醋酸乙烯生产技术的研究进展

文章简要回顾了醋酸乙烯的生产技术,从新原料路线、催化剂新技术方面介绍了近年醋酸乙烯合成的技术研究现状和特点,同时展望了醋酸乙烯合成技术的发展方向.     

生产醋酸乙烯的方法

<正>产品和技术简介:本发明涉及生产醋酸乙烯的方法,特别地涉及一种能耗得到降低的生产醋酸乙烯的方法。本发明提供一种乙烯气相氧化生产醋酸乙烯的方法,在醋酸乙烯合成过程中,乙烯、氧气和醋酸在醋酸乙烯合成反应器中在催化剂的存在下转变为醋酸乙烯,其特征在于从该醋酸乙烯合成反应器取出的反应后的     

乙烯法醋酸乙烯生产技术研究进展

介绍了乙烯法生产醋酸乙烯的技术现状。概述了国内外乙烯法合成醋酸乙烯的技术进展。指出了其今后的发展方向。     

国内外乙烯法合成醋酸乙烯技术研究进展

乙烯法由于工艺性、经济性好而成为目前世界上合成醋酸乙烯的主要方法。从催化剂和生产工艺等方面概述了国内外乙烯法合成醋酸乙烯的技术进展,指出了其今后的发展方向。     

乙炔法合成醋酸乙烯技术研究进展

介绍了乙炔法生产醋酸乙烯的技术现状。从催化剂、生产工艺、后处理技术以及设备装置开发等方面概述了我国乙炔法合成醋酸乙烯的技术进展。指出了其今后的发展方向。     

醋酸下游产品综合开发技术方案探讨

以煤基甲醇羰基合成醋酸过程为基础,设计了一种醋酸乙烯及其衍生物的综合开发方案。对方案中所涉及的醋酸乙烯、聚醋酸乙烯、聚乙烯醇和醋酸乙烯-乙烯共聚物4个主要醋酸下游产品的生产工艺现状进行总结,并结合资源分布及产业政策的实际情况,分析和比较了每种产品不同的工业化生产路线,为相关醋酸乙烯及其衍生物开发项目的方案设计和技术路线的确定提供参考。     

醋酸甲酯羰基化合成醋酸乙烯研究进展

以醋酸甲酯为原料,经羰基化合成亚乙基二乙酸酯中间产物、再裂解生成醋酸乙烯的技术方法是一种新型煤化工合成醋酸乙烯工艺路线。综述了国内外醋酸甲酯制备醋酸乙烯工艺过程以及催化剂体系,使用廉价醋酸甲酯为原料开发高附加值的下游产品,充分挖掘醋酸甲酯的经济效益,减少对苯二甲酸和聚乙烯醇生产成本,符合我国石油化工生产现状,具有良好的经济效益和社会价值。     

新型有机化工原料-醋酸乙烯

论述了醋酸乙烯的基本性质、合成方法、应用及展望,并介绍了生产醋酸乙烯的新的合成路线。     

生产醋酸乙烯的方法

正本发明涉及到生产醋酸乙烯的方法。本发明提供一种乙烯气相氧化反应生产醋酸乙烯的方法,方法包括:一种任选的制备乙烯的步骤,合成醋酸乙烯步骤和精制醋酸乙烯步骤,在所述三步中,至少一步使用下述蒸汽机再压缩技术,空气冷却器,板式热交     

用乙烯合成醋酸乙烯的进展动态

近两年来,我国科技人员在毛主席无产阶级革命路线指引下,用乙烯合成醋酸乙烯的试验取得了一定的进展。醋酸乙烯是生产维尼纶的主要单体,也是涂料工业的重要原料。在六十年代以前,醋酸乙烯的合成仅限于乙炔法。此法不仅耗电量高,而且消耗大量醋酸,因而成本比较高。随着石油化学工业的迅速发展,为维尼纶纤维的大量发展提供了廉价的乙烯原料。因此,世界各国都相继研究用乙烯代替乙炔合成醋酸乙烯的新工艺合成路线。目前,用乙烯合成醋酸乙烯,有气相固定床法、     

