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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. 從現(xiàn)代化工和高新技術(shù)發(fā)展的需求出發(fā), 論述了化工分離技術(shù)的重要性、多樣性和復(fù)雜性。分析了化工分離技術(shù)在新世紀(jì)所面臨的新的機(jī)遇和挑戰(zhàn)。并對(duì)當(dāng)代化工分離技術(shù)的發(fā)展特點(diǎn)和我們的對(duì)策進(jìn)行了探討。（10points） 2. 對(duì)綠色化工催化劑的研究進(jìn)展進(jìn)行了綜述, 主要介紹了固體酸催化劑、固體堿催化劑和金屬催化劑的研究現(xiàn)狀, 并對(duì)其應(yīng)用和發(fā)展前景作了總結(jié)和評(píng)述。 關(guān)鍵詞: 綠色化工催化劑; 固體酸催化劑; 固體堿催化劑; 金屬催化劑（10points） |
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血色之夕
鐵蟲 (初入文壇)
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【答案】應(yīng)助回帖
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2.從理論上和實(shí)驗(yàn)上研究了同時(shí)吸收的 H2S 和 CO2 的氣態(tài)流成使用填充的床試點(diǎn)規(guī)模接觸器 MEA 水溶液。作為第一個(gè)結(jié)論，包裝尺寸影響相對(duì)吸收 （選擇性） 的 CO2 和 H2S 在 MEA 溶液作為一種新的擬議結(jié)構(gòu)參數(shù)。 小包裝大小會(huì)導(dǎo)致選擇性的 H2S 吸收減少。結(jié)果還表明，增加的總壓，可以幫助擴(kuò)散吸收中的步驟，可以增加 H2S 吸收選擇性和速度。也可以看到，L/G 作為液相事件潛力降低增加 H2S 吸收選擇性的增加而增加絕對(duì)的吸收速率。它是一樣的當(dāng)胺濃度增加。胺濃度的增加，L/G 和減少包裝尺寸從概念上來(lái)說(shuō)意味著增加吸收潛在每床層體積從而降低選擇性。 （15 分） 3.綠色化學(xué)是設(shè)計(jì)、 開(kāi)發(fā)和實(shí)施的化工產(chǎn)品和過(guò)程，以減少或消除對(duì)人類健康和環(huán)境有害的物質(zhì)的生成和使用。不同污染防治的管理法規(guī)要求，綠色化學(xué)是邁向永續(xù)性創(chuàng)新、 非監(jiān)管、 經(jīng)濟(jì)驅(qū)動(dòng)的辦法。綠色化學(xué)作為設(shè)計(jì)創(chuàng)新的機(jī)會(huì)認(rèn)為整個(gè)生命周期的化學(xué)過(guò)程。而不是控制危害的監(jiān)管限制，綠色化學(xué)挑戰(zhàn)創(chuàng)新設(shè)計(jì)和 利用物質(zhì)和能量以提高性能和價(jià)值，同時(shí)保護(hù)人類健康和 environment.(10points) 的方式 4.鉻酸鹽的擴(kuò)散系數(shù)是取自文學(xué)作品。懸浮固體擴(kuò)散率的影響試驗(yàn)控制的葉輪腐蝕，使用了陶瓷顆粒。粒徑范圍為 0.3 ~ 0.7 毫米時(shí)粒子濃度為 1%~ 3%的體積。為了測(cè)試阻力減少聚合物上的擴(kuò)散率的影響控制的葉輪，聯(lián)合碳化物公司產(chǎn)品懸浮物濃度 200、 200、 400 的表單中使用的氧化聚乙烯 (polyox WSR 301) 腐蝕和 500 ppm。固體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。聚合物用作收到并沒(méi)有試圖分開(kāi)不同的大小。在酸化鉻酸鹽聚合物的化學(xué)穩(wěn)定性在單獨(dú)的實(shí)驗(yàn)測(cè)試通過(guò)將 polyox 添加到酸化鉻酸溶液 （空白） 為 1 h 后的測(cè)定鉻酸鹽濃度、 鉻酸鹽濃度沒(méi)有變化發(fā)現(xiàn)采取的地方，即 polyox 是化學(xué)穩(wěn)定在本研究中使用的解決方案中。流變測(cè)量表明，所有聚合物包含解決方案牛頓;聚合物的加入固體顆粒對(duì)空白溶液的形式被發(fā)現(xiàn)有對(duì)解決方案的物理性能的影響微乎其微。表 1 顯示 solutions.(20points) 的物理屬性 5.常見(jiàn)的氧化偶聯(lián)反應(yīng)器設(shè)計(jì)了流化的床，雖然許多其它設(shè)計(jì)也正在考慮。在反應(yīng)器中，甲烷 (CH4) 和氧反應(yīng)，生成水和甲基自由基 (CH3) 催化劑。這種反應(yīng)稱為甲烷部分氧化反應(yīng)。甲基自由基結(jié)合起來(lái)，形成更高的烷烴，大多是乙烷 (C2H6) 的脫氫成乙烯 (C2H4)。催化劑的功能是控制氧離子的活性，使反應(yīng)可以被保存在所需的路徑。完全氧化 （快速形成的 CO2 前窗體乙烷和乙烯基鏈接） 是一種不受歡迎的反應(yīng)。使用的催化劑是主要的堿、 堿土金屬和其他稀土金屬的氧化物。有時(shí)添加氫和蒸汽以減少結(jié)焦催化劑。后一通，大致飼料質(zhì)量全氧含量的 80%是被消耗。理想情況下，100%理想因?yàn)檠鯕夂茈y分開(kāi)，可以導(dǎo)致不受歡迎的燃燒甚至爆炸。甲烷的大規(guī)�；A(chǔ)上每通乙烯產(chǎn)率是由于低轉(zhuǎn)化率和乙烯選擇性差 30%左右。() 15points |
