Method for producing low alcohol, high concentration formaldehyde

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...

AI Technical Summary

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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