FIELD: chemical technology. SUBSTANCE: method involves sorption of sorbic acid by sewage passing through the layer of polyethylene-polyamine weak-base anion-exchange resins. Obtained filtrate is fed for biological treatment, where sorbic acid concentration must not exceed 5 ml/l. following by regeneration of anion-exchange resins. Regeneration process involves periodical closed-type circulation up to value pH 7.0-7.3 by regeneration solution following by washing of anion-exchange resin with water by countercurrent with regard to alkali solution circulation. Sorbic acid is precipitated from obtained regeneration solution with hydrochloric acid at 4-10 C following by recrystallization of sorbic acid at 93 C in the presence of charcoal at molar ratio sorbic acid: charcoal = 1: 2. EFFECT: improved method of sorbic acid isolation. 4 cl, 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF RECOVERING SORBIC ACID | 1994 |
|
RU2074165C1 |
| METHOD OF REMOVING CHROMATES FROM WASTE WATER | 1996 |
|
RU2104958C1 |
| METHOD OF REMOVING METAL SALTS FROM WASH WATERS | 1997 |
|
RU2133708C1 |
| METHOD OF REMOVING SOLUBLE MERCURY COMPOUNDS FROM WASTE WATERS | 1997 |
|
RU2114065C1 |
| METHOD OF PREPARING MODIFIED SORBENT | 1996 |
|
RU2105015C1 |
| METHOD OF POLYVINYL ALCOHOL SYNTHESIS | 1989 |
|
SU1713251A3 |
| METHOD OF PREPARING CARBON-CONTAINING SORBENT FOR REMOVING MERCURY | 1999 |
|
RU2172644C2 |
| METHOD OF EXTRACTING SILVER FROM SPENT PHOTOGRAPHIC SOLUTIONS, WASHING AND SEWAGE WATERS | 1999 |
|
RU2165468C1 |
| METHOD OF PURIFYING WASTE WATER FROM NONFERROUS METALS | 1993 |
|
RU2071947C1 |
| METHOD OF SEWAGE PURIFICATION FROM MERCURY COMPOUNDS | 1994 |
|
RU2064898C1 |
