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从学术角度介绍化学工程学科的技术进展,化学工程作为一级工程学样正与相关学科结合,形成新的边缘与交叉学科,占领新的学术领域;同时还从工艺角度介绍化学工业的发展态势,化学工业作为国民经济的支柱行为,正向原料多样化,产品精细化,技术高新化的方向发展。 相似文献
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X射线光电子能谱的应用介绍 总被引:3,自引:0,他引:3
X射线光电子能谱(XPS)是较常用的表面分析技术之一,不仅能测定材料表面的组成元素,而且还能给出各元素的化学状态信息,在很多领域都有广泛用途。本文主要通过一些具体例子介绍X射线光电子能谱在表面元素的定性和定量分析方面的应用。 相似文献
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Rate expressions are presented to describe the oxidation of coal in a fixed-bed reactor under mild conditions, i.e. conditions which are useful in pretreatment for gasification. A model for chemical control is developed based upon the concept of a triple-path coupled burn-off adsorption site. The model incorporates the effects of temperature, oxygen partial pressure, and coal surface area, and is the first to account for the product distribution of gaseous C02, CO, and H2O, as well as oxygen deposited on the coal surfaces. The overall rate of oxidation is limited by the amount of reactive surface area in the coal particles and is assumed to be reduced as a result of the deposited oxygen which covers potentially reactive sites. This model differs significantly from the previously formulated model of Kam, A. Y. et al. Chem. Eng. Sci. 1976, 31, 815 which postulated external mass transfer control. 相似文献
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关于中国化肥发展之管窥 总被引:2,自引:1,他引:1
从化肥生产企业的结构层次、化肥品种研发、开拓多种钾源、化肥施用技术以及液体肥料、改性肥料、复混肥料、缓控释肥料等方面论述了如何将我国从化肥大国转变成化肥强国的构建原则、观念和措施。 相似文献
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清洁技术是推动化学工业清洁生产的关键 总被引:5,自引:0,他引:5
清洁生产是实现经济环境协调发展的战略。本文从化工原料、化学反应、反应介质和化工产品等几个方面,介绍了实现清洁生产的途径,指出清洁技术或绿色工艺是促进化工清洁生产的关键,也是化学工业今后的发展方向。 相似文献
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阐述了社会主义市场经济体制下,随着科学技术的高速发展,加强情报信息化是推动化工企业发展的前提和条件。 相似文献
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化工过程强化是实现可持续发展的重点项目之一,本文分别介绍了化工过程强化的技术,包括膜技术、非传统过程、脉动燃烧干燥技术、连续床色谱技术、整体催化技术和信息技术;化工过程强化的设备,主要有超重力旋转填料床、多功能反应器、静态混合反应器、微反应器和膜反应器等;以及化工过程强化目前存在的一些问题。 相似文献
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阐述了化学工程学科的研究特点,论述了国内外化学工程技术研究的发展现状,指出了新世纪的化学工程发展趋势及对策。 相似文献
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General strategies for solving the problem of computing the equilibrium composition of a multiphase, multispecies, chemically reacting system are discussed. An efficient new algorithm is presented based on these strategies, together with a microcomputer-based implementation. Numerical examples show the algorithm's utility, and its advantages over other recently proposed methods in terns of a number of criteria, including speed and certainty of convergence. The range of problem types within the capability of the new algorithm, and its limitations are discussed. 相似文献
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The reductive alkylation of Illinois No. 6 coal has been investigated to determine the experimental conditions that are most suitable for the conversion of the coal to an alkylated product that is soluble in tetrahydrofuran. Thermodynamic and kinetic factors influence the reactivity of the reducing agent; potassium is the most effective alkali metal. The reduction potentials of the aromatic hydrocarbons used as electron transfer agents dictate the effectiveness of these reagents; biphenyl and naphthalene are more suitable reagents than anthracene. The alkylation reaction is a kinetically controlled SN2 process and reactive reagents such as primary alkyl iodides and sulphonates are necessary for complete alkylation reactions. Under the most suitable conditions, potassium, naphthalene, and straight-chain butyl iodide allow the conversion of almost 90 wt% of Illinois No. 6 coal to products that are soluble in tetrahydrofuran. 相似文献