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Continuous multi-stage acid flooding displacement washing process

A technology of replacement washing and process method, applied in the direction of washing/replacement of pulp treatment liquid, etc., can solve the problem of low residual acidity of acid cotton, and achieve the effect of reducing decomposition frequency, ensuring stable operation and improving quality

Active Publication Date: 2021-05-07
SICHUAN NITROCELLULOSE CORP
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: on the premise that the residual acidity of acid cotton can be lowered, a continuous multi-stage acid displacement washing process with simpler process flow and better economic efficiency can be provided, which can reduce the production of nitric acid from nitrocellulose , sulfuric acid consumption, and at the same time ensure a high concentration of waste acid for replacement and washing, which is convenient for the recovery and concentration of waste acid

Method used

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  • Continuous multi-stage acid flooding displacement washing process
  • Continuous multi-stage acid flooding displacement washing process
  • Continuous multi-stage acid flooding displacement washing process

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] Such as image 3 As shown, the process flow of the present invention is that the acid cotton mixture after the nitration reaction enters the horizontal pusher centrifuge for acid cotton separation, and the sieve plate of the horizontal pusher centrifuge includes a high-concentration waste acid separation section and a replacement washing section , Carry out five stages of countercurrent displacement washing in the displacement washing section. If the number of washing stages is too small, the number of washings will decrease, and the residual acidity after washing will increase correspondingly; if the number of washing stages is too large, it will be difficult to control the balance of the displacement acid in and out of each stage, and it is not convenient for production control. Therefore, the present invention adopts five stages of countercurr...

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Abstract

The invention relates to a continuous multi-stage acid displacement washing process, which belongs to the technical field of nitrocellulose displacement technology. In the present invention, the acid cotton mixture after the nitration reaction is put into a horizontal pusher centrifuge for acid cotton separation. The sieve plate of the horizontal pusher centrifuge includes a high-concentration waste acid separation section and a replacement washing section. Segment countercurrent displacement washing. The invention adopts a five-stage countercurrent displacement washing process, and the residual acidity of the acid cotton after acid displacement is controlled to be below 8%, and the residual acidity is greatly reduced compared with the traditional three-stage acid displacement process, and the concentration of the final washing waste acid is relatively high. The nitric acid content is 18% to 22%, and the sulfur content is 47% to 53%, which is convenient for the separation and concentration of waste acid.

Description

technical field [0001] The invention relates to a continuous multi-stage acid displacement washing process, which belongs to the technical field of nitrocellulose displacement technology. Background technique [0002] The acid displacement washing process in the production process of nitrocellulose is the key step to realize the separation of acid and cotton solid-liquid, and has a decisive effect on the consumption level of nitric acid and sulfuric acid in the production of nitrocellulose. The traditional washing process for acid displacement of nitrocellulose usually includes: ①The acid cotton mixture after the nitration reaction enters the bedroom pusher centrifuge to separate the acid cotton, and then sends it to the subsequent cooking and washing section for stabilization treatment and viscosity adjustment. Such processes exist The problem mainly has two aspects, one is that the residual acidity of the acid cotton after acid flooding is about 30% to 40%, the acid consum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B5/02
CPCD21C9/06
Inventor 张仁旭熊仕明邱清海薛刚张尧曹磊张朝俊唐彬涂文军何春体
Owner SICHUAN NITROCELLULOSE CORP
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