CN211328198U - Rectifying tower for synthesizing and separating polymethoxy dimethyl ether - Google Patents
Rectifying tower for synthesizing and separating polymethoxy dimethyl ether Download PDFInfo
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- CN211328198U CN211328198U CN201921765988.5U CN201921765988U CN211328198U CN 211328198 U CN211328198 U CN 211328198U CN 201921765988 U CN201921765988 U CN 201921765988U CN 211328198 U CN211328198 U CN 211328198U
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Abstract
The utility model discloses a rectifying column of gathering methoxy dimethyl ether synthesis and separation and application method thereof in the technical field of energy chemical industry, include: a reaction tower; and the pre-reaction system is arranged at the top of the left side of the reaction tower through a pipeline. The utility model discloses the light component gasification of stripping section in with the reaction liquid enlarges the section to the tower in, utilizes formaldehyde critical temperature and not degree condensing condition to converge the nature of synthesizing different polymerization degree polymers simultaneously, and this polymer boiling point increases along with the polymerization degree increases. Almost all formaldehyde is converted into light components in the stripping section environment, and low-polymerization-degree formaldehyde is a relatively heavy component in the expansion section environment of the tower. The expanding section in the tower has enough gas-liquid phase space and catalyst wire gauze packing, and the formaldehyde is converted to great extent, while the small amount of free formaldehyde gas is condensed by the condenser after overflowing from the tower top, and part of the free formaldehyde gas participates in reflux and the other part of the free formaldehyde gas is sent to the methylal synthesizing unit.
Description
Technical Field
The utility model relates to an energy chemical industry technical field specifically is a rectifying column of gathering methoxy dimethyl ether synthesis and separation.
Background
Global energy has entered a severe exploitation period. High-quality energy is less and less, and the energy price is increasing. Particularly, after the crisis of crude oil, various countries have gradually started to reduce the production and increase the price of the crude oil. The oil price will gradually rise in the future. The energy structure of China is characterized in that: the coal, the oil and the gas are rich, the economy is continuously and rapidly increased, the energy demand is higher and higher, and the contradiction between the social and economic development and the petroleum supply is increasingly prominent. The development of coal liquefaction and oil formation technology is of strategic importance. In addition, the methanol productivity is seriously surplus in China, and the development of methanol downstream products and the extension of the industrial chain of coal chemical industry have practical significance. After the northwest coal production industry is subjected to multiple national industry adjustments, the original rough coal industry chain is further upgraded. Further deep processing of coal into methanol and the trend downstream has become a trend for the emerging coal industry in the future. With the progress of social economy, the number of automobiles is obviously increased, and automobile exhaust emissions become one of important causes of urban haze. Compared with gasoline, diesel oil has higher boiling point and low H/C mass ratio, so that more waste gases such as CO, oxynitride, particulate matters and the like are discharged in the combustion process of the diesel oil, and the pollution caused by the waste gases is more serious than that caused by the gasoline. Therefore, the improvement of diesel combustion efficiency, the reduction of pollution emission and the improvement of urban air quality are important environmental protection tasks at present.
The polymethoxy dimethyl ether is a recognized clean diesel oil component in the world, and the cetane number of the polymethoxy dimethyl ether is more than or equal to 70, and the polymethoxy dimethyl ether does not contain sulfur and aromatic hydrocarbon. The additive is added into diesel according to the proportion of 5-20 percent, can improve the cetane number of the diesel, promote combustion and obviously reduce the emission of harmful gases such as PM2.5, PM10, NOx, CO and the like in automobile exhaust. Due to the excellent performance of polyoxymethylene dimethyl ethers, the synthesis process thereof has become a popular subject of domestic and foreign research.
