WO2018094762A1 - Carbon dioxide recovery system for supercritical carbon dioxide dyeing equipment - Google Patents
Carbon dioxide recovery system for supercritical carbon dioxide dyeing equipment Download PDFInfo
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- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- the utility model belongs to the technical field of gas recovery, and particularly relates to a carbon dioxide recovery system for a supercritical carbon dioxide dyeing device.
- the purpose of the utility model is to solve the deficiencies in the prior art, and to provide a reasonable overall structural design, which respectively removes organic impurities in carbon dioxide in the dyeing equipment by hydrolyzing desulfurization, adsorption and drying treatment, respectively.
- a carbon dioxide recovery system that guarantees the quality of carbon dioxide recovery.
- the carbon dioxide recovery system for a supercritical carbon dioxide dyeing device comprises a feed gas separator, a compressor system, a hydrolysis desulfurization tower, a desulfurization water cooler, an alcohol adsorber, a fine desulfurization tower, which are sequentially connected.
- a compressor system is also connected between the recoverers, and the first stage residual cooling unit is connected to the second stage residual cooling unit, and the liquefaction tower and the purification tower are respectively connected to the first stage residual cooling unit.
- a desulfurizing agent alumina is disposed in the hydrolysis desulfurization tower.
- the fine desulfurization tower is provided with an activated carbon and a zinc oxide desulfurizing agent.
- the adsorber is adsorbed by activated carbon.
- the dryer uses a molecular sieve.
- the purification tower is further connected with a reboiler.
- the beneficial effects the overall structure design of the carbon dioxide recovery system of the utility model is reasonable, and the organic impurities in the carbon dioxide are effectively removed by the hydrolysis desulfurization, adsorption and drying treatment, respectively, thereby ensuring the quality of carbon dioxide recovery.
- Figure 1 is a schematic view of the structure of the present invention.
- a carbon dioxide recovery system for a supercritical carbon dioxide dyeing apparatus as shown in Fig. 1, comprising a sequentially connected feed gas separator, a compressor system, a hydrolysis desulfurization tower, a desulfurization water cooler, an alcohol adsorber, a fine desulfurization tower, and a secondary Residual recycler, a precooler, a dryer, an adsorber, a first stage residual heat recovery unit, a liquefier, a liquefaction tower, a purification tower, and a subcooler, and a compression is also connected between the fine desulfurization tower and the secondary residual cooling unit.
- the first-stage residual cooling unit is connected to the second-stage residual cooling unit
- the liquefaction tower and the purification tower are respectively connected to the first-stage residual cooling unit.
- a desulfurizing agent alumina is disposed in the hydrolysis desulfurization tower.
- the fine desulfurization tower is provided with an activated carbon and a zinc oxide desulfurizing agent.
- the adsorber is adsorbed by activated carbon.
- the dryer uses a molecular sieve.
- the purification tower is further connected with a reboiler.
- the utility model adds a trace amount of oxygen to the raw material gas to ensure normal hydrolysis, and the oxygen pressure is 0.3 MPa, the purity is 99.5%, and the usage amount is adjusted according to the flammable gas content in the raw material carbon dioxide tail gas, and the average flow rate is 0.85 Nm 3 /h.
- the auxiliary materials of the system involve a desulfurizing agent, an adsorbent and a desiccant.
- the desulfurizing agent comprises a hydrolysis desulfurizing agent (alumina + special additive), a fine desulfurizing agent (activated carbon + special additive) and a zinc oxide desulfurizing agent; the main component of the adsorbent is activated carbon; the main component of the desiccant is molecular sieve.
- Alumina also known as aluminum oxide, is a white amorphous powder, commonly known as bauxite, corundum. A white solid that is insoluble in water, odorless, tasteless, hard and hard to absorb moisture without deliquescent.
- Amphoteric oxide soluble in inorganic acids and alkaline solutions, almost insoluble in water and non-polar organic solvents; melting point of about 2000 ° C. Used as analytical reagents, dehydration of organic solvents, adsorbents, organic reaction catalysts, abrasives, polishing agents, refractories, etc.
