Chemiluminescence in evaluating thermal oxidative stability of acrylonitrile-butadiene-styrene (ABS) copolymers. IV. Comparative study of various stabilizers in mass polymerization and emulsion resins

The thermal oxidative stability of ionic and emulsion ABS with various antioxidants and UV stabilizers was studied. It was found that Santonox R provides better protection than Irganox 1076 to both resins. It is also the case in formulations with Tinuvin 770 and Tinuvin 328.     

氰化钠生产中聚合废料的利用

对氰化钠生产中的聚合废料进行了吸附试验和氰化钠含量分析，试验结果表明，聚合废料中含有２８％左右的氰化钠，其中黑褐色杂质可用活性炭吸附脱除。生产规模试验证明，用聚合废料为原料生产的硫氰酸钠，产品质量可达到装置设计指标，满足腈纶装置的使用要求。     

The basic properties of poly(lactic acid) produced by the direct condensation polymerization of lactic acid

Poly(lactic acids) with high molecular weights have been synthesized by direct condensation polymerization of lactic acid. These polymers have good mechanical properties and can be processed into products such as cups, film, and fiber, which can be used as compostable materials. This polymerization method can be applied to the synthesis of copolymers of lactic acid and other hydroxyacids. The properties of poly(lactic acid) and copolymers synthesized by the direct process are different from those of polymers obtained by the conventional lactide process.     

冷凝-催化燃烧法处理乙烯厂富含水蒸气的恶臭废气

采用冷凝-催化燃烧法处理乙烯厂富含水蒸气的恶臭废气,冷凝过程能够有效地脱除废气中的水蒸气、联苯和联苯醚,催化燃烧过程能够有效地脱除不凝气中的烃类化合物.催化燃烧反应器内装填Pr、Pd、Ce多组分蜂窝状催化剂,在床层空速为15900～40000h-4、反应器入口气温度为30～350℃的条件下,反应器入口气中总烃的体积分数为64.9×10-6～691.0×10-6时,出口总烃的体积分数可降至5.2×10-6～20.0×10-6,总烃的去除率为90%以上,处理后的气体符合国家排放标准.     

Biosynthesis and Characterization of Laccase Catalyzed Poly(Catechol)

Enzymatic polymerization of catechol was conducted batch-wise using laccase enzyme produced by the culture Trametes versicolor (ATCC 200801). The polymerization reaction was carried out in 1:1 (v/v) aqueous-acetone solution, buffered at pH 5.0 with sodium acetate (50 mM) in a sealed, temperature-controlled reactor at 25°C. The molecular weight of the produced polymer was determined with GPC. FT-IR, DSC, and TGA were employed to investigate the structure and thermal behavior of synthesized poly(catechol). It was found that catechol units were linked together with ether bonds and thermal stability of the catechol increased in the poly(catechol) polymeric structure effectively. The number average molecular weight of poly(catechol) was found as 813 ± 3 Da with a very narrow polydispersity value of 1.17 showing selective polymerization of catechol by the enzyme.     

负载型纳米TiO2光催化剂的制备及其光催化活性

采用悬浮聚合法制备粉煤灰-聚苯乙烯微珠载体,通过矿化接枝技术将水热法制备的纳米TiO2负载在粉煤灰-聚苯乙烯微珠载体上,制成负载型纳米TiO2光催化剂。用x射线衍射仪、扫描电子显微镜对负载型纳米TiO2光催化剂进行了表征;通过光催化降解甲醛实验评价了负载型纳米TiO2光催化剂的活性。实验结果表明,纳米TiO2在载体上分散良好,平均粒径为36．4nm;该催化剂活性较高,明显优于粉体纳米TiO2光催化剂,重复使用10次左右,该催化剂的活性无明显下降。     

聚硅酸硫酸铁混凝剂的性能研究

以硅酸钠、硫酸和硫酸铁为原料制备聚硅酸硫酸铁混凝剂（简称ＰＦＳＳ）,考察了ＰＦＳＳ在不同条件下水解产物表面的ζ电位变化情况,研究了Ｆｅ／ＳｉＯ２摩尔比和投加量对ＰＦＳＳ除浊效果的影响,试验了ＰＦＳＳ的最佳混凝ｐＨ范围与Ｆｅ／ＳｉＯ２摩尔比之间的关系,探讨了其混凝机理．结果表明,Ｆｅ／ＳｉＯ２摩尔比对ＰＦＳＳ水解产物的ζ电位、ＰＦ－ＳＳ的混凝效果以及ＰＦＳＳ适宜的最佳ｐＨ值范围都有影响;当Ｆｅ／ＳｉＯ２摩尔比达１．５左右时,ＰＦＳＳ的混凝除浊效果趋于最佳．     

低温环境试验条件恢复的防凝露问题

综合分析了电子产品在做完低温环境试验后,采取条件恢复方法进行恢复处理的利与弊,重点分析了采用直接快速升温对产品进行恢复处理是导致试件凝露的主要原因,通过论证试验提出了2种解决问题的方法,通过验证试验证明,这2种新的恢复方法科学合理、简单易行、效果良好。     

分析钛管冷凝除湿技术在燃煤电厂烟羽治理中的应用实例

目前消除"有色烟羽"主要采用MGGH、GGH等烟气再热技术,这些技术只是通过提高烟气扩散消除"有色烟羽"的视觉感受,但不能减少污染物和水汽的排放。本文介绍了一种钛管冷凝除湿技术在某300MW循环流化床机组"烟羽治理"中的实际应用,并对冷凝除湿过程中烟气水回收、污染物协同治理等效果进行分析,最终实现节水及污染物协同减排的目的。     

高浓度酚醛树脂生产废水的预处理

采用二次缩合反应预处理高浓度酚醛树脂生产废水。一次反应的最佳工艺条件为：甲醛加入量0.010 0 mL/mL,Ba（OH）2加入量0.005 g/mL,反应时间3 h,反应温度85 ℃。最佳工艺条件下的一次反应COD去除率为 52.9%。二次反应中,当反应温度为80 ℃、反应时间为3 h、尿素加入量为3 g/L时,二次反应COD去除率最高,为31.5%。COD=85 000 mg/L、ρ（挥发酚）= 12 000 mg/L、ρ（甲醛）=6 740 mg/L的废水经两次缩合反应处理后,出水中COD=27 400 mg/L,COD的总去除率为67.8%;ρ（挥发酚）=2 400 mg/L,挥发酚的总去除率达80.0%;ρ（甲醛）= 980 mg/L,甲醛的总去除率达84.9%。处理1 t废水还可回收酚醛树脂6.75 kg。