CN204275940U - A kind of novel methylene oxidation reaction apparatus - Google Patents
A kind of novel methylene oxidation reaction apparatus Download PDFInfo
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- CN204275940U CN204275940U CN201420486251.0U CN201420486251U CN204275940U CN 204275940 U CN204275940 U CN 204275940U CN 201420486251 U CN201420486251 U CN 201420486251U CN 204275940 U CN204275940 U CN 204275940U
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- Prior art keywords
- oxidation reaction
- gas
- heat exchange
- exchange area
- reaction region
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- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 43
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 title claims abstract description 10
- 239000003054 catalyst Substances 0.000 claims abstract description 21
- 238000009826 distribution Methods 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 68
- 239000007789 gas Substances 0.000 description 39
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 33
- 230000003647 oxidation Effects 0.000 description 19
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 238000007086 side reaction Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000006356 dehydrogenation reaction Methods 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical compound OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 206010020843 Hyperthermia Diseases 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229960004217 benzyl alcohol Drugs 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000004952 furnace firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036031 hyperthermia Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- -1 steam Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- Physical Or Chemical Processes And Apparatus (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses a kind of novel methylene oxidation reaction apparatus, comprise the cylindrical shell of closed at both ends, this cylindrical shell is divided into gas distribution regions, oxidation reaction region and heat exchange area from top to bottom successively, the cylinder lateral wall of described gas distribution regions is provided with gas feed, and inside is provided with gas distributor, this gas distributor is that frustoconical is horn-like, and major diameter openend and cylinder inboard wall are tightly connected, and described gas distribution regions is connected with oxidation reaction region by flange; Described oxidation reaction region is filled with catalyst layer; Described heat exchange area opposing gas flows to the vertical heat exchanger tube be provided with for the heat transferring medium that circulates, and oxidation reaction region is communicated with the shell side of heat exchange area; The bottom of described cylindrical shell is also provided with gas vent.The shortcomings such as it is short that the utility model solves existing oxidator normal service life, and catalyst change frequency is high, overcome and are limited to high-temperature material and select current oxidator full-scale plant to invest large problem.
Description
Technical field
The utility model belongs to chemical production technology and equipment technical field, relates generally to the oxidation reactor for Formaldehyde Production.
Background technology
Existing Formaldehyde Production take refined methanol as raw material, adopts stone silver method production technology.The refined methanol of 98% evaporates in methanol evaporator, then mixes with a certain proportion of air, and adds batching steam, is heated to 100 DEG C ~ 130 DEG C, then enters formaldehyde oxidation reactor through heater after filter, spark arrester.In reactor, methyl alcohol, air, steam ternary gas by after electric furnace firing up, under silver catalyst effect, oxidation occurs methyl alcohol and dehydrogenation reaction generates high temperature formaldehyde gas, again high temperature formaldehyde gas is cooled to less than 100 DEG C, absorbs through absorption tower, obtain formalin.
Oxidation of formaldehyde device is the nucleus equipment that silver-colored method produces formaldehyde, in oxidation of formaldehyde device, there is dehydrogenation oxidation and react thus produce formaldehyde in material benzenemethanol and air, therefore must must shift out amount of heat rapidly through beds fast at reactor because side reaction under hot conditions is more under the effect of silver catalyst.The function of oxidation of formaldehyde device provides catalytic space for raw material, and shifts out the device of heat of reaction fast.Oxidation of formaldehyde device is the production cost of the consumption directly having influence on raw material, formaldehyde, have impact on the economic benefit of Formaldehyde Production, is the core life place in formaldehyde production device.
The methanol oxidation device of current use is syllogic oxidation reactor, namely be made up of following three parts, epimere is oxidation panel, methanol oxidation release heat is there is entering in methyl alcohol, air, steam three-element mixed gas body by during the catalyst layer of electric furnace igniting heating, and then there is methanol dehydrogenation reaction, generate formaldehyde gas; Stage casing is waste heat recovery section, and reclaim the high temperature formaldehyde gas come from oxidation panel and walk tube side, water and steam walks shell side, utilizes high temperature heat to produce low-pressure steam; Hypomere is gas cooling section, and the formaldehyde gas come from waste heat recovery section walks tube side, and cooling water walks shell side, after reverse heat-exchange, formaldehyde is cooled to less than 100 DEG C.
