SU513985A1 - The method of regulating the process of polymerization or copolymerization of ethylene - Google Patents
The method of regulating the process of polymerization or copolymerization of ethyleneInfo
- Publication number
- SU513985A1 SU513985A1 SU1948578A SU1948578A SU513985A1 SU 513985 A1 SU513985 A1 SU 513985A1 SU 1948578 A SU1948578 A SU 1948578A SU 1948578 A SU1948578 A SU 1948578A SU 513985 A1 SU513985 A1 SU 513985A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- reactor
- temperature
- water
- beginning
- polymerization
- Prior art date
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/04—Pressure vessels, e.g. autoclaves
- B01J3/042—Pressure vessels, e.g. autoclaves in the form of a tube
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00054—Controlling or regulating the heat exchange system
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00054—Controlling or regulating the heat exchange system
- B01J2219/00056—Controlling or regulating the heat exchange system involving measured parameters
- B01J2219/00058—Temperature measurement
- B01J2219/0006—Temperature measurement of the heat exchange medium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
- B01J2219/00087—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
- B01J2219/00094—Jackets
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Polymerisation Methods In General (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
1one
Изобретение относитс к автоматизации производственных процессов и может быть использовано дл автоматического регулировани процесса полимеризации или сополимеризации этилена при высоком давлении в трубчатом реакторе.The invention relates to the automation of industrial processes and can be used to automatically control the process of polymerization or copolymerization of ethylene at high pressure in a tubular reactor.
Гемпературный режим реактора полимеризации этилена зависит от толщины пленки, налипшей на внутренние стенки реактора. При увеличении толщины пленки уменьшаетс производительность реактора из-за уменьшени действующего объема, ухудшаетс теплопередача от реакционной смеси к охлаждающей воде, увеличиваетс возможность аварийной ситуации.The temperature regime of the ethylene polymerization reactor depends on the thickness of the film adhering to the inner walls of the reactor. As the film thickness increases, the reactor capacity decreases due to a decrease in the effective volume, the heat transfer from the reaction mixture to the cooling water deteriorates, and the likelihood of an emergency increases.
Известен способ регулировани процесса полимеризации или сополимеризации этилена при высоком давлении в трубчатом реакторе, заключающийс в стабилизации давлени и температуры в реакторе, стабилизации температуры и расхода воды, охлаждающей начало реактора, причем толщину пленки полимера в реакторе уменьшают, прерыва реакцию полимеризации при помощи включени на некоторое врем подачи инициатора в реактор . Однако при этом ухудшаютс услови теплосъема в реакторе и уменьшаетс его производительность.There is a method of controlling the polymerization or copolymerization of ethylene at a high pressure in a tubular reactor, which consists in stabilizing the pressure and temperature in the reactor, stabilizing the temperature and flow of water to cool the start of the reactor, reducing the film thickness of the polymer in the reactor, interrupting the polymerization reaction by initiator feed time to reactor. However, this deteriorates the conditions for heat removal in the reactor and decreases its performance.
Дл улучшени условий теплосъема в реакторе и увеличени производительности последнего предлагаетс замер ть температуру воды, выход щей из рубашки реактора в его начале, и при понижении значени указанной температуры ниже допустимого осуществл ть периодическое кратковременное увеличение подачи в реактор низкотемпературного инициатора.In order to improve the conditions of heat removal in the reactor and increase the productivity of the latter, it is proposed to measure the temperature of the water coming out of the reactor jacket at its beginning, and with a decrease in the specified temperature below the permissible value, carry out a periodic short-term increase in the feed to the reactor of a low-temperature initiator.
На чертеже показана блок-схема одного из вариантов системы регулировани , реализующей предлагаемый способ.The drawing shows a block diagram of one of the variants of the control system that implements the proposed method.
Толстой линией на чертеже показан поток реакционной смеси, штрих-пунктирной - поток воды, охлаждающей начало реактора, пунктирной - поток инициатора, тонкимиThe thick line in the drawing shows the flow of the reaction mixture, the dash-dotted line is the flow of water cooling the beginning of the reactor, the dotted line is the initiator flow, thin
лини ми - св зи блоков.line - communication blocks.
