Method for preparing high-hardness pulp by using grass type plants as raw materials

Abstract

The invention discloses a method for preparing high-hardness pulp by taking a grass plant as a raw material. The method comprises the steps of material preparation and stewing, the prepared raw material is conveyed into a digester to be stewed into the high-hardness pulp of which the hardness has a potassium permanganate value of between 16 and 28 and is equivalent to a Kappa number of between 24 and 50, a stewing method comprises that the grass plant raw material is prepared and then enters an impregnation screw to be conveyed into the digester, and a stewing reagent is added into the digester; steam is aerated to heat, and the thermal insulation is performed for the needed time when the needed pressure is achieved by heating. Compared with the prior art, the stewing and thermal insulation time of the method is greatly shortened, which greatly reduces energy consumption for enterprises and improves production efficiency; and the prepared high-hardness pulp can be taken as a raw material for preparing bleached chemical pulp.

Description

[0001] This application is a divisional case of an application with the application number 200710300209.X, the application date is December 5, 2007, and the invention name is "a pulp and black liquor prepared from grass raw materials, its preparation method and its application" Apply. technical field [0002] The invention relates to a high-hardness pulp, more specifically, to a high-hardness pulp prepared from grass plants and a preparation method thereof. Background technique [0003] The methods of producing pulp from plant fibers are: chemical method, mechanical method and chemical mechanical method. Chemical pulping is the use of chemical action to dissociate raw materials into pulp by removing certain components in plant fiber raw materials. It is the most widely used pulping method. In chemical cooking, it is divided into lime method, caustic soda method, and anthracene method. Quinone-caustic soda method, sulfate method, sulfite method cooking. [0004] The sulfite...

AI Technical Summary

Problems solved by technology

3. Due to the high content of silicon and carbohydrates in the raw materials, the viscosity of the black liquor is high and the recovery is difficult

4. Grasses now contain a large number of miscellaneous cells, which pose a series of hazards to papermaking

[0012] The second issue of Chemical Industry Times in 2002 published an article entitled "Research on Straw Low-pressure and Low-temperature Pulping". The article used rice straw as raw material to obtain bleached pulp through the steps of pre-impregnation, cooking, washing and sieving, and bleaching. Keep warm for up to 3.5 hours, requiring a lot of energy