CN216172171U - Gas cooler for improving quality and increasing efficiency of phthalic anhydride - Google Patents
Gas cooler for improving quality and increasing efficiency of phthalic anhydride Download PDFInfo
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- CN216172171U CN216172171U CN202122634078.7U CN202122634078U CN216172171U CN 216172171 U CN216172171 U CN 216172171U CN 202122634078 U CN202122634078 U CN 202122634078U CN 216172171 U CN216172171 U CN 216172171U
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Abstract
The embodiment of the utility model provides a phthalic anhydride quality-improving and efficiency-increasing gas cooler, which comprises a box body, wherein one end of the box body is connected with an oxidation reactor, the other end of the box body is connected with a phthalic anhydride switching condenser, and the gas cooler also comprises: the catalyst component is arranged in the box body and is used for enabling the mixed gas from the oxidation reactor to enter the catalyst in the box body for reaction and then enter the phthalic anhydride switching condenser; a front cooling member provided in the case, the front cooling member being located upstream of the catalyst assembly in a flow direction of the mixed gas; and a rear cooling member provided in the case, the rear cooling member being located downstream of the catalyst assembly in a flow direction of the mixed gas. The gas cooler can enable the intermediate product generated in the oxidation reaction process of the phthalic anhydride to continuously react with oxygen in the air on the catalyst component in the box body to generate the phthalic anhydride, and the harmful intermediate product which can not be converted into the phthalic anhydride is oxidized into carbon dioxide and water, so that the yield and the quality of the phthalic anhydride are improved.
Description
Technical Field
The utility model relates to the technical field of phthalic anhydride oxidation production, in particular to a gas cooler for improving the quality and the efficiency of phthalic anhydride.
Background
Phthalic anhydride is an important organic chemical raw material and is widely applied to industries such as plasticizers, unsaturated polyester resins, alkyd resins, saccharin, medicines, pesticides and the like. The phthalic anhydride is produced by three production methods according to different raw materials, namely industrial naphthalene, o-xylene, and the mixture of the industrial naphthalene and the o-xylene are used as raw materials, and are generated by gas phase oxidation in a fixed bed reactor under the action of a catalyst, the phthalic anhydride generated by the gas phase oxidation reaction contains various intermediate products and impurities, and is called as crude phthalic anhydride, and the crude phthalic anhydride is subjected to subsequent rectification processing to produce the industrial phthalic anhydride.
The theoretical yield of the phthalic anhydride produced by oxidizing industrial naphthalene used as a raw material is 115.6 percent, while the oxidation yield in the actual production is about 91.7 percent; the theoretical yield of the phthalic anhydride produced by oxidizing o-xylene as a raw material is 139.6 percent, and the oxidation yield in the actual production is about 110 percent. The difference between the theoretical oxidation yield and the actual oxidation yield is mainly consumed by intermediate products and peroxide products, the intermediate products not only influence the yield of raw materials and cause resource waste, but also greatly influence the product quality, wherein the intermediate products naphthoquinone and phthalimide generated in the process of producing phthalic anhydride by taking industrial naphthalene as raw materials and the intermediate products phthalide and anthraquinone generated in the process of producing phthalic anhydride by taking o-xylene as raw materials cannot be completely removed in the subsequent rectification process, and influence the product quality.
On the existing phthalic anhydride production device, the intermediate product in the oxidation production process of phthalic anhydride has no mature conversion technology, and most of the intermediate product can be separated from phthalic anhydride only by using a rectification technology, so that the phthalic anhydride meets the quality requirement. The prior document shows that the technology of adding a pipeline post reactor and a vertical post reactor between a phthalic anhydride oxidation reactor and a gas cooler cannot be normally used due to the following two defects, namely, the used annular catalyst is accumulated in the post reactor, so that the system resistance is too high, and a large amount of energy consumption is increased; secondly, as the temperature of the phthalic anhydride mixed gas from the phthalic anhydride oxidation reactor is generally about 370 ℃, the mixed gas directly enters the catalyst of the post reactor without temperature reduction measures, and the catalyst in the post reactor is quickly inactivated and loses efficacy under the condition of over-temperature operation.
Although the prior art has the square honeycomb type block catalyst technology of adding independent equipment between a phthalic anhydride reactor and a gas cooler to implement reaction gas cooling and further optimize oxidation, the two defects can be overcome, but the equipment for improving the quality and the efficiency of phthalic anhydride is independent, so that the investment is high, a certain plane space is occupied, the difficulty of newly building a device is low, the existing device is limited by the space and cannot be implemented, the equipment investment is reduced, and the problem that the existing device is installed without space is solved.
