查询词典 p-phthalic acid

The synthesis of 1,4 dioxane from diethylene glycol using p toluene sulphonic acid as a catalyst was discussed.

利用二甘醇为原料，以对甲苯磺酸为催化剂合成了 1 ，4 -二氧六环。

The conventional process for the synthesis of rubber antioxidant 4020 from the 4-anino diphenylamine and methyl isobutyl ketone under high pressure can be replaced by a new three-step process using p -aminophenol, methyl-isobutyl ketone, formic acid and aniline as raw materials.

以橡胶防老剂4020合成新工艺小试条件为依据，完成了放大试验过程的工艺研究，改变了传统的在高压下以较大分子为原料合成橡胶防老剂4020的工艺路线。

Then SAM precipitation was carried out by picric acid and SAM precipitated is higher than 90％. After butanone extraction, acetone precipitation and SAM sulfate or SAM double salt of sulfate and p-tosylate formation, the stable SAM salt was obtained.

结果表明，苦味酸是一种选择性较好的沉淀剂，沉淀步骤得率在90％以上，制备SAM的硫酸盐的总得率在60％以上，而硫酸对甲苯磺酸双盐的得率在50％以上，产物的纯度达到了95％以上，已经达到了国外同类产品的质量指标。

Agent TJ-201 is an organic phosphonocarboxylic acid containing maleic group, p hosphonic group, and ethoxyl group etc.

TJ-201是一种含马来酸基、磷酸亚基、氧乙烯基等的膦基聚羧酸。

ABSTRACT Agent TJ-201 is an organic phosphonocarboxylic acid containing maleic group, p hosphonic group, and ethoxyl group etc.

摘 要 TJ-201是一种含马来酸基、磷酸亚基、氧乙烯基等的膦基聚羧酸。

It was found that citrate, tartaric acid and oxalate exudation increased as adaption to P deficiency.

结果表明柠檬酸、酒石酸和草酸分泌量的增加是甘蓝型油菜对缺磷胁迫的适应性机制。

After the ferromolybdenum was dissolved completely in nitric acid at low temperature,adding internal standard elements of ~(45)Sc,by use of internal elements calibrated method,the content of Sb,Cu,Sn,Si and P in ferromolybdenum is determined directly by ICP-MS.

将钼铁样品用HNO3低温溶解完全后，加入内标元素45Sc，采用内标法，用ICP-MS仪进行测定。文中讨论了基体钼对测定的影响。本方法的加标回收率为98.0%~102.5%，相对标准偏差RSD为1.6%~3.5%。本方法具有简便、快速、准确等特点，可用于钼铁样品中微量杂质元素的分析

Huaying is engaged in production and supply of phosphoric acid, phosphogypsum and sodium fluosilicate, and made great progress in operation in 10 years. The company is developing the production and market of its downstream product MAP and expanding its P.A export business.

主要从事磷酸，石膏、氟硅酸钠等磷化工系列产品的销售生产业务，公司成立十年来生产经营取得了较快发展，目前正在拓展磷酸后续加工产品——磷铵生产、销售及磷酸出口业务。

Huaying is engaged in production supply of phosphic acid, phosphogypsum sodium fluosilicate, made great progress in operation in 10 years. The company is developing the production market of its downstream product MAP exping its P.A expt business.

主要从事磷酸，石膏、氟硅酸钠等磷化工系列产品的销售生产业务，公司成立十年来生产经营取得了较快发展，目前正在拓展磷酸后续加工产品——磷铵生产、销售及磷酸出口业务。

In this paper, the dilute acid pre-treatment conditions, the detoxification methods, and the research progress in ethanol production from hemicellulose dilute hydrolyzate by P.

综述了稀酸预处理条件、脱毒方法和树干毕赤酵母发酵水解液生产乙醇的国内外研究进展。

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。