CN202576297U - Formaldehyde production process device with low methanol residue - Google Patents
Formaldehyde production process device with low methanol residue Download PDFInfo
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- CN202576297U CN202576297U CN 201220159749 CN201220159749U CN202576297U CN 202576297 U CN202576297 U CN 202576297U CN 201220159749 CN201220159749 CN 201220159749 CN 201220159749 U CN201220159749 U CN 201220159749U CN 202576297 U CN202576297 U CN 202576297U
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Abstract
The utility model discloses a formaldehyde production process device with low methanol residue, which comprises an evaporator, a superheater, a flame arrester, an oxidation reaction tower and an absorption tower, wherein the inlet of the evaporator is connected with a methanol raw material tank, the outlet of the evaporator is communicated with the superheater, the flame arrester and the top of the oxidation reaction tower in sequence, the bottom outlet of the oxidation reaction tower is communicated with the bottom inlet of the absorption tower, two outlets are arranged at the top of the absorption tower, wherein one outlet is connected with the steam inlet of the evaporator through a through pipeline and the other outlet is connected with the inlet of a methanol separator, the top outlet of the methanol separator is connected with a tail gas treatment tower, and a product outlet is arranged at the bottom of the methanol separator. According to the utility model, a content of the methanol in the original methanol product is reduced to be lower than 0.2% from 1%, consumption of steam is reduced, energy and cost are saved, and meanwhile, amino plastic wastewater and tail gas discharged by formaldehyde can be reduced, so that environmental pollution is reduced.
Description
Technical field
The utility model belongs to the Chemicals production technology, relates in particular to the Formaldehyde Production process unit.
Background technology
Formaldehyde is the Elementary Chemical Industry raw material, is widely used in productions such as resin, plastics, leather, paper and fiber, in people's productive life, plays an important role.China's formaldehyde industry is started in 1956, updates, improves and development through five more than ten years, has become first big country of world's Formaldehyde Production and consumption at present.At present the production overwhelming majority of formaldehyde all adopts silver-colored method, mainly through the evaporator gasification and under silver-colored katalysis oxydehydrogenation obtain the formaldehyde solution about 37～50% after the absorption tower water-cooled absorbs.The methyl alcohol that generally all contains about 1～2% in the formaldehyde solution that this technology obtains is residual, requires in the formaldehyde methanol content extremely low or do not contain methyl alcohol during some is used, and therefore this situation is just undesirable.And vaporizer need consume a large amount of steam heats in this technology, and produces byproduct gas such as tail gas air ambient is polluted.Simultaneously a lot of chemical plant also exist the production line of other Chemicals can cause environmental pollution equally, energy mass consumption.
Summary of the invention
Goal of the invention: to the problem and shortage of above-mentioned existing existence; The purpose of the utility model provides the residual Formaldehyde Production process unit of a kind of low methyl alcohol; Extremely low through methanol content in the formaldehyde solution of this device acquisition; And ability recycling aminoplastics waste water reduces the pollution to environment.
Technical scheme: for realizing the foregoing invention purpose; The utility model adopts following technical scheme: the Formaldehyde Production process unit that a kind of low methyl alcohol is residual; It comprises vaporizer, suphtr, spark arrester, oxidizing reaction tower and absorption tower, and said evaporator inlet is connected with the methanol feedstock jar, and its outlet is communicated with the top of suphtr, spark arrester and oxidizing reaction tower successively; The outlet at bottom of said oxidizing reaction tower is communicated with the absorption tower bottom inlet; The top, absorption tower is provided with two outlets, and one of them outlet is connected with the steam-in of vaporizer through threading a pipe, and the another one outlet then is connected with the inlet of methanol separator; Said methanol separator top exit then is connected with the vent gas treatment tower, and the methanol separator bottom is provided with products export.
Further improve, also be provided with the aminoplastics waterwater entrance in the said absorption tower, be provided with clean-up stage between said aminoplastics waterwater entrance and the spray section, this clean-up stage is filled with structured packing.
As preferably, be filled with structured packing in the said methanol separator.
Beneficial effect: compared with prior art; The utlity model has following advantage: the methanol content in the ortho-formaldehyde product is reduced to below 0.2% by 1%; And the consumption of reduction water vapour; Practiced thrift the energy and cost, reduced the exhaust emissions of aminoplastics waste water and Formaldehyde Production simultaneously, thereby reduced pollution environment.
Description of drawings
Fig. 1 is the said Formaldehyde Production process unit of a utility model synoptic diagram.
Wherein, vaporizer 1, suphtr 2, spark arrester 3, oxidizing reaction tower 4, absorption tower 5, vent gas treatment tower 6, clean-up stage 7, separator 8.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment; Further illustrate the utility model; Should understand these embodiment only be used to the utility model is described and be not used in the restriction the utility model scope; After having read the utility model, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the utility model.
As shown in Figure 1; The Formaldehyde Production process unit that a kind of low methyl alcohol is residual, it comprises vaporizer 1, suphtr 2, heat-resistor 3, oxidizing reaction tower 4 and absorption tower 5, said vaporizer 4 inlets are connected with head tank; Its outlet is communicated with the top of suphtr 2, spark arrester 3 and oxidizing reaction tower 4 successively; The outlet at bottom of said oxidizing reaction tower 4 is communicated with the absorption tower bottom inlet, and 5 tops, absorption tower are provided with two outlets, and one of them outlet is connected with the steam-in of vaporizer 1 through threading a pipe; The another one outlet then is connected with the inlet of methanol separator 8; Said methanol separator 8 top exits then are connected with vent gas treatment tower 6, and methanol separator 8 bottoms are provided with products export, and the bottom, absorption tower is provided with products export; And also be provided with the aminoplastics waterwater entrance in the said absorption tower, be provided with clean-up stage between said aminoplastics waterwater entrance and the spray section, this clean-up stage is filled with structured packing.
