CN203002339U - Novel vinyl-acetate reactor - Google Patents
Novel vinyl-acetate reactor Download PDFInfo
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- CN203002339U CN203002339U CN 201220697088 CN201220697088U CN203002339U CN 203002339 U CN203002339 U CN 203002339U CN 201220697088 CN201220697088 CN 201220697088 CN 201220697088 U CN201220697088 U CN 201220697088U CN 203002339 U CN203002339 U CN 203002339U
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Abstract
The utility model relates to a novel vinyl-acetate reactor. The novel vinyl-acetate reactor comprises a shell, a reaction tube array, a heat-carrier outlet set and a heat-carrier lower inlet set; the reaction tube array is arranged in the shell; the heat-carrier outlet set is arranged on the top end of the shell; the heat-carrier lower inlet set is arranged on the bottom end of the shell; the top of the shell is provided with an upper end enclosure; the top of the upper end enclosure is provided with a gas distributor; the gas distributor is connected with a gas inlet; and at least one heat-carrier lower inlet set is additionally arranged between the heat-carrier outlet set and the heat-carrier lower inlet set. Compared with the prior art, the novel vinyl-acetate reactor provided by the utility model has the advantages that the heat transfer capacity is improved, the axial temperature difference and the radial temperature difference are small, the hot spot temperature can be decreased under the premise of ensuring the single tube conversion rate and the selectivity, the selectivity and the productivity of the vinyl acetate can be improved, and the service life of a catalyst can be prolonged.
Description
Technical field
The utility model relates to a kind of novel fixed bed reactors of synthesizing vinyl acetate, and this reactor not only can be for the synthesis of vinyl acetate, but also can be applied in the middle of other heat releases or the endothermic reaction that need to use fixed bed.
Background technology
The catalyst of producing vinyl acetate by acetylene method is the active carbon of load zinc acetate, raw material is acetylene and acetic acid, reaction temperature is controlled at 160-220 ℃, reaction pressure 0.02-0.04MPaG, the acetic acid conversion ratio is at 30-80%, and unreacted acetylene recycles after removing impurity through cooling, washing, separation.This reaction is exothermic reaction, and from the reactor content import, temperature begins to raise, and reaction speed is accelerated, and emitting heat of reaction also increases, and axially the high-temperature region can occur in the reaction tube beds, and the reaction liberated heat is taken away by tail gas and heat carrier.Therefore having a maximum temperature in a certain position of beds is focus.Hot(test)-spot temperature is too high, reduces the selective of vinyl acetate with increasing accessory substance, and side reaction increases, and the objectionable impurities such as acetone in reactant liquor, crotonaldehyde, divinylacetylene are increased, and affects product quality; Simultaneously, can cause carbon distribution on catalyst, zinc acetate clinkering and distillation, cause catalyst activity reduction, life-span to reduce.A vital link so strictly control hot(test)-spot temperature.And if axial temperature difference or radial temperature difference are larger, in order to reach the design production capacity often promoting hot(test)-spot temperature as means, with sacrifice selective and catalyst life as cost, so reduce axial and radial temperature difference is also very important.Existing producing vinyl acetate by acetylene method reactor often just exists axially or the larger shortcoming of radial temperature difference.
Summary of the invention
The purpose of this utility model is exactly to provide a kind of axial and radial temperature difference of producing vinyl acetate by acetylene method fixed bed reactors, Novel acetate ethylene reaction device of raising production capacity of dwindling for the defective that overcomes above-mentioned prior art existence.
The purpose of this utility model can be achieved through the following technical solutions: a kind of Novel acetate ethylene reaction device, comprise housing, be positioned at the reaction tube of housing, be positioned at the heating medium outlet group on housing top and be positioned at housing bottom heat carrier lower inlet group, case top is provided with upper cover, this upper cover top is provided with gas distributor, this gas distributor connects the gas access, it is characterized in that, sets up at least one group of heat carrier import group between described heating medium outlet group and heat carrier lower inlet group.The import group number of setting up in theory is more, and axial temperature difference is less, but actual design import group should be weighed the facility of equipment cost and processing, maintenance, cleaning, operation when counting, and the degree of after increasing, axial temperature difference being dwindled.
