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Isopropanol production of raw materials is recycled, the total energy consumption is lower, the operation is safer, and the process is more complete.
.
.
Recently, a team of 6 students from the School of Chemical Engineering and the School of Safety Science and Engineering of Nanjing University of Technology The entry-"Process Design and Safety Evaluation of the Project with an Annual Output of 60,000 Tons of Isopropanol" won the Gold Medal of the 8th National University Student Chemical Safety Design Competition
.
Isopropanol has a wide range of uses in the fields of pesticides, electronics industry, medicine, coatings, daily chemicals, and organic synthesis.
It can be used to produce glycerin, isopropyl acetate, isopropyl ammonium salt, etc.
, and it can also be used to produce insecticides and disinfection.
agents and preservatives
.
The "Brothers and Sisters Riding the Wind and Waves" team investigated four isopropanol production processes: indirect hydration of propylene, direct hydration of propylene, hydrogenation of acetic acid and hydrogenation of isopropyl acetate
Because these production processes have serious equipment corrosion, many "three wastes", immature processes, and high raw material prices, the team finally chose the acetone hydrogenation method and innovatively used rectification-steam permeation membrane integrated separation technology
.
"Compared with traditional distillation, the total energy consumption of this process is reduced by 63%, which provides a solution for the efficient production and green production of isopropanol
.
" Team member Zhang Yijuan said that the process has successfully intercepted and efficiently recycled acetone.
"This scheme was available when we participated in the 15th National College Student Chemical Design Competition this year, but the competition at that time was more focused on the design of craftsmanship.
This competition is the two themes of craftsmanship and safety design.
Not enough, so we improved the process again
.
” Team member Xia Weicheng introduced
Because of the lack of relevant knowledge and background, on the advice of the teacher, Xia Weicheng and other four students from the School of Chemical Engineering and two students from the School of Safety Miao Yuxuan and Zhou Jingjing teamed up to compete
.
When the team was first formed, due to inconsistent professional backgrounds, the team also experienced a run-in period
After analysis, they found that when the feed valve of the membrane separation equipment is opened too wide or fully opened, the pressure in the reactor will increase, which may damage the membrane structure and cause material leakage and cause fire and explosion accidents
.
In this regard, Miao Yuxuan and Zhou Jingjing suggested to add a buffer tank before the steam permeable membrane feed and install a set of membrane separation equipment as a backup, but this plan was quickly rejected
In response to this situation, the students on both sides changed the mode of independent operations.
On the one hand, they not only proceeded from the perspective of safety, but also reconsidered the problem from the perspectives of operability and economic applicability; on the other hand, they analyzed the problem.
For disputes that occurred during the process, they consulted their instructors in time and discussed again
.
"The teachers will tell us some mature cases, and we will also tell the teachers about the difficulties and obstacles in the process of communicating with the other party, and ask the teacher to sort out the corresponding opinions for us, and then communicate with the other party
.
" Member Li Yifan said
After rounds of modifications, the team finally improved the operational safety of the membrane separation equipment by adding pressure control, flow transfer and safety bypass systems
.
"Increase pressure control in front of the membrane, and use DCS to ensure that the feed is a stable pressure flow
In addition to suggestions for improvement of production equipment, the team also "diagnosed" the entire process such as the safety management system of the production line, put forward suggestions for organizing on-site emergency response plans and emergency rescue knowledge training, regular instrument maintenance and operating personnel standard training
.
Team member Zhou Jingjing said: "We have put forward 18 suggestions for the entire production process plan, so that the design plan is not only energy-saving and environmentally friendly, but also safe and reliable
"This cross-industry team combination of participating teams has given us a better understanding of the importance of interdisciplinary integration
.
" The team leader, Zhao Zhenyi, said with emotion.
He expressed his gratitude to the two professors Guan Guofeng and Pan Yong for their careful guidance.
He is a "chemical man" who knows more about safety
.