制备2-甲基萘醌时废液中Cr和CH3COOH的测定

在制备2-甲基萘醌时,通过测定废液中不同价态铬的含量,得知当反应结束体系中n(Cr(Ⅲ))∶n(Cr(Ⅵ))=2.10∶1时,产品的收率最高,质量最好,与对应的原料比为n(CrO3)∶n(2-甲基萘)=6.41∶1;通过测定废液中CH3COOH的含量,得知其含量大大减少,初步推断废液中Cr(Ⅲ)主要以Cr(OCOCH3)3的形式存在,并可确定在下次反应时回收利用CH3COOH的量.     

停留时间对富含藻类水厂排泥水污泥调质的影响

测定污泥Zeta电位、化学需氧量(CODCr)及污泥比阻随时间的变化规律,研究了富含藻类水厂排泥水停留时间对污泥性质的影响,以及污泥性质变化对投药量的影响。结果表明,前24h污泥脱水性能恶化较快,污泥比阻由174×1011m·kg-1迅速上升至259×1011m·kg-1,24～72h污泥脱水性能变化不大;污泥在浓缩池内停留24h,调质投药量增加约5%;污泥上清液Zeta电位对污泥调质影响不大。     

强韧化处理对3Cr2W8V热锻模寿命的影响

通过对 ３ Ｃｒ２ Ｗ８ Ｖ 热锻模失 效组织 的电镜 观测 和 对断 裂韧 性 Ｋ Ｉ Ｃ 值的 测定 ，认 为 Ｋ Ｉ Ｃ 值 偏 低是３ Ｃｒ２ Ｗ８ Ｖ 热锻 模早期开 裂和热 疲劳的主 要原因 实践 证明， 采用 １ ２００ ℃ 高 温淬 火 和６８０ ℃高 温 回火（ 即高淬 高 回） 的 新 工 艺， 能 大 幅 度 提 高 材 料的 Ｋ Ｉ Ｃ 值， 延 长 该 类 模 具 寿 命 ４ 倍 左 右  因 而 Ｋ Ｉ Ｃ 值 是３ Ｃｒ２ Ｗ８ Ｖ 热锻 模的主 要韧性指 标，而冲 击韧性α Ｋ 值仅 能作为 参考图 ２ ，表 １ ，参６      

Hydrogen absorption-desorption characteristic of (Ti0.85Zr0.15)1.1Cr1-xMoxMn based alloys with C14 Laves phase

The microstructure and hydrogen absorption-desorption characteristic of (Ti_0.85Zr_0.15)_1.1Cr_1-xMo_xMn (x ?= ?0.05, 0.1, 0.15, 0.2 ?at.%) alloys were investigated. The results showed that the corresponding alloys were determined as a single phase of C14-type Laves structure. With the increase of Mo content, the maximum and reversible hydrogen absorption capacity decreased, the slope factor H_f increased. Among the studied alloys, (Ti_0.85Zr_0.15)_1.1Cr_0.95Mo_0.05Mn had the best overall properties for practical application of hydrogen storage materials. The maximum and reversible hydrogen storage capacity were 1.76 ?wt% and 1.09 ?wt%, the slope factor H_f was 0.51, and its dissociation enthalpy (ΔH_d) and entropy change (ΔS_d) were 23.1 ?kJ ?mol^?1H₂, 93.8J ?K^?1mol^?1H₂ at 303K, respectively. By studying the dissociation pressures of the synthesized metal hydrides, it was found that Mo had a special effect on the dissociation pressure of Ti–Zr–Cr–Mo–Mn alloys. Among the four alloys, (Ti_0.85Zr_0.15)_1.1Cr_0.95Mo_0.05Mn alloy had the largest hydrogen absorption capacity and the fastest hydrogen desorption rate, which can meet the commercialization demand of hydrogen fuel cell hydrogen supply system.