Fischer-Tropsch wax oxidation device

Abstract

The utility model discloses a Fischer-Tropsch wax oxidation device, which relates to the technical field of Fischer-Tropsch wax oxidation and comprises a feeding system, an oxidation reaction system, a gas-liquid separation system, an air conveying system, a tail gas treatment system and a heating system, the problems that a Fischer-Tropsch wax device is complex in structure, difficult to operate, incapable of achieving continuous production, small in device handling capacity, poor in gas-liquid contact effect, low in oxidation efficiency and deep in product color are effectively solved, and the Fischer-Tropsch wax oxidation device is simple in structure, convenient to operate, even in gas-liquid contact, high in oxidation efficiency, light in product color and environmentally friendly.

Description

Technical Field

[0001] The utility model belongs to the technical field of Fischer-Tropsch wax oxidation, and in particular relates to a Fischer-Tropsch wax oxidation device. Background Art

[0002] Fischer-Tropsch wax is a long-chain alkane produced by Fischer-Tropsch synthesis technology, and its carbon number ranges mainly from 20 to 100. The production process of Fischer-Tropsch wax determines that its composition is mainly straight-chain normal alkanes containing a small amount of isoalkanes, with extremely low sulfur, nitrogen, and aromatic content, metal residues at the ppm level, and the content of normal alkanes reaches 90-95%. It has excellent properties such as high melting point, low needle penetration, and low oil content. With the rapid development of coal-to-oil enterprises in my country, the production capacity of Fischer-Tropsch wax has also been continuously improved. However, most of the products produced are primary products with few varieties, low prices, and limited applications, which cannot meet the requirements of various industries. Therefore, modifying Fischer-Tropsch wax by chemical or physical means to prepare high-value-added refined wax and special wax products is in line with the development trend of the Fischer-Tropsch wax industry, and is conducive to the healthy development of the wax market and the resolution of supply and demand contradictions.

[0003] At present, in the modification of Fischer-Tropsch wax and the research and development of special waxes, most of the focus is on the modification and preparation of high value-added, good emulsification oxidized wax. After the wax is oxidized and modified, polar groups such as -OH, -COOH, C=O, and -COOR are added to the wax. The introduction of polar groups gives the oxidized wax products good emulsification, pigment dispersibility, lubricity and oil solubility, etc., and can be widely used in artificial boards, automobile industry, papermaking, agriculture, textiles, plastic processing, pigment dispersion and other fields, greatly expanding its application areas. Whether it is paraffin, animal and plant wax or Fischer-Tropsch wax, they are all composed of large molecular hydrocarbons and have commonality in industries such as candles and boards.

[0004] The oxidation of Fischer-Tropsch wax is generally carried out under certain reaction temperature and reaction time, and the raw wax reacts with air or oxygen to produce an oxidation reaction, which mainly includes catalytic oxidation and non-catalytic oxidation. The oxidized wax obtained by the modified process of catalytic oxidation has a dark color, which limits its application field and market price. The use of catalysts and subsequent separation also increase production costs. Non-catalytic oxidation has the disadvantages of long reaction time and low reaction efficiency.

[0005] Prior art related to the present invention: CN105087068A uses oxygen and initiator to oxidize Fischer-Tropsch coal to make wax without a catalyst. Although the process does not use a transition metal ion catalyst and will not affect the color and smell of the product, the device used for the oxidation reaction is a three-necked flask, and the oxygen fails to contact the molten Fischer-Tropsch wax evenly, resulting in poor dispersion of oxygen in the oxidation device. Therefore, the acid value and saponification value of the product still have room for further improvement. In addition, the oxygen used in the oxidation reaction causes a greater risk of volatile substances (vocs) in the tail gas reaching the explosion limit after contacting with oxygen, so this design is not conducive to large-scale development, production and application. Although the oxidizing ability of air is weaker than that of strong oxidizing gases such as oxygen and ozone, its mildness is more conducive to industrial applications.

