Method for producing formaldehyde and urea formaldehyde pre-concentrated liquid on super-large scale

A urea-formaldehyde pre-condensation liquid and formaldehyde technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of carbon-based compounds, etc., can solve the problems of high power consumption, high product acid value, low methanol content, etc., and achieve energy recovery. The effect of high degree, high conversion rate of raw materials and excellent product quality

Inactive Publication Date: 2017-12-29
赵达扬 +1
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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, the concentration of formaldehyde can be adjusted, and the degree of automation is high; 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. It is only suitable for polyoxymethylene, Paraformaldehyde and other fields that use high-concentration formaldehyde as raw materials
[0003] In recent years, with the growing market demand for formaldehyde, especially the demand for high-concentration and high-quality formaldehyde products has increased significantl...

Method used

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  • Method for producing formaldehyde and urea formaldehyde pre-concentrated liquid on super-large scale
  • Method for producing formaldehyde and urea formaldehyde pre-concentrated liquid on super-large scale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The invention provides a kind of method of producing formaldehyde and urea-formaldehyde precondensate, comprises the following steps:

[0049] S101: prepare and gasify raw material methanol to obtain mixed raw material gas; the concentration of methanol in the mixed raw material gas is 10%, the volume concentration of oxygen is about 9%, and the rest is inert gas nitrogen.

[0050] S102: Fully mix and heat the mixed raw material gas in the steam generator to form a mixed raw material gas flow suitable for formaldehyde production. The mixed gas enters the series of formaldehyde reactors in turn, and under the action of the iron-molybdenum catalyst, in the reaction environment of 200 ° C The reaction is carried out to convert the raw material gas rich in methanol into reaction gas containing formaldehyde, methanol and other substances. Among them, the formaldehyde reactor uses a fixed-bed shell-and-tube heat exchanger, the tube side is filled with formaldehyde catalyst, a...

Embodiment 2

[0055] The invention provides a kind of method of producing formaldehyde and urea-formaldehyde precondensate, comprises the following steps:

[0056] S101: Prepare and gasify the raw material methanol to obtain a mixed raw material gas; the concentration of methanol in the mixed raw material gas is 11%, the volume concentration of oxygen is about 9%, and the rest is inert gas nitrogen.

[0057] S102: Fully mix and heat the mixed raw material gas in the steam generator to form a mixed raw material gas flow suitable for formaldehyde production. The mixed gas enters the series-connected formaldehyde reactors in sequence, and under the action of the iron-molybdenum catalyst, in the reaction environment of 350 ° C The reaction is carried out to convert the raw material gas rich in methanol into reaction gas containing formaldehyde, methanol and other substances. Among them, the formaldehyde reactor uses a fixed-bed shell-and-tube heat exchanger, the tube side is filled with formald...

Embodiment 3

[0068]The invention provides a kind of method of producing formaldehyde and urea-formaldehyde precondensate, comprises the following steps:

[0069] S101: prepare and gasify raw material methanol to obtain mixed raw material gas; the concentration of methanol in the mixed raw material gas is 8%, the volume concentration of oxygen is about 12%, and the rest is inert gas nitrogen.

[0070] S102: Fully mix and heat the mixed raw material gas in the steam generator to form a mixed raw material gas flow suitable for formaldehyde production. The mixed gas enters the parallel formaldehyde reactors in sequence, and under the action of the iron-molybdenum catalyst, in the reaction environment of 280 ° C The reaction is carried out to convert the raw material gas rich in methanol into reaction gas containing formaldehyde, methanol and other substances. Among them, the formaldehyde reactor uses a fixed-bed shell-and-tube heat exchanger, the tube side is filled with formaldehyde catalyst,...

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Abstract

The invention relates to a method for producing a formaldehyde and urea formaldehyde pre-concentrated liquid. The method comprises steps as follows: S101: methanol is gasified and mixed raw gas is obtained; the mixed raw gas contains methanol with the concentration being 6%-11%, oxygen with the concentration being 9%-13% and the balance of inert gas; S102: the raw gas is sent into a reactor and subjected to a reaction at the temperature of 200-400 DEG C under the action of an iron-molybdenum catalyst; S103: a reaction product is sent into an absorption system to be absorbed by a preset solution, and the formaldehyde or urea formaldehyde pre-concentrated liquid is obtained finally. The provided process for producing oxidation-method (namely, an iron-molybdenum method) formaldehyde on a super-large scale has the outstanding advantages of being high in conversion rate, yield, product concentration and energy recovery degree, excellent in product quality, free of liquid wastes and solid wastes during normal production and the like and is particularly suitable for demands of the large modern chemical industry, the dilemma of extended monopoly of abroad iron-molybdenum method formaldehyde processes is thoroughly broken through, and the blank of the independent intelligent property right of the process in China is filled up.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a method for ultra-large-scale production of formaldehyde and urea-formaldehyde precondensate. 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. The disadvantages are high methanol unit consumption, high methanol content in formaldehyde, low formaldehyde concentration (about 37%), and low safety. The maximum capacity of a single device is 120,000 tons. Improvements to the traditional silver method, such as tail gas circulation and flue gas circulation, although this method can increase the concentration of formaldehyde, cannot effectively reduce the methanol content in the product; in addition, if the reaction temperature and oxygen-alcohol ratio are increased to red...

Claims

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Application Information

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IPC IPC(8): C07C45/38C07C47/052C08G12/12
CPCC07C45/38C08G12/12C07C47/04
Inventor 赵达扬赵伟彪梁金春
Owner 赵达扬
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