Study On The Separation Of Waste Polyester-cotton Blended Fiber

Waste polyester/cotton blended products such as the polyester components derived from petrochemical and other energy products, which has non-degradable nature. Its wastes through burying, burning and other way processing are not only waste of resources,but also w have adverse effects on the environment. So considering the separation of the waste polyester/cotton blended products and recycling polyester is necessary. In this paper, the waste polyester/cotton (65/35) blend fibers were studied by different separation process recycling polyester, and to explore the various process parameters on the separation effect.This paper using two ways of dilute acid hydrolysis and enzyme hydrolysis with pre-treatment in the separation of waste polyester/cotton (65/35) blended fibres.The separation methods were optimized and obtained the best separation process. Finally, this article analyzed the social economic benefits and environmental benefits of the two kinds of separation methods.Firstly, dilute acid was used to separate the waste cotton/polyester (65/35) blended fibers and the recycling process of polyester was studyed. Orthogonal experiment and the method of single factor experiment were used to inspect the factors such as mass fraction of hydrochloric acid, reaction time, reaction temperature and solid-liquid on the effect of the separation and recycling polyester. Research shows that, the influence factor of significant size is as follows: the reaction time> hydrochloric acid mass fraction> temperature> solid-liquid ratio. The optimum process is:hydrochloric acid mass fraction10%, solid-liquid ratio40g/L, temperature of95℃, reaction time90min.After reaction, polyester into the fiber and the cotton fiber hydrolysis into tiny powder. On this basis, we established a polynomial.mathematical model for the separation of waste cotton/polyester (65/35) blended fibers. Discusses the factors of influencing the separation effect of interaction between the mathematical model, and optimized the best separation process parameters:hydrochloric acid concentration is10.7%, the quality of reaction temperature is96.5℃, the response time for98min, solid and liquid43g/L. Small changes in other parameters, the reaction liquid solid-liquid ratio increased by7.5%. Secondly, cellulose enzyme was used to separate the waste cotton/polyester (65/35) blended fibers and the recycling process of polyester was optimized. Through the single factor experiment and orthogonal test, the factors of the enzyme concentration, substrate concentration, and PH value and effect time on the separation were studyed. Research shows that, the influence factors of significant size in order as:the enzyme concentration> substrate concentration> digestion time> PH value. The optimized separation technology is:the enzyme concentration2%, substrate concentration3%, enzymatic hydrolysis time for36h, and PH value for five. The establishment of the quadratic regression orthogonal combination reaction model for the prediction of the separation and analysis.Finally, through the social analysis of economic and environmental benefits obtained, this study has certain social and economic benefits; with the production scale of development will provide a significant number of jobs and promote employment. Trials have been treated wastewater reached the national emission standards to avoid secondary pollution of the environment. In this paper waste blended fiber resource recycling has certain reference significance.