共查询到19条相似文献,搜索用时 46 毫秒
1.
本文主要结合我公司生产实际,从H2O2用量、碱量及pH值控制,漂白时间与温度等方面,对H2O2漂马尾松磨木浆工艺进行了一系列探讨,总结。以期从生产上、经济上选择合适的H2O2漂白工艺参数。 相似文献
2.
添加助剂的过氧化氢漂白 总被引:2,自引:0,他引:2
麦草NaOHO2/NaOH两段蒸煮纸浆具有良好的可漂性,采用简单的酸处理H2O2漂白(AP)程序,仅用15%的H2O2可使漂白浆的白度达到74%~753%(ISO)。为了进一步提高麦草NaOHO2/NaOH两段蒸煮纸浆无氯漂白的效果,又进行了添加助剂的H2O2漂白试验。1试验部分漂白用浆为麦草NaOH预处理O2/NaOH蒸煮的氧碱浆,其白度为594%(ISO),卡伯值109,粘度827ml/g。漂白采用酸处理H2O2漂白(AP)程序,浆样先用H2SO4进行预处理,再进行H2O2漂白。酸处理在烧杯中进行,H2… 相似文献
3.
机械浆的高白度漂白试验李井宏,陈霞,刘海江吉林纸业股份有限公司132002关键词机械浆,H_2O_2,漂白,高白度,杨木为了利用机械磨木浆(GP)生产高白度纸,我们对杨木机械磨木浆进行了高白度漂白的研究。1试验方法1.1浆料打浆度70°SR,原浆白度5... 相似文献
4.
进行了硫酸盐法荻苇浆过氧化氢强化的氧脱木素漂白试验,对氧脱木素浆的高温压力过氧化氢漂白工艺进行了初步研究,并进行了常规过氧化氢补充漂白试验。结果表明:在氧脱木素时加入少量的H2O2能有效地提高氧漂的脱木素能力,提高纸浆的白度增值;氧漂浆经过压力过氧化氢漂白及常规过氧化氢补充漂白后,白度可达到80%以上,强度良好,说明OpPpP是适合硫酸盐法荻苇的短序,全无氯漂白流程。 相似文献
5.
本文研究了SSAQ麦草浆OP两段漂白的工艺。结果指出,适当酸处理后,氧漂过程中中添加氨磺酸(SFA),适当提高氧漂压力(1.0MPa),延长漂白时间(70分钟),可使未漂浆硬度(KMnO4值)降低率达50%左右;白度从51.75%升高至70.9%(SBD);粘度降低率为16.6%,氧漂浆粘度为1020cm/g。系统的H2O2漂白表明,氧漂浆在H2O2漂前采用H2SO4预处理具有很好的效果,H2O2 相似文献
6.
彩印废纸的脱墨与漂白研究 总被引:1,自引:0,他引:1
本文对重彩印刷的杂志废纸进行了脱墨与漂白的试验室研究。结果表明:经重彩印刷的杂志废纸使用NaOH,添加适量H2O2等化学药品进行脱墨处理,可以得到74.3%白度的浆料。再经PY漂程漂白后,白度可达83.7%,可制造中、高档纸张及纸板。其物理性能除耐破度外,可达到或超过B类漂白硫酸盐阔叶木浆的国家标准。 相似文献
7.
8.
本文研究了SSAQ麦草浆OP两段漂白的工艺。结果指出,适当酸处理后,氧漂过程中添加氨磺酸(SFA),适当提高氧漂压力(1.0MPa),延长漂白时间(70分钟),可使未漂浆硬度(KMnO4值)降低率达50%左右;白度从51.75%升高至70.9%(SBD),粘度降低率为16.6%,氧漂浆粘度为1020cm3/g。系统的H2O2漂白表明,氧漂浆在H2O2漂前采用H2SO4预处理具有很好的效果,H2O2消耗1.37%时,漂浆白度可以从70.9%提高到82.9%(SBD),漂浆打浆度为41°SR,裂断长为5.06km。 相似文献
9.
