CN1029351C - Making method for polymer formol with high content of formol - Google Patents
Making method for polymer formol with high content of formol Download PDFInfo
- Publication number
- CN1029351C CN1029351C CN 89107085 CN89107085A CN1029351C CN 1029351 C CN1029351 C CN 1029351C CN 89107085 CN89107085 CN 89107085 CN 89107085 A CN89107085 A CN 89107085A CN 1029351 C CN1029351 C CN 1029351C
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- China
- Prior art keywords
- paraformaldehyde
- suspension
- formol
- formaldehyde
- formaldehyde content
- Prior art date
- 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.)
- Expired - Fee Related
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The present invention relates to a method for preparing paraformaldehyde with high formaldehyde content, which comprises the steps that a concentrated formaldehyde aqueous solution or a suspension of which the formaldehyde content is from 75 to 85% is cooled and solidified to prepare the paraformaldehyde; a small quantity of alkaline earth metal compounds which are powdered and insoluble or are dispersed in lower alcohol to be prepared into a suspension are added to the concentrated paraformaldehyde aqueous solution or the suspension before a cooling and solidifying process or in the cooling and solidifying process for drying, and paraformaldehyde solid particles of which the formaldehyde content are 85% are prepared.
Description
The present invention relates to a kind of manufacture method of the improved Paraformaldehyde 96 of producing high formaldehyde content with the concentrated aqueous solutions or the suspension of Paraformaldehyde 96.
The Paraformaldehyde 96 of high formaldehyde content is meant that formaldehyde content is more than 85% among the present invention.
In the prior art, the formaldehyde content of Paraformaldehyde 96 is about 80%.But the Paraformaldehyde 96 demand of high formaldehyde content constantly increases in recent years, because as the raw material of phenolic resin, begins the requirement formaldehyde content and be about 90% Paraformaldehyde 96.
The manufacture method of the Paraformaldehyde 96 of existing high formaldehyde content is to be formaldehyde content that the formalin of 37-50% becomes concentrated aqueous solutions or suspension about 80% through vacuum concentration, uses extrusion machine to make a certain size particle after the cooling.But, so the time its flowability bad, on the machine wall that can be attached to extrusion machine, make operation very difficult.
Paraformaldehyde 96 through behind the cooling curing after placing for some time below 40 ℃ fusing point rise to more than 65 ℃, and flowability improves, but must then need place more than 24 hours as will further improving liquidity storage period more than 3 hours.
The objective of the invention is to invent a kind of improved, can overcome the manufacture method of Paraformaldehyde 96 of the high formaldehyde content of above-mentioned difficulties.
The manufacture method of the Paraformaldehyde 96 of the high formaldehyde content of the present invention is in the manufacturing processed of Paraformaldehyde 96, adds a spot of basic alkaline earth metal compound, can address the above problem, thereby finish the present invention.Specifically, method of the present invention is formaldehyde concentrated aqueous solutions or the suspension cooling curing drying of formaldehyde content at 75-85%, makes the product more than 85%.In formalin or suspension, add a small amount of suspension liquid before cooling curing or in the cooling curing process, the method for making of this suspension liquid is that the fine powder that is insoluble in the basic alkaline earth metal compound of water is distributed in the lower alcohol, the Paraformaldehyde 96 that will add behind a small amount of suspension liquid joins in the extrusion machine, make the particle about 2-5mm, joined in the Vacuumdrier dry 1-2 hour, and to specified water-content, took out.
The waste gas of this moment is all absorbed by water, and the aqueous solution that can be used as formaldehyde re-uses.
Dried Paraformaldehyde 96 is made the finished product of 0.2-0.8mm with accurate crusher (special roll-type granulator) granulating.
Embodiment
The aqueous solution that contains formaldehyde 37% is obtained containing the Paraformaldehyde 96 concentrated aqueous solutions of formaldehyde 80% at 65 ℃ of following vacuum concentration, concentration with 1.5% adds suspension liquid, the manufacture method that should hang fluid injection is that the magnesium oxide powder end is distributed in the methyl alcohol, obtaining magnesium oxide concentration is the methyl alcohol suspension liquid of 50ppm, join in the extrusion machine then, obtain the particle of 2-5mm, this particle is joined in the drying machine, can be made into the Paraformaldehyde 96 that contains solids component 80% in dry 60 minutes, can be made into 92% Paraformaldehyde 96 in dry 120 minutes, its output is 400kg/hr.
This product is joined in the accurate crusher (special roll-type granulator), make the particulate product of 0.2-0.8mm, its big I is regulated by the cylinder of changing the roll-type granulator, and output is 500kg/hr.
This shows, use the inventive method that the flowability of formaldehyde concentrated aqueous solutions or suspension is improved, add before the drying machine, can machine wall attached to extrusion machine on, obtain saccharoid easily; It is carried out the short period of time drying in Vacuumdrier, can reach the water-content of regulation, dried saccharoid is joined make product in the granulator.
Claims (1)
1, a kind of manufacture method of Paraformaldehyde 96 of high formaldehyde content, the concentrated aqueous solutions or the suspension cooling curing that wherein with formaldehyde (FA) content are 75-85% (weight) are produced Paraformaldehyde 96 (PFA), it is characterized in that: in the Paraformaldehyde 96 concentrated aqueous solutions or suspension before cooling curing or in the cooling curing process, add the water that is insoluble in make powdered, or being scattered in a spot of basic alkaline earth metal compound of making in the lower alcohol behind the suspension liquid carries out drying, makes formaldehyde content and reaches Paraformaldehyde 96 more than 85%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89107085 CN1029351C (en) | 1989-09-16 | 1989-09-16 | Making method for polymer formol with high content of formol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89107085 CN1029351C (en) | 1989-09-16 | 1989-09-16 | Making method for polymer formol with high content of formol |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1050201A CN1050201A (en) | 1991-03-27 |
| CN1029351C true CN1029351C (en) | 1995-07-19 |
Family
ID=4857037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89107085 Expired - Fee Related CN1029351C (en) | 1989-09-16 | 1989-09-16 | Making method for polymer formol with high content of formol |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1029351C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845130A (en) * | 2010-06-04 | 2010-09-29 | 烟台万华聚氨酯股份有限公司 | Method for preparing paraformaldehyde |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2087041B1 (en) | 1994-12-09 | 1997-03-16 | Patentes Novedades Sa | PROCEDURE FOR THE PREPARATION OF PARAFORMALDEHYDE. |
-
1989
- 1989-09-16 CN CN 89107085 patent/CN1029351C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845130A (en) * | 2010-06-04 | 2010-09-29 | 烟台万华聚氨酯股份有限公司 | Method for preparing paraformaldehyde |
| CN101845130B (en) * | 2010-06-04 | 2012-05-30 | 烟台万华聚氨酯股份有限公司 | Method for preparing paraformaldehyde |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1050201A (en) | 1991-03-27 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |