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以废弃竹屑为原料,在含铬革屑(LS)、盐酸和少量苯酚微波辅助形成的液化助剂作用下,制备了一种半液化竹粉,用于竹木板材的黏合。采用单因素实验,考察液化时间、液化温度、LS用量以及液固比[m(水)∶m(竹粉)]对液化效果的影响。用FTIR、SEM与DSC表征分析了竹粉半液化前后差别。在LS用量为12%(以竹粉质量为基准,下同),液固比为5∶1,微波加热温度150℃反应15 min的条件下,竹粉的液化率可达60.95%。结果表明,LS对竹粉具有催化液化作用,且制备的液化产品作为黏合剂制备胶合板能满足GB/T 9846—2015《普通胶合板》中Ⅱ类胶合板指标。该研究为两种废弃物的资源化利用提供参考。 相似文献
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毛竹多元醇液化及液化产物的分析 总被引:1,自引:0,他引:1
以多元醇和丙三醇为液化剂,硫酸为催化剂,对毛竹粉进行了液化实验。通过单因素分析和正交实验方法研究竹粉多元醇液化工艺,从节省能源和时间的角度考虑,确定其最佳液化工艺条件为:聚乙二醇400与丙三醇质量比为80∶2 0,在液固质量比3.5∶1、硫酸质量分数3%、反应温度160℃、反应时间90 min时,液化率可达99.32%。所得毛竹粉多元醇液化产物的羟值为28~142.63 mg/g,黏度为100~840 mPa.s。并用红外光谱、GC-MS、凝胶渗透色谱分析了液化产物。 相似文献
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以竹材制浆备料废弃物为研究对象,针对竹材制浆造纸各工段产生的竹质纤维废弃物,开展竹材废料液化、分离和纯化技术研究,通过液化组分多元醇酯化,开发具有保温、阻燃等功能的新材料,以期用于建筑和装修等领域,达到相关标准的要求。主要研究内容包括:1)对竹屑进行化学成分和基本性质分析,得出竹屑中纤维素含量47.35%、半纤维素含量20.15%、木质素含量26.66%,湿基含水量7.42%,灰分4.80%,苯醇抽出物含量为1.36%。 相似文献
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以竹屑为原料,经高温炭化、微波磺化接枝等步骤制备具有酸催化功能的竹屑活性炭磺酸,通过FTIR、TG、DTA对其进行了分析,并测定了其催化性能。结果表明,在炭化温度为560℃、炭化时间为3 h、微波活化时间为30min的最佳条件下,所制得竹屑活性炭磺酸的酸量为0.847 mmol.g-1,酯化催化效果接近于Amerlyst-15磺酸树酯,稳定性好,是一种良好的新型固体酸催化剂。 相似文献
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以竹屑为原料,使用氧气-水蒸气作为混合气化剂,在固定床气化反应器中进行竹屑的氧气-水蒸气气化实验,考察了气化温度、水蒸气流量和氧气用量比对竹屑气化制备富氢燃气的影响。研究结果表明:气化温度和水蒸气流量均对竹屑燃气中氢气体积分数影响较大,氢气体积分数随着气化温度的升高呈稳步增长趋势,随水蒸气流量增加呈先增加后减少趋势,分别在气化温度900℃和水蒸气流量0.7 mL/min时达到最大值;而随着氧气用量比的增加,氢气体积分数变化不明显。竹屑氧气-水蒸气气化制备富氢燃气最佳的气化条件为气化温度900℃、水蒸气流量0.7 mL/min、氧气用量比0.30,此条件下气化制备的燃气中氢气体积分数32.04%,热值11.37 MJ/m3,产气率1.40 L/g,燃气中CH4体积分数8.82%,CO体积分数26.34%,CO2体积分数30.55%,C2Hm体积分数2.24%。 相似文献
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以竹加工废屑为原料,采用汽爆碱煮法制备了一种竹屑基吸附材料(Bamboo-basedadsorbent-BA)。通过吸附实验研究了BA对三种碱性染料废水的吸附脱色效果并探究其吸附行为及其机理。吸附和解吸实验表明,BA对染料分子的吸附是基于分子间静电引力和氢键的共同作用,脱色效果随体系pH和温度的上升而提高。热力学参数显示该吸附是一个自发、吸热和熵增过程。吸附行为可以很好地用准二级动力学方程描述,而吸附等温线用Langmuir方程拟合效果最优。BA对亚甲基蓝、结晶紫和孔雀石绿三种染料的最大吸附量分别为135.9、129.2和83.3mg/g。 相似文献
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Cation‐exchange systems were prepared by phosphorylation of some lignocellulosic materials, namely, rice straw, cotton stalks, and bagasse. The effect of the particle size of the lignocellulosic materials as well as their chemical constituents on the phosphorylation process was studied by the determination of the phosphorus content of the prepared ion‐exchange material. Phosphorus was determined using inductively coupled plasma atomic emission spectrometry. Optimization of the phosphorylation reaction was achieved by studying the effect of the different experimental parameters, namely, the reaction time, temperature, and amount of phosphorus oxychloride added, on the phosphate content of the reaction product. The treatment of the lignocellulosic material with sodium hydroxide was found to improve its phosphorylation. The cation‐exchange efficiency of the produced phosphated material toward Cd2+, Co2+, Cr3+, Cu2+, Fe3+, Ni2+, Pb2+, and Zn2+ was examined. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 792–800, 2002 相似文献
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以十二烷基苯磺酸钠(LAS)为模板剂,硝酸镍为镍源,在n(Ni)∶n(LAS)∶n(H2NCH2CH2NH2)∶n(H2O)=1.0∶1.0∶1.0∶200,反应温度80℃、反应2 h条件下,通过水热法合成了氧化镍/十二烷基苯磺酸钠复合介孔氧化物(NiOS),并利用XRD、FTIR、N2吸附脱附和Hammett等方法对材料的晶体结构和表面物性进行了表征。研究结果表明,合成的NiOS具有介孔结构特征,平均孔径为2.2 nm,比表面积为170 m2.g-1。将NiOS用于催化正辛醇乙氧基化反应,当NiOS占正辛醇质量的10%,反应温度150℃,初始反应压力0.5 MPa,环氧乙烷(EO)平均加合数为3时,EO平均反应速率为1.8 mol.h-1.mol-1,与NaOH催化体系相比,所得产品的相对分子质量分布较窄。 相似文献