Set up two groups of heat carrier import groups between described heating medium outlet group and heat carrier lower inlet group, be respectively: lower inlet group in upper inlet group and heat carrier in heat carrier.Selectively according to hotspot location and axial temperature difference in actual use use wherein one group or two groups to come into operation, temperature is controlled easily and fast, effectively.Can reach the purpose that reduces to greatest extent axial temperature difference.Simultaneously, established basis preferably for enlarging single stove production capacity.
So-calledly selectively use heat carrier import group according to hotspot location, because in the device running, decline gradually due to catalyst activity, hotspot location also moves down thereupon gradually, and one group of choice for use or two groups of heat carrier imports should be with near hotspot location and be in below hotspot location as selecting foundation.
So-calledly selectively use heat carrier import group according to axial temperature difference, namely can select wherein two groups to use simultaneously when axial temperature difference is larger, axial temperature difference hour can only be selected wherein one group of use.
The heat carrier import group of setting up between described heating medium outlet group and heat carrier lower inlet group has many groups, selective wherein a group or the many groups of use simultaneously used.
Described heating medium outlet group, heat carrier lower inlet group and the number of openings of respectively organizing every group of heat carrier import group of setting up at least one.
The described heat carrier import group of respectively organizing is provided with a plurality of openings, selectively uses one of them opening or uses simultaneously a plurality of openings.The umber of feed inlet that arranges of each group is more in theory, and radial temperature difference is less, but the actual design opening number should be weighed the facility of equipment cost and processing, maintenance, cleaning, operation when counting, and the degree of after increasing, the temperature difference radially being dwindled.
That sets up respectively organizes between heat carrier, and and heating medium outlet group, heat carrier lower inlet group between axially equidistantly distribute.
That sets up respectively organizes between heat carrier, and with the opening of heating medium outlet group, heat carrier lower inlet group being distributed as overlapping distribution or being interspersed diametrically.
The quantity of described reaction tube is the 5000-7500 root.
Be provided with upper perforated plate between described housing and upper cover, described heating medium outlet group, respectively organize heat carrier import group and be equipped with each other distribution grid.
By technique scheme, the utility model has been realized following purpose:
One of the purpose of this utility model is to dwindle the axial temperature difference of producing vinyl acetate by acetylene method fixed bed reactors, improves the life-span of the selective and extending catalyst of vinyl acetate.
Two of the purpose of this utility model is to dwindle the radial temperature difference of producing vinyl acetate by acetylene method fixed bed reactors, improves the life-span of the selective and extending catalyst of vinyl acetate.
Three of the purpose of this utility model is the production capacity that increases the separate unit reactor, reduces the equipment cost of unit production capacity.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment 1;
Fig. 2 is that the utility model middle heat carrier import group number is two groups, and the top view when adopting diametrically overlapping distribute;
Fig. 3 is that the utility model middle heat carrier import group number is two groups, and adopts the top view when being interspersed diametrically.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
Embodiment 1:
as shown in Figure 1, Novel acetate ethylene reaction device is by gas access 1, gas distributor 2, upper cover 3, (this heating medium outlet group is provided with two openings to heating medium outlet group 4: opening 4A, opening 4B), on heat carrier, distribution grid 5, (in this heat carrier, the upper inlet group is provided with two openings to upper inlet group 6 in heat carrier: opening 6A, opening 6B), (in this heat carrier, the lower inlet group is provided with two openings to lower inlet group 7 in heat carrier: opening 7A, opening 7B), under heat carrier, distribution grid 8, (this heat carrier lower inlet group is provided with two openings to heat carrier lower inlet group 9: opening 9A, opening 9B), give vent to anger and export 10, reaction tube 11, housing 12, lower perforated plate 13, in heat carrier, distribution grid 14, upper perforated plate 15, flange 16.Reaction tube 11 is arranged in housing 12, and housing 12 tops connect upper covers 3 by flange 16, between upper cover 3 and housing 12, upper perforated plate 15 are set, and upper cover 3 tops are provided with gas distributor 2, gas distributor 2 connection gas accesses 1.Heating medium outlet group 4 is arranged on housing 12 tops, heat carrier lower inlet group 9 is arranged on housing 12 bottoms, in heat carrier in upper inlet group 6 and heat carrier lower inlet group 7 axially be set in qually spaced between heating medium outlet group 4 and heat carrier lower inlet group 9, and be provided with distribution grid 5 between upper inlet group 6 in heating medium outlet group 4 and heat carrier, be provided with middle distribution grid 14 between lower inlet group 7 in upper inlet group 6 and heat carrier in heat carrier, be provided with lower distribution grid 8 between lower inlet group 7 and heat carrier lower inlet group 9 in heat carrier.
