CN102423577A - Recovery method of tail gas in formic acid production - Google Patents
Recovery method of tail gas in formic acid production Download PDFInfo
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- CN102423577A CN102423577A CN2011102638723A CN201110263872A CN102423577A CN 102423577 A CN102423577 A CN 102423577A CN 2011102638723 A CN2011102638723 A CN 2011102638723A CN 201110263872 A CN201110263872 A CN 201110263872A CN 102423577 A CN102423577 A CN 102423577A
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- formic acid
- tail gas
- absorption tower
- acid tail
- tower
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Abstract
The invention relates to a recovery method of tail gas in formic acid production, comprising the following steps that: a, formic acid tail gas is absorbed in a gravity settling deduster by an induced draught fan; b, the formic acid tail gas enters in the bottom of a first-stage absorbing tower, the formic acid tail gas is sprayed and absorbed by a spray device, when the concentration of the absorbed formic acid in the tower reaches 15-20 %, the formic acid tail gas is pumped into a third-stage absorbing tower to be used as a base material, and the rest formic acid tail gas is conveyed into a second-stage absorbing tower; and c, the formic acid tail gas is continuously sprayed and absorbed by a circulating spray device in the second-stage absorbing tower, then the formic acid tail gas is discharged to atmosphere, when the concentration of the absorbed formic acid in the second-stage absorbing tower is about 1-1.5 %, the formic acid tail gas is pumped into the first-stage absorbing tower to be used as a base material, and the second-stage absorbing tower is emptied and then fresh desalting water is added. The invention has the following advantages of simple devices, convenient operation, safety and reliability, low cost, high product processing recovery rate, and greatly reduced operating cost and environmental load.
Description
Technical field:
The present invention designs recovery method and the device that a kind of formic acid is produced tail gas.
Background technology:
Formic acid, claim formic acid again, in chemical industry, formic acid is used to rubber, medicine, fuel, the industry of leather kind.Along with greatly developing of China's animal husbandry, formic acid will have bigger potential market as storage agent, the mould inhibitor of ensilage and crops.Along with domestic great attention to environmental protection, the application market prospect of formic acid in industries such as process hides and printing and dyeing is better.
The synthetic method of formic acid is a lot, at present both at home and abroad usually with sodium formate method, methyl formate hydrolysis method, light oil liquid phase oxidation etc.Use sodium formate method to produce formic acid at present, the method cost is low, and is easy to operate, and the solid slag of generation is that sodium sulphate is a kind of important chemical supplementary material equally, sells as the byproduct packing.
Main course of reaction:
2HCOONa+H2SO4 (dense)===2HCOOH+Na2SO4
(process need is lower than 60 ℃, otherwise H2SO4 meeting catalysis HCOOH decomposes)
In this method, formic acid passes through distillation under vacuum elder generation with gas form and gets into three grades of absorption plants after operations such as acidifying, distillation, purification are handled the back, can enter in concentrated acid or the dilute acid bath after concentration is qualified, after allocate to reasonable concentration storage sale.
Existing formic acid production technology tail gas only drenches the absorption tower through simple water to be handled; This method and technology is single; Can't effectively absorb the formic acid in the tail gas; And the sodium sulphate dust that is mixed with in the tail gas directly gets in the absorption liquid of absorption tower especially, causes the interior formic acid of absorption liquid colourity severe overweight absorption liquid to recycle, and has increased the pressure of Sewage Disposal.Do not absorb completely that formic acid tail gas has brought pollution to a certain degree to atmosphere especially,, find relevant solution through extensive search to the problems referred to above.
Summary of the invention:
It is poor that the object of the invention will overcome in the prior art assimilation effect exactly, and absorption liquid can't recycle, be unfavorable for the shortcoming of environmental protection and consumption reduction and a kind of formic acid of proposing produce in the recovery method and the device of tail gas.
To achieve these goals, the present invention adopts following technical scheme:
The environment protection method of tail gas recycle during a kind of formic acid is produced is characterized in that may further comprise the steps:
A, contain formic acid tail gas to what separate through cyclone separator, utilize air-introduced machine to suck the gravitational settling deduster, the dust in the formic acid tail gas is through the gravity settling chamber natural subsidence;
B, the formic acid tail gas after step a separates; Get into the first grade absorption tower bottom; Spray equipment in the first grade absorption tower sprays absorption to formic acid gas wherein; After the systemic formic acid concn of tower reaches 15%-20%, utilize vavuum pump that it is sucked in three grades of absorption plants of acidifying still emptying and do bed material, remaining formic acid tail gas is transported into two-level absorption tower;
C, two-level absorption tower receive the formic acid tail gas of sending here from first grade absorption tower from the bottom; Circulating sprayer in the two-level absorption tower continues spray to formic acid tail gas and absorbs; Subsequently empty emptying is discharged, the formic acid concn that absorbs in the two-level absorption tower is about 1%-1.5%, utilizes pump to squeeze into first grade absorption tower and does bed material; Mend fresh demineralized water after the two-level absorption tower emptying, liquid level is at 1m.
