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福爱迪,北京丰台房山良乡正规认证翻译公司

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百年福爱迪(北京)翻译有限公司 翻译,世界500强公司翻译服务商。由多年翻译经验的高级翻译创办,翻译领域包括政治、财经、合同、报告、机械、电气等以及国标、标书等大型文件。移民、出国材料,提供译员资质,加盖中英文翻译专用章。提供留学文书创作!希望各界同仁共同切磋,合作。承接各种翻译业务,满意后付款.并提供完善的译后服务。 欢迎来电来函。 地址:北京市房山区良乡绿地启航国际6号楼1506室 website:www.forideal.com 电话:010-83682380 13164266641

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2009-02-11 11:35:18|  分类: 交流栏 |  标签: |举报 |字号 订阅

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这是试译的一段化学类文件。虽然一直努力提高自己,还是感觉做的不够好。希望翻译高手一起探讨。仅供学术目的,翻译公司张贴广告类止步。谢谢。

To 40 g of thin aluminum foil cut in 1 inch squares (in a 2 L wide mouth Erlenmeyer flask) there was added 1400 mL H2O containing 1 g mercuric chloride. Amalgamation was allowed to proceed until there was the evolution of fine bubbles, the formation of a light grey precipitate, and the appearance of occasional silvery spots on the surface of the aluminum. This takes between 15 and 30 min depending on the freshness of the surfaces, the temperature of the H2O, and the thickness of the aluminum foil. (Aluminum foil thickness varies from country to country.) The H2O was removed by decantation, and the aluminum was washed with 2x1400 mL of fresh H2O. The residual H2O from the final washing was removed as thoroughly as possible by shaking, and there was added, in succession and with swirling, 60 g methylamine hydrochloride dissolved in 60 mL warm H2O, 180 mL IPA, 145 mL 25% NaOH, 53 g 'ketone' , and finally 350 mL IPA. If the available form of methylamine is the aqueous solution of the free base, the following sequence can be substituted: add, in succession, 76 mL 40% aqueous methylamine, 180 mL IPA, a suspension of 50 g NaCl in 140 mL H2O that contains 25 mL 25% NaOH, 53 g 'ketone' , and finally 350 mL IPA. The exothermic reaction was kept below 60 ° C with occasional immersion into cold water and, when it was thermally stable, it was allowed to stand until it had returned to room temperature with all the insolubles settled to the bottom as a grey sludge. The clear yellow overhead was decanted and the sludge removed by filtration and washed with MeOH. The combined decantation, mother liquors and washes, were stripped of solvent under vacuum, the residue suspended in 2400 ml of H2O, and sufficient HCl added to make the phase distinctly acidic. This was then washed with 3x75 mL CH2Cl2, made basic with 25% NaOH, and extracted with 3x100 mL of CH2Cl2. After removal of the solvent from the combined extracts, there remained 55 g of an amber oil which was distilled at 100-110 ° C at 0.4 mm/Hg producing 41 g of an off-white liquid. This was dissolved in 200 mL IPA, neutralized with about 17 mL of concentrated HCl, and then treated with 400 mL anhydrous Et2O. After filtering off the white crystals, washing with an IPA/Et2O mixture, (2:1), with Et2O, and final air drying, there was obtained 42.0 g of MMDK(MMDK是最终成品) as a fine white crystal. The actual form that the final salt takes depends upon the temperature and concentration at the moment of the initial crystallization. It can be anhydrous, or it can be any of several hydrated forms. Only the anhydrous form has a sharp mp; the published reports describe all possible one degree melting point values over the range from 148-153 ° C. The variously hydrated polymorphs have distinct infrared spectra, but have broad mps that depend on the rate of heating.

 

1400mL含有1g氯化汞的水加入40g面积为1平方英寸的薄铝箔上(铝箔放置在容积为2L的广口锥形烧瓶中),当出现优质气泡、形成淡灰色沉淀物并在铝的表面不时出现银色斑点时,方可进行汞齐化。这一过程大约需要1530分钟,具体时间取决于表面的清洁度、水的温度及铝箔的厚度(铝箔的厚度因国家而异)。水通过倾析方式除去,而铝则要用2*1400mL的淡水清洗。洗涤之后剩余水通过震动法尽量除去,之后,按顺序加入溶解了60g盐酸甲胺的60mL温水、180mL异丙醇、145mL浓度为25%NaOH53g酮,最后加入350mL的异丙醇,并进行搅拌。如果甲胺的存在形式是自由基水溶液,也可以采取下列顺序:按顺序加入76mL浓度为40%的甲胺水溶液、180mL异丙醇、含有25mL浓度为25%NaOH50g NaCl140mL水悬液、53g酮,最后加入350mL的异丙醇。需要时不时的将烧瓶放入冷水中以保证放热反应的温度低于60;当达到热稳定后,将其放置至室温,届时,所有难溶物质会在瓶底形成灰色沉淀。将上层黄色透明液体轻轻倒出,通过过滤方式将沉淀滤去并用甲醇(MeOH)清洗。通过化合倾析,母液及洗涤剂在真空状态下从溶剂中脱离,剩余物质悬浮在2400mL的水中,加入足够的盐酸(HCl)保证这一阶段呈现明显酸性。然后,用3*75mLCH2Cl2(基本通过浓度为25%NaOH制得)进行清洗,并用3*100mLCH2Cl2进行萃取。除去化合萃取物中的溶剂之后,还会剩下55g的琥珀油,然后在100-110下进行蒸馏,产生41g的近于纯白的液体。这一液体将溶解在200mL的异丙醇里面,并用17mL的浓盐酸进行中和;然后,用400mL的无水Et2O进行处理。将白色晶体过滤之后,用IPA/Et2O21)混合物进行清洗;最后,通过空气干燥,得到42.0gMMDK最终成品,呈优质白色晶体状。盐的最后形状取决于最初结晶时的温度及浓度,因此,可以是无水的,或者是水合式的。只有无水状态下才有具体的熔点,出版的报告描述了所有可能的熔点值,范围从148153;而各种水合多形体则有明显的红外光谱,但是,其熔点取决于加热速度。

 

 
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