Method for producing boiler fuel by utilizing papermaking black liquid

Abstract

The invention relates to a method for producing boiler fuel by utilizing papermaking black liquid, comprising two steps, namely extraction of lignin and preparation of boiler fuel, wherein the extraction of the lignin comprises the following steps of: firstly, adding glacial acetic acid into papermaking black liquid with the Baume concentration of 36-38'Be and stirring until the pH value becomes 7-8, then adding ammonia acetate and industrial alcohol sold on the market, stirring uniformly, then sealing 12 hours at normal temperature for depositing, carrying out azeotropic distillation on clear liquid for recovering all ethanol and most of water to obtain ammonia lignin paste, wherein the deposition is sodium acetate which is recovered as a byproduct after being washed with methanol; and the preparation of the boiler fuel comprises the following steps of: adding methanol and dioxane in the ammonia lignin paste, filtering after uniformly stirring to obtain basic fuel, and finally, and adding methanol to the basic fuel to produce the boiler fuel provided by the invention. Through the method provided by the invention, resource components in the black liquid are completely utilized, waste materials are changed into valuables, the pollution of the environment is remarkably lightened, the producing process is simple and convenient, and the produced boiler fuel has a high combustion value and lower cost.

Description

technical field

[0001] The invention belongs to the regeneration of pulping waste liquor, in particular to the treatment and utilization of papermaking black liquor. Background technique

[0002] Papermaking black liquor, also known as papermaking waste liquor, is not only a serious pollution source, but also a resource that can be recycled. In order to make the papermaking black liquor resourceful, some product technologies for various purposes have been developed in recent years, such as briquette binder, coal water slurry, correction fluid, etc. In the prior art, there is a piece of CN1207429A published on February 10, 1999, which is a papermaking waste liquid synthetic heavy oil (diesel) and its papermaking waste liquid treatment process; it is to remove papermaking waste liquid through multi-stage filtration. After sundries, heat up to the temperature of international heavy oil (diesel) to keep the temperature consistent, and make the Baume degree of the waste liquid a...