Pd-Pb/Al2O3催化剂上甲基丙烯醛氧化酯化合成甲基丙烯酸甲酯

引言 甲基丙烯酸甲酯(MMA)是生产有机玻璃(PMMA)的核心单体,目前主要采用丙酮氰醇法(ACH法)生产,此法工艺流程长、原子经济性低(约47%)、经济效益差、环境污染严重,因此,开发一条绿色高效的合成工艺路线意义重大.     

制造MMA的新ACH法

日本三菱瓦斯化学公司开发成功不副产硫酸铵的 MMA(甲基丙烯酸酯)制造方法,取名为新 ACH(丙烯氰醇)法。新 ACH 法以丙酮与甲醇为原料,甲醇脱水得到的甲醇甲酯与 ACH 水合得到的羟基异丁酸酰胺反应,生成羟基异丁醇甲酯和甲酰胺,前者催化脱水制成 MMA,甲酰胺循环作为制造 ACH 的新料。该法不必处理硫酸铵,反应在常温常压下进行,节省投     

异丁烯两步氧化法生产甲基丙烯酸甲酯技术经济分析

一、概述甲基丙烯酸甲酯(MMA)的传统制法是丙酮氰醇(ACH)法,其主要原料为丙酮、氢氰酸、硫酸和甲醇。ACH 法自1937年由英国帝国化学工业公司(ICI)工业化以来,到1982年的45年间,在世界范围内一直是制造MMA 的唯一方法。这是由于 ACH 法的原料价廉易得,在经济上有竞争力。从四十年代以来,世界上有些国家开展了制造 MMA 新方法的研究。日本从五十年代中期开始这方面的研究工作。为了扩大原料来源,降低成本,     

甲基丙烯酸甲酯的生产技术及其研究进展

概述了甲基丙烯酸甲酯(MMA)主要生产方法,包括丙酮氰醇法(ACH法)、改进丙酮氰醇法(MGC法)、异丁烯氧化法、乙烯羰基化法(BASF法)、Alpha法等及其研究进展,提出了今后的发展方向。     

制造MMA的新ACH法

日本三菱瓦斯化学公司开发成功不副产硫酸铵的MMA(甲基丙烯酸酯)制造方法,取名为新ACH(丙烯氰醇)法。今年在新泻工厂建设1吨/日的中试装置,计划1991年底建成5万吨/年的生产装置。采用传统的ACH法的5万吨/年MMA装置,每年大约副产7～9万吨硫酸铵,由于硫酸铵的需要量有限,销售较困难,通常把     

甲基丙烯酸甲酯的合成技术研究进展

概述了甲基丙烯酸甲酯(MMA)的合成方法,包括丙酮氰醇法、异丁烯法及乙烯法,并分析了各个合成方法的优缺点,丙酮氰醇法使用有毒原料HCN并会产生大量废料,不符合绿色生产要求,将会面临逐步淘汰,异丁烯法及乙烯法生产过程绿色清洁,符合我国国情及战略需求,是未来的主要发展方向.此外,也对用于异丁烯法生产MMA的钯系催化剂及金系...     

甲基丙烯酸甲酯的ACH生产工艺研究

ACH法操作弹性大,目前在中国MMA仍是最主要的生产方法,在欧,美地区也广泛采用。本文结合实际生产经验对ACH法的生产工艺、原料配比、反应温度、压力进行了讨论。     

异丁烯氧化制甲基丙烯酸甲酯

当前,生产甲基丙烯酸甲酯(MMA)均用1930年英国帝国化学公司的丙酮氰醇(ACH)法。丙酮和氰氢酸是主要原料。该法包括下面三个阶段:     

