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Continuous nitrocotton dewatering process and apparatus

A nitrocellulose and water-displacement technology, applied in the field of water-displacement technology and devices, can solve problems such as inability to continuously displace water, and achieve the effects of improved working environment and conditions, good reproducibility, and reliable technology

Inactive Publication Date: 2003-08-20
SICHUAN NITROCELLULOSE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency that the existing nitrocellulose flooding process cannot continuously drive water, the present invention provides a continuous water flooding process and a device for implementing the process

Method used

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  • Continuous nitrocotton dewatering process and apparatus
  • Continuous nitrocotton dewatering process and apparatus
  • Continuous nitrocotton dewatering process and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 is that the method of the present invention is used to produce the coating nitrocellulose of 1 / 4 second grade, and its process step and parameter are as follows:

[0042] ①The nitrocellulose slurry enters the dehydrated cotton tank, and the cotton pulp concentration is adjusted, and the cotton pulp concentration is (9±1)%;

[0043] ②The nitrocellulose slurry is poured into the double-stage piston pusher centrifuge for dehydration by the metering pump for dehydration. The dehydration speed is controlled by the frequency converter and the metering pump for dehydration. The dehydration speed is (35±2%) Kg / min, and the metering Pump speed (750±25)r / min;

[0044] ③ After the dehydration, the moisture content of the nitrocellulose is ≤29%. ±3)%;

[0045] ④The wine cotton is pumped into the water by the metering pump, and the two-stage piston pusher centrifuge is used to replace the alcohol with water, and the metering pump is controlled by the frequency converter...

Embodiment 2

[0046] Embodiment 2 is that the method of the present invention is used to produce the nitrocellulose for the coating of 1 / 2 second grade, and its processing steps and parameters are as follows:

[0047] ①The nitrocellulose slurry enters the dehydrated cotton tank, and the cotton pulp concentration is adjusted, and the cotton pulp concentration is (8±1)%;

[0048] ②The nitrocellulose slurry is pumped into the two-stage piston pusher centrifuge for dehydration by the metering pump for dehydration. The dehydration speed is controlled by the frequency converter and the metering pump for dehydration. The dehydration speed is (33±2)Kg / min, and the metering pump for dehydration Speed ​​(600±25)r / min;

[0049] ③ After the dehydration, the moisture content of the nitrocellulose is ≤29%. ±3)%;

[0050] ④The wine cotton is pumped into the water by the metering pump, and the two-stage piston pusher centrifuge is used to replace the alcohol with water, and the metering pump is controlle...

Embodiment 3

[0051] Embodiment 3 is that the method of the present invention is used to produce the nitrocellulose for the coating of 30 seconds grade, and its processing steps and parameters are as follows:

[0052] ①The nitrocellulose slurry enters the dehydrated cotton tank, and the cotton pulp concentration is adjusted, and the cotton pulp concentration is (6±1)%;

[0053] ②The nitrocellulose slurry is pumped into the two-stage piston pusher centrifuge for dehydration by the metering pump for dehydration. The dehydration speed is controlled by the frequency converter and the metering pump for dehydration. The dehydration speed is (30±2)Kg / min, and the metering pump for dehydration Speed ​​(800±25)r / min;

[0054] ③ After dehydration, the moisture content of the nitrocellulose is ≤29%. ±3)%;

[0055] ④The wine cotton is pumped into the water by the metering pump, and the two-stage piston pusher centrifuge is used to replace the alcohol with water, and the metering pump is controlled by...

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Abstract

The present invention is continuous nitrocotton dewatering process and apparatus. The continuous nitrocotton dewatering process includes the technological steps of: feeding nitrocotton slurry into dewatering tank; regulating the density of nitrocotton slurry; pumping nitrocotton slurry with metering pump into centrifugal machine to dewatering; soaking with alcohol the dewatered nitrocotton with water content less than 29%; regulating the density of nitrocotton in soaking alcohol tank; pumping alcohol soaked nitrocotton with metering pump into water displacing centrifugal machine for replacing water with alcohol. In the dewatering and water-replacing process, double-stage piston material-pushing centrifugal machine and Neihm pump are used, and during displacing water nitrogen of 0.2-0.3 MPa pressure is introduced into mechanical sealing.

Description

Technical field [0001] The invention relates to a water-displacement process and device, in particular to a continuous water-displacement process and device for nitrocellulose. Background technique [0002] In the production of nitrocellulose, the existing process is to use an intermittent three-legged centrifuge to drive water, and the dehydrated nitrocellulose is completely manually transferred, sieved, water driven, and sieved to complete a sieve of water. Production, and then carry out the water displacement of the next sieve, and continuous water displacement cannot be realized. The water alcohol and water content of the nitrocellulose produced are extremely uneven and fluctuate greatly, especially the inner, middle and outer ranges of the cotton layer are as high as 4%. The cycle is long, there are many material transfer links, the labor intensity is high, and there are many operators. Intermittent water flooding is basically an open production operation, the alcohol...

Claims

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Application Information

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IPC IPC(8): C08B5/02
Inventor 陈绍文张仕明赵强先赵其林姚鲁薛刚蔺志强赵利斌张仁旭
Owner SICHUAN NITROCELLULOSE CORP
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