CN116510356A - Defoaming method of cellulose fiber stock solution by ionic liquid method - Google Patents
Defoaming method of cellulose fiber stock solution by ionic liquid method Download PDFInfo
- Publication number
- CN116510356A CN116510356A CN202310430714.5A CN202310430714A CN116510356A CN 116510356 A CN116510356 A CN 116510356A CN 202310430714 A CN202310430714 A CN 202310430714A CN 116510356 A CN116510356 A CN 116510356A
- Authority
- CN
- China
- Prior art keywords
- stock solution
- container
- defoaming
- cellulose
- ionic liquid
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000011550 stock solution Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 42
- 229920003043 Cellulose fiber Polymers 0.000 title claims abstract description 17
- 239000002608 ionic liquid Substances 0.000 title claims abstract description 17
- 229920002678 cellulose Polymers 0.000 claims abstract description 48
- 239000001913 cellulose Substances 0.000 claims abstract description 48
- 239000002184 metal Substances 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000003292 glue Substances 0.000 claims abstract description 9
- 239000000243 solution Substances 0.000 claims abstract description 7
- 230000005484 gravity Effects 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 description 12
- 238000009987 spinning Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000004627 regenerated cellulose Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 229920000433 Lyocell Polymers 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920000875 Dissolving pulp Polymers 0.000 description 1
- 241000219146 Gossypium Species 0.000 description 1
- LFTLOKWAGJYHHR-UHFFFAOYSA-N N-methylmorpholine N-oxide Chemical compound CN1(=O)CCOCC1 LFTLOKWAGJYHHR-UHFFFAOYSA-N 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 229920006221 acetate fiber Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- XDAHMMVFVQFOIY-UHFFFAOYSA-N methanedithione;sulfane Chemical compound S.S=C=S XDAHMMVFVQFOIY-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/30—Loose or shaped packing elements, e.g. Raschig rings or Berl saddles, for pouring into the apparatus for mass or heat transfer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Organic Chemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
A defoaming method of cellulose fiber stock solution by an ionic liquid method is characterized in that: the method comprises the following steps: a. conveying the dissolved cellulose stock solution containing bubbles to a defoaming container through a heat-preserving conveying pipeline; b. the deaeration container is connected with the vacuumizing system, and the working pressure is always kept below-0.099 MPa; c. the cellulose stock solution is spread to be thin after passing through a plurality of double saddle metal structural members with the function of increasing the defoaming area in a defoaming container, so as to form a glue solution film, and the removal of bubbles in the cellulose stock solution is facilitated; d. the cellulose stock solution falls to the bottom of the container in a trickle mode by the gravity of the cellulose stock solution through the double saddle metal structural member, and is further defoamed in the falling process; e. the bottom of the defoaming container is always provided with a cellulose stock solution with a certain liquid level, so that the vacuum degree in the container is kept; f. the temperature-adjusting jacket is arranged outside the defoaming container, so that the temperature can be adjusted according to the process requirements.
Description
Technical Field
The invention relates to the field of production of regenerated cellulose fibers in chemical fibers, in particular to a defoaming method of cellulose fiber stock solution by an ionic liquid method.
Background
Regenerated cellulose fiber is one of the main types of chemical fiber, mainly comprises viscose fiber, acetate fiber, lyocell fiber and the like, adopts natural cellulose as a raw material, dissolves the natural cellulose by a chemical or physical method to prepare spinning stock solution, and generates cellulose fiber by a spinning machine. Compared with the traditional synthetic fiber taking petroleum as the raw material, the regenerated cellulose fiber has the characteristics of good affinity with human skin and the like, is the fiber with the closest performance to cotton in all chemical fibers, is prepared from natural cellulose including wood, bamboo, hemp, cotton linters and the like, can be naturally degraded after being abandoned, and is an environment-friendly chemical fiber.
The ionic liquid process of preparing regenerated cellulose fiber is one new kind of fiber producing technology in twenty-first century, and through regulating the kind and structure of anions and cations, ionic liquid with high cellulose dissolving capacity may be obtained, and the spinning solution may be prepared through direct dissolving cellulose process and wet or dry spray spinning to obtain fiber. Compared with viscose fiber, the ionic liquid fiber adopts a physical dissolution method, and no waste water containing acid and alkali and waste gas containing hydrogen sulfide and carbon disulfide are generated in the production process. Compared with NMMO solvent used by lyocell, the ionic liquid used by the ionic liquid method has the advantages of designability of ionic liquid, and the like, and can be designed and synthesized into the ionic liquid solvent which has better dissolving capacity to cellulose without degradation characteristic and is environment-friendly according to different sources of cellulose raw materials, and has good stability to temperature and metal ions, thereby providing a new approach for developing new generation cellulose green manufacturing technology.