The shortcoming of the formaldehyde oxidation reactor of this three stage structure: condition of work worsens, make waste heat recovery section high temperature side position tube sheet, the junction of tube sheet and heat exchanger tube is under high temperature (600 DEG C ~ 660 DEG C), pressure should be born, be subject to high temperature, the impact of high-speed gas and abrasion again, tube-to-sheet joint place very easily damages, in addition austenitic stainless steel significantly declines higher than the intensity of material when 525 DEG C, plasticity and non-oxidizability in serviceability temperature, cause breakage to repair, cause service life of equipment very short.
For a long time, when oxidation of formaldehyde device runs at the temperature of 620-660 DEG C, the welding point place of upper perforated plate tubulation is corroded and occurs crackle, and repair welding effect is also bad, and service life only has 1-2, and the equipment of a set of like this hundreds of thousands unit has just been scrapped.Therefore solve the etching problem of oxidation of formaldehyde device waste heat boiler, increase the service life, become the problem that China's formaldehyde industry is anxious to be resolved.
Summary of the invention
Goal of the invention: for above-mentioned Problems existing and defect, the utility model provides novel methylene oxidation reaction apparatus, solve existing oxidator normal service life short, the shortcomings such as catalyst change frequency is high, and overcome due to heat transfer efficiency impact and be limited to high-temperature material and select current oxidator full-scale plant to invest large problem.
Technical scheme: for achieving the above object, the utility model is by the following technical solutions: a kind of novel methylene oxidation reaction apparatus, comprise the cylindrical shell of closed at both ends, this cylindrical shell is divided into gas distribution regions, oxidation reaction region and heat exchange area from top to bottom successively, the cylinder lateral wall of described gas distribution regions is provided with gas feed, and inside is provided with gas distributor, this gas distributor is that frustoconical is horn-like, and major diameter openend and cylinder inboard wall are tightly connected, described gas distribution regions is connected with oxidation reaction region by flange; Described oxidation reaction region is filled with catalyst layer; Described heat exchange area opposing gas flows to the vertical heat exchanger tube be provided with for the heat transferring medium that circulates, and oxidation reaction region is communicated with the shell side of heat exchange area; The bottom of described cylindrical shell is also provided with gas vent.
Further improvement, described heat exchange area is three stage structure.
Further improvement, the outer wall of described gas distribution regions is provided with the outer adjoining pipe of circulation thermal source.
Further, described catalyst layer is square structure, and is mated formation on heat exchanger tube by bracing frame.
Further, described heat exchanger tube is provided with the outer fin of copper or nickel material.
Beneficial effect: compared with prior art, the utility model has the following advantages:.
Accompanying drawing explanation
Fig. 1 is the structural representation of oxidation reaction apparatus described in the utility model.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, illustrate the utility model further, these embodiments should be understood and be only not used in restriction scope of the present utility model for illustration of the utility model, after having read the utility model, the amendment of those skilled in the art to the various equivalent form of value of the present utility model has all fallen within the application's claims limited range.
As shown in Figure 1, a kind of oxidation of formaldehyde reaction unit, be divided into gas distribution regions, oxidation reaction region and heat exchange area from top to bottom, the cylinder body outer wall of gas distribution regions arranges gas feed, inside arranges gas distributor, this gas distributor is that taper type is horn-like, and big opening end and barrel soldering; Be equipped with outer adjoining pipe at cylindrical shell top and vertical tube part simultaneously.Described heat exchange area is provided with the heat exchanger tube vertical with airflow direction, the water of circulation for cooling in this heat exchanger tube.
Methanol feedstock gas, steam, formaldehyde plant tail gas, air enter catalyst layer by horn-like gas distributor enter backward upper flowing by gas feed after preceding processes mixing completely after.Unstripped gas enters oxidator catalyst layer after distribution of gas district is incubated and is evenly distributed, and after catalyst fast response, produces large calorimetric.In gas distribution regions, there is efficient gas distribution facilities, make unstripped gas physical efficiency evenly by catalytic layer, avoiding distribution of gas inequality causes part catalyst to lose efficacy very soon, thus affect reaction and add consumption of raw materials, gas distribution regions internal upper part adopts outer adjoining pipe, condensation after preventing unstrpped gas from contacting with device wall, and this distribution of gas district gas-condensate liquid is recycled to off-side by gas distributor lime set, avoid lime set and drop to catalyst layer, cause caking to affect catalytic efficiency.The setting of oxidator hanger and oxidation unit flange is mainly after catalyst layer inactivation, is convenient to change catalyst layer and arranges.
