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chubin555

金虫 (小有名气)

[求助] 化工专业英语考试求助已有3人参与

2. Simultaneous absorption of H2S and CO2 from gaseous streams into an aqueous MEA solution using a packed bed pilot-scale contactor has been studied theoretically and experimentally. As a first conclusion, the packing size affects the relative absorption (selectivity) of CO2 and H2S in MEA solution as a new proposed structural parameter.
Smaller packing size leads to decrease in selectivity of H2S absorption. The results also show that, increasing of total pressure, which helps the diffusion steps in absorption, increases the H2S absorption selectivity and rate. It also could be seen that increasing L/G as a potential for liquid phase events, decreases the H2S absorption selectivity while increases the absolute rate of absorption. It is the same, when amine concentration is increased. Increasing the amine concentration, L/G and decreasing the packing size conceptually means the increase in absorption potential per bed volume which decreases the selectivity.(15 points)
3. Green Chemistry is the design, development, and implementation of chemical products and processes to reduce or eliminate the use and generation of substances hazardous to human health and the environment. Unlike regulatory requirements for pollution prevention, Green Chemistry is an innovative, non-regulatory, economically driven approach toward sustainability. Green Chemistry considers the entire life cycle of chemical processes as an opportunity for design innovation. Rather than regulatory restrictions for controlling hazards, Green Chemistry challenges innovators to design and
utilize matter and energy in a way that increases performance and value while protecting human health and the environment.(10points)
4. Diffusivity of chromate was taken from the literature. To test the effect of suspended solids on the rate of diffusion controlled corrosion of the impeller, porcelain particles were used. Particle size ranged from 0.3 to 0.7 mm while particle concentration ranged from 1% to 3% by volume. In order to test the effect of drag reducing polymers on the rate of diffusion controlled corrosion of the impeller, polyethylene oxide (polyox WSR-301) a product of Union Carbide was used in the form of suspension at concentrations of 200, 200, 400 and 500 ppm. The solid polymer powder has a density of
1.15±1.26 g/cm3, particle size ranged from less than 38 mm to larger than 500 mm. The polymer was used as received and no attempt was made to separate different sizes. The chemical stability of the polymer in acidified chromate was tested in separate experiments by adding polyox to acidified chromate solution (blank) for 1 h after which chromate concentration was determined, no change in chromate concentration was found to take place, i.e polyox is chemically stable in the solutions used in the present study. Rheological measurements showed that all polymer containing solutions were Newtonian; polymer addition in the form of solid particles to the blank solution was found to have a negligible effect on the physical properties of the solutions. Table 1 shows the physical properties of the solutions.(20points)
5. A common oxidative coupling reactor design has a fluidized bed, though many other designs are also being considered. In the reactor, methane (CH4) and oxygen react over a catalyst to form water and a methyl radical (CH3). This reaction is called partial oxidation of methane. The methyl radicals combine to form a higher alkane, mostly ethane (C2H6) which dehydrogenates into ethylene (C2H4). The function of the catalysts is to control the activity of oxygen ions so that reactions can be kept on the desired path. Complete oxidation (rapid formation of CO2 before the radicals link up to form ethane and ethylene) is an undesired reaction. The catalysts used are mostly oxides of alkali, alkaline earth and other rare earth metals. Hydrogen and steam are sometimes added to reduce coking on catalysts. After one pass, roughly 80% of the total oxygen feed by mass is consumed. Ideally, 100% is desired since oxygen is difficult to separate and can cause undesired combustion or even explosion. The per-pass ethylene yield on a mass basis of methane is about 30% due to low conversion and poor selectivity to ethylene. (15points)

Ⅱ. Translate the following paragraphs into English:
1. 从现代化工和高新技术发展的需求出发, 论述了化工分离技术的重要性、多样性和复杂性。分析了化工分离技术在新世纪所面临的新的机遇和挑战。并对当代化工分离技术的发展特点和我们的对策进行了探讨。(10points)
2. 对绿色化工催化剂的研究进展进行了综述, 主要介绍了固体酸催化剂、固体碱催化剂和金属催化剂的研究现状, 并对其应用和发展前景作了总结和评述。
关键词: 绿色化工催化剂; 固体酸催化剂; 固体碱催化剂; 金属催化剂(10points)
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liulion2008

木虫 (小有名气)

