Cotton linter alkali-compressed air pulping method and device

A technology of compressed air and linter alkali, applied in pulping with inorganic alkali, pulp bleaching, pretreatment with alkaline compounds, etc., can solve the problems of unsatisfactory treatment effect, small application range, environmental pollution, etc., and achieve emulsification and detoxification Good miscellaneous effect, increased reaction effect, high economic value effect

Inactive Publication Date: 2018-08-21
薛润林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing two cooking methods have problems such as polluting the environment, small scope of application, high cost, and unsatisfactory treatment effects.

Method used

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  • Cotton linter alkali-compressed air pulping method and device
  • Cotton linter alkali-compressed air pulping method and device
  • Cotton linter alkali-compressed air pulping method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as image 3 As shown, at this time, the pressure of the steam bag ≥ the pressure inside the ball, therefore, the steam can be input into the steam ball and can be used for heating.

[0042] After feeding, start the steaming ball, open the compressed air valve, enter the compressed air at 0.4MPa, pass in the steam for a 30-minute temperature rise, so that the temperature rises to 80°C, and keep the heat for 30 minutes, and then carry out a 10-minute pressure of the alkali, (the extruded alkali The liquid is used to mix the alkali) to make the liquid ratio in the ball ≤ 3, the liquid ratio is small, the slurry can better follow the steaming ball to rotate and stir, so that the slurry is in the vapor phase space, the temperature distribution is uniform, and the cooking uniformity is good. After the first caustic press, heat up to 120°C for the second time, keep the temperature for 60 minutes, carry out the second caustic press for 20 minutes, let off steam for 20 minu...

Embodiment 2

[0046] Such as Figure 4 As shown, when the steam drum pressure is less than the internal pressure of the ball, after adding compressed air, the internal pressure of the ball is greater than the steam drum pressure. Under this working condition, the heater can only be used for indirect heating.

[0047] After feeding, start the steaming ball, stop the steam release grate at the bottom, pass in compressed air to control the pressure at 0.4MPa, then turn on the circulation pump to heat up the heater once so that the temperature of the lye reaches 80°C, keep it for 40 minutes, and pass it through the heater again The second temperature rise makes the temperature of the lye reach 120°C, keep it warm for 60 minutes, pressurize the alkali for 20 minutes, release the steam for 20 minutes, and finish the pouring.

[0048] The heater heats up and circulates the lye, which improves the uniformity of lye penetration and the uniformity of temperature distribution. After the first tempera...

Embodiment 3

[0051] If the production unit is equipped with circulation pump and heater equipment, it can be steamed, bleached and pulped by heating up first and then adding compressed air.

[0052] Such as Figure 5 As shown, after the steaming ball is turned cold for 10 minutes, let the lye and cotton linters mix below, and then heat up to 100°C once, stop inputting steam, and change to compressed air, so that the pressure rises to 0.4MPa, due to normal temperature compressed air Entering, the temperature inside the steaming ball drops from 100°C to 90°C, keep warm for 40 minutes, pressurize the alkali for 10 minutes, make the liquid ratio in the ball ≤ 3.0, and after 10 minutes of steam release, carry out a second temperature rise to 130°C, and the pressure inside the ball is 0.165MPa. On the basis of 0.165MPa, enter compressed air, when the pressure rises to 0.4MPa, the temperature drops to 120°C, keep warm for 60min, press alkali for 20min, release steam for 20min, dump the material, ...

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Abstract

The invention discloses a cotton linter alkali-compressed air pulping method and device. The method includes: primary mechanical impurity removal, cotton linter primary soaking, secondary soaking, compressed air pressurization steaming, washing and bleaching and drying and packing. The device comprises a cotton opener, an induced draft fan, an impurity remover, an air blower, a cyclone separator,a screw press, a spherical digester, a compressed air tank, a washing tank, a belt-type press, a bleaching machine, an airflow dryer and a packer. Through matched use of alkali liquid and compressed air, permeation effect and oxidation action of the alkali liquid are improved greatly, and consumption of the alkali liquid is reduced; compared with conventional steaming methods, treated cotton linter is high in whiteness, few in impurity, economical, environment-friendly and lower in cost.

Description

technical field [0001] The invention relates to a cotton linter alkali-compressed air pulping method and device. Background technique [0002] In the prior art, there are generally two pulping processes for cotton linters. One is the traditional alkaline pulping process, which uses lye to cook the linters to saponify and emulsify the grease and wax in the linters. The purpose of impurities such as quality, iron, ash, etc. Under this method, it is generally believed that the higher the concentration of lye, the better, and the more the amount of lye, the better, so as to ensure that the lye and cotton linters are fully infiltrated and mixed for reaction, but considering the production cost, the amount of lye used If it is too large, the production cost will be too high, so the concentration of the lye used in this method is generally 26g / L-32g / L, and the weight ratio of lye to raw materials is greater than 5:1. But even so, this kind of process will also produce a large amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C1/06D21C7/00D21C7/10D21C9/10
CPCD21C1/06D21C3/02D21C7/00D21C7/10D21C9/10
Inventor 薛润林斯薛辉
Owner 薛润林
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