System for removing heat-stable salt in organic amine liquid and method

An organic amine liquid and organic amine technology, which are applied in the field of organic amine liquid purification, can solve the problems of difficulty in removing cations, large consumption of chemical agents, and large discharge of waste liquid.

Pending Publication Date: 2020-01-24
BEIJING SIJIANTONG TECH&DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of large chemical agent consumption, large waste liquid discharge and difficulty in removing cations in the existing ion exchange technology for removing thermally stable salts from amine liquids, and to provide a thermally stable salt removal technology for removing orga

Method used

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  • System for removing heat-stable salt in organic amine liquid and method
  • System for removing heat-stable salt in organic amine liquid and method
  • System for removing heat-stable salt in organic amine liquid and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The system for removing heat-stable salts in organic amine liquids provided in this example is a skid-mounted system, and its structural diagram is as follows figure 1 As shown, the system includes: an organic amine liquid storage device 1, an electrode liquid storage device 2, a demineralized water storage device 3, a membrane stack 4 and a control center 5, wherein the membrane stack 4 is respectively connected to the organic amine liquid storage device 1. The electrode liquid storage device 2 and the demineralized water storage device 3; the membrane stack 4 is provided with at least one organic amine liquid inlet, organic amine liquid outlet, waste liquid inlet, waste liquid outlet, electrode liquid inlet and electrode liquid outlet; the outlet of the organic amine liquid and the outlet of the waste liquid are respectively provided with a first conductivity meter 91 and a second conductivity meter 92 for monitoring the outlet of the organic amine liquid and the outle...

Embodiment 2

[0088] The system for removing heat-stable salts in organic amine liquids provided in this example and the method for treating organic amine liquids containing heat-stable salts using the system for removing heat-stable salts in organic amine liquids are as in Example 1, except that , the membrane stack 4 is a bipolar membrane stack, and its structural schematic diagram and working principle are as follows figure 2 As shown, the first ion exchange membrane A is a bipolar membrane, the second ion exchange membrane B is an anion exchange membrane, and the bipolar membrane stack includes 100 sets of bipolar membranes and anion membranes arranged alternately periodically. The exchange membrane and the third ion exchange membrane C, the third ion exchange membrane C is a cation exchange membrane, which is arranged close to the anode plate, and from the third ion exchange membrane C to the direction of the cathode plate, the module includes in turn Multiple anion exchange membranes...

Embodiment 3

[0094] The system for removing heat-stable salts in organic amine liquids provided in this example and the method for treating organic amine liquids containing heat-stable salts using the system for removing heat-stable salts in organic amine liquids are as in Example 1, except that , the system is also provided with an lye input device, and the liquid outlet of the lye input device is connected with the organic amine liquid inlet of the membrane stack 4 . The lye is sodium hydroxide, and the concentration of the lye is 30% by weight.

[0095] The organic amine solution to be treated is an organic amine solution prepared by industrial pure MDEA (hydrochloric acid is added to the amine solution). Show.

[0096] table 3

[0097]

[0098] It can be seen from Table 3 that after the treatment, the conductivity of the organic amine solution decreases, the concentration of sodium ions, chloride ions and heat-stable salt decreases, while the conductivity of desalted water increas...

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PUM

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Abstract

The invention relates to the field of purification of organic amine liquid, and discloses a system for removing a heat-stable salt in organic amine liquid and a method for treating the organic amine liquid by adopting the system. The system comprises an organic amine liquid storage device, an electrode liquid storage device, a desalting water storage device and a membrane stack, wherein the membrane stack communicates with the organic amine liquid storage device, the electrode liquid storage device and the desalting water storage device separately, and an organic amine liquid circulation loop,an electrode liquid circulation loop and a desalting water circulation loop are formed separately, the system further comprises conductivity meters and a control center, and the control center is used for receiving conductivity signals from the conductivity meters, and for adjusting circulation flows of the organic amine liquid circulation loop and the desalting water circulation loop, reuse of the organic amine liquid and discharge of waste liquid according to the conductivity signals of the conductivity meters. When the organic amine liquid is treated by the system, anions and cations in the amine liquid can be removed synchronously, so that consumption of alkali liquid and discharge of the waste liquid are reduced.

Description

technical field [0001] The invention relates to the field of purification of organic amine liquids, in particular to a system for removing heat-stable salts in organic amine liquids and a method for using the system to treat organic amine liquids containing heat-stable salts. Background technique [0002] In the field of petrochemical industry, there are many raw materials containing a large amount of acid gas, such as carbon dioxide (CO 2 ), hydrogen sulfide (H 2 S), sulfur dioxide (SO 2 ), etc., it is necessary to remove these acid gases before entering the next step of the process. [0003] Organic amine method is widely used to remove acid gas in natural gas, liquefied gas and flue gas. Among them, commonly used organic amines include ethanolamine (MEA), diethanolamine (DEA), N-methyldiethanolamine (MDEA), triethanolamine, N-methylethylenediamine, diisopropanolamine, N,N-di Butylethanolamine, ethylenediamine, diethylamine, tetramethylethylenediamine, piperazine, etc....

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D61/42B01D61/48
CPCB01D53/1425B01D53/1468B01D53/1475B01D53/1481B01D53/1493B01D61/422B01D61/48B01D2252/20405B01D2252/2041B01D2252/20447B01D2252/20489B01D2256/245B01D2258/0283Y02A20/124
Inventor 童扬传朱纯峰周跃李云龙
Owner BEIJING SIJIANTONG TECH&DEV
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