In embodiment 1, reaction tube 11 external diameter 36-45mm, length 5m, total 5000-7500 root; Reactor shell 12 diameter 4.0-5.5m; The opening 6A of upper inlet group in heat carrier, the opening 7A of lower inlet group in opening 6B and heat carrier, opening 7B distribution mode diametrically is for being interspersed.As described in Figure 3.
The operating process of novel reactor is as follows: unstripped gas enters gas distributor 2 by gas access 1, gas is evenly distributed to each root tubulation, gas enters in reaction tube 11, react generation vinyl acetate and a small amount of accessory substance under the catalytic action of the catalyst in being placed in described reaction tube 11, the mixed tail gas that vinyl acetate, accessory substance and unreacted unstripped gas form enters the subsequent treatment operation by gas vent 10.In this simultaneously, part heat carrier is from heat carrier import group 9 (opening 9A, opening 9B) enter cavity between reactor shell 12 and reaction tube 11, a part of heat carrier is from heat carrier import group 6 (opening 6A in addition, opening 6B), heat carrier import group 7 (opening 7A, opening 7B) in one group or two groups of imports enter the cavity between reactor shell 12 and reaction tube 11, and all heat carriers are from heating medium outlet group 4 (opening 4A, opening 4B) outflow reactor at last.In the production process of vinyl acetate, both having responded in reaction tube produces the process of heat, has again heat carrier to discharge the process of reactor by the heat in heat exchange absorption reaction pipe, and two processes occur simultaneously.So have maximum temperature point, i.e. a focus in certain position, the centre of reaction tube 11.Top or lowermost end at reaction tube 11 have a temperature minimum point, and the difference between hot(test)-spot temperature and this minimum temperature is axial maximum temperature difference.In the early stage of device operation, hotspot location is in the middle and upper part of reaction tube 11, when focus is between heating medium outlet group 4 and heat carrier import group 6, heat carrier import group 6 (opening 6A are opened in selection, opening 6B), close heat carrier import group 7 (opening 7A, opening 7B).Along with the reaction carrying out, focus moves down gradually, when hotspot location lower than (opening 6A, during opening 6B) and higher than (opening 7A, opening 7B), open heat carrier import group (opening 7A, opening 7B), close heat carrier import group (opening 6A, opening 6B).Heat carrier import group in this process (opening 9A, opening 9B) remains open mode.
the utility model includes but not limited to the above specific embodiment, at the top of described reactor shell heating medium outlet group (opening 4A, opening 4B) and lowermost end heat carrier import group (opening 9A, the heat carrier import group of setting up opening 9B) also can be one group or three groups or more groups, as long as at the top of described reactor shell heating medium outlet group (opening 4A, opening 4B) and lowermost end heat carrier import group (opening 9A, opening 9B) between, have additional the reactor of heat carrier import group, within all dropping on protection domain of the present utility model.
the utility model includes but not limited to the above specific embodiment, at the top of described reactor shell heating medium outlet group (opening 4A, opening 4B) and lowermost end heat carrier import group (opening 9A, the opening distribution mode diametrically of some heat carrier import groups of setting up opening 9B) can be also overlapping distribution, as described in Figure 2, as long as at the top of described reactor shell heating medium outlet group (opening 4A, opening 4B) and lowermost end heat carrier import group (opening 9A, opening 9B) between, no matter the opening distribution mode diametrically of some heat carrier import groups of setting up is overlapping distribution or is interspersed, within all dropping on protection domain of the present utility model.