SUMMERY OF THE UTILITY MODEL
In view of the above problems with the prior art, it is an object of embodiments of the present invention to provide an enhanced efficiency gas cooler for phthalic anhydride upgrading.
The embodiment of the utility model adopts the technical scheme that the gas cooler for improving the quality and the efficiency of phthalic anhydride comprises a box body, wherein one end of the box body is connected with an oxidation reactor, the other end of the box body is connected with a phthalic anhydride switching condenser, and the gas cooler also comprises:
the catalyst component is arranged in the box body and is used for enabling the mixed gas from the oxidation reactor to enter the catalyst in the box body for reaction and then enter the phthalic anhydride switching condenser;
a front cooling member provided in the case, the front cooling member being located upstream of the catalyst assembly in a flow direction of the mixed gas;
and a rear cooling member provided in the case, the rear cooling member being located downstream of the catalyst assembly in a flow direction of the mixed gas.
In some embodiments, the catalyst assembly includes a holder having an outer circumference seamlessly integrated with an inner wall of the tank and a catalyst disposed on the holder, the catalyst being seamlessly integrated with the holder, the catalyst assembly partitioning the tank into a front region connected with the oxidation reactor and a rear region connected with the phthalic anhydride-switching condenser, the mixed gas from the oxidation reactor entering the front region and passing through the catalyst entering the rear region.
In some embodiments, the support is provided with rectangular filling holes, the catalyst is in a honeycomb block shape, and the catalyst is filled in the filling holes and is tightly attached to the hole walls of the filling holes.
In some embodiments, the axial direction of the honeycomb holes on the catalyst is parallel to the flow direction of the mixed gas.
In some embodiments, the pre-cooling component and the post-cooling component are both cooling tube bundles.
In some embodiments, the number of sets of cooling tube bundles of the front cooling component is less than the number of sets of cooling tube bundles of the rear cooling component; the number of the groups of the cooling tube bundles of the front-mounted cooling component is two; the number of the cooling tube bundles of the rear cooling component is five.
In some embodiments, the front cooling component, the bracket and the rear cooling component are integrated in the box body to form an integrated structure.
In some embodiments, an inspection manhole is provided in the tank body at least at a position between the catalyst assembly and the rear cooling unit.
In some embodiments, a front connection pipe and a rear connection pipe are respectively disposed at two opposite ends of the tank, the tank is connected to the oxidation reactor through the front connection pipe, and the tank is connected to the phthalic anhydride switching condenser through the rear connection pipe.
In some embodiments, thermometers are provided on each of the front and rear sides of the catalyst assembly.
Compared with the prior art, the gas cooler for improving the quality and the efficiency of the phthalic anhydride has the advantages that the intermediate product generated in the oxidation reaction process of the phthalic anhydride can continuously react with oxygen in the air on the catalyst component in the box body to generate the phthalic anhydride, and the harmful intermediate product which can not be converted into the phthalic anhydride is oxidized into carbon dioxide and water, so that the yield and the quality of the phthalic anhydride are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model.
The summary of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the full scope or all features of the disclosed technology.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments, by way of example and not by way of limitation, and together with the description and claims, serve to explain the embodiments of the utility model. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.
Fig. 1 is a schematic external structural view of a gas cooler according to an embodiment of the present invention.
Fig. 2 is a sectional view of a gas cooler according to an embodiment of the present invention.
Fig. 3 is a perspective view of a gas cooler tank according to an embodiment of the present invention in a top view.
Reference numerals:
1-a box body; 2-front cooling part; 3-a catalyst component; 4-front connection pipe; 5-rear pipe connection; 6-rupture disk; 7-inspection manhole; 8-a thermometer; 9-rear cooling part; 10-a pipeline; 11-oxidation reactor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the utility model without any inventive step, are within the scope of protection of the utility model.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the utility model have been omitted.
The embodiment of the utility model provides a gas cooler for improving the quality and the efficiency of phthalic anhydride. As shown in fig. 1 to 3, the gas cooler includes a tank 1, one end of the tank 1 is connected to an oxidation reactor 11, and the other end of the tank 1 is connected to a phthalic anhydride-switching condenser (not shown). That is, the tank 1 is a horizontal cylindrical shape, and opposite ends in the axial direction thereof are connected to the oxidation reactor 11 and the phthalic anhydride-switching condenser, respectively. For example, a front connection pipe 4 and a rear connection pipe 5 may be respectively disposed at the front and rear ends of the tank 1 in the axial direction, the front connection pipe 4 may be connected to the oxidation reactor 11 through a pipe 10, and the rear connection pipe 5 may be connected to the phthalic anhydride-switching condenser through a pipe 10. The oxidation reactor 11 can be used for producing phthalic anhydride by mixing industrial naphthalene and o-xylene as raw materials, and mixed gas containing phthalic anhydride generated in the production process of the phthalic anhydride enters the box body 1 through the front connecting pipe 4.
