关键化工本质安全测试.ppt

* In the second DSC thermogram the main reaction and decomposition are very close togather and hence if temperature control is not good then this reaction can easily go to undesirable decomposition. So DSC thermogram gives initial indication of how good a temperature control to be there and what margins you are having. * * TMR of 24hr is taken as relatively safer based on practical experience as one will have sufficient time take corrective action.As shifts are for 8hr anything less than would generally not acceptable. * * This can be derived experimentally based on DSC tests. * Based on the data given this is how the scenario will look like. As TMR is 8 hr this is not at acceptable safety level.The reason being reaction is slow at 90 degree and hence accumulation is high leading to high MTSR. So the study of reaction in RC1 at different temperature was carried out.Details in next slide. * Based on these data reaction temperature of 120 degree was most optimal with regards to safety.This also helped in productivity as reaction is now takes only 10 hrs instead of 30 hrs with earlier method. So these studies not only help us in arriving a safer process but many times would help in more productive (optimal) process * * Using an un-grounded FIBC type C can lead to a spark discharge which has enough energy to ignite ALL explosible mixtures! * These are some of the basic tests required for characterising powders. Based on these test results we can arrive at safe operating parameters. * This is how process is described when it comes from laboratory without much of the relevant data * This is what remained of the air circulating dryer. Then they came to us for investigation. * Steam pipe used for heating had exposed surface. Some of the dried powder deposited on this decomposed as the decomposition temperature was less than steam temperature. This decomposed mass must have fell in bulk which then spread. Also the decomposition mass gave large amount of gases which wa