CN105418389A - Efficient formaldehyde production process method - Google Patents
Efficient formaldehyde production process method Download PDFInfo
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- CN105418389A CN105418389A CN201510788352.2A CN201510788352A CN105418389A CN 105418389 A CN105418389 A CN 105418389A CN 201510788352 A CN201510788352 A CN 201510788352A CN 105418389 A CN105418389 A CN 105418389A
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- Prior art keywords
- methanol
- methyl alcohol
- formaldehyde
- manufacturing technique
- absorption tower
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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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- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses an efficient formaldehyde production process method. The method comprises the steps that 1, a methyl alcohol water solution is adopted as a raw material and is sprayed out upwards in an atomizing mode, heating and gasifying are carried out, filtered air is subjected to bubbling at the same time, therefore, part of methyl alcohol and water are carried and ascend along with the atomized methyl alcohol solution under the action of negative pressure suction force, and heating and mixing are carried out on a heat exchange section; 2, ternary gas is subjected to a dehydrogenation and oxidization reaction, and enters an absorption tower. Methyl alcohol is sprayed upwards in the atomized mode, methyl alcohol and air are heated on the heat exchange section, ascend and are mixed under negative pressure, the evaporation efficiency of methyl alcohol is greatly improved, and evaporation energy consumption is reduced. Meanwhile, methyl alcohol is gasified to the maximum degree, it is avoided that too much liquid methyl alcohol balls enter an oxygenizer, and finally the aims of saving energy, reducing emissions and increasing the conversion rate are achieved.
Description
Technical field
The invention belongs to technical field of chemistry and chemical engineering, particularly relate to methanal preparing technique.
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 efficient formaldehyde producing and manufacturing technique, formaldehyde turnover ratio is high, and energy consumption is low.
Technical scheme: for achieving the above object, the present invention is by the following technical solutions: a kind of efficient formaldehyde producing and manufacturing technique, comprise the following steps: (1) take methanol aqueous solution as raw material, methanol evaporator is delivered to by transferpump via after gauger, and go out and pass methanol evaporator heat exchanging segment to carry out heating and gasifying by atomizing type upward spraying, meanwhile, the methanol solution stored from the backflow of methanol evaporator tower bottom through filtered air enters and carries out bubbling, thus carry part first alcohol and water, and under the effect of negative-pressure sucking, rise together with atomization methanol solution, and three vigour mixing and once form methanol-air-water vapour of being heated at heat exchanging segment, in this process, tower internal pressure is-20 ~ 60KPa, and it is 30 ~ 60 DEG C that air enters temperature, and the temperature of methanol evaporator heat exchanging segment is 40 ~ 60 DEG C, (2) three vigour are 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, be cooled to 70 ~ 80 DEG C again, and send into bottom absorption tower, after reaction gas enters absorption tower absorption tower packing section with under spray and under low concentration formaldehyde solution carry out mass-and heat-transfer absorption, divide multistage carrying out in this process, every grade is successively decreased gradually for the formaldehyde solution concentration sprayed from bottom to up.
As preferably, described absorption tower comprises multistage absorption section from bottom to up, and adopts the external mode of knapsack, and is provided with vapor riser between adjacent absorbent section.
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.
As preferably, the air entered bottom methanol evaporator is also mixed with the tail gas behind absorption tower.
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.
Efficient formaldehyde producing and manufacturing technique of the present invention, comprise the following steps: (1) take methanol aqueous solution as raw material, methanol evaporator is delivered to by transferpump via after gauger, and go out and pass methanol evaporator heat exchanging segment to carry out heating and gasifying by atomizing type upward spraying, meanwhile, the methanol solution stored from the backflow of methanol evaporator tower bottom through filtered air enters and carries out bubbling, thus carry part first alcohol and water, and under the effect of negative-pressure sucking, rise together with atomization methanol solution, and three vigour mixing and once form methanol-air-water vapour of being heated at heat exchanging segment, in this process, tower internal pressure is-20 ~ 60KPa, and it is 30 ~ 60 DEG C that air enters temperature, and the temperature of methanol evaporator heat exchanging segment is 40 ~ 60 DEG C, (2) three vigour are 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, be cooled to 70 ~ 80 DEG C again, and send into bottom absorption tower, after reaction gas enters absorption tower absorption tower packing section with under spray and under low concentration formaldehyde solution carry out mass-and heat-transfer absorption, divide multistage carrying out in this process, every grade is successively decreased gradually for the formaldehyde solution concentration sprayed from bottom to up.
As preferably, described absorption tower comprises multistage absorption section from bottom to up, and adopts the external mode of knapsack, and is provided with vapor riser between adjacent absorbent section.
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.
As preferably, the air entered bottom methanol evaporator is also mixed with the tail gas behind absorption tower.
Claims (6)
1. an efficient formaldehyde producing and manufacturing technique, is characterized in that, comprises the following steps:
(1) take methanol aqueous solution as raw material, methanol evaporator is delivered to by transferpump via after gauger, and go out and pass methanol evaporator heat exchanging segment to carry out heating and gasifying by atomizing type upward spraying, meanwhile, the methanol solution stored from the backflow of methanol evaporator tower bottom through filtered air enters and carries out bubbling, thus carry part first alcohol and water, and under the effect of negative-pressure sucking, rise together with atomization methanol solution, and three vigour mixing and once form methanol-air-water vapour of being heated at heat exchanging segment; In this process, tower internal pressure is-20 ~ 60KPa, and it is 30 ~ 60 DEG C that air enters temperature, and the temperature of methanol evaporator heat exchanging segment is 40 ~ 60 DEG C;
(2) three vigour are 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, be cooled to 70 ~ 80 DEG C again, and send into bottom absorption tower, after reaction gas enters absorption tower absorption tower packing section with under spray and under low concentration formaldehyde solution carry out mass-and heat-transfer absorption, divide multistage carrying out in this process, every grade is successively decreased gradually for the formaldehyde solution concentration sprayed from bottom to up.
2. efficient formaldehyde producing and manufacturing technique according to claim 1, is characterized in that: described absorption tower comprises multistage absorption section from bottom to up, and adopts the external mode of knapsack, and be provided with vapor riser between adjacent absorbent section.
3. efficient formaldehyde 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. efficient formaldehyde 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. efficient formaldehyde 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.
6. efficient formaldehyde 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510788352.2A CN105418389A (en) | 2015-11-17 | 2015-11-17 | Efficient formaldehyde production process method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510788352.2A CN105418389A (en) | 2015-11-17 | 2015-11-17 | Efficient formaldehyde production process method |
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| Publication Number | Publication Date |
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| CN105418389A true CN105418389A (en) | 2016-03-23 |
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| CN201510788352.2A Pending CN105418389A (en) | 2015-11-17 | 2015-11-17 | Efficient formaldehyde production process method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105732342A (en) * | 2016-03-25 | 2016-07-06 | 湖北三江化工有限责任公司 | Formaldehyde production method based on exhaust gas circulating process |
-
2015
- 2015-11-17 CN CN201510788352.2A patent/CN105418389A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105732342A (en) * | 2016-03-25 | 2016-07-06 | 湖北三江化工有限责任公司 | Formaldehyde production method based on exhaust gas circulating process |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160323 |
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| WD01 | Invention patent application deemed withdrawn after publication |