共查询到12条相似文献,搜索用时 46 毫秒
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以废动植物油脂为原料,在自制DYD催化剂作用下制得脂肪酸甲酯,再以氢氧化钾为催化剂,与二乙醇胺合成烷醇酰胺。考察了反应温度、反应时间、催化剂用量、真空度等因素对反应的影响,通过单因素实验和析因实验确定最佳工艺条件为:甲酯/二乙醇胺物质的量比1∶1.55,反应温度110℃,反应时间2.5 h,真空度0.08 MPa,催化剂用量0.65%(相对于脂肪酸甲酯的质量),烷醇酰胺的收率达96.3%。通过红外光谱对产物结构进行了表征,并对界面张力进行了测定。结果表明,产物具有较好的界面活性。 相似文献
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近年来由于石油价格的上涨,严重地限制了聚氨酯工业的发展。因此用价廉易得的再生资源淀粉代替部分化工产品合成聚醚多元醇,减少对石油产品的依赖性,降低成本,对发展聚氨酯工业和给淀粉寻找新的出路,具有十分重要的现实意义和新的战略意义。 相似文献
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以转筒干燥方式考察了福建无烟粉煤与工业废碱催化剂MA同时进行混合浸渍与干燥脱水的过程,讨论了煤的粒径,干燥温度,时间、气速、转筒转速、催化剂含量和转筒处理量等因素对煤与催化剂混合浸渍与干燥过程的影响。研究表明采用转筒干燥的方式,进口干燥空气温度在80 ℃~160 ℃、转筒处理量为214 kg/m3·h~1834 kg/m3·h、干燥气速0.12 m/s~0.30 m/s、干燥时间20 min内,混合物料的湿含量可降至<5%,且催化剂与煤浸渍充分均匀,满足流化床操作的要求,实现了最佳的催化气化效果。基于实验数据拟合了煤和废碱催化剂转筒干燥的传热系数方程,通过物料与能量衡算,模拟了混合物料连续干燥时沿转筒的湿含量的变化。 相似文献
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《燃料化学学报》2021,49(2)
为了研究工业废碱液对煤水蒸气反应的催化作用,选取内蒙古王家塔煤(WJT),负载造纸黑液(BL)进行高压水蒸气气化性能评价。分别考察了温度和负载量对催化活性的影响,并与分析纯碳酸钠(SC)催化活性进行对比。固定床小试评价结果表明,700-750℃,催化剂活性随负载量增加呈先增大后减小的趋势,BL最佳负载量为3%Na,并且催化活性优于SC催化剂;温度升高,催化活性更显著。采用N_2吸附-脱附等温实验考察BL对煤焦比表面积和孔结构的影响,结果表明,随着BL负载量增加到3%,煤焦比表面积和孔容都增加,从而有利于提供更多的气化活性位点,提高煤焦反应活性;随着负载量的进一步增加,催化剂过量造成堆积堵孔,导致催化剂的比表面积和孔容降低,从而降低了气化反应速率。 相似文献
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Living Coordination Polymerization of a Six‐Five Bicyclic Lactone to Produce Completely Recyclable Polyester 下载免费PDF全文
Dr. Jian‐Bo Zhu Prof. Dr. Eugene Y.‐X. Chen 《Angewandte Chemie (International ed. in English)》2018,57(38):12558-12562
The development of chemically recyclable polymers promises a closed‐loop approach towards a circular plastic economy but still faces challenges in structure/property diversity and depolymerization selectivity. Here we report the first successful coordination ring‐opening polymerization of 4,5‐trans‐cyclohexyl‐fused γ‐butyrolactone ( M1 ) with lanthanide catalysts at room temperature, producing P( M1 ) with Mn up to 89 kg mol?1, high thermal stability, and a linear or cyclic topology. The same catalyst also catalyses selective depolymerization of P( M1 ) back to M1 exclusively at 120 °C. This coordination polymerization is also living, enabling the synthesis of well‐defined block copolymer. 相似文献
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Ijaz Hussain Abdullah Aitani Zuhair Malaibari Hassan Alasiri Muhammad Naseem Akhtar Obaid Fahad Aldosari Shakeel Ahmed 《Chemical record (New York, N.Y.)》2023,23(4):e202200294
Chemical upcycling of waste plastics into high-value-added products is one of the most effective, cost-efficient, and environmentally beneficial solutions. Many studies have been published over the past few years on the topic of recycling plastics into usable materials through a process called catalytic pyrolysis. There is a significant research gap that must be bridged in order to use catalytic pyrolysis of waste plastics to produce high-value products. This review focuses on the enhanced catalytic pyrolysis of waste plastics to produce jet fuel, diesel oil, lubricants, aromatic compounds, syngas, and other gases. Moreover, the reaction mechanism, a brief and critical comparison of different catalytic pyrolysis studies, as well as the techno-feasibility analysis of waste plastic pyrolysis and the proposed catalytic plastic pyrolysis setup for commercialization is also covered. 相似文献