Modified pitch production process

Abstract

The invention relates to a modified pitch production process. The modified pitch production process comprises the following steps: mixing raw material pitch with the pitch at an outlet of a tube-type heating furnace; enabling the mixed pitch to enter a flash evaporating modifying reaction kettle, and performing flash evaporating and beta-modifying reaction; mixing the pitch which is conveyed out from the flash evaporating modifying reaction kettle and the pitch at the bottom of a secondary modifying reaction kettle firstly, enabling the mixed pitch to enter the tube-type heating furnace for heating, and then enabling the heated pitch to enter the secondary modifying reaction kettle for performing alpha-modifying; performing separating on the pitch which is modified twice in a fractionating tower to separate the pitch from oil; collecting light oil which is separated from a flash evaporating tower and the fractionating tower as flash evaporating oil after the light oil is cooled; enabling separated non-condensable gas to enter a vacuum system to ensure that modifying reactions of the flash evaporating modifying reaction kettle and the secondary modifying reaction kettle and a fractionating process in the fractionating tower are all performed under negative pressure; extracting the modified pitch from the bottom of the fractionating tower. According to the modified pitch production process, the generating amounts of an alpha-component and a beta-component can be effectively controlled and the product quality is controllable by adopting a double-kettle two-step method; the process is simple and feasible, energy-saving and environmentally friendly, and is applicable to various pitch raw materials.

Description

technical field [0001] The invention relates to the technical field of asphalt production, in particular to an energy-saving and environment-friendly modified asphalt production process applicable to various asphalt raw materials. Background technique [0002] Coal tar processing generally produces about 50% to 60% of asphalt, which is a bulk product of tar processing. The larger the processing scale, the more asphalt output. Modified asphalt is currently the main downstream product of asphalt, which is mainly used in the electrolytic aluminum industry to produce prebaked anodes, and to prepare battery rods or electrode binders. [0003] At present, domestic production of modified asphalt mostly adopts kettle-type thermal condensation polymerization process. This process uses medium-temperature asphalt as raw material, and achieves the purpose of asphalt modification by controlling a certain reaction residence time and appropriate reaction temperature in a reactor directly ...

AI Technical Summary

Problems solved by technology

The disadvantage is that the one-step reaction requires high temperature and time control, and the product quality is difficult to control; the separation of asphalt and oil products by steam stripping will also produce a large amount of process wastewater

[0007] To sum up, there is no relatively complete modified asphalt production process suitable for various asphalt raw materials, energy-saving, environmentally friendly, and high-quality products in China

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