With continued reference to fig. 1 and 2, the gas cooler further comprises a catalyst assembly 3, a pre-cooler 2 and a post-cooler 9. The front cooling part 2, the catalyst assembly 3 and the rear cooling part 9 are arranged in the box body 1 at intervals from front to back. The pre-cooling section 2 is used to cool the mixed gas from the oxidation reactor 11 to a suitable temperature for the catalyst on the catalyst assembly 3. The mixed gas cooled by the preposed cooling part 2 enters the catalyst of the catalyst component 3 for high-selectivity reaction, and then enters the postposition cooling part 9 for cooling after the reaction is finished, so that the temperature of the mixed gas is reduced to the temperature required by the follow-up process.
It is to be understood that, in the present specification, front and rear refer to the direction of flow of the mixed gas as a reference, and the front is located upstream and the rear is located downstream in the direction of flow of the mixed gas. The front cooling member 2 is located on the front side of the catalyst assembly 3, and the rear cooling member 9 is located on the rear side of the catalyst assembly 3.
The gas cooler provided by the embodiment of the utility model can cool the mixed gas from the oxidation reactor 11, can enable the intermediate product which is not reacted in the oxidation reactor 11 to generate phthalic anhydride to continue to react to generate phthalic anhydride, and can enable the harmful intermediate product which cannot react to generate phthalic anhydride to be oxidized into carbon dioxide and water, so that the oxidation yield of the raw material is improved, the quality of the crude phthalic anhydride is improved, the subsequent rectification is easier to operate, the product quality is better, and the purposes of quality improvement and efficiency improvement are achieved. In addition, because the high-selectivity catalyst in the box body 1 has stronger capability of converting intermediate products generated in the oxidation reaction process, the oxidation reaction in the front oxidation reactor 11 can properly reduce the reaction temperature, and the service life of the catalyst in the oxidation reactor 11 is prolonged.
In some embodiments, the catalyst assembly 3 includes a holder having an outer circumference seamlessly integrated with an inner wall of the case 1 and a catalyst disposed on the holder, the catalyst being seamlessly integrated with the holder, the catalyst assembly 3 partitioning the case 1 into a front region connected to the oxidation reactor 11 and a rear region connected to the phthalic anhydride-switching condenser, the mixed gas from the oxidation reactor 11 entering the front region and passing through the catalyst entering the rear region. That is, no gap or clearance can be formed between the box body 1 and the bracket and between the bracket and the catalyst, so that the mixed gas can only pass through the catalyst and enter the rear cooling component 9 at the rear side of the catalyst component 3 after the mixed gas is subjected to oxidation reaction under the catalytic action of the catalyst. Thus, the naphthoquinone which is an intermediate product of the unreacted phthalic anhydride in the mixed gas is ensured to continuously react to form the phthalic anhydride, so that the yield of the phthalic anhydride is improved.
In some embodiments, the support is provided with rectangular filling holes, the catalyst is in a honeycomb block shape, and the catalyst is filled in the filling holes and is tightly attached to the hole walls of the filling holes. It is understood that all the filling holes need to be filled with the honeycomb block catalyst in a space to prevent the mixed gas from passing through the filling holes which are not filled with the catalyst from the occurrence of the oxidation reaction.
In some embodiments, the axial direction of the honeycomb holes on the catalyst may be parallel to the flow direction of the mixed gas to improve the efficiency of the oxidation reaction.
The catalyst assembly 3 may be provided in plural in order in the flow direction of the mixed gas to improve the efficiency of the oxidation of the intermediate product. As shown in fig. 2 and 3, two catalyst assemblies 3 are provided in the present embodiment.