羰化法制醋酸乙烯

本文着重对羰化法制醋酸乙烯的催化技术进行了评述。此法不需要乙烯（或乙炔）及醋酸，而只使用甲醇和合成气即可同时制取醋酸乙烯和醋酐。本文还对醋酸乙烯传统生产方法的生产过程和催化技术进行了简要的评述。     

醋酸乙烯酯乳液聚合数学模型(Ⅰ) 阶段Ⅰ模型

研究了较大亲水性单体醋酸乙烯酯(VAc)乳液聚合的乳胶粒生成和生长过程,提出了VAc乳液聚合阶段Ⅰ数学模型.该模型既考虑到胶束成核机理,又考虑到水相中低聚物沉淀成核机理.研究了自由基解吸与吸附在单体珠滴上的乳化剂对VAc乳液聚合阶段Ⅰ动力学的影响,并对模型预计结果与实验数据进行了比较和讨论.     

Emulsion grafting of vinyl acetate onto preirradiated poly(3‐hydroxybutyrate) film

Vinyl acetate (VAc) was grafted onto poly(3‐hydroxybutyrate) film by a preirradiation method. Grafting reactions were carried out in VAc/water/surfactant emulsion, VAc/water, and VAc/methanol systems. For emulsion grafting, Nonion L‐4 was ascertained to be the optimum surfactant with respect to the stability of a single emulsion layer. The emulsion with a 10 : 1 (w/w) ratio of VAc to surfactant yielded the highest degree of grafting: 23%. The grafting efficiency in the emulsion and the water and methanol solvents were evaluated. The results indicated that the grafting efficiency of the emulsion was 100 times that of VAc/methanol when the same 2 wt % VAc was used in the grafting reaction. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

马来酸酐改性聚醋酸乙烯酯乳液的研究

以马来酸酐(MA)作为醋酸乙烯酯(VAc)的改性共聚单体,采用半连续种子乳液聚合法合成了改性聚醋酸乙烯酯(PVAc)乳液,并考察了MA含量对VAc/MA共聚乳液性能的影响。结果表明:当w(MA)=0.3%～0.4%(相对于VAc质量而言)时,改性乳液的聚合稳定性、储存稳定性和稀释稳定性良好;随着MA含量的不断增加,种子反应阶段回流时间延长,共聚速率变慢,最终合成的改性乳液黏度逐渐增大;当w(MA)=0.4%时,改性乳液的综合性能相对最好,其粘接强度(9.70 MPa)比VAc均聚乳液增加了70%。     

VAc/BA核壳乳液聚合乳胶粒形态模拟

以醋酸乙烯酯和丙烯酸丁酯两种单体两阶段种子聚合制备核壳乳胶粒为例,研究了用簇迁移动力学模拟方法,进行对指定实验条件下核壳形态的预测。结果与实验相符合。讨论了用简化的簇迁移动力学模型方法进行核壳形分子设计的进行步骤。     

核壳乳液聚合乳胶粒形态的研究（Ⅱ）乳胶粒达到平衡形态时间的预测

为了方便地进行核壳乳胶粒达到平衡形态的时间预测,提出了用简化的簇迁移动力学模拟方法进行反应过程中乳胶粒形态演化过程的模拟。以聚醋酸乙烯酯／丙烯酸丁酯体系2阶段种子乳液聚合为例,对指定实验条件下乳胶粒的形态进行预测,结果与实验相符。     

