共查询到19条相似文献,搜索用时 140 毫秒
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丙烯酸合成催化剂及工艺开发进展 总被引:4,自引:1,他引:4
综述了丙烯两步氧化和丙烷氧化制丙烯酸工艺的催化剂及反应过程优化研究进展,并对两种工艺进行经济性分析.指出丙烯氧化催化剂及工艺改进的目的主要是提高选择性和生产率.由于丙烯价格的迅速上涨,丙烷法出现新的转机.若催化剂性能得以进一步提高,则来自天然气的丙烷直接氧化制丙烯酸工艺具有良好的发展前景. 相似文献
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在模拟工业生产装置上,对所开发的新型丙烯氧化制丙烯醛和丙烯醛氧化制丙烯酸催化剂的性能进行了研究,确定了催化剂的操作条件,并在该工艺条件下考察了催化剂的稳定性。结果表明:丙烯氧化制丙烯醛在空速为800~1000h^-1、盐浴温度310℃、丙烯∶空气∶水=10∶73∶17时,丙烯转化率≥98%,丙烯醛收率≥81%,丙烯醛 丙烯酸总收率≥92%,COx≤4%;丙烯醛氧化制丙烯酸在空速为1450h^-1,盐浴温度为258℃叶。丙烯醛转化率≥98%,COx≤3%。催化剂运行1000小时以上,性能良好。 相似文献
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丙烯酸是化工生产行业中主要生产原料,被广泛应用于丙烯酸各种脂类、高吸水性树脂、减水剂以及助洗剂等。而丙烯酸的生产主要是由原料丙烯经过两步氧化反应而生成的。本文简述了丙烯氧化生产丙烯醛,再由丙烯醛氧化生成目标产物丙烯酸的反应原理及反应条件。通过分析不同催化剂条件下,氧化反应中原料丙烯的消耗率与转化率、原料氧稀比、目标产物的收率与选择以及主要副产物收率等数据情况,来验证催化剂性能的优劣,并择优选择相应的催化剂,以期为相关研究提供参考。 相似文献
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Selective Oxidation of Propane to Acrylic Acid on MoVNbTe Mixed Oxides Catalysts Prepared by Hydrothermal Synthesis 总被引:4,自引:0,他引:4
MoVNbTe mixed oxides have been prepared by both hydrothermal synthesis and slurry methods and have been tested in the selective oxidation of propane to acrylic acid. For comparative purpose, ternary metal oxides have also been prepared and tested. Characterisation results (X-ray diffraction and EPR) show important differences between the catalysts prepared hydrothermally and one prepared by a slurry method. The catalysts prepared hydrothermally show a higher activity and selectivity to acrylic acid than those prepared by slurry method. A reaction network for the partial oxidation reaction is tentatively proposed from the catalytic results obtained during the oxidation of propane and propylene on these catalysts. 相似文献
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丙烯催化氧化制丙烯酸的两段流化床工艺 总被引:1,自引:0,他引:1
分别在一段和两段流化床反应器中对丙烯催化氧化制备丙烯酸过程进行了研究. 主要考察了温度、丙烯空速和氧/烯比等操作条件对丙烯氧化制备丙烯醛的第一步反应中丙烯转化率和液相收率的影响. 结果表明,在两段流化床反应器中,由于能够有效抑制气体和固体的返混及催化剂床层中气泡的增长,第一步反应中丙烯转化率和液相收率可以分别大幅度提高到94.2%和74.4%. 得到第一步反应的优化条件为:丙烯空速20~21 L/(h·kg),操作温度360~365℃,氧/烯摩尔比1.6~1.8,在此条件下,考察了连续两步反应中的丙烯转化率和液相收率. 相似文献
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丙烯酸广泛用于化工行业酯类聚合单体等原料.丙烯酸作为乙烯类单体在聚合反应中聚合速率较快,它的生产工艺方法很多,主要采用甘油等原料,生产工艺方法主要有丙烷脱氢氧化以及丙烯直接氧化两种工艺方法.本文通过对比不同的生产工艺路线,依据丙烯酸生产的现状、各主要企业的产能、装置运行情况,提出了直氧法生产丙烯酸的工艺现状以及改进,提... 相似文献
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Alkali metal-doped MoVSbO catalysts have been prepared by impregnation of a MoVSbO-mixed oxide (prepared previously by a hydrothermal synthesis) and finally activated at 500 or 600 °C in N2. The catalysts have been characterized and tested for the selective oxidation of propane and propylene. Alkali-doped catalysts improved in general the catalytic performance of MoVSbO, resulting more selective to acrylic acid and less selective to acetic acid than the corresponding alkali-free MoVSbO catalysts. However, the specific behaviour strongly depends on both the alkali metal added and/or the final activation temperature. At isoconversion conditions, catalysts activated at 600 °C present selectivity to acrylic acid higher than that achieved on those activated at 500 °C, both K-doped catalysts presenting the highest yield to acrylic acid. The changes in the number of acid sites as well as the nature of crystalline phases can explain the catalytic behaviour of alkali-doped MoVSbO catalysts. 相似文献
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介绍了丙烯酸生产技术现状,对丙烯直接氧化生产丙烯酸技术进展作了阐述。分析了国内外丙烯酸生产和市场情况,并提出了我国丙烯酸行业发展建议。 相似文献
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F. Ivars P. Botella A. Dejoz J. M. López Nieto P. Concepción M. I. Vázquez 《Topics in Catalysis》2006,38(1-3):59-67
MoVTe-Nb oxide catalysts have been prepared by a hydrothermal method and tested in the selective oxidation of propane to acrylic
acid and in the oxidative dehydrogenation of ethane to ethylene. The influence of the concentration of oxalate anions in the
hydrothermal gel has been studied for two series of catalysts, Nb-free and Nb-containing, respectively. Results show that
the development of an active and selective active orthorhombic phase (Te2M20O57, M = Mo, V, Nb) requires an oxalate/Mo molar ratio of 0.4–0.6 in the synthesis gel in both types of samples. The presence
of Nb favours a higher catalytic activity in both ethane and propane oxidation, and a better production of acrylic acid. 相似文献