CN206950931U - The parsing of by-product hydrochloric acid and circulation and stress device in VCM synthesis - Google Patents
The parsing of by-product hydrochloric acid and circulation and stress device in VCM synthesis Download PDFInfo
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 230000004087 circulation Effects 0.000 title claims abstract description 24
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 20
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 20
- 239000006227 byproduct Substances 0.000 title claims abstract description 17
- 239000002253 acid Substances 0.000 claims abstract description 187
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims abstract description 61
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000007789 gas Substances 0.000 claims abstract description 51
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000006096 absorbing agent Substances 0.000 claims abstract description 25
- 239000011552 falling film Substances 0.000 claims abstract description 25
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 239000002826 coolant Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000012495 reaction gas Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 2
- 238000010521 absorption reaction Methods 0.000 claims 1
- 239000003518 caustics Substances 0.000 claims 1
- 238000005660 chlorination reaction Methods 0.000 claims 1
- 239000012266 salt solution Substances 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 24
- 238000003795 desorption Methods 0.000 abstract description 18
- 238000000034 method Methods 0.000 abstract description 14
- 239000012141 concentrate Substances 0.000 abstract 1
- 230000035882 stress Effects 0.000 abstract 1
- 230000001839 systemic circulation Effects 0.000 abstract 1
- 238000005406 washing Methods 0.000 description 39
- 239000000243 solution Substances 0.000 description 8
- 239000008235 industrial water Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229960002523 mercuric chloride Drugs 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- LWJROJCJINYWOX-UHFFFAOYSA-L mercury dichloride Chemical compound Cl[Hg]Cl LWJROJCJINYWOX-UHFFFAOYSA-L 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Treating Waste Gases (AREA)
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Abstract
Description
技术领域technical field
本实用新型涉及化工行业生产回收装置技术领域，更具体地，涉及一种氯乙烯合成中副产物盐酸的解析和循环回收装置。The utility model relates to the technical field of production recovery devices in the chemical industry, in particular to a device for analyzing and recycling hydrochloric acid, a by-product in vinyl chloride synthesis.
背景技术Background technique
在采用电石法合成氯乙烯中，原料气氯化氢和乙炔进入混合器充分混合后，混合气经过两级石墨冷凝至-14～-17℃，并除去其中大部分的水分，然后通过酸雾过滤器，除去少量水分，最后再经过预热器预热后送入转化器，在氯化汞触媒的作用下，发生加成放热反应合成氯乙烯气体。In the synthesis of vinyl chloride by the calcium carbide method, the raw material gas hydrogen chloride and acetylene enter the mixer to be fully mixed, and the mixed gas is condensed to -14~-17°C through two-stage graphite, and most of the water is removed, and then passed through the acid mist filter , to remove a small amount of water, and finally sent to the converter after being preheated by the preheater. Under the action of the mercuric chloride catalyst, an addition exothermic reaction occurs to synthesize vinyl chloride gas.
为了提高乙炔的转化率，最常用的经济可行的办法是氯化氢气体稍微过量，在氯乙烯合成过程中氯化氢气体与乙炔气体按摩尔比为(1. 05～1.10)：1。然而，由于氯化氢气体过量，反应后粗氯乙烯气体经过降膜吸收器和水洗塔除去大部分过量的氯化氢，产生质量分数约31％的浓盐酸，由于这部分浓盐酸在反应过程中带入了微量汞、铁等杂质，只能在要求较低的场合应用。In order to increase the conversion rate of acetylene, the most commonly used and economically feasible method is a slight excess of hydrogen chloride gas, and the molar ratio of hydrogen chloride gas to acetylene gas is (1.05-1.10):1 in the synthesis process of vinyl chloride. However, due to the excessive hydrogen chloride gas, the crude vinyl chloride gas after the reaction passes through the falling film absorber and the water washing tower to remove most of the excess hydrogen chloride, and produces concentrated hydrochloric acid with a mass fraction of about 31%. Trace impurities such as mercury and iron can only be used in occasions with lower requirements.
