CN103382243A - Method used for cleaning glue residues in melamine urea-formaldehyde glue reaction vessel - Google Patents
Method used for cleaning glue residues in melamine urea-formaldehyde glue reaction vessel Download PDFInfo
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- CN103382243A CN103382243A CN2013102771377A CN201310277137A CN103382243A CN 103382243 A CN103382243 A CN 103382243A CN 2013102771377 A CN2013102771377 A CN 2013102771377A CN 201310277137 A CN201310277137 A CN 201310277137A CN 103382243 A CN103382243 A CN 103382243A
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- Prior art keywords
- glue
- reactor
- formaldehyde
- cleaning
- trimeric cyanamide
- Prior art date
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- 239000003292 glue Substances 0.000 title claims abstract description 95
- 238000004140 cleaning Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 title abstract description 15
- HANVTCGOAROXMV-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine;urea Chemical compound O=C.NC(N)=O.NC1=NC(N)=NC(N)=N1 HANVTCGOAROXMV-UHFFFAOYSA-N 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000009835 boiling Methods 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 16
- 239000002893 slag Substances 0.000 claims description 48
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 33
- NPJDPKXNWFMWHO-UHFFFAOYSA-N C=O.NC(N)=O.NC#N Chemical compound C=O.NC(N)=O.NC#N NPJDPKXNWFMWHO-UHFFFAOYSA-N 0.000 claims description 21
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 4
- 230000032683 aging Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 5
- 230000018044 dehydration Effects 0.000 abstract description 3
- 238000006297 dehydration reaction Methods 0.000 abstract description 3
- 238000005406 washing Methods 0.000 abstract 2
- 238000001816 cooling Methods 0.000 description 5
- 238000010411 cooking Methods 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 description 3
- 206010013786 Dry skin Diseases 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 206010024769 Local reaction Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses a method used for cleaning melamine urea-formaldehyde glue residues from a reaction vessel in glue-making workshops. The method comprises steps of washing, steam boiling, drying, glue residue aging, and washing. According to the method, the glue residues are boiled before high temperature dehydration and aging; and then the glue residues are easy to peel off from the inner wall of the reaction vessel after steam heating and drying. A series of complex physical-chemical reactions occur when an appropriate amount of water is added into the glue residues and remained raw materials, and the glue residues and remained raw materials are heated by stream to 90 to 95 DEG C; so that the glue residues are easy to age and embrittle, and are easy to peel off; and cleaning effects are better.
Description
Technical field
The present invention relates to wood working tackiness agent chemical field, particularly the method for cleaning of glue department internal reaction still trimeric cyanamide urea-formaldehyde glue glue slag.
Background technology
The trimeric cyanamide urea-formaldehyde glue is high, water-fast, the heat-resisting sizing agent of a kind of bonding strength, and the trimeric cyanamide urea-formaldehyde glue adds trimeric cyanamide to improve the water tolerance of urea-formaldehyde glue take urea and formaldehyde as main raw material therein, and the chemical formula of trimeric cyanamide is as follows:
The trimeric cyanamide urea-formaldehyde glue belongs to thermosetting resin, in the wood processing field widespread use, all can use urea-formaldehyde glue to carry out as artificial board etc. bonding, the trimeric cyanamide urea-formaldehyde glue after production is completed, can be in reactor lingering section glue slag.The generation of reactor glue slag is the byproduct of trimeric cyanamide urea formaldehyde glue, adheres to still wall and coil pipe in case produce, extremely difficult cleaning; And easily cause reactor glue local reaction incomplete, and produce more glue slag, cause the further decline of reactor production efficiency, cooling can be very slow, affects the glue quality.
Summary of the invention
The glue slag that the present invention is directed to the prior art existence reduces the production efficiency of reactor, affects the stable technical problem of glue quality, and a kind of method for cleaning of quick cleaning trimeric cyanamide urea-formaldehyde glue reactor glue slag is provided.
The present invention is in order to solve the problems of the technologies described above, by the following technical solutions:
The method for cleaning of trimeric cyanamide urea-formaldehyde glue reactor glue slag comprises the following steps:
1: in the reactor that will need to clear up, glue is emptying, closes formaldehyde feed valve and glue bleeder valve, and water rinses the glue slag in reactor to reactor;
2: add water in reactor, water is discharged in boiling;
3: to the reactor drying that heats up;
4: clear up dried glue slag.
In above-mentioned step 1, purpose is to avoid the scattered glue slag that comes off to stop up the reactor bottom valve, in order not allow the glue slag in flushing waste water be discharged arbitrarily, preferably will install a strainer additional under Polycondensation Reactor and Esterification Reactor, makes to rinse and filters by strainer.
