共查询到20条相似文献,搜索用时 140 毫秒
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《精细化工原料及中间体》2014,(9)
正本发明涉及到制备N-乙酰乙酰苯胺的方法。该方法具体步骤包括:在0~10℃内向搅拌的去离子水中加入N-乙酰乙酰苯胺晶种和乳化剂进行反应,然后在一定的温度控制下,同时滴加双乙烯酮和苯胺,并保持温度,反应后,冷却至0℃,过滤,烘干得到N-乙酰乙酰苯胺。本发明方法具有有效防止产品结块,提高产品的外观和性能。提高产品收率,并大幅度降低废水量 相似文献
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以3,3'-二氯联苯胺盐酸盐(DCB)和邻甲基乙酰乙酰苯胺(AAOT)为原料,在偶合反应结束后,向制备的C.I.颜料黄14(PY14)水分散液中添加聚乙烯蜡(PEW),考察了PEW添加量、加热温度、加热时间、搅拌转速、pH、PEW粒径对颜料性能的影响。得到较优制备条件为PY14与PEW质量比1.0∶1.0、加热温度80℃、加热时间20 min、40~60目PEW、pH=7.0、转速250 r/min,在该条件下制备出直径为1~2 mm、粒径均一、具有核壳结构和疏水性能的预分散C.I.颜料黄14(预分散颜料PY14)。预分散颜料易于从水相分离,滤饼含水量从PY14颜料的79.29%降低至预分散颜料PY14的59.85%,过滤时间为PY14颜料的1/20;分散过滤值(FPV)从PY14颜料的0.75 MPa/g降低至预分散颜料PY14的0.06 MPa/g;所得颜料不需经过强力粉碎,可抑制粉尘污染的产生;在保持与原颜料相近的色光、饱和度、鲜艳度等颜料性能前提下,提升了颜料的着色力。 相似文献
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利用表面活性剂AS对废料中回收退热冰的脱色研究,测定表面活性剂AS的加入方式、浓度、温度对产品脱色的影响。通过与活性炭脱色的比较,确认表面活性剂AS对回收退热冰脱色的可行性和优点。 相似文献
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采用固相萃取-气相色谱/电子捕获检测法(SPE-GC/ECD)对水样中的几种酰胺类除草剂(含两种三嗪类除草剂)进行了残留量检测.并对实验过程中涉及的一系列条件进行了优化,结果表明:C18小柱经5 mL甲醇-5 mL水活化后,将样品以约4~5 mL/min的速率过柱富集;再用13~15 mL丙酮、以约0.4~0.5 mL/min的速率进行洗脱,洗脱液旋转蒸发浓缩N_2吹除水后用正己烷定容后上机测定,结果良好,符合有机分析要求.仪器的检出限为0.003~0.056 mg/L. 相似文献
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Pengcheng Zou Kai Wang Guangsheng Luo 《Frontiers of Chemical Science and Engineering》2022,16(12):1818
The deacylation of amides, which is widely employed in the pharmaceutical industry, is not a fast reaction under normal conditions. To intensify this reaction, a high-temperature and high-pressure continuous microreaction technology was developed, whose space-time yield was 49.4 times that of traditional batch reactions. Using the deacylation of acetanilide as a model reaction, the effects of the temperature, pressure, reaction time, molar ratio of reactants, and water composition on acetanilide conversion were carefully studied. Based on the rapid heating and cooling capabilities, the kinetics of acetanilide deacylation at high temperatures were investigated to determine the orders of reactants and activation energy. This microreaction technology was further applied to a variety of other amides to understand the influence of substituents and steric hindrance on the deacylation reaction. 相似文献
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环境水中7种酰胺类和磺酰脲类除草剂残留检测方法研究 总被引:2,自引:0,他引:2
本研究建立了能同时测定水中酰胺类除草剂和磺酰脲类除草剂残留量的分析方法。样品分别用正己烷、乙腈对不同类型的残留农药进行提取,然后分别以气相色谱-电子捕获检测器(GC–ECD)和高效液相色谱-紫外检测器(HPLC–UV)进行定性和定量。各种农药在0.05~1.0 mg/L浓度范围内线性关系良好,相关系数为0.9979~0.9999;在0.02~0.5 mg/L添加浓度范围内,平均回收率在76.0%~113.2%之间,相对标准偏差为2.68%~9.12%;最低检出限为0.2~2.0μg/L。实验结果表明本方法简便、快速,定量准确,灵敏度和精密度好,可实现环境水样中痕量酰胺类和磺酰脲类除草剂残留分析的要求。 相似文献
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《Food and cosmetics toxicology》1980,18(4):393-397
The autoradiographic distribution of 14C-aniline hydrochloride was studied in male Fischer 344 rats following iv administration of 3, 30 or 100 mg/kg. The highest initial concentrations of radioactivity associated with 14C-aniline or its metabolites were found in the blood, liver, kidney, bladder and gastro-intestinal tract. At the 100 mg/kg dose, the spleen was the only organ that did not show a time-dependent decrease in radioactivity over 24 hr. After 0·5 and 6 hr, radioactivity was concentrated in the stomach and small intestine but there was comparatively little activity in the colon. Analysis of the stomach and jejunum for aniline and its metabolites using gas chromatography-mass spectroscopy showed that aniline was predominant in the gastric contents (aniline:acetanilide, 7·3:1) and that acetanilide was the principal compound in the jejunal contents (acetanilide:aniline, 15:1). Trace amounts of o- and p-aminophenol and of acetaminophen were also detected. High levels of acetanilide in the small intestine were probably due to the metabolism of aniline in the mucosa of the gut. It was concluded that after iv injection aniline is rapidly concentrated in the stomach but that aniline and acetanilide are reabsorbed in the small intestine, thus completing an enterogastric cycle. Therefore the gastro-intestinal tract appears to be a major site for the metabolism of aniline in the rat. 相似文献
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以乙酰苯胺为原料,乙酸为溶剂,在浓硫酸作用下,合成了未见国内外文献报道的阳离子光引发剂4,4′-二乙酰胺基二苯基碘六氟磷酸盐,其结构经IR,1HNMR,MS和UV确认。通过正交实验确定了最佳合成条件:乙酰苯胺30.6 g(0.227 mol)和碘酸钾22 g(0.103 mol),溶剂乙酸用量为100 mL,室温(25℃)反应24 h,产率可达47.6%。 相似文献
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水中溶解性有机物分子量分布测定方法评价 总被引:12,自引:0,他引:12
文章介绍了两种测定水中有机物分子量分布的方法 :滤膜过滤法及凝胶液相色谱法 ,并列出了一些研究者用两种方法测定水源水的结果 ,根据两种方法的测定原理、测定步骤及对数据的分析 ,作者认为滤膜法应视作为一种粗略的方法 ,有条件时应尽量采用凝胶色谱法 相似文献