Air bubbles are inevitably mixed in the manufacturing and conveying processes of the cellulose spinning solution, if the air bubbles are not removed, fiber breakage is generated during spinning, and the fiber quality is seriously affected, so that the defoaming process is one of the essential processes for preparing the cellulose spinning solution.
Disclosure of Invention
The invention aims to provide a defoaming method of cellulose fiber stock solution by an ionic liquid method, aiming at the defects in the prior art.
The aim of the invention can be achieved by the following technical measures:
the defoaming method of the cellulose fiber stock solution by the ionic liquid method comprises the following steps:
a. conveying the dissolved cellulose stock solution containing bubbles to a defoaming container through a heat-preserving conveying pipeline;
b. the deaeration container is connected with the vacuumizing system, and the working pressure is always kept below-0.099 MPa;
c. the cellulose stock solution is spread to be thin after passing through a plurality of double saddle metal structural members with the function of increasing the defoaming area in a defoaming container, so as to form a glue solution film, and the removal of bubbles in the cellulose stock solution is facilitated;
d. the cellulose stock solution falls to the bottom of the container in a trickle mode by the gravity of the cellulose stock solution through the double saddle metal structural member, and is further defoamed in the falling process;
e. the bottom of the defoaming container is always provided with a cellulose stock solution with a certain liquid level, so that the vacuum degree in the container is kept;
f. the temperature-adjusting jacket is arranged outside the defoaming container, so that the temperature can be adjusted according to the process requirements.
According to the invention, the liquid level of the cellulose stock solution positioned at the bottom of the defoaming container is always not less than one sixth of the height of the container, and a glue pool with a certain liquid level is formed at the bottom of the defoaming container.
The defoaming container is subjected to temperature adjustment through the shell with the jacket structure, so that the temperature of materials is kept at 70-90 ℃. The double saddle metal structural member is contained in a hanging basket arranged below a feeding hole of the defoaming container, and the containing quantity is 1000-100000.
Further, when the defoaming device works, working pressure below-0.099 MPa is kept in the container, cellulose stock solution enters from the feed inlet, firstly contacts the double saddle metal structural members placed in the basket, the cellulose stock solution is uniformly distributed and thinned on the double saddle metal structural members by gravity, the number of the double saddle metal structural members placed in the basket is configured according to different yields of the cellulose stock solution, the cellulose stock solution is approximately between 1000 and 100000, after flowing through the double saddle metal structural members, the cellulose stock solution is reserved in a trickle shape through a woven mesh at the bottom of the basket, and a glue pool with a certain liquid level is formed at the bottom of the defoaming container, so that the vacuum degree in the defoaming container is maintained.
The invention has the following beneficial effects:
the defoaming device disclosed by the invention has the advantages of simple structure, low manufacturing cost, high reliability and good popularization value.
The deaeration area of stock solution has been increased to two saddle structures of adoption, has improved deaeration efficiency.
The deaeration is carried out in the falling process of the fine flow, so that the fine bubbles can be removed easily.
The continuous defoaming of the cellulose stock solution is realized, and the industrial production problem of the defoaming of the cellulose fiber stock solution by the ionic liquid method is solved.
Drawings
Fig. 1 is a schematic view (perspective view) of a double saddle metal structure.
Fig. 2 is a side view (perspective view) of fig. 1.
Fig. 3 is a schematic structural diagram of the deaeration apparatus.
Number in the figure: 1 is a cylinder body, 2 is a jacket structure, 3 is a feed inlet, 4 is a discharge outlet, 5 is a vacuumizing port, 6 is a hanging basket, and 7 is a double saddle structural member.
Detailed Description
The invention will be further described with reference to the following examples (drawings):
the defoaming method of the cellulose fiber stock solution by the ionic liquid method comprises the following steps:
a. conveying the dissolved cellulose stock solution containing bubbles to a defoaming container through a heat-preserving conveying pipeline;
b. the deaeration container is connected with the vacuumizing system, and the working pressure is always kept below-0.099 MPa;
c. the cellulose stock solution is spread to be thin after passing through a plurality of double saddle metal structural members with the function of increasing the defoaming area in a defoaming container, so as to form a glue solution film, and the removal of bubbles in the cellulose stock solution is facilitated;
d. the cellulose stock solution falls to the bottom of the container in a trickle mode by the gravity of the cellulose stock solution through the double saddle metal structural member, and is further defoamed in the falling process;
e. the bottom of the defoaming container is always provided with a cellulose stock solution with a certain liquid level, so that the vacuum degree in the container is kept;
f. the temperature-adjusting jacket is arranged outside the defoaming container, so that the temperature can be adjusted according to the process requirements.