【答案】应助回帖

★ ★
感谢参与,应助指数 +1
hanches: 金币+2, 感谢应助,BB奖励~~~ 2014-01-09 08:50:52
2. Simultaneous absorption of H2S and CO2 from gaseous streams into an aqueous MEA solution using a packed bed pilot-scale contactor has been studied theoretically and experimentally. As a first conclusion, the packing size affects the relative absorption (selectivity) of CO2 and H2S in MEA solution as a new proposed structural parameter. 使用中试规模的带有填料床的吸收器,在MEA水溶液(作为填料)中同时从气态蒸气中吸收硫化氢和二氧化碳的工艺已经过理论和实践研究。第一个结论是填料床的大小会影响硫化氢和二氧化碳在MEA水溶液中的相对吸收(选择性)。因此填料床的大小就构成影响相对吸收的结构参数。
2楼2014-01-08 14:01:04
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liulion2008

木虫 (小有名气)

【答案】应助回帖

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chubin555: 金币+20 2014-01-08 20:05:29
Smaller packing size leads to decrease in selectivity of H2S absorption. The results also show that, increasing of total pressure, which helps the diffusion steps in absorption, increases the H2S absorption selectivity and rate. It also could be seen that increasing L/G as a potential for liquid phase events, decreases the H2S absorption selectivity while increases the absolute rate of absorption. It is the same, when amine concentration is increased. Increasing the amine concentration, L/G and decreasing the packing size conceptually means the increase in absorption potential per bed volume which decreases the selectivity.缩小填料床的大小会降低硫化氢吸收的选择性。试验结果还显示,增加气压可以改善气液结合,从而增加硫化氢的吸收选择性和速率。可以预见提升L/G(液气比)会使吸收选择性降低,但同时会提升吸收速率。提高MEA水溶液的浓度会产生相同的结果。因此,同时提高MEA水溶液的浓度、提升L/G(液气比)和缩小填料床的大小会提高填料床单位体积的吸收速率,也会降低吸收选择性。
3楼2014-01-08 14:24:19
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liulion2008

木虫 (小有名气)

【答案】应助回帖

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chubin555: 金币+20, ★★★★★最佳答案 2014-01-08 20:05:22
3.绿色化学是从设计、研发和生产等多角度同时考虑如何减少和消除能对人身健康和环境能造成危害的化学物质的产生和使用的工艺过程。与污染防治法律法规要求不同的是,绿色化学是一种创新性、经济利益驱动性和不带有法律强制性的可持续发展概念。绿色化学把化学品的整个生命周期作为设计革新的着眼点。与法律法规控制有害物质的目的不同,绿色化学在保护人身健康和环境的同时,就如何利用物质和能源创造更多效能和价值提出新型挑战。
4楼2014-01-08 14:49:45
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liulion2008

木虫 (小有名气)

【答案】应助回帖

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chubin555: 金币+18 2014-01-08 20:05:34
5.通常氧化偶联反应釜都设计有一个流化床,虽然其他设计类型的反应釜也逐渐被认可。在这种反应釜内,甲烷和氧气在催化剂的作用下反应生成水和游离甲基。这种反应被称为甲烷的局部氧化反应。游离甲基相互结合生成更高等级烷烃,大多数乙烷脱氢生成乙烯。催化剂的作用就是控制氧离子的活动,使反应按照预期路线进行。完全氧化反应(在游离基团相互连接形成烷烃和烯烃之前,形成二氧化碳)不是预期的反应路线。常见的催化剂大多数是碱金属氧化物、碱土和其他稀土金属。反应过程中经常会通入氢气或水蒸气以减少催化剂焦化。一轮反应之后,按质量计算大约80%的氧气被反应消耗掉。理想状态是100%的氧气被消耗,因为残余氧气很难从最终产品中分离,还有可能造成燃烧或爆炸。粗略估计,按甲烷的质量分数计算,乙烯的收率是30%,主要原因是低转化率和(催化剂的)低选择性。
5楼2014-01-08 16:51:54
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流浪者kk

新虫 (初入文坛)


引用回帖:
5楼: Originally posted by liulion2008 at 2014-01-08 16:51:54
5.通常氧化偶联反应釜都设计有一个流化床,虽然其他设计类型的反应釜也逐渐被认可。在这种反应釜内,甲烷和氧气在催化剂的作用下反应生成水和游离甲基。这种反应被称为甲烷的局部氧化反应。游离甲基相互结合生成更高 ...

