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A system and process for extracting ammonia from acidic condensate in coal chemical industry

A technology for condensate and coal chemical industry, applied in the chemical industry, ammonia compounds, inorganic chemistry, etc., can solve the problems of unstable operation, large circulation, and poor quality of liquid ammonia products.

Active Publication Date: 2021-02-09
CHINA CHENGDA ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For the conversion of acidic condensate treatment to extract ammonia, at present, the domestic general use of reference oil refinery containing H 2 S, NH 3 (Less CO2 content) sideline extraction technology for acidic water treatment, but due to the conversion of acidic condensate contains a large amount of CO 2 , CO 2 / NH 3 If the ratio is high, if the stripping side-line extraction technology is adopted, the CO in the side-line extraction gas 2 Relatively high, it is difficult for the subsequent ammonia extraction, the circulation volume is large, the operation is unstable, and the quality of the liquid ammonia product is poor

Method used

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  • A system and process for extracting ammonia from acidic condensate in coal chemical industry
  • A system and process for extracting ammonia from acidic condensate in coal chemical industry
  • A system and process for extracting ammonia from acidic condensate in coal chemical industry

Examples

Experimental program
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Effect test

specific Embodiment ： Embodiment 1

[0022] Raw material described in the present embodiment, composition are as follows (WT%)

[0023] NH 3 1%;

[0024] CO 2 2.6%;

[0025] h 2 S 0.03%;

[0026] the rest is water;

[0027] Temperature: 40°C;

[0028] Pressure: 4BAR.

[0029] The operating conditions of this example: CO 2 Separation tower operating pressure: 17BAR; ammonia desorption tower operating pressure: 3BAR.

[0030] The specific process flow is: containing NH 3 , CO 2 、H 2 S and H 2 After the condensate of O is pressurized to 8-20BAR by the ammonia-containing condensate pump, it is divided into cold and hot materials, and part of it is preheated by the ammonia-containing condensate preheater and then enters the CO 2 Separator for CO 2 and H 2 For the separation of S, the tower operates at a pressure of 1.7MPaA, and the separated CO 2 The gas comes out from the top of the tower, to prevent NH 3 with CO 2 Condensation forms crystals, CO 2 Washing water is added to the top of the separat...

Embodiment 2

[0035] The process flow described in this embodiment is the same as that in Embodiment 1. The condensate consists of the following:

[0036] NH 3 1.65%;

[0037] CO 2 4.05%;

[0038] h 2 S 0.17%;

[0039] the rest is water;

[0040] Temperature: 40°C;

[0041] Pressure: 4BAR.

[0042] The operating conditions of this example: CO 2 Separation tower operating pressure: 17BAR; ammonia desorption tower operating pressure: 3BAR.

Embodiment 3

[0044] The process flow described in this embodiment is the same as that in Embodiment 1. The condensate consists of the following:

[0045] NH 3 8.7%;

[0046] CO 2 12%;

[0047] h 2 S 0.6%;

[0048] the rest is water;

[0049] Temperature: 85°C;

[0050] Pressure: 4BAR.

[0051] The operating conditions of this example: CO 2 Separation tower operating pressure: 17BAR; ammonia desorption tower operating pressure: 3BAR.

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Abstract

The invention discloses a coal chemical industry conversion acid condensate ammonia extraction system and an ammonia extraction process. The ammonia extraction system includes CO 2 Separation tower, ammonia desorption tower and ammonia rectification tower, the acid-containing condensate passes through the ammonia-containing condensate pump and CO 2 The separation tower is connected, the CO 2 The tower bottom of the separation tower is connected with the ammonia desorption tower, and the tower top of the ammonia desorption tower is connected with the ammonia rectification tower through the condensation assembly, and the tower top of the ammonia rectification tower is successively connected with the sulfur adsorber, the ammonia compressor, the ammonia condensation tower Device and liquid ammonia buffer tank connection. The present invention aims at transforming the thermodynamic characteristics of the condensate, by separately setting the CO 2 The separation tower and the ammonia desorption tower, according to the thermodynamic characteristics of the material system, use the principle of equilibrium separation, adopt different pressures, and separate CO from the condensate by staged pressure change. 2 、H 2 S and NH 3 , Effectively solve a series of problems such as unstable production composition, low yield of liquid ammonia, poor quality of liquid ammonia products, and serious sulfur corrosion of equipment that affects the operation of the existing single-tower sideline extraction technology.

Description

technical field [0001] The invention belongs to the technical field of environmental protection for the treatment of acidic condensate, and in particular relates to an ammonia extraction system and process for converting acidic condensate in a coal chemical industry. Background technique [0002] For the conversion of acidic condensate treatment to extract ammonia, at present, the domestic general use of reference oil refinery containing H 2 S, NH 3 (Less CO2 content) sideline extraction technology for acidic water treatment, but due to the conversion of acidic condensate contains a large amount of CO 2 , CO 2 / NH 3 If the ratio is high, if the stripping side-line extraction technology is adopted, the CO in the side-line extraction gas 2 Relatively high, it is more difficult for subsequent ammonia extraction, the circulation volume is large, the operation is unstable, and the quality of liquid ammonia products is poor. Contents of the invention [0003] The object of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01C1/10C01C1/02
CPCC01C1/024C01C1/10C01P2006/80C02F1/02C02F1/20Y02P20/10
Inventor 邓敏李红珊王时川周芳刘宏
Owner CHINA CHENGDA ENG