Ethylene carbonate plant off-gas material recovery device
Patent Information
- Application Number
- CN202522433307.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-11-17
AI Technical Summary
然而，在碳酸乙烯酯的生产过程中，会产生大量含有未反应原料、中间产物以及目标产物的废气
来自碳酸乙烯酯反应釜废气，通过顶部的管线进入换热器预处理，然后将其输送至吸收塔进行吸收处理；废气从吸收塔的底部进入，吸收剂从塔顶的喷淋器喷淋而下，气液逆流接触，吸收选择性吸附废气中的碳酸乙烯酯、乙二醇、环氧乙烷；另外，通过液体补充储罐维持吸收塔的液位稳定；吸收塔顶部排出的尾气先送入到废气暂存罐，然后，沿着废气暂存罐的顶部进入在线气相色谱检测仪，实时监测碳酸乙烯酯、乙二醇、环氧乙烷的浓度，尾气中各污染物浓度满足排放要求就直接经排气筒排放；不满足的话，就通过管线回流到吸收塔继续处理；不仅实现了资源循环，而且也降低企业环保成本。
Smart Images
Figure CN224822118U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ethylene carbonate production technology, and in particular to a waste gas material recovery device for ethylene carbonate production plants. Background Technology
[0002] With the rapid development of the chemical industry, ethylene carbonate, as an important organic solvent and intermediate, is widely used in lithium-ion battery electrolytes, coatings, pharmaceuticals, and other fields. However, the production process of ethylene carbonate generates a large amount of waste gas containing unreacted raw materials, intermediate products, and target products. Direct emission of this waste gas not only wastes materials and increases production costs but also causes serious environmental pollution, bringing enormous environmental pressure. The technology for waste gas recovery in ethylene carbonate production is relatively backward, with problems such as low recovery efficiency, high energy consumption, and secondary pollution. Therefore, conducting research on waste gas recovery technology for ethylene carbonate plants and developing efficient, energy-saving, and environmentally friendly recovery technologies is of significant practical importance for improving the economic benefits of enterprises and reducing environmental impact. Utility Model Content
[0003] The purpose of this invention is to address the aforementioned deficiencies in the existing technology by providing a waste gas material recovery device for an ethylene carbonate production line. This device can effectively recover ethylene oxide and ethylene carbonate from the waste gas, thereby reducing environmental pollution from the waste gas and reducing carbon emissions.
[0004] This utility model discloses a waste gas material recovery device for an ethylene carbonate plant. The technical solution includes an ethylene carbonate reactor (T101), a heat exchanger (E201), an absorption tower (T201), a waste gas storage tank (V201), an online gas chromatograph (C201), a liquid replenishment tank (V101), a level control pump (P101), and an external pump for the absorption tower (P201). The top of the ethylene carbonate reactor (T101) is connected to the absorption tower (T201) via pipelines and the heat exchanger (E201). 1) The side line of the absorption tower (T201) is connected to the liquid replenishment storage tank (V101) via pipeline and liquid level control transfer pump (P101). The top of the absorption tower (T201) is connected to the waste gas storage tank (V201) via pipeline. The lower part of the waste gas storage tank (V201) is connected to the absorption tower (T201) via pipeline. The top of the waste gas storage tank (V201) is connected to the online gas chromatograph (C201) via pipeline. The bottom of the absorption tower (T201) is connected to the absorption tower external pump (P201) via pipeline.
[0005] Preferably, the absorption tower (T201) mentioned above includes a tower body (T201.1), a spray tower (T201.2), and a sprayer (T201.4). The spray tower (T201.2) is installed on the top of the tower body (T201.1), and the sprayer (T201.4) is installed in the upper inner cavity of the spray tower (T201.2).
[0006] Preferably, the absorption tower (T201) further includes an injection pipe (T201.3), the lower outlet of which is located below the liquid level of the tower body (T201.1), and the upper inlet of which is connected to the air inlet of the tower body (T201.1).
[0007] Preferably, the upper part of the above-mentioned air injection pipe (T201.3) is fitted with a float block (a1).
[0008] Preferably, the sprayer (T201.4) is an umbrella-shaped structure and is located above the spray tower (T201.2), with honeycomb filler (a2) installed below the sprayer (T201.4).
[0009] Preferably, a transparent observation device (b1) is installed on one side of the aforementioned waste gas storage tank (V201).
