CN103752139B - A kind of formic acid acidification of acidification section device for absorbing tail gas and absorption process - Google Patents
A kind of formic acid acidification of acidification section device for absorbing tail gas and absorption process Download PDFInfo
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- CN103752139B CN103752139B CN201310726814.9A CN201310726814A CN103752139B CN 103752139 B CN103752139 B CN 103752139B CN 201310726814 A CN201310726814 A CN 201310726814A CN 103752139 B CN103752139 B CN 103752139B
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Abstract
The present invention relates to a kind of formic acid acidification of acidification section device for absorbing tail gas and absorption process, the lower entrances of a, stage falling-film absorber is connected with acidifying still blow-down pipe gathering tube, and three grades of falling liquid film level absorber outlets connect surge tank and air-introduced machine; B, a secondary cycle pump inlet are connected with a secondary cycle groove, export and be connected with a secondary falling liquid film level absorber top; Three grades of pump inlet are connected with three grades of circulating slots, export and be connected with three grades of falling liquid film level absorber tops, and three grades of circulating-pump outlets are connected with a secondary cycle groove; The bottom of c, every grade of falling-film absorber is connected with circulating slot.---secondary falling-film absorber---three grades of falling-film absorbers---surge tank---air-introduced machine---tail gas absorption tower---emptying that the trend of acidifying still emptying end gas of the present invention is: stage falling-film absorber.The invention has the advantages that: equipment is simple, easy to operate, safe and reliable, cost is low, and the product treatment rate of recovery is high, and operating cost and environmental pollution significantly reduce.
Description
Technical field:
The present invention relates to a kind of chemical production equipment and production method, particularly acidification of acidification section device for absorbing tail gas and absorption process in a kind of formic acid production.
Background technology:
Formic acid, also known as formic acid, in chemical industry, formic acid be used to rubber, medicine, fuel, leather kind industry.Along with greatly developing of China's animal husbandry, formic acid will have larger potential market as the storage agent of ensilage and crops, mould inhibitor.Along with domestic to the great attention of environmental protection, the application market prospect of formic acid in the industry such as process hides and printing and dyeing is better.
The synthetic method of formic acid is a lot, at present domestic and international usual sodium formate method, methyl formate hydrolysis method, light oil liquid phase oxidation etc.Current use sodium formate method produces formic acid, and the method cost is low, easy to operate, and the solid slag of generation and sodium sulphate are a kind of important chemical industry supplementary material equally, sells as byproduct packaging.
Main course of reaction: 2HCOONa+H2SO4 (dense)===2HCOOH+Na2SO4
Course of reaction needs lower than 60 DEG C, otherwise H2SO4 can decompose by catalysis HCOOH.In this method, formic acid enters three grades of absorption plants by distillation under vacuum first in gaseous form after the operation process such as acidifying, distillation, purification, can enter in concentrated acid or dilute acid bath after concentration is qualified, sells to reasonable concentration storage finally by allotment.
Existing formic acid production acidification of acidification section acidifying still emptying end gas, by negative pressure jet pump, the tail gas that the reaction of acidifying still produces is taken away, in three touries, the aqueous solution absorbs one by one, the method technology is single, formic acid in absorption tail gas that can not be fully effective, and in jet pump pump box, water circulation liquid cycle period is short, temperature is high, the formic acid smell given out brings pollution to a certain degree to operating environment.Simultaneously three grades of absorbing liquids and pump box Inner eycle liquid replacement operator frequency high, in equipment use process, electric energy consumption is high, does not find associated solutions through extensive search.
Summary of the invention:
Object of the present invention will overcome that assimilation effect in prior art is poor exactly, and absorbing liquid circulation fluid replacement operator frequency is high, and equipment use electric energy consumption is high, is unfavorable for the shortcoming of environmental protection and consumption reduction and a kind of formic acid acidification of acidification section device for absorbing tail gas proposed and absorption process.
To achieve these goals, the present invention adopts following technical scheme:
A kind of formic acid acidification of acidification section device for absorbing tail gas, is characterized in that comprising:
A, stage falling-film absorber, secondary falling-film absorber and three grades of falling-film absorbers, the lower entrances of stage falling-film absorber is connected with acidifying still blow-down pipe gathering tube, three grades of falling liquid film level absorber outlets connect surge tank by pipeline, surge tank is connected with air-introduced machine by pipeline, and previous stage falling-film absorber top exit is connected with rear stage falling-film absorber lower inlet by pipeline;
B, a secondary cycle pump and three grades of circulating pumps, a secondary cycle groove corresponding with it and three grades of circulating slots, the import of one secondary cycle pump is connected with a secondary cycle groove by pipeline, and a secondary cycle delivery side of pump is connected with the top of stage falling-film level absorber and secondary falling liquid film level absorber respectively by pipeline; Three grades of pump inlet are connected with three grades of circulating slots by pipeline, and three grades of circulating-pump outlets are connected with three grades of falling liquid film level absorber tops by pipeline, and three grades of circulating-pump outlets are connected with a secondary cycle groove;
C, stage falling-film absorber are connected with a secondary cycle groove and three grades of circulating slots respectively by pipeline with the bottom of secondary falling-film absorber;
D, a secondary cycle delivery side of pump are connected with purification still.