针对上述情况，很多企业对副产盐酸进行解析，从而达到回收其中的氯化氢气体的目的。然而，深度解析工艺需增加的设备投资较大，且解析过程耗能高，经济适用性差；而常规解析工艺又不能彻底利用稀酸，从而导致稀酸的处理费用较高，解析效果不理想。In view of the above situation, many enterprises analyze the by-product hydrochloric acid, so as to achieve the purpose of recovering the hydrogen chloride gas in it. However, the deep analysis process requires a large investment in equipment, and the analysis process consumes high energy and poor economic applicability; while the conventional analysis process cannot fully utilize dilute acid, resulting in high processing costs for dilute acid and unsatisfactory analysis results.
综上所述，在氯乙烯合成中副产物盐酸的解析和循环回收工艺和装置的研究和开发过程中，如何克服现有技术中所存在的缺陷，提供一种结构简单、设计科学合理、解析和回收彻底、解析和回收过程耗能低且具有较强经济实用性的循环回收装置是目前亟待解决的关键问题。In summary, how to overcome the defects in the prior art and provide a simple structure, scientific and reasonable design, analytical A recycling device with thorough recovery, low energy consumption in the analysis and recovery process and strong economical practicability is the key problem to be solved urgently.
发明内容Contents of the invention
针对现有技术存在的不足，本实用新型提供了一种氯乙烯合成中副产物盐酸的解析和循环回收装置。Aiming at the deficiencies in the prior art, the utility model provides a device for analyzing and recycling hydrochloric acid, a by-product in vinyl chloride synthesis.
本实用新型采用如下技术方案：The utility model adopts the following technical solutions:
一种氯乙烯合成中副产物盐酸的解析和循环回收装置，包括降膜吸收器、浓酸槽、水洗塔、稀酸槽、稀酸循环泵、稀酸冷却器、浓酸泵、浓酸预热器、解析塔、氯化氢冷凝器，所述降膜吸收器的气体入口、气体出口和出料口分别与冷却后的氯乙烯反应气、水洗塔的气体入口和浓酸槽连接，所述浓酸泵的进口和出口分别与浓酸槽和浓酸预热器的浓酸入口连接，所述浓酸预热器的预热浓酸出口、解析后稀酸入口和预冷后稀酸出口分别与解析塔的预热后浓酸入口和解析后稀酸出口、以及稀酸冷却器的入口连接，所述氯化氢冷凝器的入口和出口分别与解析塔的解析后气体出口和氯化氢气体回收总管连接，所述稀酸槽分别与稀酸冷却器的出口、水洗塔的副产稀酸出口和稀酸循环泵入口连接，所述稀酸循环泵的出口与降膜吸收器的循环液入口和水洗塔的稀酸入口连接，所述水洗塔的气体出口与去碱洗塔连接。A device for analyzing and recycling hydrochloric acid by-product in vinyl chloride synthesis, including falling film absorber, concentrated acid tank, water washing tower, dilute acid tank, dilute acid circulation pump, dilute acid cooler, concentrated acid pump, concentrated acid pre Heater, desorption tower, hydrogen chloride condenser, the gas inlet, gas outlet and discharge port of the falling film absorber are respectively connected with the cooled vinyl chloride reaction gas, the gas inlet of the water washing tower and the concentrated acid tank, the concentrated acid The inlet and outlet of the acid pump are respectively connected with the concentrated acid tank and the concentrated acid inlet of the concentrated acid preheater. It is connected with the inlet of concentrated acid after preheating of the desorption tower, the outlet of dilute acid after desorption, and the inlet of the dilute acid cooler, and the inlet and outlet of the hydrogen chloride condenser are respectively connected with the desorption gas outlet of the desorption tower and the hydrogen chloride gas recovery main pipe , the dilute acid tank is respectively connected with the outlet of the dilute acid cooler, the by-product dilute acid outlet of the water washing tower and the inlet of the dilute acid circulation pump, and the outlet of the dilute acid circulation pump is connected with the circulating liquid inlet of the falling film absorber and the water washing The dilute acid inlet of the tower is connected, and the gas outlet of the water washing tower is connected with the alkali-removing washing tower.
