查询词典 acid process

In this thesis, we describe a facile and economical synthesis of-abscisic acid from keto-isophorone and 3-butyn-2-ol through ketalization, oxidization, Witting-Horner reaction, reduction with chromium sulfate and other steps in 13% total yields. Compared to the previous routes, the starting materials are more commercially available and cheaper and the synthetic process is more easily controlled in our method, but the yield of this route is still to be improved.As to isostere principle, cyclopropyl and methyl vinyl are a couple of isostere.

本论文设计并完成了一条全新的外消旋脱落酸(1)全合成路线，从廉价的工业原料氧化异佛尔酮和丁炔醇出发，经过缩酮化反应、氧化反应、Wittig-Horner反应、CrSO_4选择性还原反应以及水解等七步反应实现了脱落酸的全合成，总产率达13％，与以往路线相比，该路线所用试剂廉价、合成路线简单，但产率有待提高。

In this study, an index evaluation system of itaconic acid was established according to the current situation of IA and the correlative laws in China. For the first time, a complete research on the IA production from this point of view was carried out, finding out the problems in the process of IA production, and then the project was advanced. All the research were begun with the data from laboratory and escalated to the industry scale. During the past three years, some of the work were applied successfully to industry.

根据现有衣康酸生产的现状和我国清洁生产相关的法律法规，建立了衣康酸清洁生产的指标评价体系，并以此为依据对现有衣康酸生产的工艺首次从清洁生产的角度进行了系统的研究，找出现有工艺中存在的问题，分析问题产生的原因，并提出衣康酸清洁生产工艺改进的方案，本研究沿着先从实验室研究规模入手得到相关的基础数据，再以此为依据逐步扩大实验规模直至在大规模生产中取得应用，通过三年的研究与实践，其中的多项研究成果已经在生产中得到应用，并取得了良好的效果。

The best parmeters of technological process on the fermentation of itaconic acid by Aspergillus terrus was stuied.

利用正交试验法对土曲霉发酵生产衣康酸工艺条件进行研究，获得了较优越的工艺条件，使衣康酸得率提高到43.8g/L。

Laryngopharyngeal reflux disease is caused by the acid in the refluxing process to make the larynx injured, and in esophagus or stomach also have others complications.

咽喉胃酸逆流疾病引起的主因是胃酸在逆流的过程中对咽喉产生损伤，且同时在食道或是胃也有相关并发症发生。

Objective:To optimize the extraction process of Ferulic Acid and Ligustilide in Ligusticum chuanxiong Hort.

目的 ：研究川芎中有效成分阿魏酸及藁本内酯的最佳提取条件。

A spray drying process of preparation of diisporopyl malonate with super acid as catalyst was studied.

介绍了一种以喷雾干燥脱水，以超强酸催化酯化合成丙二酸二异丙酯的方法。

A new process has been studied to synthesize malonic acid from diethyl malonate through hydrolysis reaction and catalyzing by 732 type cation exchange resin.

用732型阳离子交换树脂催化水解丙二酸二乙酯制取丙二酸，考察了反应温度、反应时间、水与丙二酸二乙酯的质量比、丙二酸二乙酯与树脂质量比等工艺条件对收率的影响。

Taking zinc oxide and phosphoric acid as raw materials and silane coupling agent as modified agent,the micro-size zinc phosphate is prepared by wet-process mechanicochemical method and its modification is carried out.

以氧化锌和磷酸为原料，以硅烷偶联剂为改性剂，采用机械力化学湿法制备微细磷酸锌并进行表面改性。

The phenomenon can see from the SEM that,after the exciting of acid,steel slag process to secondary hydration together with cement clinker,combining to a great deal of meshy gelatin.

从SEM照片看出，钢渣在酸性激发剂作用下，与熟料水化产物发生二次水化，相互联结在一起，形成大量的网状结构的絮状凝胶。

The thesis calcines process by the fact that the laboratory high temperature Stove simulates the rotary kilns producing ascent K2SO4 adds amounts H3PO4,calcination time and the kiln head calcine the temperature specifically for four kind of the mass affecting a titanium dioxide calcines a parameter mainly, take that white degree, eliminates the color force , PH value and attracts a water yield as main quality index ,adopt the homogeneous sample to follow the parameter having carried out an optimization on specially appointed composition and slanting mass metatitanic acid calcining the best calcination having tested, gaining a group of synthetical quality index.

本论文通过实验室高温炉模拟生产现场回转窑煅烧过程，针对影响钛白质量的四种主要煅烧参数K2SO4加量、H3PO4、煅烧时间和窑头煅烧温度，以白度、消色力、遮盖力和吸油量为主要质量指标，采用均匀是要法对特定组成和质量的偏钛酸进行了优化煅烧试验，获得了一组综合质量指标最好的煅烧参数。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。