The present invention is directed to a process for producing inorganic particulate material, the material obtainable by such process, a modified release delivery system comprising the material and the use of the material for the administration of a bioactive agent.

The invention relates to a process for producing a paste-like SiO.sub.2 composition using an SiO.sub.2 slip which allows simple intermediate storage and transport conditions without the processability of the slip to give the paste-like SiO.sub.2 composition being impaired thereby. According to the invention, it is for this purpose proposed that a homogeneous SiO.sub.2 base slip be subjected to a drying step to form a dry SiO.sub.2 composition and subsequently be processed further by means of a remoistening step to give the paste-like SiO.sub.2 composition, where the remoistening step comprises the addition of liquid to the dry SiO.sub.2 composition to form a paste-like kneadable SiO.sub.2 composition having a solids content of more than 85% by weight. The invention further relates to the use of a paste-like SiO.sub.2 composition as repair composition.

An inorganic porous carrier including a linker of formula (1), wherein a mode diameter in a pore distribution is 0.04 m to 1 m, and a predetermined cumulative pore volume ratio is 30% or less [a bond * represents a linkage to the oxygen atom of a silanol group in an inorganic porous substance; n is an integer; R represents independently of each other an alkyl group containing 3 to 10 carbon atoms which may optionally have a substituent such as an alkoxy group; and L represents a single bond; an alkylene group of 1 to 20 carbon atoms; or an alkylene group containing 2 to 20 carbon atoms which contains CH.sub.2-Q-CH.sub.2 group wherein any group Q selected from a group consisting of O etc. is inserted into at least one of CH.sub.2CH.sub.2 group constituting the alkylene group]; and a method for preparing a nucleic acid using the same. ##STR00001##

The present invention relates to a supported catalyst comprising a support and 0. 1 to 10 wt. % of tantalum, calculated as Ta.sub.2O.sub.5 and based on the total weight of the catalyst. wherein the supported catalyst further comprises from 50 to 350 ppm of aluminium and from 300 to 500 ppm of sodium, based on the total weight of the catalyst, respectively. Moreover, the invention relates to a catalyst reaction tube for the production of 1,3-butadiene comprising at least one packing of the supported catalyst as defined herein, to a reactor for the production of 1,3-butadiene comprising one or more of the catalyst reaction tubes as defined herein, and to a plant for the production of 1,3-butadiene comprising one or more of the reactors as defined herein. The invention also relates to a process for the production of 1,3-butadiene as defined herein and to a process for the production of the supported catalyst as defined herein. Finally, the present invention relates to the use of the supported catalyst as defined herein for the production of 1,3-butadiene from a feed comprising ethanol and acetaldehyde and to the use of aluminium in an amount in a range of from 50 to 350 ppm in a supported catalyst for the production of 1,3-butadiene from a feed comprising ethanol and acetaldehyde for increasing the yield of 1,3-butadiene.

The present invention relates to a supported catalyst comprising a support and 0. 1 to 10 wt. % of tantalum, calculated as Ta.sub.2O.sub.5 and based on the total weight of the catalyst. wherein the supported catalyst further comprises from 50 to 350 ppm of aluminium and from 300 to 500 ppm of sodium, based on the total weight of the catalyst, respectively. Moreover, the invention relates to a catalyst reaction tube for the production of 1,3-butadiene comprising at least one packing of the supported catalyst as defined herein, to a reactor for the production of 1,3-butadiene comprising one or more of the catalyst reaction tubes as defined herein, and to a plant for the production of 1,3-butadiene comprising one or more of the reactors as defined herein. The invention also relates to a process for the production of 1,3-butadiene as defined herein and to a process for the production of the supported catalyst as defined herein. Finally, the present invention relates to the use of the supported catalyst as defined herein for the production of 1,3-butadiene from a feed comprising ethanol and acetaldehyde and to the use of aluminium in an amount in a range of from 50 to 350 ppm in a supported catalyst for the production of 1,3-butadiene from a feed comprising ethanol and acetaldehyde for increasing the yield of 1,3-butadiene.