HIGHLY CONCENTRATED FLOWABLE SALT ALKYLPOLYALKOXYSULPHATES SALTS Russian patent published in 2017 - IPC C09K8/584 E21B43/22 

FIELD: chemistry.

SUBSTANCE: highly concentrated composition of APAS for use as metal processing working fluids, chemicals for application in oil fields, chemicals for application in gas and/or tertiary oil production fields, flowable at min. 25°C, comprising: more than 75 wt % of APAS salts, where APAS contain an average of 3 to 20 alkoxy groups, at least 2/3 alkoxy groups are propoxy groups, and alkyl radicals are radicals of fatty alcohols containing 12 to 18 carbon atoms, and from 1 to less than 25 wt % of water, wherein the composition has a viscosity less than 10,000 mPas⋅, measured according to DIN 53019 standard at a temperature of 25°C and a shear rate of D=10 c^-1. The method for productio of the said composition comprises at least the following steps: alkoxylated fatty alcohol is reacted with SO₃ in a falling film reactor, the said alcohol comprises an average of 3 to 20 alkoxy groups, at least 2/3 alkoxy groups are propoxy groups, and alkyl radicals are radicals of fatty alcohols containing 12 to 18 carbon atoms, and gas-liquid separation is performed, at that, the liquid phase is neutralized by an aqueous solution of alkali metal hydroxide, containing more than 25 wt % of alkali metal hydroxide. Application of the above composition after dilution and addition of other substances to support crude oil extraction, as well as application of the said composition in enhanced oil extraction or tertiary oil extraction, optionally after dilution with additional components, is proposed. The invention is developed in subclaims.

EFFECT: increased emulsifying effect.

21 cl, 1 tbl, 1 ex