查询词典 acetic acid

This study has hypothesized that high concentration of nitrate, acetic and chorine ions in the scrubbing water lowers the water vapor pressure which in turn reduces the relative humidity of the scrubber outlet from 90~100% to below 80%. As a result, nitric acid can't absorb water to grow into visible white smoke particles.

本研究推论白烟消失的原因是因为含有高浓度硝酸根离子、醋酸根离子及氯离子之洗涤水蒸气压变低，使得洗涤塔出口的相对湿度由90~100%降低至80%以下，因而使得硝酸无法反应及成长成可见之白烟微粒。

All compounds are synthesized starting from the acylation reaction of gallic acid with L-glutamine to form the basic scaffold, followed by the cyclic reaction in acetic anhydride and the key intermediate cyclic anhydride (compound 4) was obtained. The intermediate compound is condensed with different amino acids or primary amines, and produces the target compounds.

本研究以L－谷氨酸为基本骨架，与甲醚化保护的没食子酸缩合后，经过酰化、环合反应得到关键中间体环状酸酐（化合物4），再经胺解反应合成目标化合物，其化学结构经过红外光谱、电喷雾质谱和核磁共振谱（氢谱、碳谱、碳氢异核多键相关谱）确证。

Our subordinate companies exclusively distribute chemical raw material awarded from province and ministry such as 10,000-30,000 unit amylase, protease, high grade different propyl alcohol, cymene naphthalene, glacial acetic acids, Adipic acid, emulsifier, Sodium hexametaphosphate, industry alcohol, etc.

下属分厂专业生产省优部优淀粉酶1-3万单位、蛋白酶、植酸酶、木聚糖酶、优质异丙醇、甲基萘、冰醋酸、α-乙酰乳酸脱羧酶、乳化剂、六偏磷酸钠、工业酒精等化工原料。

For the first time acetic anhydride was used as solvent to disperse HAp particles, which avoided adding acid solution into the suspension and the gas formed by the electroanalysis of water.

石02具有介于钦和HAp之间的热膨胀系数，起到过渡层的作用，从而可降低烧结后涂层和基底之间的残余应力，减少 HAp涂层裂纹的发生，进一步改善了涂层的结合性能。

The invention discloses a method for synthesizing acetyl tributyl citrate, which uses tributyl citrate and acetic anhydride as reaction articles, uses naphthalenesulfonic acid methylal as the catalyst during the ester synthesis process, filtering the catalyst from reacted articles after reaction, water-washing, alkaline-washing, distilling the filtrate to obatin acetyl tributyl citrate.

本发明公开了一种合成乙酰柠檬酸三丁酯的方法，它以柠檬酸三丁酯、乙酸酐为反应物，在酯合成过程中用萘磺酸甲缩醛作催化剂，反应结束后，将催化剂从反应后的物料中过滤出来，滤液经水洗、碱洗、蒸馏获得乙酰柠檬酸三丁酯。

Naphthyl aceate was synthesized with acetic anhydride and naphthol using aminosulfonic acid as catalyst.

以氨基磺酸为催化剂，用乙酸酐和β-萘酚合成了乙酸β萘酯。

It was studied that decolorizing method of brown Silkworm separated protein by acetic peracid and modification of the decolorizing product by acid anhydride and zirconium sulfate.

研究了褐变蚕蛹分离蛋白脱色方法及其酸酐、硫酸锆改性。

Project Background and Conditions: The company started research new chemical products in 1998. After two years of efforts, a series of pharmaceutical intermediate sulfathiazole leave instructions, including : 3- methyl sulfathiazole leave instructions, 2- sulfathiazole leave instructions ethanoic acid, 2- acetyl sulfathiazole leave instructions, 2-thiofuran amino ethane ,2-thiofuran acetic, 3,4,5- tighter nitrobenzene have been successfully developed. 2-thiofuran amino ethane are the precursors raw materials of series antibiotic analgesic.

二、项目建设背景及条件：1998年公司开始研究开发高新精细化工产品，经过两年的努力，已成功研制出噻吩系列医药中间体，包括：3-甲基噻吩、2-噻吩乙酸、2-乙酰噻吩、2-噻吩乙胺、2-噻吩乙醇、3，4，5-三氯硝基苯等。2-噻吩乙胺系列噻吩产品使用于血小板及血栓有关的心脏血管病及消炎镇痛等如氯吡格雷、兴孢噻吩钠、兴孢西丁、噻吩洛酸等十几种新药的前体原料，是国家政策鼓励发展和有自主知识产权的项目。

The crotonaldehyde is produced upon catalysis and condensation with acetic aldehyde as raw materials. It is a major raw material for making sorbic acid.

巴豆醛是以乙醛为原料，经NaOH催化缩合产生，是制造山梨酸的主要原料。

Good linearities were obtained for nine organic acids, and the detection limits were 0.5 mg/L, 0.3 mg/L, 1.5 mg/L, 1.5 mg/L, 0.3 mg/L, 0.3 mg/L, 0.4 mg/L, 0.4 mg/L, 0.4 mg/L for malonic, formic, tartaric, malic, succinic, glutaric, acetic, lactic and glutamic acid, respectively.

cm为分离通道，在6 min内实现了9种酸的完全分离。9种有机酸的浓度与其峰面积在一定的范围呈良好的线性关系，检出限均低于1.5 mg/L，迁移时间和峰面积的日内、日间相对标准偏差均小于6%。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。