Recovery method of tail gas in formic acid production
A recovery method and technology for formic acid, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of poor absorption effect, unfavorable environmental protection and consumption reduction, and the inability to recycle the absorption liquid, and achieve low cost and operation. Cost and environmental load reduction, easy operation effect
Inactive Publication Date: 2012-04-25
ANHUI JINGHE IND
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[0009] The purpose of the present invention is to overcome the shortcomings of poor absorption effect in the prior art, the absorption liquid cannot be recycled, and it is not conducive to environmental protection and consumption reduction, and proposes a method and device for recovering tail gas in formic acid production
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[0022] Such as figure 1 As shown, the present invention provides a tail gas recovery device in the production of formic acid, which includes:
[0023] a. The inlet of the gravity sedimentation dust collector is connected with the induced draft fan, and the outlet is connected with the bottom of the primary absorption tower through a pipeline. The precipitation of sodium sulfate in the gravity settling dust collector can basically completely eliminate the influence of sodium sulfate on the absorption liquid, ensure the recycling use of the absorption liquid, and improve the comprehensive acceptance rate of the product.
[0024] b. The first-stage absorption tower, the bottom of which is connected to the outlet of the gravity sedimentation dust collector through a pipeline, the first-stage absorption tower uses a circulating spray pump to spray and absorb formic acid gas in the tower, and the absorption tower is forced by an induced draft fan to achieve Very good absorption effect. ...
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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: [0001] The invention designs a method and device for recovering tail gas from formic acid production. Background technique: [0002] Formic acid, also known as formic acid, is used in rubber, medicine, fuel, and leather industries in the chemical industry. With the vigorous development of my country's animal husbandry, formic acid as a storage agent and antifungal agent for silage and crops will have a larger potential market. With the great attention paid to environmental protection in China, the application market prospects of formic acid in leather making and printing and dyeing industries are better. [0003] There are many methods for synthesizing formic acid. At present, sodium formate method, methyl formate hydrolysis method, light oil liquid phase oxidation method are commonly used at home and abroad. At present, the sodium formate method is used to prepare formic acid, which is low-cost and easy to operate. The solid slag produced, namely sodium sulfate,...
Claims
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Inventor 杨永林
Owner ANHUI JINGHE IND