In above-mentioned step 2, purpose is by boiling, make between the residual raw material of glue slag, water and reaction physical-chemical reaction occurs, softening glue slag, abundant saturated suction between glue solid impurity particle molecule, make its dewater when drying more thorough rapidly, and a small amount of glue slag is dissolved in water because of boiling, discharges outside reactor with water.For glue slag small-particle is fully absorbed water, preferably adopt steam-heated mode.
In above-mentioned step 2, be eliminated better in order to make formaldehyde, preferably add sodium hydroxide before boiling in water, make the ph value reach 8-10, both neutralization reaction in reactor, complete with poisonous formaldehyde reaction fast.In order to make the glue slag fully softening, be preferably in boiling under the condition of 90-95 ℃, cooking time is controlled at 5-7 hour; Preferably cooking time is 6 hours.
In above-mentioned step 3, purpose is to make the moisture of the glue slag after softening sufficient, and the cohesive force between molecule reduces, and drying is easy to slough that moisture content is aging becomes fragile, and the glue slag that becomes fragile and the adhesive power between reactor reduce, more easy to clean.Carry out drying when preferably temperature of reaction kettle being risen to 100-120 ℃, carry out again dry glue slag after the boiling of test of many times proof, can make aging the becoming fragile of glue slag dehydration at lower temperature 100-120 ℃, and convection drying needs the temperature of 150 ℃ at least, the glue slag is dewatered aging under hot conditions.Preferably be controlled at 20-50 hour time of drying, and most preferably 24-48 hour, because dewatering speed after boiling accelerates, so also one times of relative shortening time of drying.In addition, in heating, preferably the condenser flexible pipe on reactor is removed.
In above-mentioned step 4, can adopt the instrument of irony that the glue slag on reactor inwall and spiral coil cooling tube is cleaned out.Enter reactor, with the irony instrument, the glue slag of reactor inside is cleaned out.
The present invention carries out boiling before aging the glue slag being carried out high temperature dehydration, and after adopting steam-heated mode to process, the glue slag is very easy to peel off from the reactor inwall come off in oven dry afterwards, compares with direct oven dry is aging, and unexpected effect has occured.The trimeric cyanamide urea-formaldehyde glue is made by trimeric cyanamide, urea and formaldehyde reaction, glue slag after reaction is completed and residual raw material are after adding appropriate water, when the condition of 90-95 ℃ is carried out steam heating, the physical-chemical reaction of series of complex has occured, make easier aging the becoming fragile of glue slag, thereby it is more easily peeled off, and cleaning effect is better.
Embodiment
Be described in further detail below in conjunction with specifically having implemented the present invention is done;
Embodiment 1
The method for cleaning of trimeric cyanamide urea-formaldehyde glue reactor glue slag comprises the following steps:
Clean: in the reactor that will need to clear up, glue is emptying, successively closes formaldehyde feed valve and glue bleeder valve, opens the reactor strainer, utilizes the flushing with clean water reactor, and scattered glue slag is gone out in the outer strainer of reactor.
Boiling: water is put into reactor, be limited to flood coil pipe, hydro-oxidation sodium stirs to ph value 8, and is then 90 ℃ of boilings 5 hours, that the reaction of the formaldehyde gas in reactor is complete, opens reactor cooling water valve, is cooled to normal temperature, and water is discharged outside reactor; Steam-heated mode is adopted in described boiling.
Oven dry: the reactor water valve of lowering the temperature cuts out, and the condenser flexible pipe is removed, and is warming up to 100 ℃ of dryings 20 hours, until reactor steam is discharged fully, then is cooled to normal temperature.
Cleaning: enter reactor, with the irony instrument, the glue slag on reactor inwall and spiral coil cooling tube is cleaned out.
Embodiment 2
The method for cleaning of trimeric cyanamide urea-formaldehyde glue reactor glue slag comprises the following steps:
Clean: in the reactor that will need to clear up, glue is emptying, successively closes formaldehyde feed valve and glue bleeder valve, opens the reactor strainer, utilizes the flushing with clean water reactor, and scattered glue slag is gone out in the outer strainer of reactor.
Boiling: water is put into reactor, to flood the coil pipe (20m that is limited
3Reactor adds 13 tons, water), hydro-oxidation sodium stirs to ph value 10, and is then 95 ℃ of boilings 7 hours, that the reaction of the formaldehyde gas in reactor is complete, opens reactor cooling water valve, is cooled to normal temperature, and water is discharged outside reactor; Steam-heated mode is adopted in described boiling.
Oven dry: the reactor water valve of lowering the temperature cuts out, and the condenser flexible pipe is removed, and is warming up to 120 ℃ of dryings 50 hours, until reactor steam is discharged fully, then is cooled to normal temperature.