本研究属华南理工大学制浆造纸国家重点实验室资金资助项目。原料为兰桉(E.Globulus) ,采自云南省陆良县。钼酸盐、KMnO4 和杂菲L活化的H2O2 漂白实验中使用的浆料是桉木硫酸盐氧脱木素纸浆 ,浆料性质为 :卡伯值12.2 ,粘度1068ml/ g,ISO白度49.50 % ;助剂N和酰胺改善的H2O2漂白实验中使用的浆料是桉木硫酸盐未漂浆 ,浆料性质为 :卡伯值17.9 ,粘度1230ml/g,ISO白度34.77 %。通过实验得出 :(1)钼酸盐对酸性H2O2 漂白具有催化效应 ,添加少量的钼酸盐即能有效地提高… 相似文献
10.
11.
12.
分光光度-低压离子色谱法测定Cu2+、Ni2+、Zn2+、Pb2+、Fe2+和Mn2+ 总被引:1,自引:1,他引:0
建立了分光光度-低压离子色谱法测定Cu2+、Ni2+、Zn2+、Pb2+、Fe2+和Mn2+6种重金属离子的分析方法.选用柠檬酸-草酸混合液作为洗脱体系进行梯度洗脱,将6种金属离子完全分离,柱后采用1-(2-吡啶偶氮)-2-萘酚(PAN)进行衍生反应,于波长560 nm处进行检测.6种离子的检出限分别为0.006、0.012、0.005、0.125、0.070、0.020 mg/L.该方法用于环境水样测定,结果与原子吸收法所测值基本吻合,分析结果令人满意. 相似文献
13.
14.
15.
16.
氯化钙用于高得率浆H2O2漂前预处理 总被引:2,自引:1,他引:2
研究了CaCl2用于高得率桦木浆H2O2漂前预处理的效果,并与DTPA、EDTA、H2SO4等预处理剂的预处理效果进行了比较。结果表明,CaCl,是一种优良的预处理剂。CaCl2预处理的适宜条件为:用量0.5%,pH值7,温度40℃,时间25min。 相似文献
17.
Yu-Jing Zhu Han-Tao Zhou Yong-Hua Hu Jian-Yang Tang Ming-Xing Su Yun-Ji Guo Qing-Xi Chen Bo Liu 《Food chemistry》2011
The inhibition kinetics of 2-phenylethanol, 2-phenylacetaldehyde and 2-phenylacetic acid on the enzyme activity of mushroom tyrosinase have been investigated. The results showed that these aromatic compounds can lead to reversible inhibition of the enzyme; furthermore, 2-phenylacetaldehyde and 2-phenylacetic acid are uncompetitive inhibitors and 2-phenylethanol is a mixed-type inhibitor. The inhibition constants have been determined and the inhibiting ability was: 2-phenylacetaldehyde > 2-phenylacetic acid > 2-phenylethanol, indicating that the functional group on the benzene ring group played an important role in the inhibition of the enzyme. In addition, 2-phenylacetic acid and 2-phenylethanol were found to have effective antibacterial activities, and 2-phenylacetic acid was more effective against Escherichia coli and Ralstonia solanacearum than 2-phenylethanol, but 2-phenylacetaldehyde lacked of antibacterial activity. 相似文献
18.
Cerrato JM Barrows CJ Blue LY Lezama-Pacheco JS Bargar JR Giammar DE 《Environmental science & technology》2012,46(5):2731-2737
The dissolution of UO(2) in a continuously stirred tank reactor (CSTR) in the presence of Ca(2+) and Zn(2+) was investigated under experimental conditions relevant to contaminated groundwater systems. Complementary experiments were performed to investigate the effect of adsorption and precipitation reactions on UO(2) dissolution. The experiments were performed under anoxic and oxic conditions. Zn(2+) had a much greater inhibitory effect on UO(2) dissolution than did Ca(2+). This inhibition was most substantial under oxic conditions, where the experimental rate of UO(2) dissolution was 7 times lower in the presence of Ca(2+) and 1450 times lower in the presence of Zn(2+) than in water free of divalent cations. EXAFS and solution chemistry analyses of UO(2) solids recovered from a Ca experiment suggest that a Ca-U(VI) phase precipitated. The Zn carbonate hydrozincite [Zn(5)(CO(3))(2)(OH)(6)] or a structurally similar phase precipitated on the UO(2) solids recovered from experiments performed in the presence of Zn. These precipitated Ca and Zn phases can coat the UO(2) surface, inhibiting the oxidative dissolution of UO(2). Interactions with divalent groundwater cations have implications for the longevity of UO(2) and the mobilization of U(VI) from these solids in remediated subsurface environments, waste disposal sites, and natural uranium ores. 相似文献