SU1490077A1 - Method of modifying clinoptylolite - Google Patents

Abstract

The invention relates to a technique for modifying clinoptilolite used as a sorbent for improving water, and allows an increase in the exchange capacity and the softening ability of the product. Modification of clinoptilolite is carried out with a solution containing wt. 5%. sodium phosphate or ammonium and wt.0,02% diphenylamine, at T: W = 2: 1 for 2 hours. Exchange capacity of the product 14 - 16 mg ^. eq / l

Description

The invention relates to a technique for modifying clinoptilolite used as an adsorbent for softening water.

The aim of the invention is to increase the exchange capacity and the smarting ability of the product.

Example 1 2 kg of pre-ground, with a granule size of 3 mm, clinoptilolite is placed in a container and 1 liter of a solution containing 5% by weight of ammonium phosphate of monosubstituted () and 0.02% by weight of diphenylamine is added, and 2 times of ground source is taken product at 1 pbw of solution and left at room temperature for two hours, then washed twice.

To establish the sluggish ability and exchange capacity of the modified zeolite, water is subjected to a general hardness.

15.86 mg-eq / l, carbonate hardness 2.40 mg-eq / l, containing, mg / l: Ca 254.5; Mg 37.7; (Na + K) 270.2; , 6; Cl 591; NSO, 146.4; dry residue - 1150 mg / l and pH 7.2.

Water of such composition is passed in columns with a diameter of 15 mm and a height of 140 cm, loaded with modified clinoptilolite with a height of filtering layer 70 mm, i.e. in the amount of 58 g (d 0,83). Duration of water stay in the contact tank for at least 15 minutes. During this period, cations, such as calcium, magnesium and others, are absorbed. After passing 100 column volumes of the mentioned chemical composition of water, the total hardness was 0.8 mEq / l, carbonate hardness — 0.1 mg eq / l, content, mg / l: Ca 8.5; Mg 2.4; (Na + K)

(L

I

4 WITH

262; SOf 80.0} Cl 574; ,; dry residue 725 mg / l and pH 7.0.

Example2. 2 kg of the ground clinoptilolite described in Example 1 are treated analogously to Example 1, but ammonium phosphate is disubstituted (NH4) 2HP04.

After passing 100 column volumes of water, as in Example 1, its total hardness was 0.3 mEq / L; carbonate hardness 0.05 mg-eq / l, content, mg / l: Ca 4.2; Mg 1,2; (Na + K) .258; SO 78.0; Cl 518; NSO; 3.0, dry residue 730 mg / l, pH 7.1

Example 3, 2 kg of crushed clinoptillow, described in example 1, are treated as in example 1, but ammonium phosphate (trisubstituted) is taken

After passing 100 column volumes of water, analogously to example 1, its total hardness was 0.13 mg-eq / l; carbonate hardness 0.04 meq / l, content, mg / l: Ca 2.1; Mg 0.5; (Na + K) 255; S0 75.5 | C1 565; CNS, 1.6; dry residue 735 mg / l, pH 7.3.

The exchange capacity determined in all three examples is 14-16 mg-eq / g. Similar results were obtained using sodium phosphate.

The exchange capacity of the clinoptic modified prototype is 5.06 mEq / g;

The overall capacity reduces the total water hardness from 15.86 to 2.08 mg-eq / l, carbonate from 2.40 to 0.31 mg-eq / l.

When using the modified clinoptypolite according to the proposed method, but within 1 h, its intelligence decreases. After passing through the second section of the contact sump, the water hardness in all cases decreases to 0.01 mg-eq / l, and carbonate hardness to 0.003-0.005 meq / l. Thus, the clinoptnolith modified by the proposed method can be used to soften hard waters, the hardness of which, compared with the prototype, decreases, and the exchange capacity of the product increases by 3-4 times.

Claims (1)

Invention Formula A method of modifying kinoptilolite, which includes treating a pre-ground clinoptilolite with a modifying solution and washing, characterized in that, in order to increase the exchange capacity of the product, a solution containing 5% by weight of sodium or ammonium phosphate and 0.02% by weight is used as a modifying solution diphenyls - on, and the treatment is carried out at T: W 2: 1 for 2 hours.