[0006] CN 113797867A adopts a continuous microchannel reaction process to prepare oxidized coal-based Fischer-Tropsch wax under the action of air. Although this process can greatly improve the mass transfer efficiency, improve the Fischer-Tropsch wax-oxygen-containing gas heterogeneous reaction mixing efficiency, and shorten the reaction time, due to the micron-level channel size of the microreactor and the very complex internal structure, the reactor channel is very easy to block after the wax solidifies, and cleaning becomes very difficult. In addition, the microreactor adopts "number increase and amplification" to expand the production capacity. Although it can effectively reduce the amplification cost, the processing capacity is also greatly limited. When the number of microreactors increases, the complexity of microreactor monitoring and control will also increase accordingly, and its operating cost will also increase for actual production. At present, the technology for preparing oxidized wax mostly adopts a single small-scale aerated bubbling reactor device, and the flow rate, specific consumption, and dispersion of air will affect the oxidation depth of wax. In addition, the feeding, discharging and oxidation process are batch intermittent operations. After the oxidation process of a batch of wax is completed, it is necessary to stop the oxidation process, discharge the prepared oxidized wax from the reactor, and then re-feed for the next round of oxidation. Although this intermittent process has lower requirements for equipment, there is still room for improvement in the industrial application of this process.

[0007] At present, most of the Fischer-Tropsch wax oxidation devices are intermittently operated, with difficult operation process, complex device structure, poor gas-liquid contact effect, low oxidation efficiency, long reaction time, and dark product color. Most of them are in the laboratory research stage, difficult to scale up, small processing capacity, and low production efficiency. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide a Fischer-Tropsch wax oxidation device in view of the shortcomings of the background technology, such as the complex structure, difficult operation, inability to produce continuously, small device processing capacity, poor gas-liquid contact effect, low oxidation efficiency and dark product color.

[0009] The utility model adopts the following technical solutions to solve the above technical problems:

[0010] A Fischer-Tropsch wax oxidation device comprises a feeding system, an oxidation reaction system, a gas-liquid separation system, an air delivery system, a tail gas treatment system, and a heating system;

[0011] The feeding system is used to heat and melt the Fischer-Tropsch wax and then inject it into the oxidation reaction system;

[0012] an oxidation reaction system for reacting the Fischer-Tropsch wax with air;

[0013] The gas-liquid separation system is used to separate gas and liquid. The gas enters the tail gas treatment system for treatment, and the liquid is discharged as the oxidized wax product;

[0014] Air delivery system, used to input air into the gas-liquid separation system;

[0015] Tail gas treatment system, used to treat the gas separated by the gas-liquid separation system;

[0016] Heating system, for heating.

[0017] As a further preferred embodiment of the Fischer-Tropsch wax oxidation device of the utility model, the feed system comprises a raw material tank and a feed pump 1. The raw material tank is provided with a stirring paddle and is connected to a feed port of the oxidation reaction system through a pipeline.

[0018] As a further preferred embodiment of the Fischer-Tropsch wax oxidation device of the utility model, the oxidation reaction system comprises an oxidation reactor 1 and an oxidation reactor 2;

[0019] Among them, the bottom feed port of oxidation reactor 1 is connected to the feed system, oxidation reactor 1 and oxidation reactor 2 are provided with overflow ports, the liquid product enters the gas-liquid separation system through the overflow ports, and the unreacted air enters the tail gas treatment system from the upper interfaces of oxidation reactor 1 and oxidation reactor 2.

[0020] As a further preferred embodiment of the Fischer-Tropsch wax oxidation device of the utility model, the gas-liquid separation system comprises a gas-liquid separation tank 1, a gas-liquid separation tank 2 and a feed pump 2;

[0021] Among them, the gas-liquid separation tank 1 is connected to the liquid phase product of the oxidation reactor 1, and the bottom feed port is connected to the feed pump to produce the product separately or enter the bottom feed port of the oxidation reactor 2; the gas-liquid separation tank 2 is connected to the liquid phase product of the oxidation reactor 2, and the bottom discharge port produces the oxidized wax product.