在上述技术方案中，所述解析和循环回收装置还包括再沸器，所述再沸器的入口和出口分别与解析塔的解析后稀酸出口和再沸加热后的稀盐酸蒸汽入口连接。In the above technical solution, the analysis and recycling recovery device further includes a reboiler, and the inlet and outlet of the reboiler are respectively connected to the outlet of the resolved dilute acid of the analysis tower and the inlet of the dilute hydrochloric acid vapor after reboiling and heating.
在上述技术方案中，所述解析和循环回收装置还包括水洗塔进酸冷却器，所述水洗塔进酸冷却器的入口与稀酸循环泵的出口连接，所述水洗塔进酸冷却器的出口与降膜吸收器的循环液入口和水洗塔的稀酸入口连接。In the above technical scheme, the analysis and recycling recovery device also includes a water-washing tower inlet acid cooler, the inlet of the water-washing tower acid cooler is connected with the outlet of the dilute acid circulation pump, and the water-washing tower inlet acid cooler The outlet is connected with the circulating liquid inlet of the falling film absorber and the dilute acid inlet of the water washing tower.
在上述技术方案中，所述解析和循环回收装置还包括稀酸泵，所述稀酸泵的入口和出口分别与稀酸冷却器的出口和稀酸槽连接。In the above technical solution, the analysis and circulation recovery device further includes a dilute acid pump, the inlet and outlet of the dilute acid pump are respectively connected to the outlet of the dilute acid cooler and the dilute acid tank.
在上述技术方案中，所述稀酸冷却器为二级稀酸冷却器。In the above technical solution, the dilute acid cooler is a secondary dilute acid cooler.
进一步地，在上述技术方案中，所述稀酸冷却器包括第一级稀酸冷却器和第二级稀酸冷却器，所述第一级稀酸冷却器的冷却介质为循环水，所述第二级稀酸冷却器的冷却介质为7℃的循环水。Further, in the above technical solution, the dilute acid cooler includes a first-stage dilute acid cooler and a second-stage dilute acid cooler, the cooling medium of the first-stage dilute acid cooler is circulating water, and the The cooling medium of the second-stage dilute acid cooler is circulating water at 7°C.
在上述技术方案中，所述氯化氢冷凝器为二级氯化氢冷凝器。In the above technical scheme, the hydrogen chloride condenser is a secondary hydrogen chloride condenser.
进一步地，在上述技术方案中，所述氯化氢冷凝器包括第一级氯化氢冷凝器和第二级氯化氢冷凝器，所述第一级氯化氢冷凝器的冷凝介质为7℃的循环水，所述第二级氯化氢冷凝器的冷凝介质为-35℃的冷冻盐水。Further, in the above technical solution, the hydrogen chloride condenser includes a first-stage hydrogen chloride condenser and a second-stage hydrogen chloride condenser, the condensing medium of the first-stage hydrogen chloride condenser is circulating water at 7°C, and the first-stage hydrogen chloride condenser The condensing medium of the secondary hydrogen chloride condenser is frozen brine at -35°C.
在上述技术方案中，所述水洗塔的稀酸入口还连接设置有工业水补水管。In the above technical solution, the dilute acid inlet of the water washing tower is also connected with an industrial water supply pipe.
在上述技术方案中，所述水洗塔为组合式水洗塔，包括从上而下设置的泡罩塔板和填料塔。In the above technical solution, the water washing tower is a combined water washing tower, comprising bubble cap trays and packed towers arranged from top to bottom.
