The ternary system of urea-phosphoric acid-water at 20℃ and 40℃ is investigated by the wet slag method with XRD, thus the solubility data of urea and phosphoric acid in water are obtained and the crystal area of urea phosphate[CO(NH_2)_2·H_3PO_4] is determined for the theory guidance of industrial production of urea phosphate.
The extraction effect of microwave 3 min was equivalent to supercritical-CO2 extraction for 2 h and soxhlet's extraction for 6 h. The microwave extraction is rapid, simple, and applicable to industrial production.
Whether It could turn to industrial production from the traditional handicraft,satisfying common consumer to collect each need for work,pushing the development of the whole porcelain and ceramics cultural market finally.
The high yielding cultivation methods of alfalfa and scientific management methods suitable for industrial production of alfalfa, according to the geographical conditions and climate characteristic in the low plain of Huanghuaihai area, were given in this paper.
Viewing the three factor structure system of grain, economic and fodder crop as the key factors in the revolution of new agricultural technique, the industrial production should be largely developed through the reasonable arrangement of resources, the adjustment of industrial structure and operation pattern of company and farmer.
To adapt the automation of modern industrial production, this thesis develops a process-control expert system tool-the Visual Basic Expert System Tool (abbr. VB-EST) with simple construction and convenient interface.
为适应现代工业生产过程自动化的需要 ,本文开发了一个结构简单、界面友好、用于过程控制的专家系统工具 Visual Basic Expert System Tool(简称 :VB- EST)。
According to the model of computer control system in industrial production in home and abroad, the actuality and trend of the development of computer control system areinvestigated by deep analysis of the construction and qualities of direct digital control system (DDC), supervisory computer control system (SCC ), distributed control system (DCS) and fieldbus control system (FCS).
Programmable logic controller is widely used in the automatic control fields of industrial production. The actual use of the programmable logic controller meets the needs of mark systematic design.
Effects of reaction time, temperature, solvents, catalysts and feeding molar ratio on the yield and quality of products were investigated, and an improved procedure suitable for industrial production was established.
Carbon-based solid phase containing open and closed multiwalled carbon nanotubes (up to 5% of the total carbon) was found in the waste from industrial production of metallic lithium by electrolysis of lithium chloride melt with graphite electrodes.
The other technique leans upon the traditional technology commonly adopted in an industrial production of the above chloramines and includes, in addition to the earlier existing steps, a step we proposed for purifying waste water.
In the basic medium, 4-iodophenoxyacetic acid is prepared by the reaction Of phenoxyacetic with sodium iodide, potassium iodide or iodine in the presence of sodium iodate, potassium iodate or potassium permanganate as an oxidizing agent. The yield has amounted to 79-88%, which is about twice as much as the best yield being reported in the literature[2]. The method possesses the follow- ing advantages: (1) requirement of only the stoichiometric amount of the iodi- nation agent, (2) using of water as the solv...
On the basis of industrial production of soybean—casein, we try to change the proportions of chemical reagents and the temprature of extraction.It has been found that the suitable increment of NaOH and CaO gives marked yields of soybean —casein and the suitable increase of the amount of Na_2SO_3 and Na_2S_2O_4 gives whiter products.When the temprature of extraction is suitably raised an improved product has been obtained. We find three kinds of different proportions of chemical reagents and unde...
In order to find a non-vanadium catalyst for the oxidation of SO_2, experiments with Cr-Sn system have been carried out, with the emphasis on the proportion of active components, methods of preparation, choice of supporting material and methods of addition of the support, service life and thermal resistance, on the work basis of the previous people (1,2). Results have demostrated that, on the Cr-Sn catalyst prepared by the impregnation-calcination method proposed by us, at temperature of 500℃. and space...