[0022] As a further preferred embodiment of the Fischer-Tropsch wax oxidation device of the utility model, the air delivery system includes an air compressor, a buffer tank and a mass flow meter, which are connected by pipelines and enter the oxidation reactor 1 and the oxidation reactor 2 respectively through a gas distributor.

[0023] As a further preferred embodiment of the Fischer-Tropsch wax oxidation device of the utility model, the tail gas treatment system includes a condenser, an oil-water separator and an alkali washing tower.

[0024] As a further preferred embodiment of the Fischer-Tropsch wax oxidation device of the utility model, the heating system is thermal oil heating or electric heating.

[0025] As a further preferred embodiment of the Fischer-Tropsch wax oxidation device of the utility model, a gas distributor is provided at the bottom of the oxidation reactor 1 and the oxidation reactor 2. The gas distributor is provided with a plurality of gas outlet holes with a pore diameter of 15-40 μm, which are symmetrically distributed at the bottom of the oxidation reactor cavity.

[0026] As a further preferred embodiment of the Fischer-Tropsch wax oxidation device of the utility model, the pore diameter is 25-30 μm.

[0027] Compared with the prior art, the utility model adopts the above technical solution and has the following technical effects:

[0028] The utility model discloses a Fischer-Tropsch wax oxidation device, which comprises a feeding system, an oxidation reaction system, a gas-liquid separation system, an air conveying system, an exhaust gas treatment system and a heating system. The device can be operated continuously or intermittently, has a simple structure, is easy to operate, has uniform gas-liquid contact, has high oxidation efficiency, and has a light product color and is environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a structural principle diagram of a Fischer-Tropsch wax oxidation device of the utility model. DETAILED DESCRIPTION

[0031] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings:

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] The purpose of the utility model is to provide a carrier alarm device. The design is mainly divided into a signal detection conversion circuit, an alarm control circuit, a common part circuit, and a multi-channel alarm.

[0034] like Figure 1 As shown, a Fischer-Tropsch wax oxidation device comprises a feeding system, an oxidation reaction system, a gas-liquid separation system, an air delivery system, a tail gas treatment system, and a heating system;

[0035] The feeding system is used to heat and melt the Fischer-Tropsch wax and then inject it into the oxidation reaction system;

[0036] an oxidation reaction system for reacting the Fischer-Tropsch wax with air;

[0037] The gas-liquid separation system is used to separate gas and liquid. The gas enters the tail gas treatment system for treatment, and the liquid is discharged as the oxidized wax product;

[0038] Air delivery system, used to input air into the gas-liquid separation system;

[0039] Tail gas treatment system, used to treat the gas separated by the gas-liquid separation system;

[0040] Heating system, for heating.

[0041] Preferably, the feed system comprises a raw material tank and a feed pump 1, and the raw material tank is provided with a stirring paddle and is connected to a feed port of the oxidation reaction system through a pipeline.

[0042] Preferably, the oxidation reaction system comprises an oxidation reactor 1 and an oxidation reactor 2;

[0043] Among them, the bottom feed port of oxidation reactor 1 is connected to the feed system, oxidation reactor 1 and oxidation reactor 2 are provided with overflow ports, the liquid product enters the gas-liquid separation system through the overflow ports, and the unreacted air enters the tail gas treatment system from the upper interfaces of oxidation reactor 1 and oxidation reactor 2.

[0044] Preferably, the gas-liquid separation system comprises a gas-liquid separation tank 1, a gas-liquid separation tank 2 and a feed pump 2;

[0045] Among them, the gas-liquid separation tank 1 is connected to the liquid phase product of the oxidation reactor 1, and the bottom feed port is connected to the feed pump to produce the product separately or enter the bottom feed port of the oxidation reactor 2; the gas-liquid separation tank 2 is connected to the liquid phase product of the oxidation reactor 2, and the bottom discharge port produces the oxidized wax product.