本实用新型具有以下有益效果：The utility model has the following beneficial effects:
(1)本实用新型所设计的解析和循环回收装置通过降膜吸收器和水洗塔的共同作用，一方面能完全除去粗氯乙烯合成气中的氯化氢气体，并将降膜吸收器底部产生的浓酸经预热后进入解析塔解析，回收利用氯化氢气体并用于氯乙烯气体的合成中，另一方面，可将水洗塔产生的稀酸再次进入降膜吸收器进行下一次解析和循环回收过程；通过利用解析塔与浓酸预热器和再沸器的组合，一方面预热后浓酸的解析效果好，另一方面，通过再沸器的加热处理后再进入解析塔，进一步提高了其解析效果；(1) The analysis and recycling recovery device designed by the utility model can completely remove the hydrogen chloride gas in the crude vinyl chloride synthesis gas on the one hand through the joint action of the falling film absorber and the water washing tower, and remove the hydrogen chloride gas produced at the bottom of the falling film absorber. After preheating, the concentrated acid enters the desorption tower for analysis, recycles hydrogen chloride gas and uses it in the synthesis of vinyl chloride gas. On the other hand, the dilute acid produced by the water washing tower can be re-entered into the falling film absorber for the next analysis and recycling process. ; By utilizing the combination of desorption tower, concentrated acid preheater and reboiler, on the one hand, the desorption effect of concentrated acid after preheating is good; its analytical effect;
(2)本实用新型所设计的解析和循环回收装置通过将浓酸槽中的浓酸在进入解析塔之前与解析塔解析后的85℃的稀酸在浓酸预热器中进行换热，合理利用热能，从而大大降低了解析过程的耗能；(2) The analysis and recycling recovery device designed by the utility model exchange heat in the concentrated acid preheater with the concentrated acid in the concentrated acid tank before entering the analysis tower and the 85 ° C dilute acid after analysis in the analysis tower. Reasonable use of thermal energy, thus greatly reducing the energy consumption of the analysis process;
(3)本实用新型所设计的解析和循环回收装置通过在水洗塔稀酸入口补入少量工业水，并从稀酸槽中排出与补入工业水同量的稀酸，用于中和碱洗塔中排出的废渐，保证稀酸循环的正常运行，从而保证了副产稀酸的彻底解析和循环回收利用，并可将回收的氯化氢气体并用于氯乙烯气体的合成中，经济实用性强，应用前景广阔；(3) The analysis and recycling device designed by the utility model is used to neutralize the alkali by adding a small amount of industrial water at the inlet of the diluted acid of the washing tower, and discharging the same amount of diluted acid as the industrial water added from the diluted acid tank. The waste gas discharged from the washing tower ensures the normal operation of the dilute acid cycle, thereby ensuring the thorough analysis and recycling of by-product dilute acid, and the recovered hydrogen chloride gas can be used in the synthesis of vinyl chloride gas, which is economical and practical Strong, broad application prospects;
(4)本实用新型所设计的解析和循环回收装置结构简单、设计科学合理、设备投资小、解析过程可控且处理费用低，具有较强的市场竞争力。(4) The analysis and recycling device designed by the utility model has simple structure, scientific and reasonable design, small equipment investment, controllable analysis process and low processing cost, and has strong market competitiveness.
附图说明Description of drawings
图1为根据本实用新型实施例一所提供的一种氯乙烯合成中副产物盐酸的解析和循环回收装置的结构示意图；Fig. 1 is a schematic structural view of a device for analyzing and recycling hydrochloric acid, a by-product in the synthesis of vinyl chloride, provided according to Embodiment 1 of the present utility model;
图2为根据本实用新型实施例二所提供的一种氯乙烯合成中副产物盐酸的解析和循环回收装置的结构示意图；Fig. 2 is a schematic structural diagram of a device for analyzing and recycling hydrochloric acid, a by-product in the synthesis of vinyl chloride, provided according to Embodiment 2 of the present utility model;
图中：降膜吸收器1，浓酸槽2，水洗塔3，稀酸槽4，稀酸循环泵5，稀酸冷却器6(第一级稀酸冷却器61，第二级稀酸冷却器62)，浓酸泵7，浓酸预热器8，解析塔9，氯化氢冷凝器10(第一级氯化氢冷凝器101，第二级氯化氢冷凝器102)，再沸器11，稀酸泵12，水洗塔进酸冷却器13。In the figure: falling film absorber 1, concentrated acid tank 2, water washing tower 3, dilute acid tank 4, dilute acid circulation pump 5, dilute acid cooler 6 (first dilute acid cooler 61, second dilute acid cooling device 62), concentrated acid pump 7, concentrated acid preheater 8, desorption tower 9, hydrogen chloride condenser 10 (first stage hydrogen chloride condenser 101, second stage hydrogen chloride condenser 102), reboiler 11, dilute acid pump 12. The water washing tower enters the acid cooler 13.
