CN211142247U - Device for washing polyvinyl alcohol fibers at low temperature - Google Patents
Device for washing polyvinyl alcohol fibers at low temperature Download PDFInfo
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- CN211142247U CN211142247U CN201921694794.0U CN201921694794U CN211142247U CN 211142247 U CN211142247 U CN 211142247U CN 201921694794 U CN201921694794 U CN 201921694794U CN 211142247 U CN211142247 U CN 211142247U
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- polyvinyl alcohol
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Abstract
The utility model discloses a device of low temperature washing polyvinyl alcohol fibre, include: the device comprises an electrolytic cell, positive electrode plates and negative electrode plates, wherein the positive electrode plates and the negative electrode plates are arranged on two sides of the electrolytic cell, polyvinyl alcohol fibers penetrate through positions between the positive electrode plates and the negative electrode plates, reaction waste outlets are arranged on two sides of the electrolytic cell, and an air outlet is arranged at the upper end of the electrolytic cell; the utility model discloses a set the washing pond to the electrolytic bath, discharge the fibrous residue of polyvinyl alcohol by gas outlet and reaction waste outlet through electrolytic reaction, hydrolysis for the requirement is low to the temperature, makes polyvinyl alcohol fibre production conversion high.
Description
Technical Field
The utility model relates to a polyvinyl alcohol fibre production technology field, especially a device of low temperature washing polyvinyl alcohol fibre.
Background
The coagulating bath for wet spinning of polyvinyl alcohol includes inorganic salt aqueous solution, NaOH aqueous solution and organic solvent, and Na is most widely used2SO4An aqueous solution.
In the production process of polyvinyl alcohol, byproducts are difficult to completely remove, most commonly CH3COONa remains.
The post-processing of the polyvinyl alcohol fibers generally comprises the procedures of stretching, heat setting, water washing, oiling, drying and the like. The washing temperature is 70-80 ℃, because the washing can effectively remove CH attached to the fiber at the temperature3COONa and CH3COONa is washed away, and the normal temperature water is washed with CH3COONa and CH3COONa causes poor solubility, resulting in CH attached to the fiber3COONa and CH3COONa is not easy to be washed off, and the washing effect is not good. The water washing with normal temperature water needs to increase the washing time and the washing water amount, thereby wasting a large amount of water resources.
In the process of producing polyvinyl alcohol fibers by wet spinning, the temperature corresponding to a semi-finished product when the semi-finished product generates a certain shrinkage rate in hot water is measured, and the method is called an in-water softening point measurement method and is also called an RP value. When the RP value is lower than 70 ℃, part of the structure of the polyvinyl alcohol fiber begins to dissolve into water during water washing, so that the yield is reduced; when the RP value is less than 65 ℃, the amount of the polyvinyl alcohol fiber partial structure dissolved in water increases, and the production is difficult.
Therefore, the washing temperature and the RP value of the polyvinyl alcohol fiber have close relationship. When the RP value is low, the washing temperature of the polyvinyl alcohol fiber is also reduced, the washing effect is poor, the washing water consumption is high, and the yield of the polyvinyl alcohol fiber is low; when the RP value is high, the washing temperature of the polyvinyl alcohol fiber can be increased, the washing effect is good, the water consumption for washing is low, and the yield of the polyvinyl alcohol fiber is high.
The market needs a washing device which has low requirement on temperature and improves the production conversion rate of polyvinyl alcohol fibers, and the utility model solves the problems.
SUMMERY OF THE UTILITY MODEL
For solving prior art's not enough, the utility model aims to provide a fibrous device of low temperature washing polyvinyl alcohol through setting the washing pond to the electrolytic bath, discharges the fibrous residue of polyvinyl alcohol by gas outlet and reaction waste outlet through electrolytic reaction, hydrolysis reaction, requires lowly to the temperature for polyvinyl alcohol fibre production conversion is high.
In order to achieve the above object, the utility model adopts the following technical scheme:
the device for washing the polyvinyl alcohol fiber at low temperature comprises an electrolytic cell, positive electrode plates and negative electrode plates, wherein the positive electrode plates and the negative electrode plates are arranged on two sides of the electrolytic cell, the polyvinyl alcohol fiber penetrates through the position between the positive electrode plates and the negative electrode plates, reaction waste outlets are arranged on two sides of the electrolytic cell, and an air outlet is arranged at the upper end of the electrolytic cell.
The device for washing the polyvinyl alcohol fiber at low temperature further comprises: and the polyvinyl alcohol fiber conveying assembly is arranged between the positive electrode plate and the negative electrode plate.