7樓2016-03-11 10:49:27
liulion2008
木蟲 (小有名氣)
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【答案】應(yīng)助回帖
★ ★
感謝參與，應(yīng)助指數(shù) +1
hanches: 金幣+2, 感謝應(yīng)助，BB獎(jiǎng)勵(lì)~~~ 2014-01-09 08:50:52
感謝參與，應(yīng)助指數(shù) +1
hanches: 金幣+2, 感謝應(yīng)助，BB獎(jiǎng)勵(lì)~~~ 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. 使用中試規(guī)模的帶有填料床的吸收器，在MEA水溶液（作為填料）中同時(shí)從氣態(tài)蒸氣中吸收硫化氫和二氧化碳的工藝已經(jīng)過(guò)理論和實(shí)踐研究。第一個(gè)結(jié)論是填料床的大小會(huì)影響硫化氫和二氧化碳在MEA水溶液中的相對(duì)吸收（選擇性）。因此填料床的大小就構(gòu)成影響相對(duì)吸收的結(jié)構(gòu)參數(shù)。 |
2樓2014-01-08 14:01:04
liulion2008
木蟲 (小有名氣)
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【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
chubin555: 金幣+20 2014-01-08 20:05:29
chubin555: 金幣+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.縮小填料床的大小會(huì)降低硫化氫吸收的選擇性。試驗(yàn)結(jié)果還顯示，增加氣壓可以改善氣液結(jié)合，從而增加硫化氫的吸收選擇性和速率�？梢灶A(yù)見(jiàn)提升L/G（液氣比）會(huì)使吸收選擇性降低，但同時(shí)會(huì)提升吸收速率。提高M(jìn)EA水溶液的濃度會(huì)產(chǎn)生相同的結(jié)果。因此，同時(shí)提高M(jìn)EA水溶液的濃度、提升L/G（液氣比）和縮小填料床的大小會(huì)提高填料床單位體積的吸收速率，也會(huì)降低吸收選擇性。 |
3樓2014-01-08 14:24:19
liulion2008
木蟲 (小有名氣)
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【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
chubin555: 金幣+20, ★★★★★最佳答案 2014-01-08 20:05:22
chubin555: 金幣+20, ★★★★★最佳答案 2014-01-08 20:05:22
| 3.綠色化學(xué)是從設(shè)計(jì)、研發(fā)和生產(chǎn)等多角度同時(shí)考慮如何減少和消除能對(duì)人身健康和環(huán)境能造成危害的化學(xué)物質(zhì)的產(chǎn)生和使用的工藝過(guò)程。與污染防治法律法規(guī)要求不同的是，綠色化學(xué)是一種創(chuàng)新性、經(jīng)濟(jì)利益驅(qū)動(dòng)性和不帶有法律強(qiáng)制性的可持續(xù)發(fā)展概念。綠色化學(xué)把化學(xué)品的整個(gè)生命周期作為設(shè)計(jì)革新的著眼點(diǎn)。與法律法規(guī)控制有害物質(zhì)的目的不同，綠色化學(xué)在保護(hù)人身健康和環(huán)境的同時(shí)，就如何利用物質(zhì)和能源創(chuàng)造更多效能和價(jià)值提出新型挑戰(zhàn)。 |
4樓2014-01-08 14:49:45
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[考研] 26考研調(diào)劑 +4 | Wnz.20030617 2026-04-01 | 5/250 |
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[考研] 266分，一志愿電氣工程，本科材料，求材料專業(yè)調(diào)劑 +4 | 哇呼哼呼哼 2026-04-02 | 4/200 |
