查询词典 p-phthalic acid

Batch and semi-continuous oxidation of p-xylene to terephthalic acid in oxygen-enriched atmosphere with volume fraction of oxygen from 21% to 80% were investigated.

在体积分数为21%~80%的富氧空气中进行对二甲苯的间歇和半连续氧化反应，获得了富氧条件下对二甲苯氧化反应的固相中间产物(对羧基苯甲醛、对甲基苯甲酸)含量的变化规律。

Bis (P—bromobenzylamino) ethane and 1,2—bis (m—Iodobenzylamino) ethane may be prepared by condensation of the corresponding halo benzaldehyde with ethylenediamine and followed by catalytic hydrogenation of the Schiff's bases over Pto_2 in glacial acetic acid solutions: Both Ⅱa and Ⅱb may react in neutral mediam with aldehydes to form well—defined crystalline tetrahydro—imidazole, which may be served as derivatives of identification for aldehydes: Under the same condition, however,Ⅱb may ...

用1，2-二乙烷与二十余种醛类作用，得到有固定熔点的晶体衍生物，它们的熔点分布在85—210℃之间，产率为40—96％，这试剂与甲基酮类在相同条件下无反应，因此，它可作为鉴定醛类的专属试剂。 2。上述衍生物用稀盐酸在室溫处理，能发生水解，可以定量地收回原来的醛，因此这试剂又可作为分离醛类的试剂。 3。上述衍生物可以用非水滴定法半微量地测定其分子量可作为鉴定醛类的另一项参考数据。 4.1，2-二乙烷与醛类能生成晶体衍生物，但这试剂也与甲基酮在同样条件下发生反应，所以不适合作为鉴定醛类的专属试剂。

Flame—retardant resin was prepared by the condensation and polymerization of phosphoric acid, trihydroxy methyl propane and epoxy chloropropane,the resin was then reacted with hexane diacid and diglycol under certain condition ,resulting in polyol containing 1.5% P and 17— 18% polyester polyol, which was foamed with polyisocyanate, water and catalyst by one— step method, producing fire...

通过磷酸、三羟甲基丙烷和环氧氯丙烷的缩合和聚合反应制得阻燃树脂，然后将它与己二酸、一缩二乙二醇在一定条件下反应制得含P1.5%和含Cl17～18%的聚酯多元醇，再将它与多异氰酸酯、水、催化剂等组分采用一步法发泡工艺制得阻燃聚氨酯软泡塑料。

Flame— retardant resin was prepared by the condensation and polymerization of phosphoric acid, trihydroxy methyl propane and epoxy chloropropane,the resin was then reacted with hexane diacid and diglycol under certain condition ,resulting in polyol containing 1.5% P and 17— 18% polyester polyol, which was foamed with polyisocyanate, water and catalyst by one— step method, producing fire—resistant PU soft foam.

通过磷酸、三羟甲基丙烷和环氧氯丙烷的缩合和聚合反应制得阻燃树脂，然后将它与己二酸、一缩二乙二醇在一定条件下反应制得含P1.5%和含Cl17～18%的聚酯多元醇，再将它与多异氰酸酯、水、催化剂等组分采用一步法发泡工艺制得阻燃聚氨酯软泡塑料。

Based on the pot experiments ,effects of Dibutyl phthalatepollution on contents of solubility carbohydrate ,MDA, blade pigment, protein, glutathione and amino acid of Vallisneria s piralisL were s tudied during a long p eriod of 25 days .

在本实验浓度范围内，苦草对邻苯二甲酸二丁酯有一定的适应能力，DBP污染对苦草丙二醛和可溶性糖含量以及叶片中叶绿素含量的影响比较相似都有一定的起伏。

Four phenolic components of p-hydrobenzoic, vanillic, gallic acid and ferulic acids could be detected in soil with different continuous cropping years.

其中棉花秸秆中的酚类化感物质含量高于根系分泌物中的，棉花秸秆地上部酚类化感物质含量高于地下部。

"It is now generally conceded by protein chemists that most functional proteins would be difficult to reach or interconvert through a series of successive individual amino acid mutations"Denton, 1985, p.

&现在蛋白质化学家一般都承认，大多数有功能的蛋白质都难以通过一系列连续的不同氨基酸变异而形成或互换&。

SEM, Raman and PL spectrum were adopted to characterize the surface, structure and photoluminescence property of samples. In comparison with those prepared by anodising p type silicon, the porous silicons prepared by non-acid hydrothermal method have smooth surface, regular shape of pores and higher PL efficiencey.

实验采用扫描电镜、拉曼光谱和光致发光谱对样品表面形貌、结构及发光性能进行表征，并与用常规电化学阳极氧化法制出的多孔硅进行了对比研究，研究结果表明用无酸水热法制出的多孔硅表面平整，孔的形状规则，发光效能提高更多。

SEM, Raman and PL spec trum were adopted to characterize the surface , structure and photoluminescence property of samples. In comparison with those prepared by anodising p type silic on, the porous silicons prepared by non-acid hydrothermal method have smooth su rface , regular shape of pores , and higher PL efficiencey.

实验采用扫描电镜、拉曼光谱和光致发光谱对样品表面形貌、结构及发光性能进行表征，并与用常规电化学阳极氧化法制出的多孔硅进行了对比研究，研究结果表明用无酸水热法制出的多孔硅表面平整，孔的形状规则，发光效能提高更多。

A new monomer,4-hexanoxyl-4′-undecylene-[10]-acyloxyazobenzene was synthesized using the main materials:phenol,underlenic acid,1-bromo- n -hexane, p -nitrophenol,thionyl chloride,by the substitution,reduction,couping and diazotization methods.A new polymer was prepared by hydrosilation reaction of poly (methylhy-drosiloxane) with the monomer.

以苯酚、十一烯酸、正溴己烷、对硝基苯酚和二氯亚砜为主要原料，通过取代、还原、重氮化和偶合等反应，合成了一种新的液晶单体 4-己氧基-4′-十一烯-[10]-酰氧基偶氮苯，并与聚通过硅氢加成生成一种新的高分子液晶。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。