Method of hydrolyzing chlorosilanes

Claim 2

In a chlorosilanes hydrolysis method comprising hydrolyzing chlorosilane in a stoichiometric excess of water to produce a polysiloxane hydrolyzate and an aqueous hydrogen chloride solution, whereby hydrogen chloride is recycled by heating the resulting aqueous hydrogen chloride solution obtained from the hydrolysis to form a constant boiling HCl-water azeotrope and anhydrous hydrogen chloride requiring a major amount of input energy, the improvement which comprises hydrolyzing the chlorosilane in substantially a stoichiometric equivalence of water to produce substantially the same polysiloxane hydrolyzate as obtained with excess water, anhydrous hydrogen chloride and a saturated aqueous solution of hydrogen chloride, whereby the requirement of a major amount of input energy is avoided.

Claim 3

A method in accordance with claim 1, where saturated aqueous hydrogen chloride is recycled to the hydrolysis reactor.

Claim 4

A method in accordance with claim 1, where anhydrous hydrogen chloride is recovered from the hydrolysis mixture.

Claim 5

In a chlorosilanes hydrolysis method comprising hydrolyzing dimethyldichlorosilane in a stoichiometric excess of water to produce a polysiloxane hydrolyzate and an aqueous hydrogen chloride solution whereby hydrogen chloride is recycled by heating the resulting aqueous hydrogen chloride solution obtained from the hydrolysis to form a constant boiling HCl-water azeotrope and anhydrous hydrogen chloride requiring a major amount of input energy, the improvement which comprises hydrolyzing the dimethyldichlorosilane in substantially a stoichiometric equivalence of water to produce substantially the same polysiloxane hydrolyzate as obtained with excess water, anhydrous hydrogen chloride and a saturated aqueous solution of hydrogen chloride, whereby the requirement of a major amount of input energy is avoided.

Claim 6

In a chlorosilanes hydrolysis method comprising hydrolyzing dimethyldichlorosilane in a stoichiometric excess of water to produce a polysiloxane hydrolyzate and an aqueous hydrogen chloride solution whereby hydrogen chloride is recycled by heating the resulting aqueous hydrogen chloride solution obtained from the hydrolysis to form a constant boiling HCl-water azeotrope and anhydrous hydrogen chloride requiring a major amount of input energy, the improvement which comprises hydrolyzing the dimethyldichlorosilane in substantially a stoichiometric equivalence of water to produce substantially the same polysiloxane hydrolyzate as obtained with excess water, anhydrous hydrogen chloride and a saturated aqueous solution of hydrogen chloride, whereby the requirement of a major amount of input energy is avoided.

Claim 7

In a chlorosilanes hydrolysis method comprising hydrolyzing trimethylchlorosilane in a stoichiometric excess of water to produce a polysiloxane hydrolyzate and an aqueous hydrogen chloride solution whereby hydrogen chloride is recycled by heating the resulting aqueous hydrogen chloride solution obtained from the hydrolysis to form a constant boiling HCl-water azeotrope and anhydrous hydrogen chloride requiring a major amount of input energy, the improvement which comprises hydrolyzing the trimethylchlorosilane in substantially a stoichiometric hydrolyzate as obtained with excess water, anhydrous hydrogen chloride and a saturated aqueous solution of hydrogen chloride, whereby the requirement of a major amount of input energy is avoided.

Claim 8

In a chlorosilanes hydrolysis method comprising hydrolyzing trimethylchlorosilane in a stoichiometric excess of water to produce a polysiloxane hydrolyzate and an aqueous hydrogen chloride solution whereby hydrogen chloride is recycled by heating the resulting aqueous hydrogen chloride solution obtained from the hydrolysis to form a constant boiling HCl-water azeotrope and anhydrous hydrogen chloride requiring a major amount of input energy, the improvement which comprises hydrolyzing the trimethylchlorosilane in substantially a stoichiometric hydrolyzate as obtained with excess water, anhydrous hydrogen chloride and a saturated aqueous solution of hydrogen chloride, whereby the requirement of a major amount of input energy is avoided.

Claim 9

In a chlorosilanes hydrolysis method comprising hydrolyzing methyltrichlorosilane in a stoichiometric excess of water to produce a polysiloxane hydrolyzate and an aqueous hydrogen chloride solution wherby hydrogen chloride is recycled by heating the resulting aqueous hydrogen chloride solution obtained from the hydrolysis to form a constant boiling HCl-water azeotrope and anhydrous hydrogen chloride requiring a major amount of input energy, the improvement which comprises hydrolyzing the methyltrichlorosilane in substantially a stoichiometric equivalence of water to produce substantially the same polysiloxane hydrolyzate as obtained with excess water, anhydrous hydrogen chloride and a saturated aqueous solution of hydrogen chloride whereby the requirement of a major amount of input energy is avoided.

Claim 10

In a chlorosilanes hydrolysis method comprising hydrolyzing methyltrichlorosilane in a stoichiometric excess of water to produce a polysiloxane hydrolyzate and an aqueous hydrogen chloride solution wherby hydrogen chloride is recycled by heating the resulting aqueous hydrogen chloride solution obtained from the hydrolysis to form a constant boiling HCl-water azeotrope and anhydrous hydrogen chloride requiring a major amount of input energy, the improvement which comprises hydrolyzing the methyltrichlorosilane in substantially a stoichiometric equivalence of water to produce substantially the same polysiloxane hydrolyzate as obtained with excess water, anhydrous hydrogen chloride and a saturated aqueous solution of hydrogen chloride whereby the requirement of a major amount of input energy is avoided.