| 摘要 |
<p>A method to purify an aqueous solution of an alkali metal hydroxide by countercurrently contacting the ammonia and hydroxide, in a volume ratio of from 0.6:1 to 1:1, in a packed bed. The temperature in the lower portion of an extractor in which the process is carried out is controlled and maintained within a range of from 68o to 77oC. </p> |
