Abstract A continuous process for preparing silanes and siloxanes having SiOC groups which comprises (a) introducing in a liquid phase a chlorosilane and a hydroxyl-containing aliphatic compound in parallel flow into a first stage of a first reactor in an amount such that from 0.5 to 0.9 gram-mole of hydroxyl group is present per gram-atom of Si-bonded chlorine; (b) removing the liquid reaction mixture from the first reactor; (c) introducing the reaction mixture at the head of a column used as the second reactor which is maintained at an elevated temperature; (d) adding a hydroxyl-containing aliphatic compound as a gas at the lower end of the column or at a point between the lower end and the upper end of the lower one-third of the column, in an amount at least sufficient to completely react with the Si-bonded chlorine present in the reaction mixture obtained from the first stage and (e) removing the silane containing SiOC groups or polysiloxane containing SiOC groups from the column at a point below the point of addition of the hydroxyl-containing aliphatic compound.
A continuous process for preparing silanes and polysiloxanes containing SiOC groups which comprises (a) introducing in parallel flow a silicon compound having Si-bonded chlorine and a hydroxyl-containing aliphatic compound in a liquid phase, into a first stage of a first reactor in an amount of from 0.5 to 0.9 gram-mole of hydroxyl group per gram-atom of Si-bonded chlorine; (b) removing the liquid reaction mixture from the first reactor; (c) introducing the reaction mixture into a second stage at the head of a column forming a second reactor which is maintained at an elevated temperature; (d) adding a hydroxyl-containing aliphatic compound as a gas to the column at a point between the lower end and the upper end of the lower one-third of the column in an amount sufficient to at least completely react with the remaining Si-bonded chlorine in the reaction mixture obtained from the first stage and (e) removing the reaction product from the column at a point below the point of addition of the hydroxyl-containing aliphatic compound.
Claim 2
Dependent Claim
169 words
A continuous process for preparing silanes and polysiloxanes containing SiOC groups which comprises (a) introducing in parallel flow a silicon compound having Si-bonded chlorine and a hydroxyl-containing aliphatic compound in a liquid phase, into a first stage of a first reactor in an amount of from 0.5 to 0.9 gram-mole of hydroxyl group per gram-atom of Si-bonded chlorine; (b) removing the liquid reaction mixture from the first reactor; (c) introducing the reaction mixture into a second stage at the head of a column forming a second reactor which is maintained at an elevated temperature; (d) adding a hydroxyl-containing aliphatic compound as a gas to the column at a point between the lower end and the upper end of the lower one-third of the column in an amount sufficient to at least completely react with the remaining Si-bonded chlorine in the reaction mixture obtained from the first stage and (e) removing the reaction product from the column at a point below the point of addition of the hydroxyl-containing aliphatic compound.
Claim 3
Dependent Claim
20 words
The continuous process of claim 1, wherein water is added at any point along the column forming the second reactor.
Claim 4
Dependent Claim
19 words
The continuous process of claim 1, wherein the temperature of the first reactor is from 0° to 20° C.
Claim 5
Dependent Claim
20 words
The continuous process of claim 1, wherein the residence time in the first reactor is from 5 to 15 minutes.
Claim 6
Dependent Claim
59 words
The continuous process of claim 1, wherein the temperature of the column used as the second reactor is at least half a degree above the boiling point of the hydroxyl-containing aliphatic compound at a point about 10 cm below the point of addition of the reaction mixture obtained from the first reactor at the prevailing pressure in the column.