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Mesophase pitch preparation system and mesophase pitch preparation method

A mesophase pitch and preparation system technology, applied in mesophase pitch preparation system, mesophase pitch preparation field, can solve problems such as easy coking, easy coking composition, high viscosity, etc.

Active Publication Date: 2021-04-27
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As pitch itself is a raw material with high viscosity, easy coking and complex composition, the production of mesophase pitch needs to be carried out at a relatively high temperature (usually greater than 380°C), resulting in a tendency to easily coke in the production process
Therefore, existing mesophase pitch preparation devices and mesophase pitch preparation methods have the defect of easy coking

Method used

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  • Mesophase pitch preparation system and mesophase pitch preparation method

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preparation example Construction

[0018] The invention provides a method for preparing mesophase pitch. The preparation method of mesophase pitch according to the embodiment of the present invention comprises the following steps:

[0019] The bitumen is preheated in order to obtain a liquid bitumen, which has better conveying properties. Wherein, pitch (raw material) can be solid or liquid. Optionally, the pitch includes at least one of coal tar pitch, coal direct liquefaction pitch and petroleum pitch.

[0020] The bitumen in liquid state is mixed with a first inert gas, so that the flow velocity of the bitumen is accelerated by the first inert gas.

[0021] The pitch is heated to a first preset temperature (polymerization temperature), and the pitch is polymerized at the first preset temperature to obtain mesophase pitch. Wherein, the flow mode of the bitumen carrying out the polymerization reaction is plug flow.

[0022] A second inert gas with a second preset temperature is introduced into the bitumen ...

Embodiment 1

[0067] The solid coal tar pitch produced by Shenhua Wuhai Energy Co., Ltd. is used as the pitch raw material. The softening point of the pitch raw material is 90°C, the volatile content is 65wt%, and the softening point deviation is ±1°C.

[0068] Break the asphalt raw material into solid powder less than 3mm, and put it into the preheater 10, use the preheater 10 to heat the asphalt to 180°C, use the delivery pump 50 to drive the asphalt into the mixer 20 at a flow rate of 50Kg / h .

[0069] Nitrogen gas at 380° C. is passed into the mixer 20 to mix with the asphalt, and the volume ratio of the nitrogen gas to the asphalt is 90:1. Subsequently, the pitch and the nitrogen enter the first heater 310, and the first heater 310 heats the pitch and the nitrogen to 410° C. (polymerization temperature) within 30 seconds, that is, the pitch and the nitrogen Stay in the first heater 310 for 30 seconds.

[0070] Next, the pitch and the nitrogen enter the plug flow reactor 40 . The pit...

Embodiment 2

[0073] The solid coal direct liquefaction bitumen produced by China Shenhua Coal Oil Chemical Co., Ltd. is used as the bitumen raw material. The softening point of the bitumen raw material is 150°C, the volatile content is 51wt%, the softening point deviation is ±1°C, and the ash content is 0.1%.

[0074] Break the asphalt raw material into solid powder less than 3mm, and put it into the preheater 10, use the preheater 10 to heat the asphalt to 280°C, use the delivery pump 50 to drive the asphalt into the mixer 20 at a flow rate of 50Kg / h .

[0075] Nitrogen gas at 450° C. is fed into the mixer 20 to mix with the asphalt, and the volume ratio of the nitrogen gas to the asphalt is 100:1. Subsequently, the pitch and the nitrogen enter the first heater 310, and the first heater 310 heats the pitch and the nitrogen to 510° C. (polymerization reaction temperature) within 5 seconds, that is, the pitch and the nitrogen Stay in the first heater 310 for 5 seconds.

[0076] Next, the ...

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Abstract

The invention discloses a mesophase pitch preparation system and a mesophase pitch preparation method. The mesophase pitch preparation system comprises: a preheater; a mixer provided with a feeding port, a first inert gas inlet and a discharging port, wherein the feeding port of the mixer is communicated with the discharging port of the preheater; a first heater, a feed port of the first heater is communicated with a discharge port of the mixer; and plug flow reactor provided with a feed port, a second inert gas inlet and a discharge port, and the feed port of the plug flow reactor is communicated with the discharge port of the first heater; wherein a delivery pump is arranged between the preheater and the mixer, and / or the delivery pump is arranged between the mixer and the first heater, and / or the delivery pump is arranged between the first heater and the plug flow reactor. The mesophase pitch preparation system disclosed by the embodiment of the invention has the advantages that mesophase pitch products with stable quality can be continuously produced, the product uniformity is good, the pitch product quality is good, pitch coking is greatly reduced, and the like.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a mesophase pitch preparation system and a mesophase pitch preparation method. Background technique [0002] Mesophase pitch is a nematic liquid crystal substance composed of disc-shaped or rod-shaped molecules, which is produced during the heat treatment of heavy aromatic hydrocarbons. Due to the advantages of excellent performance, high carbon yield and strong processability, mesophase pitch is recognized as an excellent precursor for advanced functional carbon materials, such as needle coke, mesophase pitch-based carbon fiber, and mesophase pitch-based carbon foam. , mesophase pitch-based carbon / carbon composite materials, etc., have great application prospects in the fields of defense industry, aerospace, cutting-edge technology, and daily life. [0003] Since pitch itself is a high-viscosity, coking-prone, and complex-composition raw material, the production of mesophase pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/00C10C3/10
CPCC10C3/002C10C3/10Y02E60/10
Inventor 张胜振朱豫飞魏建明刘均庆
Owner CHNA ENERGY INVESTMENT CORP LTD