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Production process and device of formaldehyde

A production device and production process technology, applied in the field of formaldehyde production process and device, can solve the problems of short life of waste heat boiler, increased power consumption, long process flow, etc. Effect

Inactive Publication Date: 2012-01-18
田宝峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increased power consumption due to the addition of exhaust gas or flue gas circulation fans
The advantage of the iron-molybdenum method is that the unit consumption of methanol is low, the content of methanol in formaldehyde is low, and the concentration of formaldehyde can be adjusted (37-55%). The disadvantage is that the acid value of the product is high, the investment is large, the power consumption is high, and the cost is high. Formaldehyde, paraformaldehyde and other fields that use high-concentration formaldehyde as raw materials
[0003] The above processes still have the problems of many equipments, long process flow and short service life of waste heat boilers.

Method used

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  • Production process and device of formaldehyde
  • Production process and device of formaldehyde
  • Production process and device of formaldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Embodiment 1, the formaldehyde production technique of the best implementation mode as shown in the figure, its technological process is as follows:

[0068] The air is filtered through the air filter, boosted by the Roots blower, and metered by the flowmeter into the bottom of the evaporator 1, and then reversely contacts the heated raffinate circulating fluid through the filler above, evaporates the methanol and water in the raffinate, and forms an air mixture Gas; the recovered dilute methanol and / or water containing a small amount of formaldehyde is metered into the evaporation section 5 of the evaporator through a flow meter; the methanol is fed from the methanol metering tank to the evaporator 1 evaporation section through a methanol pump, filtered by a filter, and metered by a flow meter 5. Mix with recovered methanol aqueous solution at the bottom of the evaporation section of the evaporator to form methanol mixed liquid; the raffinate circulating liquid is that ...

Embodiment 2

[0085] Same as the method in Example 1, the formed methanol-air-water vapor ternary gas is demisted and flame-retardant, mixed with a small amount of water vapor, the minimum amount of water vapor is zero, superheated to 110°C, and filtered throughout the process. The amount of methanol evaporation is controlled by adjusting the gas phase temperature and the equilibrium concentration of methanol in the evaporation section 5, so that the molar ratio of oxygen to methanol reaches 0.35. The ternary gas is catalyzed by a silver catalyst, and the dehydrogenation and oxidation reaction of methanol is carried out at a high temperature of 620 ° C to generate formaldehyde gas;

[0086] The higher-temperature generated gas leaving the waste heat boiler enters the absorption tower 3, and passes through the dealcoholization section 8, the first absorption section 9, the second absorption section 10, the third absorption section 11, and the water washing section 12 from bottom to top. Afte...

Embodiment 3

[0094] Same as the method in Example 1, the formed methanol-air-water vapor ternary gas is demisted and mixed with a small amount of water vapor, the minimum water vapor content is zero, superheated to 120°C, flame retardant, and filtered throughout the process. The amount of methanol evaporation is controlled by adjusting the vapor phase temperature and the equilibrium concentration of methanol in evaporation section 5, so that the molar ratio of oxygen to methanol reaches 0.37. The ternary gas is catalyzed by a silver catalyst, and the dehydrogenation and oxidation reaction of methanol is carried out at a high temperature of 630 ° C to generate formaldehyde gas;

[0095] The higher-temperature generated gas leaving the waste heat boiler enters the absorption tower 3, and passes through the dealcoholization section 8, the first absorption section 9, the second absorption section 10, the third absorption section 11, and the water washing section 12 from bottom to top. After le...

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Abstract

The invention relates to a production process and device of formaldehyde, in particular to a production process and device of the formaldehyde, which can realize circulated recycling of unreacted methanol. The process comprises the following steps of: defogging after heated methanol and recycled diluting methanol form a mixed gas with air in an evaporator; then adding a small amount of saturated steam or not adding the saturated steam; and heating and filtering; introducing the mixed gas to a reactor filled with a silver catalyst for reacting to generate a formaldehyde gas; recycling the waste heat of the generated gas to produce steam; then introducing the steam to an absorbing tower for absorbing; carrying out dealcholization on the extracted finished product by utilizing a high-temperature generated gas; and extracting diluting methanol from the upper part of the absorbing tower back to the evaporator for recycling. The device comprises three kinds of main equipment, such as the evaporator, the reactor and the absorbing tower as well as auxiliary equipment, such as a fan, a pump, a heat exchanger, and the like. The invention has the advantages of simple process, low unit product energy consumption and material consumption, high product concentration methanol content close to zero.

Description

technical field [0001] The invention relates to a formaldehyde production process and a device, in particular to a formaldehyde production process and a device that can recycle and utilize unreacted methanol under the condition of a low conversion rate of methanol to increase the yield of formaldehyde. Background technique [0002] At present, there are mainly two methods for producing formaldehyde at home and abroad: the silver method and the iron-molybdenum method. The advantages of the silver method are small investment and low power consumption, but the disadvantages are high methanol unit consumption, high methanol content in formaldehyde, and low formaldehyde concentration (about 37%). Improvements to the traditional silver method, such as tail gas circulation and flue gas circulation, although these two methods can increase the concentration of formaldehyde, they fail to effectively reduce the methanol content of the product. If the reaction temperature and oxygen-alc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/052C07C47/055C07C47/058C07C45/38C07C45/78
Inventor 田宝峰洪海玲
Owner 田宝峰
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