查询词典 acid process

Up to day, the batch process of producing chloroacetic acid is still extensively used in our country, by which byproduct dichloroacetic acid comes out while chloroacetic acid beingproduced.

控制反应体系中氯乙酸含量不超过30%，最终所得产品氯乙酸含量达98.5%，二氯乙酸含量小于0.5%，以目前实验装置24小时可得氯乙酸2.938kg。

The new process for preparing 4,4"-Diaminostilbene-2,2"-disulfonic acid was characterized by carrying out the catalytic hydrogenation of 4,4"-dinitrostilbene-2,2"-disulfonic acid or its alkali salts in presence of both Pd/C and OVN in water, the amount of OVN ranging from 0.1 to 0.2% by weight of 4,4"-dinitrostilbene-2,2"-disulfonic acid or its alkali salts, yielding 98.7% of desired product with 99.3% purity.

确定了氧化缩合反应的较佳工艺条件，DNS收率达95.2％，纯度达到了99.1％。而在本论文所确定的还原反应最佳条件下，DSD酸的收率可达98.7％，纯度高达99.5％。

Glycerolgenesis. Organic acids was mainly produced during growth phase, acetic acid was the highest, about 1. 6g/L. When the amount of acetic acid and α-Keto glutaric acid was increased slightly and others decreased a bit in 〓 process. The kinds and amount of arganic acide during microbial glycerol production in C.

有机酸主要是菌体生长过程产生的，在酵母生长达平衡期时乙酸积累达最高值1.6g/L，乳酸、丙酮酸、酮戊二酸、苹果酸也都达较高浓度，此时相应的pH降低至最低，随着发酵进行其中乙酸和酮戊二酸略有增加，而其它有机酸是减少的。

As the chitosan is an alkaline polyose, it can be degradated in conjuction with polylactic acid and can suppress that polylactic acid generates pH pulses on environment in degradation process, increasing the cell affinity of the surface of polylactic acid material.

由于壳聚糖是一种碱性多糖，它与聚乳酸同时降解，还可以对聚乳酸降解过程中对环境产生pH脉冲作用起到抑制作用，提高了聚乳酸材料表面的细胞亲和性。

The glycyrrhizic acid antigen is prepared through the process including following steps: dissolving glycyrrhizic acid in N, N-dimethyl formamide, dioxane or dimethyl sulfoxide, heliophobically adding N-hydroxy succinimide, reacting with dicyclohexylcarbodiimide at 0-10 deg.c for 2-5 hr; and reacting with carrier protein at normal temperature for 4-6 hr to obtain glycyrrhizic acid antigen.

本发明所提供的甘草酸抗体，是用甘草酸抗原免疫动物，然后从被免疫动物的血清中分离得到的；所述甘草酸抗原按如下过程制备：先将甘草酸溶解在N，N-二甲基甲酰胺、二氧六环或二甲基亚砜中，避光加入N-羟基琥珀酰亚胺，然后在0-10℃条件下与二环己基碳二亚胺反应2-5小时；接着与载体蛋白常温反应4-6小时，得到甘草酸抗原。

Preparation of trifluoroacetaldehyde and trifluoroacetic acid by trifluoroethanol catalytic oxidation;2. Polyester nanofiber can be prepared by electrospinning process from PET chips separately dissolving in three kinds of solvents,namely,the mixture solvent of phenol and tetrachloroethane, trifluoroacetic acid and the mixture solvent of trifluoroace- tic acid and dichlormethane.

利用静电纺丝法制备聚酯纳米纤维，选择苯酚和四氯乙烷，三氟乙酸，三氟乙酸和二氯甲烷3种溶剂分别溶解PET切片进行静电纺丝，通过扫描电子显微镜对纤维表面形态进行观察，结果表明：三氟乙酸和二氯甲烷混合溶剂溶解PET制备的电纺纤维较好。

Were analyzed under different nutritional levels. The results showed that in tuber development, under-or over-supply of nutrients reduced Zeatin content at initial stage and indole actic acid, abscisic acid and jasmonic acid content at middle stage, but increased gibberellins content in the whole process, which caused GA/ABA and GA/JA to be off balance in the key stage of tuberization.

结果表明，过低、过高的营养供给，降低了块茎发育前期细胞分裂素的含量，中期细胞生长素的含量以及促进块茎发育的脱落酸、茉莉酸含量，增加了各时期促进匍匐茎发生的赤霉素含量，导致在块茎形成和膨大的关键时期，GA/ABA和GA/JA比值失衡，抑制了块茎的正常发育。

Then gel filtration, positive ion resin absorption and isoelectric deposition were applied for polysialic acid purification process. The purity of polysialic acid was above 90 % with neutralisation deposition method and the recovery yield of polysiac acid was 55.8%.

探讨了凝胶过滤法、阳离子树脂吸附法、中和沉淀法进一步纯化聚唾液酸的工艺，其中中和沉淀法可使聚唾液酸纯度达到91.5%，回收率为55.8%。

Finally, industrial policy for sulfuric acid industry in China is given: using reasonably both international and domestic sulfuric sources; developing vigorously and steadily the process of sulfuric acid production from sulfur; enhancing recovery and utilization of effluent gases from non-ferrous metal smeltery and combination sulfuric sources with non-ferrous metal mine; maintaining production capacity and output with iron pyrite as raw material; strengthening home-built work for large-scale sulfuric acid plant.

最后阐述我国硫酸工业的产业政策：合理利用国际，国内两种资源，积极稳妥地发展硫磺制酸；加强冶炼烟气制酸和有色金属伴生硫资源的回收和利用；稳定硫铁矿制酸能力和产量；加强大型硫酸装置国产化工作。

The synthesis process of silica using waterglass and sulpHuric acid as materials was studied systematicly. The results show that reacting temperature, reacting time, sulphuric acid concentration, reactive stiring rate, modulus of waterglass,adding salting agent,alkali concentration,the total volume of acid and alkali added , different methods of adding materials may have influence on the specific surface area or dibutylphthalate absorption number of silica in different degree.

本文系统地研究了以水玻璃溶液和硫酸为原料合成沉淀法白炭黑的工艺，研究发现：反应温度、反应时间、硫酸浓度、反应搅拌速度、水玻璃模数、添加盐析剂、底碱浓度、酸碱加入的总量、加料方式对白炭黑的比表面积或DBP吸收值有不同程度的影响。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。