Sodium salt of a copolymer of acentrella and maleic anhydride as a substance exhibiting ion-exchange properties

 

(57) Abstract:

Usage: the synthesis of copolymers of nitroethylene and maleic anhydride and their sodium salts, which can be used in the chemical industry as substances exhibiting ion-exchange properties. The inventive copolymer structure specified in the description, with a molecular mass of 78000-100000, where n = 390-500. table 1.

The invention relates to the chemistry of the modified polymers, specifically to a new sodium salt of a copolymer of acentrella and maleic anhydride (SPAN-MA), and can be used in the chemical industry, including for the separation of mixtures of metal ions, as well as for deposition and codeposition of metals.

Known industrial carboxyl ion type KB [1] however, they have low exchange capacity and, in addition, act as ion exchangers mostly in a series of alkaline earth metals.

The closest achieved the effect are the nitro-derivatives of chlorinated atactic polypropylene (APH) and polyvinyl chloride (PVC) [2]

The ion-exchangers based on APH and PVC have a wider scope in contrast to ion-type KB and proaza not high enough.

The aim of the present invention to provide a new ion exchanger with high exchange capacity.

This objective is achieved in that the ion exchanger with improved characteristics selectivity is proposed to use a modified sodium nitrite is a copolymer of vinyl chloride and maleic anhydride (SPWH-MA) in the form of its sodium salt, having the structure

< / BR>
where n 390-500, MM 78000-100000

Full sodium salt SPAN-MA contain in the structure of the carboxyl groups

as an industrial ion type KB and nitro nitro-derivatives as APH and PVC. The set of features is the structure of the ion exchanger provides greater selectivity, however, the mutual influence of carboxy - and itinirary, as well as the influence of molecular weight is not obvious.

The proposed ion exchanger is produced by interaction SPWH-MA NaNO2in dimethylformamide (DMF), maintaining the mixture from 6 h up to 40 minutes at a temperature of 70-100oC followed by treatment with an aqueous solution of alkali within 12 hours the product Yield of 83% of the nitrogen content of nitro groups 4-7 wt.

Example 1. In a round bottom flask with reflux condenser are placed 10 g SPWH-MA (mol. m shivani 40 min at 90oC. the Solution is cooled and poured into 15 ml of 4 and NaOH solution and leave in the cold for 12 hours. The precipitation is separated, dried in vacuumsealed Cabinet. The product, sodium salt of a copolymer of acentrella and maleic anhydride brown, soluble in water, acetone and other solvents. Exit 83%

Changing the temperature and duration of nitration leads to a final product with different molecular weight. Thus, carrying out the reaction at 60oC for 6 h with subsequent transfer to the sodium salt allows to obtain a product with MM 78000. Synthesis at 100°C for 1 h gives the product MM 100000.

The structure of the final product was identified by IR spectroscopy, elemental analysis, potentiometric titration. The molecular weight of the methods of high-speed sedimentation and gel chromatography.

In the IR spectra of sodium salt SPAN-MA. there is a new band 1620 cm-1that answersVal.C=N aciniform. At the same time in the 1700-1800 cm-1noVal.C=O present in the IR spectra of the copolymer of nitroethylene and maleic anhydride, which means that the NaOH reacts not only with nitrogroup, but with anhydrite ring with the formation of groups-C00<'s who I am. Depending on the synthesis conditions, it is 4.5-7% compared to data from elemental analysis allowed to determine the ratio of:

< / BR>
where the content of nitrogen in NO2groups, Ntotal- the content of total nitrogen.

With increasing amount of nitrogen in the molecule increases total capacity calculated by potentiometric titration curve.

The average molecular mass was measured on an analytical ultracentrifuge model 3180 method of high-speed sedimentation, as well as by gel-chromatography. The convergence results are satisfactory.

Determination of exchange capacity of metals held complexometric titration by Trilon B (Zn++, Mg++), and (Cu++, Fe+++Nd++Er+++) on the photocolorimeter using the calibration curves. The table shows some values exchange capacity.

Sodium salt of a copolymer of acentrella and maleic anhydride patterns

< / BR>
with mol. m 78000 100000,

where n 390 500,

as a substance exhibiting ion-exchange properties.

 

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