Study On The Treatment Of Waste Gases From The Production Of Viscose Fiber

Aiming at the treatment problems of waste gases from the production of viscose fiber, a method of all-absorption is studied. Based on improving of solvents and operating conditions, and exploiting new methods and processes, a set of economical, efficient, stable running treating process is designed, which is expected to deal with both H2S and CS2.All-absorption in the research is a respective method with two kinds of absorbents according to different physical and chemical properties of H2S and CS2, in order to recover available substances and reduce production cost.For CS2, TCZ reagent is regarded as an efficient physical absorbent, which is in possession of innocuity, non-volatilization, little viscosity, inexpensive and easy-regeneration. TCZ can remove 95% or above CS2 from the low waste gases. Only by heating, regenerating rat can be more than 80%.For H2S, firstly, the effects of different conditions on the desulfurization efficiencies of chelate iron system are investigated. Via conditional experiments, the optimum conditions are obtained, on which 98.5% H2S can be removed. On the basis of many experimental data, a math model is established: # = a + b*exp[- (v)-i] + c* exp[- (L/G)-j] + d*exp[- (pH)-k], which is a reference for engineering design and desulfurization efficiency prediction.Secondly, the stability of chelate iron system is researched. As a result, the diagram of stability following absorbing time is obtained, and two kinds of modified chelate iron absorptions are exploited to improving stability greatly. The degrading quantities of two modified absorptions in 24h are only 12%, 10% of that of routine one, while the total desulfurization quantities of which are 5.63 and 6.41 times of that ofroutine one, respectively.Finally, a new kind of inorganic absorbing system- "Cu-Fe system" is contrived. That system is composed of two kinds of common inorganic salts, which has high desulfurization efficiency (more than 90%), fewer by-reactions, and can be oxidative regenerated by air for circulation.