共查询到18条相似文献,搜索用时 62 毫秒
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甲醛生产所用催化剂经历了铂催化剂、铜催化剂、浮石银、银网、电解银、铁钼氧化物催化剂的变迁,从不断提高设备生产能力,降低物料消耗,减少环境污染起了积极的推动作用。通过对催化剂性能和制作工艺的比较,简述了我国甲醛工业工艺技术的进展和新技术的前景。 相似文献
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介绍浮石银法生产甲醛的一些经验。在系统开停车过程中,氧醇比可调节为0.24,利于开车也防止超温事故的发生。减少三元过滤器玻璃丝棉的量,系统阻力可从10 ̄16kPa下降至6.7 ̄8kPa,生产能力可提高2%。适当提高浮石银催化剂中银含量,吨甲醛醇耗可下降10kg。另外,催化剂的质量及原料甲醇的质量都将影响产品甲醛的质量,并提出了催化剂被烧的原因及补救措施。 相似文献
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以焦化厂生产的混合二甲苯为原料,研究了在一甲-甲醛树脂时,不同催化剂对树脂 平均分子量等性能的影响情况,提出了合成不同的用途树脂的工艺路线。 相似文献
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当今,生产甲醛方法中都是采用甲醇气相氧化脱氢法,有两种基本的催化工艺方法,银催化剂工艺和铁钼氧化物催化剂工艺,统称“银法”和“铁钼法”。 相似文献
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介绍电解银催化剂的装填、开车情况, 结合实际试生产测定数据, 确定了适宜的工艺条件(反应温度、水醇比、氧醇比、空速等) 以及非正常情况的处理办法 相似文献
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M. Bowker R. Holroyd A. Elliott P. Morrall A. Alouche C. Entwistle A. Toerncrona 《Catalysis Letters》2002,83(3-4):165-176
The reaction of methanol with an industrial iron molybdate catalyst, and with Fe2O3 and with MoO3, has been investigated with a pulsed flow reactor and temperature-programmed desorption (TPD). The molybdena-based samples show only formaldehyde in TPD as the carbon-containing product, arising from the decomposition of a surface methoxy species. In contrast, haematite yields no formaldehyde, only CO2 and H2, which evolve coincidently at 290 °C, and indicates the presence of a formate intermediate on the surface. In turn, the reactor work shows high selectivity to formaldehyde for the molybdate materials and zero for haematite. The iron molybdate sample is more active than the molybdena, conversion beginning at 150 °C for the former and 270 °C for the latter. These data are discussed in terms of a global mechanism for the reaction and a tentative reaction enthalpy profile is proposed. The main differences between the iron and molybdenum samples arise from the stronger binding of oxygen in the former and the higher concentration of cation sites. 相似文献
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Tae Hwan Kim B. Ramachandra Jung Sik Choi M. B. Saidutta Ko Yeon Choo Sun-Dal Song Young-Woo Rhee 《Catalysis Letters》2004,98(2-3):161-165
Methanol selective oxidation to formaldehyde over a modified Fe-Mo catalyst with two different stoichiometric (Mo/Fe atomic ratio = 1.5 and 3.0) was studied experimentally in a fixed bed reactor over a wide range of reaction conditions. The physicochemical characterization of the prepared catalysts provides evidence that Fe2(MoO4)3 is in fact the active phase of the catalyst. The experimental results of conversion of methanol and selectivity towards formaldehyde for various residence times were studied. The results showed that as the residence time increases the yield of formaldehyde decreases. Selectivity of formaldehyde decreases with increase in residence time. This result is attributable to subsequent oxidation of formaldehyde to carbon monoxide due to longer residence time. 相似文献
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催化剂在石油化工产业生产中起着至关重要的作用。本文阐述了几个重要石油化工产业催化剂的使用现状和研究前景,包括石油催化裂化催化剂、石油加氢催化剂、环氧乙烷催化剂和丙烯腈催化剂。新型绿色的合成路线有助于降低能耗,提高产品产率。这两方面的发展将推动石油化学产业发展。 相似文献
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