具体实施方式Detailed ways
下面结合具体实施例，对本实用新型的具体实施方式作进一步详细描述。以下实施例仅用于说明本实用新型，并不用来限制本实用新型的具体保护范围。Below in conjunction with specific examples, the specific implementation of the present utility model will be further described in detail. The following examples are only used to illustrate the utility model, and are not intended to limit the specific protection scope of the utility model.
在本实用新型的描述中，除非另有说明，“多个”的含义是两个或两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”、“前端”、“后端”、“头部”、“尾部”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本实用新型和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对木实用新型的限制。In the description of the present utility model, unless otherwise specified, the meaning of "multiple" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer" ", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the utility model.
在本实用新型的描述中，需要说明的是，除非另有明确的规定和限定，术语“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本实用新型中的具体含义。In the description of the present utility model, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Integratively connected; either directly or indirectly through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.
实施例一Embodiment one
如图1所示，本实用新型实施例一所提供的一种氯乙烯合成中副产物盐酸的解析和循环回收装置，包括降膜吸收器1、浓酸槽2、水洗塔3、稀酸槽4、稀酸循环泵5、稀酸冷却器6、浓酸泵7、浓酸预热器 8、解析塔9、氯化氢冷凝器10。As shown in Fig. 1, a kind of analysis and recycling device of by-product hydrochloric acid in the synthesis of vinyl chloride provided by Embodiment 1 of the utility model includes falling film absorber 1, concentrated acid tank 2, water washing tower 3, dilute acid tank 4. Dilute acid circulation pump 5, dilute acid cooler 6, concentrated acid pump 7, concentrated acid preheater 8, desorption tower 9, hydrogen chloride condenser 10.
降膜吸收器1的气体入口与冷却后的氯乙烯反应气管道连接，其气体出口与水洗塔3的气体入口连接，其出料口通过管道与浓酸槽2 连接；浓酸泵7的进口与浓酸槽2连接，出口与浓酸预热器8的浓酸入口连接；浓酸预热器8的预热浓酸出口与解析塔9的预热后浓酸入口连接，解析后稀酸入口与解析塔9的解析后稀酸出口连接，预冷后稀酸出口与稀酸冷却器6的入口连接；解析塔9的解析后气体出口与氯化氢冷凝器10的入口连接；氯化氢冷凝器10的出口与氯化氢气体回收总管连接；稀酸冷却器6的出口通过管道与稀酸槽4连接；水洗塔3的副产稀酸出口通过管道与稀酸槽4连接；稀酸循环泵5的进口与稀酸槽4连接，出口通过三通和管道同时与降膜吸收器1的循环液入口和水洗塔3的稀酸入口连接；水洗塔3的气体出口与去碱洗塔连接。The gas inlet of the falling film absorber 1 is connected with the cooled vinyl chloride reaction gas pipeline, its gas outlet is connected with the gas inlet of the water washing tower 3, and its discharge port is connected with the concentrated acid tank 2 through a pipeline; the inlet of the concentrated acid pump 7 It is connected with the concentrated acid tank 2, and the outlet is connected with the concentrated acid inlet of the concentrated acid preheater 8; the preheated concentrated acid outlet of the concentrated acid preheater 8 is connected with the preheated concentrated acid inlet of the analysis tower 9, and the diluted acid after analysis The inlet is connected with the outlet of the dilute acid after the analysis of the analysis tower 9, and the outlet of the dilute acid after precooling is connected with the inlet of the dilute acid cooler 6; the gas outlet after the analysis of the analysis tower 9 is connected with the inlet of the hydrogen chloride condenser 10; The outlet of the hydrogen chloride gas recovery main pipe is connected; the outlet of the dilute acid cooler 6 is connected with the dilute acid tank 4 through a pipeline; the by-product dilute acid outlet of the water washing tower 3 is connected with the dilute acid tank 4 through a pipeline; the inlet of the dilute acid circulation pump 5 It is connected to the dilute acid tank 4, and the outlet is connected to the circulating liquid inlet of the falling film absorber 1 and the dilute acid inlet of the water washing tower 3 through a tee and a pipeline; the gas outlet of the water washing tower 3 is connected to the alkali-removing tower.
