汉麻二粗生物-氧化联合脱胶工艺

Enzymatic-oxidative degumming of Hanma Ⅱ Rough

为了减少化学试剂用量,降低脱胶废液污染,设计并探究了新型“生物酶-碱氧一浴-弱氧漂”短流程脱胶工艺,以残胶率为评价指标对工艺的可行性进行了探究。试验结果得出生物酶脱胶工艺为:pH值4.5、温度55℃、果胶酶质量浓度6 g/L、木聚糖酶质量浓度3 g/L、时间4 h。碱氧一浴脱胶工艺为:氢氧化钠质量分数8.5%、双氧水质量分数5%、温度95℃、时间3 h。弱氧漂脱胶工艺为:双氧水质量分数2%、时间1 h、温度95℃。与化学脱胶法脱胶样相比,生物酶-氧化脱胶最优样各个胶质组分含量相当,含杂率、长度、短绒率更优,脱胶废液COD和色度更低。

In order to reduce the amount of chemical reagents used and reduce the pollution of degumming wastewater,a new short-process degumming process of“biological enzyme-one bath alkali oxygen treating weak peroxide bleaching”is designed and explored,with residual glue rate as the evaluation index.The optimal process is determined as follows:biological enzyme degumming at 55℃for 4 h with pectinase concentration of 6 g/L,xylanase concentration of 3 g/L,and pH value of 4.5;The one bath alkali oxygen treating at 95℃for 3 h with alkali concentration of 8.5%and hydrogen peroxide concentration of 5%;The weak peroxide bleaching at 95℃for 1 h with hydrogen peroxide concentration of 2%.Compared with the chemical degumming method,the optimal sample of biological enzyme-oxidative degumming has comparable content of each colloidal component,better impurity rate,length and short pile rate,and lower COD and chromaticity of degumming waste liquid.