Among the studied substrates, phenol had the highest value of the maximum rate of the oxygen uptake, [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII], followed by p-cresol, 5-methylresorcinol
3] per day, containing 300-500 mg/L phenols, including relatively stable 5-methylresorcinol
and p-cresol, sulphide ions, polyaromatic hydrocarbons and other toxic compounds , are one of the greatest sources of contamination of surroundings and water in the region close to the Finnish Gulf and cause a high load on the wastewater purification system.
During the period of 1991-1998 intensive studies on chemical oxidation of different phenolic effluents (containing phenol, cresols, resorcinols, 5-methylresorcinol
Previously, the preparation of aerogels from 5-methylresorcinol
(MR) and 2,6-dihydroxy-4-methylbenzoic acid (dHMBA), has been studied in our laboratory.
In this study, 96% 5-methylresorcinol
(a product of Carboshale, Estonia) was used as a phenolic precursor for organic gel.
If water solutions contain organic compounds strongly absorbing UV light, then UV radiation usually does not give any additional effect to ozone because of the screening of ozone from the UV by optically active compounds such as phenol, 5-methylresorcinol
, xylenols, etc.
In the case of using 5-methylresorcinol
, it was shown that a much shorter preparation time as well as a stiffer structure due to the additional directing methyl group were advantageous compared to the use of resorcinol .
is an alternative precursor for aerogel preparation because its molecular structure is similar to other precursors used for this purpose.
This set includes altogether 9 different phenolic compounds: 5 monobasic phenols (phenol, p-cresol; 2,4-dimethylphenol; 2,3-dimethylphenol; 3,4-dimethylphenol) and 4 dibasic phenols (resorcinol, 5-methylresorcinol
, 2,5-dimethylresorcinol and 5-ethylresorcinol).
Trapido and Gubergrits studied the kinetics of oxidation and photooxidation of resorcinol and 5-methylresorcinol
in distilled water and in model Baltic Sea water .
Recently the theoretical basis of the method was described and the characteristic constants were found using 5-methylresorcinol
, the main water soluble phenolic compound produced at the retorting of kukersite, as alkylresorcinol .
At the same time GPC/13C NMR analysis shows that the co-condensates of methylolphenols with resorcinol and 5-methylresorcinol
are quite similar with dominating content of 4,o- and 4,p-methylenes.