SU451716A1 - The method of obtaining cation-exchange fiber - Google Patents

Description

one

The invention relates to the field of producing synthetic fibers with ion exchange properties, which are used as sorbents, complexing agents, and for other purposes.

A known method for producing a cation exchange fiber by reacting a polypeptide fiber (from depndratirate) yoy polyvinyl alcohol) with noHoreiiJii iM is supplied to the penis - malehydride.

The disadvantage of this method is the mo function of the synthesized ion exchange fiber (pK 8-9), which determines the low selectivity of the fiber in sorption processes.

According to the proposed method, the dichloroisocyanuric acid sodium salt in the form of an aqueous solution with an active chlorine concentration of 10–40 g / l at a reaction temperature of 60–80 ° C and a duration of 0.5–1 hour is used as the ionogenic compound to create a bifunctional selective fiber.

Fibers obtained by dehydrating polyvinyl alcohol fibers or by dehydrochlorinating polyvyl chloride fibers can be used as polypeptide fibers.

Synthesized fiber is a bifunctional dual-type scramble.

iopogenic groups (pKi 7.6, pK2 9.7). And the presence of iopogenic groups with different degrees of dissociation determines the increased selectivity of the irpn sorbent adrenum fiber. ina -

0.45 g / g fiber.

The obtained katnon-exchange fiber has a high ion-exchange capacity, chemo- and thermal resistance, and can be used in well-known areas of the ipoobolim volokol.

Example. The freshly formed ylivelyl alcohol is kept in fiber for 8 minutes at room temperature in a 25% water solution of latrice bisulfate, drained and dried. Next, the fiber is dehydrated in the medium of boiling heptal at 100-120 ° С (the degree of dehydration is 40 mol.%). After that, the fiber is washed with water, wrung out and treated with an aqueous solution of dichloroisocyanuric acid bridging salt with a concentration of active chlorine 20 g / l rr pH 5.6 (natural medium) and temperature for 1 hour (module 50). The static exchange capacity of the obtained fiber is

.3.2 mEq / g. The result is a clean cat-exchanger characterized with ..., the presence of two stages of dissociation of ionic groups: pKi 7.6, pK2 9.7. The fiber sustains 5 regeneration cycles, in 5 n. the workings of e-natk and

Sulfuric acid at 100 ° C for 1 hour; the change in the e of the fiber bones is 1-3%. Adrenaline sorption 0.45 g / g fiber. . Iredmet of the Invention A method for obtaining cation-exchange fiber-5 on by reacting a polyene fiber with an ionic compound that is different4 in order to create a functional selective fiber, sodium ion is used as the ionic compound. g / l, and the reaction is carried out iipji 60-80 ° C for 0.5-1 hour.