CN112500501A - Method for removing water from low-moisture nitrocotton - Google Patents
Method for removing water from low-moisture nitrocotton Download PDFInfo
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- CN112500501A CN112500501A CN202011338705.6A CN202011338705A CN112500501A CN 112500501 A CN112500501 A CN 112500501A CN 202011338705 A CN202011338705 A CN 202011338705A CN 112500501 A CN112500501 A CN 112500501A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B5/00—Preparation of cellulose esters of inorganic acids, e.g. phosphates
- C08B5/02—Cellulose nitrate, i.e. nitrocellulose
- C08B5/04—Post-esterification treatments, e.g. densification of powders, including purification
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Abstract
The invention discloses a method for driving water by low-moisture nitrocotton, which comprises the following steps of 1, installing two dewaterers, dewatering the nitrocotton containing water by a first dewaterer, and soaking the nitrocotton after the first dewatering in light wine; step 2, conveying the soaked nitrocotton light wine into a second centrifugal machine for replacement, wine adding and water expelling; step 3, adjusting the blanking speed of the second dehydrator to finish water driving; the invention uses two P60 centrifuges to drive water continuously, which improves the water driving yield, and the consumption of alcohol is small in the water driving process, and the water of the product is stable and the uniformity is good.
Description
Technical Field
The invention belongs to the technical field of nitrocotton production and manufacturing, and relates to a method for dewatering low-moisture nitrocotton.
Background
Some special nitrocotton grades require extremely low moisture, the moisture requirement is less than 4.0%, generally only can finish water driving in a three-foot vertical centrifuge (Huada centrifuge), the moisture index is qualified, the three-foot vertical centrifuge has the defects of discontinuous feeding, low production efficiency, poor product uniformity and high alcohol input consumption, and the off-line moisture can only reach 4.5-4.8% and can not reach below 4.0% by using a conventional continuous water driving process, so that the requirements of special grade products can not be met; the nitrocotton water-driving packaging is the last link of nitrocotton production and manufacture, the advanced continuous water-driving (two P60 centrifuges are connected in series and water is driven by alcohol replacement) process is generally adopted at home at present, the requirement of the water content of the finished product after water driving can be generally controlled to about 6 percent, the water content of nitrocotton (such as soft cotton) of some special users and special purposes is required to be extremely low (below 4.0 percent), and the continuous water-driving process can not meet the requirement of extremely low water content.
Disclosure of Invention
The invention aims to provide a method for driving water by using low-moisture nitrocotton, which solves the problems of high alcohol consumption and time consumption in the existing water driving technology.
The technical scheme adopted by the invention is that a method for driving water by low-moisture nitrocotton is implemented according to the following steps:
step 1, installing two dewaterers, dewatering the water-containing nitrocotton through a first dewaterer, and then soaking the nitrocotton after primary dewatering in the light wine;
step 2, conveying the soaked nitrocotton light wine into a second centrifugal machine for replacement, wine adding and water expelling;
and 3, adjusting the blanking speed of the second dehydrator to finish water driving.
The invention is also characterized in that:
wherein the dehydrator in the step 1 is a P60 centrifuge;
wherein the concentration of the light wine in the step 1 is 65-75% (v/v), and the soaking time is 8-15 min;
wherein the wine adding amount in the step 2 is 1500-1700L/h;
wherein the blanking speed of the second dehydrator in the step 3 is 22-24 Kg/min.
The invention has the beneficial effects that:
according to the method for driving water by using the low-moisture nitrocotton, two P60 centrifuges are used for continuously driving water, the water driving yield is improved, the consumption of alcohol in the water driving process is low, the water of a product for continuously driving water is stable, the uniformity is good, and the production of the low-moisture product is solved.
Drawings
FIG. 1 is a process flow diagram of a continuous water-removing low-moisture product process of the water-removing method of the low-moisture nitrocotton.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a method for driving water by low-moisture nitrocotton, which comprises the following implementation steps of using two P60 centrifuges to drive water and package a 4.0% ultra-low-moisture product as shown in figure 1:
step 1, dehydrating nitrocotton by a first dehydrator, and soaking the nitrocotton in light wine, wherein the concentration of the light wine is controlled within 65-75% (v/v), the soaking time is not too long and is within 8-15 min, and nitrocotton with about 30% of water content is mixed and soaked with the light wine, so that subsequent continuous water removal is facilitated;
step 2, replacing, adding wine and driving water by a second centrifugal machine, wherein the wine adding amount is 1500-1700L/h, and the purpose is that high-concentration alcohol fully permeates, contacts and displaces the driving water;
step 3, controlling the appropriate blanking speed of the water drive machine, aiming at prolonging the retention time of cotton in the water drive machine (not the longer the time is, the better the time is, the longer the time is, the thickness of the cotton layer in the centrifugal machine is, but the water drive is not beneficial), controlling the blanking speed to be appropriate within the range of 22-24Kg/min, and realizing the blanking speed through the rotating speed of a cotton pump;
the water-driving centrifugal machine is cleaned before each production, the water-driving effect is better, the ultra-low moisture nitrocotton product which can only be driven by a large centrifugal machine or a three-leg centrifugal machine before is obtained after the operation, the production efficiency is high, and the alcohol consumption is low.
