Wood pulp nitrocotton production method

A production method and technology of nitrocellulose, which is applied in the field of wood pulp nitrocellulose production, can solve the problems of high pressure on environmental protection of refined cotton wastewater, large steam consumption, high fuel consumption, etc., achieve good product quality uniformity, reduce environmental pollution, Effect of reducing waste water discharge

Inactive Publication Date: 2012-01-18
SICHUAN NITROCELLULOSE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the steam consumption in the refined cotton production process is large (1.4t / tNC), the fuel consumption is high, and a large amount of refined cotton wastewater (120 tons / tRC) will be generated. The environmental protection management pressure is high, and the cost of producing nitrocellulose with refined cotton as raw material Relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The slicer slices the wood continuously (11 kg / min), the mixed acid flow rate is 8m 3 / h, and the nitrification temperature was 28°C for 23 minutes. In the mixed acid, the nitric acid is 21%, the moisture is 9%, and the balance is sulfuric acid by mass fraction. The waste acid is separated by a centrifugal acid drive machine to obtain acid wood pulp nitrocellulose.

[0024] When acid wood pulp and nitrocellulose are boiled and washed, add water to adjust the initial acidity to 0.7g / l, boil and wash at 112°C for 4.8 hours, and then cold wash for 65 minutes (long flow cold wash);

[0025] The feeding time of the dehydration (water driving) machine is 1.2 minutes, the loading capacity of each sieve is controlled to 129 kg, and the dehydration time is 1.5 minutes. The moisture content of the product after dehydration is 34%.

[0026] Add 1.2 liters of alcohol per kilogram of wood pulp nitrocellulose during the water driving process, and the water driving time is 3.2 minu...

Embodiment 2

[0029] The slicer slices the wood continuously (15 kg / min), the mixed acid flow rate is 15m 3 / h, and the nitrification temperature was 38°C for 48 minutes. In the mixed acid, nitric acid is 32%, moisture is 12%, and the balance is sulfuric acid by mass fraction. Acid wood pulp nitrocellulose is obtained by separating waste acid through a centrifugal acid drive machine.

[0030] When boiling and washing, add water to adjust the initial acidity to 4g / l, boil and wash at 134°C for 3.5 hours, and then cold wash for 38 minutes after boiling (long flow cold wash);

[0031] The feeding time of the dehydration (water driving) machine is 2.9 minutes, the loading capacity of each sieve is controlled to 182 kg, and the dehydration time is 5 minutes. The moisture content of the product after dehydration is 31%.

[0032] Add alcohol 1.7 liters / kg wood pulp nitrocellulose in the water driving process, and the water driving time is 8 minutes. Control the wetting agent content of wood pu...

Embodiment 3

[0035] The slicer slices the wood continuously (27 kg / min), the mixed acid flow rate is 7m 3 / h, the nitrification temperature is 56°C. Reaction 60min. In the mixed acid, by mass fraction, nitric acid is 50%, water is 15%, and the balance is sulfuric acid. Acid wood pulp nitrocellulose is obtained by separating waste acid through a centrifugal acid drive machine.

[0036] When boiling and washing, add water to adjust the initial acidity to 9g / l, boil and wash at 145°C for 2.7 hours, and then cold wash for 47 minutes after boiling (long flow cold wash);

[0037] The feeding time of the dehydration (water driving) machine is 4.6 minutes, the loading capacity of each sieve is controlled to 193 kg, and the dehydration time is 6 minutes. The moisture content of the product after dehydration is 30%.

[0038] Add 1.5 liters of alcohol per kilogram of wood pulp nitrocellulose during the water driving process, and the water driving time is 12 minutes. Control the wetting agent con...

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Abstract

The invention belongs to the technical field of nitrocotton production methods, and in particular relates to a wood pulp nitrocotton production method. In the method, wood pulp is used as a raw material, the energy consumption in production is low, the production efficiency is high and the chroma of the product is low. The wood pulp nitrocotton production method comprises the following steps of: nitrifying wood, wherein mixed acid is a mixture of nitric acid, sulfuric acid and water, and the mixed acid comprises 20 to 55 mass percent of nitric acid, 10 to 18 mass percent of water and the balance of sulfuric acid; centrifugally driving acid to obtain acid wood pulp nitrocotton; boiling and washing the acid wood pulp nitrocotton; adding water to regulate the initial acidity to be 0.5-10g/l,and controlling the boiling and washing temperature to be 101-150DEG C; dehydrating; and driving water. The wastewater emission in the refined cotton production process is reduced, environmental pollution is lightened, and the aims of saving energy and reducing emission can be fulfilled.

Description

technical field [0001] The invention belongs to the technical field of production methods of nitrocellulose, in particular to a production method of wood pulp nitrocellulose. Background technique [0002] Cellulose nitrate, commonly known as nitrocellulose or nitrocellulose, is the product of the reaction between cellulose and nitric acid. It was originally used in the military field and is an important raw material for the manufacture of propellants, missiles, and rocket propellants; at the same time, cellulose nitrate has good Film-forming performance, can be used for surface coating of metal, wood and other materials, so it is widely used in civil industry, mainly used in the manufacture of various paints, typing stencils, inks, varnished cloth, bottle seals, adhesives, leather oil, Nail polish, ester-soluble or water-soluble paint, table tennis balls, piano keys and other products. [0003] At present, domestic nitrocellulose production uses refined cotton as raw materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B5/02
Inventor 张仁旭薛刚王维智程从勇陈绍文赵利斌张永长郭朝钢周邦友危涛
Owner SICHUAN NITROCELLULOSE CORP
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