查询词典 chlorination

Vanadium pentoxide by chlorination and activated carbon mixture preparation.

由五氧化二钒和活性炭混合物氯化制取。

This complex reaction was phenolic electronic substitution reaction, so reaction rate was related with the positive electricity of pro-electronic reagent, as well as the form of aromatic hydrocarbons. Rates of chlorination of phenol and 2-monochlorophenol were faster in alkaline water than that in weak acid water, so 2,4-dichlorophenol and 2,4,6-trichlorophenol formation concentrations increased with the reaction time.

该复合反应属于酚类电子取代反应，反应速率与亲电子试剂的阳电性以及芳香烃的形式有关，碱性水环境中氯取代苯酚和2-一氯酚的速率要快于在弱酸性水环境；随着pH的升高，2，4-DCP和2，4，6-TCP的生成浓度也不断增加。

Although the haloform reaction is precedented in the pedago-gical literature (3d), this experiment differs because it is is-covery-oriented and it includes a new reaction for the teaching lab, aromatic chlorination.

尽管在专业文献上氯仿反应多有报导（3d），这个实验更重视实际发现，并为教学实验介绍了一种新的芳香氯代反应。

In this paper, the innovative improvement of the cyclization and chlorination of quinoxaline was: 1. DHQX was prepared via reactingο-phenylenediamine with ethyl- oxalate in hydrochloric acid, the mixture was stired at 75-80℃for 2h.

本文对喹喔啉环合和氯代反应作了一些革新性的改进： 1、在环合合成DHQX时：以盐酸溶液为介质，邻苯二胺和草酸二乙酯在75-80℃进行环合反应约2h，即可得产物。

Methods Using 4-chloro-2-nitroaniline as a starting compound, followed by substitution, reductive cyclization, oxidation, and chlorination, to give the key intermediate 2,7-dichloroquinoxaline (7), which reacted with different phenolic compounds to afford quinoxaline derivatives.

方法以4氯2硝基苯胺为起始原料经取代、还原关环、氧化、和氯代合成了中间体2，7二氯喹喔啉(7)，再在喹喔啉的2位引入不同的取代酚结构单元，合成了一系列共9个新喹喔啉衍生物。

We focused the study on the synthesis methods of quinoxaline, nitration of its aromatic ring and chlorination of its heterocycle. In this paper, we thought about environmental protection, the cost of material, the feasibility of industrialization, workup easily, and obtained 2,3(1H,4H)-quinoxalinedion, 6-nitro-2,3(1H,4H)-quinoxalinedion, 6,7-dinitro-2,3(1H,4H)–quinoxalinedion, 2,3-dichlo- roquinoxaline, 6–nitro-2,3-dichloroquinoxaline,and 6,7- initro-2,3-dichloro-quinoxaline. A more reasonable, easily, efficient and simple reactive route to synthesize above-mentioned compounds was developed by systematically investigating the yield, the purity and physical character of intermediates.

本文针对喹喔啉及其芳环硝化、杂环氯代的合成进行研究，主要考虑了环保性、原料成本、产业化的可行性、反应操作的简便性等问题，获得了2，3(1H，4H)-喹喔啉二酮、6-硝基-2，3(1H，4H)-喹喔啉二酮、6，7-二硝基-2，3(1H，4H)-喹喔啉二酮、2，3-二氯喹喔啉、6-硝基-2，3-二氯喹喔啉和6，7-二硝基-2，3-二氯喹喔啉等六个中间体，考察了反应产物的产率、纯度和性状等因素，得到了更为合理、方便、实用、简洁的可供产业化的合成路线。

A craft research was introduced which used the low-grade rhodochrosite and the industry waste hydrochloric acids as the raw material to make the chlorination manganese,Through the study of the leaching process theory and the experiment,each kinds of factor influencing the manganese leaching rate and the product quality was discussed so as to obtain the optimal craft conditions.

介绍了以工业废盐酸和低品位菱锰矿为原料制取氯化锰的工艺研究。通过对酸浸过程的理论与试验研究，讨论了各种因素对锰浸出率及产品质量的影响，得出最佳工艺条件。

Chlorination manganese ; hydrochloric acid ; rhodochrosite ; leaching

氯化锰；盐酸；菱锰矿；浸出

The results show that the E WOOL process is a new shrinkproof technique of wool excluded chlorination and resin used for covering fiber.

对E WOOL的处理技术特点和产品性能进行了研究，结果表明，E WOOL是完全不使用氯气及氯化合物，不覆盖树脂进行加工的羊毛防缩新技术。

High-purity strontium carbonate, six water strontium chloride, nitrate strontium, strontium hydroxide, acetic acid strontium, strontium fluoride, hydrogen phosphate strontium, strontium peroxide, high-purity barium carbonate, barium acetate, high-purity hydrogen and oxygen in water 8 Barium, industrial-grade eight water barium hydroxide, barium peroxide, four water chlorination products such as the annual output of manganese 8,000 tons.

高纯碳酸锶，六水氯化锶，硝酸锶，氢氧化锶，醋酸锶，氟化锶，磷酸氢锶，过氧化锶，高纯碳酸钡，醋酸钡，高纯八水氢氧化钡，工业级八水氢氧化钡，过氧化钡，四水氯化锰等产品年产量8000吨。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。