Production method of high-viscosity cotton pulp

Abstract

The invention provides a production method of high-viscosity cotton pulp, which comprises the following steps: (a) pulping cotton linters, mixing the pulped cotton linters with steam and cooking liquor, and carrying out horizontal pipe continuous steaming to obtain cooked pulp, wherein the temperature of the horizontal pipe continuous steaming is 122 DEG C to 127 DEG C, the rotating speed is 1.5 r / min to 1.9 r / min, the time is 65 min to 100 min, and the pressure is 0.1 MPa to 0.18 MPa; (b) sequentially carrying out pulp extrusion, washing, impurity removal, previous refining, first desanding,first concentration, pre-acidification and chloridizing alkalization on the cooked pulp obtained in the step (a) to obtain to-be-bleached pulp; (c) bleaching the to-be-bleached pulp obtained in the step (b) to obtain bleached pulp; and (d) sequentially carrying out second desanding, second concentration, refining after bleaching, defibrination and papermaking on the bleached pulp obtained in the step (c) to obtain the high-viscosity cotton pulp. Compared with the prior art, the production method has the advantages that stable, reliable, continuous and rapid production of the high-viscosity cotton pulp can be realized, the obtained product meets the performance requirements of the high-viscosity cotton pulp 2600 product, and the quality fluctuation is small.

Description

Technical field [0001] The invention relates to the technical field of cotton pulp production, in particular to a method for producing high-viscosity cotton pulp. Background technique [0002] High-viscosity cotton pulp is the raw material for the production of cellulose and ether ester products. It is widely used in petroleum exploration, food, medicine, and chemical industries, and has a wide range of applications. [0003] At present, the production of high-viscosity cotton pulp mainly adopts batch production by steaming ball method. However, the above-mentioned production method has the technical problems of long cooking cycle, large temperature difference in the ball caused by the way of entering the steam in the middle of the ball, the big difference between the temperature of the center of the ball and the temperature near the ball, and the poor uniformity of the cooking slurry quality; at the same time, due to the intermittent type In production, the processes of heating, ...

AI Technical Summary

Problems solved by technology

However, the above-mentioned production method has the technical problems of long cooking cycle, large temperature difference inside the ball, large temperature difference between the center of the ball and the temperature close to the ball, and poor quality uniformity of the cooking slurry due to the way of entering the steam through the pipe in the ball. In production, the process of heating up, venting, reheating, and venting of each ball needs to be manually controlled. There is a gap in operating time, the opening of the steam inlet and outlet valves, the speed of temperature rise, the speed of venting, and the temperature control gap. If there is any problem, it will cause a large difference in the quality of the cooking slurry between the ball and the ball.

With the development of new products and technologies, the requirements for the viscosity and stability of high-viscosity cotton pulp are getting higher and higher, and the production methods of high-viscosity cotton pulp in the prior art have been difficult to meet the requirements