Dechlorination method for high-chlorine raw material hydrogenation process

Abstract

The invention relates to a dechlorination method for a high-chlorine raw material hydrogenation process, in particular to a dechlorination method suitable for a reaction effluent containing chloride ions and solid particles generated in a waste biomass fuel hydrogenation process, which comprises the following steps: in a suspended bed reaction part, a dechlorination agent is added together with a suspended bed catalyst into a feed, in a reactor, chloride ions are converted into high-melting-point chlorine salt by a dechlorinating agent, the high-melting-point chlorine salt enters a subsequent thermal high-pressure separation part along with a reaction product, in the thermal high-pressure separation part, the reaction product is divided into a gas phase and a liquid phase, the liquid carries catalyst particles and the chlorine salt to flow downwards, and the gas flows upwards. The method is suitable for the dechlorination process of the hot high-pressure gas of the material flow of the chloride ions generated in the hydrogenation process of the biomass fuel suspended bed, the problems that the content of the chloride ions in the hot high-pressure gas is high, and the chloride ions of follow-up equipment materials are corroded in the cooling process are solved, and the operation safety of the hot high-pressure gas entering a follow-up system is improved.

Description

technical field [0001] The invention relates to a dechlorination method in the hydrogenation process of high-chlorine raw materials; in particular, the invention relates to a dechlorination method suitable for the reaction effluent containing chloride ions and solid particles produced in the hydrogenation process of waste biomass fuel. Background technique [0002] At present, plastic products have penetrated into all aspects of people's lives, which not only facilitate people's lives, but also cause huge pressure on the environment. The recycling of waste plastics is an effective way to promote the recycling of waste plastics, especially the hydrogenation of waste plastics. Biodiesel has broad application prospects and environmental protection significance under the current energy shortage situation. However, in practical applications, since most plastics contain chlorine, certain compounds containing chloride ions, such as HCl, will be produced during the hydrogenation pro...

AI Technical Summary

Problems solved by technology

However, in practical applications, since most plastics contain chlorine, a certain amount of compounds containing chloride ions, such as HCl, will be produced during the hydrogenation process. It enters the subsequent cooling system with the gas phase. As the temperature gradually decreases, the water vapor in the gaseous state condenses into liquid water. In the environment where the chloride ion content is greater than 25ppm and there is liquid water at the same time, most equipment such as high-pressure heat exchangers, high-pressure air coolers, etc. One or more of stress corrosion, pinhole corrosion, pitting corrosion, and crevice corrosion will occur, resulting in damage to high-pressure steel equipment and potential safety hazards

Images