酸解法对甘氨酸母液脱色后废活性炭的再生研究

在用海因法生产甘氨酸的过程中,为了精制甘氨酸,需要用大量的活性炭对甘氨酸母液进行脱色,而脱色后的活性炭就成了废活性炭.为了实现废活性炭的再利用,针对此废活性炭用酸解法对其进行再生.研究了再生酸种类、浓度、用量、再生温度和再生时间等对废活性炭再生效果的影响,确定了适宜的再生条件:硫酸质量分数为70％,硫酸溶液与废活性炭的...

Regeneration of Used Activated Carbon from Decolorized Glycine Mother Liquor by Acid Decomposition Method

At the process of producting glycine by using Hydantoin Method, a lot of activated carbon is used to decolor the mother liquor of glycine to get the pure glycine. And the activated carbon becomes the used activated carbon. In order to realize recycling the used activated carbon, acid decomposition method is used to regenerate the used activated carbon. The effect of the kinds of acid, density, dosage, tempera- ture and retention time for the regeneration of activated carbon are systematically studied to ascertain the appropriate regeneration conditions. The first recovery rate of regenerated activated carbon can reach 94. 1% when mass ratio of 70% sulfuric acid and waste activated carbon is 1.5：1 ,temperature is 160℃ and processing time is 4 h. Experimental results indicate that the decoloring ability of regeneration of activated carbon after 2 times is the same as the new activated carbon under suitable condition. When the activated carbon is regenerated several times, the ability of decoloring is also above 80%.