NOVELTY - Preparation of silicon hydride compound (I) comprises reaction of at least one silicide or silicon alloy powder with an aqueous solution comprising carbon dioxide, where the solution is optionally saturated with carbon dioxide at reaction temperature and reaction pressure.    USE - The process is useful for the preparation of the silicon hydride compound (claimed) for manufacturing integrated semiconductors, thin or crystalline solar cell (photovoltaic) layers, semiconductor components and flat screens.    ADVANTAGE - The process can able to easily, rapidly and economically produce the silicon hydride compound with high yield.    DETAILED DESCRIPTION - Preparation of silicon hydride compound of formula (SinH2n+2) (I) comprises reaction of at least one silicide or silicon alloy powder of formula (M1xM2ySiz) with an aqueous solution comprising carbon dioxide, where the solution is optionally saturated with carbon dioxide at reaction temperature and reaction pressure.    n = 1-4;    M1 = metal reducer, preferably aluminum;    M2 = an alkali or alkaline earth metal, preferably calcium or magnesium; and    x, y, z = 0-1.    Provided that where z is different from 0 and the sum of x and y is different from 0. An INDEPENDENT CLAIM is included for a web site unit (1) for implementation of the preparation of the silane comprising at least one reactor (3) equipped with units (9, 10) for introduction of silicon alloy powder and units (5, 7) for introduction of acid solution, a purification circuit comprising at least one reflux column (2) stopping water vapor, a demister, fractionation column for separating the silane and a double distillation column for recovering the pure monosilane, and at least one reservoir for sedimentation and filtration of liquid product.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a web site unit for implementation of the preparation of the silane.    Web site unit (1)    Reflux column (2)    Reactor (3)    Units for introduction of acid solution (5, 7)    Units for introduction of silicon alloy. (9, 10)