Система регулировани реактора 1 и смесител 2 воды состоит из датчика 3 температуры воды, выход щей из рубашки начала реактора 1, датчика 4 давлени в реакторе,The control system of the reactor 1 and the mixer 2 of water consists of a sensor 3 of water temperature coming out of the jacket of the beginning of the reactor 1, a sensor 4 of pressure in the reactor,
датчика 5 температуры воды в смесителе 2 воды, датчика 6 расхода воды из смесител воды в рубашку начала реактора, датчика 7 температуры воды в реакторе, регул тора 8 давлени , регул тора 9 температуры в смесителе воды, регул тора 10 расхода воды из смесител , регул тора 11 температуры в реакторе , анализатора 12, сумматора 13, генератора 14, клапана 15 после реактора 1, клапана 16 на линии низкотемпературного инициатора в реактор.water temperature sensor 5 in water mixer 2, water flow sensor 6 from the water mixer to the reactor start jacket, water temperature sensor 7 in the reactor, pressure controller 8, water temperature controller 9 in the water mixer, water controller 10 from the mixer, torus 11 temperature in the reactor, the analyzer 12, the adder 13, the generator 14, valve 15 after reactor 1, valve 16 on the line of low-temperature initiator into the reactor.
Система регулировани работает следующим образом.The control system works as follows.
При помощи датчика 4, регул тора 8 и клапана 15 стабилизируют давление в реакторе 1. Посредством датчика 7, регул тора 11, сумматора 13 и клапана 16 регулируют температуру в реакторе 1. Коррекцию давлени по температуре осуществл ют при помощи св зи регул тора 11 с регул тором 8. Посредством датчика 6 и регул тора 10 стабилизируют температуру, и при помощи датчика и регул тора 9 - расход воды в смесителе 2.The sensor 4, the regulator 8 and the valve 15 stabilize the pressure in the reactor 1. The sensor 7, the regulator 11, the adder 13 and the valve 16 regulate the temperature in the reactor 1. The pressure is corrected for temperature using the controller 11 s. The controller 8. By means of the sensor 6 and the controller 10 stabilize the temperature, and with the help of the sensor and the controller 9 - the flow of water in the mixer 2.
Об увеличении толщины пленки в начале реактора суд т по уменьшению температуры воды, выход щей из рубашки начала реактора при посто нном расходе воды и посто нной температуре реакционной смеси в реакторе . Эта температура замер етс датчиком 3. При уменьшении толщины пленки в реакторе 1 температура охлаждающей воды повышаетс , так как температура реакционной смеси выше температуры охлаждающей воды. При увеличении толщины пленки ухудшаетс теплопередача через стенки реактора 1, в результате чего падает температура воды на выходе из рубашки начала реактора.The increase in film thickness at the beginning of the reactor is judged by the decrease in the temperature of the water leaving the jacket of the beginning of the reactor at a constant flow rate of water and a constant temperature of the reaction mixture in the reactor. This temperature is measured by sensor 3. As the film thickness in reactor 1 decreases, the temperature of the cooling water rises as the temperature of the reaction mixture is higher than the temperature of the cooling water. As the thickness of the film increases, the heat transfer through the walls of the reactor 1 deteriorates, as a result of which the temperature of the water leaving the jacket at the beginning of the reactor drops.
При понижении указанной температуры ниже некоторого заданного значени (дл данной технологической марки полимера)By lowering the specified temperature below a certain predetermined value (for a given technological grade of polymer)
осуществл ют при помощи анализатора 12 включение генератора 14. Посредством генератора 14 через сумматор 13 и клапан 16 производ т периодическое увеличение подачиThe generator 14 is turned on by means of the analyzer 12. Through the generator 14 through the adder 13 and the valve 16, the supply is periodically increased
в реактор 1 низкотемпературного инициатора . В результате этого за короткое врем температура в начале реактора повышаетс , пленка полимера проплавл етс , понижаетс , в зкость пленки и увеличиваетс скорость ееin the reactor 1 low-temperature initiator. As a result, in a short time, the temperature at the beginning of the reactor increases, the polymer film melts, decreases, the viscosity of the film, and increases its speed.
движени по реактору. Низкотемпературный инициатор используют дл увеличени температуры только в начале реактора.movement through the reactor. The low temperature initiator is used to increase the temperature only at the beginning of the reactor.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU1948578A SU513985A1 (en) | 1973-07-13 | 1973-07-13 | The method of regulating the process of polymerization or copolymerization of ethylene |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU1948578A SU513985A1 (en) | 1973-07-13 | 1973-07-13 | The method of regulating the process of polymerization or copolymerization of ethylene |
Publications (1)
Publication Number | Publication Date |
---|---|
SU513985A1 true SU513985A1 (en) | 1976-05-15 |
Family
ID=20561338
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU1948578A SU513985A1 (en) | 1973-07-13 | 1973-07-13 | The method of regulating the process of polymerization or copolymerization of ethylene |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU513985A1 (en) |
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1973
- 1973-07-13 SU SU1948578A patent/SU513985A1/en active
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