2, a formic acid acidification of acidification section method for recovering tail gas, is characterized in that comprising the following steps:
A, acidification of acidification section 12 acidifying still emptying formic acid tail gas, utilize air-introduced machine to extract out, through three grades of falling film absorbing devices, carry out absorption tail gas;
B, through step a, acidifying still emptying end gas is introduced in falling film absorbing device, first formic acid tail gas enters bottom a secondary falling-film absorber, one secondary cycle pump delivers to stage falling-film absorber absorbing liquid in circulating slot, flow from top to bottom in secondary falling-film absorber top, counter current contacting absorption is carried out from bottom to top with tail gas, secondly through stage falling-film absorber, formic acid tail gas after secondary falling-film absorber absorbs, enter bottom three grades of falling-film absorbers, by three grades of circulating pumps, absorbing liquid in three grades of circulating slots is delivered to three grades of falling-film absorber tops equally to flow from top to bottom, with stage falling-film absorber, after secondary level falling-film absorber absorbs, tail gas carries out counter current contacting absorption from bottom to top, after last three grades of level falling-film absorbers absorb, acidifying tail gas is delivered in system tail gas first grade absorption tower through surge tank buffering.
C, I and II falling film absorption circulating slot concentration index control≤60%, three grades of falling film absorption circulating slot concentration indexs and control≤30%, and surge tank concentration index controls≤5%.One secondary cycle groove absorbing liquid reaches capacity, and concentration 60% is rear replaces to purification still complex acid in time, and three grades of circulating slot absorbing liquids reach capacity, and concentration 30% is rear replaces in time in I and II circulating slot, in three grades of circulating slots, mend fresh demineralized water.
D, three grades of falling-film absorber circulating absorption solutions are normally cooled by recirculated water or cooling water, reduce circulating absorption solution own temperature, increase absorbing liquid assimilation effect.
After a, b, c, Step d, a whole set of acidification system emptying formic acid tail gas is fully reclaimed, and reclaims formic acid every day and save power consumption to bring certain economic benefit to formic acid device.
The invention has the advantages that: the equipment of use is simple, and easy to operate, safe and reliable, cost is low, and the product treatment rate of recovery is high, and operating cost and environmental pollution significantly reduce.
Accompanying drawing illustrates:
Fig. 1 is formic acid acidification of acidification section tail gas absorbing system figure of the present invention.
Detailed description of the invention:
As shown in Figure 1, the invention provides a kind of formic acid acidification of acidification section device for absorbing tail gas, it comprises:
A, 12 acidifying still blow-down pipes gather to house steward, be connected with falling film absorbing device, falling film absorbing device is made up of through placed in series stage falling-film absorber, secondary falling-film absorber and three grades of falling-film absorbers, three grades of falling-film absorber outlets are finally connected with air-introduced machine import through surge tank, remove system tail gas first grade absorption tower, substantially reclaim acidifying still emptying end gas completely, reduce production cost.
B, a secondary cycle pump inlet are connected with a secondary cycle groove, and outlet is connected with stage falling-film absorber and secondary falling-film absorber top, and three grades of pump inlet are connected with three grades of circulating slots, and outlet is connected with three grades of falling-film absorber tops.One secondary cycle groove and three grades of circulating slots are interconnected by three grades of circulating pumps, are convenient to circulating absorption solution displacement.
Formic acid acidification of acidification section tail gas absorption method provided by the invention, as shown in Figure 1,12 acidifying still emptying formic acid tail gas are through air-introduced machine, enter falling film absorbing device to reclaim, one secondary cycle groove Inner eycle liquid (concentration 60%) displacement is to purifying still (i.e. PP tank) complex acid, every 2 days (48 hours) displacement 1.5 sides, amount to concentration 85% formic acid and are calculated as 1.05 tons, monthly about 15 tons, recyclable formic acid.
Original formic acid acidifying emptying end gas retracting device has 4 vacuum pump set (spray as adopted negative pressure and absorb), every platform vavuum pump is furnished with power of motor 7.5kw, add up to 30kw, now transform falling film absorbing device and have 2 circulating pumps (every platform pump motor power 3kw) and 1 air-introduced machine (power of motor 4kw), after transformation, falling film absorbing device equipment electric consumption saves 20kw/ hour, adds up to and monthly saves power consumption 20*24*30=14400kw
In process,---surge tank---air-introduced machine---tail gas absorption tower---emptying that the trend of acidifying still emptying end gas is (stage falling-film absorber, secondary falling-film absorber, three grades of falling-film absorbers).