- the zinc oxide desulfurizer is an inorganic solid desulfurizer with active zinc oxide (ZnO) as the main component, large internal surface area and high sulfur capacity. It has the characteristics of high activity, low sulfate, low heavy metal and low specific density. Zinc oxide can also quickly remove hydrogen sulfide at normal temperature to form stable zinc sulfide (ZnS), but requires higher temperature for the decomposition and absorption of organic sulfur.
- ZnO active zinc oxide
- Zinc oxide can also quickly remove hydrogen sulfide at normal temperature to form stable zinc sulfide (ZnS), but requires higher temperature for the decomposition and absorption of organic sulfur.
- Molecular sieve It is a cubic aluminosilicate compound with a cubic lattice structure composed of silicon-aluminum through an oxygen bridge. In the structure, there are many pores with uniform pore size and well-arranged holes with large internal surface area. . In addition, it also contains metal ions with a lower electricity price and a larger ionic radius , and water of a combined state . Since the water molecules are continuously lost after heating, but the crystal skeleton structure is unchanged, many cavities of the same size are formed, and the cavities are connected with a plurality of micropores of the same diameter. These tiny cavities have a uniform diameter and can be compared with the pores.
- molecular sieve Open, that is, the role of "sieving" molecules, it is called molecular sieve.
- molecular sieves are widely used in industries such as chemical, electronics, petrochemical, and natural gas. Molecular sieves have strong moisture absorption capacity and are used for purification and preservation of gases and should be protected from direct exposure to air. Molecular sieves that have been stored for a long period of time and have been hygroscopic should be regenerated before use. Molecular sieves should avoid oil and liquid water.
- the gases dried in industrial production include air, hydrogen, oxygen, nitrogen , argon, and the like.
- the dryer is operated at normal temperature and is regenerated by heating to 350 °C.
- Activated carbon also known as activated carbon black, is a black powder or granular amorphous carbon.
- the main components are oxygen, hydrogen and other elements in addition to carbon.
- 80%-90% or more consists of carbon, which is also activated carbon. It is the reason for the hydrophobic adsorbent.
- Activated carbon is a particle with a mineral crystal molecular structure, which has many pores and large voids, and is arranged in a crystal.
- the activated carbon is obtained by high temperature carbonization and activation, has a large specific surface area, can effectively remove chromaticity and odor, and can remove most organic pollutants and certain inorganic substances.
- the overall structure design of the carbon dioxide recovery system for the supercritical carbon dioxide dyeing equipment of the utility model is reasonable, and the organic impurities in the carbon dioxide are effectively removed by the hydrolysis desulfurization, adsorption and drying treatment, respectively, thereby ensuring the quality of carbon dioxide recovery.
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Abstract
A carbon dioxide recovery system for supercritical carbon dioxide dyeing equipment, comprising a raw gas separator, a compressor system, a hydrolysis and desulfurization tower, a desulfurization water cooler, an alcohol adsorber, a fine desulfurization tower, a second-stage waste cold recovery device, a precooler, a dryer, an adsorber, a first-stage waste cold recovery device, a liquefier, a liquefaction tower, a purification tower, and a subcooler that are connected in sequence. A compressor system is also connected between the fine desulfurization tower and the second-stage waste cold recovery device. The first-stage waste cold recovery device is connected to the second-stage waste cold recovery device. The liquefaction tower and the purification tower are separately connected to the first-stage waste cold recovery device. The carbon dioxide recovery system has a reasonably designed overall structure, and can effectively remove organic impurities in carbon dioxide by means of hydrolysis and desulfurization, adsorption, and drying, thereby ensuring the quality of recovered carbon dioxide.
Description
本实用新型属于气体回收技术领域，具体涉及一种超临界二氧化碳染色设备用二氧化碳回收系统。The utility model belongs to the technical field of gas recovery, and particularly relates to a carbon dioxide recovery system for a supercritical carbon dioxide dyeing device.