The specific form and number of the front cooling component 2 and the rear cooling component 9, and the cooling media in the two components are not limited, and can be selected and determined according to actual needs. For example, the cooling medium may be cooled using saturated steam or boiler feed water. The front cooling element 2 and the rear cooling element 9 may both be cooling tube bundles. Because the temperature of the mixed gas which flows out of the oxidation reactor 11 and enters the front connecting pipe 4 is 360-370 ℃, the temperature needs to be reduced to about 330-340 ℃ through the front cooling part 2 so as to reach the proper temperature of the catalyst; the oxidation reaction on the mixed gas re-catalyst component 3 is an exothermic reaction, the temperature is raised by about 20-30 ℃, and the temperature is required to be reduced to about 185 ℃ through the post-arranged cooling component 9, so that the temperature requirement of the subsequent process can be met. That is, the front temperature decreases and the rear temperature decreases high, and therefore, the number of groups of the cooling tube bundles of the front cooling component 2 can be set smaller than the number of groups of the cooling tube bundles of the rear cooling component 9. For example, the number of groups of cooling tube bundles of the front cooling component 2 is two; the number of cooling tube bundles of the rear cooling unit 9 is five.
Between leading cooling unit 2 and the box 1 to and between catalyst subassembly 3 and the box 1, all can adopt detachable connection form, and detachable connection form conveniently overhauls and changes. For example, the tube plate of the front cooling member 2 and the tube plate of the holder of the catalyst module 3 may be connected to the case 1 by rectangular flanges, respectively.
The front cooling component 2, the bracket and the rear cooling component 9 can also be integrated in the box body 1 to form an integrated structure.
As shown in fig. 1 to 3, an inspection manhole 7 is provided at least at a position between the catalyst module 3 and the rear cooling unit 9 in the tank 1. The inside of the box body 1 can be observed through the inspection manhole 7, and the maintenance can be carried out by entering the box body 1 through the inspection manhole 7. The inspection manhole 7 of the present embodiment is provided in two, one of which is located on the case body 1 between the catalyst module 3 and the rear cooling member 9, and the other of which is located at the rear side of the rear cooling member 9.
With continued reference to fig. 1 to 3, thermometers 8 are provided on the front and rear sides of the catalyst assembly 3, respectively. The thermometer 8 is used to detect the temperature of the mixed gas entering the catalyst assembly 3 and the temperature of the mixed gas after the oxidation reaction has occurred on the catalyst assembly 3, and by detecting the temperature of the mixed gas, the flow rate and temperature of the cooling medium in the cooling part can be adjusted to control the temperature of the mixed gas within a reasonable range. The thermometer 8 can be electrically connected to a DCS control system, and automatic detection and control are realized.
As shown in fig. 1 to 3, a rupture disk 6 is further arranged above the front part of the box body 1, so that the rupture disk 6 acts to discharge fluid medium under dangerous working conditions, and the production safety is improved.
The gas cooler for improving the quality and the efficiency of the phthalic anhydride is suitable for not only newly-built phthalic anhydride devices, but also technical transformation of the gas cooler of the existing phthalic anhydride devices, can save investment and reduce occupied space, enables the existing devices to be transformed and used, can enlarge production capacity and improve product quality, and is a new technology with low investment, short investment recovery period and long-term device income.
The gas cooler for improving the quality and the efficiency of the phthalic anhydride has the beneficial effects that:
1. the structure design is scientific and reasonable, the structure is simple, and the installation is convenient.
2. The byproducts generated by the oxidation reactor are further reacted, the content of the byproducts is reduced, and the yield and the quality of the product are improved.
3. The service life of the catalyst of the oxidation reactor can be extended.
4. The catalyst system has small resistance, low energy consumption and considerable economic benefit.
5. Is more suitable for the transformation of a phthalic anhydride device with smaller space between an oxidation reactor and a gas cooler.
Principle of upgrading and increasing effect
According to the examples of the present invention, the production of phthalic anhydride by the naphthalene process is exemplified: the industrial naphthalene and oxygen in the air are subjected to main reaction on the surface of the catalyst to generate phthalic anhydride, and the reaction formula is as follows:
the intermediate product naphthoquinone produced by the side reaction of industrial naphthalene and oxygen in the air has the following reaction formula:
the intermediate product naphthoquinone after the gas cooler for improving the quality and the efficiency of the phthalic anhydride is added is further reacted to generate the phthalic anhydride, and the reaction formula is as follows:
the intermediate product maleic anhydride generated by the side reaction of industrial naphthalene and oxygen in the air has the following reaction formula:
after the gas cooler for improving the quality and the efficiency of phthalic anhydride is adopted, the intermediate product maleic anhydride is further oxidized into carbon dioxide and water, and the reaction formula is as follows:
from the above reaction, it can be seen that: after the quality-improving and efficiency-improving gas cooler is adopted, because the inside of the box body of the gas cooler is filled with the high-selectivity catalyst, the intermediate product naphthoquinone which does not react to form the phthalic anhydride continuously reacts to form the phthalic anhydride, and the harmful intermediate product which cannot react to form the phthalic anhydride and the maleic anhydride are oxidized into carbon dioxide and water, so that the oxidation yield of the raw materials is improved, the quality of the crude phthalic anhydride is improved, the subsequent rectification is easier to operate, the product quality is better, the quality-improving and efficiency-improving purposes are achieved, and meanwhile, the service life of the catalyst in the oxidation reactor can be prolonged.