At present, polymethoxy dimethyl ether is mostly generated by reacting methylal/methanol with formaldehyde (formaldehyde can be from aqueous formaldehyde solution/trioxymethylene/paraformaldehyde) under the catalysis of an acid catalyst. For the separation of the residual unreacted formaldehyde in the reaction solution, alkali neutralization reaction is generally adopted, and after the alcohol substances are generated by hydrogenation, conventional rectification separation is carried out. Since the alkali neutralizes formaldehyde in the reaction solution, a large amount of raw materials are consumed, and a large amount of sewage is generated. The industrial production is not economical. Hydrogenation results in high power consumption and high hydrogen cost. If formaldehyde is not treated and is directly distilled, the temperature is high, and the formaldehyde is easily subjected to disproportionation reaction to generate formic acid in the process of heating and vaporizing reaction liquid. The formic acid decomposes the product during the separation process to produce methylal and formaldehyde. The process has low separation efficiency, and the product is further decomposed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a rectifying column of gathering methoxy dimethyl ether synthesis and separation to it is most with methylal/methyl alcohol and formaldehyde (formaldehyde can come from formalin/trioxymethylene/paraformaldehyde) reaction under the catalytic action of acid catalyst and generates to gather methoxy dimethyl ether that proposes in the above-mentioned background art to solve. For the separation of the residual unreacted formaldehyde in the reaction solution, alkali neutralization reaction is generally adopted, and after the alcohol substances are generated by hydrogenation, conventional rectification separation is carried out. Since the alkali neutralizes formaldehyde in the reaction solution, a large amount of raw materials are consumed, and a large amount of sewage is generated. The industrial production is not economical. Hydrogenation results in high power consumption and high hydrogen cost. If formaldehyde is not treated and is directly distilled, the temperature is high, and the formaldehyde is easily subjected to disproportionation reaction to generate formic acid in the process of heating and vaporizing reaction liquid. The formic acid decomposes the product during the separation process to produce methylal and formaldehyde. The separation efficiency of the process is low, and the product is further decomposed.
In order to achieve the above object, the utility model provides a following technical scheme: a rectifying tower for synthesizing and separating polymethoxy dimethyl ether comprises:
a reaction tower;
the pre-reaction system is arranged at the top of the left side of the reaction tower through a pipeline;
the condensation system is arranged at the top of the right side of the reaction tower through a pipeline;
a reboiling system installed at the bottom of the right side of the reaction column through a pipe.
Preferably, the reaction column comprises:
a rectifying section;
the reaction section is welded at the bottom of the rectifying section and communicated with the rectifying section;
and the stripping section is welded at the bottom of the reaction section and communicated with the reaction section.
Preferably, the rectifying section comprises:
a first outer case;
the first filling devices are longitudinally installed on the side wall of the inner cavity of the first outer shell in a staggered mode.
Preferably, the reaction section comprises:
the second shell is welded at the bottom of the first outer shell and communicated with the first outer shell;
a second filler device mounted within the inner cavity expanded section of the second housing;
the spray pipe is arranged at the bottom of the left side of the second shell, the right end of the spray pipe penetrates through the left side wall of the second shell and is connected with the inner cavity of the second shell in an inserting mode, and the spray pipe is arranged at the bottom of the second packing device.
Preferably, the stripping section comprises:
the third shell is welded at the bottom of the second shell, and the third shell is communicated with the second shell;
the third seasoning devices are longitudinally and alternately arranged on the left side wall and the right side wall of the inner cavity of the third shell;
the finished product pipeline is arranged on the left side of the bottom of the third shell and communicated with the third shell;
and the product extraction pump is arranged on the right side of the bottom of the finished product pipeline.
Preferably, the pre-reaction system comprises:
a pre-reactor;
the formaldehyde feeding pipeline is arranged on the left side of the pre-reactor and communicated with the pre-reactor;
the methylal feeding pipeline is arranged on the right side of the bottom of the outer wall of the formaldehyde feeding pipeline, and the methylal feeding pipeline is communicated with the formaldehyde feeding pipeline;
the left end of the coarse reaction liquid discharging pipeline is installed on the right side of the pre-reactor, the coarse reaction liquid discharging pipeline is communicated with the pre-reactor, the right end of the coarse reaction liquid discharging pipeline is installed at the top of the left side of the first outer shell, and the coarse reaction liquid discharging pipeline is communicated with the first outer shell.
