Device for recycling methanol in washing water
By designing a methanol recovery and reuse device for washing water, the problems of methanol waste and reduced catalyst activity in the C4 device were solved, methanol recovery and reuse, energy saving were achieved, and product yield was improved.
Patent Information
- Application Number
- CN202422606100.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-10-28
AI Technical Summary
In the prior art, the methanol content in the washing solution of the etherification unit of the C4 device is high, and directly discharging it as wastewater results in methanol waste and affects catalyst activity, increasing production costs.
A methanol recovery and reuse device for washing water was designed. Through a system consisting of an extraction tower, a methanol recovery tower, a heat exchanger, a condenser and other equipment, methanol recovery and recycling were achieved, thereby reducing the methanol content in the extraction water.
The recovery and reuse of methanol is achieved, the impact on the catalyst is reduced, the product yield is increased and energy consumption is saved.
Smart Images
Figure CN223372824U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a recovery system for an etherification unit of a C4 device, in particular to a device for recovering and reusing methanol in washing water. Background Art
[0002] The C4 raw material with high isobutylene content required for the etherification reaction of the C4 unit is obtained through the isomerization reaction of butene. The conversion rate of the butene isomerization reaction directly affects the isobutylene content in the etherification feed C4, and methanol will reduce the catalyst activity, resulting in an increase in the production cost of the unit. In order to reduce the impact of methanol on the isomerization reaction catalyst, it is necessary to remove the methanol from the C4 fed to the reaction unit. The etherification unit recovery system of the C4 unit mainly removes the methanol in the remaining C4 extracted from the top of the catalytic distillation tower through water washing and dissolution in the extraction tower. The material after water washing is sent to the de-dimethyl ether tower for distillation treatment and then returned to the isomerization reaction unit to participate in the reaction again, thereby improving the product yield of the unit. The methanol content in the extraction water in the extraction tower is about 20%. If it is directly treated as methanol wastewater, it will not only increase the wastewater disposal cost of the unit, but also the methanol in the wastewater cannot be recovered, resulting in a waste of methanol. Utility Model Content
[0003] The purpose of the present invention is to address the above-mentioned defects of the prior art and provide a device for recovering and reusing methanol in wash water, which not only recovers methanol from wastewater to avoid wasting methanol, but also reduces the impact of methanol on the isomerization reaction catalyst and improves the product yield of the device.
[0004] The utility model discloses a device for recovering and reusing methanol from washing water, and its technical solution is as follows: comprising an extraction tower (C-6402), a methanol recovery tower (C-6403), a methanol recovery tower inlet and outlet heat exchanger (E-6408), a circulating extraction water cooler (E-6409), an extraction water circulation pump (P-6406), a methanol recovery tower top condenser (E-6411), a methanol recovery tower top reflux tank (D-6404), a methanol recovery tower reflux pump (P-6407), and a methanol raw material tank (D-6402), wherein the bottom outlet of the extraction tower (C-6402) is connected to the shell side inlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) through a pipeline; the shell side outlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) is connected to the shell side outlet of the methanol recovery tower through a pipeline. The pipeline is connected to the upper feed inlet of the methanol recovery tower (C-6403), the top of the methanol recovery tower (C-6403) is connected to the shell side inlet of the methanol recovery tower top condenser (E-6411) through a pipeline, and the shell side outlet of the methanol recovery tower top condenser (E-6411) is connected to the top inlet of the methanol recovery tower top reflux tank (D-6404); the bottom outlet of the methanol recovery tower top reflux tank (D-6404) is connected to the methanol raw material tank (D-6402) through a pipeline; the bottom of the methanol recovery tower (C-6403) is connected to the tube side inlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) through a pipeline, and the tube side outlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) is connected to the upper side of the extraction tower (C-6402) through a pipeline.
[0005] Preferably, the outlet of the methanol recovery tower reflux pump (P-6407) is connected to the top reflux port of the methanol recovery tower (C-6403) through a first pipeline, and is connected to the top inlet of the methanol raw material tank (D-6402) through a second pipeline.
[0006] Preferably, the tube-side outlet of the above-mentioned methanol recovery tower inlet and outlet heat exchanger (E-6408) is connected to the shell-side inlet of the circulating extraction water cooler (E-6409) through a pipeline, and the shell-side outlet of the circulating extraction water cooler (E-6409) is connected to the upper side of the extraction tower (C-6402) through a pipeline.
[0007] Preferably, the shell-side outlet of the above-mentioned circulating extraction water cooler (E-6409) is connected to the inlet of the extraction water circulation pump (P-6406) through a pipeline, and the outlet of the extraction water circulation pump (P-6406) is connected to the upper side inlet of the extraction tower (C-6402) through a pipeline.
[0008] Preferably, a first control valve (a1) is provided on the first pipeline, and a second control valve (a2) is provided on the second pipeline.