At first utilize pump that material benzenemethanol is pumped in the vaporizer 1 through gauger; The while bubbling air; Under the stirring of air, make methanol gasifying; Vaporizer 1 bottom is provided with heating coil in this process, feeds steam heating methyl alcohol in this coil pipe, thereby the while center also is provided with the heat exchange tubulation that supplies aminoplastics waste water to pass through methyl alcohol is heated; Methanol-air mixing tank after the gasification enters into suphtr 2, and adds water vapour and the tail gas that this technology produces, and makes methyl alcohol, air and water vapour, and tail gas mixes composition quaternary gas; Above-mentioned quaternary gas is behind spark arrester 3; Temperature is sent into oxidizing reaction tower 4 tops under about 110 ℃, carry out methyl alcohol silver method oxidative dehydrogenation, and this temperature of reaction is 650 ~ 660 ℃; Reacted product flows out from the bottom of oxidizing reaction tower 4, and 5 bottoms are sent into from the absorption tower; This moment, reaction product became formaldehyde solution after the absorption of process spray water in absorption tower 5, and the then a part of circulation of 5 top tail gas discharged is transported to the suphtr 2 from the absorption tower, and another part then is sent to vent gas treatment tower 6; In above-mentioned technological process, the spray water in the absorption tower 5 is sneaked into aminoplastics waste water, and this aminoplastics waste water enters into absorption tower 5; Mix with spray water through handling the back earlier through the clean-up stage in the absorption tower 57; And then thereby spray absorbs and to obtain 37%～50% formaldehyde solution, but wherein also has about 1% methyl alcohol, this formaldehyde solution continued to be sent to the inlet at the top of methyl alcohol knockout tower; Through after the separate absorbent; Methanol content wherein can be reduced to below 0.2%, thereby meets product requirement, and flows out from the separator outlet at bottom; And from separator top exit tail gas discharged part runner suphtr 2, form quaternary gas with its excess-three kind, remainder is transported to burn processing in the vent gas treatment tower 6.
In the said process, the methanol concentration in the original product is reduced to below 0.2% by about 1%; And owing to mainly contain the methyl alcohol about 1.5～2.0% in the aminoplastics waste water; And contain the enough gasification of methanol of a large amount of heats (the methanol gasifying temperature is about 60 ℃) in the waste water; Therefore utilize this heat heating methanol raw material in vaporizer 1 to reduce the steam that Formaldehyde Production consumed; Need the quantity of steam of 445Kg to drop to 435Kg by 1 ton of formaldehyde of original every production, partly adopt this waste water absorption to obtain the formaldehyde solution product in addition and also reduced discharge of wastewater, reduce environmental pollution; And the formaldehyde solution of producing after this waste water process purifying treatment is National standard also, the final energy-saving and emission-reduction purpose that realizes production.
Claims (3)
1. Formaldehyde Production process unit that low methyl alcohol is residual; It is characterized in that: comprise vaporizer, suphtr, spark arrester, oxidizing reaction tower and absorption tower, said evaporator inlet is connected with the methanol feedstock jar, and its outlet is communicated with the top of suphtr, spark arrester and oxidizing reaction tower successively; The outlet at bottom of said oxidizing reaction tower is communicated with the absorption tower bottom inlet; The top, absorption tower is provided with two outlets, and one of them outlet is connected with the steam-in of vaporizer through threading a pipe, and the another one outlet then is connected with the inlet of methanol separator; Said methanol separator top exit then is connected with the vent gas treatment tower, and the methanol separator bottom is provided with products export.
2. according to the residual Formaldehyde Production process unit of the said low methyl alcohol of claim 1; It is characterized in that: also be provided with the aminoplastics waterwater entrance in the said absorption tower; Be provided with clean-up stage between said aminoplastics waterwater entrance and the spray section, this clean-up stage is filled with structured packing.
3. according to the residual Formaldehyde Production process unit of the said low methyl alcohol of claim 2, it is characterized in that: fill by structured packing in the said methanol separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220159749 CN202576297U (en) | 2012-04-16 | 2012-04-16 | Formaldehyde production process device with low methanol residue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220159749 CN202576297U (en) | 2012-04-16 | 2012-04-16 | Formaldehyde production process device with low methanol residue |
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| CN202576297U true CN202576297U (en) | 2012-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220159749 Expired - Fee Related CN202576297U (en) | 2012-04-16 | 2012-04-16 | Formaldehyde production process device with low methanol residue |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103086854A (en) * | 2013-02-26 | 2013-05-08 | 河北凯跃化工集团有限公司 | Method and device for reducing methanol content in formaldehyde process by silver method |
-
2012
- 2012-04-16 CN CN 201220159749 patent/CN202576297U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103086854A (en) * | 2013-02-26 | 2013-05-08 | 河北凯跃化工集团有限公司 | Method and device for reducing methanol content in formaldehyde process by silver method |
| CN103086854B (en) * | 2013-02-26 | 2015-05-13 | 河北凯跃化工集团有限公司 | Method and device for reducing methanol content in formaldehyde process by silver method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20180416 |
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| CF01 | Termination of patent right due to non-payment of annual fee |