论文部分内容阅读
一、概述在硫化法苯酚生产中,需用SO_2气体将苯酚钠盐溶液连续酸化成75％～78％的粗制苯酚。其酸化终点,各厂大都采用取样试纸测定。这种方法很麻烦,而且误差大、有毒味,特别是它仅能间断地测定反应情况,无法掌握生产中每一瞬间的PH变化,从而导致原料定额增加,质量下降。在连续的化工生产过程中,目前已广泛采用成套的酸度测定及其调节系统。但是,对于中小企业,如何自力更生、因地制宜地研制一种结构简单、工作稳定可靠、维护检修方便、造价便宜的酸度测定仪,仍然是很必要的。七一年在江苏省计量所的帮助下,我厂在苯酚酸化生产过程中,试验采用了一种结
First, an overview In the curing phenol production, the need to use SO_2 gas sodium salt solution of continuous acidification of 75% to 78% of the crude phenol. The acidification of the end, the majority of plants using test strip determination. This method is very troublesome, and the error is large, toxic taste, in particular, it can only intermittently determine the reaction situation, can not grasp the PH changes in each moment of production, resulting in raw material fixed increase, the quality decline. In the continuous chemical production process, has now widely used sets of acidity measurement and regulation system. However, for SMEs, how to develop their own efforts and adapt to local conditions to develop a simple structure, stable and reliable, maintenance and easy access, low cost acidity analyzer, is still very necessary. Seventeen years in Jiangsu Province, with the help of metrology, our plant in the production of phenol acidation, the experiment used a knot