[0010] The beneficial effects of this utility model are: Waste gas from the ethylene carbonate reactor is pretreated in a heat exchanger via a top pipeline, and then transported to an absorption tower for absorption. The waste gas enters from the bottom of the absorption tower, while the absorbent is sprayed down from a sprayer at the top, creating a counter-current gas-liquid contact that selectively adsorbs ethylene carbonate, ethylene glycol, and ethylene oxide from the waste gas. A liquid replenishment tank maintains a stable liquid level in the absorption tower. The exhaust gas from the top of the absorption tower is first sent to a waste gas storage tank, and then flows along the top of the storage tank into an online gas chromatograph to monitor the concentrations of ethylene carbonate, ethylene glycol, and ethylene oxide in real time. If the concentrations of each pollutant in the exhaust gas meet emission requirements, it is directly discharged through the exhaust stack; otherwise, it is returned to the absorption tower via pipeline for further treatment. This not only achieves resource recycling but also reduces the company's environmental protection costs. Attached Figure Description
[0011] Figure 1 This is a connection diagram of Embodiment 1 of this utility model; Figure 2 This is a connection diagram of Embodiment 2 of this utility model; In the diagram above: Ethylene carbonate reactor T101, heat exchanger E201, absorption tower T201, waste gas storage tank V201, online gas chromatograph C201, liquid replenishment tank V101, liquid level control transfer pump P101, absorption tower external pump P201, tower body T201.1, spray tower T201.2, gas injection pipe T201.3, sprayer T201.4, float block a1, honeycomb filler a2, transparent observer b1, control valve c1. Detailed Implementation
[0012] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0013] Example 1, referring to Figure 1 This utility model discloses a waste gas material recovery device for an ethylene carbonate plant, comprising an ethylene carbonate reactor T101, a heat exchanger E201, an absorption tower T201, a waste gas storage tank V201, an online gas chromatograph C201, a liquid replenishment tank V101, a liquid level control pump P101, and an absorption tower external pump P201. The top of the ethylene carbonate reactor T101 is connected to the absorption tower T201 via pipelines and the heat exchanger E201. The side line of the absorption tower T201 is connected to the liquid replenishment storage tank V101 via pipeline and liquid level control transfer pump P101. The top of the absorption tower T201 is connected to the waste gas storage tank V201 via pipeline. The lower part of the waste gas storage tank V201 is connected to the absorption tower T201 via pipeline. The top of the waste gas storage tank V201 is connected to the online gas chromatograph C201 via pipeline. The bottom of the absorption tower T201 is connected to the absorption tower external transfer pump P201 via pipeline.
[0014] The aforementioned absorption tower T201 includes a tower body T201.1, a spray tower T201.2, and a sprayer T201.4. The spray tower T201.2 is installed on the top of the tower body T201.1, and the sprayer T201.4 is installed in the upper inner cavity of the spray tower T201.2. The absorbent is sprayed out through the sprayer T201.4. It should be noted that the absorbent is a conventional technology well known to those skilled in the art, and will not be described in detail here.
[0015] The aforementioned absorption tower T201 also includes an injection pipe T201.3. The lower outlet of the injection pipe T201.3 is located below the liquid level of the tower body T201.1, and the upper inlet of the injection pipe T201.3 is connected to the air inlet of the tower body T201.1.
[0016] The float block a1 is fitted on the upper part of the above-mentioned air injection pipe T201.3, which can keep the lower end of the air injection pipe inside the liquid and the upper end above the liquid surface.
[0017] The sprayer T201.4 has an umbrella-shaped structure and is located above the spray tower T201.2. The honeycomb filler a2 is installed below the sprayer T201.4 to better allow the gas to come into contact with the absorbent liquid and achieve a better absorption effect.
[0018] A transparent observation device b1 is installed on one side of the aforementioned waste gas storage tank V201 to observe the internal condition of the waste gas storage tank V201.
[0019] When using this utility model, The waste gas from the ethylene carbonate reactor T101, with a temperature of 40-60℃, a pressure of 0.12-0.15MPa, and a flow rate of 500-1000 Nm³ / h, contains ethylene carbonate, ethylene glycol, ethylene oxide, and inert gases such as nitrogen and carbon dioxide. This waste gas enters the heat exchanger E201 through a top pipeline, where circulating cooling water lowers the temperature to 25-30℃ and simultaneously condenses to remove over 80% of the free moisture, preventing moisture from affecting the solubility of the absorbent. After pretreatment, the waste gas temperature is 25-30℃, the pressure is 0.11-0.13MPa, the solid impurity content is ≤1mg / Nm³, and the moisture content is ≤0.5%. This pretreated waste gas is then transported to the absorption tower T201 for absorption treatment. The waste gas enters from the bottom of the absorption tower, and the absorbent is sprayed down from the top of the tower by the sprayer T201.4. The gas and liquid come into countercurrent contact. Under the conditions of operating temperature of 25-35℃ and pressure of 0.11-0.13MPa, the absorbent selectively adsorbs ethylene carbonate, ethylene glycol and ethylene oxide in the waste gas. In addition, the liquid level of the absorption tower T201 is maintained stable by the liquid replenishment storage tank V101 and the liquid level control transfer pump P101 of the liquid level control system. The tail gas discharged from the top of the absorption tower T201 is first sent to the waste gas storage tank V201, and then enters the online gas chromatograph C201 along the top of the waste gas storage tank V201 to monitor the concentration of ethylene carbonate, ethylene glycol and ethylene oxide in real time. The concentration of each pollutant in the tail gas meets the requirements of the "Emission Standard of Pollutants for Petrochemical Industry" GB 31571-2015: ethylene carbonate ≤0.05mg / m³, ethylene glycol ≤0.03mg / m³, ethylene oxide ≤0.02mg / m³, and is directly discharged through the exhaust stack with a height of ≥15m. The bottom of the waste gas storage tank V201 is connected to the absorption tower T201 via a pipeline and control valve c1. When the condensed liquid or waste gas emissions fail to meet the standards after a period of time, the control valve c1 is opened to send it back to the absorption tower T201 for further processing.
