共查询到20条相似文献,搜索用时 62 毫秒
1.
《现代化工》2017,(2)
利用纳米氧化铜催化剂、过氧化氢绿色氧化剂对奇台风化煤进行水热法催化氧化制备黄腐植酸。通过正交实验对催化氧化工艺进行优化,并利用XRD、TEM、SEM研究了所制备的纳米氧化铜的微观结构及形貌,对黄腐植酸进行了结构表征,同时初步研究了催化氧化反应动力学。正交优化结果表明,在过氧化氢催化氧化工艺的最佳反应条件下,总腐植酸质量分数可达73.23%,其中黄腐酸质量分数为8.98%。工艺研究表明纳米氧化铜催化剂与过氧化氢氧化剂协同作用显著提高腐植酸的产率。反应动力学初步分析表明,过氧化氢催化氧化制备腐植酸的反应对风化煤的浓度的反应级数是3。微观结构分析表明纳米氧化铜催化剂结晶性较好,同时具有良好的分散性;FT-IR分析可知,奇台风化煤经过该工艺成功制备了黄腐酸,与工艺研究结论吻合。 相似文献
2.
3.
4.
水体水——土壤水、植物水是农业用水不可分割的两个部分,也是认识农业用水意义上“源”和“流”的出发点。以植物水为主要对象的生物节水,正是建立在传统的旱作农业的基础上,是对旱作农业技术的丰富和补充。 利用风化煤资源,提取活性物质成分黄腐酸(FA)作为植物抗蒸腾节水制剂,是目前国际旱作农业的新课题。长治市地处沁水煤田,风化煤资源丰富,黄腐酸含量上乘,不仅可生产抗干旱的植物节水制剂,而且其副产品(残料)还可制成土壤肥力改良制剂。这不但能为生物节水提供资源,也为改善旱作农业区域土壤肥力创造新的物质投入。 可以说,建设以风化煤为主要资源的生物节水工程,是长治地区旱作农业以水保产,以肥促产的技术进步工程。 相似文献
5.
6.
用相同的方法从风化煤,草炭,生化黄腐酸发酵料中提取黄腐酸,性质,性能测试结果是:生化黄腐酸分子量小,含氧功能团多,抗絮凝作用强,与微量营养元素铬(螯)合能力强,进入植物细胞快,在农业上效果明显,风化煤黄腐酸相对分子量大,含氧功能团少,抗絮凝作用低,草炭黄腐酸性质,性能在两者之间又更靠近生化黄腐酸。 相似文献
7.
黄腐酸对小麦的生理作用及在节水栽培上的应用 总被引:6,自引:2,他引:6
通过多年试验,研究黄腐酸对小麦的生理作用及在节水栽培上的应用。试验证明,冬小麦叶面喷施,可以缩小叶片气孔开张度、抑制叶片蒸腾、提高叶片保水能力,维持较高土壤水含量,使植株在水分逆境条件下保持较高水势,增强根系活力,保持上部叶片较长的功能期和较高的光合能力,为籽粒灌溉打下基础。研究证明FA的生理活性有效期可达20天左右,突破了以往认为只有12天的观点。不同品种对FA叶面喷施的反应存在一定差异,以后期 相似文献
8.
测定了不同温度、起始浓度、pH值条件下黄腐酸在风化煤残渣上的吸附量。结果表明:风化煤残渣对黄腐酸具有超乎寻常的吸附能力,在常温和10~20g/L的平衡浓度下,吸附量可达300mg/g,在pH值为1的酸性条件下,吸附量甚至可达400mg/g。该结果对于生产工艺乃至含量分析测定具有重要的参考意义。 相似文献
9.
10.
11.
12.
13.
乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
14.
The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献
16.
以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。 相似文献
17.
18.
The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
19.
我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
20.
Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献