Polyalkylphenyl-sulphonic acid with acid groups of variable strength from compost.
The insoluble organic fraction (humin-like material, HLM) from rice hull-dairy cattle compost is well converted into water soluble HLM-sulphonate by reaction in liquid SO3. Microanalytical, potentiometric, molecular weight, and NMR data are consistent with a highly homogeneous polymeric arylsulphonate having 4000 Da MW, 1.3 sulphonic groups per aromatic ring and significant content of carboxylic and phenolic groups. By comparison with structure-property relationships for commercial lignosulphonates derived from the pulp and paper industry, the above arylsulphonate is likely to be a candidate at a variety of applications in the chemical industry and in agriculture. Therefore, sulphonation is a means for upgrading composts HLM to the same uses as for commercial lignosulphonates.
Montoneri
E
E
Dipartimento di Chimica Generale ed Organica Applicata, Università di Torino, Corso Massimo D'Azeglio 48, 10125 Torino, Italy. enzo.montoneri@unito.it
Savarino
P
P
Adani
F
F
Genevini
P L
PL
Ricca
G
G
Zanetti
F
F
Paoletti
S
S
D000383:Agriculture; D000818:Animals; D002417:Cattle; D002617:Chemical Industry; D003247:Conservation of Natural Resources; D007220:Industrial Waste; D012275:Oryza; D010209:Paper; D011108:Polymers; D012037:Refuse Disposal; D013451:Sulfonic Acids / Q000032:analysis*
D007220:Industrial Waste; D011108:Polymers; D013451:Sulfonic Acids