查询词典 acid process

In this paper,investigation has been made on the process for the synthesis of salicylaldehyde by esterification-oxidation with phenol,paraformaldehyde,boric acid as initial materials.

探索了以苯酚、硼酸和多聚甲醛为原料的酯化氧化法合成水杨醛的工艺路线，根据反应特点，改进了酯化反应方式，采用了多聚甲醛气态解聚法作为羟甲基化反应的进料方式，探讨了羟甲基化反应温度、多聚甲醛原料含水量、催化氧化反应催化剂用量对反应收率的影响并得到最佳反应条件，水杨醛收率为60.5%，纯度达98%以上。

The process of producing vanadium pentoxide from bone coal vanadium mine without salt roasting and acid leaching, was systematically studied.

系统地研究了石煤无盐焙烧酸浸生产五氧化二钒的工艺技术，提出了各工序的工艺条件。

The process of decreasing the acid value of the booster pellets used semifinished PETN was studied by the exploring test in lab, the mini test and the medium test on the production line.

对传爆药柱用粗品太安降低酸值进行了试验室摸索试验、生产线小型和中型试验。

The process of decreasing the acid value of the booster pellet s used semifinished PETN was studied by the exploring test in lab, the mini test and the medium test on the production line.

对传爆药柱用粗品太安降低酸值进行了试验室摸索试验、生产线小型和中型试验。

The phosphate rock is treated with phosphoric acid and, in the manufacturing process, the gypsum is removed.

在加工过程中用磷酸对磷酸盐矿石进行处理，去除石膏。

This paper was based on the technology problem that wet-process phosphoric acid was used as material to produce sodium tripolyphosphate.

本文以国内现行的用湿法磷酸生产三聚磷酸钠的工艺技术不完善的问题为基础，系统地分析了整个过程的基本原理，并根据其中的问题，提出新的方法，进行新工艺的研究。

At last,in allusion to the existing problems,research direction and development suggestions for kiln-process phosphoric acid were proposed.

针对窑法磷酸工艺存在的问题，提出了窑法磷酸的研究方向和发展建议。

The first process is failed, which is for manufacture of monopotassium phosphate and sodium chlorate from potassium chloride, phosphoric acid and sodium hydroxide.

以氯化钾、磷酸和氢氧化钠为原料联产磷酸二氢钾和氯酸钠的工艺路线还存在一些问题。

Optimal process conditions for preparing N,N'-ethylenediamine diacetic acid: Potassium cyanide was combined with formaldehyde and ethylenediamine at a mole ratio of 2.4 to 2.4 to1, at temperature 18℃,and then was hydrolyzed for 8 hours.

通过单因素分析，合成N，N′—乙二胺二乙酸的最佳反应条件为：反应温度为18℃，水解时间为8 小时，甲醛∶氰化钾∶乙二胺的摩尔比为2.4∶2.4∶1。

Technology and security from the comparison, the use of CAD software graphics rendering process flow chart of the hydrochloric acid.

通过从工艺和安全上的比较，绘制了盐酸的工艺流程图。

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％。