Production method of high-viscosity cotton pulp

A production method and cotton pulp technology, applied in pulp bleaching, pulp dehydration, pulping with inorganic alkali, etc., can solve the problems of temperature control gap, large difference in cooking pulp quality, long cooking cycle, etc., to achieve reasonable process and realize The effect of industrial mass production

Inactive Publication Date: 2020-07-10
ANHUI SNOW DRAGON FIBER TECH
View PDF8 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] (1) According to the continuous feeding method, the cotton linters are fed into the cyclone semi-pulp machine through open cotton, secondary open cotton, dry cleaning system, cyclone separator, screw pressure screw; the current of the cyclone semi-pulp machine is controlled at 400A~ In the range of 430A, the fiber is cut in series, and the fiber length is controlled at 3mm~5mm to obtain the slurry and send it to the material preparation tank.

[0110] (2) The slurry prepared in step (1) is pumped into the oblique spiral through the sizing pump, and then pre-dewatered into the double-roll extruder through the oblique spiral. The slurry is dehydrated to 25% dryness and enters the return spiral to ensure the return spiral. In the case of a certain amount of return material, the single screw meter is turned on, and the slurry enters the screw conveyor according to the calculated air-dry mass of 3.3 tons / hour, and is continuously and uniformly sent to the feeder, and enters the ...

Embodiment 2

[0118] The production method provided in Example 1 is used to obtain high-viscosity cotton pulp. The difference is that the temperature of the first cooking tube in step (3) is 125°C to 126°C, and the rotational speed is 1.8r / min; the second cooking tube The temperature is 124.8℃~125.8℃, and the rotation speed is 1.7r / min; the temperature of the third cooking tube is 124.7℃~125.7℃, and the rotation speed is 1.6r / min; the mixed slurry moves at a speed of 0.43m / min The cooking is carried out sequentially through the above three cooking tubes.

[0119] After testing, the quality testing results of the high-viscosity cotton pulp provided in Example 2 of the present invention are:

[0120] Degree of polymerization is 2712; whiteness is 74.6%; dust ≤488mm 2 / 500g; the nail fiber is 99.7%; the iron is 8×10 -6 ; Ash content is 0.07%; meets the performance requirements of high-viscosity cotton pulp 2600 products.

Embodiment 3

[0122] The production method provided in Example 1 is used to obtain high-viscosity cotton pulp. The difference is that: in step (3), the temperature of the first cooking tube is 124°C to 125°C, and the rotational speed is 1.9r / min; the second cooking tube The temperature is 123.8℃~124.8℃, the rotation speed is 1.8r / min; the temperature of the third cooking tube is 123.7℃~124.7℃, the rotation speed is 1.7r / min; the mixed slurry moves at a speed of 0.46m / min The cooking is carried out sequentially through the above three cooking tubes.

[0123] After testing, the quality testing results of the high viscosity cotton pulp provided in Example 3 of the present invention are:

[0124] The degree of polymerization is 2736; the whiteness is 74.3%; dust ≤493mm 2 / 500g; nail fiber is 99.7%; iron is 9×10 -6 ; Ash content is 0.08%; meets the performance requirements of high-viscosity cotton pulp 2600 products.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Lengthaaaaaaaaaa
Login to view more

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, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): D21C5/00D21C9/18D21C3/02D21C9/10D21C9/14
CPCD21C5/00D21C9/18D21C3/022D21C9/1005D21C9/14
Inventor 陈忠华吴保杰陶春昊
Owner ANHUI SNOW DRAGON FIBER TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap