CN105418390A - Energy-saving type continuous and circular production technology method for formaldehyde - Google Patents

Energy-saving type continuous and circular production technology method for formaldehyde Download PDF

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Publication number
CN105418390A
CN105418390A CN201510789815.7A CN201510789815A CN105418390A CN 105418390 A CN105418390 A CN 105418390A CN 201510789815 A CN201510789815 A CN 201510789815A CN 105418390 A CN105418390 A CN 105418390A
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China
Prior art keywords
methanol
energy
formaldehyde
evaporator
mixed
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CN201510789815.7A
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Chinese (zh)
Inventor
郭吕景
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Yangzhou Zhongxin Chemical Co Ltd
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Yangzhou Zhongxin Chemical Co Ltd
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Priority to CN201510789815.7A priority Critical patent/CN105418390A/en
Publication of CN105418390A publication Critical patent/CN105418390A/en
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/27Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
    • C07C45/32Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
    • C07C45/37Preparation 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
    • C07C45/38Preparation 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
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency

Abstract

The invention discloses an energy-saving type continuous and circular circulation production technology method for formaldehyde. Firstly, raw material methanol is sprayed upwards in an atomizing mode to go out and penetrate a heat exchange segment of a methanol evaporator to be heated, filtered air enters the methanol evaporator through stored methanol liquid which flows back from the tower bottom of the methanol evaporator so that bubbling can be performed, and therefore part of methanol and atomized methanol can be carried to rise together and are heated in the heat exchange segment to rise and be mixed, and binary gas of methanol-air can be formed; secondly, the binary gas then enters a mixer and is mixed with vapor so that ternary gas can be formed, then the ternary gas passes a superheater, passes a fire barrier and is conveyed into a peroxidization device, and a dehydrogenation oxidation reaction happens. According to the method, methanol is sprayed upwards in the atomizing mode, methanol and air are heated in the heat exchange segment to rise and be mixed through negative pressure, the evaporating efficiency of methanol is greatly improved, evaporation energy consumption is reduced, meanwhile methanol is gasified to the maximum extent, it is avoided that too many liquid methanol liquid beads enter an oxidization device, finally the purposes of energy conservation, emission reduction and conversion rate increase are achieved.