甲基丙烯酸甲酯的技术进展

1.生产技术与开发进展1.1生产技术1909年,Roehm与Otta Hass组建了化学品生产公司,1933年,该公司建成第一套甲基丙烯酸甲酯(MMA)工业化装置。其合成路线是先将丙酮与氰化氢反应生成丙酮氰醇(ACH),再将ACH转化成α-羟基异丁酸酯,最后用五氯化磷为脱水剂脱水生成甲基丙烯酸甲酯。1     

甲基丙烯酸甲酯新生产工艺的研究

目前,世界MMA总产量约为220万t,主要集中在美国、西欧和日本.我国MMA总产量仅2万t左右,不足世界产量的1%,且我国企业全部采用传统的以丙酮和氢氰酸(HCN为原料的丙酮氰醇(ACH)法,规模小、效益差、污染重,严重制约着MMA行业的发展.     

甲基丙烯酸甲酯与醇酸树脂的共聚改性

引　言涂料对物体和各种材料有保护、装饰和赋予特种功能的作用 ,用量很大 .其中醇酸树脂系列涂料具有价廉通用、易施工等优点 ,是应用最广的一种涂料 .然而醇酸树脂涂料存在涂膜干燥缓慢、硬度低、耐水性较差等缺点 ,因此对醇酸树脂进行改性以使其扬长避短 ,一直很受人们的关注[1] .醇酸树脂的改性包括聚氨酯、苯乙烯和丙烯酸等改性 ,关于丙烯酸改性醇酸树脂虽有不少文献报道[2 ,3 ] ,但其合成改性树脂的原料选择范围较窄 (使用含有共轭双键的植物油 ,如桐油或脱水蓖麻油等 ) ,树脂组分间相容性不好 ,其应用受到限制 .本文研究甲基丙烯酸甲…     

催化剂的研究

甲基丙烯酸甲酯(MMA)是生产有机玻璃的原料,广泛用于表面涂层、合成树脂、油漆涂料、胶粘剂工业和医用高分子材料工业。本文比较了合成MMA不同工艺路线的优缺点,综述了采用异丁烯法制MMA的技术工艺及其催化剂的研究进展,重点介绍了异丁烯两步法制MMA催化剂的研制情况,展望了MMA合成工艺的未来发展趋势。     

Mechanism analysis and simulation of methyl methacrylate production coupled chemical looping gasification system

Nowadays,the efficient and cleaner utilization of coal have attracted wide attention due to the rich coal and rare oil/gas resources structure in China.Coal chemical looping gasification (CCLG) is a promising coal utilization technology to achieve energy conservation and emission reduction targets for highly pure synthesis gas.As a downstream product of synthesis gas,methyl methacrylate (MMA),is widely used as raw material for synthesizing polymethyl methacrylate and resin products with excellent properties.So this paper proposes a novel system integrating MMA production and CCLG (CCLG-MMA) processes aim-ing at "energy saving and low emission",in which the synthesis gas produced by CCLG and purified by dry methane reforming (DMR) reaction and Rectisol process reacts with ethylene for synthesizing MMA.Firstly,the reaction mechanism of CCLG is investigated by using Reactive force field (ReaxFF)MD simulation based on atomic models of char and oxygen carrier (Fe2O3) for obtaining optimum reac-tion temperature of fuel reactor (FR).Secondly,the steady-state simulation of CCLG-MMA system is car-ried out to verify the feasibility of MMA production.The amount of CO2 emitted by CCLG process and DMR reaction is 0.0028 (kg CO2)-1·(kg MMA)-1.The total energy consumption of the CCLG-MMA system is 45521 kJ·(kg MMA)-1,among which the consumption of MMA production part is 25293 kJ·(kg MMA)-1.The results show that the CCLG-MMA system meets CO2 emission standard and has lower energy con-sumption compared to conventional MMA production process.Finally,one control scheme is designed to verify the stability of CCLG-MMA system.The CCLG-MMA integration strategy aims to obtain highly pure MMA from multi-scale simulation perspectives,so this is an optimal design regarding all factors influencing cleaner MMA production.     