The above description is intended to be illustrative, and not restrictive, and variations, modifications, substitutions, and alterations may be made to the above-described embodiments by those of ordinary skill in the art within the scope of the present disclosure. Also, the above-described examples (or one or more versions thereof) may be used in combination with each other, and it is contemplated that the embodiments may be combined with each other in various combinations or permutations. The scope of the utility model should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
Claims (10)
1. The utility model provides a phthalic anhydride upgrading and efficiency increasing's gas cooler, includes the box, the one end and the oxidation reactor of box are connected, the other end and the phthalic anhydride of box switch the condenser and are connected, its characterized in that, gas cooler still includes:
the catalyst component is arranged in the box body and is used for enabling the mixed gas from the oxidation reactor to enter the catalyst in the box body for reaction and then enter the phthalic anhydride switching condenser;
a front cooling member provided in the case, the front cooling member being located upstream of the catalyst assembly in a flow direction of the mixed gas;
and a rear cooling member provided in the case, the rear cooling member being located downstream of the catalyst assembly in a flow direction of the mixed gas.
2. The phthalic anhydride upgrading enhancement gas cooler of claim 1, wherein the catalyst assembly comprises a bracket and a catalyst disposed on the bracket, an outer periphery of the bracket seamlessly joins with an inner wall of the tank, the catalyst seamlessly joins with the bracket, the catalyst assembly partitions the tank into a front region connected with the oxidation reactor and a rear region connected with the phthalic anhydride switching condenser, and mixed gas from the oxidation reactor enters the front region and passes through the catalyst into the rear region.
3. The phthalic anhydride upgrading and efficiency increasing gas cooler according to claim 2, wherein the bracket is provided with rectangular filling holes, the catalyst is in a honeycomb block shape, and the catalyst is filled in the filling holes and is tightly attached to the wall of each filling hole.
4. The phthalic anhydride upgrading enhancement gas cooler of claim 3, wherein the axial direction of the honeycomb holes on the catalyst is parallel to the flow direction of the mixed gas.
5. The phthalic anhydride upgrading enhancement gas cooler of claim 1, wherein the pre-cooling component and the post-cooling component are cooling tube bundles.
6. The phthalic anhydride upgrading enhancement gas cooler of claim 5, wherein the number of cooling tube bundles of the front cooling component is less than the number of cooling tube bundles of the rear cooling component; the number of the groups of the cooling tube bundles of the front-mounted cooling component is two; the number of the cooling tube bundles of the rear cooling component is five.
7. The phthalic anhydride upgrading enhancement gas cooler of claim 2, wherein the front cooling component, the bracket, and the rear cooling component are integrated in the tank as an integrated structure.
8. The phthalic anhydride upgrading and efficiency enhancing gas cooler of claim 1, wherein an inspection manhole is provided at least at a position between the catalyst assembly and the rear cooling member on the tank body.
9. The phthalic anhydride upgrading synergistic gas cooler of claim 1, wherein a front connecting pipe and a rear connecting pipe are respectively arranged at two opposite ends of the tank body, the tank body is connected with the oxidation reactor through the front connecting pipe, and the tank body is connected with the phthalic anhydride switching condenser through the rear connecting pipe.
10. The phthalic anhydride upgrading enhancement gas cooler of claim 1, wherein the front and rear sides of the catalyst assembly are provided with thermometers, respectively.
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| CN202122634078.7U CN216172171U (en) | 2021-10-29 | 2021-10-29 | Gas cooler for improving quality and increasing efficiency of phthalic anhydride |
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| CN202122634078.7U CN216172171U (en) | 2021-10-29 | 2021-10-29 | Gas cooler for improving quality and increasing efficiency of phthalic anhydride |
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| CN216172171U true CN216172171U (en) | 2022-04-05 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A Gas Cooler for Improving Quality and Efficiency of Phthalic Anhydride Effective date of registration: 20230419 Granted publication date: 20220405 Pledgee: Xingtai Bank Co.,Ltd. Xingxiang Branch Pledgor: Xingtai Xuyang Chemical Co.,Ltd. Registration number: Y2023980038485 |
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