巴斯夫-壳牌新加坡合资企业装置遭遇不可抗力

巴斯夫-壳牌位于新加坡句容岛合资企业Ellba Eastern环氧丙烷--苯乙烯POSM装置已与近日停车,并且宣布其苯乙烯供应发生不可抗力。该装置年产能为55万吨苯乙烯单体和25万吨环氧丙烷。
　　壳牌发言人表示,目前公司尚未向客户发布苯乙烯单体供应不可抗力的消息,供应仍在进行,但他们会继续紧密地关注装置的后续情况。     

中化泉州PO/SM装置投产

正2021年3月25日,中化泉州石化100万t/a乙烯项目PO/SM装置首车环氧丙烷(PO)产品顺利装车出厂,发往客户厂家。环氧丙烷(PO)产品的顺利出厂,是项目建设的一个重要里程碑,也为中化集团、中化能源2021年整体效益的实现打下了坚实基础。泉州石化PO/SM装置的顺利投产,     

环氧丙烷尾气甲醇吸收及纯化工艺

针对环氧丙烷生产中环氧丙烷尾气难回收问题，提出了甲醇吸收和环氧丙烷萃取精馏解吸回收的环氧丙烷回收新工艺。该工艺同时考虑无催化环氧丙烷水解和与甲醇反应，并采用共沸精馏分离获得高附加值产品丙二醇单甲醚。选用NRTL热力学方法，对上述流程进行了全流程模拟和优化设计，分析了溶剂比、理论塔板数、吸收剂进料温度等主要工艺参数对分离的影响规律，发现新工艺对环氧丙烷质量回收率达到99.99%。研究结果对环氧丙烷工业装置产能提升、节能降耗和挥发性有机物(VOC_S)治理具有指导作用。     

降低氯醇法环氧丙烷中总醛含量的措施

介绍山东滨化东瑞化工有限责任公司环氧丙烷生产情况,改进皂化系统、脱轻系统部分工艺指标后,环氧丙烷中总醛质量分数由0．005％降至0．0015％,满足用户要求。     

电石渣应用在环氧丙烷生产中除氨的方法

着重叙述了电石渣应用在环氧丙烷生产工艺中,由于电石渣本身含有大量的氨,会使得生产出来的环氧丙烷产品含氨,会严重影响到用双金属催化剂（DMC）制得聚醚多元醇产品的质量,故要采用一些相应的办法,有效除去环氧丙烷产品中的氨的方法。     

锦化环氧丙烷聚醚产品畅销不衰

锦化环氧丙烷聚醚产品畅销不衰锦西化工总厂聚醚厂环氧丙烷系列装置自投产以来始终坚持加强质量管理，不断在产品质量下功夫，五年来，产品在市场上畅销不衰。锦化聚醚厂环氧丙烷系列装置是“七五”期间由日本旭峭子公司引进的，投产以来，全面推行质量管理，产品面向市场...     

分光光度法测定环氧丙烷中微量醛

一、前言环氧丙烷是化工基本原料,用途极广。由于聚氨酯工业需要的推动,环氧丙烷(环氧乙烷)发展相当快,需求量与日俱增,质量要求严格。其中醛类杂质的含量直接影响聚醚质量,必须严格检测。由于不同类型醛存在于不同产品里,也     

环氧丙烷产品质量的提高

对环氧丙烷生产装置皂化系统、脱轻系统及设备结构进行了技术改造。改造后,环氧丙烷产品中水质量分数由2×10-4降至0.8×10-4,含醛质量分数由4.0×10-5降至1.1×10-5,且能耗大大降低。     

氟化工专利精选

1 种制备三氟环氧丙烷的方法 1种制备三氟环氧丙烷的方法。包括向质量分数为35％的过氧乙酸水溶液中加入过渡金属催化剂：然后将三氟丙烯通人到该反应体系中,剧烈搅拌下,控制反应体系的温度低于40℃,反应2～4h后,将体系升温至50—60℃,蒸出三氟环氧丙烷。该发明制备方法的优点在于不使用剧毒或产生巨大环保压力的试剂,能够通过较为简单的方法制备三氟环氧丙烷。     

固体强碱绿色催化环氧丙烷水解合成1,2-丙二醇

该文制备了不同碱强度的固体碱催化剂,并应用于环氧丙烷(PO)水解合成1,2-丙二醇的反应。结果表明:随着催化剂碱强度的增加,环氧丙烷的转化率不断升高;说明强碱催化剂有利于环氧丙烷水解反应。在此基础上,作者系统考察了催化剂用量、反应温度、原料摩尔比和反应时间对催化性能的影响。结果表明:当催化剂CaO-ZrO2质量为反应原料质量的1.0%,反应温度为120℃,反应原料配比为:n(H2O)∶n(PO)=5∶1,反应时间2h时,其催化效果较优,环氧丙烷转化率最高为92.3%,1,2-丙二醇选择性可达89.4%。     

环氧丙烷产业现状及发展趋势

简述了全球及我国环氧丙烷产业的生产及供需现状;对环氧丙烷在聚醚多元醇、丙二醇/碳酸二甲酯、丙二醇醚及其酯类等领域的应用进行了分析;并对环氧丙烷生产技术进行了比较,提出了发展建议。     

我国环氧丙烷的生产与市场分析

评述了环氧丙烷的生产工艺,分析了国内环氧丙烷、苯乙烯及其主要衍生产品的生产、消费和贸易情况。指出我国环 氧丙烷衍生产品的发展严重滞后,主要衍生产品聚醚的品种单一,在精细化工和表面活性剂方面应用很少;第二大衍生产品丙 二醇已停产。建议我国环氧丙烷生产企业应以市场为导向有序生产,理性竞争。     