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Catalytic wet air oxidation of carboxylic acids (maleic acid, oxalic acid and formic acid) was carried out in a batch reactor operated at 160 psi or atmospheric pressure. Pt/Al2O3 and the sulfonated poly(styrene-co-divinylbenzene) resin were used as catalysts. Maleic acid was proved to be a refractory substance which could not be oxidized on the Pt/Al2O3 catalyst at all atmoshperic pressure, and needed high pressure and high temperature operation for its oxidation. On the contrary, oxalic acid and formic acid were readily oxidized into carbon dioxide and water at 353 K and atmospheric pressure. The pathways of maleic acid oxidation were proposed, and the conversion of maleic acid into oxalic acid was the rate-determining step. When the sulfonated resin catalyst was present together with the Pt/Al2O3 catalyst, maleic acid could be oxidized at 353 K and atmospheric pressure. The sulfonated resin catalyst was suggested to hydrolyze maleic acid into readily oxidizable compounds. 相似文献
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Protective coatings from diethylphosphatoethyltriethoxysilane (DEPETS) have been deposited on different polymer substrates in a plasma discharge operated at atmospheric pressure. Plasma polymer chemistry and structure were characterized by means of Fourier transform infrared spectroscopy (FTIR), laser desorption ionization-mass spectrometry (LDI-MS), nuclear magnetic resonance (NMR) and scanning electron microscopy (SEM). A chemical structure of the plasma polymer has been proposed based on the coating molecular characterization. Coatings were deposited on polycarbonate (PC) and polyamide 6 (PA6) substrates. The flame retardant properties of coated substrate samples were assessed using cone calorimetry and compared to those of bare substrates. A significant increase in the time to ignition (TTI), up to +143%, was recorded after coating deposition due to the formation of a high-performance barrier layer at the surface of both polymer substrates. 相似文献
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Liquid-liquid equilibrium data for the ternary systems of toluene+water+propionic acid, o-xylene+water +propionic acid, methyl
isobutyl ketone+water+propionic acid, ethyl acetate+water+propionic acid, and 1-butanol +water+propionic acid were measured
at 25 ‡C and atmospheric pressure. The reliability of the experimental tie-line data was ascertained by means of the Othmer-Tobias,
Bachman-Brown, and Hand correlations. For the extraction effectiveness of solvents, the distribution and selectivity curves
were plotted. In addition, these experimental tie-line data were also correlated with NRTL and UNIQUAC models. 相似文献
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《Ceramics International》2020,46(2):2002-2009
This work reports a template-free wet chemical synthesis method for economical production of zinc oxide (ZnO) microrods by using an inexpensive polypropylene beaker as a reactor under atmospheric pressure. The morphology and crystal structure of the as-prepared ZnO microrods were investigated by scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and Raman scattering. Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), Ultraviolet–visible (UV/Vis) spectroscopy and methylene blue photocatalytic degradation test were also conducted to study their physical and chemical properties. The results show that the as-prepared ZnO microrods have a hexagonal crystal structure. Under the optimal synthesis condition, they have a diameter of 0.8–2.6 μm and a length of 10–40 μm. Compared with commercial ZnO powders, the as-prepared ZnO microrods have a higher whiteness. Meanwhile, the as-prepared ZnO microrods have very low photocatalytic activity, indicating that they have good photostability and are unlikely to cause the photodegradation of polymers such as binders. As a result, they will be an excellent and economical white pigment with great potential in coating applications. 相似文献