查询词典 para-aminobenzoic acid

Para-Aminosalicylic acid; its salts; its derivatives; their salts; any compound with any substance

falling within this item对氨水杨酸；其盐类；其衍生物；它们的盐类；含有任何属此项范围内的物质的化合物 PP

The leading products of our Company are para cresol, with an annual output of 8,000 tons; food additives, such as potassium sorbate and sorbic acid, with an annual output of sorbic acid and potassium sorbate 10,000 tons, which occupied in the domestic market; Meanwhile, exported to Europe, the United States, Japan, South Korea and other countries and regions, whose volume accounts for 60% of the total, which has made it an important export-oriented enterprises of Dezhou Area, and also, has become the world's production base of para cresol and an important production base of sorbic acid and potassium sorbate domestically .

公司主导产品为医药中间体对甲基苯酚、食品添加剂山梨酸和山梨酸钾等。目前，公司年产对甲基苯酚8000吨，山梨酸和山梨酸钾25000吨，产品在占领国内市场的同时，远销欧、美、日、韩等国家和地区，出口量占销售总量的60%以上，成为德州市重要的出口创汇型企业，并成为全球对甲基苯酚生产的重要基地和国内山梨酸和山梨酸钾重要的生产基地。

A process for reducing nitryl with unstable guanyl on para-position of benzene ring into azyl features that active metal reacts on organic acid and solvent at ordinary temp. and pressure to reduce N-(2 or 3-M, 5 or 6-M',4-nitrophenyl)-N',N'-dimethyl acetamidine into N-(2 or 3-m, 5 or 6-M', 4-aminophenyl)-N',N'-dimethyl acetamidine, where M=H,-R,-OR,-COOR (R=H, C1-C6); and M'=H,-R,-OR,-COOR (R=H, C1-C6). Its advantages include reduced by-reaction and high reducting rate up to 80%-95%.

本发明是将苯环上对位带有不稳定脒基的硝基还原为氨基的方法，采用活泼金属，如：锌或锡，与有机酸和适当的溶剂，在常温、常压下发生反应，将N－（2或3－M，5或6－M＇，4－硝基苯基）－N＇，N＇－二甲基乙脒还原为N－（2或3－M，5或6－M＇，4－氨基苯基）－N＇，N＇－二甲基乙脒，其中M＝H，－R，－OR，－COOR（R＝H，C1－C6），M＇＝H，－R，－OR，－COOR（R＝H，C1－C6），减少了副反应，使还原收率达到80％以上，最高可达95％以上，更适用于工业化生产。

In experimental research, the S-L-E of three groups of isomers was determined by using differential scanning calorimetry , and more than two hundred reliable data were obtained. The isomers include meta-, ortho-, and paradichlorobenzene, meta-, ortho-, and para-dibromobenzene and meta-, ortho-, and para-nitro-benzoic acid.

在实验的研究中，采用差式扫描量热测定了邻、间、对二氯苯，邻、间、对二溴苯及邻、间、对硝基苯甲酸等三组同分异构体物系的固液相平衡关系，共得到二百多个可靠的数据。

Chemical corporations within this region may provide matching chemical products and raw materials such as citric acid, starch sugar, L-lactic acid, nitrochlorobenzene, paranitrophenol sodium salt sodium para-nitro phenolate, pphenylenediamine , sodiumhydroxide, benzene anhydride, carbonic acid propylene grease, polyacrylamide ,2.4- dinitrochlorobenzene, 2.4- dinitrosixchlorin, and sodium cyanide.

区内化工企业可配套提供柠檬酸、淀粉糖、 L —乳酸、硝基氯苯、对硝基酚钠、对苯二胺、烧碱、苯酐、碳酸丙烯脂、聚丙烯酰胺、2.4—二硝基氯化苯、2.4—二硝基6氯、氰化钠等化工产品或原料。

The results showed that the amorphous iron oxide has highly catalytic activity. The intermediate products are pyrocatechin, hydroquinone, benzoquinone and low-grade fatty acid. The mechanism of catalyst oxidation is assumed that the free radical OH attacks benzene cycle at the adjacent position and para-position of OH on phenol so that the benzene cycle is opened and low-grade fatty acid is produced and transformed into CO2 and H2O.

结果表明，非晶铁氧化物催化剂在催化氧化降解苯酚时具有较高的催化活性，苯酚降解的中间产物有：对苯二酚、邻苯二酚、苯醌和低级脂肪酸，其降解机理是羟基自由基攻击苯环上OH的部位或对位而使苯环开环，生成低级脂肪酸，并最终转化成二氧化碳和水，从而使苯酚得以降解。

OH radicals produced by ultrasound in aqueous solution attack phenolic cycle at adjacent or para position of the hydroxyl on phenol so that phenol is changed into small organic molecules such as muconic acid, maleic acid and ethane diacid. These small organic molecules will be oxidized to form carbon dioxide and water by.

苯酚超声降解的作用机理是，超声空化在水溶液中产生的·OH自由基进攻苯酚苯环上羟基的邻位或对位而使苯环断裂生成己二烯酸、顺式丁烯二酸和乙二酸小分子有机物而使苯酚得以降解，这些小分子有机物在·OH自由基的进一步作用下最终被氧化成CO〓和H〓O。

Have been investigated for the first time, obtaining poly , copolymers of para-diethynylbenzere with propargyl alcohol , propiolic acid with ethynylbenzene , propiolic acid with para-diethynylbenzene, and propiolic acid with propargyl alcohol.

制得丙炔酸均聚物，以及对二乙炔苯与丙炔醇，丙炔酸与苯乙炔，丙炔酸与对二乙炔苯，丙炔酸与丙炔醇共聚物。

With excessive nitric acid of different concentrations as the nitrating agent, regiospecific of meso-tetraphenylporphyrin were investigated in detail.

以不同浓度的硝酸为硝化试剂，详细考察了多种因素对meso-四苯基卟啉苯环上para位硝化反应的影响。

Folic acid is Vitamin Bc made up of 2-amino-4-hydroxyl-6-methylpterin, para-amino benzoic acid and glutamic acid, transforming into tetrahydro-folic acid in the human body, the ones that participated in formatting amino acid and nucleic acid.

中文摘要：叶酸系由2-氨基-4-羟基-6-甲基蝶呤、对氨基苯甲酸及谷氨酸组成的水溶性B 族维生素，在人体内转化成四氢叶酸，参与氨基酸及核酸的合成。

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。