The selection of equipment and pipes not only has a direct impact on the production of chemical enterprises,but also has an impact on equipment maintenance and production cycles,thereby affecting the economic benefits of the chemical enterprise.Based on this,the staff of chemical enterprises need to design practical plans according to relevant regulations,and at the same time,the plans should be optimized according to the standards and actual production conditions to reduce cost input and complete chemical production on the basis of ensuring safe production.In this paper,the importance of equipment evangelism and pipe materials was expounded,and the general standards for equipment evangelism and pipe material selection were discussed.Taking a company as an example,the optimal design of equipment evangelism and the content of pipe optimization design were analyzed,in order to provide help for chemical enterprise staff.
采用乙酰溴法对浑河流域草本植物样品中木质素质量分数进行定量分析,并对反应条件进行单因素优化,在反应温度为70℃、反应时间为30 min、乙酰溴体积分数为40%的条件下,测得的浑河草本植物样品中木质素质量分数为 13.91%.乙酰溴法测定植物木质素具有易于操作、稳定性高、试样需求量少等优点.
采用化学转化法在AZ91D镁合金表面制备钼酸盐转化膜.通过Ce-Mo转化和添加剂改善.通过SEM观察发,改善后膜层表面均匀.由EDS可知,在添加剂增强后,P和Mo元素的含量较高.相比较传统转化膜而言,腐蚀电位的大小正移了约0.4 V,阻抗值达到了23 730 Ω·cm2,耐蚀性得到提高.
糠醛是一种重要的生物质基化工中间体.利用糠醛可以合成一系列下游衍生物,可用于燃料、精细化学品和药物中间体等具有高附加值的化学品生产领域.木糖选择性催化脱水是获取糠醛的代表性方法.木糖是植物半纤维素中的主要成分,以木糖催化转化合成糠醛被视为一座连接生物质原料和生物炼制工业之间的桥梁.总结了近年来关于木糖及其聚合物转化合成糠醛的研究进展,从行业规模、糠醛化学品应用、木糖转化的反应体系、催化剂以及反应机理等方面进行介绍,为生物质资源的高效利用提供参考.
