共查询到19条相似文献,搜索用时 125 毫秒
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催化装置于2010年底开始试用吉化集团油脂化工有限公司生产的JHY-10FCC增产丙烯助剂,在试用过程中,通过对加入丙烯助剂前后原料性质、催化剂活性、操作条件、产品收率及丙烯含量的比较,说明在该剂作用下,部分轻油转化为液化气,从而增加丙烯产率。 相似文献
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丙烯聚合Ziegler-Natta催化剂中内给电子体的研究进展 总被引:1,自引:0,他引:1
对丙烯聚合Ziegler—Natta催化体系中内给电子体的研究进展进行了综述,对现有的内给电子体进行简单分类,同时分析了单酯类、二酯类、二酮类和二醚类化合物作为内给电子体对催化剂的活性和丙烯聚合物等规度的影响,对丙烯聚合Ziegler—Natta催化体系中内给电子体的进一步研制和开发提出了看法。 相似文献
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近年来,丙烯的需求增长率高于乙烯,预计中远期全世界范围内将出现丙烯供应短缺,在这种情况下,人们更加关注除乙烯裂解或FCC副产丙烯以外的丙烯制备新技术.本文着重介绍可以进行规模生产的商业化的各种丙烯制备技术. 相似文献
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介绍了小麦固氮菌剂的菌种特性、菌剂生产、菌剂标准、增产机理、应用技术和大面积应用的增产效果,论述了联合固氮菌在 农业微生物制剂中的地位和建立生态农业中的作用,展望了其开发应用前景。 相似文献
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聚丙烯催化剂及生产工艺新进展 总被引:1,自引:0,他引:1
综述了近年来用于丙烯聚合的Ziegler-Natta催化剂、茂金属催化剂和非茂单活性中心催化剂的最新研究进展.对Basell公司的Sphenzone工艺和Borealis公司的Borstar工艺等新开发的创新工艺进行了详细的介绍.指出我国在PP催化剂研发方面与国外相比还存在较大差距,特别是希望对茂和非茂等处于技术前沿的催化剂的开发应给予足够的重视.积极跟踪世界PP生产新工艺和新型催化剂的发展方向,加大符合国情的PP生产新工艺和新型催化剂的研究开发力度,以促进PP工业的快速发展. 相似文献
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随着聚丙烯等下游产品需求的快速增长,以及以乙烷为原料的新建乙烯生产装置比例的增加,丙烯资源供应逐渐呈现出紧张态势。相应地,以丙烯为目的产物的生产技术研究越来越活跃,丙烯生产技术已成为当前炼油和化工重点研究方向之一。 相似文献
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Jang C. Jin 《The World Economy》2004,27(10):1571-1582
The effect of increasing openness on real output growth in China is examined. The framework of analysis is a regression model that uses time‐series data for each province. For east coastal provinces, increasing openness is found to have positive effects on real output growth, and some of the effects are statistically significant. The results appear to be broadly consistent with the new growth theories that openness enhances long‐run growth through its impact on technological improvement. However, inland provinces in China have been isolated from world trade for several decades and their economies devastated. An increased openness in these provinces is found to have, in most cases, negative effects on real output growth. 相似文献
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Anthony J Makin 《Business Economics》2009,44(2):80-86
This paper examines how China's heavily managed exchange rate contributes to its huge trade surplus with its major trading partners, most notably the United States. Based on the distinction between economies’ aggregate output and expenditure and on the premise that exchange rates are shared variables, it develops a straightforward framework that shows how exchange rate management by China's central bank affects China's fast growing output, expenditure, employment, and trade balance, while simultaneously influencing these aggregates in its slower growing industrialized trading partners. This framework reveals that under conditions of limited private capital mobility an inflexible yuan yields higher short-run output gains for China at trading partners’ expense through a form of “exchange rate protection.” At the same time exchange rate misalignment limits China's consumption and hence living standards. A misaligned currency is also shown to bias international saving and investment flows and is central to any explanation of global imbalances. 相似文献
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水果业是茂名市农村经济的支柱产业,但是,近几年随着种植面积的扩大和水果产量的增加,产值反而在逐年递减,其主要原因是缺少现代农业的科学规范的种植和管理,为此从建设农业现代化的角度,提出了构建农业产业化的经营模型和具体操作办法,这对推动茂名水果业的持续发展和社会主义新农村建设有着一定的指导价值。 相似文献
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指出了氯醇法和共氧化法的发展趋势,概述了丙烯催化环氧化合成环氧丙烷技术的研究进展,包括以分子氧、H2O2、原位合成H2O2和有机过氧化物为氧化剂的催化氧化法。同时对各种催化反应工艺、催化剂和催化反应机理进行了讨论,并对PO清洁生产技术的前景进行了展望。 相似文献
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李蓉 《中国对外贸易(英文版)》2011,(2)
EXECUTIVE SUMMARY
This reportaimsto analyze competitiveness Ofintemet industy in Australia Using five forces model.Competition is more intensive between Telstra andOptuswhich have a remarked position in the market. 相似文献
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This paper studies the trends in foreign direct investment (FDI) flows into selected South‐East Asian and East Asian economies after the Asian crisis. Empirical evidence indicates that South‐East and East Asian economies are recovering from the Asian crisis with strong output growth driven largely by export growth. However, output growth in the post‐crisis period is also accompanied by rising unemployment rates, growing government deficits, and declining FDI inflows into the South‐East Asian region. The declining FDI inflows into South‐East Asia after the crisis is of concern, as our empirical results show that FDI is important for output growth in the region. Our results also suggest that there might have been structural changes in the regional economies that could have led to a downward shift in the output growth of Asian economies in the post‐crisis period. This raises the issue of the sustainability of their output growth in the post‐crisis period. 相似文献
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近年来,在商业投资的推动下低轨卫星通信星座网络快速发展,不断有新的商业低轨卫星通信星座计划涌现。实际上20世纪90年代也曾掀起过低轨通信卫星星座浪潮,但结果却未能达到最初的设想。总结了20世纪90年代提出的低轨通信卫星计划的经验教训,概述了目前典型的新兴低轨商业卫星通信星座特性及发展现状,根据之前星座的经验教训提出了对当前商业低轨卫星通信星座发展的思考。 相似文献