Method for producing low alcohol, high concentration formaldehyde

A high-concentration formaldehyde and production method technology, applied in the field of industrial formaldehyde solution production, can solve the problems of low methanol content, high power consumption, low methanol unit consumption, etc., and achieve the effects of low methanol unit consumption, low investment and simple process

Inactive Publication Date: 2005-06-29
洪海玲
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Problems solved by technology

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, solid formaldehyde and other fields requiring high concentration of formaldehyde

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  • Method for producing low alcohol, high concentration formaldehyde
  • Method for producing low alcohol, high concentration formaldehyde

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Embodiment Construction

[0007] The implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0008] As shown in the figure, the technological process that the present invention implements is by evaporator 1, overheating, flame arresting, filter 6, oxidizer 8, dealcoholization tower 10, the first absorption tower 13, the second absorption tower 17 and pipeline 4,7 . The alcohol tower 10, the first absorption tower 13, and the second absorption tower 17 are connected by pipelines 7, 9, 12, and 16 respectively; communication pipelines 14, 15 are also provided between the dealcoholization tower 10 and the first absorption tower 13 ; The evaporator 1 is connected to the first absorption tower 13 through the pipelines 19 and 18, and the evaporator 1 and the second absorption tower 17 are connected through the pipeline 20. The number "2" in the figure is methanol, "3" is air, "5" is batching steam, "11" is product, and "21" is water absorption. The im...

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Abstract

The invention relates to a production method for producing low-alcohol and high-concentration formaldehyde. This method is an improvement on the traditional silver method. It uses the higher-temperature product gas after recovering heat from the waste heat boiler as a heat source to dealcoholize and dehydrate the formaldehyde in the first absorption tower, and then utilizes the gradual decrease in the temperature of the absorption system. Part of the alcohol-containing dilute formaldehyde extracted from a certain part of the absorption tower is returned to the evaporator to realize the cycle process of dealcoholization-reuse. According to the actual situation of formaldehyde production, the present invention skillfully integrates the rectification method into the formaldehyde production process. The process is simple, the unit consumption of methanol is low, the investment is low, and the energy utilization is reasonable. The method can be used to produce alcohol with low content and low alcohol content at a relatively low cost. Formaldehyde products with high formaldehyde concentration are suitable for popularization and application.

Description

Technical field: [0001] The invention relates to a method for producing industrial formaldehyde solution. Background technique: [0002] At present, there are mainly two methods of formaldehyde production at home and abroad to realize industrialized production: the silver method and the iron-molybdenum method. The advantages of the silver method are small investment, low power consumption, and low cost. The disadvantages are that the unit consumption of methanol is high, the content of methanol in formaldehyde is high, and the concentration of formaldehyde is low (about 37%). Some production and scientific research departments have improved the silver method by adopting tail gas circulation method and flue gas circulation method. Although these two methods can increase the concentration of formaldehyde, they fail to reduce the content of methanol, and the unit consumption of methanol is high, and the power consumption increases. There is also a method for rectifying formald...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/82C07C47/04
Inventor 洪海玲
Owner 洪海玲
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