本实用新型实施例一所提供的一种氯乙烯合成中副产物盐酸的解析和循环回收装置的工作过程如下：含有过量氯化氢的冷却后的氯乙烯合成气经过降膜吸收器1，与稀酸槽4过来的稀酸进行同向传热传质，除去大部分氯化氢气体，随后氯乙烯合成气经过水洗塔3进一步除去氯化氢气体后，从水洗塔3气体出口出塔，进入碱洗塔；降膜吸收器1出料口排出浓度约为31wt％的浓盐酸，借位差进入浓酸槽2，经浓酸泵7打到浓酸预热器8预热后进入解析塔9，解析塔9内从浓酸脱吸出来的氯化氢气体从解析塔9的解析后气体出口出塔，经氯化氢冷凝器10冷凝器后进入HCl回收总管回收后再次利用；从解析塔9解析后稀酸出口排出的浓度约为22wt％的85℃的稀酸与在进入解析塔之前的浓酸在浓酸预热器8中进行换热，然后再进入稀酸冷却器6冷却后进入稀酸槽4；稀酸槽4内的稀酸经稀酸循环泵5通过管道，一部分进入降膜吸收器1用于提浓，另一部分打入水洗塔3用于吸收粗氯乙烯气体中剩余的氯化氢气体；进入水洗塔3内的稀酸从水洗塔3的副产稀酸出口排出，进入稀酸槽4，从而最终完成了稀酸大循环。The working process of the analysis and recycling device for the by-product hydrochloric acid in the synthesis of vinyl chloride provided by Embodiment 1 of the utility model is as follows: the cooled vinyl chloride synthesis gas containing excess hydrogen chloride passes through the falling film absorber 1, and is mixed with dilute acid The dilute acid coming from the tank 4 performs heat and mass transfer in the same direction to remove most of the hydrogen chloride gas, and then the vinyl chloride synthesis gas passes through the water washing tower 3 to further remove the hydrogen chloride gas, and then exits the tower from the gas outlet of the water washing tower 3 and enters the alkali washing tower; Concentrated hydrochloric acid with a concentration of about 31wt% is discharged from the discharge port of the membrane absorber 1, and enters the concentrated acid tank 2 by means of the potential difference, and is pumped to the concentrated acid preheater 8 by the concentrated acid pump 7 and then enters the desorption tower 9, and the desorption tower 9 The hydrogen chloride gas desorbed from the concentrated acid is discharged from the gas outlet of the desorption tower 9 from the gas outlet of the desorption tower 9, and enters the HCl recovery main pipe after passing through the hydrogen chloride condenser 10 condenser to recycle; The dilute acid at 85°C with a concentration of about 22wt% exchanges heat with the concentrated acid before entering the desorption tower in the concentrated acid preheater 8, and then enters the dilute acid cooler 6 to cool down and then enters the dilute acid tank 4; dilute acid The dilute acid in the tank 4 passes through the pipeline through the dilute acid circulation pump 5, part of it enters the falling film absorber 1 for concentration, and the other part enters the water washing tower 3 to absorb the remaining hydrogen chloride gas in the crude vinyl chloride gas; enters the water washing tower The dilute acid in 3 is discharged from the by-product dilute acid outlet of the water washing tower 3 and enters the dilute acid tank 4, thereby finally completing the dilute acid cycle.
从稀酸槽4排出来稀酸进入降膜吸收器1的流量和进入水洗塔3 的流量的可以根据实际工况来调节，从而确保稀酸循环最终达到平衡状态；此外，粗氯乙烯合成气中绝大部分的氯化氢气体在降膜吸收器1 中除去，其余部分在水洗塔3中除去。The flow of the diluted acid entering the falling film absorber 1 and the flow entering the water washing tower 3 from the diluted acid tank 4 can be adjusted according to actual conditions, so as to ensure that the diluted acid cycle finally reaches an equilibrium state; in addition, the crude vinyl chloride synthesis gas Most of the hydrogen chloride gas is removed in the falling film absorber 1, and the rest is removed in the water washing tower 3.
