共查询到19条相似文献,搜索用时 62 毫秒
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研究了回收苯乙酸的新方法,将含有苯乙酸的废水经过固体化,溶解于甲苯中,然后利用浓硫酸强氧化性除去杂质,氢氧化钠碱化、分离、脱色,再酸化得到纯净苯乙酸。 相似文献
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羰基化法生产苯乙酸工艺中生成的废催化剂,含有大量有价值的钴元素。介绍一种从废催化剂中,采用黄钠铁矾沉淀法将铁除去,用萃取法将锰、钻分离,制备得到含结晶水的氯化钴,钴的回收率达90%以上。 相似文献
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苯乙酸又名苯醋酸、苄基甲酸。工业上,苯乙酸的生产方法主要有氰化钠法、苯乙酰胺法和羰基合成法3种。氰化钠法是苯乙酸的传统生产方法,指的是在常温常压下,氰化钠和氯苄反应生成苯乙腈,苯乙腈再经酸性水解或碱性水解得到苯乙酸。苯乙酰胺法是以苯乙烯为原料,经与氨水、硫磺反应生成苯乙酰胺,再经水解生成苯乙酸。羰基合成法是指在羰基化催化剂作用下及在较低压力(<1.5MPa)下,氯苄在氢氧化钠和有机溶剂两相体系中进行羰基化反应,生成苯乙机化工原料,具有广泛的用途。目前,我国苯乙酸的生产能力约3kt/a。产品主要用作生产青霉素的原料。我国… 相似文献
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介绍了苯乙酸的应用领域,比较了苯乙酸合成的各种工艺技术路线,对最有发展前途的先进工艺(氯苄羰基合成苯乙酸)给予了重点介绍,分析了国内苯乙酸的生产现状。 相似文献
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以钛白生产中的硫酸亚铁和浓废酸为原料,成功制备了工艺污水处理所需的聚合硫酸铁絮凝剂,对影响其絮凝效果的主要因素进行了分析。根据参数的确定进行工艺路线设计及单套年产25 kt聚合硫酸铁项目方案设计。该法具有工艺简单、反应时间短、原料成本低等优点,产品质量达到了工业级的要求。 相似文献
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Emilia Abdulmalek Mahashanon Arumugam Mahiran Basri Mohd Basyaruddin Abdul Rahman 《International journal of molecular sciences》2012,13(10):13140-13149
Herein, an efficient epoxidation of 1-nonene is described. In a simple epoxidation system, commercially available Novozym 435, an immobilized Candida antarctica lipase B, and hydrogen peroxide (H2O2) were utilized to facilitate the in situ oxidation of phenylacetic acid to the corresponding peroxy acid which then reacted with 1-nonene to give 1-nonene oxide with high yield and selectivity. The aliphatic terminal alkene was epoxidised efficiently in chloroform to give an excellent yield (97%–99%) under the optimum reaction conditions, including temperature (35 °C), initial H2O2 concentration (30%), H2O2 amount (4.4 mmol), H2O2 addition rate (one step), acid amount (8.8 mmol), and stirring speed (250 rpm). Interestingly, the enzyme was stable under the single-step addition of H2O2 with a catalytic activity of 190.0 Ug−1. The entire epoxidation process was carried out within 12 h using a conventional water bath shaker. 相似文献
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三氯杀螨醇生产废酸的回收工艺 总被引:1,自引:0,他引:1
叙述了三氯杀螨醇生产过程所产生的废酸的回收处理工艺:采用结晶分离方法将废酸中的对氯苯磺酸提取出来,用作三氯杀螨醇水解过程的催化剂;所余废硫酸再经过水蒸气蒸馏处理使其中三氯乙醛含量降低到一定标准后可用于农肥生产。 相似文献
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Few scientific reports have suggested the possibility of using natural phenolic acids as functional substances, such as stabilizers for polymeric materials. The replacement of commercial stabilizers in the polymer industry can be beneficial to human health and the environment. The aim of this study was to obtain biodegradable composition of polylactide (PLA) and polyhydroxyalkanoate (PHA) with natural amber (succinic) acid. The materials were subjected to controlled thermooxidation and solar aging. The research methodology included thermal analysis, examination of surface energy, mechanical properties and spectrophotometric analysis of the color change after aging. The samples of aliphatic polyesters containing from 1 to 2 parts by weight of succinic acid were characterized by increased resistance to oxidation (DSC analysis). Natural acid, preferably at a concentration of 1–1.5 parts by weight, acted as a stabilizer in the polymer compositions. On the other hand, materials that had amber acid above 2 parts by weight added were more susceptible to oxidation (DSC). They also showed the lowest aging coefficients (K). The addition of acid at 2.5–4 parts by weight caused a pro-oxidative effect and accelerated aging. By adding amber acid to PLA and PHA, it is possible to design their time in service and their overall lifetime. 相似文献
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丹麦托普索WSA湿法制酸工艺可以有效地利用各种生产过程中产生的含硫酸性气体直接制酸,得到商品级浓硫酸,具有适用范围广、工艺流程简单、硫回收率高、操作成本低、经济效益好等特点,是石油、石化、冶金、化肥、发电、焦化、煤化工等行业可供选择的、有竞争力的硫回收工艺路线之一。简要介绍了WSA湿法制酸方法的原理及其工艺流程、技术特点和应用前景。 相似文献