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Continuous nitrocotton dewatering process and apparatus

A technology of nitrocellulose and nitrocellulose pulp, which is applied in the field of water-displacement technology and devices, can solve problems such as inability to continuously displace water, achieve the effects of improving working environment and conditions, reducing labor intensity, and reducing product costs

Inactive Publication Date: 2005-06-29
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

[0042] 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:

[0043] ①The nitrocellulose slurry enters the dehydrated cotton tank, and the cotton pulp concentration is adjusted, and the cotton pulp concentration is (9±1)%;

[0044] ②The nitrocellulose slurry is pumped into the two-stage piston pusher centrifuge for dehydration by the metering pump for dehydration, and 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 dehydration Use metering pump speed (750±25)r / min;

[0045] ③ After the dehydration, the moisture content of the nitrocellulose is ≤29%. ±3)%;

[0046] ④ The wine cotton is pumped into the two-stage piston pusher centrifuge for water displacement by the metering pump for water displacement, and the alcohol is replaced by water displacement, an...

Embodiment 2

[0047] 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:

[0048] ①The nitrocellulose slurry enters the dehydrated cotton tank, and the cotton pulp concentration is adjusted, and the cotton pulp concentration is (8±1)%;

[0049] ②The nitrocellulose slurry is pumped into the two-stage piston pusher centrifuge for dehydration by the metering pump for dehydration, and the dehydration speed is controlled by the frequency converter and the metering pump for dehydration. Metering pump speed (600±25)r / min;

[0050] ③ After the dehydration, the moisture content of the nitrocellulose is ≤29%. ±3)%;

[0051] ④ The wine cotton is pumped into the two-stage piston pusher centrifuge for water displacement by the metering pump for water displacement, and the alcohol is replaced by water displacement, and the metering pump is regulated by the frequency co...

Embodiment 3

[0052] 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:

[0053] ①The nitrocellulose slurry enters the dehydrated cotton tank, and the cotton pulp concentration is adjusted, and the cotton pulp concentration is (6±1)%;

[0054] 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. Metering pump speed (800±25)r / min;

[0055] ③ After dehydration, the moisture content of the nitrocellulose is ≤29%. ±3)%;

[0056] ④ The wine cotton is pumped into the two-stage piston pusher centrifuge for water displacement by the metering pump for water displacement, and the alcohol is replaced by water displacement, and the metering pump i...

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Abstract

The invention discloses a process and device for continuous water displacement of nitrocellulose. The continuous water displacement of nitrocellulose can be realized by using the method. The invention comprises the following process steps: ① nitrocellulose slurry enters the dehydration cotton tank; ② adjusts the concentration of nitrocellulose in the dehydration cotton tank; ③ the nitrocellulose slurry is pumped into the dehydration pusher centrifuge for dehydration by a metering pump for dehydration; ④ The water content of the dehydrated nitrocellulose is ≤29%, and the cutting material falls into the wine cotton tank and soaked with concentrated alcohol; ⑤Adjust the concentration of nitrocellulose in the wine cotton tank; The pusher centrifuge carries out alcohol replacement and water displacement. In the present invention, the two-stage piston pusher centrifuge used for dehydration and water displacement is a two-stage piston pusher centrifuge, the metering pump is selected from NM90SY02S08V Naimo pump, and the alcohol nozzle in the water-displacement double-stage piston pusher centrifuge is a gap type The flat nozzle and the mechanical seal port of the front bearing of the two-stage piston pusher centrifuge for water driving are connected to the nitrogen input pipe, and nitrogen gas with a pressure of 0.2-0.3 MPa is fed into the mechanical seal during the water driving process. The invention has the characteristics of reliable process and stable product quality, and can meet the quality and safety requirements of nitrocellulose production.

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 range of the cotton layer is as high as 4%, and the input and consumption of water-dispelling alcohol are relatively large, and the production cycle is relatively large. Long, many material transfer links, high labor intensity, and many operators....

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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