Method for low-pressure demetallization and dechlorination of coal tar

Abstract

The invention discloses a method for low-pressure demetallization and dechlorination of coal tar and is mainly used for solving the problems that the metal content in whole fraction of the coal tar in the prior art is very high, the operation period of a main hydrogenation device is strictly restricted, the chlorine content is relatively high, the device can be corroded in the processing process, and the sustained development of hydrogen processing is further seriously hindered. The method for low-pressure demetallization and dechlorination of the coal tar comprises the following steps of loading a protection catalyst in a fixed bed hydrogenation reactor; introducing hydrogen from the bottom of the fixed bed hydrogenation reactor, and introducing the coal tar from the top of the fixed bed hydrogenation reactor; arranging a sixth pipeline at the top of the fixed bed hydrogenation reactor, and injecting a hydrogen chloride absorption solvent into the sixth pipeline. Through the scheme, the purposes of effectively ensuring the long-period operation of the main hydrogenation device and the sustained development of hydrogen processing are achieved, and the method further has very high practical application and popularization values.

Description

technical field [0001] The invention relates to a method for low-pressure demetallization and dechlorination of coal tar. Background technique [0002] Coal tar is one of the important products of the coking industry. Its output accounts for about 3% to 4% of the furnace coal. Its composition is extremely complex, mainly aromatic hydrocarbons. In most cases, it is specially separated and purified by the coal tar industry. Take advantage of it. Coal tar can be further processed to separate various chemicals and can also be processed into high-quality fuel oil. [0003] With the continuous in-depth development of my country's economic construction, especially the iron and steel industry, the coking industry has also developed rapidly. Now my country has developed into the world's largest producer of coke and coal tar. By the end of 2012, the national coal tar production had exceeded 25 million tons. / year, however, the actual amount of deep processing of coal tar in my count...

AI Technical Summary

Problems solved by technology

[0003] With the continuous in-depth development of my country's economic construction, especially the iron and steel industry, the coking industry has also developed rapidly. Now my country has developed into the world's largest producer of coke and coal tar. By the end of 2012, the national coal tar production had exceeded 25 million tons. / year, however, the actual amount of deep processing of coal tar in my country is less than 8 million tons / year, and the amount of deep processing is seriously insufficient, which will cause a great waste of resources and environmental pollution. With the development of the coal coking industry, how to realize the The deep processing and clean processing of tar has become an important issue in the development of the industry

[0004] At present, most enterprises adopt the hydrogenation process to produce clean fuel oil. This clean processing method not only meets the requirements of the country's policies on developing new energy sources and protecting the environment, but also brings good economic benefits to enterprises. However, coal tar The metal content in the whole distillate is very high, usually higher than 200μg / g, some even as high as 400μg / g, which seriously restricts the operation cycle of the main hydrogenation unit

In addition, the chlorine content in coal tar is also high, so it will corrode the device during processing, which is not conducive to deep processing and clean processing, and seriously hinders the sustainable development of hydrogen processing

Images