Description

A kind of energy-saving formaldehyde continuous circulation producing and manufacturing technique
Technical field
The invention belongs to technical field of chemistry and chemical engineering, particularly relate to formaldehyde production technology method.
Background technology
Formaldehyde is one of important Organic Chemicals, of many uses.At present, silver-colored formaldehyde is produced and is mainly divided into two unit operations, and namely oxidizing reaction unit, absorptive unit, oxidizing reaction unit are completed by four devices respectively, i.e. methyl alcohol evaporation, three vigour heating, three vigour are filtered, and oxidizer reacts.Methyl alcohol evaporates as the relatively large energy-dissipating device of formaldehyde plant, at present primarily of two kinds of evaporation modes, the first utilizes steam directly as the thermal source that methyl alcohol evaporates for climbing-film evaporator, methyl alcohol vaporization temperature controls at 60 ~ 80 DEG C, mainly steam energy consuming ratio is larger for this evaporation mode, current domestic new device does not adopt this evaporation mode substantially, the second evaporation mode is air bubbling evaporation in methanol solution, and utilize the shell and tube heat exchanger heat exchange of outside plate-type heat exchanger or inner larger area to evaporate, it is 40 ~ 50 DEG C that this vaporization temperature controls vaporization temperature, the absorption of silver-colored formaldehyde absorptive unit can be effectively utilized to need the heat shifted out, thus both saved the recirculated water that steam again saves absorptive unit, but this device air blower needs the Pressure Drop overcoming bubble liquid level height, therefore blower fan power consumption is larger, and the mode of indirect heating needs a large amount of methanol loop, require the recycle pump of relatively high power.In formaldehyde normal productive process, the reaction heat being produced into formaldehyde due to methanol oxidation in Formaldehyde Production except meet dehydrogenation reaction institute's heat requirement and unstripped gas heat up and still have except thermosteresis unnecessary.For maintaining temperature of reaction at 600 ~ 680 DEG C, generally enter a certain amount of water vapour to absorb and to remove unnecessary reaction heat at material benzenemethanol and air reprovision, this water vapour allocated into is referred to as steam of preparing burden.In order to keep and safeguard that temperature of reaction general control needs to add batching steam in formaldehyde production, and the batching steam added, do not participate in reaction and heat exchange, substantially directly discharged in the absorption of formaldehyde absorption unit or tail gas, and this two-part heat is not all effectively utilized, be substantially all wasted.In Formaldehyde Production, do not add or reduce add batching steam amount can maintain stablize temperature of reaction stablize, so greatly will save steam consumption quantity, thus raising Formaldehyde Production in steam production.
Summary of the invention
Goal of the invention: for above-mentioned existing Problems existing and deficiency, the object of this invention is to provide a kind of energy-saving formaldehyde continuous circulation producing and manufacturing technique, methyl alcohol vaporization efficiency is high, has the conversion rate of oxidation of more less energy-consumption and Geng Gao.
Technical scheme: for achieving the above object, the present invention by the following technical solutions: a kind of energy-saving formaldehyde continuous circulation producing and manufacturing technique, comprises the following steps:
(1) material benzenemethanol is delivered to methanol evaporator by gauger through methanol pump, and sprayed upwards by atomizing type and go out and pass methanol evaporator heat exchanging segment to heat, meanwhile, the methanol solution stored from the backflow of methanol evaporator tower bottom through filtered air enters and carries out bubbling, thus carry part methyl alcohol and jointly rise with atomization methyl alcohol, and be heated to rise at heat exchanging segment and be mixed to form two vigour of methanol-air; In this process, tower internal pressure is-50 ~ 80KPa, and it is 30 ~ 60 DEG C that air enters temperature; (methyl alcohol atomization upwards, at utmost can form gasification, avoid excessive liquid pearl, thus can improve formaldehyde conversion)
(2) two vigour enter in mixing tank again, are mixed to form three vigour with water vapour, are then warming up to 120 ~ 130 DEG C through superheater, and by sending in oxidizer after spark arrester, with under silver-colored method katalysis, at 660 ~ 680 DEG C, dehydrogenation oxidation reaction occur;
(3) reaction gas is down to less than 200 DEG C through over-quenching, then is cooled to 70 ~ 80 DEG C, sends into absorption tower absorption and obtains formaldehyde solution.
As preferably, the air entered bottom methanol evaporator is also mixed with the tail gas behind absorption tower.
As preferably, described methanol evaporator heat exchanging segment is pipe shell type heat exchange section, and the thermal source of employing is the tail gas of formaldehyde absorbing tower.
As preferably, the thermal source of described superheater is the reaction gas that oxidizer is discharged.
As preferably, the methanol solution stored that refluxes bottom described methanol evaporator sends into atomizing spray by liquid pump circulation.
Beneficial effect: compared with prior art, the present invention utilizes atomizing type upward spraying methyl alcohol, and to be heated at heat exchanging segment with air and to mix by rising under negative pressure, substantially increase the vaporization efficiency of methyl alcohol and reduce evaporation energy consumption, at utmost gasification of methanol avoids too much liquid methanol liquid pearl to enter oxidizer simultaneously, finally reach energy-saving and emission-reduction, heighten the object of transformation efficiency.
Embodiment
Below in conjunction with specific embodiment, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Formaldehyde continuous circulation producing and manufacturing technique of the present invention, comprises the following steps:
(1) material benzenemethanol is delivered to methanol evaporator by gauger through methanol pump, and sprayed upwards by atomizing type and go out and pass methanol evaporator heat exchanging segment to heat, meanwhile, the methanol solution stored from the backflow of methanol evaporator tower bottom through filtered air enters and carries out bubbling, thus carry part methyl alcohol and jointly rise with atomization methyl alcohol, and be heated to rise at heat exchanging segment and be mixed to form two vigour of methanol-air; In this process, tower internal pressure is-50 ~ 80KPa, and it is 30 ~ 60 DEG C that air enters temperature; (methyl alcohol atomization upwards, at utmost can form gasification, avoid excessive liquid pearl, thus can improve formaldehyde conversion)
(2) two vigour enter in mixing tank again, are mixed to form three vigour with water vapour, are then warming up to 120 ~ 130 DEG C through superheater, and by sending in oxidizer after spark arrester, with under silver-colored method katalysis, at 660 ~ 680 DEG C, dehydrogenation oxidation reaction occur;
(3) reaction gas is down to less than 200 DEG C through over-quenching, then is cooled to 70 ~ 80 DEG C, sends into absorption tower absorption and obtains formaldehyde solution.
As preferably, the air entered bottom methanol evaporator is also mixed with the tail gas behind absorption tower.
As preferably, described methanol evaporator heat exchanging segment is pipe shell type heat exchange section, and the thermal source of employing is the tail gas of formaldehyde absorbing tower.
As preferably, the thermal source of described superheater is the reaction gas that oxidizer is discharged.
As preferably, the methanol solution stored that refluxes bottom described methanol evaporator sends into atomizing spray by liquid pump circulation.