The device for washing the polyvinyl alcohol fiber at low temperature comprises a polyvinyl alcohol fiber conveying assembly: squeeze rollers arranged at the front and rear positions of the upper end of the electrolytic cell, and guide rollers arranged in the electrolytic cell and positioned between the positive electrode plate and the negative electrode plate.
In the device for washing the polyvinyl alcohol fiber at low temperature, two guide rollers are provided.
In the device for washing the polyvinyl alcohol fibers at the low temperature, the inclined slope is arranged between the reaction waste outlet and the polyvinyl alcohol fibers.
In the device for washing the polyvinyl alcohol fiber at the low temperature, the inclination angle of the inclined slope is 45 °
A method for washing polyvinyl alcohol fiber at low temperature is characterized by comprising the following steps:
an air outlet is arranged on the electrolytic cell, and reaction waste outlets are arranged on two sides of the lower end of the electrolytic cell;
injecting water with the temperature range of 40-55 ℃ from a water injection port of the electrolytic cell, then enabling the polyvinyl alcohol fiber to pass through a space between the positive electrode plate and the negative electrode plate, opening the electrolytic cell, and introducing direct current, wherein the direct current voltage range is 1.23-300V;
the reaction waste flows out from a reaction waste outlet, and the washed polyvinyl alcohol fiber is dried; the reaction waste comprises: sodium sulfate, sodium acetate, sodium hydroxide, acetic acid, sulfuric acid.
In the method for washing the polyvinyl alcohol fiber at low temperature, the direct current voltage range is 15-25V.
The utility model discloses an useful part lies in:
the utility model promotes the electrolysis of sodium acetate and sodium sulfate by introducing direct current; discharging electrolysis products of the sodium hydroxide, the sodium acetate and the sodium sulfate and sulfuric acid by utilizing the characteristic that the density of the sodium hydroxide, the sodium acetate, the sodium sulfate and the sulfuric acid is increased along with the reduction of the temperature and utilizing the inclination of a washing tank; thereby improving the conversion rate of the polyvinyl alcohol fiber production; the washing temperature of the polyvinyl alcohol fiber is reduced, and energy is saved;
the washing effect of sodium sulfate and sodium acetate in the production process of polyvinyl alcohol fibers is improved, and the residues of the sodium sulfate and the sodium acetate in the polyvinyl alcohol fibers are reduced;
the continuous production reduces the water consumption, and greatly reduces the water consumption of the washing procedure of the polyvinyl alcohol fiber.
Drawings
Fig. 1 is a cross section of an embodiment of the invention;
fig. 2 is a longitudinal section of an embodiment of the invention.
The meaning of the reference symbols in the figures:
the device comprises an electrolytic cell 1, a positive electrode plate 2, a negative electrode plate 3, an air outlet 4, a squeezing roller 5, a guide roller 6, polyvinyl alcohol fibers 7, a reaction waste outlet 8, an inclined slope 9 and a water injection port 10.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
A device for washing polyvinyl alcohol fibers at low temperature comprises an electrolytic cell 1, positive electrode plates 2 and negative electrode plates 3 which are arranged on two sides of the electrolytic cell 1, polyvinyl alcohol fibers 7 which penetrate through the positions between the positive electrode plates 2 and the negative electrode plates 3, reaction waste outlets 8 arranged on two sides of the electrolytic cell 1, an air outlet 4 arranged at the upper end of the electrolytic cell 1, and a polyvinyl alcohol fiber conveying assembly arranged between the positive electrode plates 2 and the negative electrode plates 3.
The polyvinyl alcohol fiber conveying component comprises: squeeze rollers 5 provided at front and rear positions of the upper end of the electrolytic cell 1, and guide rollers 6 provided in the electrolytic cell 1 and located between the positive electrode plate 2 and the negative electrode plate 3. As shown in fig. 1, there are two guide rollers 6.
