Apparatus and method to co-produce formaldehyde and UFC (urea-formaldehyde concentrate) by iron-molybdenum process

A formaldehyde, iron and molybdenum technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of carbon-based compounds, etc., can solve the problems of unstable domestic process technology, large one-time investment, high investment, and prolong the continuous operation period. , Increase the absorption efficiency, the effect of not easy to pulverize

Pending Publication Date: 2018-10-23
江苏道尔顿石化科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the one-time investment is large and the power consumption is high
However, the iron-molybdenum method formaldehyde plant has shortcomings and deficiencies such as unstable domestic process technology, high investment, and most of the core catalysts are controlled by foreign countries at the current stage.

Method used

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  • Apparatus and method to co-produce formaldehyde and UFC (urea-formaldehyde concentrate) by iron-molybdenum process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] like figure 1 Shown, a kind of iron-molybdenum method produces the device of formaldehyde co-production UFC, comprises methanol evaporator 4, methanol oxidizer 2 and absorption tower 6, the input end of methanol evaporator 4 is provided with methanol feed port and air feed port, The output end is connected to the input end of the methanol oxidizer 2, and the formaldehyde generated after the reaction of the mixed gas of methanol and air in the methanol oxidizer 2 enters the absorption tower 6 through the methanol evaporator 2 and the plate heat exchanger 3, and the absorption tower 6 is set There are urea feed port and lye feed port. A heat transfer oil condenser 1 is arranged on the methanol oxidizer 2 . The lye feed inlet is arranged at the top and the middle of the absorption tower 6 , and the urea feed inlet is arranged at the middle of the absorption tower 6 . The iron-molybdenum catalyst in the methanol oxidizer 2 has a cylindrical structure.

[0031] The method...

Embodiment 2

[0039] Embodiment 2: This embodiment produces the formaldehyde solution of 37-55% concentration and 85 concentration UFC urea-formaldehyde pre-condensed solution co-production.

[0040] The difference between this embodiment and embodiment 1 is that the mixture of urea and lye is put into the absorption tower according to the ratio, and the urea and formaldehyde solution react in the absorption tower to form UFC urea-formaldehyde pre-condensed liquid. Add urea and lye through the urea feed port and lye feed port, and the urea and formaldehyde solution react in the absorption tower to obtain urea-formaldehyde pre-condensed liquid UFC. The function of lye is to adjust the pH value of the system.

[0041] The iron-molybdenum method formaldehyde co-production UFC process device provided by the present invention has high conversion rate of methanol raw material, high specification of output steam, low consumption, long service life of catalyst, mild reaction conditions, and can meet...

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Abstract

An apparatus to co-produce formaldehyde and UFC (urea-formaldehyde concentrate) by iron-molybdenum process comprises a methanol evaporator, a methanol oxidizer and an absorbing column; fresh air and methanol vapor are mixed in the methanol evaporator, and formaldehyde is generated in the methanol oxidizer; formaldehyde vapor enters the absorbing column via the methanol evaporator; in the absorbingcolumn, the formaldehyde vapor is liquefied, and a liquid formaldehyde product is attained from the bottom; urea and an alkali liquid are added into the absorbing column to react with the formaldehyde to obtain UFC. The apparatus has the advantages that consumption indexes are good, single consumption of formaldehyde is 0.422-0.426 t, byproduct vapor specification is high, up to 22 bar 0.75 t / t,oxidation temperature is controlled to 245-380 DEG C, the methanol oxidizer has designed life up to 20 years and longer, the whole apparatus has designed life of not shorter than 35 years, the apparatus is suitable for flexibly producing formaldehyde products having a concentration of 37-55%, UFC can be produced just by proportionally adding an alkali liquid, and in order to further increase absorbing efficiency of process water, sodium hydroxide solution can be injected into the system to remove the byproduct, formic acid.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and specifically relates to a device and method for producing formaldehyde and co-producing UFC by an iron-molybdenum method. Background technique [0002] At present, one kind of industrial formaldehyde production in my country is "silver method formaldehyde" using silver catalyst, and the other is "iron molybdenum method formaldehyde" using iron molybdenum catalyst. The advantages of silver method formaldehyde are small investment and low power consumption. It has more advantages in large-scale devices (less than 50,000 tons / year), and the formaldehyde product has low acid content, which is suitable as a raw material for gas-phase method urotropine. However, the unit consumption of methanol is high (generally 0.445t / t), and the production capacity of a single set is limited (no more than 120,000 tons / year). Compared with silver-based formaldehyde, iron-molybdenum-based formaldehy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/38C07C47/052C08G12/12
CPCC07C45/38C08G12/12C07C47/04
Inventor 姜博文黄飞史泓
Owner 江苏道尔顿石化科技有限公司
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