凡纳滨对虾下脚料生产甲壳素过程中盐酸的循环利用

为减少甲壳素生产过程中废酸液对环境的污染,降低甲壳素的生产成本,试验以甲壳素生产过程中的废盐酸为研究对象,利用硫酸和氯化钙反应进行回收、循环利用盐酸溶液,通过单因素试验和正交试验对工艺条件进行优化。结果表明,脱钙废盐酸溶液最佳再生条件:反应温度为室温,硫酸质量分数为98%,硫酸与废盐酸中钙离子的摩尔比为2.3∶1,反应时间13 min,静置时间3.5 h,最佳条件下盐酸再生率为91.51%。利用最佳工艺条件对废盐酸进行再生处理,盐酸可循环重复利用5次,脱钙虾壳的碳酸钙残留量≤1.2%。

Recycling of waste hydrochloric acid during chitin production process from Litopenaeus vannamei processing leftover

To decrease environment pollution and reduce the cost of in production of chitin,the waste hydrochloric acid in the process of chitin production was studied,and the process conditions were optimized by single factor test and orthogonal test,using the reaction of sulfuric acid and calcium chloride to recover and recycle hydrochloric acid solution.The best regeneration parameters were obtained:room temperature,concentration of the sulfuric acid of 98％,the molar ratio of sulfate radical and calcium ion of 2.3:1,reaction time of 13 min,standing time of 3.5 h.Under these conditions,the regeneration rate was 91.51％,and the hydrochloric acid could be recycled five times and the calcium carbonate residues of the shrimp shell were no less than ≤1.2％.