SU362851A1 - METHOD OF OBTAINING CATIONITES - Google Patents

Description

one

A known method of producing cation exchangers by sulphonating polycondensation products of diphenyloxide with formaldehyde. The resulting ion exchange resins have high heat resistance.

It is proposed to obtain cation exchangers by sulfonating the products of diphenyloxide polycondensation with furfural. The use of furfural instead of formaldehyde makes it possible to increase the heat resistance and radiation resistance due to the presence in the polymer structure of an unsaturated furan ring.

Example 1. Synthesis of cation exchanger by sulfonation of a diphenyloxide polycondensation product with furfural in a block.

In a three-necked flask equipped with a mechanical stirrer, a thermometer and a reflux condenser are placed 17.2 g (1 mol) of diphenyloxide and 2.7 ml (0.5 mol) of HzSOi (, 83 g / sl {). Increase the reaction temperature to 50 ° C and, while vigorously stirring, 14.40 g (1.5 mol) of freshly distilled furfural are added dropwise. After 2.5 hours, a resin is formed in the form of granules, which are washed and cured at 110 ° C for 8-10 hours. Next, the dried granules are placed in a three-necked flask, where 21.6 ml (4 mol) of P28O4 (., 83 g / cm) per 1 mol of diphenyloxide are poured. After 1 hour, the granules are washed and dried at 100-110 ° C for 7 hours.

Properties of the resulting cation.

1. Humidity - 25%.

2. Pouring weight - 0.51 g / ml.

3. The specific volume is 1.2 ml / g.

4. Heat resistance. When the obtained katnonite is boiled in distilled water for 20 hours, the exchange capacity does not change.

5. The static exchange capacity of cation exchanger but 0.1 n. NaOH solution - 3.4 mEq / g.

6. Chemical resistance. Static exchange capacity after solution treatment:

5n.P95O4 - 2.6 mEq / g,

10% P202 - 2.6 mEq / g.

Example 2. Synthesis of cation exchanger by sulfonation of the product of the polycondensation of diphenyloxide with furfural in a solvent.

In a three-necked flask equipped with a mechanical stirrer, a thermometer and a reflux condenser, 17.22 g (1 mol) of difeiyl oxide was placed, which was dissolved in 20 ml of carbon tetrachloride (per 1 mol of diphenyloxide) and 2.7 ml (9.5 mol) ( , 83 g / cm). Raise the reaction temperature to 50 ° C and, while vigorously stirring, 14.40 g (1.5 mol) of freshly distilled furfural are added dropwise. After 2.5 hours, a resin is formed in the form of granules, which are washed and cured at llO ° C for 8-10 hours. Next, the dried granules are placed in a three-necked flask, where 21.6 ml (4 mol) of 3 H2SO4 (Y-1.83 g / cm) is poured. After 1 hour, the granules are washed and dried at 110 ° C for 7 hours. Properties of the obtained cation exchanger. 1. Humidity - 23.5%, 5 2. Poured weight - 0.67 g / gf. 3. The specific volume is 1.35 ml / g. 4. Heat resistance. When the obtained cation exchanger is boiled in distilled water for 20 hours, the exchange capacity does not change. Y 5. The static exchange capacity of the cation exchanger is 0.1 n. NaOH solution — 4.0 mEq / g. 4 6. Chemical resistance. Static exchange capacity after solution treatment: o) o7. f 10% H202 - 3.15 mEq / g. The subject of the invention. A method for producing cation exchangers by polycondensation of diphenyloxide with an aldehyde followed by sulphonation of the obtained product, characterized in that furfurol is used as an aldehyde to expand the range of cation exchangers.