传统纺织品染色主要以水为介质，在染色过程中，大量的染料、助剂和表面活性剂等化学物质对环境造成了严重污染，同时也制约着纺织印染行业的可持续发展。2l世纪，对各种生产、加工的低消耗高技术、易控制性、高效性、无污染性以及可循环利用性的要求越来越突出。发展于上世纪末的超临界二氧化碳无水染色技术因其无污染、短流程、高效率等突出特点被认为是一种“绿色、可持续发展技术”而备受青睐。Traditional textile dyeing mainly uses water as the medium. During the dyeing process, a large number of chemical substances such as dyes, auxiliaries and surfactants cause serious pollution to the environment, and also restrict the sustainable development of the textile printing and dyeing industry. In the 21st century, the requirements for low consumption, high technology, easy control, high efficiency, non-polluting and recyclability of various production and processing are becoming more and more prominent. The supercritical carbon dioxide waterless dyeing technology developed at the end of the last century is considered to be a “green, sustainable development technology” because of its non-pollution, short process and high efficiency.
实用新型内容Utility model content
实用新型目的：本实用新型的目的是为了解决现有技术中的不足，提供一种整体结构设计合理，分别通过水解脱硫、吸附以及干燥处理，从而有效去除了染色设备中二氧化碳中的有机杂质，保证了二氧化碳的回收质量的二氧化碳回收系统。Purpose of the utility model: The purpose of the utility model is to solve the deficiencies in the prior art, and to provide a reasonable overall structural design, which respectively removes organic impurities in carbon dioxide in the dyeing equipment by hydrolyzing desulfurization, adsorption and drying treatment, respectively. A carbon dioxide recovery system that guarantees the quality of carbon dioxide recovery.
技术方案：本实用新型所述的一种超临界二氧化碳染色设备用二氧化碳回收系统，包括顺次连接的原料气分离器、压缩机系统、水解脱硫塔、脱硫水冷器、醇吸附器、精脱硫塔、二级余冷回收器、预冷器、干燥器、吸附器、一级余冷回收器、液化器、液化塔、提纯塔以及过冷器，所述精脱硫塔与所述二级余冷回收器之间也连接有压缩机系统，所述一级余冷回收器与二级余冷回收器连接，所述液化塔、提纯塔分别与一级余冷回收器连接。Technical Solution: The carbon dioxide recovery system for a supercritical carbon dioxide dyeing device according to the present invention comprises a feed gas separator, a compressor system, a hydrolysis desulfurization tower, a desulfurization water cooler, an alcohol adsorber, a fine desulfurization tower, which are sequentially connected. a second-stage residual cooling collector, a pre-cooler, a dryer, an adsorber, a first-stage residual cooling recovery unit, a liquefier, a liquefaction tower, a purification tower, and a subcooler, and the fine desulfurization tower and the secondary residual cooling A compressor system is also connected between the recoverers, and the first stage residual cooling unit is connected to the second stage residual cooling unit, and the liquefaction tower and the purification tower are respectively connected to the first stage residual cooling unit.
进一步的，所述水解脱硫塔内设有脱硫剂氧化铝。Further, a desulfurizing agent alumina is disposed in the hydrolysis desulfurization tower.
进一步的，所述精脱硫塔内设有活性炭和氧化锌脱硫剂。Further, the fine desulfurization tower is provided with an activated carbon and a zinc oxide desulfurizing agent.
进一步的，所述吸附器采用活性炭吸附。Further, the adsorber is adsorbed by activated carbon.
进一步的，所述干燥器采用分子筛。Further, the dryer uses a molecular sieve.
进一步的，所述提纯塔还连接有再沸器。Further, the purification tower is further connected with a reboiler.
有益效果：本实用新型的二氧化碳回收系统整体结构设计合理，分别通过水解脱硫、吸附以及干燥处理，从而有效去除了二氧化碳中的有机杂质，保证了二氧化碳的回收质量。The beneficial effects: the overall structure design of the carbon dioxide recovery system of the utility model is reasonable, and the organic impurities in the carbon dioxide are effectively removed by the hydrolysis desulfurization, adsorption and drying treatment, respectively, thereby ensuring the quality of carbon dioxide recovery.
图1为本实用新型的结构示意图。Figure 1 is a schematic view of the structure of the present invention.
