1results about How to "Improve pulping" patented technology

The application discloses a kind of hydrophobic modified low rank coal and its preparation method and application, belong to surface modification technical field, preparation method includes the following steps: low rank coal, 4-vinyl benzoic acid, catalyst and DMF are added to three-necked flask, uniformly mixed, stirring is reacted for a certain time under certain temperature, washes with DMF and distilled water, drying, and intermediate product I is obtained;Intermediate product I, hydrophobic modifier and DMF are added to three-necked flask, uniformly mixed, initiator is added, ultrasonic 1h, stirring is reacted for a certain time under certain temperature, washes with DMF and distilled water, drying, and obtain hydrophobic modified low rank coal.Compared with other surface modification methods, hydrophobic chain is firmly combined on the surface of low rank coal and will not fall off.The coalification degree of low rank coal after hydrophobic modification is improved, which is beneficial to improve the slurry performance of modified low rank coal.