SU404353A1 - Method of preparing soluble ionites - Google Patents

Description

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I The invention relates to the field of production of soluble IONITES.

Ionites of this type are used in engineering as extractive agents, effective stabilizers of clay solutions for drilling oil and gas wells, for flotation beneficiation of ores, and can also be used for sorption and separation of stabilites and radioactive isotopes.

A method of obtaining soluble ion exchangers based on alkali cellulose by treatment with monochloroacetic acid is known.

This method is characterized by an elevated reaction temperature, and, when the product is released with a high degree of substitution, by repeated treatment with monochloroacetic acid, which leads to destruction of the polymer and a decrease in the yield of the target product. The ionites obtained by this method have an exchange capacity of 2.8-5.1 mg eq / g.

It is proposed to oxidize the oxidation of nitrogen by hydroxyethylcellulose.

The advantage of the proposed method of obtaining soluble ion exchangers is the one-stage process, the increased exchange capacity (4.3 2

8.9 mg eq / g) increase the yield of the target product. In its implementation, there is no need for an increased temperature and no use of monochloroacetic acid, L1, as an oxidizing agent, to use waste products from nitric acid production — nitrogen oxides.

Example. 10 g of hydroxyethyl cellulose, containing 32.4% of the hydroxyethyl groups, are oxidized with gaseous nitrogen oxides at a xalate temperature for 120 hours. The target product is washed with acetone and dried in air. Yield 9.0 g; the content of COOH-groups is 28.5% OUI, 1, 4 mgeq / g.

The ion exchanger is completely dissolved in water and 1% aqueous solutions of WaHCOj, HH, OH, WaOH.

PRI mme R 2. 10 g of air-dry hydroxyethyl cellulose containing 32.4% of the hydroxyethyl groups are oxidized with gas oxides of nitrogen at 20 C. After 10 days, the target product is washed with acetone until there is no free nitric acid and dried spirit Yield 9.28 g; COOHgroup content 32.1%) OJU. , 9 mg-eq / g PB, 8.7 mgEKv / g, 8 mg-eq / g.

Ionite is completely dissolved in water and in 1% aqueous solutions of NincOj, NHi, OH, NaOH.

Example South hydroxyethyl cellulose containing 32.4% hydroxyethyl groups, treated with a mixture consisting of 20 ml of liquid nitrogen oxides and 280 ml of cyclohexane at 20 ° C for 48 hours. The target product is washed with acetone and dried in air. Yield 11.0 g; the content of COOH-groups 32.3%, SOYU, 4 mEq / g Ca 5.2 mg eq / g.

Ionite 1 is completely soluble in water and 1% aqueous solutions of alkali trees.

Claims (1)

Invention Formula A method of obtaining soluble ion exchangers based on cellulose derivatives, characterized in that, in order to simplify the process and increase the exchange capacity, the hydroxyethyl cellulose is oxidized by oxides of eoeta.