如图1所示的一种超临界二氧化碳染色设备用二氧化碳回收系统，包括顺次连接的原料气分离器、压缩机系统、水解脱硫塔、脱硫水冷器、醇吸附器、精脱硫塔、二级余冷回收器、
预冷器、干燥器、吸附器、一级余冷回收器、液化器、液化塔、提纯塔以及过冷器，所述精脱硫塔与所述二级余冷回收器之间也连接有压缩机系统，所述一级余冷回收器与二级余冷回收器连接，所述液化塔、提纯塔分别与一级余冷回收器连接。A carbon dioxide recovery system for a supercritical carbon dioxide dyeing apparatus as shown in Fig. 1, comprising a sequentially connected feed gas separator, a compressor system, a hydrolysis desulfurization tower, a desulfurization water cooler, an alcohol adsorber, a fine desulfurization tower, and a secondary Residual recycler,
a precooler, a dryer, an adsorber, a first stage residual heat recovery unit, a liquefier, a liquefaction tower, a purification tower, and a subcooler, and a compression is also connected between the fine desulfurization tower and the secondary residual cooling unit. In the machine system, the first-stage residual cooling unit is connected to the second-stage residual cooling unit, and the liquefaction tower and the purification tower are respectively connected to the first-stage residual cooling unit.
作为上述技术方案的进一步优化：As a further optimization of the above technical solutions:
进一步的，所述水解脱硫塔内设有脱硫剂氧化铝。Further, a desulfurizing agent alumina is disposed in the hydrolysis desulfurization tower.
进一步的，所述精脱硫塔内设有活性炭和氧化锌脱硫剂。Further, the fine desulfurization tower is provided with an activated carbon and a zinc oxide desulfurizing agent.
进一步的，所述吸附器采用活性炭吸附。Further, the adsorber is adsorbed by activated carbon.
进一步的，所述干燥器采用分子筛。Further, the dryer uses a molecular sieve.
进一步的，所述提纯塔还连接有再沸器。Further, the purification tower is further connected with a reboiler.
本实用新型原料气中加微量氧保证水解能正常进行，使用氧气压力为0.3MPa，纯度99.5％，使用量依原料二氧化碳尾气中的可燃气体含量调整，平均流量为0.85Nm3/h。The utility model adds a trace amount of oxygen to the raw material gas to ensure normal hydrolysis, and the oxygen pressure is 0.3 MPa, the purity is 99.5%, and the usage amount is adjusted according to the flammable gas content in the raw material carbon dioxide tail gas, and the average flow rate is 0.85 Nm 3 /h.
本系统的辅料涉及脱硫剂、吸附剂和干燥剂。其中脱硫剂含水解脱硫剂(氧化铝+特殊添加剂)、精脱硫剂(活性炭+特殊添加剂)和氧化锌脱硫剂；吸附剂的主要成分是活性炭；干燥剂的主要成分是分子筛。The auxiliary materials of the system involve a desulfurizing agent, an adsorbent and a desiccant. The desulfurizing agent comprises a hydrolysis desulfurizing agent (alumina + special additive), a fine desulfurizing agent (activated carbon + special additive) and a zinc oxide desulfurizing agent; the main component of the adsorbent is activated carbon; the main component of the desiccant is molecular sieve.
氧化铝：又称三氧化二铝，是一种白色无定性粉状物，俗称矾土、刚玉。难溶于水的白色固体，无臭、无味、质级硬，易吸潮而不潮解。两性氧化物，能溶于无机酸和碱性溶液中，几乎不溶于水及非极性有机溶剂；熔点约2000℃。用作分析试剂、有机溶剂的脱水、吸附剂、有机反应催化剂、研磨剂、抛光剂、耐火材料等。Alumina: also known as aluminum oxide, is a white amorphous powder, commonly known as bauxite, corundum. A white solid that is insoluble in water, odorless, tasteless, hard and hard to absorb moisture without deliquescent. Amphoteric oxide, soluble in inorganic acids and alkaline solutions, almost insoluble in water and non-polar organic solvents; melting point of about 2000 ° C. Used as analytical reagents, dehydration of organic solvents, adsorbents, organic reaction catalysts, abrasives, polishing agents, refractories, etc.
氧化锌脱硫剂是以活性氧化锌(ZnO)为主要成分，内表面积较大、硫容较高的一种无机固体脱硫剂。具有高活性、低硫酸根、低重金属、低堆比密度的特点。在常温下氧化锌也能快速脱除硫化氢，生成性质稳定的硫化锌(ZnS)，但对有机硫的分解吸收却需要较高的温度。The zinc oxide desulfurizer is an inorganic solid desulfurizer with active zinc oxide (ZnO) as the main component, large internal surface area and high sulfur capacity. It has the characteristics of high activity, low sulfate, low heavy metal and low specific density. Zinc oxide can also quickly remove hydrogen sulfide at normal temperature to form stable zinc sulfide (ZnS), but requires higher temperature for the decomposition and absorption of organic sulfur.
