubble column and feeding an alkylene oxide into the bottom of a compartment of the bubble column, such that the alkylene oxide rises in the alcoholate. The alkylene oxide then reacts with the alcoholate or a secondary product from the reaction between the alcoholate and alkylene oxide, to give the polyetherol.

Abstract: Novel ruthenium catalysts can be obtained by: i) treating a support material based on amorphous silicon dioxide one or more times with a halogen-free aqueous solution of a low molecular weight ruthenium compound and subsequently drying the treated support material at below 200° C., ii) reducing the solid obtained in i) by means of hydrogen at from 100 to 350° C., where step ii) is carried out directly after step i). These catalysts can be used for the catalytic hydrogenation of monosaccharides and disaccharides to produce sugar alcohols, with the exception of sorbitol.

Abstract: Sugar alcohols are prepared by catalytically hydrogenating the corresponding monosaccharides and oligosaccharides in the liquid phase over a heterogeneous ruthenium catalyst, with the exception of the preparation of sorbitol, wherein the heterogeneous ruthenium catalyst is prepared by: i) treating a support material based on amorphous silicon dioxide comprising at least 95% by weight of silicon dioxide and less than 1% by weight aluminum oxide, calculated as Al2O3, one or more times with a halogen-free aqueous solution of a low molecular weight ruthenium compound which is a ruthenium (III) salt or a metal ruthenate and subsequently drying the treated support material at a temperature below 200° C., and ii) reducing the solid obtained in i) by means of hydrogen at a temperature ranging from 100 to 350° C., wherein step ii) is carried out directly after step i), and wherein the ruthenium content in the catalyst ranges from 0.1 to 5% by weight, based on the support material.

Abstract: A process is described for preparing sorbitol by catalytic hydrogenation of a monosaccharide forming sorbitol on hydrogenation in the liquid phase, which comprises the catalyst being obtainable by: i) single or multiple treatment of an amorphous silicon dioxide based support material with a halogen-free aqueous solution of a low-molecular-weight ruthenium compound and subsequent drying of the treated support material at below 200° C., ii) reducing the solid obtained in i) with hydrogen at from 100 to 350° C., step ii) being carried out immediately after step i).

Abstract: Novel ruthenium catalysts can be obtained by:

Abstract: A process is described for preparing sorbitol by catalytic hydrogenation of a monosaccharide forming sorbitol on hydrogenation in the liquid phase, which comprises the catalyst being obtainable by:

Abstract: Alkenes are prepared by partial hydrogenation of alkynes in the liquid phase at from 20 to 250° C. and hydrogen partial pressures of from 0.

Abstract: Double-metal cyanide catalysts of the formula M1a[M2(CN)b(A)c]d. fM1gXn. h (H2O).

Abstract: Alkenes are prepared by partial hydrogenation of alkynes in the liquid phase at from 20 to 250° C. and hydrogen partial pressures of from 0.