Method for improving gas-phase external circulation heat removal capacity of polymerization kettle
A polymerization kettle and external circulation technology, applied in chemical instruments and methods, chemical/physical processes, chemical/physical/physicochemical processes, etc., can solve the problem of no novelty in prepolymerization kettle equipment, reduce height and reduce labor Intensity, the effect of prolonging the operating cycle
Pending Publication Date: 2020-05-08
高煦 +1
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Problems solved by technology
Chinese patent (87100218.3) has more than 10 sets of liquid-phase bulk polymerization kettles in the liquid-phase bulk polymerization stage of industrialized devices: prepolymerization reactors, all of which are existing technologies, and the prepolymerization kettle equipment itself has no novelty
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Embodiment 1
[0044] Embodiment 1: as attached figure 1 shown. The liquid-phase bulk polymerization kettle 11 is a 10-cubic-meter liquid-phase bulk polymerization kettle. The propylene monomer and polypropylene powder entering the liquid-phase bulk polymerization kettle 11 from 100 are 4100 kg / hr, of which the polypropylene powder is about 6 ~ 15kg. The polypropylene powder is produced by polymerization at a low temperature of 10-40°C after the catalyst enters the first ~0.5 cubic meter liquid-phase bulk polymerization kettle (not shown in the figure). The propylene and polypropylene powder entering the liquid-phase bulk polymerization tank 11 continue to polymerize in the liquid-phase bulk polymerization tank. The polymerization temperature is about 70°C and the polymerization pressure is 2.7-3.5 MPAG. Part of the polymerization heat is removed by the jacket of the liquid-phase body polymerization kettle and the inner cooling pipe, and part of the polymerization heat is removed by the ex...
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The invention discloses a method for improving the gas-phase external circulation heat removal capacity of a polymerization kettle, belonging to the field of petrochemical engineering. A gas-phase external circulation heat removal mode of an existing polypropylene liquid-phase bulk reactor is improved; according to the gas-phase external circulation heat removal mode, monomers evaporated by polymerization heat firstly enter an external circulation condenser, non-condensable gas of the external circulation condenser is pumped back to a liquid-phase bulk polymerization kettle through a circulating fan, and condensed propylene automatically flows back to the liquid-phase bulk polymerization kettle by means of potential difference; and after improvement, the monomers evaporated by polymerization heat firstly enter the circulating fan and then enters the outer circulating condenser, and condensed propylene and non-condensable gas return to the liquid-phase bulk polymerization kettle together. According to the invention, the potential difference between the external circulation condenser and the liquid-phase bulk polymerization kettle can be reduced, the flow of gas-phase monomers leaving the liquid-phase bulk polymerization kettle is reduced, slurry fine particles carried by the gas-phase monomers leaving the liquid-phase bulk polymerization kettle are reduced, and the operation period of the external circulation condenser is prolonged.
Description
technical field [0001] The invention belongs to the field of petrochemical industry. [0002] The content of the present invention is about improving the method for removing heat from the gas phase external circulation of the liquid phase body polymerizer in the process of producing polypropylene. Background technique [0003] The polymerization methods of polypropylene mainly include liquid phase bulk polymerization, gas phase polymerization, continuous polymerization process in which liquid phase bulk polymerization and gas phase polymerization are combined, and batch polymerization in which liquid phase bulk polymerization is first performed in the same polymerization kettle and then gas phase bulk polymerization is performed. craft. [0004] Liquid-phase bulk polymerization belongs to the category of slurry polymerization, and the slurry polymerization mentioned in the present invention refers to liquid-phase bulk polymerization. [0005] (1) 94117003.9, CN1109066, "Pr...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C08F2/01C08F110/06C08F2/02B01J19/18
CPCB01J19/1856C08F110/06B01J2219/00081B01J2219/00094C08F2/01C08F2/02
Inventor 高煦高小凤
Owner 高煦