| 摘要 |
A process for treating an aqueous solution having a pH of 4 or greater, the solution comprises at least one phthalate ion or salt of formula (I), wherein m is 0, 1, 2, 3 or 4 and R is a C1 to C8 hydrocarbyl or OR2, R2 is H or C1 to C8 hydrocarbyl and when more than one R group is present the R groups may be the same or different. The process involves contacting the aqueous solution with a first material comprising a layered double hydroxide of formula [Mz+1-xAlx(OH)2]q+(Xn-)q/n.yH2O for a predetermined time, wherein M is a metal cation, z is 1 or 2, x is 0.1 to 1, y is 0 to 5, X is an anion, n is 1, 2 or 3 and q is determined by x and z. The aqueous solution to be treated may further comprise at least one aliphatic carboxylic acid, for example adipic acid, succinic acid, butyric acid, propionic acid, acetic acid or formic acid. Preferably, the anion (X) of the layered double hydroxide is a halide or nitrate. The alkaline solution may be an alkaline waste effluent from an anthraquinone process for the production of hydrogen peroxide. |
