Study And Practice Of The Co-loading Of Disproportionation And Transalkylation Catalysts On Commercial Plant

The process of toluene disproportion is an important technology of aromatics mutual conversion. The purpose is to convert the directly less used and relative surplus toluene, C9 aromatics and C10 aromatics into benzene and xylene which are widely used and relatively scarce. In recent years, along with the increasing development of toluene disproportion industry in our country, the current domestic industrial applied catalysts for toluene disproportion are mainly from TA series catalyst of UOP in USA and HAT series catalyst of Shanghai petrochemical institute in China.According to the actual need, Tianjin Petrochemical explored the research of the performance of mixed HAT-095 and HAT-096 catalysts. It was the first application of mixed catalysts of the two types in large quantity and it was of practical value on the research of its performance. It can on the one hand,increase the economic benefits of industrial unit and also make the researcher better evaluate the HAT series catalysts, providing reliable industrial data and enforce the international competitive strength on the other.Through calculation, a better proposal of loading catalysts was chosen. The position of sensitive tray of heavy aromatics column and the temperature of xylene tower were adjusted; hydrogen piping was extended; the toluene storage drum was used; the original disproportion feed drum was changed into drum special for C9 aromatics storage and separate the feed toluene and C9 aromatics accordingly. By the series reconstruction and preparation of the unit, the catalysts enjoyed long term steady operation and performance and better met the production requirement.