CN109574820A - A kind of production method of formaldehyde - Google Patents
A kind of production method of formaldehyde Download PDFInfo
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- CN109574820A CN109574820A CN201811504619.0A CN201811504619A CN109574820A CN 109574820 A CN109574820 A CN 109574820A CN 201811504619 A CN201811504619 A CN 201811504619A CN 109574820 A CN109574820 A CN 109574820A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
- C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
- C07C45/37—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups
- C07C45/38—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups being a primary hydroxyl group
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Abstract
The present invention relates to a kind of production methods of formaldehyde, comprising the following steps: 1) reactor is composed in series by pre-reactor, first and second reactor, and mixed gas successively passes through pre-reactor, first and second reactor；2) 140 ~ 150 DEG C of pre-reactor temperature, 150 ~ 270 DEG C of first reactor temperature, 275 ~ 425 DEG C of second reactor temperature.Absorption tower is composed in series by the first, second and third absorption tower；First absorption tower absorbing liquid repeats itself produces finished product formaldehyde, and second absorption tower absorbing liquid repeats itself extraction circulation fluid goes to the first absorption tower to absorb, and third absorption tower is absorbed using demineralized water, and absorbing liquid repeats itself extraction circulation fluid goes second absorption tower to absorb.The invention has the following advantages that 1, can directly produce the formaldehyde of 55% content, sour Jian Ce≤0.005%, Jia alcohol Han Liang≤0.5%；2, all iron-molybdic catalysts can be used；3, promotion system efficient low-consume is run, and improves productivity effect, reduces production cost.
Description
Technical field
The invention belongs to chemical production technical fields, are related to a kind of production method of formaldehyde.
Background technique
Formaldehyde, chemical formula HCHO, formula weight 30.03, also known as formaldehyde.Colourless gas has special penetrating odor, to human eye,
The irritating effect such as nose, 1.067 air=1 of gas relative density), 0.815g/cm3(-20 DEG C of fluid density).- 92 DEG C of fusing point,
- 19.5 DEG C of boiling point.Soluble easily in water and ethyl alcohol.The concentration of aqueous solution reaches as high as 55%, and usually 40%, referred to as formalin are commonly called as
Formalin (formalin) is the colourless liquid of irritating smell.Formaldehyde can be by methanol dehydrogenation under the metal catalytics such as silver, copper
Or oxidation is made, and can also be separated by hydrocarbon oxidation product.As pesticide and disinfectant, phenolic resin processed, Lauxite, polyvinyl,
The raw material of methenamine, pentaerythrite and dyestuff etc..Formaldehyde is important basic organic chemical industry raw material, it has also become large-scale production
With the chemical products of consumption, it is widely used in chemical industry, medicine, weaving, timber processing and petroleum industry.Modern industry formaldehyde is raw
It produces, mainly uses the oxidizing process preparation process using methanol as raw material, and iron and molybdenum oxides catalyst is used for methanol since nineteen fifty-two
After aoxidizing formaldehyde industrial production processed, with the advantage on its aspect of performance, extensive development and utilization have been obtained.
Iron-molybdic catalyst main source import at present, the World Catalyst supply of material is expensive, as the market demand gradually increases
Greatly, contradiction more highlights, and seems particularly significant so that researching and developing one kind and being able to use all iron and molybdenum oxides catalyst.
Summary of the invention:
It is an object of the invention to overcome the above problem of the existing technology, a kind of prepn. of formaldehyde is proposed.The present invention can
To be applicable in all formaldehyde iron-molybdic catalysts, system can not after solving the iron molybdenum method catalyst halt production of the former special formulation containing crome metal
The problem continued to run；The operation of promotion system efficient low-consume, improves productivity effect, reduces production cost.
The purpose of the present invention is what is be achieved by the following technical programs:
A kind of production method of formaldehyde, including 80 ~ 90 DEG C in existing production method of preheated airs and 70 ~ 80 DEG C of methanol boil-off gas
Body forms mixed gas, and mixed gas enters reactor after temperature rise heat exchanger heats up and reacted, and reaction gas is by drop
After warm heat exchanger cooling, the step of absorption into absorption tower, it is characterised in that the mixed gas is anti-in the reactor
The step of answering include:
1) reactor is composed in series by pre-reactor, first reactor and second reactor, and mixed gas successively passes through pre-reaction
Device, first reactor and second reactor；
2) control of pre-reactor temperature is in 140 ~ 150 DEG C, the control of first reactor temperature in 150 ~ 270 DEG C, second reactor temperature
Degree control is at 275 ~ 425 DEG C.
Based on the above technical solution, there is technical solution further below:
One filler with silk screen is set in the pre-reactor, can play the role of improving premixing efficiency.
Iron-molybdic catalyst is respectively arranged in first reactor and second reactor, the catalytic amount of second reactor is first anti-
1.5 ~ 2.5 times for answering device.
The absorption tower is composed in series by the first absorption tower, second absorption tower and third absorption tower；First absorption tower absorbs
Liquid repeats itself produces finished product formaldehyde, and second absorption tower absorbing liquid repeats itself extraction circulation fluid goes to the first absorption tower to absorb, the
Three absorption towers are absorbed using demineralized water, and absorbing liquid repeats itself extraction circulation fluid goes second absorption tower to absorb.
A kind of production method of formaldehyde provided by the present invention has the advantage that 1, using this method after, can directly produce
The formaldehyde (the concentration of formaldehyde content of production method production in the prior art is 37%) of 55% content, sour Jian Ce≤0.005%, first
Alcohol Han Liang≤0.5%；2, all iron-molybdic catalysts can be used；3, promotion system efficient low-consume is run, and improves productivity effect, is reduced
Production cost.
