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Solid polymer degassing method and device

A solid polymer and degassing device technology, which is applied in the field of solvents and unreacted monomers in polyolefin resins, can solve the problems of low degassing efficiency, unfriendly environment, and large consumption of raw materials, and achieve strong practical significance and Application value, reduced degassing time, effect of reduced usage

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In summary, the existing solid polymer degassing methods have disadvantages such as low degassing efficiency, high energy consumption, high raw material consumption, and unfriendly environment. Solid polymer degassing method has high economic benefits and practical significance

Method used

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Examples

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Effect test

Embodiment 1

[0053] Using the above-mentioned device, the ethylene-butene copolymerized linear low-density polyethylene (LLDPE) product is produced by the gas phase fluidized bed process. The reaction temperature of the fluidized bed reactor 1 is 88 ° C, the reaction pressure is 2.1 MPa, and non-condensing operation is adopted. The flow rate of each component in the discharge stream is: LLDPE powder 40t / h, nitrogen 200kg / h, hydrogen 3kg / h, ethylene 2600kg / h, 1-butene 2500kg / h. Among them, ethylene and 1-butene are unreacted monomers without solvent. The LLDPE product discharged from the fluidized bed reactor 1 first enters the product discharge tank 2 driven by the conveying gas, and then enters the product buffer tank 3 at a pressure of 0.7 MPa to remove part of the hydrocarbons adsorbed on the surface of the polyethylene particles, and then Enter the three-stage degassing process. Nitrogen is used as the first-stage degassing medium, and the flow rate of the first-stage degassing medium...

Embodiment 2

[0056] Using the same device as in Example 1, the ethylene-hexene copolymerized linear low-density polyethylene (LLDPE) product was produced by a gas phase fluidized bed process. The reaction temperature of the fluidized bed polymerization reactor 1 was 88 ° C, and the reaction pressure was 2.1 MPa. Use non-condensing operation. The flow rate of each component in the discharge stream is: LLDPE powder 40t / h, nitrogen 180kg / h, hydrogen 3kg / h, ethylene 2600kg / h, hexene 2000kg / h. Among them, ethylene and hexene are unreacted monomers without solvent. The LLDPE product discharged from the fluidized bed reactor 1 firstly enters the product discharge tank 2 driven by the conveying gas, and then enters the product buffer tank 3 to remove part of the hydrocarbons adsorbed on the surface of polyethylene particles, and then enters the third stage degassing process. Nitrogen is used as the first-stage degassing medium, and the flow rate of the first-stage degassing medium is 300kg / h, an...

Embodiment 3

[0059] Using the same device as in Example 1, the ethylene-butene copolymerized linear low density polyethylene (LLDPE) product is produced by the gas phase fluidized bed process, the reaction temperature of the fluidized bed reactor 1 is 88 ° C, and the reaction pressure is 2.1 MPa. Condensation operation. The flow rate of each component in the discharge stream is: LLDPE powder 40t / h, nitrogen 160kg / h, hydrogen 3kg / h, ethylene 2580kg / h, 1-butene 2300kg / h, isopentane 2500kg / h. Wherein ethylene and 1-butene are unreacted monomers, and isopentane is a solvent. The LLDPE product discharged from the fluidized bed reactor 1 firstly enters the product discharge tank 2 driven by the conveying gas, and then enters the product buffer tank 3 to remove part of the hydrocarbons adsorbed on the surface of polyethylene particles, and then enters the third stage degassing process. Nitrogen is used as the first-stage degassing medium, and the flow rate of the first-stage degassing medium is...

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Abstract

The invention provides a solid polymer degassing method. The solid polymer degassing method comprises the following steps: i) performing first-stage degassing: providing a first-stage degassing medium and enabling the first-stage degassing medium to be in reverse contact with a solid polymer to be degassed in a first-stage degassing bin to obtain a first-stage degassed polymer; ii) performing second-stage degassing: introducing the first-stage degassed polymer obtained in the step i) into a second-stage degassing bin to perform periodic pulse treatment, namely providing a second-stage degassing medium to the second-stage degassing bin and enabling the second-stage degassing medium to be in reverse contact with the first-stage degassed polymer in the second-stage degassing bin to obtain a second degassed polymer; iii) performing third-stage degassing: providing a third-stage degassing medium and enabling the third-stage degassing medium to be in reverse contact with the second degassed polymer in a third-stage degassing bin to obtain a final degassed polymer. The invention further provides a solid polymer degassing device for the method.

Description

technical field [0001] The invention relates to the technical field of solid polymer treatment, in particular to a method for removing gas from solid polymers, especially solvents and unreacted monomers in polyolefin resins, by utilizing gas phase reactive substances, gaseous hydrocarbons and inert gases. device. Background technique [0002] In the polymerization reaction, depending on the process and physical properties, the polymerization product will be in different states, among which the polymer is typically discharged from the reactor in the form of solid powder, such as the gas phase polyolefin process. When the solid polymer is discharged from the reactor, there are often residual solvents and unreacted monomers in the polymer powder. Taking the gas-phase fluidized bed production process of linear low-density polyethylene (LLDPE) as an example, the LLDPE powder contains unreacted Monomers, comonomers and condensing agents such as ethylene (C 2 h 4 ), propylene (C...

Claims

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Application Information

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IPC IPC(8): C08F6/00C08F10/00
CPCY02P20/582
Inventor 吴文清贾世敏阳永荣骆广海王靖岱孙婧元蒋斌波杜焕军王晓飞陈德明高玉芝黄正梁廖祖维陈楠
Owner CHINA PETROLEUM & CHEM CORP
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