[0009] The beneficial effects of the utility model are as follows: the methanol recovery tower of the utility model performs distillation, the gaseous methanol extracted from the top of the methanol recovery tower is cooled and condensed by the methanol recovery tower top condenser and then sent to the methanol recovery tower top reflux tank, the high-temperature circulating extraction water at the bottom of the methanol recovery tower is sent to the methanol recovery tower inlet and outlet heat exchanger for heat exchange, and then sent to the circulating extraction water cooler for cooling and cooling treatment, after being cooled by the circulating extraction water cooler, the circulating extraction water with a temperature reduced to below 60°C is sent to the circulating extraction water and sent to the extraction tower for use as extraction tower washing water, thereby realizing the recovery and reuse of methanol in the washing water and the recycling of the aqueous solution after extraction, saving energy consumption, and in addition, not only the methanol in the wastewater is recovered and reused to avoid the waste of methanol, but also the influence of methanol on the isomerization reaction catalyst is reduced, thereby improving the product yield of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;
[0011] Figure 2 This is a schematic structural diagram of Example 2 of the present utility model;
[0012] In the figure above: extraction tower (C-6402), methanol recovery tower (C-6403), methanol recovery tower inlet and outlet heat exchanger (E-6408), circulating extraction water cooler (E-6409), extraction water circulation pump (P-6406), methanol recovery tower top condenser (E-6411), methanol recovery tower top reflux tank (D-6404), methanol recovery tower reflux pump (P-6407), methanol raw material tank (D-6402), first control valve (a1), second control valve (a2). DETAILED DESCRIPTION
[0013] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.
[0014] Example 1, with reference to Figure 1The utility model mentions a methanol recovery and reuse device for washing water, comprising an extraction tower (C-6402), a methanol recovery tower (C-6403), a methanol recovery tower inlet and outlet heat exchanger (E-6408), a circulating extraction water cooler (E-6409), an extraction water circulation pump (P-6406), a methanol recovery tower top condenser (E-6411), a methanol recovery tower top reflux tank (D-6404), a methanol recovery tower reflux pump (P-6407), and a methanol raw material tank (D-6402). The bottom outlet of the extraction tower (C-6402) is connected to the shell side inlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) through a pipeline; the shell side outlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) is connected to the shell side outlet of the methanol recovery tower through a pipeline. The methanol recovery tower (C-6403) is connected to the upper feed inlet of the methanol recovery tower (C-6403), the top of the methanol recovery tower (C-6403) is connected to the shell side inlet of the methanol recovery tower top condenser (E-6411) through a pipeline, and the shell side outlet of the methanol recovery tower top condenser (E-6411) is connected to the top inlet of the methanol recovery tower top reflux tank (D-6404); the bottom outlet of the methanol recovery tower top reflux tank (D-6404) is connected to the methanol raw material tank (D-6402) through a pipeline; the bottom of the methanol recovery tower (C-6403) is connected to the tube side inlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) through a pipeline, and the tube side outlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) is connected to the upper side of the extraction tower (C-6402) through a pipeline.
[0015] The outlet of the above-mentioned methanol recovery tower reflux pump (P-6407) is connected to the top reflux port of the methanol recovery tower (C-6403) through a first pipeline, and is connected to the top inlet of the methanol raw material tank (D-6402) through a second pipeline.
[0016] The tube-side outlet of the above-mentioned methanol recovery tower inlet and outlet heat exchanger (E-6408) is connected to the shell-side inlet of the circulating extraction water cooler (E-6409) through a pipeline, and the shell-side outlet of the circulating extraction water cooler (E-6409) is connected to the upper side of the extraction tower (C-6402) through a pipeline.
[0017] The first pipeline is provided with a first control valve (a1), and the second pipeline is provided with a second control valve (a2).
[0018] When the utility model is used, the water-containing methanol extracted from the bottom of the extraction tower (C-6402) is preheated by the methanol recovery tower inlet and outlet heat exchanger (E-6408) and then sent to the methanol recovery tower (C-6403) for distillation operation. The gaseous methanol extracted from the top of the methanol recovery tower (C-6403) is cooled and condensed by the methanol recovery tower top condenser (E-6411) and then sent to the methanol recovery tower top reflux tank (D-6404). The methanol in the methanol recovery tower top reflux tank (D-6404) is pressurized by the methanol recovery tower reflux pump (P-6407) and a part of the recovered methanol is returned to the top of the methanol recovery tower (C-6403) as methanol. The other part of the recovered methanol is sent to the methanol raw material tank (D-6402) for use as raw methanol. The high-temperature circulating extraction water at the bottom of the methanol recovery tower (C-6403) is sent to the methanol recovery tower inlet and outlet heat exchanger (E-6408) for heat exchange, and then sent to the circulating extraction water cooler (E-6409) for cooling. After being cooled by the circulating extraction water cooler (E-6409), the circulating extraction water with a temperature below 60°C is sent to the circulating extraction water and sent to the extraction tower (C-6402) for use as extraction tower washing water, thereby realizing the recovery and reuse of methanol in the washing water and the recycling of the aqueous solution after extraction.