Ionization and electrolysis of sodium acetate
1. Ionization of sodium acetate
CH3COONa＝CH3COO-+Na+
2. Electrolysis of sodium acetate
3. Hydrolysis of sodium acetate
CH3COO-+H2O＝CH3COOH+OH-
4. Electrolysis of sodium acetate
II, ionization and electrolysis of sodium sulfate:
1、Na2SO4ionization of aqueous solutions
Na2SO4＝2Na++SO4 2-
H2O reversible symbol H++OH-
2. Electrolysis of sodium sulphate
Cathode: 4H++4e-→2H2↑
Anode: 4OH-→2H2O+O2↑+4e-
In order to facilitate the reaction waste to leave the electrolytic cell 1 quickly, an inclined slope 9 is arranged between the reaction waste outlet 8 and the polyvinyl alcohol fiber; preferably, the inclination angle of the inclined slope 9 is 45 °
A method for washing polyvinyl alcohol fiber at low temperature comprises the following steps:
an air outlet 4 is arranged on the electrolytic cell 1, and reaction waste outlets 8 are arranged on two sides of the lower end of the electrolytic cell 1;
injecting water with the temperature of 40-55 ℃ from a water injection port 10 of the electrolytic cell 1, and then enabling the polyvinyl alcohol fiber to pass through the positive electrode plate
2. Opening the electrolytic cell 1 in the space between the negative electrode plates 3, and introducing direct current with the direct current voltage range of 1.23-300V;
preferably, the DC voltage is in the range of 15-25 volts.
The reaction waste flows out from a reaction waste outlet 8, and the washed polyvinyl alcohol fiber is dried; the reaction waste material from the vicinity of the positive plate includes: sodium sulfate, sodium acetate, sodium hydroxide, acetic acid, sulfuric acid.
The experiment below delta proves that the device and the method of the utility model can improve the conversion rate of the polyvinyl alcohol fiber production;
1 range
Sodium acetate content is determined by chemical titration or conductivity. Additives interfere and therefore, these methods are not suitable for polyvinyl alcohol materials containing additives.
2.1 titration method
The sample is dissolved in water, a mixed solution of methylene blue and dimethyl yellow is used as an indicator, hydrochloric acid is used for titration, and then the content of sodium acetate is calculated.
3 titration method
3.1 reagents
3.1.1 hydrochloric acid standard titration solution c (hcl) o.1mol/L.
3.1.2 Methyleneblue-dodecamethylyellow mixed indicator: 1:1.
Note: both the methylene blue and the dimethyl yellow are 0.1% ethanol solutions.
3.2 instruments
3.2.1 Erlenmeyer flask: 500m L with stopper.
3.2.2 graduated cylinder: 200m L, index value 2m L.
3.2.3 burette 50m L, division 0.1m L.
3.3 operating procedure
About 5g of sample was weighed to 0.001g in 3.3.1, and the sample was put into a Erlenmeyer flask, added with 200m L of water, and dissolved by heating.
3.3.2 after the sample is dissolved, cooling, adding 15 to 20 drops of a mixed indicator of methylene blue and dimethyl yellow, and then titrating by using a 0.1 mol/L hydrochloric acid standard titration solution to the end point, wherein the color of the solution is changed from green to light purple, and performing a blank test.
Note: samples with low alcoholysis may sometimes make the solution cloudy. Once this occurs, the solution is slowly cooled with gentle stirring or the aqueous solution is replaced with a 3:1 water/methanol mixture.
3.3.4 results show
The sodium acetate content is calculated as mass fraction NaAc, the value is expressed in% and is calculated according to the formula:
in the formula:
u 1-number of volumes of standard titration solution of hydrochloric acid consumed by titrating a sample in milliliters (m L);
u 0-number of volumes of standard titration solutions of hydrochloric acid consumed for titration of blanks in milliliters (m L);
c is the accurate value of the concentration of the hydrochloric acid standard titration solution, and the unit is mol per liter (mol/L);
0.08203-the molar mass of sodium acetate divided by 1000 in grams per mole (g/mol);
m is a number of the mass of the sample in grams (g).
The arithmetic mean of the results of the two determinations was calculated and the results were retained up to 2 decimal places.
Note: if sodium hydroxide is present in the sample, attention should be paid to its effect on the determination of sodium acetate content; however, the effect of sodium hydroxide on the determination of sodium acetate content was not taken into account when sodium acetate was used for ash calculation.
5 test report
a) The experimental method in the experimental report is according to GB/T12010.2;
b) the test sample is the polyvinyl alcohol fiber after the method of the utility model is washed.
c) The measurement result is 0.14%;
d) the results of the individual measurements were 0.14%, 0.13%, 0.15%, and 0.13%.
Subject matter and scope of application
And (4) measuring the content of sodium sulfate in the polyvinyl alcohol fiber.
2 test method
2.1 instrumentation
Beaker (250ml)
Graduated pipette (2ml)
Acid burette (5ml)
Measuring slip (10ml)
Pipette (25ml)
Measuring cup (10ml)
2.2 use of reagents
(EDTA) ═ 0.1 mol/L EDTA solution
Luohai T concentrated hydrochloric acid
BaCl2/MgCl2 mixed liquor
2.3 principle of measurement
Adding excessive mixed solution of barium oxide and magnesium chloride to make sulfate radical produce barium sulfate precipitate, titrating the excessive barium ion with EDTA in the presence of proper amount of magnesium ion, reacting the sulfate radical combined with calcium and magnesium in the solution with barium salt to produce barium sulfate precipitate, and dissociating to obtain ion, with equivalent calcium and magnesium ion being complexed with equivalent EDTA during titration.