Claims (1)
1. a formic acid acidification of acidification section tail gas absorption method, have employed a kind of formic acid acidification of acidification section device for absorbing tail gas, it forms by with lower part:
A, stage falling-film absorber, secondary falling-film absorber and three grades of falling-film absorbers, the lower entrances of stage falling-film absorber is connected with acidifying still blow-down pipe gathering tube, three grades of falling-film absorber outlets connect surge tank by pipeline, surge tank is connected with air-introduced machine by pipeline, and previous stage falling-film absorber top exit is connected with rear stage falling-film absorber lower inlet by pipeline;
B, a secondary cycle pump and three grades of circulating pumps, a secondary cycle groove corresponding with it and three grades of circulating slots, the import of one secondary cycle pump is connected with a secondary cycle groove by pipeline, and a secondary cycle delivery side of pump is connected with the top of stage falling-film absorber and secondary falling-film absorber respectively by pipeline; Three grades of pump inlet are connected with three grades of circulating slots by pipeline, and three grades of circulating-pump outlets are connected with three grades of falling-film absorber tops by pipeline, and three grades of circulating-pump outlets are connected with a secondary cycle groove;
C, stage falling-film absorber are connected with a secondary cycle groove and three grades of circulating slots respectively by pipeline with the bottom of secondary falling-film absorber;
D, a secondary cycle delivery side of pump are connected with purification still;
It is characterized in that adopting following steps:
A, acidification of acidification section 12 acidifying still emptying formic acid tail gas, utilize air-introduced machine to extract out, be incorporated in three grades of falling film absorbing devices, carry out absorption tail gas;
B, three grades of falling film absorbing devices comprise stage falling-film absorber, secondary falling-film absorber and three grades of falling-film absorbers, first formic acid tail gas enters stage falling-film absorber bottom, tail gas enters bottom secondary falling-film absorber after flowing out via stage falling-film absorber overhead again, and tail gas enters bottom three grades of falling-film absorbers after flowing out via secondary falling-film absorber top again; By a secondary cycle pump, absorbing liquid in circulating slot delivered to stage falling-film absorber, flow from top to bottom in secondary falling-film absorber top, with tail
Gas carries out counter current contacting absorption from bottom to top;
Secondly the formic acid tail gas after stage falling-film absorber, secondary falling-film absorber absorb, enter bottom three grades of falling-film absorbers, by three grades of circulating pumps, absorbing liquid in three grades of circulating slots is delivered to three grades of falling-film absorber tops equally to flow from top to bottom, after absorbing with stage falling-film absorber, secondary level falling-film absorber, tail gas carries out counter current contacting absorption from bottom to top, and after last three grades of falling-film absorbers absorb, acidifying tail gas is delivered in system tail gas first grade absorption tower through surge tank buffering;
C, secondary cycle groove formic acid concn norm controlling≤60%, three grades of circulating slot formic acid concn norm controlling≤30%, surge tank formic acid concn norm controlling≤5%; One secondary cycle groove formic acid absorbing liquid reaches capacity, and concentration 60% is rear replaces to purification still complex acid in time, and three grades of circulating slot formic acid absorbing liquids reach capacity, and concentration 30% is rear replaces in time in a secondary cycle groove, in three grades of circulating slots, mend fresh demineralized water;
D, three grades of falling-film absorber circulating absorption solutions are normally cooled by recirculated water or cooling water, reduce circulating absorption solution own temperature, increase absorbing liquid assimilation effect.
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| CN104096468B (en) * | 2014-06-07 | 2019-03-26 | 李安民 | Produce the tail gas absorption technology and equipment of two (trichloromethyl) carbonic esters |
| CN104528767B (en) * | 2014-12-24 | 2016-03-16 | 安徽金禾实业股份有限公司 | A kind of formic acid produces method and the device of saltcake workshop section conveying saltcake material |
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| CN111569627A (en) * | 2020-04-30 | 2020-08-25 | 浙江省天正设计工程有限公司 | Efficient recovery device and process for continuous double-suction treatment of tail gas |
| CN112705013B (en) * | 2020-12-25 | 2023-04-07 | 临沭县华盛化工有限公司 | Process for absorbing hydrogen chloride gas by 'double-serial-parallel' alcohol |
| CN115041002B (en) * | 2022-05-09 | 2024-01-26 | 新疆晶硕新材料有限公司 | Tail gas treatment method in zircon sand chlorination production |
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