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Now showing items 17 - 19 of 19

  • Dechlorination of zinc dross by microwave roasting

    Wei Ya-qian   Peng Jin-hui   Zhang Li-bo   Ju Shao-hua   Xia Yi   Zheng Qin   Wang Ya-jian  

    Traditional treatments of zinc dross have many disadvantages, such as complicated recovering process and serious environmental pollution. In this work, a new process of chlorine removal from zinc dross by microwave was proposed for solving problem of recycling the zinc dross. With better ability of absorbing the microwave than zinc oxide, the main material in zinc dross, chlorides, can be heated and evaporated rapidly during microwave roasting. Various parameters including roasting temperature, duration time and stirring speed were optimized. The microstructure of roasted materials was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The content of the chloride was analyzed by the method of chlorine ion selective electrode. The experiments indicate that the best duration time is 60 min with a stirring speed of 15 r/min during the microwave roasting process. The dechlorination rate reaches peak value of 88% at 700 degrees C. The chlorine is removed as HCl gas when water vapor is used as activating agent, which means that it can be recovered into hydrochloride acid.
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  • Discussion of “ Static Equilibrium Bays: New Relationships ” by John R. C. Hsu, Richard Silvester and Yi‐Min Xia (May, 1989, Vol. 115, No. 3)

    Tan, S. K.; Chiew, Y. M.  

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  • Engineering wild-type robust Pediococcus acidilactici strain for high titer l- and d-lactic acid production from corn stover feedstock

    Xia Yi   Peng Zhang   Jiaoe Sun   Yi Tu   Qiuqiang Gao   Jian Zhang   Jie Bao  

    Graphical abstract Highlights • Two robust P. acidilactici strains for l -/ d -lactic acid production using lignocellulose biomass as feedstock were constructed. • Over 76 g L −1 of l -/ d -lactic acid was produced from 25% (w/w) corn stover content. • l -/ d -Lactic acid yield and productivity using lignocellulose as feedstock highly depend on the lignocellulose derived inhibitor levels. Abstract Pediococcus acidilactici TY112 producing l -lactic acid and P. acidilactici ZP26 producing d -lactic acid, were engineered from the wild-type P. acidilactici DQ2 by ldhD or ldh gene disruption, and the robustness of the wild-type strain to the inhibitors derived from lignocellulose pretreatment was maintained well. In simultaneous saccharification and fermentation (SSF), 77.66 g L −1 of l -lactic acid and 76.76 g L −1 of d -lactic acid were obtained at 25% (w/w) solids content of dry dilute acid pretreated and biodetoxified corn stover feedstock. l - and d -Lactic acid yield and productivity were highly dependent on the inhibitor removal extent due to the significant down-regulation on the expressions of ldh and ldhD encoding lactate dehydrogenase by inhibitor, especially syringaldehyde and vanillin at the low concentrations. This study provided a prototype of industrial process for high titer l - and d -lactic acid production from lignocellulose feedstock.
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