Turbulent mesophase pitch process and products

A technology of mesophase pitch and pitch, applied in the field of formation of mesophase pitch

Active Publication Date: 2019-02-12
エーシーピーテクノロジーズエルエルシー
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Method used

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  • Turbulent mesophase pitch process and products
  • Turbulent mesophase pitch process and products
  • Turbulent mesophase pitch process and products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0089] Applicant used 9.52 mm (3 / 8") outside diameter (OD) pipe 15.24 m (50 ft) long with a 0.711 mm (0.028") wall thickness fabricated from Type 316L stainless steel (ss), Type 316L stainless steel was heated by a Miller 300CP welder to pass an electrical current through the reactor tubes for the applicant's experimental studies. The results shown in the table below were produced over a continuous 30-hour operating cycle. The residue and overhead were drawn off every 2 hours. Softening point and primary coke value analyzes were performed on samples of these effluents.

[0090]

[0091] For all tests, the superheated steam feed rate was approximately equal to the bitumen feed rate. The staging unit was shut down in good working order after processing 146.9 kg of M-50 bitumen as feed. This means that the average thickness of coke deposited on the inner wall of the tube is less than 0.0254 mm (0.001 inch), or the pressure drop in the tube will become an unacceptable pressu...

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Abstract

A process for producing mesophase pitch using a long tube reactor is disclosed. An aromatic rich feed, preferably a petroleum pitch having a softening point above 100 DEG C, is preheated to a temperature above its softening point and mixed with a vapor, preferably steam, in a long tubular reactor under intense mixing conditions, preferably fully developed turbulent flow such as mist annular flow,with a residence time at least an order of magnitude less than prior art processes and preferably less than 10 seconds. Preferably the reactor is heated by electric resistance or induction heating orby immersion in a heated fluid or in a fired heater. Mesophase pitch with a high coking value and a surprisingly low quinolone insoluble content is produced. The byproducts of thermal polymerization and thermal dealkylation have less than 50 % as much olefin and diene content as compared to similar byproducts from prior art processes.

Description

technical field [0001] This invention relates to the formation of mesophase pitch for the production of carbonized fibers, foamed charcoal and other carbon or pitch based products. Background technique [0002] Mesophase pitches are an important and only recently recognized member of the pitch family. Mesophase pitch has optical properties and is used to make carbon fibers, carbon foam and other precious exotic materials. [0003] When natural or synthetic bitumen with aromatic groups is heated in a static state at a temperature of 350°C to 500°C, as the heating continues, insoluble liquid globules begin to appear in the bitumen and gradually increase in size. When examined by electron diffraction and polarized light techniques, the spheres were revealed to be composed of layers of aligned molecules aligned in the same direction. As the spheres continue to grow in size as heating continues, they come into contact with each other and gradually coalesce with each other to pr...

Claims

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Application Information

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IPC IPC(8): C08L95/00C10C3/02
CPCC08L95/00C10C3/002C10C3/02
Inventor 唐纳德·P·马隆唐纳德·M·李
Owner エーシーピーテクノロジーズエルエルシー
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