[0046] Preferably, the air delivery system comprises an air compressor, a buffer tank and a mass flow meter, which are connected by pipelines and enter oxidation reactor 1 and oxidation reactor 2 respectively through a gas distributor.

[0047] Preferably, the tail gas treatment system comprises a condenser, an oil-water separator and an alkali washing tower.

[0048] Preferably, the heating system is thermal oil heating or electric heating.

[0049] Preferably, a gas distributor is provided at the bottom of the oxidation reactor 1 and the oxidation reactor 2. The gas distributor is provided with a plurality of gas outlet holes with a pore size of 15-40 μm, preferably 25-30 μm, which are symmetrically distributed at the bottom of the oxidation reactor cavity.

[0050] Now the present invention will be further described in detail in conjunction with the preferred embodiments:

[0051] As attached Figure 1 As shown. After the Fischer-Tropsch wax is heated and melted in the raw material tank, it is pumped into the oxidation reactor 1 by the feed pump. At the same time, after the air enters the oxidation reactor 1 from the air compressor, the Fischer-Tropsch wax reacts with the air, and the liquid level reaches the overflow port and enters the gas-liquid separation tank 1. The gas enters the tail gas treatment system from the upper part of the gas-liquid separation tank 1. The liquid is extracted by the feed pump 2 or enters the oxidation reactor 2 to continue to react with the air. After the liquid level reaches the overflow port, it enters the gas-liquid separation tank 2, and the gas enters the tail gas treatment system from the upper part of the gas-liquid separation tank 2. The liquid is discharged as an oxidized wax product. After condensation, the tail gas enters the oil-water separator, the upper oil phase enters the hydrogenation unit, and the lower water phase enters the alkali washing tower and is neutralized and discharged. The raw material tank, the oxidation reactor 1, the oxidation reactor 2, the gas-liquid separation tank 1, and the gas-liquid separation tank 2 are all provided with jackets, which are heated by heat transfer oil or electricity. A plurality of air outlets are provided at the bottom of the oxidation reactor, with an aperture of 15-40 μm, preferably 25-30 μm, symmetrically distributed at the bottom of the oxidation reactor cavity.

[0052] The effective area of ​​the reactor gas distributor is 0.01m2, and the reactor height is 0.1m; 58# Fischer-Tropsch wax to be oxidized is added to the raw material tank and heated to 90°C. After the sample is completely melted, it is transported to the oxidation reactor 1 by the feed pump 1, and the feed amount is controlled to be 50g / h. The temperature of the material in the oxidation reactor 1 is controlled to be 150°C, and the reaction time of the material in the oxidation reactor 1 is controlled to be 2.5h. After passing through the gas-liquid separation tank 1, the oxidized Fischer-Tropsch wax product is obtained and no longer enters the oxidation reactor 2.

[0053] The properties of 58# Fischer-Tropsch wax and oxidized wax are shown in Table 1.

[0054] Table 1

[0055]

[0056] The effective area of ​​the reactor gas distributor is 0.05m2, and the reactor height is 1m; 80# Fischer-Tropsch wax to be oxidized is added to the raw material tank and heated to 110°C. After the sample is completely melted, it is transported to the oxidation reactor 1 by the feed pump 1, and the feed amount is controlled to be 500g / h. The temperature of the material in the oxidation reactor 1 is controlled to be 160°C, and the reaction time of the material in the oxidation reactor 1 is controlled to be 2.5h. The temperature of the second oxidation reactor is 155°C, and the reaction time is 1h to obtain the oxidized Fischer-Tropsch wax product. The properties of 80# Fischer-Tropsch wax and oxidized wax products are shown in Table 2.