[0019] Example 2, the utility model mentions a methanol recovery and reuse device for washing water, comprising an extraction tower (C-6402), a methanol recovery tower (C-6403), a methanol recovery tower inlet and outlet heat exchanger (E-6408), a circulating extraction water cooler (E-6409), an extraction water circulation pump (P-6406), a methanol recovery tower top condenser (E-6411), a methanol recovery tower top reflux tank (D-6404), a methanol recovery tower reflux pump (P-6407), and a methanol raw material tank (D-6402). The bottom outlet of the extraction tower (C-6402) is connected to the shell side inlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) through a pipeline; the shell side outlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) is connected to the shell side outlet of the methanol recovery tower through a pipe. The line is connected to the upper feed inlet of the methanol recovery tower (C-6403), the top of the methanol recovery tower (C-6403) is connected to the shell side inlet of the methanol recovery tower top condenser (E-6411) through a pipeline, and the shell side outlet of the methanol recovery tower top condenser (E-6411) is connected to the top inlet of the methanol recovery tower top reflux tank (D-6404); the bottom outlet of the methanol recovery tower top reflux tank (D-6404) is connected to the methanol raw material tank (D-6402) through a pipeline; the bottom of the methanol recovery tower (C-6403) is connected to the tube side inlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) through a pipeline, and the tube side outlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) is connected to the upper side of the extraction tower (C-6402) through a pipeline.
[0020] The difference from Example 1 is:
[0021] Reference Figure 2 The shell-side outlet of the circulating extraction water cooler (E-6409) of this embodiment is connected to the inlet of the extraction water circulation pump (P-6406) through a pipeline, and the outlet of the extraction water circulation pump (P-6406) is connected to the upper side inlet of the extraction tower (C-6402) through a pipeline.
[0022] During use, after being cooled by the circulating extraction water cooler (E-6409), the circulating extraction water with a temperature reduced to below 60°C is sent to the extraction water circulation pump (P-6406) for pressurization. The circulating extraction water pressurized by the extraction water circulation pump (P-6406) is sent to the extraction tower (C-6402) and used as extraction tower washing water, thereby realizing the recovery and reuse of methanol in the washing water and the recycling of the aqueous solution after extraction.
[0023] The above description is merely a preferred embodiment of the present invention. Anyone skilled in the art may utilize the above-described technical solutions to modify the present invention or create equivalent technical solutions. Therefore, any simple modifications or equivalent transformations based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.
Claims
1. A device for recovering and reusing methanol from washing water, characterized by: It includes an extraction tower (C-6402), a methanol recovery tower (C-6403), a methanol recovery tower inlet and outlet heat exchanger (E-6408), a circulating extraction water cooler (E-6409), an extraction water circulation pump (P-6406), a methanol recovery tower top condenser (E-6411), a methanol recovery tower top reflux tank (D-6404), a methanol recovery tower reflux pump (P-6407), and a methanol raw material tank (D-6402). The bottom outlet of the extraction tower (C-6402) is connected to the shell side inlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) through a pipeline; the shell side outlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) is connected to the methanol recovery tower (C-6411) through a pipeline. 03) Upper feed inlet, the top of the methanol recovery tower (C-6403) is connected to the shell side inlet of the methanol recovery tower top condenser (E-6411) through a pipeline, and the shell side outlet of the methanol recovery tower top condenser (E-6411) is connected to the top inlet of the methanol recovery tower top reflux tank (D-6404); the bottom outlet of the methanol recovery tower top reflux tank (D-6404) is connected to the methanol raw material tank (D-6402) through a pipeline; the bottom of the methanol recovery tower (C-6403) is connected to the tube side inlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) through a pipeline, and the tube side outlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) is connected to the upper side of the extraction tower (C-6402) through a pipeline.
2. The device for recovering and reusing methanol in washing water according to claim 1, wherein: The outlet of the methanol recovery tower reflux pump (P-6407) is connected to the top reflux port of the methanol recovery tower (C-6403) through a first pipeline, and is connected to the top inlet of the methanol raw material tank (D-6402) through a second pipeline.
3. The device for recovering and reusing methanol in washing water according to claim 2, wherein: The tube-side outlet of the methanol recovery tower inlet and outlet heat exchanger (E-6408) is connected to the shell-side inlet of the circulating extraction water cooler (E-6409) through a pipeline, and the shell-side outlet of the circulating extraction water cooler (E-6409) is connected to the upper side of the extraction tower (C-6402) through a pipeline.
4. The device for recovering and reusing methanol from washing water according to claim 3, wherein: The shell side outlet of the circulating extraction water cooler (E-6409) is connected to the inlet of the extraction water circulation pump (P-6406) through a pipeline, and the outlet of the extraction water circulation pump (P-6406) is connected to the upper side inlet of the extraction tower (C-6402) through a pipeline.
5. The device for recovering and reusing methanol in washing water according to claim 2, wherein: The first pipeline is provided with a first control valve (a1), and the second pipeline is provided with a second control valve (a2).