The prior art is compared with the technology of this application:
using a three-leg centrifuge (or Huada water-driving centrifuge) for discontinuous water driving, wherein the material charging (distributing) time of each centrifuge is 10 minutes, the dehydration time is 6 minutes, the alcohol adding time is 10 minutes, the water driving time is 15 minutes, the discharging time is 8-10 minutes, the total time is 49-51 minutes, the material charging amount of each centrifuge is 80 kilograms, the water driving yield of each centrifuge per hour is 96 kilograms, and if the three-leg centrifuge is used for discontinuously and manually subpackaging small cloth bags for water driving, the production efficiency is lower; when a three-leg centrifuge is used for driving water in the past, a batch of products is about 4 tons, and several shifts of production often need to be carried out for several days; under the condition of continuous feeding and water driving of a Huada water driving centrifugal machine, the same batch of 4 tons of products is produced, and one to two shifts (8 hours of work per shift) are needed; after the improved continuous water-driving process is used, the water-driving yield can reach more than 1440 kg/h, the labor efficiency is 15 times that of a three-leg centrifuge, and 2.88 times that of Huada centrifuge;
the alcohol input consumption is reduced greatly, the alcohol input of a tripodia centrifuge driving water per ton product is 2200-2500 liters, the alcohol input of a Huada centrifuge driving water per ton product is 1800-1900 liters, the alcohol input consumption of a continuous driving water process per ton product is 1146 liters, and the alcohol input consumption is reduced by about 57%;
the product of continuous water driving has stable water content and good uniformity, and other water driving processes (Huada centrifuge water driving or three-leg centrifuge water driving processes) have poor product uniformity due to multiple manual operation links, multiple equipment numbers, performance difference and other factors.
Claims (5)
1. A method for driving water by low-moisture nitrocotton is characterized by comprising the following steps:
step 1, using two dehydrators to dehydrate water-containing nitrocotton by a first dehydrator, and then soaking the primarily dehydrated nitrocotton in light wine;
step 2, conveying the soaked nitrocotton light wine into a second centrifugal machine for replacement, wine adding and water expelling;
and 3, adjusting the blanking speed of the second dehydrator to finish water driving.
2. The method for driving water by using low-moisture nitrocotton according to claim 1, wherein the dehydrator in the step 1 is a P60 centrifuge.
3. The method for driving water by using low-moisture nitrocotton as claimed in claim 1, wherein the concentration of the light wine in the step 1 is 65-75% (v/v), and the soaking time is 8-15 min.
4. The method for driving water by using low-moisture nitrocotton according to claim 1, wherein the wine adding amount in the step 2 is 1500-1700L/h.
5. The method for driving water by using low-moisture nitrocotton according to claim 1, wherein the blanking speed of the second dehydrator in the step 3 is 22-24 Kg/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011338705.6A CN112500501A (en) | 2020-11-25 | 2020-11-25 | Method for removing water from low-moisture nitrocotton |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011338705.6A CN112500501A (en) | 2020-11-25 | 2020-11-25 | Method for removing water from low-moisture nitrocotton |
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| CN112500501A true CN112500501A (en) | 2021-03-16 |
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| CN202011338705.6A Pending CN112500501A (en) | 2020-11-25 | 2020-11-25 | Method for removing water from low-moisture nitrocotton |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1436793A (en) * | 2003-03-21 | 2003-08-20 | 泸州北方化学工业有限公司 | Continuous nitrocotton dewatering process and apparatus |
| CN101830987A (en) * | 2010-04-30 | 2010-09-15 | 阜城县诚信纤维素有限公司 | Continuous dehydrating production process and device for nitro-cotton |
| CN103319611A (en) * | 2013-06-27 | 2013-09-25 | 南通泰利达化工有限公司 | Production process of 2000s/v nitrocotton |
| CN104744597A (en) * | 2015-04-21 | 2015-07-01 | 保定宝丰硝化棉有限公司 | Preparation method of high-viscosity solid alcohol nitro-cotton |
| CN104788574A (en) * | 2015-04-21 | 2015-07-22 | 保定宝丰硝化棉有限公司 | Preparation method of low-ash nitro-cotton for paint |
| CN106188312A (en) * | 2016-07-19 | 2016-12-07 | 南通泰利达化工有限公司 | A kind of production technology of 300 seconds degree nitrocottons |
-
2020
- 2020-11-25 CN CN202011338705.6A patent/CN112500501A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1436793A (en) * | 2003-03-21 | 2003-08-20 | 泸州北方化学工业有限公司 | Continuous nitrocotton dewatering process and apparatus |
| CN101830987A (en) * | 2010-04-30 | 2010-09-15 | 阜城县诚信纤维素有限公司 | Continuous dehydrating production process and device for nitro-cotton |
| CN103319611A (en) * | 2013-06-27 | 2013-09-25 | 南通泰利达化工有限公司 | Production process of 2000s/v nitrocotton |
| CN104744597A (en) * | 2015-04-21 | 2015-07-01 | 保定宝丰硝化棉有限公司 | Preparation method of high-viscosity solid alcohol nitro-cotton |
| CN104788574A (en) * | 2015-04-21 | 2015-07-22 | 保定宝丰硝化棉有限公司 | Preparation method of low-ash nitro-cotton for paint |
| CN106188312A (en) * | 2016-07-19 | 2016-12-07 | 南通泰利达化工有限公司 | A kind of production technology of 300 seconds degree nitrocottons |
Non-Patent Citations (2)
| Title |
|---|
| 刘锡朋 等: ""基于真空热脱水工艺的硝化棉自动高效脱驱水生产线"", 《兵工自动化》 * |
| 王维慧 等: ""精制棉脱水工艺技术改进"", 《四川理工学院学报(自然科学版)》 * |
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Application publication date: 20210316 |
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