CS212930B1 - Method of regeneration of polymerous sorption materials with contents of anion and dispersion dyes and dyer interproducts - Google Patents

Description

The invention relates to the regeneration of polymeric sorbent materials based on polyester, polyamide and combinations thereof containing anionic or disperse dyes and cotton intermediates, wherein the regeneration takes place in an aqueous medium in the presence of chlorine gas or water-soluble salts of its oxoacids.

The polymeric sorbent materials used in the washing after printing and dyeing with anionic and disperse dyes according to PV 8373-79 to 8375-79, or in the method of waste water treatment of laundries and dyes (IV 6845-79) gradually lose their sorption ability. As a result, the usefulness of the polymeric sorbents is limited. The only way to reuse them is by regeneration, which removes sorbed dyes from the polymeric sorbents and thereby restores their sorption ability.

Existing processes for washing and purification of waste water, where the use of polymeric sorption materials is applied, do not deal with specific recovery options.

The present process of regenerating polymeric sorbent materials based on polyester, polyamide and combinations thereof in any ratio to each other is based on an aqueous process. Sorbed anionic or disperse dyes, eventually dyes

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212 930 are resolved by the action of chlorine gas or water-soluble salts of its oxo acids, in particular hypochlorite and sodium chlorite. The resulting cleavable water-soluble products and substances of reduced molecular size are thus removed from the regenerated sorbent by subsequent washing. The described mechanism of cleavage can be performed over the entire pH range. The improved regeneration effect can be achieved by a final alkali-bath rinse bath, by which the resulting cleavage products of the removed dyes are transferred to the more easily removable water-soluble salts. . j

The regeneration in the aquatic environment, which is the subject of the present procedure, brings and some other benefits. It does not require special equipment for regeneration, as it would be the case with regeneration from organic solvents. The sorbent can be regenerated directly in the wet state and after regeneration it can be used immediately without drying. For the regeneration in the aqueous environment according to the present process, chemicals in textile refinements are commercially available and inexpensive. It is surprising that the possible cleavage products of the dyes to be removed do not affect the repeatability of the regenerated eorbents. Said regeneration conditions preclude a change in the structure and thus the sorption capacity of the polymeric absorbents. The proposed regeneration system also does not create problems in the field of water management.

Said method of regeneration, which is characterized by minimal time, technological, economic and ecological demands, allows the re-use of polymeric absorption. materials in pressure washing and dyeing as well as in wastewater treatment processes. This significantly reduces the costs associated with the application of these eorbents 1 at their higher purchase price.

Examples

Example 1:

Polymeric sorbent based on polyester, used in pressure washing by a combination of reactions

Λ tivnieh and disperse dyes were suspended in water. A natural aqueous dispersion of 1 kg of sorbent (1:10 weight ratio) was further bubbled through with chlorine gas at a flow rate of 4.10 ^-1 l.min ¹ corresponding to 35 g of chlorine. kg ^-1 sorbent, at 20 ° C for min. Finally, washing with hot and cold water. Thus regenerated aor-;

The bent showed unchanged results after re-use in the post washing process.

Example 2 »ΐ

The polymeric sorbent of Example 1 was treated with a β regenerating water bath containing 280 g of NaClO. ¹ kg of sorbent prepared from:

4g act. Cl. 1 in the form of sodium hypochlorite (160 g act. Cl. 1 ^x )

gl ¹ sodium carbonate kale. (pH 8.5) bath 1:10, temperature 60 ° C, time 30 min.

After the final rinsing with hot and cold water to a negative CIO reaction, the sorbent was reused in the washing process. The same results are achieved.

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Example δ. 3

Polymeric sorbent according to Example 1 was regenerated with the procedure of Example 2 except that instead of sodium carbonate was added to 1 gl ¹ sulfuric acid (96%) and temperature of 50 ° C regeneration. PH reached 3.5. The regenerated sorbent showed unchanged properties in the washing process.

Example 4

The polymeric sorbent of Example 1 was treated in a water bath containing only 4 g of act. Cl. l ¹ in the form of sodium hypochlorite (160 g act. Cl. I ^-1), i.e. 280 g NaClO. . kg ^-1 sorbent. Under the same conditions as in the regeneration of Example 2, the same results were obtained.

Example 5

The polymeric sorbent of Example 1 was treated with a regeneration bath of 1 gl ¹ sodium chlorite 80% (10 g.kg ^-1 sorbent)

gl ¹ Sulfuric acid 96% (pH 3.5) in aqueous medium at a bath length of 1:10. for 30 min at 80 ° C. Rinse hot and cold water until negative reaction to ClO 2.

Example 6

Eorbent polymer according to Example 1 was processed under the conditions of example 3 or 5 with the fact that after regeneration followed by boiling an alkaline rinse bath containing 70 1:10 β ¹ g.kg sorbent sodium carbonate slurry. (pH 11). Processing time 5 min. The regenerated eorbent exhibited an unchanged sorption capacity when reused.

Example 7

The polymeric adsorbent of Example 1 was treated as in Example 6 and characterized in that instead of sodium carbonate, the same pH in the alkaline treatment was achieved by the addition of alkaline hydroxide. The resulting sorption ability remained unchanged.

(Example 8 i

To achieve a higher effect, the polymeric sorbent of Example 1 was the same

The result of the treatment is crazy.

_(First regenerative lasagna according to Example 3 under unchanged conditions with time shortened to 15 minutes.

The second regeneration was carried out under the conditions of Example 5 again for 15 min.

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Example δ. 9

Instead of the polyester-based polymeric sorbent of Example 1, other polyamide-based polymeric sorption materials and its combination with the polyester in any ratio in the form of both a homopolymer and a copolymer were regenerated by all procedures in Examples 1-8.

Upon repeated use unchanged sorption efficiency was achieved. In all cases, the sorption and regeneration process can be repeated in a closed cycle.

Example No. 10

The sorption materials of Examples 1 and 9 used in the wastewater treatment process were regenerated according to the procedures of Examples 1-8. Re-use of wastewater treatment achieved the same results as with the newly produced sorbent.

Claims (1)

Process for the regeneration of polymeric sorbent materials based on polyester, polyamide and combinations thereof in the form of copolymer 1 homopolymer, containing sorbic anionic and / or disperse dyes and / or barium intermediates, characterized in that the sorbent is treated with chlorine gas in an aqueous medium 50 g of chlorine. kg of sorbent or water-soluble salts of its oxoacids at concentrations of 5 - 350 g.kg of sorbent, the process being carried out over the entire pH range, whereupon the aorbent is washed with water —T or preferably an alkaline solution containing 30-90 g.kg of carbonate sorbent sodium kale. or an alkali hydroxide.