Method for preparing molecular sieve-type dehydrating agent of coal tar

Abstract

The invention discloses a method for preparing a molecular sieve-type dehydrating agent of coal tar. The molecular sieve-type dehydrating agent of the coal tar is prepared from sodium carboxymethyl starch, attapulgite, alkyl phenolic resin polyoxyethylene ether, sodium metaaluminate, sodium silicate, silver nitrate and other raw materials. According to the method for preparing the molecular sieve-type dehydrating agent of the coal tar, the phosphoric acid-modified attapulgite is adopted so as to increase adsorption sites and water storage space of the product, and a molecular sieve is producedby optimizing preparation of the molecular sieve and preparing semidry gel by using extraction filtration, so that the solid content in a reaction vessel is improved, the production energy consumption of each unit mass of the molecular sieve is reduced, and the overall hydrophilicity of the material is improved; the usage amount is small when the molecular sieve-type dehydrating agent is in use,the preparation cost is low, and the water content of a coal tar finished product is met; compared with an existing dehydrating method, the molecular sieve-type dehydrating agent has the advantages ofa high dehydrating speed, low cost and small pollution to the environment.

Description

technical field [0001] The invention relates to the technical field of dehydrating materials, in particular to a preparation method of a molecular sieve type coal tar dehydrating agent. Background technique [0002] Coal tar is an oil product obtained during high-temperature dry distillation and gasification of coal. In the process of coal coking, the high-temperature raw gas is recovered by spraying circulating ammonia water and condensing and cooling in the primary cooler. In addition, the high-pressure ammonia water injection method is used for smokeless coal charging, so the tar contains a large amount of ammonia water. Moisture in tar has many adverse effects on subsequent distillation operations. Mainly include: (1) In the intermittent tar distillation kettle, if the tar contains a lot of water, the dehydration time will be prolonged to reduce the production capacity of the equipment and increase energy consumption; (2) In the continuous distillation system of the tub...

AI Technical Summary

Problems solved by technology

In the hydrothermal reaction process of crystal growth, a large amount of water is used as a solvent, occupying most of the volume in the reactor, so that the output of a single reactor is limited, and because the crystallization process needs to be completed at a high temperature, the existence of a large amount of solvent makes the energy per unit output High consumption

At the same time, the use of molecular sieves alone is limited and cannot meet people's needs. Therefore, further compounding and modification are required to improve the application field and efficiency of molecular sieves.