Preferably, the condensing system comprises:
a condenser;
one end of the air inlet pipeline is mounted at the top of the condenser and communicated with the condenser, the other end of the air inlet pipeline is mounted at the top of the first outer shell, and the air inlet pipeline is communicated with the first outer shell;
the liquid pump is arranged at the bottom of the condenser through a pipeline;
the right end of the first liquid inlet pipe is installed on the left side of the liquid pump, the left end of the first liquid inlet pipe is installed at the top of the right side of the first outer shell, and the first liquid inlet pipe is communicated with the first outer shell;
the liquid outlet pipe is installed at the bottom of the outer wall of the first liquid inlet pipe and communicated with the first liquid inlet pipe.
Preferably, the reboiling system includes:
a reboiler;
the right end of the gas outlet pipe is installed at the left end of the reboiler, the gas outlet pipe is communicated with the reboiler, the left end of the gas outlet pipe is installed at the bottom of the right side of the third shell, and the gas outlet pipe is communicated with the third shell;
and one end of the second liquid inlet pipe is installed at the bottom of the reboiler, the second liquid inlet pipe is communicated with the reboiler, the other end of the second liquid inlet pipe is installed at the right side of the bottom of the third shell, and the second liquid inlet pipe is communicated with the third shell.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model adopts the principle of catalytic rectification combined with rectification and reaction, combines the peculiar gas-liquid data of raw materials, makes a tower integrating the expansion synthesis and separation of an intermediate reaction section, can simply and efficiently obtain the products of 2-8 in the polymethoxy dimethyl ether component, realizes the completion of the separation and reaction in a tower, solves the problems of long flow, low single conversion efficiency, harsh raw material water content and the like in the previous synthesis and separation of polymethoxy dimethyl ether products, the utility model discloses a distillation section gasifies the light components in the reaction liquid to the expansion section in the tower, simultaneously utilizes the formaldehyde critical temperature of 140 ℃ and condensation to converge and synthesize polymer with low polymerization degree, a reboiler changes formaldehyde into non-condensable gas gasification, the expansion section in the tower has enough gas-liquid phase space and is provided with catalyst wire mesh filler, formaldehyde obtains great degree conversion here, and a very small amount of free formaldehyde gas is condensed by a condenser after overflowing from the top of the tower, part of the mixture is refluxed and part of the mixture is sent to a methylal synthesis unit.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the reaction tower of the present invention;
FIG. 3 is a schematic view of the rectifying section of the present invention;
FIG. 4 is a schematic structural view of the reaction section of the present invention;
FIG. 5 is a schematic view of the stripping section of the present invention;
FIG. 6 is a schematic structural view of the pre-reaction system of the present invention;
FIG. 7 is a schematic view of the condensing system of the present invention;
fig. 8 is a schematic diagram of the reboiling system of the present invention.
In the figure: 100 reaction tower, 110 rectifying section, 111 first outer shell, 112 first packing device, 120 reaction section, 121 second shell, 122 second packing device, 123 spray pipe, 130 stripping section, 131 third shell, 132 third seasoning device, 133 finished product pipeline, 134 product extraction pump, 200 pre-reaction system, 210 pre-reactor, 220 formaldehyde feed pipeline, 230 methylal feed pipeline, 240 crude reaction liquid discharge pipeline, 300 condensing system, 310 condenser, 320 gas inlet pipeline, 330 liquid pump, 340 first liquid inlet pipe, 350 liquid outlet pipe, 400 reboiling system, reboiler 410, 420 gas outlet pipe, 430 second liquid inlet pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a rectifying column for synthesizing and separating polymethoxy dimethyl ether, which has simple process and outstanding separation effect, the synthesis and separation are mixed in one column, the investment is greatly reduced by the simple process, please refer to figure 1, comprising a reaction tower 100, a pre-reaction system 200, a condensing system 300 and a reboiling system 400;
referring to fig. 1-5, a reaction tower 100 includes:
the rectifying section 110 includes:
a first outer case 111;