甲基丙烯酸甲酯-甲醇-水共沸体系萃取分离工艺模拟

针对甲基丙烯酸甲酯?甲醇?水共沸体系,分别选择水、正己烷和水?正己烷双溶剂为萃取剂建立分离流程进行模拟, 建立单溶剂、双溶剂萃取工艺过程进行全流程模拟,采用灵敏度分析优化工艺过程的溶剂比和操作温度. 结果表明,双溶剂萃取工艺比水、正己烷单溶剂萃取工艺能耗分别降低15.1%和34.9%. 采用绿色度评价方法量化3种分离工艺对环境的影响,水、正己烷、水?正己烷双溶剂萃取工艺的绿色度分别为–7.25, –21.3和–6.75 gd.     

甲基丙烯酸甲酯新工艺

描述了日本三菱瓦斯化学公司以甲醇、一氧化碳和丙酮为起始原料，经丙酮氰醇制取甲基丙烯酸甲酯的新工艺以及化学系统公司的概念设计流程与传统丙酮氰醇工艺的简单经济比较。     

甲基丙烯酸甲酯生产工艺及技术经济比较

从技术性和经济性角度评述了甲基丙烯酸甲酯的生产工艺,包括丙酮氰醇(ACH)法、异丁烯／叔丁醇法、乙烯法和异丁烷氧化法,认为异丁烯直接氧化工艺具有原料来源广泛、收率高、环境污染小的特点。     

Electron-sensitive resists. II. Positive resists derived from high polymers of methyl methacrylate,methyl α-chloroacrylate,and hexyl methacrylate

This paper reports the synthesis, characterization, and evaluation of copolymers of methyl methacrylate (MMA) and hexyl methacrylate (HMA) and of HMA and methyl α-chloroacrylate (MCA) and of terpolymers of MMA, MCA, and HMA as electron-sensitive positive resists. The sensitivities of the resists were found to be strongly dependent on the composition. Two of the terpolymers were found to be significantly more sensitive than poly(methyl methacrylate) (PMMA).     

Grafting and properties of a porous poly(methyl methacrylate) film on a silicon surface by a one‐step dipping method

In this study, we prepared a porous poly(methyl methacrylate) (PMMA) film on an Si surface with a novel dipping method. We conducted the process by directly dipping the Si substrate into acidic aqueous media in a simple flask at 10 °C. First, 4‐nitrobenzene diazonium tetrafluoroborate (NBD) was spontaneously reduced at the Si surface. Then, the aryl radicals during the reduction of NBD were directly grafted onto the Si surface. Meanwhile, the aryl radicals initiated the polymerization of methyl methacrylate (MMA) monomers, and the radical‐terminated PMMA chains formed in the solution were grafted onto the Si surface. Because water was a poor solvent for MMA, the grafted PMMA chains easily aggregated together, and this resulted in a porous polymer film. The porosity of the film depended on the grafting time and the MMA concentration. Furthermore, the permittivity of the porous PMMA film was relatively low, and its dielectric dissipation factor was extremely small. Therefore, its excellent dielectric properties should allow the porous film to have many applications in industry. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44930.     

快干卷烟胶用VAc/AA/MMA三元共聚乳液的制备

以醋酸乙烯酯(VAc)、丙烯酸(AA)和甲基丙烯酸甲酯(MMA)等为原料合成了一种快干卷烟胶用三元共聚乳液。以单体配比、聚合温度和保温时间等为主要因素,乳液固含量为考核指标,采用L9(34)正交实验法优选合成三元共聚乳液的最佳工艺条件。实验结果表明,当n(VAc)∶n(MMA)∶n(AA)=4.5∶1.4∶0.1、聚合温度为70℃以及无回流后在92℃左右的保温时间为30min时,所制取的三元共聚乳液的综合性能较好,其固含量为38.42%,黏度为1120mPa·s,并且完全满足快干卷烟胶的使用要求。