SU910665A1 - Process for producing anionites - Google Patents

Description

The invention relates to the field of production of vinylpyridine psi anion exchangers designed to extract anions and organic products of an acidic nature from acidic media, and can be used in the chemical, pharmaceutical and other industries. A known method for the preparation of low-base anion exchangers by copolymerization of vnnilshfidinov with divinyl compounds 13. With these anion exchangers capable of selectively removing anions from acidic media, they are easily regenerated, capable of causing an excitation of metal cations and organic products of an acidic nature due to the formation of coordination bonds. Exchange capacity anosggi on OD n. HSS solution of 5.2-6.0 mg eq / g, sor and amphibious capacity of silver cation 3-3.2 mg eq / g. However, the significant neutrality of known anion exchangers is their low kinetic properties of IB exchange and sorption processes. Thus, the degree obmshla 2 on the ion exchanger for 5 minutes of contact with OD n. NSV solution does not exceed 4O%, for 1O min contact 7O%. V, Best of all, a way to get high-level anosggs by means of a copo-immersion vi shtiridine with divisible margins and two ischees mn 2. At the same time, in order to provide an assay for one MOI from the polymer, they take no less than 1 hr hwhhhhhhhhhhhhhhhhhhhh and not their co-svcihmuyuyu hryhmchkhahhhhhhhmhkhah hryhmchkhahhhhhhhhhhhhhhhhhhhh who haven’t been replaced by one of the h1nmgrmxcdvm for 1MOEs. Full and weak annons (for example, in the process of purification of the solution of rhodanide from chlorides) are not suitable for the extraction of coeaifateanu due to the formation of a coordinate associated with the nitrogen atom of the pyridine ring of the OTcyi judectron pair, etc. The circuit of the invention is the improvement of the kinematic properties of anion exchangers. For this purpose, a method is proposed for preparing anion exchangers by treating copolymers of vinylnidines with shnell monomers with a halo-containing compound, using dL-chlorine hydrinaglycerol in an amount of 0.050.2 mol per 1 mol of copolymer. The advantage of the proposed sporba. This is an increase in the kinetic properties of the anion exchanger by a factor of 1.5–2 due to the increase in the hydroactivity of the polymer matrix while retaining the sorption properties characteristic of low-base anion exchangers. A proposal for a 1bl and method is as follows. Copolymers of vinyl pyridine derivatives with divinyl compounds are alkylated with d-chlorohydrin-glycerol in an amount of 0.05-0, 2 mol per 1 mol of the copolymer in a polar solvent at 8 ° -1OO ° C for 4-6 hours. Using a smaller amount of d-chlorohydrin glycerol practically affects the kinetic properties of anion exchange resin; The use of d-chloroiriniglycerin in a ratio of more than 0.2 mol per 1 mol of the copolymer leads to a significant increase in the number of highly basic groups. The use of alkyl halides that do not contain hydroxyl groups as alkylating agents in the proposed ratios leads to an increase in the kinetic properties of no more than 15–20%, which is not practical. Copolymers of 2,4-vinshiryridine, 2,5-6,2-and 2,4-methylvinylpyridine with dvishishbenzol, 2,5-divinylpyridine, dinzropropenylbenzene, dacrylamide, diBINilShidiridinepiperamium gel are used as istx copolymers of vinylpyridines. macrops istoy. and macro-structured structures. Example. 20 g (1 mol) of 2-methyl-5-vin1 rpgaridine copolymer with 15% divinylbenzene macroporous structure {w (6O vol.% Gasoline) is subjected to swelling, in a mixture of 40 ml of dimethylformamide and 3.70 g (0.2 mol) d - chlorohydrinagli of cerin for 30 minutes, then the reaction mixture is heated for 6 hours. The alkylated product is washed with water and chlorine ions with 3-4% sodium hydroxide solution, then with water. Washed anion exchange resin is analyzed. The content of hydroxyl groups is 2.0%. SOY 0.1 and. to a solution of hydrochloric acid, 5.6 mg eq / g, the exchange capacity for 5 min of contact is 5.4 mg eq / g (95%). Silver sorption capacity from 0.1 n. silver nitrate solution 3.2 mg eq / g. for 2 hours of contact 2.55 mg eq / g (80%). PRI mme R 2. 20 g of the dried 2-vinylpyridine copolymer with 8% divinylpyridine gel structure is subjected to swelling in a solution of 3.1 g of d-chlorohydrin glycerol at a rate of 0.15 mol per 1 mol of the copolymer in 5O ml of dimethylformamide for 5O min The leakage was carried out by heating the reaction mixture at 90 ° C for 4 hours. The alkylated product is washed from the solvent and treated with 5% sodium hydroxide solution until chlorine ions are removed. The treated anion exchange resin is analyzed. The content of hydroxyl groups is 2.8%, the potential capacity is 1.6 mg / g, EOU of O, 1 n. a solution of hydrochloric acid 5.2 mg eq / g, exchange capacity for 5 min of contact 4.2 mg eq / g (degree of exchange 80%), per 1O min of contact 4.8 mg eq / g (degree of exchange 92%). Sorption capacity of silver from 0.1 N .. solution (j3, l mg eq / g, for 2 hours of contact 1.6 mg eq / g (5O%). 11 p and m e r 3. 2O g dried copolymer 2- Methyl-5-vinylpyridine with 8 mol.% divinylpirkindiethylenepiperazine of a macroslate structure is subjected to swelling in a solution of 1.6 g of d-chlorohydringlycerol (at the rate of 0.05 mol per 1 mol) in 4O ml of dimethylformamide for 3 min. then the reaction mixture is heated within 6 hours. The alkylated product is washed from dissolving; IH and treated with 4% sodium hydroxide solution until chlorine ions are removed. Treated anions t analyzed. Hydroxyphene groups 2.2%, EOU 0.1 N hydrochloric acid solution 6.4 mg eq / g, exchange capacity for 5 min. contact 5.9 mg eq / g (exchange rate 92%), per 1O min of contact 6.25 mg eq / g (exchange degree 98%). Silver sorption capacity from O, 1 n AijNOFj solution 4.1 mg eq / g, for 2 hours of contact 3.12 mg eq / g (76% 4. Example 4. In this example, the preparation of anion exchanger by a known method 2 is described for comparison.

