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Pretreatment method of bamboo fibers for direct nitrification

A bamboo fiber and pretreatment technology, applied in fiber raw material treatment, cellulose raw material pulping, pulping with inorganic alkali, etc., can solve environmental pollution and other problems, and achieve the effect of simple raw materials, saving consumption and low cost

Inactive Publication Date: 2020-11-06
江西吉润花炮新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This means that the whole preparation process of nitrobamboo cellulose has serious environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of pretreatment method of direct nitration bamboo fiber, concrete steps are as follows:

[0021] Put 300g of bamboo fiber in a pressure container with stirring and heating functions, seal the container and vacuumize it, and heat the container to 120°C at the same time, keep the vacuum constant, and turn off the heating after keeping the temperature for 3 hours; keep the vacuum constant Change, inject a lithium carbonate solution with a concentration of 5% into the container until the bamboo fiber is just submerged, then start stirring, stop stirring after stirring for 5 hours, turn off vacuuming, and after the pressure in the container returns to normal pressure, open the pressurization valve , the pressure in the container is increased to 3 atmospheres, the pressure is kept constant, the stirring is started, the stirring is stopped after 3 hours, and the pressure in the container is returned to normal pressure; the valve at the bottom of the pressure container is...

Embodiment 2

[0023] A kind of pretreatment method of direct nitration bamboo fiber, concrete steps are as follows:

[0024] Put 5kg of bamboo fibers in a pressure container with stirring and heating functions, seal the container and vacuumize it, and heat the container to 80°C at the same time, keep the vacuum constant, and turn off the heating after keeping the temperature for 5 hours; keep the vacuum constant Change, inject a lithium carbonate solution with a concentration of 10% into the container until the bamboo fiber is just submerged, then start stirring, stop stirring after 3 hours, turn off vacuuming, and after the pressure in the container returns to normal pressure, open the pressurization valve , to increase the pressure in the container to 5 atmospheres, keep the pressure constant, start stirring, stop stirring after stirring for 1 hour, and return the pressure in the container to normal pressure; open the valve at the bottom of the pressure container, and after the lithium car...

Embodiment 3

[0026] A kind of pretreatment method of direct nitration bamboo fiber, concrete steps are as follows:

[0027] Put 25kg of bamboo fibers in a pressure container with stirring and heating functions, seal the container and vacuumize it, and heat the container to 100°C at the same time, keep the vacuum constant, and turn off the heating after keeping the temperature for 4 hours; keep the vacuum constant Change, inject a lithium carbonate solution with a concentration of 4% into the container until the bamboo fiber is just submerged, then start stirring, stop stirring after stirring for 5 hours, turn off vacuuming, and after the pressure in the container returns to normal pressure, open the pressurization valve , to increase the pressure in the container to 2 atmospheres, keep the pressure constant, start stirring, stop stirring after 5 hours of stirring, and return the pressure in the container to normal pressure; open the valve at the bottom of the pressure container, and after l...

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PUM

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Abstract

The invention discloses a pretreatment method of bamboo fibers for direct nitrification, and belongs to the technical field of pyrotechnic composition preparation. The pretreatment method comprises the following steps of: putting the bamboo fibers into a pressure container with stirring and heating functions, vacuumizing and heating the container at the same time, keeping the vacuum degree unchanged, and performing heat preservation; injecting a lithium carbonate solution until the bamboo fibers are just immersed, performing stirring, stopping vacuumizing, opening a pressurizing valve after the pressure is recovered to normal pressure, increasing the pressure to 1-5 barometric pressures, and recovering the pressure in the container to normal pressure after performing stirring; after discharging the lithium carbonate solution, sealing and vacuumizing the container, and increasing the temperature in the container and performing heat preservation; discharging liquid in the pressure container; injecting water into the container, performing stirring, and discharging the water; detecting the pH value until the detected pH value of the discharged water is within the range of 6-7; and stopping heating, at the moment, completing the pretreatment of bamboo cellulose so as to make the bamboo cellulose directly used for nitrification. The method can effectively loosen the crystal structureof the bamboo cellulose, thereby effectively enhancing the direct nitrification efficiency of the bamboo fibers.

Description

technical field [0001] The invention relates to a pretreatment method of bamboo fiber for direct nitration, and belongs to the technical field of pyrotechnics preparation. Background technique [0002] Bamboo nitrocellulose is made from bamboo cellulose through nitration of nitric acid mixed with sulfuric acid. It belongs to nitrate esters and is another source of nitrocellulose after nitrocellulose. Nitrocellulose has two major application fields, military and civilian. The one with high nitrogen content is used to make single-base medicine, smokeless gunpowder, and fireworks; the one with low nitrogen content is used to make spray paint, artificial leather, film, plastic, etc. my country is a big bamboo producing country in the world and has abundant bamboo resources, so nitrocellulose has a very broad production prospect. [0003] Bamboo cellulose, the main raw material of nitrobamboo cellulose, comes from bamboo and needs to go through three steps: preparing bamboo fibe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/22
CPCD21C3/02D21C3/22
Inventor 刘吉平吉伟生于保藏李琪军刘克普周耀明
Owner 江西吉润花炮新材料科技有限公司
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