大神,可不可以帮我翻译几篇?可以是有偿的
6楼2016-03-10 22:52:23
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血色之夕

铁虫 (初入文坛)

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2.从理论上和实验上研究了同时吸收的 H2S 和 CO2 的气态流成使用填充的床试点规模接触器 MEA 水溶液。作为第一个结论,包装尺寸影响相对吸收 (选择性) 的 CO2 和 H2S 在 MEA 溶液作为一种新的拟议结构参数。
小包装大小会导致选择性的 H2S 吸收减少。结果还表明,增加的总压,可以帮助扩散吸收中的步骤,可以增加 H2S 吸收选择性和速度。也可以看到,L/G 作为液相事件潜力降低增加 H2S 吸收选择性的增加而增加绝对的吸收速率。它是一样的当胺浓度增加。胺浓度的增加,L/G 和减少包装尺寸从概念上来说意味着增加吸收潜在每床层体积从而降低选择性。 (15 分)
3.绿色化学是设计、 开发和实施的化工产品和过程,以减少或消除对人类健康和环境有害的物质的生成和使用。不同污染防治的管理法规要求,绿色化学是迈向永续性创新、 非监管、 经济驱动的办法。绿色化学作为设计创新的机会认为整个生命周期的化学过程。而不是控制危害的监管限制,绿色化学挑战创新设计和
利用物质和能量以提高性能和价值,同时保护人类健康和 environment.(10points) 的方式
4.铬酸盐的扩散系数是取自文学作品。悬浮固体扩散率的影响试验控制的叶轮腐蚀,使用了陶瓷颗粒。粒径范围为 0.3 ~ 0.7 毫米时粒子浓度为 1%~ 3%的体积。为了测试阻力减少聚合物上的扩散率的影响控制的叶轮,联合碳化物公司产品悬浮物浓度 200、 200、 400 的表单中使用的氧化聚乙烯 (polyox WSR 301) 腐蚀和 500 ppm。固体聚合物粉末的密度是
1.15±1.26 g/c m 3, 粒度小于 38 毫米至大于 500 毫米不等。聚合物用作收到并没有试图分开不同的大小。在酸化铬酸盐聚合物的化学稳定性在单独的实验测试通过将 polyox 添加到酸化铬酸溶液 (空白) 为 1 h 后的测定铬酸盐浓度、 铬酸盐浓度没有变化发现采取的地方,即 polyox 是化学稳定在本研究中使用的解决方案中。流变测量表明,所有聚合物包含解决方案牛顿;聚合物的加入固体颗粒对空白溶液的形式被发现有对解决方案的物理性能的影响微乎其微。表 1 显示 solutions.(20points) 的物理属性
5.常见的氧化偶联反应器设计了流化的床,虽然许多其它设计也正在考虑。在反应器中,甲烷 (CH4) 和氧反应,生成水和甲基自由基 (CH3) 催化剂。这种反应称为甲烷部分氧化反应。甲基自由基结合起来,形成更高的烷烃,大多是乙烷 (C2H6) 的脱氢成乙烯 (C2H4)。催化剂的功能是控制氧离子的活性,使反应可以被保存在所需的路径。完全氧化 (快速形成的 CO2 前窗体乙烷和乙烯基链接) 是一种不受欢迎的反应。使用的催化剂是主要的碱、 碱土金属和其他稀土金属的氧化物。有时添加氢和蒸汽以减少结焦催化剂。后一通,大致饲料质量全氧含量的 80%是被消耗。理想情况下,100%理想因为氧气很难分开,可以导致不受欢迎的燃烧甚至爆炸。甲烷的大规模基础上每通乙烯产率是由于低转化率和乙烯选择性差 30%左右。() 15points
7楼2016-03-11 10:49:27
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sqlg888

铁虫 (正式写手)

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汉译英:
对绿色化工催化剂的研究进展进行了综述, 主要介绍了固体酸催化剂、固体碱催化剂和金属催化剂的研究现状, 并对其应用和发展前景作了总结和评述。
关键词: 绿色化工催化剂; 固体酸催化剂; 固体碱催化剂; 金属催化剂

Advances in research and development of new-catalyst were reviewed in this paper. Researches in solid acid catalyst, solid base catalyst and metal catalyst and their prospect of application were discussed.
Keywords: green chemistry catalyst; solid acid catalyst; solid base catalyst; metal catalyst
8楼2016-03-13 10:13:43
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