【Daily Question】Deep processing of the polypropylene plant on 20160706?
Thread Content
To boost popularity and enhance technical exchanges among Haiyou users, we are launching [Question of the Day] starting today. Participation earns 4 points of wealth! 10 wealth points as a reward for correct answers or in-depth discussions! :Lol Question: Why can controlling the pressure in the reactor be sufficient to control the reaction temperature? :o Answer: Because the product of the reaction, isotactic polypropylene, is a solid that is insoluble in propylene, and there is very little random copolymer (compared to liquid propylene), the gas phase pressure is actually the saturated vapor pressure of propylene. The saturated vapor pressure of a substance has a one-to-one functional relationship with temperature; therefore, by controlling the pressure, the temperature is also controlled. ====================== Promotion of petrochemical activities: ☛Notice on the launch of the large-scale event “I’m saving energy – where are you?” in the petrochemical area: http://bbs.hcbbs.com/thread-1579199-1-1.html (Source: Haichuan Chemicals Forum). This event offers awards in both text and image categories. When there are over 200 entries, an additional grand prize will be awarded, worth 600 Haichuan coins; if there are more than 300 entries, the grand prize value increases to 1,000 Haichuan coins, and for 500 entries it rises to 1,500 Haichuan coins. First prize: 3 Haichuan commemorative water cups; second prize: 5 winners, each receiving 120 Haichuan coins; excellence awards: several winners, each receiving 200 wealth points. --------------------------------------------------------------- ☛“My plant, my home” – Photo competition (10 wealth points per photo): http://bbs.hcbbs.com/thread-1495069-1-1.html (Source: Haichuan Chemicals Forum). --------------------------------------------------------------- ☛Haichuan Freelancers’ large-scale “public welfare” event is now underway! http://bbs.hcbbs.com/thread-1576975-1-1.html (Source: Haichuan Chemical Forum)
By controlling the reaction pressure, it is possible to control the intensity of the reaction, and thus control the amount of heat released, thereby achieving temperature control! I’m not sure if it’s correct?
Negative pressure lowers the boiling point of the system
Answer: Because the reaction product (the isotactic form) is a solid that is insoluble in propylene, and the content of the random form is very low, the gas phase pressure is actually the saturated vapor pressure of propylene. There is a one-to-one relationship between the saturated vapor pressure of a substance and its temperature; once the pressure is fixed, the temperature is also fixed. Therefore, controlling the pressure is equivalent to controlling the temperature.
Since the reaction product (the isotactic form) is a solid that is insoluble in propylene, and the content of the random form is very low, the gas phase pressure is essentially the saturated vapor pressure of propylene. There is a one-to-one relationship between the saturated vapor pressure of a substance and its temperature; once the pressure is fixed, the temperature is also fixed. Therefore, controlling the pressure is equivalent to controlling the temperature.
The polypropylene reaction is an exothermic reaction; when the reaction is intense, the pressure rises. By controlling the pressure, it is possible to regulate the reaction rate as well as the reaction temperature.
Since pressure is achieved by heating and evaporating propylene, temperature is directly related to pressure.