the utility model includes but not limited to the above specific embodiment, at the top of described reactor shell heating medium outlet group (opening 4A, opening 4B) and lowermost end heat carrier import group (opening 9A, the open amount of each group of some heat carrier import groups of setting up opening 9B) can be one, three or more, as long as at the top of described reactor shell heating medium outlet group (opening 4A, opening 4B) and lowermost end heat carrier import group (opening 9A, opening 9B) between, the open amount of each group of some heat carrier import groups of setting up, no matter it is one, two or more, within all dropping on protection domain of the present utility model.
Claims (9)
1. Novel acetate ethylene reaction device, comprise housing, be positioned at the reaction tube of housing, be positioned at the heating medium outlet group on housing top and be positioned at housing bottom heat carrier lower inlet group, case top is provided with upper cover, this upper cover top is provided with gas distributor, this gas distributor connects the gas access, it is characterized in that, sets up at least one group of heat carrier import group between described heating medium outlet group and heat carrier lower inlet group.
2. a kind of Novel acetate ethylene reaction device according to claim 1, is characterized in that, sets up two groups of heat carrier import groups between described heating medium outlet group and heat carrier lower inlet group, is respectively: lower inlet group in upper inlet group and heat carrier in heat carrier.
3. a kind of Novel acetate ethylene reaction device according to claim 2, is characterized in that, the heat carrier import group of setting up between described heating medium outlet group and heat carrier lower inlet group has many groups, selective wherein a group or the many groups of use simultaneously used.
4. according to claim 1 and 2 or 3 described a kind of Novel acetate ethylene reaction devices, is characterized in that, described heating medium outlet group, heat carrier lower inlet group and the number of openings of respectively organizing every group of heat carrier import group of setting up at least one.
5. a kind of Novel acetate ethylene reaction device according to claim 4, is characterized in that, the described heat carrier import group of respectively organizing is provided with a plurality of openings, selectively uses one of them opening or uses simultaneously a plurality of openings.
6. a kind of Novel acetate ethylene reaction device according to claim 5, is characterized in that, that sets up respectively organizes between heat carrier import group, and and heating medium outlet group, heat carrier lower inlet group between axially equidistantly distribute.
7. according to claim 5 or 6 described a kind of Novel acetate ethylene reaction devices, is characterized in that, the opening of respectively organizing heat carrier import group, heating medium outlet group and heat carrier lower inlet group of setting up being distributed as overlapping distribution or being interspersed diametrically.
8. a kind of Novel acetate ethylene reaction device according to claim 1, is characterized in that, the quantity of described reaction tube is the 5000-7500 root.
9. a kind of Novel acetate ethylene reaction device according to claim 1, is characterized in that, is provided with upper perforated plate between described housing and upper cover, described heating medium outlet group, respectively organizes heat carrier import group and be equipped with each other distribution grid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220697088 CN203002339U (en) | 2012-12-14 | 2012-12-14 | Novel vinyl-acetate reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220697088 CN203002339U (en) | 2012-12-14 | 2012-12-14 | Novel vinyl-acetate reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203002339U true CN203002339U (en) | 2013-06-19 |
Family
ID=48593975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220697088 Expired - Lifetime CN203002339U (en) | 2012-12-14 | 2012-12-14 | Novel vinyl-acetate reactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203002339U (en) |
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2012
- 2012-12-14 CN CN 201220697088 patent/CN203002339U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI PUJING CHEMICAL INDUSTRY TECHNOLOGY CO., Free format text: FORMER NAME: PUJING CHEMICAL INDUSTRY (SHA) LIMITED |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 201600 Zhongshan Songjiang District Road, No. 62, building eleventh, room 1, Building 102 Patentee after: PUJING CHEMICAL INDUSTRY Co.,Ltd. Address before: 201600 Zhongshan Songjiang District Road, No. 62, building eleventh, room 1, Building 102 Patentee before: Pujing Chemical Industry (Shanghai) Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130619 |