2.4 test methods
2 g of polyvinyl alcohol fiber is taken and placed in a 250m beaker, about 150ml of water is added, the mixture is placed on an electric furnace and boiled, 5 drops of concentrated hydrochloric acid are added, the mixture is carefully stirred and 25ml of barium chloride-magnesium chloride mixture is added, then the mixture is kept on the electric furnace for 5 minutes, the mixture is taken down and cooled to room temperature, 10m of pH 10 buffer solution and 4-5 drops of complexing black T indicator are added, then C (EDTA) -0.1 ml/L EDTA standard is used for dropping until pure blue is used as an end point, the consumption ml of C (EDTA) -0.1 mol/L EDTA standard solution is recorded as a, and the consumption ml of C EDTA) -0.1 mol/L EDTA standard is recorded as b in a blank test.
2.5 calculation of
In the formula: 1.449 is NaSO4：H2SO4The ratio of (A) to (B);
1M Na2SO4represents Na2SO4Has a molecular weight of 142.06.
3, results:
a) the test sample is the polyvinyl alcohol fiber after the water washing by the method of the utility model;
b) the determination result is 0.0063%;
c) the results of the individual measurements were 0.0063%, 0.006%, 0.0064% and 0.0063%.
According to experiments, the method of the utility model can well remove the residual sodium acetate and sodium sulfate of the polyvinyl alcohol fiber.
The utility model promotes the electrolysis of sodium acetate and sodium sulfate by introducing direct current; discharging electrolysis products of the sodium hydroxide, the sodium acetate and the sodium sulfate and sulfuric acid by utilizing the characteristic that the density of the sodium hydroxide, the sodium acetate, the sodium sulfate and the sulfuric acid is increased along with the reduction of the temperature and utilizing the inclination of a washing tank; thereby improving the conversion rate of the polyvinyl alcohol fiber production; the washing temperature of the polyvinyl alcohol fiber is reduced, and energy is saved; the washing effect of sodium sulfate and sodium acetate in the production process of polyvinyl alcohol fibers is improved, and the residues of the sodium sulfate and the sodium acetate in the polyvinyl alcohol fibers are reduced; the continuous production reduces the water consumption, and greatly reduces the water consumption of the washing procedure of the polyvinyl alcohol fiber.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.
Claims (6)
1. The device for washing the polyvinyl alcohol fibers with the low temperature is characterized by comprising an electrolytic cell, positive electrode plates and negative electrode plates, wherein the positive electrode plates and the negative electrode plates are arranged on two sides of the electrolytic cell, the polyvinyl alcohol fibers penetrate through positions between the positive electrode plates and the negative electrode plates, reaction waste outlets are arranged on two sides of the electrolytic cell, and an air outlet is arranged at the upper end of the electrolytic cell.
2. The apparatus of claim 1, further comprising: and the polyvinyl alcohol fiber conveying assembly is arranged between the positive electrode plate and the negative electrode plate.
3. The apparatus of claim 2, wherein the polyvinyl alcohol fiber conveying assembly comprises: squeeze rollers arranged at the front and rear positions of the upper end of the electrolytic cell, and guide rollers arranged in the electrolytic cell and positioned between the positive electrode plate and the negative electrode plate.
4. The apparatus for low temperature water washing of polyvinyl alcohol fiber according to claim 3, wherein there are two guide rollers.
5. The apparatus for washing polyvinyl alcohol fiber with water at low temperature according to claim 1, wherein an inclined slope is provided between the reaction waste outlet and the polyvinyl alcohol fiber.
6. The apparatus for low-temperature water washing of polyvinyl alcohol fibers according to claim 5, wherein the inclined slope is inclined at an angle of 45 °.
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| CN201921694794.0U CN211142247U (en) | 2019-10-11 | 2019-10-11 | Device for washing polyvinyl alcohol fibers at low temperature |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578178A (en) * | 2019-10-11 | 2019-12-17 | 振德医疗用品股份有限公司 | device and method for washing polyvinyl alcohol fibers at low temperature |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578178A (en) * | 2019-10-11 | 2019-12-17 | 振德医疗用品股份有限公司 | device and method for washing polyvinyl alcohol fibers at low temperature |
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