a plurality of first packing devices 112 are longitudinally and alternately arranged on the side wall of the inner cavity of the first outer shell 111, the first packing devices 112 are regular wire mesh packing or bubble cap trays, crude reaction liquid entering the rectification section further converts incomplete formaldehyde and residual moisture in the crude reaction liquid through the rectification section, a small amount of formaldehyde remaining in the crude reaction liquid is gasified into formaldehyde gas in the rectification section, and a very small amount of free formaldehyde overflows into a condensation system from the top of the tower;
the reaction section 120 is welded at the bottom of the rectification section 110, the reaction section 120 is communicated with the rectification section 110, the ratio of the maximum diameter of the reaction section 120 to the maximum diameter of the rectification section 110 is 1.2-2.8:1, a small amount of formaldehyde gas passes through the reaction section and is sprayed and absorbed by methylal in the reaction section to fall into the reaction section, so that the reaction raw material formaldehyde is converted into a target product to the maximum extent, and the residual reaction liquid after the formaldehyde conversion enters the stripping section 130, wherein the reaction section 120 comprises:
the second shell 121 is welded at the bottom of the first outer shell 111, and the second shell 121 is communicated with the first outer shell 111;
the second packing device 122 is installed in the inner cavity expansion section of the second shell 121, the second packing device 122 is structured wire mesh packing, and the catalyst is wrapped by a 80-120-mesh stainless wire mesh and is uniformly filled in the middle of the structured packing in a volume ratio of 1: 10;
the spray pipe 123 is installed at the bottom of the left side of the second housing 121, the right end of the spray pipe 123 penetrates through the left side wall of the second housing 121 and is inserted into the inner cavity of the second housing 121, and the spray pipe 123 is installed at the bottom of the second packing device 122;
the stripping section 130 is welded at the bottom of the reaction section 120, the stripping section 130 is communicated with the reaction section 120, the temperature of the stripping section is higher than 140 ℃, and sufficient gasification of formaldehyde is ensured, so that the purpose of 0 content of formaldehyde in the product is realized, and the stripping section 130 comprises:
the third shell 131 is welded at the bottom of the second shell 121, and the third shell 131 is communicated with the second shell 121;
a plurality of third seasoning devices 132 are longitudinally and alternately arranged on the left and right side walls of the inner cavity of the third shell 131, and the third seasoning devices 132 are structured wire mesh packing or float valve trays;
the finished product pipeline 133 is installed at the left side of the bottom of the third shell 131, and the finished product pipeline 133 is communicated with the third shell 131;
a product extraction pump 134 is installed at the right side of the bottom of the finished product pipeline 133;
a pre-reaction system 200, the pre-reaction system 200 being installed at the top of the left side of the reaction tower 100 through a pipe, the pre-reaction system 200 comprising:
referring to fig. 1 and 6, the pre-reactor 210 is a fixed bed type, the operating pressure is 0.1-0.8Mpa, the operating temperature is 40-120 ℃, the function of the pre-reactor is mainly to rapidly react the formaldehyde material with higher concentration, thereby effectively preventing the problem that the formaldehyde with high concentration is easy to polymerize, meanwhile, the pre-reactor catalyst is relatively easy to fill and replace, and the pollution impurities contained in the material are intercepted by the pre-reactor, thereby protecting the catalyst in the reaction tower 100 from being polluted, increasing the service life, and pre-reacting the formaldehyde through the pre-reactor 210;
the formaldehyde feeding pipeline 220 is arranged on the left side of the pre-reactor 210, the formaldehyde feeding pipeline 220 is communicated with the pre-reactor 210, and formaldehyde enters the pre-reactor through the formaldehyde feeding pipeline 220;
the methylal feeding pipeline 230 is arranged at the right side of the bottom of the outer wall of the formaldehyde feeding pipeline 220, the methylal feeding pipeline 230 is communicated with the formaldehyde feeding pipeline 220, and methylal enters the pre-reactor through the methylal feeding pipeline 230 to react with formaldehyde;
