蓖麻油裂解制备癸二酸过程中碱的回收工艺探究

Study on Recovery of Alkali in the Products of Castor Oil Cracking

传统的蓖麻油裂解制备癸二酸工艺中由于使用过量的碱和稀释剂邻甲酚而产生了大量的含盐含酚废水。本文在制备癸二酸的工艺中,选用毒性较小的液体石蜡作为稀释剂,从而避免了含酚废水的污染问题,同时主要针对裂解过程中因过量碱的使用而产生的含盐废水问题,研究了溶剂种类、用量对碱浸出性能的影响。结果表明,选择溶剂甲醇为浸取剂时,对裂解液中的碱具有高选择性;当溶剂用量为V(甲醇)∶V(裂解液)=6∶1,浸取次数2次,碱的回收率达到了83.3%。

The traditional preparation process of sebacic acid by castor oil cracking could cause serious environment pollution because of using excessive caustic soda and phenol as the diluents. Using liquid paraffin as the diluents could greatly avoid the production of phenolic wastewater. However, the large amount of alkali would produce numerous salinity wastewater. So this research work was undertaken with a view to study the effect of solvents and its volume on the leaching performance of excessive sodium hydroxide in the products of castor oil cracking. The results showed that the methanol exhibited high leaching selectivity towards sodium hydroxide. The optimum separation condition as follows：V（ methanol）∶V（castor oil）=6∶1, leaching stage was two, the recovery of alkali could be up to 83. 3%.