便携式气相色谱法快速测定空气中的环氧乙烷和环氧丙烷

建立一种利用便携式气相色谱仪快速测定空气中环氧乙烷和环氧丙烷的方法,两者能实现完全分离,检出限分别为0.6 mg/m^3、0.7 mg/m^3,方法的精密度与准确度较好,且检测结果与实验室常规固定式气相色谱法的检测结果差异无统计学意义（p〉0.05）。该方法经实际应用,效果良好。     

环氧丙烷合成技术及市场前景

详细论述了国内外环氧丙烷生产工艺、研究状况和生产现状，分析了市场情况及发展前景。并对我国环氧丙烷工业的发展提出了建议。     

聚氯乙烯的生产现状与市场前景

详细论述了聚氯乙烯生产工艺和生产现状，分析了市场情况及发展前景，并对我国聚氯乙烯工业的发展提出了建议。     

The role of water in propylene partial oxidation: thermal desorption studies on Ag(110)

The desorption and reactions of propylene and propylene oxide adsorbed on atomic oxygen covered and hydroxyl covered Ag(110) were investigated to elucidate the effect of water on the oxidation of propylene over silver catalysts. Previous studies clearly indicate enhancement of propylene partial oxidation by the addition of water to reactor feed streams. Propylene combustion by oxygen adatoms on Ag(110) is completely passivated by water coadsorption on the oxygen atom covered surface (water adsorption on O-Ag(110) results in hydroxyl groups). The desorption activation energy of propylene and propylene oxide is increased by up to 30% by adsorbed oxygen atoms on Ag(110). The desorption activation energy for propylene and propylene oxide is reduced on the hydroxyl covered surface relative to desorption from atomic oxygen covered Ag(110). These results suggest that the inhibition of deep oxidation plays an important role in the previously observed water enhancement. In addition, the decreased desorption activation energies for both propylene, the reactant, and propylene oxide, the desired product, may influence the selectivity of this complex reaction system. Potential changes in catalytic reactivity and selectivity caused by water addition are discussed in terms of a general catalytic reaction rate law. This revised version was published online in July 2006 with corrections to the Cover Date.     

TRANSIENT RESPONSE ANALYSIS IN THE DETERMINATION OF ADSORPTION RATE COEFFICIENTS FOR PROPYLENE AND NITRIC OXIDE ON NiO/Al203 AEROGEL CATALYSTS

Nickel oxide on alumina aerogel catalysts are known to be active and selective for the formation of acrylonitrile from nitric oxide and propylene. During an effort to investigate the mechanism of this reaction some transient feed experiments were carried out. The results obtained from these transient experiments were used to calculate the adsorption coefficients of propylene and nitric oxide on a NiO/Al₂O₃ aerogel catalysts with 1:1 Ni to Al atomic ratio. Adsorption coefficients of nitric oxide and propylene was determined by independently flowing the respective gases over the catalyst in a stream of helium at 410° C. Adsorption coefficient of nitric oxide on the catalyst at an oxidized state has been found to be less than that of propylene. When the two reactant gases flowed across the catalyst together the rate of adsorption of nitric oxide increased as the catalyst was reduced by propylene adsorption. The increased rate of adsorption of nitric oxide does not, however, influence the overall rate of formation of acrylonitrile.     

TRANSIENT RESPONSE ANALYSIS IN THE DETERMINATION OF ADSORPTION RATE COEFFICIENTS FOR PROPYLENE AND NITRIC OXIDE ON NiO/Al203 AEROGEL CATALYSTS

Nickel oxide on alumina aerogel catalysts are known to be active and selective for the formation of acrylonitrile from nitric oxide and propylene. During an effort to investigate the mechanism of this reaction some transient feed experiments were carried out. The results obtained from these transient experiments were used to calculate the adsorption coefficients of propylene and nitric oxide on a NiO/Al₂O₃ aerogel catalysts with 1:1 Ni to Al atomic ratio. Adsorption coefficients of nitric oxide and propylene was determined by independently flowing the respective gases over the catalyst in a stream of helium at 410° C. Adsorption coefficient of nitric oxide on the catalyst at an oxidized state has been found to be less than that of propylene. When the two reactant gases flowed across the catalyst together the rate of adsorption of nitric oxide increased as the catalyst was reduced by propylene adsorption. The increased rate of adsorption of nitric oxide does not, however, influence the overall rate of formation of acrylonitrile.     

锌/钴双金属氰化络合物催化环氧丙烷聚合机理

用以二乙二醇二乙醚为有机配体的锌／钴双金属氰化络合物进行了环氧丙烷的聚合，并用扩展X射线精细结构分析方法研究了催化剂激活和环氧丙烷聚合过程中锌离子和钴离子的区域结构变化。结果表明，锌／钴双金属氰化络合物催化环氧丙烷的聚合是一个活性聚合体系。在环氧丙烷聚合过程中锌离子由与3．0个氧原子配位转变为与5．7个氧原子配位，表明聚合活性中心为5．0个氧原子配位的螯合锌离子。     

用异丙苯过氧化氢作氧化剂合成环氧丙烷的新技术(续)

<正>(上接2007年第5期)3.4脱水-氢化工艺使回收PO后的反应液中的CMA先在催化剂存在下脱水转化成α-甲基苯乙烯,然后在氢化催化剂存在下,使α-甲基苯乙烯氢化为CM。