Method for producing organopolysiloxane resins

A process for preparing organopolysiloxane resins, comprising:

• in a first continuous step, reacting organochlorosilanes in an upright circulation tube reactor which, via a heating assembly on an ascending part of the tube reactor regulates the temperature in the circulation tube reactor, with 0.10 to 0.75 mol of water per mole of hydrolyzable chlorine and with 0.3 to 1.0 mol of alcohol per mole of hydrolyzable chlorine, where the molar ratio of water to alcohol is 0.10 to 2.5, the ratio of aqueous alcohol to silane mixture is regulated within the previous limits such that the fraction of the alcohol phase in the product mixture of this first step is 0.1-50 wt %, where the temperature of the reaction medium is provided to the heating assembly as a regulated variable, compared with a fixed temperature in the range of 20-60° C. as a control variable, and is regulated with an accuracy of ±5° C. with respect to the control variable, and the amount of alcohol used in this first step is reduced to an extent such that the fraction of alcohol phase in the overall product mixture of the first step is 0.1-50 wt %, the hydrous alcohol used optionally comprising up to 31 wt % of dissolved HCl and up to 5 wt % of water-insoluble organic solvents;
• in a second step, adding to the reaction mixture obtained in the first step, water-insoluble organic solvent having a density of below 0.95 kg/l and metering in water in amounts of 1.5 to 5 mol of water per mole of Si component and also adding 0.1 to 0.5 mol of alcohol per mole of silicon component, and, after the end of the metered additions in the second step, the alcoholic HCl phase is separated;
• in a third step, metering in water in amounts of 5 to 200 mol of water per mole of Si component to the siloxane phase of the second step, and optionally adding water-insoluble organic solvent having a density of below 0.95 kg/l;
• and
• in a fourth step, after the end of the metering of water in the third step, separating an aqueous phase from the siloxane phase.