Detailed description of the invention:
Fig. 1 formaldehyde production process flow figure provided by the invention.
Specific implementation method:
Example one:
Air blower is opened, control air capacity is 150m3/ min is sent into fresh air, it is warming up to 80 after air preheater ~
90 DEG C, mixed gas is formed with the methanol steam from 70 ~ 80 DEG C of methanol evaporator, mixed gas is through temperature rise heat exchanger by temperature
It after being increased to 150 DEG C, is sufficiently mixed into pre-reactor and is warming up to 140 ~ 150 DEG C, added by control air velocity and methanol
Enter amount, controls oxygen concentration control of the methanol concentration between 5 ~ 8%, for the safe operation of device, with pre-reactor in pre-reactor
System is between 8.6 ~ 10.4%, it is ensured that 13% hereinafter, avoiding the formation of explosive mixture.After coming out from pre-reactor, into the
One reactor, first reactor reaction temperature are 250 DEG C, and the mixed gas after initial reaction enters second reactor, and second is anti-
The reaction temperature for answering device is 380 DEG C, and the generation gas after reaction enters absorption system, through the first absorption tower, 2,3 counter-current absorptions, from
First absorption tower generates finished product formaldehyde, through the content of formaldehyde 55.02% in testing cost formaldehyde, acid content 0.004%, methanol content
0.30%；The amount 700kg that catalyst is added in second reactor.
Example two:
Air blower is opened, control air capacity is 180m3/ min is sent into fresh air, is heated to 70 ~ 80 by air heater
DEG C, it is mixed with 70 ~ 80 DEG C of the methanol steam from methanol evaporator, after temperature is increased to 150 DEG C by Jing Huansheng warmer, into
Enter pre-reactor to be sufficiently mixed and be warming up to 140 ~ 150 DEG C, by control air velocity and methanol additional amount, control and reactor
Middle methanol concentration, for the safe operation of device, controls between 8.6 ~ 10.4% between 5 ~ 8% with the oxygen concentration of reactor,
Ensure 13% hereinafter, avoiding the formation of explosive mixture.From pre-reactor come out after, into first reactor, first reactor
Reaction temperature is 240 DEG C, and the mixed gas after initial reaction enters second reactor, and the reaction temperature of second reactor is 370
DEG C, the generation gas after reaction enters absorption system, arrives through the first absorption tower, 2,3 counter-current absorptions, generates finished product from the first absorption tower
Formaldehyde, through content of formaldehyde 54.84%, acid content 0.005%, the methanol content 0.28% in testing cost formaldehyde；
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form；It is any ripe
Know those skilled in the art, without departing from the scope of the technical proposal of the invention, all using the method for the disclosure above and
Technology contents make many possible changes and modifications to technical solution of the present invention, or are revised as the equivalence enforcement of equivalent variations
Example.Therefore, anything that does not depart from the technical scheme of the invention, it is made to the above embodiment according to the technical essence of the invention
Any simple modification, equivalent replacement, equivalence changes and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (4)
1. a kind of production method of formaldehyde, including the preheated air and methanol boil-off gas formation gaseous mixture in existing production method
Body, mixed gas enter reactor after temperature rise heat exchanger heats up and are reacted, and reaction gas cools down by cooling heat exchanger
Afterwards, the step of being absorbed into absorption tower, it is characterised in that the step of mixed gas is reacted in the reactor include:
1) reactor is composed in series by pre-reactor, first reactor and second reactor, and mixed gas successively passes through pre-reaction
Device, first reactor and second reactor；
2) control of pre-reactor temperature is in 140 ~ 150 DEG C, the control of first reactor temperature in 150 ~ 270 DEG C, second reactor temperature
Degree control is at 275 ~ 425 DEG C.
2. a kind of production method of formaldehyde according to claim 1, which is characterized in that a band is arranged in the pre-reactor
The filler of silk screen.
3. a kind of production method of formaldehyde according to claim 1 or claim 2, which is characterized in that first reactor and the second reaction
Iron-molybdic catalyst is respectively arranged in device, the catalytic amount of second reactor is 1.5 ~ 2.5 times of first reactor.
4. a kind of according to claim 1,2 production method of formaldehyde, which is characterized in that the absorption tower is absorbed by first
Tower, second absorption tower and third absorption tower are composed in series；First absorption tower absorbing liquid repeats itself, extraction finished product formaldehyde, second
Absorbing liquid repeats itself extraction circulation fluid in absorption tower goes to the first absorption tower to absorb, and third absorption tower is absorbed using demineralized water, is absorbed
Liquid repeats itself extraction circulation fluid goes second absorption tower to absorb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811504619.0A CN109574820B (en) | 2018-12-10 | 2018-12-10 | Production method of formaldehyde |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811504619.0A CN109574820B (en) | 2018-12-10 | 2018-12-10 | Production method of formaldehyde |
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| CN109574820A true CN109574820A (en) | 2019-04-05 |
| CN109574820B CN109574820B (en) | 2021-12-21 |
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| CN201811504619.0A Active CN109574820B (en) | 2018-12-10 | 2018-12-10 | Production method of formaldehyde |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110563903A (en) * | 2019-09-06 | 2019-12-13 | 无锡市华立石化工程有限公司 | preparation system and preparation process of urea formaldehyde pre-condensed liquid |
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| CN109574820B (en) | 2021-12-21 |
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