A standing and layering process for the regenerated acid purification is described.The treating agent ANPA is added in regenerated acid and stood after agitation to purify it through layering.

• 介绍了净化再生酸的静置分层法,将处理剂ANPA加入再生酸中，搅拌后静置，使再生酸分层分离而得到净化。