the left end of thick reaction liquid ejection of compact pipeline 240 installs the right side at prereactor 210, thick reaction liquid ejection of compact pipeline 240 link up mutually with prereactor 210, the left side top at first shell body 111 is installed to the right-hand member of thick reaction liquid ejection of compact pipeline 240, thick reaction liquid ejection of compact pipeline 240 link up mutually with first shell body 111, the thick reaction liquid that obtains after the pre-reaction enters into rectifying section 110 through thick reaction liquid ejection of compact pipeline 240 in, the conversion rate that reaction liquid after the pre-reaction can obtain water and formaldehyde is respectively: 34.8% and 28.5%;
referring to fig. 1 and 7, a condensing system 300 is installed at the top of the right side of the reaction tower 100 by a pipe, and the condensing system 300 includes:
the condenser 310 adopts a plate heat exchanger with a compact structure, the heat exchange area is 100 plus 500 square meters, and the cooling medium is circulating cooling water;
one end of the air inlet pipe 320 is installed on the top of the condenser 310, the air inlet pipe 320 is communicated with the condenser 310, the other end of the air inlet pipe 320 is installed on the top of the first outer shell 111, and the air inlet pipe 320 is communicated with the first outer shell 111;
the liquid pump 330 is installed at the bottom of the condenser 310 through a pipe;
the right end of the first liquid inlet pipe 340 is installed on the left side of the liquid pump 330, the left end of the first liquid inlet pipe 340 is installed on the top of the right side of the first outer shell 111, and the first liquid inlet pipe 340 is communicated with the first outer shell 111;
the liquid outlet pipe 350 is arranged at the bottom of the outer wall of the first liquid inlet pipe 340, and the liquid outlet pipe 350 is communicated with the first liquid inlet pipe 340;
referring to fig. 1 and 8, a reboiling system 400 is installed at the bottom of the right side of the reaction tower 100 through a pipe, and the reboiling system 400 includes:
the reboiler 410 adopts a tubular heat exchanger which is easy to clean, the heat exchange area is 100 plus 500 square meters, and the heating medium is 0.5-3.0Mpa steam;
the right end of the gas outlet pipe 420 is arranged at the left end of the reboiler 410, the gas outlet pipe 420 is communicated with the reboiler 410, the left end of the gas outlet pipe 420 is arranged at the bottom of the right side of the third shell 131, and the gas outlet pipe 420 is communicated with the third shell 131;
one end of a second liquid inlet pipe 430 is arranged at the bottom of the reboiler 410, the second liquid inlet pipe 430 is communicated with the reboiler 410, the other end of the second liquid inlet pipe 430 is arranged at the right side of the bottom of the third shell 131, the second liquid inlet pipe 430 is communicated with the third shell 131, reaction liquid enters the reboiler 410 through the second liquid inlet pipe 430 to be subjected to gasification separation to obtain gas mainly comprising polymethoxy dimethyl ether, the gas enters the stripping section 130 through a pipeline, and the gas is pumped out through the air pump 134 to be condensed to generate the polymethoxy dimethyl ether.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the various features of the disclosed embodiments of the present invention can be used in any combination with each other, and the description of such combinations is not exhaustive in the present specification only for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (8)
1. A rectifying tower for synthesizing and separating polymethoxy dimethyl ether is characterized in that: the method comprises the following steps:
a reaction tower (100);
a pre-reaction system (200), wherein the pre-reaction system (200) is arranged at the top of the left side of the reaction tower (100) through a pipeline;
a condensing system (300), wherein the condensing system (300) is installed at the top of the right side of the reaction tower (100) through a pipeline;
a reboiling system (400), the reboiling system (400) being mounted at the bottom of the right side of the reaction column (100) by piping.
2. The rectifying tower for synthesis and separation of polymethoxy dimethyl ether according to claim 1, wherein: the reaction column (100) comprises:
a rectifying section (110);
the reaction section (120) is welded at the bottom of the rectifying section (110), and the reaction section (120) is communicated with the rectifying section (110);
the stripping section (130) is welded at the bottom of the reaction section (120), and the stripping section (130) is communicated with the reaction section (120).
3. The rectifying tower for synthesis and separation of polymethoxy dimethyl ether according to claim 2, wherein: the rectifying section (110) comprises:
a first outer case (111);
a plurality of first packing devices (112), and a plurality of first packing devices (112) are longitudinally and alternately arranged on the inner cavity side wall of the first outer shell (111).
