Sirac Srl.

Inalco S.p.a.

Franco Innocenti

Renato Carobbi

Stable boron resins of high selective absorbent power and their production process. Said boron resins consist of a polyacrylic matrix functionalized with quaternary ammonium groups, an epoxy group and phenylboric groups in accordance with general formula (I): ##STR1## in which P, R, R.sub.1, R.sub.2, R.sub.3, R.sub.4 and X.sup.- are as defined in the text. The resins are prepared by reacting an amine resin with an epihalohydrin and condensing the reaction product with a suitable boroxin. The resins of formula (I) can be used for separating sugars, in particular for purifying lactulose. They have greater selective power than currently known boron resins.

Stable boron resins of high selective absorbent power

Stable boron resins of high selective absorbent power, their production process, and processes of using said boron resins. The boron resins include a polyacrylic matrix functionalized with quaternary ammonium groups, an epoxy group and phenylboric groups in accordance with general formula (I): ##STR1## in which P, R, R.sub.1, R.sub.2, R.sub.3, Y and X.sup.- are as defined in the text. The resin is prepared by condensing an acrylic resin with an epihalohydrin and then with a halide or hydroxide of an oxiphenyl-aminophenyl- or thiophenyl-boroxin or their alkyl derivatives. Compared with similar currently known resins, the resins of formula (I) have improved selectivity in sugar preparation. They can be used for purifying lactulose.

Boron resins of high selective absorbent power

A method for preparing high-purity crystalline lactulose and the product obtained by the method, which comprises crystallization from aqueous solutions at a temperature of 5.degree.-40.degree. C., the starting aqueous solution having a lactulose concentration of 50-80% w/w, a lactose concentration of less than 5% of the lactulose concentration by weight, a galactose concentration of less than 5% of the lactulose concentration by weight, and a concentration of other sugars of less than 4% of the lactulose concentration by weight.

Method for preparing high-purity crystalline lactulose

A process for preparing high-purity lactulose by the following stages:

Process for preparing high-purity lactulose syrup and the syrup obtained

A process for preparing lactulose from lactose in which an aqueous lactose mixture is reacted with a sodium aluminate solution and the solution obtained is continuously neutralized by feeding this solution and a sulphuric acid solution to a reactor simultaneously in such a manner as to obtain a pH of between 4.5 and 8. By operating in this manner an aluminium hydroxide suspension is obtained which can be easily separated from the lactulose solution.

Process for preparing lactulose from lactose by epimerization with

Stable boron resins of high selective absorbent power and their production process. Said boron resins consist of a polyacrylic matrix functionalized with quaternary groups, an epoxy group and phenylboric groups in accordance with general formula (I): ##STR1## in which P, R, R.sub.1, R.sub.2, R.sub.3, Y and X.sup.- are as defined in the text. The resin is prepared by condensing an acrylic resin with an epihalohydrin and then with a halide or hydroxide of an oxiphenyl-aminophenyl- or thiophenyl-boroxin or their alkyl derivatives. Compared with similar currently known resins, the resins of formula (I) have improved selectivity in sugar separation. They can be used for purifying lactulose.

Stable boron resins of high selective absorbent power and their production process. Said boron resins consist of a polyacrylic matrix functionalized with quaternary ammonium groups, an epoxy group and phenylboric groups in accordance with general formula (I): ##STR1## in which P , R.sub.1, R.sub.2, R.sub.3, R.sub.4 and X.sup.- are as defined in the text. The resins are prepared by reacting an amine resin with an epihalohydrin and condensing the reaction product with a suitable boroxin. The resins of formula (I) can be used for separating sugars, in particular for purifying lactulose. They have greater selective power than currently known boron resins.

Growing community of inventors

Bagno A Ripoli, Italy

Franco Innocenti