| 摘要 |
PCT No. PCT/FI86/00131 Sec. 371 Date Oct. 13, 1987 Sec. 102(e) Date Oct. 13, 1987 PCT Filed Nov. 21, 1986 PCT Pub. No. WO87/03314 PCT Pub. Date Jun. 4, 1987.Process for causticizing a water solution containing alkali carbonate with calcium oxide and hydroxide by bringing the water solution containing alkali carbonate into contact with the calcium oxide or hydroxide and by separating the alkali hydroxide solution arisen in the causticizing from the calcium carbonate precipitate. The water solution containing alkali carbonate is conducted through a bed which has been formed by mixing calcium oxide and calcium carbonate in the causticized alkali solution and by removing the excess alkali solution. |