4. The rectifying tower for synthesis and separation of polymethoxy dimethyl ether according to claim 2, wherein: the reaction section (120) comprises:
a second housing (121);
a second filler means (122), said second filler means (122) being mounted within the inner cavity expanding section of said second housing (121);
the spray pipe (123) is installed at the bottom of the left side of the second shell (121), the right end of the spray pipe (123) penetrates through the left side wall of the second shell (121) and is inserted into the inner cavity of the second shell (121), and the spray pipe (123) is arranged at the bottom of the second packing device (122).
5. The rectifying tower for synthesis and separation of polymethoxy dimethyl ether according to claim 2, wherein: the stripping section (130) comprises:
a third housing (131);
a plurality of third seasoning devices (132), wherein the plurality of third seasoning devices (132) are longitudinally and alternately arranged on the left and right side walls of the inner cavity of the third shell (131);
the finished product pipeline (133) is mounted on the left side of the bottom of the third shell (131), and the finished product pipeline (133) is communicated with the third shell (131);
a product take-off pump (134), the product take-off pump (134) being mounted at the bottom right side of the finished product conduit (133).
6. The rectifying tower for synthesis and separation of polymethoxy dimethyl ether according to claim 1, wherein: the pre-reaction system (200) comprises:
a pre-reactor (210);
a formaldehyde feeding pipeline (220), wherein the formaldehyde feeding pipeline (220) is installed at the left side of the pre-reactor (210), and the formaldehyde feeding pipeline (220) is communicated with the pre-reactor (210);
a methylal feeding pipeline (230), wherein the methylal feeding pipeline (230) is installed at the right side of the bottom of the outer wall of the formaldehyde feeding pipeline (220), and the methylal feeding pipeline (230) is communicated with the formaldehyde feeding pipeline (220);
the device comprises a crude reaction liquid discharging pipeline (240), wherein the left end of the crude reaction liquid discharging pipeline (240) is installed on the right side of the pre-reactor (210), and the crude reaction liquid discharging pipeline (240) is communicated with the pre-reactor (210).
7. The rectifying tower for synthesis and separation of polymethoxy dimethyl ether according to claim 1, wherein: the condensation system (300) comprises:
a condenser (310);
the air inlet pipeline (320), one end of the air inlet pipeline (320) is installed on the top of the condenser (310), and the air inlet pipeline (320) is communicated with the condenser (310);
an extraction pump (330), wherein the extraction pump (330) is installed at the bottom of the condenser (310) through a pipeline;
the right end of the first liquid inlet pipe (340) is arranged on the left side of the liquid pump (330);
drain pipe (350), drain pipe (350) are installed the outer wall bottom of first feed liquor pipe (340), drain pipe (350) with first feed liquor pipe (340) link up mutually.
8. The rectifying tower for synthesis and separation of polymethoxy dimethyl ether according to claim 1, wherein: the reboiling system (400) includes:
a reboiler (410);
the right end of the gas outlet pipe (420) is installed at the left end of the reboiler (410), and the gas outlet pipe (420) is communicated with the reboiler (410);
and a second liquid inlet pipe (430), wherein one end of the second liquid inlet pipe (430) is installed at the bottom of the reboiler (410), and the second liquid inlet pipe (430) is communicated with the reboiler (410).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110559678A (en) * | 2019-10-21 | 2019-12-13 | 无锡赫利邦化工科技有限公司 | rectifying tower for synthesizing and separating polymethoxy dimethyl ether and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110559678A (en) * | 2019-10-21 | 2019-12-13 | 无锡赫利邦化工科技有限公司 | rectifying tower for synthesizing and separating polymethoxy dimethyl ether and use method thereof |
| CN110559678B (en) * | 2019-10-21 | 2024-02-27 | 无锡赫利邦化工科技有限公司 | Rectifying tower for synthesizing and separating polymethoxy dimethyl ether and application method thereof |
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Denomination of utility model: A distillation column for synthesis and separation of polymethoxydimethyl ether Effective date of registration: 20220125 Granted publication date: 20200825 Pledgee: BEIJING PETROCHEMICAL ENGINEERING Co.,Ltd. Pledgor: Wuxi Helibang Chemical Technology Co.,Ltd. Registration number: Y2022990000060 |