Claims (5)

1. an energy-saving formaldehyde continuous circulation producing and manufacturing technique, is characterized in that, comprise the following steps:
(1) material benzenemethanol is delivered to methanol evaporator by gauger through methanol pump, and sprayed upwards by atomizing type and go out and pass methanol evaporator heat exchanging segment to heat, meanwhile, the methanol solution stored from the backflow of methanol evaporator tower bottom through filtered air enters and carries out bubbling, thus carry part methyl alcohol and jointly rise with atomization methyl alcohol, and be heated to rise at heat exchanging segment and be mixed to form two vigour of methanol-air; In this process, tower internal pressure is-50 ~ 80KPa, and it is 30 ~ 60 DEG C that air enters temperature;
(2) two vigour enter in mixing tank again, are mixed to form three vigour with water vapour, are then warming up to 120 ~ 130 DEG C through superheater, and by sending in oxidizer after spark arrester, with under silver-colored method katalysis, at 660 ~ 680 DEG C, dehydrogenation oxidation reaction occur;
(3) reaction gas is down to less than 200 DEG C through over-quenching, then is cooled to 70 ~ 80 DEG C, sends into absorption tower absorption and obtains formaldehyde solution.
2. energy-saving formaldehyde continuous circulation producing and manufacturing technique according to claim 1, is characterized in that: the air entered bottom methanol evaporator is also mixed with the tail gas behind absorption tower.
3. energy-saving formaldehyde continuous circulation producing and manufacturing technique according to claim 1, it is characterized in that: described methanol evaporator heat exchanging segment is pipe shell type heat exchange section, the thermal source of employing is the tail gas of formaldehyde absorbing tower.
4. energy-saving formaldehyde continuous circulation producing and manufacturing technique according to claim 1, is characterized in that: the thermal source of described superheater is the reaction gas that oxidizer is discharged.
5. energy-saving formaldehyde continuous circulation producing and manufacturing technique according to claim 1, is characterized in that: the methanol solution stored that refluxes bottom described methanol evaporator sends into atomizing spray by liquid pump circulation.
CN201510789815.7A 2015-11-17 2015-11-17 Energy-saving type continuous and circular production technology method for formaldehyde Pending CN105418390A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510789815.7A CN105418390A (en) 2015-11-17 2015-11-17 Energy-saving type continuous and circular production technology method for formaldehyde

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510789815.7A CN105418390A (en) 2015-11-17 2015-11-17 Energy-saving type continuous and circular production technology method for formaldehyde

Publications (1)

Publication Number Publication Date
CN105418390A true CN105418390A (en) 2016-03-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112521251A (en) * 2021-01-12 2021-03-19 沾化瑜凯新材料科技有限公司 Method for producing high-purity hydrogenated neopentyl glycol by using methanol and isobutyraldehyde

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112521251A (en) * 2021-01-12 2021-03-19 沾化瑜凯新材料科技有限公司 Method for producing high-purity hydrogenated neopentyl glycol by using methanol and isobutyraldehyde

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Application publication date: 20160323