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Formaldehyde recycling device

A formaldehyde and absorption tower technology, applied in the field of formaldehyde recovery devices, can solve problems such as increasing product consumption, formaldehyde product waste, etc., and achieve the effects of reducing unit consumption, solving pipeline blockage, and reducing production costs

Inactive Publication Date: 2018-10-16
TIANJIN BOHUA YONGLI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production process of electrolytic silver catalytic oxidation of methanol to formaldehyde, the formaldehyde gas generated by the formaldehyde reactor enters the product storage tank after passing through the absorption tower, part of the tail gas at the top of the absorption tower returns to the formaldehyde reaction system to participate in the reaction, and the rest is sent to the torch by the blower for combustion , the tail gas condensate is discharged to the sewage tank for treatment, resulting in waste of unabsorbed formaldehyde products in the tail gas, increasing product consumption

Method used

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  • Formaldehyde recycling device

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Effect test

Embodiment 1

[0020] When the amount of methanol in the formaldehyde reactor is 4000kg / h, the amount of water added to the top of the formaldehyde absorption tower is 800kg / h, the formaldehyde content in the tail gas at the top of the tower is 0.08%, and the total amount entering the tail gas eliminator 2 is 9000Nm 3 / h, the amount of tail gas recovered by the reactor is 3600Nm 3 / h, the recovery system of this device completes a condensate delivery process every 4 hours in the condensate tank 6, and 1.8m of condensate can be recovered throughout the day 3 , equivalent to about 15kg of 100% formaldehyde.

Embodiment 2

[0022] When the amount of methanol in the formaldehyde reactor is 3000kg / h, the amount of water added to the top of the formaldehyde absorption tower is 600kg / h, the formaldehyde content in the tail gas at the top of the tower is 0.07%, and the total amount entering the tail gas eliminator 2 is 6500Nm 3 / h, the amount of tail gas recovered by the reactor is 2700Nm 3 / h, the recovery system of this device completes a condensate delivery process every 5 hours in the condensate tank 6, and 1.4m of condensate can be recovered throughout the day 3 , equivalent to about 10kg of 100% formaldehyde.

Embodiment 3

[0024] When the amount of methanol in the formaldehyde reactor is 2500kg / h, the amount of water added to the top of the formaldehyde absorption tower is 450kg / h, the formaldehyde content in the tail gas at the top of the tower is 0.06%, and the total amount entering the tail gas eliminator 2 is 5500Nm 3 / h, the amount of tail gas recovered by the reactor is 2200Nm 3 / h, the recovery system of this device completes a condensate delivery process every 6 hours in the condensate tank 6, and 1.2m of condensate can be recovered throughout the day 3 , equivalent to about 5kg of 100% formaldehyde.

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Abstract

The invention discloses a formaldehyde recycling device. The formaldehyde recycling device comprises a tail gas defogger, wherein a gas inlet of the tail gas defogger is communicated with a gas-phaseexit pipeline at the top part of an absorbing tower; a gas-phase exit pipeline at the top part of the tail gas defogger is communicated with an entry pipeline of an induced draft fan; a liquid-phase exit pipeline at the bottom part of the tail gas defogger is communicated with a liquid inlet of a condensate liquid tank; a liquid level meter is arranged in the condensate liquid tank; an exit pipeline of the condensate liquid tank is communicated with a circulating pipeline at the bottom part of the absorbing tower; the condensate liquid tank is connected with a factory air system through a gasintake pipeline; a self-powered type pressure adjusting valve and an electromagnetic switch valve are arranged on the gas intake pipeline, and the electromagnetic switch valve is used for controllingthe liquid level meter in an interlocking way. The formaldehyde recycling device has the advantages that the condensate liquid in the tail gas of the formaldehyde absorbing tower can be recycled on line, and the effects of automatic control and continuous production are realized.

Description

technical field [0001] The invention relates to a recycling device, in particular to a device for recycling formaldehyde. Background technique [0002] In the production process of electrolytic silver catalytic oxidation of methanol to formaldehyde, the formaldehyde gas generated by the formaldehyde reactor enters the product storage tank after passing through the absorption tower, part of the tail gas at the top of the absorption tower returns to the formaldehyde reaction system to participate in the reaction, and the rest is sent to the torch by the blower for combustion , The tail gas condensate is discharged to the sewage tank for treatment, resulting in waste of unabsorbed formaldehyde products in the tail gas and increasing product consumption. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a device for recovering formaldehyde, which can recover the tail gas condensate of the formal...

Claims

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Application Information

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IPC IPC(8): C07C45/80C07C47/058
CPCC07C45/78C07C45/783C07C47/04
Inventor 陈欣厉波廖新华龚光泽冯庆国王珺
Owner TIANJIN BOHUA YONGLI CHEM IND
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