NOVELTY - Preparing silicon compound (I), comprises reaction of silicide or silicon alloy (II) in the form of powder with hydrochloric acid previously dissolved in an aprotic solvent of ether type.    USE - The process is useful for the preparation of silane or silicon hydride from silicon alloys or silicides, where the silane, preferably monosilane or silicon tetrahydride is useful as a vector of silicon in deposition techniques of amorphous silicon, polycrystalline silicon, nanocrystalline silicon, or microcrystalline silicon, silica, silicon nitride, or other silicon compound, e.g. in deposition techniques of vapor phase, where the monosilane is useful for the manufacture of integrated semiconductors and manufacturing thin layers or crystalline solar cells (photovoltaic cell), semiconductor components and to manufacture flat screens.    ADVANTAGE - The process: is easy, inexpensive and ecofriendly; and provides silicon compound with less corrosive, non-toxic and inflammable, with high storage stability, high purity, and high yield.    DETAILED DESCRIPTION - Preparing silicon compound of formula (SinH2n+2) (I), comprises reaction of at least one silicide or silicon alloy of formula (M1xM2ySiz) (II) in the form of powder with hydrochloric acid previously dissolved in an aprotic solvent of ether type.    n = greater than or equal to 1 to less than or equal to 3;    M1 = metal reducer, preferably aluminum;    M2 = an alkali metal or alkaline earth metal, preferably calcium or magnesium; and    x, y, z = 0-1 (where z is different from 0 and the sum x+y is different from 0.)    An INDEPENDENT CLAIM is included for a unit on site (1), for implementation of manufacturing silanes, comprising: at least one reactor (2) equipped with means (5, 7) for introduction of the silicon alloy powder and means (6, 16) for introducing a solution of crown ether such as tetrahydrofuran containing hydrochloric acid; a purification system (3) including a fractioning column to separate silanes and double distillation to recover the pure monosilane and/or a mixture of silane and disilane; and at least one means for recycling (4) for recycling in the reactor (2), tetrahydrofuran unused in the reaction between the silicon alloy and hydrochloric acid previously dissolved in crown ether as tetrahydrofuran.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the unit on site for implementation of the preparation of the silanes.    Unit on site (1)    Reactor (2)    Means for recycling (4)    Means for introduction of the silicon alloy powder (5, 7)    Means for introducing a solution of crown ether. (6, 16)