Gas redistributor prevents there is gas short circuit in device corner areas, thus cause the localized hyperthermia that heat exchange inequality causes, thus promote the generation of side reaction further, reduce the acid content due to side reaction in consumption of raw materials and product, alcohol content is higher waits series of problems.Catalyst layer considers apparatus fringe region catalyst filling difficulty, thus the problem such as cause the uneven side reaction caused of catalyst layer tile work higher, have changed filling mode and the filling of corner catalyst layer, effectively prevent above problem.
Three sections of heat exchange area sections are high-temperature quenching district, in this region, formolite reaction gas is directly by reaction temperature 600 ~ 660 DEG C, directly be down to less than 450 DEG C, mat formation in order to oxidator and promote methanol oxidation dehydrogenation reaction further and suppress side reaction thus cut down the consumption of raw materials in this region, this region heat-exchange tube can adopt the material such as copper, nickel as outer fin.
Claims (5)
1. a novel methylene oxidation reaction apparatus, it is characterized in that: the cylindrical shell comprising closed at both ends, this cylindrical shell is divided into gas distribution regions, oxidation reaction region and heat exchange area from top to bottom successively, the cylinder lateral wall of described gas distribution regions is provided with gas feed, and inside is provided with gas distributor, this gas distributor is that frustoconical is horn-like, and major diameter openend and cylinder inboard wall are tightly connected, and described gas distribution regions is connected with oxidation reaction region by flange; Described oxidation reaction region is filled with catalyst layer; Described heat exchange area opposing gas flows to the vertical heat exchanger tube be provided with for the heat transferring medium that circulates, and oxidation reaction region is communicated with the shell side of heat exchange area; The bottom of described cylindrical shell is also provided with gas vent.
2. novel methylene oxidation reaction apparatus according to claim 1, is characterized in that: described heat exchange area is three stage structure.
3. novel methylene oxidation reaction apparatus according to claim 1, is characterized in that: the outer wall of described gas distribution regions is provided with the outer adjoining pipe of circulation thermal source.
4. novel methylene oxidation reaction apparatus according to claim 1, is characterized in that: described catalyst layer is square structure, and is mated formation on heat exchanger tube by bracing frame.
5. novel methylene oxidation reaction apparatus according to claim 1, is characterized in that: described heat exchanger tube is provided with the outer fin of copper or nickel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420486251.0U CN204275940U (en) | 2014-08-27 | 2014-08-27 | A kind of novel methylene oxidation reaction apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420486251.0U CN204275940U (en) | 2014-08-27 | 2014-08-27 | A kind of novel methylene oxidation reaction apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204275940U true CN204275940U (en) | 2015-04-22 |
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ID=52859140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420486251.0U Expired - Lifetime CN204275940U (en) | 2014-08-27 | 2014-08-27 | A kind of novel methylene oxidation reaction apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204275940U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190327A (en) * | 2014-08-27 | 2014-12-10 | 江苏凯茂石化科技有限公司 | Novel formaldehyde oxidation reaction device |
| CN106123642A (en) * | 2016-08-19 | 2016-11-16 | 无锡市华立石化工程有限公司 | The heat-exchange system of the novel oxidator of methanol without tube sheet |
| CN115364773A (en) * | 2022-07-28 | 2022-11-22 | 任中哲 | Building formaldehyde oxidation reactor |
-
2014
- 2014-08-27 CN CN201420486251.0U patent/CN204275940U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190327A (en) * | 2014-08-27 | 2014-12-10 | 江苏凯茂石化科技有限公司 | Novel formaldehyde oxidation reaction device |
| CN106123642A (en) * | 2016-08-19 | 2016-11-16 | 无锡市华立石化工程有限公司 | The heat-exchange system of the novel oxidator of methanol without tube sheet |
| CN115364773A (en) * | 2022-07-28 | 2022-11-22 | 任中哲 | Building formaldehyde oxidation reactor |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20150422 |