After a, b, c step, whole formic acid production procedure can realize the zero-emission of the three wastes basically, and sodium sulphate and the formic acid that reclaims every day have also caused certain economic benefits.
The present invention also comprises a kind of used device of method for recovering tail gas in the said formic acid production of realizing, this device comprises:
A, gravitational settling deduster, its import link to each other, export with air-introduced machine through pipeline and link to each other with the first grade absorption tower bottom.Sodium sulphate sedimentation in the gravitational settling deduster can be eliminated the influence of sodium sulphate to absorption liquid basically fully, has guaranteed recycling of absorption liquid, and that has improved product comprehensively receives rate.
B, first grade absorption tower, its bottom links to each other with the outlet of gravitational settling deduster through pipeline, and first grade absorption tower adopts the circulated sprinkling pump that formic acid gas in the tower is sprayed absorption, and the absorption tower can reach good assimilation effect through air-introduced machine forced convertion bleed.
C, two-level absorption tower, its bottom links to each other with the first grade absorption tower top exit through pipeline, and two-level absorption tower adopts the circulated sprinkling pump that formic acid gas in the tower is sprayed absorption.
The invention has the advantages that: the equipment of use is simple, and is easy to operate, safe and reliable, and cost is low, and the product treatment rate of recovery is high, and operating cost and carrying capacity of environment significantly reduce.
Description of drawings:
Fig. 1 is the system diagram of device for recovering tail gas;
The specific embodiment:
As shown in Figure 1, the invention provides device for recovering tail gas in a kind of formic acid production, this device comprises:
A, gravitational settling deduster, its import link to each other, export with air-introduced machine through pipeline and link to each other with the first grade absorption tower bottom.Sodium sulphate sedimentation in the gravitational settling deduster can be eliminated the influence of sodium sulphate to absorption liquid basically fully, has guaranteed recycling of absorption liquid, and that has improved product comprehensively receives rate.
B, first grade absorption tower, its bottom links to each other with the outlet of gravitational settling deduster through pipeline, and first grade absorption tower adopts the circulated sprinkling pump that formic acid gas in the tower is sprayed absorption, and the absorption tower can reach good assimilation effect through air-introduced machine forced convertion bleed.
C, two-level absorption tower, its bottom links to each other with the first grade absorption tower top exit through pipeline, and two-level absorption tower adopts the circulated sprinkling pump that formic acid gas in the tower is sprayed absorption.
Formic acid provided by the invention is produced the recovery method of tail gas, and is as shown in Figure 1, and formic acid tail gas gets into the dust setting chamber's reclaim sulfuric acid sodium dust in the gravitational settling deduster, the recyclable 8-15kg sodium sulphate of per tour (8 hours) through air-introduced machine.Clean formic acid tail gas gets into first grade absorption tower continuously; Utilize concentration to be about 1.5% two-level absorption tower absorption liquid circulation absorption; After about 24 hours; Formic acid concn can reach 15%-20% in the first grade absorption tower, opens the valve that is connected of three grades of absorption plants of acidifying still air defense and first grade absorption tower this moment, utilizes vavuum pump that three grades of absorption plants of first grade absorption tower absorption liquid suction are subsequent use.The first grade absorption tower end of operation is opened two-level absorption tower charging line pump, and the absorption liquid of two-level absorption tower is squeezed into first grade absorption tower fully as bed material, and the demineralized water that two-level absorption tower injects the high liquid level of 1m continues to absorb.The appearance that effectively receives on I and II absorption tower is 2.5m3 in the process, and whole process need be opened the spray pump circulated sprinkling of two towers.
--tower----two towers---emptying that in the process, the trend of tail gas is air-introduced machine-expansion chamber;
The trend of absorption liquid is a demineralized water---three grades of absorption plants of two towers--tower--.