[0020] Example 2: A waste gas material recovery device for an ethylene carbonate plant mentioned in this utility model includes an ethylene carbonate reactor T101, a heat exchanger E201, an absorption tower T201, a waste gas storage tank V201, an online gas chromatograph C201, a liquid replenishment tank V101, a liquid level control pump P101, and an absorption tower external pump P201. The top of the ethylene carbonate reactor T101 is connected to the absorption tower T201 via pipelines and the heat exchanger E201. 1. The side line of the absorption tower T201 is connected to the liquid replenishment storage tank V101 via pipeline and liquid level control transfer pump P101. The top of the absorption tower T201 is connected to the waste gas temporary storage tank V201 via pipeline. The lower part of the waste gas temporary storage tank V201 is connected to the absorption tower T201 via pipeline. The top of the waste gas temporary storage tank V201 is connected to the online gas chromatograph C201 via pipeline. The bottom of the absorption tower T201 is connected to the absorption tower external transfer pump P201 via pipeline.
[0021] The difference from Example 1 is: Reference Figure 2 The bottom of the absorption tower T201 is connected to the external pump P201 via a pipeline. The outlet of the external pump P201 is divided into two paths: one path is directly discharged for treatment, and the other path is connected to the front end of the ethylene carbonate reactor T101 via a pipeline for recycling.
[0022] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.
Claims
1. A waste gas material recovery device for an ethylene carbonate plant, characterized in that: Including carbonic acid The system includes an ethylene carbonate reactor (T101), a heat exchanger (E201), an absorption tower (T201), a waste gas storage tank (V201), an online gas chromatograph (C201), a liquid replenishment tank (V101), a level control transfer pump (P101), and an absorption tower external pump (P201). The top of the ethylene carbonate reactor (T101) is connected to the absorption tower (T201) via pipelines and the heat exchanger (E201). The side lines of the absorption tower (T201) are connected via... The pipeline and level control transfer pump (P101) are connected to the liquid replenishment storage tank (V101). The top of the absorption tower (T201) is connected to the waste gas storage tank (V201) via a pipeline. The bottom of the waste gas storage tank (V201) is connected to the absorption tower (T201) via a pipeline. The top of the waste gas storage tank (V201) is connected to the online gas chromatograph (C201) via a pipeline. The bottom of the absorption tower (T201) is connected to the absorption tower external pump (P201) via a pipeline.
2. The waste gas recovery device for an ethylene carbonate plant according to claim 1, characterized in that: The absorption tower (T201) includes a tower body (T201.1), a spray tower (T201.2), and a sprayer (T201.4). The spray tower (T201.2) is installed on the top of the tower body (T201.1), and the sprayer (T201.4) is installed in the upper inner cavity of the spray tower (T201.2).
3. The waste gas recovery device for an ethylene carbonate plant according to claim 2, characterized in that: The absorption tower (T201) also includes a gas injection pipe (T201.3). The lower outlet of the gas injection pipe (T201.3) is located below the liquid level of the tower body (T201.1), and the upper inlet of the gas injection pipe (T201.3) is connected to the air inlet of the tower body (T201.1).
4. The waste gas recovery device for an ethylene carbonate plant according to claim 3, characterized in that: The upper part of the air injection pipe (T201.3) is fitted with a float block (a1).
5. The waste gas recovery device for an ethylene carbonate plant according to claim 4, characterized in that: The sprayer (T201.4) has an umbrella-shaped structure and is located above the spray tower (T201.2). A honeycomb filler (a2) is installed below the sprayer (T201.4).
6. The ethylene carbonate plant waste gas recovery device according to claim 5, characterized in that: A transparent observation device (b1) is installed on one side of the waste gas storage tank (V201).