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[考研] 材料求調(diào)劑 一志愿哈工大總分298分，前三科223分 +12 | dongfang59 2026-03-27 | 12/600 |
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[考研] 085600，材料與化工321分，求調(diào)劑 +13 | 大饞小子 2026-03-27 | 13/650 |
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[考研] 385分 生物學(xué)（071000）求調(diào)劑 +6 | qf626 2026-04-01 | 6/300 |
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[考研] 354求調(diào)劑 +4 | lxb598 2026-03-31 | 5/250 |
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[考研] 材料調(diào)劑 +12 | 一樣YWY 2026-04-01 | 12/600 |
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[考研] 085410 一志愿211 22408分?jǐn)?shù)359求調(diào)劑 +3 | 123456789qw 2026-03-31 | 4/200 |
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[考博] 26年申博 +3 | staryer 2026-03-30 | 4/200 |
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[考研] 086502化學(xué)工程342求調(diào)劑 +7 | 阿姨復(fù)古不過(guò) 2026-03-27 | 7/350 |
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[考研] 086000生物與醫(yī)藥298調(diào)劑求助 +4 | 元元青青 2026-03-31 | 6/300 |
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[考研] 309分085801求調(diào)劑 +7 | 學(xué)員Gtwj7W 2026-03-31 | 7/350 |
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[考研] 一志愿a區(qū)211，085601-307分求調(diào)劑 +10 | 黨嘉豪 2026-03-31 | 23/1150 |
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[考研] 一志愿華東師范大學(xué)有機(jī)化學(xué)專業(yè)，初試351分，復(fù)試被刷求調(diào)劑! +9 | 真名有冰 2026-03-29 | 10/500 |
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[考研] 本2一志愿C9-333分，材料科學(xué)與工程，求調(diào)劑 +9 | 升升不降 2026-03-31 | 9/450 |
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[考研] 085600材料與化工調(diào)劑 +16 | kikiki7 2026-03-30 | 16/800 |
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[有機(jī)交流]
 甲基亞磺磺酸鈉和甲基磺酸酯反應(yīng)機(jī)理
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kaobao456 2026-03-29 | 4/200 |
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[考研] 332求92調(diào)劑 +8 | 蕉蕉123 2026-03-28 | 8/400 |
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[考研] 081200-11408-276學(xué)碩求調(diào)劑 +6 | 崔wj 2026-03-26 | 6/300 |
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[考研] 315調(diào)劑 +4 | 0860求調(diào)劑 2026-03-26 | 5/250 |
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