共查询到19条相似文献,搜索用时 66 毫秒
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甲醇工业面临着生产能力过剩、装置开工率下降的严峻形势,开发下游产品、培育新的消费市场是甲醇工业进一步发展的急迫任务。本文对甲醇燃料电池、甲醇制汽油、甲醇制烯烃以及醇类燃料、醋酸、甲酸甲酯、碳酸二甲酯等下游产品的技术进展作了全面综述;并介绍了一些工业化前景较好的热点下游产品的研究开发状况。 相似文献
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介绍了合成2,3,4,5-四氟苯甲酸的8条工艺路线,按采用主要原料来分,它包括:四氯苯酐法,四氟苯甲醇法,邻苯二腈法,四氟苯法,八氯萘法,N-苯基四氯邻苯二甲酰亚胺法等.对其中四氯苯酐法和N-苯基四氯邻苯二甲酰亚胺法,由于原料易得,操作条件适宜,容易工业化等原因作了重点叙述.合成步骤一般采用缩合、氟化、开环、脱羧和水解等反应合成2,3,4,5-四氟苯甲酸.2,3,4,5-四氟苯甲酸是一种重要的医药中间体,尤其是合成第3、4代喹诺酮抗菌药物的重要原料或中间体,如合成:洛美沙星、司氟沙星、氟罗沙星、氧氟沙星、左氧氟沙星和芦氟沙星等.从发展趋势看,世界抗菌药物市场正在由头孢菌素向喹诺酮药物转移,所以,开发2,3,4,5-四氟苯甲酸具有璀璨的前景. 相似文献
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醇钾、醇钠市场调研报告 总被引:1,自引:0,他引:1
1 概述 醇钾是醇类OH基团中的H原子被K原子取代后的产物,醇钠是醇类OH基团中的H原子被Na原子取代后的产物,在本报告中,醇钾、醇钠分别指甲醇钾、乙醇钾(目前工业上尚未规模生产)、叔丁醇钾和甲醇钠、乙醇钠、叔丁醇钠等产品。 甲醇钾(Potassium methylate) 分子式CH3OK,分子量70.06,有液体和固体两种类型。液体产品颜色无色或微黄,粘稠状,为甲醇钾含量约28%~32%的甲醇溶液;固体产品为淡黄色粉末,甲醇钾含量约为95%~97%。 甲醇钾主要用作缩合剂,可作为生产甲酸甲酯、碳酸二甲酯、二甲基甲酰胺的强碱性催化剂,可用于生产磺胺… 相似文献
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分述了甲酸生产的4种工艺路线甲酸钠法、甲酰胺法、丁烷(或轻油)液相氧化法和甲酸甲酯水解法;进行了世界和中国的甲酸市场分析,2008年全球甲酸产能约92万t/a,产量75万t,2008年中国甲酸产能约30万t/a,表观消费量约19.2万t. 相似文献
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CO2加H2制甲醇技术研究进展 总被引:2,自引:0,他引:2
综述了CO2加H2合成甲醇国内外最新进展,发现CO2加H2合成甲醇研究目前还主要集中在催化剂的研发方面,其中以CuZnAl为主。CO2加氢合成甲醇过程中H2的来源是一个大问题,如果通过化石资源生产氢气又副产大量的CO2,这样达不到从根本上解决CO2的目的。 相似文献
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现代物流与传统物流的基础理论研究 总被引:1,自引:0,他引:1
本文认为,物流性质划分为固有性质和非固有性质,物流非固有性质的“传统/现代”特性被定义为“传统物流/现代物流”。文章以物流时间维、物流性质维和物流特征维构建物流发展状态三维结构模型,阐述传统物流与现代物流的辩证关系,指出传统物流、现代物流、传统/现代物流相互转换这三种模式是各个国家各个时期的客观存在,它们在不同国家不同时期有不同的构成。 相似文献
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The Moderating Effect of Perceived Effectiveness of SMEs' Marketing Function on the Network Ties—Strategic Adaptiveness Relationship 下载免费PDF全文
Richard Benon‐be‐isan Nyuur Antonis Simintiras 《Journal of Small Business Management》2016,54(4):1080-1098
This study examines the critical role of perceived effectiveness of the Marketing function (MF) in small and medium‐sized enterprises (SMEs) in leveraging entrepreneurial network ties to improve strategic adaptiveness (SA). The study tests whether a MF perceived as effective by SMEs’ managers/owners moderates the relationship between SMEs network ties and SA required for improved performance. Findings of a moderated regression analysis on a sample of 263 Croatian SMEs indicate that network ties contribute significantly to their SA, and that a MF perceived as effective only moderates the impact of customer and competitor ties on SMEs’ SA. Research and practical implications are discussed. 相似文献
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Keshab Shrestha 《International Review of Finance》2021,21(1):312-323
We revisit the issue of market efficiency of Bitcoin, which is an important part of the new financial technology (FinTech), by analyzing the Bitcoin returns using two recently developed analytical techniques called bipower variation method and Multifractal Detrended Fluctuation Analysis (MF‐DFA). MF‐DFA allows us to analyze the return series in ways not possible using a monofractal analytical techniques such as detrended fluctuation analysis (DFA) and R/S method. The bipower variation method suggests that the Bitcoin returns are efficient and contain some large finite jumps. Using MF‐DFA, we find that the Bitcoin returns are multifractal and, therefore, the Bitcoin market is not efficient. By carrying out further analysis, we also find that the multifractility and inefficiency are caused by the autocorrelated returns as well as extreme returns. 相似文献
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RODOLFO M. NAYGA 《International Journal of Consumer Studies》1995,19(3):235-245
Households with children spend more on food at home than do households without children. On the other hand, compared with households without children, households with children who are at least 12 years of age are associated with higher expenditures on food away from home expenditures. Households with employed spouses are associated with lower expenditures on food at home. Other determinants of expenditures on food at home are seasonality, house ownership, region, household size, education, age and income. House ownership, region, household size, race, education and income also affect expenditures on food away from home. 相似文献