2O g of a copolymer of 2-methyl-5-vinylglyridine with 15% Aivinylbenzene, a macroporous structure is subjected to swelling in a mixture of 18.5 g of d-chlorohydringlyperin (based on 1 mol of 1 mol of copolymer) and 4O ml. dimethylformamide for 30 minutes Then the reaction mixture is heated at 90 ° C for 5 hours. The alkylated product is washed from the solvent, treated with 4% sodium hydroxide solution until chlorine ions are absent, washed with water to neutral and analyzed. Content hydroxyl Sorption kinematic properties of annonites

14%. The moisture content of 2.1 mg. SOY 0.1 n. mg solution eq / g, hydrochloric acid solution, exchange capacity for 5 min of contact 2.2 mg eq / g (75.0%), for 10 min 2.5 mg eq / g (86%). Soy on Oh, 1 n. a solution of sodium chloride 1, O8mg ersv / g

Sorbioin capacity in the middle is missing.

Comparative properties of anion exchangers, according to the proposed method, and known anion exchangers are given in the table.

5 minutes

2 h

1 h

Claims (1)

SUMMARY OF THE INVENTION A method for producing anion exchangers by treating copolymers of vinyl pyridines with divinyl monomers with a halogen-containing compound, characterized in that, in order to improve the kinetic properties of the anionites, cl-chlorohydrin aglycerol in an amount of 0.05-0.2 mol per 1 is used mole of a copolymer.