Method for preparation of bis(fluorosulfonyl)-imide

A method for the preparation of a compound of formula (I);

• the method comprises a step STEP1;
• STEP1 comprises a reaction REAC1-1;
• in REAC1-1 a mixture MIXTURE-TRIPLE is reacted with HF at a temperature TEMP1-1, TEMP1-1 is at least 80° C.;
• MIXTURE-TRIPLE comprises three components, a compound of formula (II), a compound of formula (III) and a compound of formula (IV);
• X is identical with X1 or with X2;
• X1 and X2 are identical or different and independently from each other selected from the group consisting of F, Cl, Br, I, RESF, and tolyl;
• wherein RESF is a fluorinated C1-9 alkyl, which is unsubstituted or substituted by a substituent OCF3;
• Rn+ is selected from the group consisting of H+, Li+, Na+, K+, Mg2+, Ca2+, Zn2+, Cu2+, Al3+, Ti3+, Fe2+, Fe3+, B3+,
• [N(R20)(R21)(R22)R23]+, and [P(R20)(R21)(R22)R23]+;
• R20, R21, R22 and R23 are identical or different and independently from each other selected from the group consisting of H, C1-8 alkyl, C5-6 cycloalkyl, phenyl, benzyl, vinyl and allyl;
• n is 1, 2 or 3;
• wherein
• the total content of the three components in MIXTURE-TRIPLE is of from 50 to 100%, the % being % by weight based on the total weight of MIXTURE-TRIPLE;
• wherein
• the relative ratio of the three components in MIXTURE-TRIPLE is of from
• 2 to 98% of the compound of formula (II),
• 49 to 1% of the compound of formula (III), and
• 49 to 1% of the compound of formula (IV);
• the % are % by weight and are based on the combined weight of the three components in MIXTURE-TRIPLE;
• the relative ratios of the three components add up to 100%.