实施例二Embodiment two
图2为本实用新型实施例二所提供的一种氯乙烯合成中副产物盐酸的解析和循环回收装置的结构示意图，本实施例中的解析和循环回收装置与实施例一中的解析和循环回收装置结构类似，不同地方在于，本实施例的解析和循环回收装置还包括再沸器11、稀酸泵12和水洗塔进酸冷却器13，再沸器11的入口与解析塔9的解析后稀酸出口连接，出口与解析塔9的再沸加热后的稀盐酸蒸汽入口连接；稀酸泵12的入口和出口分别与稀酸冷却器6的出口和稀酸槽4连接；水洗塔进酸冷却器13的入口与稀酸循环泵5的出口连接，出口与降膜吸收器1的循环液入口和水洗塔3的稀酸入口连接。Fig. 2 is a schematic structural diagram of the analysis and recycling device for the by-product hydrochloric acid in the synthesis of vinyl chloride provided in Embodiment 2 of the present utility model. The analysis and recycling device in this embodiment is the same as the analysis and recycling device in Embodiment 1. The recovery device is similar in structure, and the difference is that the analysis and recycling recovery device of the present embodiment also includes a reboiler 11, a dilute acid pump 12 and a water washing tower inlet acid cooler 13, and the inlet of the reboiler 11 is connected to the analysis of the analysis tower 9. The outlet of the rear dilute acid is connected, and the outlet is connected with the dilute hydrochloric acid steam inlet after the reboiling heating of the desorption tower 9; the inlet and the outlet of the dilute acid pump 12 are respectively connected with the outlet of the dilute acid cooler 6 and the dilute acid tank 4; The inlet of the acid cooler 13 is connected to the outlet of the dilute acid circulation pump 5 , and the outlet is connected to the inlet of the circulating liquid of the falling film absorber 1 and the inlet of the dilute acid of the water washing tower 3 .
更具体的，稀酸冷却器6为二级稀酸冷却器，包括第一级稀酸冷却器61和第二级稀酸冷却器62，第一级稀酸冷却器61的冷却介质为循环水，第二级稀酸冷却器62的冷却介质为7℃的循环水。第一级稀酸冷却器61的入口与浓酸预热器8的预冷后稀酸出口连接，第一级稀酸冷却器61的出口与第二级稀酸冷却器62的入口连接，第二级稀酸冷却器62的出口与稀酸泵12通过管道连接。More specifically, the dilute acid cooler 6 is a secondary dilute acid cooler, including a first dilute acid cooler 61 and a second dilute acid cooler 62, and the cooling medium of the first dilute acid cooler 61 is circulating water , the cooling medium of the second-stage dilute acid cooler 62 is circulating water at 7°C. The inlet of the first-stage dilute acid cooler 61 is connected to the pre-cooled dilute acid outlet of the concentrated acid preheater 8, and the outlet of the first-stage dilute acid cooler 61 is connected to the inlet of the second-stage dilute acid cooler 62. The outlet of the secondary dilute acid cooler 62 is connected to the dilute acid pump 12 through pipelines.
更具体的，氯化氢冷凝器10为二级氯化氢冷凝器，包括第一级氯化氢冷凝器101和第二级氯化氢冷凝器102，第一级氯化氢冷凝器101 的冷凝介质为7℃的循环水，第二级氯化氢冷凝器102的冷凝介质为 -35℃的冷冻盐水。第一级氯化氢冷凝器101的入口与解析塔9的解析后气体出口连接，第一级氯化氢冷凝器101的出口与第二级氯化氢冷凝器102的入口连接，第二级氯化氢冷凝器102的出口通过管道与HCl 回收总管连接。More specifically, the hydrogen chloride condenser 10 is a secondary hydrogen chloride condenser, including a first-stage hydrogen chloride condenser 101 and a second-stage hydrogen chloride condenser 102, and the condensing medium of the first-stage hydrogen chloride condenser 101 is circulating water at 7°C. The condensing medium of the secondary hydrogen chloride condenser 102 is frozen brine at -35°C. The inlet of the first stage hydrogen chloride condenser 101 is connected with the decomposed gas outlet of the desorption tower 9, the outlet of the first stage hydrogen chloride condenser 101 is connected with the inlet of the second stage hydrogen chloride condenser 102, and the outlet of the second stage hydrogen chloride condenser 102 Connect with HCl recovery main pipe through pipeline.
