The method of concentration of 2-naphthol in aqueous solutions

 

(57) Abstract:

The invention relates to analytical chemistry of organic compounds and can be used for concentration of 2-naphthol in analytical control of treated wastewater enterprises producing and using synthetic dyes. The concentration of 2-naphthol in aqueous samples is carried out by extraction of the mixture in the following ratio, wt.%: nonan 30-0, hexanol 70-100. The mixture is pre-applied on the polyurethane foam. Effect: achieve almost complete removal of 2-naphthol with the concentration factor of constituting 340-350. table 2.

The invention relates to analytical chemistry of organic compounds and can be recommended for the concentration of 2-naphthol in analytical control of treated wastewater enterprises producing and using synthetic dyes.

As a prototype of the selected method of extraction concentration of 2-naphthol in aqueous solutions by geksanalem (I. I. Korenman, Extraction of phenols. Bitter: The Volga-Vyatsk. publishing house, 1973. - S. 177).

The disadvantage of a low coefficient of concentration.

Tehnicheskaya is achieved by that way the concentration of 2-naphthol in aqueous solutions, including extraction, what's new is that the extraction is carried out with a mixture of pre-applied polyurethane foam, in the following ratio, wt.%: nonane 30-0, hexanol 70-100.

The method is as follows. Prepare a mixture in the ratio 30-0 wt. % nonane and 70-100 wt.% hexanol. The mixture soaked cut from sheet foam tablets with a thickness of 1 cm and a diameter of 13 cm, weight tablets to 0.060-0.001 g, the mass of the tablet with a mixture of organic solvents 0,075-0,003, 25 cm3aqueous solution of 2-naphthol make the tablet polyurethane foam, shake on vibromaster 15 minutes In the solution, find the equilibrium concentrations of 2-naphthol by the reaction with diazotized sulfanilic acid. The organic phase is transferred 96,0-98.5% of 2-naphthol in comparison with the original content in the analyzed water sample; the ratio of the concentration is 340-350.

Examples of the method

Example 1 (the prototype).

To 25 cm3the sample containing 2-naphthol, add 2 cm3hexanol and extracted on vibrometer. After separation of phases selected 5 cm3stump extraction

R=(ARef-Aequally)*100/ARef, %,

where aRefand aequallyoptical density of the initial and equilibrium solutions, respectively.

The coefficient of concentration (provided almost complete extraction R=96-99%) calculated as the ratio of

K=mwater/morg,

where mwaterand morgweight of aqueous and organic phases, respectively.

The prototype R=98,3%, K=15,2.

Example 2 (in the absence of a solvent mixture).

To 25 cm3the sample containing 2-naphthol, add tablet polyurethane foam, not treated with a mixture of solvents, is extracted on vibrometer. Select the aqueous phase, add a solution of diazotized sulfanilic acid, photometrate. The extraction rate is 83%.

Example 3 (the lower limit of the claimed content of hexanal).

To 25 cm3the sample containing 2-naphthol, add tablet polyurethane foam, impregnated with a mixture containing 31 wt.% nonane and 69% of hexanol, extracted on vibrometer. Select the aqueous phase, add a solution of diazotized sulfanilic acid, photometrate. The degree of extraction is 94,2% (which is presented in the table.1, illustrate the results of the extraction sorption extraction of 2-naphthol in the stated interval mass ratios hexanol and nonane.

Comparative characteristics of known and proposed methods of concentration are given in table.2. The proposed solution allows more than 20 times to increase the concentration factor of 2-naphthol, to reduce the amount of toxic solvent, thus providing a practically complete recovery.

The method of concentration of 2-naphthol in aqueous solutions, including extraction, characterized in that the extraction is carried out with a mixture of pre-applied polyurethane foam, in the following ratio, wt. %:

Nonan - 30-0

Hexanol - 70-100

 

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