Method for preparing water-coal-slurry additive taking enzymatic hydrolysis lignin as raw material

Abstract

The invention provides a method for preparing a water-coal-slurry additive taking enzymatic hydrolysis lignin as a raw material. In the method, the chemical activity of the enzymatic hydrolysis lignin is utilized to directly perform polycondensation with sodium hydrogen sulfite, sodium metabisulfite, acetone and methanal to a prepare enzymatic hydrolysis lignin-sulphonated acetone-methanal condensation polymer (LSAF); the enzymatic hydrolysis lignin-sulphonated acetone-methanal condensation polymer (LSAF) is compatible with other types of surfactants, and is compounded with the surfactants, such as sodium dodecyl benzene sulfonate, PVA, carboxymethyl cellulose sodium and the like to prepare the water coat slurry which has higher stability and lower viscosity; and the liquidity of the water coat slurry is improved. The enzymatic hydrolysis lignin replaces the partial petrochemical raw materials to prepare modified high molecular materials, which not only lowers the cost of high molecular materials, but also can save the consumption of the petrochemical materials, and can generate significant social benefit; and the processing technique for preparing the water-coal-slurry additive taking the enzymatic hydrolysis lignin as a raw material is simple, is easy to implement and has good effect.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and more specifically relates to a method for preparing a coal-water slurry additive by using enzymatically decomposed lignin as a raw material. Background technique [0002] Coal water slurry is a new type of coal-based fluid fuel, referred to as CWS (Coal Water Slurry), a solid-liquid dispersion system prepared from about 70% coal, 30% water and a small amount (about 1%) of chemical additives. It is a thermodynamically unstable system. As a new type of low-pollution oil-substituting fuel, coal-water slurry converts coal powder from a traditional solid fuel into a fluid fuel. Therefore, coal-water slurry, like oil, has the characteristics of pumping, atomization, storage and stable combustion. It has significant advantages such as high combustion efficiency, easy load regulation, energy saving and good environmental benefits. Generally speaking, using coal water slurry as a clean coal technology ...

AI Technical Summary

Problems solved by technology

[0011]① Olefin sulfonate series have good viscosity-reducing and stabilizing effects on low-ash coal-water slurry. By controlling its molecular weight, the rheology of coal-water slurry can be taken into account at the same time and stability, and even eliminate the addition of other stabilizers, but the price is higher

However, the compounding method cannot change the hydrophilic and lipophilic groups and the surface activity of lignosulfonate

[0013]③ Humate and sulfonated humate series of dispersants have many characteristics similar to lignin, but they have better dispersibility and can be used alone. The main disadvantage is the poor stability of the slurry

[0014]④ Various substituent polynaphthalene sulfonate series: this type of dispersant has good dispersibility, good viscosity reduction effect, good slurry flow pattern, but poor slurry stability, It is easy to separate water and produce hard precipitation, and the price is high

What nonionic surfactants have in common is that they can be used not only as dispersants but also as stabilizers, but they have not been widely used due to their high cost