CN1793097A - Process for preparing polymeric formal - Google Patents
Process for preparing polymeric formal Download PDFInfo
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- CN1793097A CN1793097A CN 200510048231 CN200510048231A CN1793097A CN 1793097 A CN1793097 A CN 1793097A CN 200510048231 CN200510048231 CN 200510048231 CN 200510048231 A CN200510048231 A CN 200510048231A CN 1793097 A CN1793097 A CN 1793097A
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- paraformaldehyde
- reaction vessel
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- dissolving
- drying
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Abstract
The invention discloses a method to make paraformaldehyde. The feature is that it uses industrial formaldehyde that has concentration of 37%, puts the solution into reactor, adds 1-4% catalyst NaOH and dissolving, freezes to 5-20 degree centigrade below zero for 1-8 hours to form paraformaldehyde, after filtering, cleaning, and drying, the product would be gained. The invention is low invest, short technology process, and easy to operate. It could improve the occupancy of paraformaldehyde made in China in market.
Description
Technical field
The present invention relates to the preparation method of Paraformaldehyde 96.
Background technology
What produce the external employing of Paraformaldehyde 96 at present is the vacuum distillation equipment of the higher continuous concentration of a cover mechanization degree, and industrial scale is bigger, constant product quality, and the share of market height, but this technological equipment investment is big, the cost height; As Saudi Arabia SFCC company is to adopt the patented technology of India KonkanChemicalsPrivateLid. to produce.Technological process is as follows: the formaldehyde solution with 45% is through an agitating film evaporator, under the 53-61kPa vacuum, after 85-95 ℃ is concentrated into 75%, send into and carry out polymerization, drying in the rotary vacuum dryer, catalyst for polymerization is a sodium hydroxide solution, temperature is 85-105 ℃, obtains solid phase prod, obtains the Paraformaldehyde 96 product through operations such as precomminution, screening, pin mills again, the light formaldehyde that process produces concentrates by wiped film evaporator, recycles.China then adopts the vacuum-evaporation of traditional batch formula to concentrate complicated technologies such as reaching mist projection granulating, as: China Jilin Shi Jinggou amalgamation factory once developed technology such as two-stage concentrates, mist projection granulating, two-stage drying and produced Paraformaldehyde 96; 1000 of Tianjin Organic Chemical Plant exploitation rams the loose soil with a stone-roller after sowing/year the Paraformaldehyde 96 production technique be 37% formalin through depolymerization, vacuum concentration, add catalyzer, obtain 96% Paraformaldehyde 96 product through mist projection granulating, oven dry.Recyclable utilization of rare formaldehyde or the discharging of processing back.Not only energy consumption is big for these technologies that China adopted, cost height, and poor product quality, and scale does not increase, and lacks the world and strives power unexpectedly, causes China that the demand of Paraformaldehyde 96 is not broken away from import for a long time.
Summary of the invention
Purpose of the present invention is intended to overcome above-mentioned shortcoming, and the Paraformaldehyde 96 that a kind of technical process is short, simple to operate, cost is low preparation method is provided.
For achieving the above object, the present invention adopts following solution: utilize the characteristic of formaldehyde, by control reaction temperature and add the synthetic Paraformaldehyde 96 of certain catalyzer, concrete technical process is as follows:
With concentration is that 37% the industrial formol aqueous solution is raw material, this aqueous solution is put into reaction vessel, the catalyzer sodium hydroxide that adds 1%-4% then in reaction vessel makes its dissolving, freeze again to-5 ℃--20 ℃, it is reacted down at-5 ℃--20 ℃ formed Paraformaldehyde 96 in 1-8 hour, can become finished product through filtration, washing, drying at last.
Compared with prior art, the present invention has following advantage:
1, owing to the present invention puts into general reaction vessel (as reactor or reaction cylinder etc.) with the industrial formol aqueous solution to add catalyzer formation Paraformaldehyde 96 at low temperatures, can become finished product through filtration, washing, drying again, so the present invention has equipment less investment, short, the simple to operate advantage of technical process., improve output, reduce cost very feasiblely expanding the scale of production with this process exploitation Paraformaldehyde 96, will play positive pushing effect the occupation rate of comprehensive lifting China's Paraformaldehyde 96 on market.
2, to produce the transformation efficiency of Paraformaldehyde 96 be about 80% in the present invention, and the formaldehyde that loses in the reaction process can absorb by the aqueous solution again and utilize.
Embodiment
Embodiment one: with 100 gram concentration is that 37% formalin is put into reaction vessel, add 1 gram sodium hydroxide and make its dissolving, be put in the refrigerator then and freeze, when temperature drops to-14 ℃, they are reacted under this temperature can form Paraformaldehyde 96 in 4 hours.Finally can get the Paraformaldehyde 96 percentage is 70%.
Embodiment two: with 100 gram concentration is that 37% formalin is put into reaction vessel, add 2 gram sodium hydroxide and make its dissolving, be put in the refrigerator then and freeze, when temperature drops to-8 ℃, they are reacted under this temperature can form Paraformaldehyde 96 in 3 hours, finally can get the Paraformaldehyde 96 percentage is 75%.
Embodiment three: with 100 gram concentration is that 37% formalin is put into reaction vessel, add 3 gram sodium hydroxide and make its dissolving, be put into then when freezing in the refrigerator to-20 ℃, they are reacted under this temperature can form Paraformaldehyde 96 in 2 hours, finally can obtain the Paraformaldehyde 96 percentage is 76%;
Embodiment four: with 100 gram concentration is that 37% formalin is put into reaction vessel, add 4 gram sodium hydroxide and make its dissolving, be put into then when freezing in the refrigerator to-18 ℃, they are reacted under this temperature can form Paraformaldehyde 96 in 1 hour, finally can obtain the Paraformaldehyde 96 percentage is 78%.
Claims (1)
1, a kind of preparation method of Paraformaldehyde 96, it is characterized in that: with concentration is that 37% the industrial formol aqueous solution is raw material, this aqueous solution is put into reaction vessel, the catalyzer sodium hydroxide that adds 1%-4% then in reaction vessel makes its dissolving, freeze again to-5 ℃----20 ℃, make it at-5 ℃----20 ℃ are reacted 1-8 hour formation Paraformaldehyde 96 down, can become finished product through filtration, washing, drying at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510048231 CN1793097A (en) | 2005-12-21 | 2005-12-21 | Process for preparing polymeric formal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510048231 CN1793097A (en) | 2005-12-21 | 2005-12-21 | Process for preparing polymeric formal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1793097A true CN1793097A (en) | 2006-06-28 |
Family
ID=36804761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510048231 Pending CN1793097A (en) | 2005-12-21 | 2005-12-21 | Process for preparing polymeric formal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1793097A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109970532A (en) * | 2019-04-25 | 2019-07-05 | 镇江李长荣高性能材料有限公司 | A kind of paraformaldehyde additives used for producing |
-
2005
- 2005-12-21 CN CN 200510048231 patent/CN1793097A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109970532A (en) * | 2019-04-25 | 2019-07-05 | 镇江李长荣高性能材料有限公司 | A kind of paraformaldehyde additives used for producing |
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