公开(公告)号：US3714244A

公开(公告)日：1973-01-30

申请号：US3714244D

申请日：1971-04-06

Applicant: TOA GOSEI CHEM IND

Inventor： OKADA Y ,  MATSUBARA T

IPC: C07C55/21 ,  C07C51/00 ,  C07C51/47 ,  C07C51/50 ,  C07C67/00 ,  C07C51/42

CPC classification number: C07C51/47 ,  C07C51/50 ,  C07C55/21

Abstract: Crude 1,12-dodecanedioic acid obtained by oxidation of cyclododecanol and/or cyclododecanone by nitric acid is purified by dissolving the crude 1,12-dodecanedioic acid in an aqueous nitric acid solution containing 40 to 80 percent by weight of nitric acid at 85*-105*C, passing the resulting solution through a filter aid diatomaceous earth having particle sizes of 1-100 microns, cooling the resulting filtrate to 40*-90*C thereby to crystallize 1,12-dodecanedioic acid. The thus purified 1,12dodecanedioic acid has a good purity and a less susceptibility of discoloration appearing when dissolved in an alkali.

Abstract translation: 通过用硝酸将环十二烷醇和/或环十二烷酮氧化得到的粗制1,12-十二烷二酸通过将粗制的1,12-十二烷二酸溶解在含有40-80％（重量）硝酸的硝酸水溶液的85℃水溶液中进行纯化 -105℃，使得到的溶液通过一个具有1-100微米粒度的助滤剂硅藻土，将所得滤液冷却至40-90℃，从而使1,12-十二烷二酸结晶。 如此纯化的1,12-十二烷二酸具有良好的纯度，并且当溶解在碱中时出现较少的变色的易感性。