According to the invention, the liquid level of the cellulose stock solution positioned at the bottom of the defoaming container is always not less than one sixth of the height of the container, and a glue pool with a certain liquid level is formed at the bottom of the defoaming container.
The defoaming container is subjected to temperature adjustment through the shell with the jacket structure, so that the temperature of materials is kept at 80-90 ℃. The double saddle metal structural member is contained in a hanging basket arranged below a feeding hole of the defoaming container, and the containing quantity is 1000-100000.
As shown in fig. 1, 2 and 3, the defoaming device of the invention comprises a cylinder body 1 with a jacket structure 2, a feed inlet 3 arranged at the top of the cylinder body, a discharge outlet 4 arranged at the bottom of the cylinder body, a side vacuumizing port 5 positioned at the side of the feed inlet, a basket 6 positioned right below the feed inlet, and a plurality of double saddle structural members 7 filled in the basket.
When the defoaming device works, working pressure below-0.099 MPa is kept in the container, cellulose stock solution enters from the feed inlet and is firstly contacted with a double saddle metal structural member placed in the basket, the cellulose stock solution is uniformly distributed and thinned on the double saddle metal structural member by gravity, the quantity of the double saddle metal structural members is approximately between 1000 and 100000 pieces according to different yields, after the cellulose stock solution flows through the double saddle metal structural member, the cellulose stock solution is left in a trickle shape through a woven mesh at the bottom of the basket, and a glue pool with a certain liquid level is formed at the bottom of the defoaming cylinder so as to be beneficial to keeping the vacuum degree in the defoaming cylinder. When the barrel jacket works, temperature-adjusting water is introduced, and corresponding temperature is adjusted according to process requirements. The continuous defoaming of the cellulose stock solution can be realized by the equipment, so that the difficult problem of industrial production of the defoaming of the cellulose stock solution by an ionic liquid method is solved.
Claims (4)
1. A defoaming method of cellulose fiber stock solution by an ionic liquid method is characterized in that: the method comprises the following steps:
a. conveying the dissolved cellulose stock solution containing bubbles to a defoaming container through a heat-preserving conveying pipeline;
b. the deaeration container is connected with the vacuumizing system, and the working pressure is always kept below-0.099 MPa;
c. the cellulose stock solution is spread to be thin after passing through a plurality of double saddle metal structural members with the function of increasing the defoaming area in a defoaming container, so as to form a glue solution film, and the removal of bubbles in the cellulose stock solution is facilitated;
d. the cellulose stock solution falls to the bottom of the container in a trickle mode by the gravity of the cellulose stock solution through the double saddle metal structural member, and is further defoamed in the falling process;
e. the bottom of the defoaming container is always provided with a cellulose stock solution with a certain liquid level, so that the vacuum degree in the container is kept;
f. the temperature-adjusting jacket is arranged outside the defoaming container, so that the temperature can be adjusted according to the process requirements.
2. The method for deaerating an ionic liquid-process cellulose fiber stock solution according to claim 1, wherein: the defoaming container is subjected to temperature adjustment through a shell with a jacket structure, so that the temperature of materials is kept at 70-90 ℃.
3. The method for deaerating an ionic liquid-process cellulose fiber stock solution according to claim 1, wherein: the double saddle metal structural parts are contained in a hanging basket arranged below a feed inlet of the defoaming container, and the containing quantity is 1000-100000.
4. The method for deaerating an ionic liquid-process cellulose fiber stock solution according to claim 1, wherein: the liquid level of the cellulose stock solution at the bottom of the defoaming container is always not less than one sixth of the container, and a glue pool with a certain liquid level is formed at the bottom of the defoaming container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310430714.5A CN116510356A (en) | 2023-04-21 | 2023-04-21 | Defoaming method of cellulose fiber stock solution by ionic liquid method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310430714.5A CN116510356A (en) | 2023-04-21 | 2023-04-21 | Defoaming method of cellulose fiber stock solution by ionic liquid method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116510356A true CN116510356A (en) | 2023-08-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310430714.5A Pending CN116510356A (en) | 2023-04-21 | 2023-04-21 | Defoaming method of cellulose fiber stock solution by ionic liquid method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116510356A (en) |
-
2023
- 2023-04-21 CN CN202310430714.5A patent/CN116510356A/en active Pending
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