查询词典 citric acid

The present invention adopts the technical proposal of adopting ZSM-5 mesoporous molecular sieve raw powder with a silicon-aluminum mol ratio SiO2Al2O3 of 20 to 1000 and a weight percentage of 20 to 100 percent as well as at least one caking agent selected from SiO2, clay and Al2O3 to extrude, tablet or spray into shape; then treating for 1 to 8 hours by 0.1 to 3 mol/l of at least one ammonium liquor from ammonium nitrate, ammonium chloride or ammonium sulphate or 0.1 to 8.5 mol/l of at least one acid liquor from muriatic acid, nitric acid, vitriol or acetic acid under a temperature of 20 to 90 DEG C; then using steam to treat for 2 to 15 hours under the temperature condition of 400 to 700 DEG C; using a liquor of 0.1 to 3mol/l selected from at least one of oxalic acid, citric acid or maleic acid under a temperature condition of 20 to 90 DEG C to dip for 2 to 5 hours to obtain the modified molecular sieve catalyst, thus better solving the problems.

本发明通过采用硅铝比SiO2/Al2O3为20～1000重量百分比计20～100％的ZSM-5介孔分子筛原粉与余量的选自SiO2、粘土或Al2O3中至少一种粘结剂挤条、压片或喷球成型；再经过0.1～3摩尔/升选自硝酸铵、氯化铵或硫酸铵中的至少一种铵溶液或0.1～8.5摩尔/升选自盐酸、硝酸、硫酸或乙酸中的至少一种酸溶液在温度20～90℃下处理1～8小时；然后在温度为400～700℃条件下水蒸汽处理2～15小时；再用0.1～3摩尔/升选自草酸、柠檬酸或马来酸中至少一种在温度为20～90℃条件下浸渍2～5小时得所需改性分子筛催化剂的技术方案较好地解决了该问题，可用于甲醇转化制丙烯的工业生产中。

The Antioxidization of ascorbic acid ,malic acid,tartaric acid,citric acid,p bromomandelic acid,aminoacetic acid and nitrilotriacetic acid for lard was studied.

研究了抗坏血酸、苹果酸、酒石酸、柠檬酸、对溴苦杏仁酸、氨基乙酸、氨三酸等七种有机酸对猪油的抗氧化作用。

M treatment materials, and also tartaric acid and no maleic acid detected in G. v treatment materials. Inoculation also increased the content of organic acid secretion (increased by 19.80～56.87 mg/kg) of trifoliate root, and the application of AlPO4 greatly increased organic acid content (increased by 20.06～21.84 mg/kg); uninoculated plant root secreted a bit of organic acid; Mycorrhizal poncirus trifoliata seedlings excreted malic acid (42.87%), citric acid (39.22%) and oxalic acid (12.06%).

接种AM真菌的根系分泌的有机酸种类与对照有所不同，未接种处理枳分泌的有机酸有草酸、苹果酸、乳酸、乙酸、顺丁烯二酸和柠檬酸等6种，而接种G.m的则检测到草酸、酒石酸、苹果酸、乳酸、乙酸、柠檬酸、丁二酸等7种，G.v处理的检测到酒石酸，接种处理均未检测到顺丁烯二酸；接种丛枝菌根真菌增加了枳根系分泌有机酸的量比未接种处理增加19.80～56.87 mg/kg，且施用AlPO4后有机酸含量显著增加(增加20.06～21.84 mg/kg；未接种植株根系仅分泌少量有机酸；接种植株根系分泌的有机酸以苹果酸(42.87%)、柠檬酸(39.22%)和草酸(12.06%)为主。

High performance liquid chromatographyanalysis showed the mango fruit of these two cultivars contained 3 carbohydrates, 11 organic acids and 4 carotenoids. The carbohydrates were composed of fructose, glucose and sucrose; the organic acids were oxalic acid, tartaric acid, quinin acid, malic acid, ascorbic acid, lactic acid,α-ketoglutaric acid, citric acid, fumaric acid, succinic acid and gallic acid; the carotenoids were violaxanthin,β-carotene, lutein, lycopene.

高效液相色谱分析表明，芒果果实共含3种糖、11种有机酸和4种类胡萝卜素，即果糖、葡萄糖和蔗糖；草酸、酒石酸、奎尼酸、苹果酸、抗坏血酸、乳酸、α-酮戊二酸、柠檬酸、富马酸、琥珀酸和没食子酸；堇菜黄素、β-胡萝卜素、叶黄素和番茄红素。

Similarly, extrudate containing gum and citric acid exhibited increased solubility and swelling due to increased hydrolysis by citric acid which resulted in open structure that allowed rapid water penetration, swelling and solubility.

类似的，含有胶和柠檬酸的挤出物具有较好的溶胀性和溶解性也归因于柠檬酸的水作用，这种水解作用导致了结构的松散使水能很快渗透从而溶胀和溶解。

He optimum amount of TBHQ is 150mg/kg. The Citric acid and Vitamin C are the synergists of TBHQ. It shows that the effect of Citric acid is more satisfactory.

BHQ的最适添加剂量为150mg/kg，柠檬酸和维生素C对TBHQ表现出良好的增效作用，且柠檬酸的效果优于维生素C。

The optimum amount of Tea Polyphenols is 200mg/kg. The Citric acid and Vitamin C are the synergists of Tea Polyphenols. The experiment result shows that the effect of Vitamin C is better than Citric acid.

在苦杏仁油中茶多酚的最适添加量为200mg/kg，柠檬酸和维生素C对茶多酚表现出一定的增效作用，且维生素C的效果优于柠檬酸。

Based the optimized batch-fermentation condition, it was confirmed that the DE of cassavahydrolysate in the fed batch culture was 80, 4%(NH4)2SO4, adding fed batch culture four times 36hours after the fermentation beginning, and 1.5 hours of fed interval, were the optimized fed-batchfermentation conditions, by studying the culture composition, method, original time and interval offed batch, and some main parameters of the citric acid fermentation, such as citric acid yield, invertrate, fermentation periods and residual glucose.

在批式发酵优化条件的基础上，通过对补料液的组成、补料方式、流加起始时间、流加间隔时间等对柠檬酸发酵过程的主要参数，如产酸率、转化率、发酵周期、残糖等的影响进行了研究，确定了柠檬酸补料发酵的优化条件，即：补料液中木薯糖化液的DE值为80，加入0.04%(NH4)2SO4；发酵36h小时开始分四次流加补料液，流加的间隙时间为1.5小时。

The optimum parameters of chemical passivation in citric acid solution were 4%citric acid, 65°C, 15min, and the time of re-treat in 50%HNO_3 was 11min.

硝酸电化学钝化的较优工艺为：硝酸浓度10％，800mV恒电位阳极极化，25℃左右，时间15min；柠檬酸化学钝化的较优工艺为：柠檬酸浓度4％，温度65℃，钝化时间15min，浓硝酸后处理11min。

Company products are mainly involved in polyurethane, PVC, resin, paint, plastics, pharmaceuticals and other industries, the main oxidation products of alkyl tin, tributyltin chloride, tin dilaurate, citric acid esters, their production capacity for the oxidation of alkyl tin 50T / month, tributyltin chloride 30T / month, tin dilaurate 30T / month, citric acid ester 100T / month.

公司产品主要涉及聚氨酯、PVC、树脂、涂料、塑料、医药等行业，主要产品有氧化烷基锡、氯化丁基锡、月桂酸锡、柠檬酸酯等，其生产能力为氧化烷基锡50T/月、氯化丁基锡30T/月、月桂酸锡30T/月、柠檬酸酯100T/月。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。