对HPF法焦炉煤气脱硫装置产生的脱硫废液,采用添加CuSO4的方法生成硫氰酸亚铜,确定了影响产品质量的因素及相应的工艺流程。结果表明,经孔径30μm左右的滤纸过滤,采用脱硫废液加入到CuSO4溶液中的方式,每500 mL CuSO4溶液(Cu2+的浓度与...对HPF法焦炉煤气脱硫装置产生的脱硫废液,采用添加CuSO4的方法生成硫氰酸亚铜,确定了影响产品质量的因素及相应的工艺流程。结果表明,经孔径30μm左右的滤纸过滤,采用脱硫废液加入到CuSO4溶液中的方式,每500 mL CuSO4溶液(Cu2+的浓度与废液中SCN-的浓度相同)废液添加量为600 mL,反应控制pH在1～3、温度为常温,在此适宜的条件下,收率可达到80%以上,产品纯度可达到97%以上。脱硫废液制备CuSCN的工艺简单,处理后的脱硫废液COD由约160 g/L降至10 g/L,经生物脱酚脱氰处理后可达到GB 13456—92的二级外排标准,所得清液可作为熄焦用水循环使用。展开更多
Polymerizations of methyl methacrylate(MMA) initiated by lithium homocuprate and lithium {heterocuprate} from cuprous thiocyanate in tetrahydrofuran solution were carried out. Polymerizations initiated by lithium homo...Polymerizations of methyl methacrylate(MMA) initiated by lithium homocuprate and lithium {heterocuprate} from cuprous thiocyanate in tetrahydrofuran solution were carried out. Polymerizations initiated by lithium homocuprate were sensitive to the mass ratio of monomer to initiator and reaction temperature. At {-10 ℃}, with the increase of the mass ratio of monomer to initiator, the molecular weight of PMMA increased and the color of the reaction system response got more and more darker. This was often the signal of the thermal instability of organocopper. This may hint that the living end had already been destroyed. Low reaction temperature made the initiator efficiency obviously dropping. In addition, with the decrease of reaction temperature, syndiotactic degree of PMMA increased. Polymerizations initiated by lithium heterocuprate showed that heterocuprate was more efficient initiators than homocuprate. Under the same reaction conditions, PMMA from polymerization initiated by heterocuprate had narrower MWD and higher syndiotactic degree.展开更多
文摘Polymerizations of methyl methacrylate(MMA) initiated by lithium homocuprate and lithium {heterocuprate} from cuprous thiocyanate in tetrahydrofuran solution were carried out. Polymerizations initiated by lithium homocuprate were sensitive to the mass ratio of monomer to initiator and reaction temperature. At {-10 ℃}, with the increase of the mass ratio of monomer to initiator, the molecular weight of PMMA increased and the color of the reaction system response got more and more darker. This was often the signal of the thermal instability of organocopper. This may hint that the living end had already been destroyed. Low reaction temperature made the initiator efficiency obviously dropping. In addition, with the decrease of reaction temperature, syndiotactic degree of PMMA increased. Polymerizations initiated by lithium heterocuprate showed that heterocuprate was more efficient initiators than homocuprate. Under the same reaction conditions, PMMA from polymerization initiated by heterocuprate had narrower MWD and higher syndiotactic degree.
