초록 ▼

The present invention is directed to a method for extruding silica-rich solids. The method comprises mixing silica-rich solids with water in an alkali metal base or basic salt followed by mulling and extruding and subsequently drying the extrudate whereby the dried extrudate has a crush strength sup

The present invention is directed to a method for extruding silica-rich solids. The method comprises mixing silica-rich solids with water in an alkali metal base or basic salt followed by mulling and extruding and subsequently drying the extrudate whereby the dried extrudate has a crush strength superior to that of the prior art. The silica-rich solids can be silica alone, zeolite alone or a mixture thereof. The alkali metal can be sodium hydroxide. The invention is also directed to a product which has a special attribute in that they have sufficient integrity to withstand treatments with acids so that it is now possible to steam, acid extract, or calcine such extrudates. The catalyst can be used in hydrocarbon conversions such as hydrocracking, isomerization, hydrogenation, dehydrogenation, polymerization, reforming, catalytic cracking, or catalytic hydrocracking. The invention also relates to a method for extruding silica-rich solids which comprises substituting an alkali metal for hydrogen in silanol groups on outside surfaces of the silica-rich solids, mulling and extruding the substituted silica-rich solids and drying the extrudate whereby the dried extrudate has a crush strength superior to that of the prior art. The invention is also directed to a method for increasing the silica to metal ratio of a zeolite. The method comprises mixing silica-rich solids with water and an alkali metal base or basic salt, mulling and extruding the silica-rich mixture, drying the extrudate, ion exchanging the extrudate and recovering the catalyst which can be substantially metal free.

대표청구항 ▼

A method for extruding silica-rich solids which comprises mixing the silica-rich solids with water and an alkali metal base or basic salt followed by mulling and extruding wherein the amount of water added being sufficient to have a total solids content of from 25 to 75 weight percent, the alkali me

A method for extruding silica-rich solids which comprises mixing the silica-rich solids with water and an alkali metal base or basic salt followed by mulling and extruding wherein the amount of water added being sufficient to have a total solids content of from 25 to 75 weight percent, the alkali metal compound being added in an amount of from 0.25 to 10 weight percent on a dry basis based on the total solids calculated as sodium hydroxide equivalent, and drying and calcining the extrudate, whereby the dried and calcined extrudate has a crush strength superior to that of the prior art. The method according to claim 1 wherein the silica-rich solid is silica. The method according to claim 1 wherein the silica-rich solid is a zeolite material. The method according to claim 1, wherein the alkali metal base is a carbonate, borate, phosphate or silicate. The method according to claim 1, wherein the base is a quaternary ammonium hydroxide.