VAc/Veova型可再分散性乳胶粉的工艺条件研究

以聚乙烯醇(PVA)为保护胶体、过硫酸铵(APS)为引发剂、醋酸乙烯(VAc)和改性单体(Veova)为主要原料,采用种子乳液聚合法制备VAc/Veova乳液;然后以此为母液,采用喷雾干燥法制备可再分散性乳胶粉。结果表明:当保护胶体选择低聚合度不完全皂化的PVA、采用连续滴加法加入引发剂、采用前混工艺加入抗结块剂、干燥塔进口温度为150～200℃和出口温度为80～90℃时,VAc/Veova型可再分散性乳胶粉的主要应用性能满足JG 149—2003标准,并且接近甚至超过国内外同类产品。     

Surface photografting polymerization of vinyl acetate (VAc), maleic anhydride (MAH), and their charge transfer complex (CTC). III. VAc(3)

Vinyl acetate (VAc) was grafted onto low‐density polyethylene (LDPE) substrates by UV irradiation with benzophenone (BP) as the photoinitiator. BP preabsorbed film samples and BP precoated film samples were prepared in advance and applied as the substrates onto which VAc was photografted, together with the method in which BP was dissolved in VAc directly. In addition, the efficiency of the polymerizations applying the preirradiation technology was examined. The conversion percent, grafting percent, and grafting efficiency were determined by a gravimetric method. The contact angles of the grafted films against water were also measured. The results show that BP preabsorbing and precoating were favorable to grafting polymerization, especially the BP precoating method, which was due to its simple operation and the ease of controlling the amount of BP. The diffusion of BP and VAc through the substrates proved to be an important factor for grafting polymerization. Through UV irradiation, dormant groups can be introduced onto LDPE film, which may be activated again by UV irradiation or by heating, leading to the formation of free radicals. Grafting polymerization can be initiated during the activation process in the presence of monomer. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1426–1433, 2001     

Acrylonitrile/vinyl acetate copolymer nanofibers with different vinylacetate content

In this study, free radical copolymerization of acrylonitrile (AN)–vinyl acetate (VAc) was performed for five different feed ratio of VAc (wt %) by using ammonium persulfate (APS) in the aqueous medium. The effect of VAc content on the spectrophotometric and thermal properties of AN–VAc copolymers was investigated by Fourier Transform Infrared–Attenuated Total Reflectance spectrophotometer (FTIR–ATR), differential scanning calorimeter (DSC), and thermal gravimetric analyzer (TGA). Thermal stability of homopolymer of AN is improved after being copolymerized. The electrospun P(AN‐co‐VAc) nanofibers were fabricated and the effect of VAc content on the morphologic properties of nanofibers was studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The viscosity of the solution had a significant effect on P(AN‐co‐VAc) electrospinning and the nanofiber morphology. The average diameters of P(AN‐co‐VAc) nanofibers decreased 3.4 times with increasing feed ratio of VAc wt %. The P(AN‐co‐VAc) electrospun nanofiber mats, with the feed ratio of 30 wt % VAc, can be used as a nanofiber membrane in filtration and as a carbon nanofiber precursor for energy storage applications due to high surface to volume ratio, high thermal stability, homogeneous, and thinner nanofiber distribution. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Synthesis of multifunctional polypropylene via solid phase cografting and its grafting mechanism

Functional monomers, maleic anhydride (MAH) and vinyl acetate (VAc), were used as comonomers in the solid‐phase grafting of polypropylene (PP). Quantitative determination of the graft level of both MAH and VAc performed by titration and FTIR methods allowed for a good appreciation of the interaction of MAH and VAc. A product with high‐graft level of both VAc and MAH was obtained when the feeding molar ratio of MAH/VAc approached 1 : 1. The melt flow rate (MFR) of the grafted PP decreased with the increase in the feeding amount of VAc. It was proposed that MAH and VAc molecules could form a kind of stable transition state during the graft polymerization and that the reactivity of both monomers were enhanced. The resulting multifunctional PP offers possibility for the development of novel PP‐based polymer blends and composites, thus extending the application field of PP. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 929–935, 2002; DOI 10.1002/app.10121