此外，水洗塔3为组合式水洗塔，包括从上而下设置的泡罩塔板和填料塔；同时，在水洗塔3的稀酸入口还连接设置有工业水补水管，并根据实际工况补入少量工业水，并从稀酸槽中排出与补入工业水同量的稀酸，用于中和碱洗塔中排出的废碱液，保证稀酸循环的正常运行。In addition, the water washing tower 3 is a combined water washing tower, including bubble cap trays and packed towers arranged from top to bottom; at the same time, an industrial water supply pipe is connected to the dilute acid inlet of the water washing tower 3, and according to the actual working conditions Add a small amount of industrial water, and discharge the same amount of dilute acid as the added industrial water from the dilute acid tank to neutralize the waste lye discharged from the alkali washing tower to ensure the normal operation of the dilute acid cycle.
本实施例所提供的解析和循环回收装置的工作过程与实施例一类似，不同的地方在于，其解析和循环回收效果更好，效率更高，且解析和循环回收过程的控制更加简单有效。The working process of the analysis and recycling device provided in this embodiment is similar to that of Embodiment 1, the difference lies in that the analysis and recycling effect is better, the efficiency is higher, and the control of the analysis and recycling process is simpler and more effective.
最后，以上仅为本实用新型的较佳实施方案，并非用于限定本实用新型的保护范围。凡在本实用新型的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本实用新型的保护范围之内。Finally, the above are only preferred implementations of the present utility model, and are not intended to limit the protection scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108314603A (en) * | 2018-03-29 | 2018-07-24 | 内蒙古鄂尔多斯电力冶金集团股份有限公司 | A kind of hydrochloric acid full stripping devices and methods therefor |
| CN108325541A (en) * | 2018-03-26 | 2018-07-27 | 内蒙古鄂尔多斯电力冶金集团股份有限公司 | The activation system and method for calcium carbide process PVC production of resins catalyst |
| CN108662921A (en) * | 2018-06-01 | 2018-10-16 | 湖南国盛石墨科技有限公司 | A kind of combined type graphite concentrated acid dilution cooler |
| CN114425175A (en) * | 2020-09-05 | 2022-05-03 | 中国石油化工股份有限公司 | High-boiling-point substance metal ion extraction and removal system and process |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108325541A (en) * | 2018-03-26 | 2018-07-27 | 内蒙古鄂尔多斯电力冶金集团股份有限公司 | The activation system and method for calcium carbide process PVC production of resins catalyst |
| CN108325541B (en) * | 2018-03-26 | 2023-12-05 | 内蒙古鄂尔多斯电力冶金集团股份有限公司 | System and method for activating catalyst for calcium carbide PVC resin production |
| CN108314603A (en) * | 2018-03-29 | 2018-07-24 | 内蒙古鄂尔多斯电力冶金集团股份有限公司 | A kind of hydrochloric acid full stripping devices and methods therefor |
| CN108662921A (en) * | 2018-06-01 | 2018-10-16 | 湖南国盛石墨科技有限公司 | A kind of combined type graphite concentrated acid dilution cooler |
| CN114425175A (en) * | 2020-09-05 | 2022-05-03 | 中国石油化工股份有限公司 | High-boiling-point substance metal ion extraction and removal system and process |
| CN114425175B (en) * | 2020-09-05 | 2023-04-07 | 中国石油化工股份有限公司 | High-boiling-point substance metal ion extraction and removal system and process |
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