催化裂化装置汽油烯烃含量增大的原因分析及对策措施

为解决中国石油宁夏石化公司260万t/a催化裂化(FCC)装置汽油烯烃含量偏高的问题,对装置生产操作条件和催化剂进行了调整。结果表明:通过采用提高剂油质量比,增加油气分压,增大催化剂加入量等措施后,FCC汽油烯烃体积分数降低至35%以下,辛烷值保持在90.0以上,满足了国Ⅵ汽油的要求。     

Two-stage thermocatalytic upgrading of fuel oil to olefins and fuels over a nanoporous hierarchical acidic catalyst

A two-stage thermocatalytic upgrading process using a novel catalyst was investigated to produce light olefins and liquid fuels from fuel oil. The upgraded oil from the first thermal stage demonstrated lower viscosity and higher crackability compared to the virgin feedstock. In the next step, the vapor-phase catalytic cracking of the upgraded fraction was implemented over a novel nanoporous composite catalyst, characterized by the XRD, FTIR, NH₃- TPD, and N₂ physisorption techniques. In total, more than 55?wt% of light olefins, particularly propylene (25.5?wt%) together with 25.4?wt% and 32.5?wt% of gasoline and diesel fuel were obtained in this process.     

车辆生产中军转民有关问题探讨

本文指出了从军用车辆生产转向民用车辆生产是一个技术与经济的过程；论述了尽快完成这一过程所必须解决的技术创新问题，生产方式问题和投资多元化问题．     

基于色键抠像技术的电视跟踪系统仿真方法研究

在仿真训练中，某型武器的电视跟踪系统的仿真采用了色键抠像技术来实现。色键抠像技术是电视节目制作领域产生节目画面的一种较为成熟的技巧，它通过高低电平的变换将两幅画面合二为一。通过分析装备的实际特点，使用色键抠像技术将电视跟踪系统的摄像机拍摄采集到的真实场景与计算机生成的虚拟空袭目标相融合，并最终在电视跟踪系统的监视器上显示，从而为反空袭一方的作战训练提供“看得见”的靶标，使训练更加贴近真实。     

瀑布沟心墙砾质防渗料防渗与抗渗性能研究

瀑布沟水电站大坝在国内首次将砾质土用作高土石坝心墙防渗料，为充分了解砾质土的防渗、抗渗性能，在填筑标准确定之后，系统地研究了组、细骨料含量、填筑状态和渗透比降对土料防渗能力的影响，并对土料下游加反滤后抗渗能力的变化及淤塞情况进行了研究，全面评价了土料的适用性，为工程渗流控制设计提供了依据。     

Rate of adsorption to and desorption from a langmuir surface: The case of zero activation barrier to adsorption without dissociation

Many rate constants of elementary steps on single crystals have been measured. Their pre-exponential factors can now be compared to those calculated by transition state theory. Such a calculation is presented in this Letter with due attention to microscopic reversibility, standard states, and configurational entropy.     

Theory of Drying

This review examines the stages of drying, with the emphasis on the constant rate period (CRP), when the pores are full of liquid. It is during the CRP that most of the shrinkage occurs and the drying stresses rise to a maximum. We examine the forces that produce shrinkage and the mechanisms responsible for transport of liquid. By analyzing the interplay of fluid flow and shrinkage of the solid network, it is possible to calculate the pressure distribution in the liquid in the pores. The tension in the liquid is found to be greatest near the drying surface, resulting in greater compressive stresses on the network in that region. This produces differential shrinkage of the solid, which is the cause of cracking during drying. The probability of fracture is related to the size of the body, the rate of evaporation, and the strength of the network. A variety of strategies for avoiding fracture during drying are discussed.     

Synthese du furyl-2 oxiranne en milieu hétérogène solide-liquide faiblement hydrate: Determination du régime de production,expression de la loi cinétique

Optimum conditions for scaling up the synthesis of furyl-2 oxyrane from furfural have been determined. A continuous stirred tank reactor proved the most efficient configuration for the production of the oxirane. The kinetic model makes it possible to predict the yields of epoxide per unit volume and unit time.     

含豆渣食品的研究

豆渣含有丰富的食物纤维，本试验将豆渣经过脱腥细化处理，制成湿豆渣糊和干豆渣粉，制成含豆渣的桃酥、面条、猪肉丸子。证明添加一定量的豆渣不会影响这些产品的感官质量，并可提高食品中食物纤维的含量。