分子筛：是一种具有立方晶格的硅铝酸盐化合物，主要由硅铝通过氧桥连接组成空旷的骨架结构，在结构中有很多孔径均匀的孔道和排列整齐、内表面积很大的空穴。此外还含有电价较低而离子半径较大的金属离子和化合态的水。由于水分子在加热后连续地失去，但晶体骨架结构不变，形成了许多大小相同的空腔，空腔又有许多直径相同的微孔相连，这些微小的孔穴直径大小均匀，能把比孔道直径小的分子吸附到孔穴的内部中来，而把比孔道大得分子排斥在外，因而能把形状直径大小不同的分子、极性程度不同的分子、沸点不同的分子、饱和程度不同的分子分离开来，即具有“筛分”分子的作用，故称为分子筛。目前分子筛在化工、电子、石油化工、天然气等工业中广泛使用。分子筛吸湿能力极强、用于气体的纯化处理、保存时应避免直接暴露在空气中。存放时间较长并已经吸湿的分子筛使用前应进行再生。
分子筛忌油和液态水，使用时应尽量避免与油及液态水接触。工业生产中干燥处理的气体有空气、氢气、氧气、氮气、氩气等。用两只吸附干燥器并联，一只工作，同时另一只可以进行再生处理。相互交替工作和再生，以保证设备连续运行。干燥器在常温下工作，在加温至350℃下冲气再生。Molecular sieve: It is a cubic aluminosilicate compound with a cubic lattice structure composed of silicon-aluminum through an oxygen bridge. In the structure, there are many pores with uniform pore size and well-arranged holes with large internal surface area. . In addition, it also contains metal ions with a lower electricity price and a larger ionic radius , and water of a combined state . Since the water molecules are continuously lost after heating, but the crystal skeleton structure is unchanged, many cavities of the same size are formed, and the cavities are connected with a plurality of micropores of the same diameter. These tiny cavities have a uniform diameter and can be compared with the pores. The molecules with small diameters are adsorbed into the interior of the pores, and the molecules larger than the pores are repelled. Therefore, molecules with different diameters and sizes, molecules with different polarities, molecules with different boiling points, and molecules with different degrees of saturation can be separated. Open, that is, the role of "sieving" molecules, it is called molecular sieve. At present, molecular sieves are widely used in industries such as chemical, electronics, petrochemical, and natural gas. Molecular sieves have strong moisture absorption capacity and are used for purification and preservation of gases and should be protected from direct exposure to air. Molecular sieves that have been stored for a long period of time and have been hygroscopic should be regenerated before use. Molecular sieves should avoid oil and liquid water. When using, avoid contact with oil and liquid water. The gases dried in industrial production include air, hydrogen, oxygen, nitrogen , argon, and the like. Use two adsorption dryers in parallel, one for work, and the other for regeneration. Work alternately and regenerate to ensure continuous operation of the equipment. The dryer is operated at normal temperature and is regenerated by heating to 350 °C.
活性炭：又称活性炭黑，是黑色粉末状或颗粒状的无定形碳，主要成分除了碳以外还有氧、氢等元素，在元素组成方面，80％-90％以上由碳组成，这也是活性炭为疏水性吸附剂的原因。活性炭是具有矿晶分子结构的颗粒，其孔多、空隙大，呈晶体排列。活性炭经高温炭化和活化制得，具有巨大的比表面积，能有效地去除色度、臭味，可去除大多数有机污染物和某些无机物。Activated carbon: also known as activated carbon black, is a black powder or granular amorphous carbon. The main components are oxygen, hydrogen and other elements in addition to carbon. In terms of elemental composition, 80%-90% or more consists of carbon, which is also activated carbon. It is the reason for the hydrophobic adsorbent. Activated carbon is a particle with a mineral crystal molecular structure, which has many pores and large voids, and is arranged in a crystal. The activated carbon is obtained by high temperature carbonization and activation, has a large specific surface area, can effectively remove chromaticity and odor, and can remove most organic pollutants and certain inorganic substances.
