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以废树脂为原料,通过改进氧化工艺,采用环保型氧化剂双氧水直接氧化制备苯并噻唑,附加值高,变废为宝,改善生态环境。以苯并噻唑收率为考察指标,探讨了投料比(甲苯/树脂)、氧化剂比例(双氧水/树脂)、反应时间、反应温度等因素对氧化反应的影响。最佳工艺实验条件:投料比(甲苯/树脂)2倍、氧化剂比例(双氧水/树脂)1.22倍、反应时间8 h、反应温度60℃。此工艺不经过氢氧化钠溶解过滤步骤直接用双氧水氧化,直接用甲苯溶解原料,省去甲苯萃取步骤,简化工艺流程,节约大量成本,同时废水含盐量大大降低,后续处理较容易。可为生产促进剂M产生的废树脂资源化利用提供一条新工艺方法。 相似文献
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间-苯氧基苯甲醛是合成拟除虫菊酯的主要中间体。一般合成方法多是采用由间-苯氧基甲苯经氯化(或转为季铵盐)再水解及直接氧化法等。为了减少对环境的污染和缩短反应步骤,我们采用钻盐为催化剂在常压下于液相使间-苯氧基甲苯直接氧化合成了间-苯氧基苯甲醛,产率21~30%,沸点170~174℃/3毫米汞柱。 相似文献
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V. K. Marinich O. V. Firsova G. A. Gendel'man G. G. Evseeva S. M. Naigauz 《Fibre Chemistry》1970,1(4):459-461
Conclusions 1. The composition of water obtained after removing lubricant by the aluminate method and further softening scarcely differs at all from that of softened water and can be re-used in industry.2. The flowsheet described enables a closed purification cycle to be built and finishing waste waters to be used; it enables the water consumption for fibre washing to be reduced, the discharge of toxic caprolactam to reservoirs to be discontinued and caprolactam to be recycled.Kiev Combine. Translated from Khimicheskie Volokna, No. 4, pp. 76–78, July–August, 1969. 相似文献
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《Ceramics International》2021,47(23):33010-33019
The availability of natural calcium derived from biowaste materials is an inexpensive alternative to commercial calcium reagents used to produce calcium phosphate bioceramics. This approach is more ecofriendly, cost effective and sustainable owing to its abundant availability. In this study, zinc-substituted hydroxyapatite (ZnHA-Es) was synthesised using calcium precursor derived from eggshells through precipitation method. Zn concentration was varied from 1 mol% to 5 mol% during the synthesis, and the derived powders were calcined at 700 °C in air atmosphere. XRD analysis revealed that ZnHA-Es powders were highly crystalline and comprised biphasic mixtures of HA as the major phase and β-tricalcium phosphate as the minor phase. FTIR examination indicated that all ZnHA-Es samples had a similar structure to pure HA as evidenced by the presence of frequency bands corresponding to phosphate, carbonate and hydroxyl functional groups. The disappearance of vibrational bands of carbonate groups became more apparent with increased Zn concentration. Microstructure analysis revealed that the derived nanostructured particles were spherical (approximately 40–100 nm in diameter) regardless of Zn substitution. 相似文献
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从苯塔残液中提取联苯的研究 总被引:3,自引:1,他引:3
利用精馏和溶剂重结晶相结合的方法,从苯加氢装置的苯塔残液中提取联苯,精馏后可获得95%以上的联苯窄馏分,进一步重结晶后可获得99.5%以上联苯。 相似文献
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据中国质检局公布的名单 ,西安开米公司生产的液洗产品将在今后3年里得到免检资格。公司主席于文女士表示 ,开米将投资120万美元改进其质检中心西安开米获得“免检资格”@王吉星 相似文献