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Method and system for olefin polymerization temperature control

A technology of olefin polymerization and automatic control system, which is applied in the direction of temperature control by electric means, which can solve the problems of severe polymerization reaction, excessive temperature fluctuation, adverse effects on the performance and quality of polyolefin products, etc., and achieve performance and quality stability Improvement, temperature control is stable and precise, and the effect of solving the unbalanced heat release

Active Publication Date: 2015-06-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the adverse effects on the performance and quality of polyolefin products caused by the severe polymerization reaction in the prior art and the excessive temperature fluctuation in the process of heating and removing heat

Method used

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  • Method and system for olefin polymerization temperature control
  • Method and system for olefin polymerization temperature control
  • Method and system for olefin polymerization temperature control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Temperature Control of Small Ethylene Polymerization Unit

[0043] At the beginning of the test, pre-set the preheating temperature T1_SP: 75°C, the reaction temperature T2_SP: 85°C, and the reaction time t: 2 hours according to the type and amount of the olefin catalyst; Wait for the raw materials; then open the hot water valve V1, and the jacket of the kettle is fed with hot water to raise the temperature. When the temperature reaches T0, the pressure in the kettle starts to increase. When the temperature reaches T1_SP, the hot water valve V1 is disconnected. After adding a certain amount of hydrogen, add the raw material gas ethylene, and increase the pressure to P2_sp: 1.03Ma, and then increase with the consumption of the polymerization reaction. Supplement raw material gas ethylene to maintain stable pressure. When the temperature reaches the reaction set temperature T2_SP, start the intelligent controller, start timing, and enter the reaction stage.

[0044] Dur...

Embodiment 2

[0048] Temperature Control of Small Propylene Polymerization Unit

[0049] At the beginning of the test, pre-set the preheating temperature T1_SP: 65°C, the reaction temperature T2_SP: 70°C, and the reaction time t: 2 hours according to the type of catalyst and the amount of feed; add a certain amount of silane, catalyst, etc. to the kettle under nitrogen protection Raw materials; a certain amount of hydrogen is introduced; and a certain amount of liquid-phase propylene is added. Then the hot water valve V1 is opened, and hot water is fed into the kettle jacket to raise the temperature. When the temperature reaches T1_SP, the hot water valve V1 is disconnected, and when the kettle temperature reaches the reaction set temperature T2_SP, start the intelligent controller, start timing, and enter the reaction stage.

[0050] The temperature control in the reaction stage is the same as that of the ethylene polymerization unit. When the constant temperature reaction timer expires, ...

Embodiment 3

[0052] Temperature Control of Ethylene Propylene Copolymerization Test

[0053] Carry out liquid-phase bulk homopolymerization of propylene first, and the method is the same as in Example 2: Application of a propylene polymerization device. After the completion, the mixed gas of ethylene and propylene in different proportions in the gas distribution tank is introduced into the polymerization kettle. During the copolymerization, the pressure, temperature, time, and stirring speed in the kettle are determined according to the specific test. The temperature control process of the ethylene propylene copolymerization test can also be completed by the intelligent control method and the olefin polymerization control device provided by the present invention.

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Abstract

The invention relates to a method and a system for olefin polymerization temperature control. The method and the system for the olefin polymerization temperature control aims at solving the problems that a polymerization reaction in the prior art is severe, temperature fluctuation is large in the process of heating and heat dissipation and bad influences on performance and quality of a polyolefin product are caused due to lag of the temperature. An artificial intelligent method is adopted. A manipulated variable of the method is the temperature. According to a designed intelligent controller, in the process of the polymerization reaction, opening time of a hot water valve, an inner cold water valve and an outer cold water valve is controlled according to deviation and slope rate of the temperature fluctuation so that accurate control of the polymerization temperature and continuously automatic control of three steps of temperature rising, temperature maintaining and temperature dropping are achieved in the process of an intermittent polymerization reaction. The invention further provides a control device for the olefin polymerization reaction. According to application, control requirements for a temperature parameter of the olefin polymerization device can be completely satisfied according to the intelligent control method, dynamic property of the system is improved and the performance and the quality of the olefin product are improved.

Description

technical field [0001] The invention relates to a method for controlling polymerization temperature in batch polymerization reaction, belonging to the field of automatic control of production process. In particular, the invention relates to a method and a device for controlling the reaction temperature of a polymerization tank of main equipment in a small olefin polymerization device. technical background [0002] The polymerization reaction process is a complex and typical industrial process in the chemical industry. Polymerization is usually an exothermic reaction, and the molecular weight of the polymer and its distribution are very sensitive to temperature. The speed at which monomers are transformed into polymers in the polymerization reaction is not only related to the reaction temperature, the type and amount of initiator (or catalyst), but also to the pressure of the monomers in the reaction. In batch polymerization operation, the reaction is not carried out unifor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F2/01G05D23/19
Inventor 吴小英吴瑾吕媛媛孙康李庆刘瞻刘鑫申庆伟
Owner CHINA PETROLEUM & CHEM CORP
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