Cleaning: enter reactor, with the irony instrument, the glue slag on reactor inwall and spiral coil cooling tube is cleaned out.
Embodiment 3
The method for cleaning of trimeric cyanamide urea-formaldehyde glue reactor glue slag comprises the following steps:
Clean: in the reactor that will need to clear up, glue is emptying, successively closes formaldehyde feed valve and glue bleeder valve, opens the reactor strainer, utilizes the flushing with clean water reactor, and scattered glue slag is gone out in the outer strainer of reactor.
Boiling: water is put into reactor, to flood the coil pipe (20m that is limited
3Reactor adds 13 tons, water), hydro-oxidation sodium stirs to ph value 9, and is then 93 ℃ of boilings 6 hours, that the reaction of the formaldehyde gas in reactor is complete, opens reactor cooling water valve, is cooled to normal temperature, and water is discharged outside reactor; Steam-heated mode is adopted in described boiling.
Oven dry: the reactor water valve of lowering the temperature cuts out, and the condenser flexible pipe is removed, and is warming up to 110 ℃ of dryings 30 hours, until reactor steam is discharged fully, then is cooled to normal temperature.
Cleaning: enter reactor, with the irony instrument, the glue slag on reactor inwall and spiral coil cooling tube is cleaned out.
Cleaning effect compares:
According to the method for embodiment 3 cleaning trimeric cyanamide urea-formaldehyde glue reactor glue slag, the first adopts the steam heating post-drying, cooking time respectively less than 5h, 5-7h, greater than 7h, the second adopts the mode of direct oven dry that do not heat, then clear up, cleaning effect is compared, relatively see Table 1.
Table 1
Conclusion: above-mentioned test shows, adopts the steam heating post-drying, and then the effect of clearing up is not than heating the better effects if that direct oven dry is cleared up, and cooking time is the most suitable at 5-7h.
Claims (7)
1. the method for cleaning of trimeric cyanamide urea-formaldehyde glue reactor glue slag is characterized in that comprising the following steps:
1): in the reactor that will need to clear up, glue is emptying, closes formaldehyde feed valve and glue bleeder valve, and water rinses the glue slag in reactor to reactor;
2): add water in reactor, water is discharged in boiling;
3): to the reactor drying that heats up;
4): clear up dried glue slag.
2. the method for cleaning of trimeric cyanamide urea-formaldehyde glue reactor glue slag according to claim 1 is characterized in that: described step 1), the reactor bottom is provided with strainer, and described glue slag pours in strainer.
3. the method for cleaning of trimeric cyanamide urea-formaldehyde glue reactor glue slag according to claim 1 is characterized in that: described step 2), steam-heated mode is adopted in boiling.
4. the method for cleaning of trimeric cyanamide urea-formaldehyde glue reactor glue slag according to claim 1, is characterized in that: described step 2), add NaOH before boiling in water, regulate ph to 8-10.
5. the method for cleaning of trimeric cyanamide urea-formaldehyde glue reactor glue slag according to claim 1, is characterized in that: described step 2), at 90-95 ℃ of boiling 5-7 hour.
6. the method for cleaning of trimeric cyanamide urea-formaldehyde glue reactor glue slag according to claim 1, is characterized in that: in described step 3), reactor is warming up to 100-120 ℃.
7. the method for cleaning of trimeric cyanamide urea-formaldehyde glue reactor glue slag according to claim 1 is characterized in that: in described step 3), and 20-50 hour time of drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102771377A CN103382243A (en) | 2013-07-03 | 2013-07-03 | Method used for cleaning glue residues in melamine urea-formaldehyde glue reaction vessel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102771377A CN103382243A (en) | 2013-07-03 | 2013-07-03 | Method used for cleaning glue residues in melamine urea-formaldehyde glue reaction vessel |
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| Publication Number | Publication Date |
|---|---|
| CN103382243A true CN103382243A (en) | 2013-11-06 |
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| CN2013102771377A Pending CN103382243A (en) | 2013-07-03 | 2013-07-03 | Method used for cleaning glue residues in melamine urea-formaldehyde glue reaction vessel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109290296A (en) * | 2018-09-19 | 2019-02-01 | 绵阳飞远科技有限公司 | A kind of clean method of reaction kettle colloid reaction residue |
-
2013
- 2013-07-03 CN CN2013102771377A patent/CN103382243A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 李德福等: "《石油化工设备清洗技术》", 31 October 2003 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109290296A (en) * | 2018-09-19 | 2019-02-01 | 绵阳飞远科技有限公司 | A kind of clean method of reaction kettle colloid reaction residue |
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Application publication date: 20131106 |