酐

Three alicyclic dianhydrides, 1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2,4,5-cyclopentanetetracarboxylic dianhydride, and 1,2, 4, 5-cydohexane tetracarboxylic dianhydride were polymerized with two aromatic diamines, 1,4-bis (4-amino-2-trifluoromethylphenoxy) benzene (6FAPB, a) and 4, 4'-bis(4-amino-2-trifluoromethyl phenoxy) biphenyl (6FBAB, b) respectively, via a two-step polycondensation procedure to afford two series of fluorinated semi-alicyclic polyimides.

分别将脂环族二酐单体1，2，3，4-环丁烷四酸二酐、1，2，4，5-环戊烷四酸二酐和1，2，4，5-环己烷四酸二酐与芳香族含氟二胺1，4-双（4-胺基-2-三氟甲基苯氧基）苯(6FAPB， a)和4，4'-双（4-胺基-2-三氟甲基苯氧基）联苯(6FBAB， b)反应制备两个系列的含氟半脂环族聚酰亚胺，研究了PI薄膜的热性能和光学性能。

OBJECTIVES: To predict duration of azotemia and distinguish acute renal failure clinically from chronic renal failure by measuring the concentration of hair creatinine and analysing the correlation between Hcr and serum creatinine in 59 patients with acute renal failure and 64 patients with chronic renal failure .

目的：通过对59例急性肾功能衰竭(Acute renal failure，ARF)病人和64例慢性肾功能衰竭(Chronic renal failure，CRF)病人头发肌酐含量(Hair creatinine concentration，Hcr)测定、比较ARF组和CRF组病人就诊时30-40mm段头发肌酐含量之间的差别、对Hcr与血肌酐浓度(Serum creatinine，Scr)相关关系的研究，在临床上利用头发肌酐含量测定来判定肾功能衰竭持续的时间，进一步鉴别急、慢性肾功能衰竭。

Maleic Anhydride is important organic raw material and the third biggest acid anhydride next to benzene anhydride and acid anhydride. In recent years, Maleic Anhydride is esterified and hydrogenised under pressure to make 1,4- butanediol butylene glycol, and it is also hydrogenised to tetrahydrofuran, which enables Maleic Anhydride to become the raw material for producing high-value-added products and to be more widely applied.

顺酐是重要的基本有机原料，也是世界上仅次于酸酐和苯酐的第三大酸酐，近年来，顺酐脂化低压加氢制1.4-丁二醇和顺酐加氢制四氢呋喃技术的开发成功，是顺酐成为生产高附加值产品的原料，应用领域有了更进一步的拓展。

A series of fluorenyl cardo polyimides were prepared by "one step" polycondensation of these cardo diamines with the dianhydrides4,4\'-oxydiphthalic anhydride(ODPA,3,3\'4,4\'-benzophenonetetracarboxylic dianhydride, 3,3\',4,4\'-biphenyl tetracarboylic dianhydrideand pyromellitic dianhydriderespectively.

由五种Cardo型二胺单体分别与3，3\'，4，4\'-二苯醚四酸二酐、3，3\'，4，4\'-二苯甲酮四酸二酐、3，3\'，4，4\'-联苯四酸二酐和均苯四甲酸二酐采用一步法溶液聚合制备了一系列芴基Cardo型可溶性聚酰亚胺。

The invention relates to polyimide molding powder with low melt viscosity and a preparation method, which uses 3,4'- diamino diphenyl ether, 3,3',4,4'-diphenyl ketone dicarboxylic anhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, 3,3',4,4'- triphenyl diether dicarboxylic anhydride, 3,3',4,4'- diphenyl ether dicarboxylic anhydride and other monomers to polymerize at 100 to 140 DEG C, to get molding powder with a melt viscosity in the range of 1000Pa.s to 5000Pa.s.

本发明属于一种低熔体粘度聚酰亚胺模塑粉及制备方法，是采用3，4′-二氨基二苯醚同3，3′，4，4′-二苯酮四酸二酐、3，3′，4，4′-联苯四酸二酐、3，3′，4，4′-三苯二醚四酸二酐、3，3′，4，4′-二苯醚四酸二酐等单体在100～140℃聚合，获得熔体粘度在1000Pa.s～5000Pa.s范围内的模塑粉。

The process and condition in the preparation of dextran through the fermentation of Leuconostoc mesenteriodes 0326 were discussed in the paper.The adhesive viscosity,pH value, the production of fructose and dextran,variation of molecular weight and the fermentation inducer were investigated,and the related curves of the dextran fermentation presented.

文章对由肠膜状明串珠菌L.M0326发酵生产右旋糖酐的工艺过程及条件进行了探讨，通过对其发酵过程中的粘度、pH值、果糖、右旋糖酐生成和分子量变化的研究及对发酵诱导物的考察，得到了右旋糖酐发酵工艺的相关工程曲线。

Recovery of maleic anhydride using nonaqueous agent is the direction of MA production.

非水溶剂法吸收顺丁烯二酸酐是顺酐生产的发展方向，为开发非水溶剂吸收顺酐的工艺，本文进行了顺酐在有机溶剂中的溶解度。。。

Cis-butendioic anhydride, benzoic acid and phthalide in light fraction column T201 were removed on the column top, the overhead component: benezene anhydride 25.74%, cis-butendioic anhydride 39.11%, benzoic acid 25.37%, phthalide 9.78%.

轻组分塔T201中顺酐、苯甲酸、苯酞都在塔顶被除去，其中塔顶组成：苯酐25.74%，顺酐39.11%，苯甲酸25.37%，苯酞9.78%。

Tgs are about 573 K for copolyimides based on pyromellitic dianhydride and 533—543 K for those based on 3,3′,4,4′-diphenylethertetra-carboxylic dianhydride and are almost independent of the chromophore loading level.

以刚性相对较大的均苯四甲酸二酐为二酐单体的PPI 的Tg在573 K左右；以二苯醚-3，3′，4，4′-四甲酸二酐为单体的OPI 的Tg在533～543 K之间，且基本与染料发色团含量无关。

It is pointed out that developing of maleic anhydride using the butane source of Luoyang Petrochemical Branch Company can not only enhance the added value of liquified petroleum gas,but also change the present situation of no maleic anhydride installment in the Yellow River area,promote the fine chemical developme.

介绍了顺酐的主要生产方法和技术进展，分析了我国顺酐工业的生产现状、消费情况，提出用洛阳石化分公司现有的正丁烷资源开发顺酐产品，既能提高液化石油气的附加值，又可以改变中原地区没有大型顺酐装置的现状，促进中部精细化工的发展，具有显著的经济效益和社会效益。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。