Claims (1)
1. a formic acid is produced the recovery method of tail gas, it is characterized in that may further comprise the steps:
A, contain formic acid tail gas to what separate, utilize air-introduced machine to suck the gravitational settling deduster, make dust in the formic acid tail gas through the gravity settling chamber natural subsidence through cyclone separator;
B, the formic acid tail gas after step a handles; Get into the first grade absorption tower bottom; Spray equipment in the first grade absorption tower sprays absorption to formic acid gas wherein; After the systemic formic acid concn of tower reaches 15%-20%, utilize vavuum pump that it is pumped in three grades of absorption plants and do bed material, remaining formic acid tail gas is transported into two-level absorption tower;
C, two-level absorption tower receive the formic acid tail gas of sending here from first grade absorption tower from the bottom; Circulating sprayer in the two-level absorption tower continues spray to formic acid tail gas and absorbs; Subsequently empty emptying is discharged, the formic acid concn that absorbs in the two-level absorption tower is about 1%-1.5%, utilizes pump to squeeze into first grade absorption tower and does bed material; Mend fresh demineralized water after the two-level absorption tower emptying, liquid level is at 1m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102638723A CN102423577A (en) | 2011-09-07 | 2011-09-07 | Recovery method of tail gas in formic acid production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102638723A CN102423577A (en) | 2011-09-07 | 2011-09-07 | Recovery method of tail gas in formic acid production |
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| CN102423577A true CN102423577A (en) | 2012-04-25 |
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| CN2011102638723A Pending CN102423577A (en) | 2011-09-07 | 2011-09-07 | Recovery method of tail gas in formic acid production |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103752139A (en) * | 2013-12-26 | 2014-04-30 | 安徽金禾实业股份有限公司 | Formic acid acidification working section tail gas absorption device and absorption method |
| CN105056706A (en) * | 2015-08-19 | 2015-11-18 | 常州大学 | Methanol waste gas recycling system based on secondary absorption |
| CN105289178A (en) * | 2015-11-09 | 2016-02-03 | 长沙奥佳信息科技有限公司 | Exhaust purification treatment device for environment-friendly printing and dyeing setting machine |
| CN110513709A (en) * | 2019-08-30 | 2019-11-29 | 王晶 | A kind of chimney sulphur removal dust-extraction unit controlling atmosphere pollution |
Citations (4)
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| US3950492A (en) * | 1974-02-11 | 1976-04-13 | Dr. C. Otto & Comp. G.M.B.H. | Process for removal of ammonia, hydrogen sulfide and hydrogen cyanide from gases containing these substances |
| CN1821205A (en) * | 2006-03-21 | 2006-08-23 | 尚微 | Process for producing formic acid |
| CN201147664Y (en) * | 2007-11-26 | 2008-11-12 | 高邮市有机化工厂 | Whole set processing equipment for hydrogenchloride and sulfuric dioxide tail gas |
| CN201952381U (en) * | 2010-12-23 | 2011-08-31 | 安徽金禾实业股份有限公司 | Mirabilite collection device for formic acid production by using sodium formate method |
-
2011
- 2011-09-07 CN CN2011102638723A patent/CN102423577A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3950492A (en) * | 1974-02-11 | 1976-04-13 | Dr. C. Otto & Comp. G.M.B.H. | Process for removal of ammonia, hydrogen sulfide and hydrogen cyanide from gases containing these substances |
| CN1821205A (en) * | 2006-03-21 | 2006-08-23 | 尚微 | Process for producing formic acid |
| CN201147664Y (en) * | 2007-11-26 | 2008-11-12 | 高邮市有机化工厂 | Whole set processing equipment for hydrogenchloride and sulfuric dioxide tail gas |
| CN201952381U (en) * | 2010-12-23 | 2011-08-31 | 安徽金禾实业股份有限公司 | Mirabilite collection device for formic acid production by using sodium formate method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103752139A (en) * | 2013-12-26 | 2014-04-30 | 安徽金禾实业股份有限公司 | Formic acid acidification working section tail gas absorption device and absorption method |
| CN103752139B (en) * | 2013-12-26 | 2016-03-09 | 安徽金禾实业股份有限公司 | A kind of formic acid acidification of acidification section device for absorbing tail gas and absorption process |
| CN105056706A (en) * | 2015-08-19 | 2015-11-18 | 常州大学 | Methanol waste gas recycling system based on secondary absorption |
| CN105289178A (en) * | 2015-11-09 | 2016-02-03 | 长沙奥佳信息科技有限公司 | Exhaust purification treatment device for environment-friendly printing and dyeing setting machine |
| CN110513709A (en) * | 2019-08-30 | 2019-11-29 | 王晶 | A kind of chimney sulphur removal dust-extraction unit controlling atmosphere pollution |
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Application publication date: 20120425 |