uggs kopen Nitrosaicylaldehyde Preparation _1944

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Preparation nitrosaicylaldehyde

At 60 ℃ feeding amount of salt to 4 laugh every time, theoretical yield is 3.5.3g Table 5 acetic acid conversion of the amount of acetic acid on the gross amount of times the management Education 12141.6j. 8l2. Nitro aldehyde l of the most productive (g) 46.047.351.253.0I54Al bad of yield (increase: 36.8892966100l98.9 nitro aldehyde production fgj30.23Ilo352; 35.0Bl into closed prison (%) 85688.o96 .399.7 I99.2 5 can be dried out by the Yuan,[link widoczny dla zalogowanych], when induced into a theoretical amount of acetic acid consumption is about 18 times the 3.5 nitrosaicylaldehyde appropriate qualitative detection of the nitro aldehyde A and B in the I-nitro-aldehyde (XI ℃ temperature drying,[link widoczny dla zalogowanych], constant weight,[link widoczny dla zalogowanych], were determined by melting point and infrared spectrum results for the melting point of the former 125.5 <CCHO on, () H a 126 ~ C, infrared spectrum consistent with the fT; after the mantle by the melting point of 109 ~ C for a 110%, IR and CHO induced visible. salicylaldehyde in this process by nitration and nitration product separation, the two are nitrosaicylaldehyde isomers that 5 nitro salicylaldehyde salicylaldehyde and 3-nitro. 3.6 expansion card based on small pilot test to determine the optimum conditions to expand the test preparation. pounds of alkali into the reaction and are in the 100 liter reactor were . salicylaldehyde feeding amount is IIkg test results are listed in Table 6 Table 6 Preparation of test results expand production capacity temporarily name the amount of potassium (k producing things (%) Remarks can be seen from Table 6, test results and the small scale expansion of the basic match. 4 Conclusion 4.1 The study established the optimum conditions are: in the nitrification process, the Li River fuming nitric acid plus temperature should be controlled in Africa .-. L-hydroxyphenylglycine technological advances j, eleven rf Zhi Wang Jingping VERIS (Shijiazhuang Chemical O5O03I) (a thermoelectric plant in Shijiazhuang City, 050091) summarizes the L p-Gly Lian round progress. L word t fall off the stem volume of Triple Triple Triple Ji Gai stated -71 L usually written on the D-hydroxyphenylglycine (a) A One-hydroxyphenylglycine. full name is D-(a) a a a a a a pair of hydroxy amino acid called L-1 or a pair of one amino-hydroxyphenyl acetic acid. Chemical structure for the Ho_ a c | Bu c0oH. its appearance is white 'one f-color crystal powder. Assay ≥ gill .5%. than the rotation one by one for a 155 ℃ 161 ℃, loss on drying ≤ 0.3%. Synthesis of L-hydroxyphenylglycine is hydroxyl Anbianqingmei Faso, cefadroxil, cefoperazone, ceftazidime Roach and essential drugs such as cephalosporin yl hydroxylamine inverted chain acid. because of its wide use and both the synthesis of pharmaceutical products injection can be administered orally, the clinical effective than ampicillin. So a larger amount of the pharmaceutical market at home and abroad, promising broad. 2 bearing in mind that domestic and foreign consumption profiles of foreign production, L-hydroxyphenylglycine 70 approved 7.r, 7. , inside and outside the city Houle profile, lack of production process split the amount of production buildings. According to foreign reports, the United States and Europe and Japan, in recent years, demand of more than tons. major Japanese technology company producing chemical, Netherlands and Spain, South Korea, Sweden, India and other countries. home. L-hydroxyphenylglycine 80's development, but the product compared with L-phenyl glycine. technical difficulties, process route length, high technical requirements. low yield, high cost, focusing on the split off in the process, however, has not yet formed a large-scale domestic production, are major producers of chemical factories in Shanghai Xu Hangzhou, Zhejiang Hengdian Organic Chemical Industry Group Corporation, Shijiazhuang City Hongyuan Pharmaceutical, Zhangjiakou Xuanhua chemical plant, Shanxi Orchid Biotechnology Co., Ltd., for different technology. are in the pilot stage of Yin. 90 mid-half of all domestic enterprises and Anti antibiotics and cephalosporins products have passed the test, particularly amoxicillin have been transferred to production. such as North China Pharmaceutical, Hebei Pharmaceutical, Mountain West Main Trudeau resistance and Shanghai Pharmaceutical, Sichuan Pharmaceutical, 16 ℃ below. nitric acid dosage 3 times the theoretical amount of: base conversion process, the transition temperature of about 85 ℃, the ratio to 1:7 -1:8 appropriate, alkaline mother liquor amount of salt applied to increase the total yield of aldehydes; re-crystallization process, the ratio to 1:45 is appropriate: acidification process, the reaction temperature at a comfortable 60 ℃ ℃, the amount of acetic acid 1.8 times the theoretical amount. 4.2 technology available nitrosaicylaldehyde two isomers. that is, 5-nitro-salicylaldehyde and 3 for a one nitrosaicylaldehyde. according to their aldehyde different water-soluble salt. by alkali and hot water into the recrystallization can be separated successfully purified. in which the former accounts for about 70%. nitro aldehydes up to 70% overall yield. Reference Man He 1.EBIIighq . dhlmm.19% .2420-2) 2c.Acre.1.1989.17 (2) .271 --- Shuai
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