[0057] Table 2

[0058]

[0059] The effective area of ​​the reactor gas distributor is 0.2m2, and the reactor height is 1.5m; 105# Fischer-Tropsch wax to be oxidized is added to the raw material tank and heated to 130°C. After the sample is completely melted, it is transported to the oxidation reactor 1 by the feed pump 1, and the feed rate is controlled to be 5kg / h. The temperature of the material in the oxidation reactor 1 is controlled to be 175°C, and the reaction time of the material in the oxidation reactor 1 is controlled to be 2h. The temperature of the second oxidation reactor is 170°C, and the reaction time is 2h to obtain the oxidized Fischer-Tropsch wax product. The properties of 105# Fischer-Tropsch wax and oxidized wax products are shown in Table 3.

[0060] Table 3

[0061]

[0062] The effective area of ​​the reactor gas distributor is 0.6m2, and the reactor height is 2.4m; 115# Fischer-Tropsch wax to be oxidized is added to the raw material tank and heated to 140°C. After the sample is completely melted, it is transported to the oxidation reactor 1 by the feed pump 1, and the feed rate is controlled to be 12.5kg / h. The temperature of the material in the oxidation reactor 1 is controlled to be 175°C, and the reaction time of the material in the oxidation reactor 1 is controlled to be 2.5h. The temperature of the second oxidation reactor is 170°C, and the reaction time is 2.5h to obtain the oxidized Fischer-Tropsch wax product. The properties of 115# Fischer-Tropsch wax and oxidized wax products are shown in Table 4.

[0063] Table 4

[0064]

[0065] All technical features in this embodiment can be freely combined according to actual needs.

[0066] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A Fischer-Tropsch wax oxidation device, characterized in that: It includes feeding system, oxidation reaction system, gas-liquid separation system, air delivery system, tail gas treatment system and heating system; The feeding system is used to heat and melt the Fischer-Tropsch wax and then inject it into the oxidation reaction system; an oxidation reaction system for reacting the Fischer-Tropsch wax with air; The gas-liquid separation system is used to separate gas and liquid. The gas enters the tail gas treatment system for treatment, and the liquid is discharged as the oxidized wax product; an air delivery system for inputting air into the oxidation reactor system; Tail gas treatment system, used to treat the gas separated by the gas-liquid separation system; Heating system, for heating; The feed system comprises a raw material tank and a feed pump 1, wherein the raw material tank is provided with a stirring paddle and connected to the oxidation reaction system through a pipeline. System feed inlet connection; The oxidation reaction system comprises an oxidation reactor 1 and an oxidation reactor 2; The bottom feed port of oxidation reactor 1 is connected to the feed system, and oxidation reactor 1 and oxidation reactor 2 are provided with overflow. The liquid product enters the gas-liquid separation system through the overflow port, and the unreacted air enters the tail gas treatment system from the upper interface of oxidation reactor 1 and oxidation reactor 2; The gas-liquid separation system comprises a gas-liquid separation tank 1, a gas-liquid separation tank 2 and a feed pump 2; Among them, the gas-liquid separation tank 1 is connected to the liquid phase product of the oxidation reactor 1, and the bottom feed port is connected to the feed pump to extract the product separately or enter the bottom feed port of the oxidation reactor 2; the gas-liquid separation tank 2 is connected to the liquid phase product of the oxidation reactor 2, and the bottom discharge port produces the oxidized wax product; The air delivery system comprises an air compressor, a buffer tank and a mass flow meter, which are connected by pipelines and enter oxidation reactor 1 and oxidation reactor 2 respectively through a gas distributor.

2. A Fischer-Tropsch wax oxidation device according to claim 1, characterized in that: The tail gas treatment system comprises a condenser, an oil-water separator and an alkali washing tower.

3. A Fischer-Tropsch wax oxidation device according to claim 1, characterized in that: The heating system is thermal oil heating or electric heating.

4. A Fischer-Tropsch wax oxidation device according to claim 3, characterized in that: A gas distributor is provided at the bottom of the oxidation reactor 1 and the oxidation reactor 2. The gas distributor is provided with a plurality of gas outlet holes with a pore size of 15-40 μm, which are symmetrically distributed at the bottom of the oxidation reactor cavity.

5. A Fischer-Tropsch wax oxidation device according to claim 4, characterized in that: The pore size is 25-30 μm.

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