本实用新型的超临界二氧化碳染色设备用二氧化碳回收系统整体结构设计合理，分别通过水解脱硫、吸附以及干燥处理，从而有效去除了二氧化碳中的有机杂质，保证了二氧化碳的回收质量。The overall structure design of the carbon dioxide recovery system for the supercritical carbon dioxide dyeing equipment of the utility model is reasonable, and the organic impurities in the carbon dioxide are effectively removed by the hydrolysis desulfurization, adsorption and drying treatment, respectively, thereby ensuring the quality of carbon dioxide recovery.
以上所述，仅是本实用新型的较佳实施例而已，并非对本实用新型作任何形式上的限制，虽然本实用新型已以较佳实施例揭露如上，然而并非用以限定本实用新型，任何熟悉本专业的技术人员，在不脱离本实用新型技术方案范围内，当可利用上述揭示的技术内容作出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本实用新型技术方案的内容，依据本实用新型的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本实用新型技术方案的范围内。
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been disclosed above in the preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can make some modifications or modifications to equivalent embodiments when using the above-disclosed technical contents without departing from the technical solutions of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments in accordance with the technical spirit of the present invention are still within the scope of the technical solutions of the present invention.
Claims (6)
- 一种超临界二氧化碳染色设备用二氧化碳回收系统，其特征在于：包括顺次连接的原料气分离器、压缩机系统、水解脱硫塔、脱硫水冷器、醇吸附器、精脱硫塔、二级余冷回收器、预冷器、干燥器、吸附器、一级余冷回收器、液化器、液化塔、提纯塔以及过冷器，所述精脱硫塔与所述二级余冷回收器之间也连接有压缩机系统，所述一级余冷回收器与二级余冷回收器连接，所述液化塔、提纯塔分别与一级余冷回收器连接。A carbon dioxide recovery system for supercritical carbon dioxide dyeing equipment, comprising: a raw material gas separator connected in sequence, a compressor system, a hydrolysis desulfurization tower, a desulfurization water cooler, an alcohol adsorber, a fine desulfurization tower, and a secondary residual cooling a recycler, a precooler, a dryer, an adsorber, a first stage residual heat recovery unit, a liquefier, a liquefaction tower, a purification tower, and a subcooler, and the fine desulfurization tower and the secondary residual cooling unit are also A compressor system is connected, and the first stage residual cooling unit is connected to the second stage residual cooling unit, and the liquefaction tower and the purification tower are respectively connected to the first stage residual cooling unit.
- 根据权利要求1所述的一种超临界二氧化碳染色设备用二氧化碳回收系统，其特征在于：所述水解脱硫塔内设有脱硫剂氧化铝。The carbon dioxide recovery system for a supercritical carbon dioxide dyeing apparatus according to claim 1, wherein the hydrolysis desulfurization tower is provided with a desulfurizing agent alumina.
- 根据权利要求1所述的一种超临界二氧化碳染色设备用二氧化碳回收系统，其特征在于：所述精脱硫塔内设有活性炭和氧化锌脱硫剂。The carbon dioxide recovery system for a supercritical carbon dioxide dyeing apparatus according to claim 1, wherein the fine desulfurization tower is provided with an activated carbon and a zinc oxide desulfurizing agent.
- 根据权利要求1所述的一种超临界二氧化碳染色设备用二氧化碳回收系统，其特征在于：所述吸附器采用活性炭吸附。A carbon dioxide recovery system for a supercritical carbon dioxide dyeing apparatus according to claim 1, wherein said adsorber is adsorbed by activated carbon.
- 根据权利要求1所述的一种超临界二氧化碳染色设备用二氧化碳回收系统，其特征在于：所述干燥器采用分子筛。A carbon dioxide recovery system for a supercritical carbon dioxide dyeing apparatus according to claim 1, wherein said dryer uses a molecular sieve.
- 根据权利要求1所述的一种超临界二氧化碳染色设备用二氧化碳回收系统，其特征在于：所述提纯塔还连接有再沸器。 A carbon dioxide recovery system for a supercritical carbon dioxide dyeing apparatus according to claim 1, wherein said purification tower is further connected to a reboiler.
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