FIELD: pulp and paper industry; chemical industry; methods of detection of the lignin substances in the waste waters of the sulfate-cellulose production.
SUBSTANCE: the invention is pertaining to the methods of the analysis of the technological solutions produced at the chemical reprocessing of the wood preferentially in the process of production of the pulp-and-paper products and may be used at the analysis of the waste waters of the production using the sulfate-cellulose processing technique. The technical result of the invention is provision of the express-control over the contents of lignin substances in the waste waters of the sulfate-cellulose production. The invention provides, that the method of detection of the lignin substances in the waste waters includes the treatment of the sample of the waste waters with the oxidation-reduction system based on the salts of cerium with the subsequent potentiometric indication of the variations taking place in the system and calculation of the contents of the lignin substances based on the results of the indication with usage of the earlier gained calibration dependence. The indicated oxidation-reduction system is prepared using 0.25±0.05 mole/l of the sulfuric acid at concentration of the oxidized form of 0.001±0.0005 mole/l. For obtaining of the calibration dependence the sample controlled by waste water is acidified with the sulfuric acid up to pH 4.0-4.5, age the solution for no less than 50 minutes, separate the solid phase of the formed suspension, flush it by the water up to its neutral reaction, dehydrate, the dehydrated solid phase is suspended in the water and the produced suspension is used for construction of the calibration dependence.
EFFECT: the invention ensures realization of the express-control over the contents of the lignin substances in the waste waters of the sulfate-cellulose production.
5 cl, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF DETERMINATION OF LIGNOSULFONIC ACID IN SULFITE SOLUTION | 1992 |
|
RU2054673C1 |
| METHOD FOR DETERMINING THE MASS CONCENTRATION OF LIGNIN SUBSTANCES IN NATURAL, WASTE AND TREATED WASTE WATER | 2022 |
|
RU2784776C1 |
| METHOD OF COMPLEX PROCESSING OF BIRCH WOOD | 2016 |
|
RU2620551C1 |
| METHOD OF PREVENTING CARAMELIZATION OF HYDROLYSATES OF VEGETABLE RAW MATERIALS | 1994 |
|
RU2081957C1 |
| BIOMASS LIQUEFACTION AT LOW pH | 2012 |
|
RU2617758C2 |
| METHOD AND SYSTEM FOR LIGNIN PROCESSING | 2014 |
|
RU2642787C2 |
| METHOD FOR PRODUCTION OF ETHANOL FROM CELLULOSE-CONTAINING WASTES (VERSIONS) AND METHOD FOR PRODUCTION OF GLUCOSE FROM CELLULOSE-CONTAINING WASTES | 1994 |
|
RU2159816C2 |
| METHOD FOR WITHDRAWAL OF TALL LIGNIN FROM WASTE WATER OF PRODUCTION OF RAW TALL OIL | 1992 |
|
RU2014282C1 |
| METHOD OF LACTIC ACID PRODUCING (VARIANTS) | 1995 |
|
RU2177036C2 |
| PROCESS OF INDUSTRIAL CELLULOSE PULP, NATIVE LIGNIN AND UNICELLULAR PROTEIN PRODUCTION, WHICH IS CARRIED OUT IN CATALYTIC REACTOR | 2005 |
|
RU2383675C1 |
