CN105617818A

CN105617818A - Solvent for recovering SO2 from industrial waste gas

Info

Publication number: CN105617818A
Application number: CN201510654996.2A
Authority: CN
Inventors: 林敏�; 武斌
Original assignee: Jiangsu Landian Environmental Protion Co Ltd
Current assignee: Jiangsu Landian Environmental Protion Co Ltd
Priority date: 2015-10-12
Filing date: 2015-10-12
Publication date: 2016-06-01

Abstract

The invention relates to a solvent for recovering SO2 from industrial waste gas. The solvent comprises a main absorbent, an assistant absorbent and an additive, wherein the main absorbent comprises N,N-2-hydroxyethyl piperazine, hexamethylenetetramine and N-hydroxyethyl piperazine; the mass ratio of N,N-2-hydroxyethyl piperazine to hexamethylenetetramine to N-hydroxyethyl piperazine is (2-3):(1-1.5):(1-2); the main absorbent accounts for 70 to 90 percent of the total solvent by mass; the auxiliary absorbent is one or the mixture of phosphoric acid and citric acid; the auxiliary absorbent accounts for 9.5 to 27 percent of the total solvent by mass; the additive comprises polyoxypropylene-polyoxyethylene glycerol ether, imidazoline quaternary ammonium salt and ethylene diamine tetraacetic acid; the additive comprises polyoxypropylene-polyoxyethylene glycerol ether, imidazoline quaternary ammonium salt and ethylene diamine tetraacetic acid, and the mass ratio of polyoxypropylene-polyoxyethylene glycerol ether to imidazoline quaternary ammonium salt to ethylene diamine tetraacetic acid is (1-2):(3-5):(1-2); the additive accounts for 0.5 to 3 percent of the total solvent by mass.

Description

A kind of solvent reclaiming SO2 from industrial waste gas

Technical field

The invention belongs to gas purification technique field, be specifically related to the solvent adopting a kind of solution to reclaim sulfur dioxide from industrial waste gas.

Background technology

SO₂One of predominant gas as atmospheric pollution, has caused the extensive concern of people. In order to effectively suppress to say the serious sulfur dioxide of benefit and the nitrogen oxides pollution to atmospheric environment, countries in the world particularly developed country has carried out long-term and unremitting effort for this, develops more than 200 kind of desulphurization denitration technology. SO₂Control technology can be divided into burning before desulfurization, burning in desulfurization and burning after desulfurization (being also known as flue gas desulfurization). Wherein, flue gas desulfurization (FGD) is current most widely used general, technology that desulfuration efficiency is the highest, and Ye Shi various countries control SO₂The technical way of discharge, within period considerably long from now on, FGD controls SO₂The main method of discharge.

It is said that in general, flue gas desulfurization technique can be divided into two big classes, namely abandon method and absorption method. Prevailing in abandoning method is limestone/gypsum method, the method technical maturity, and desulfuration efficiency is high, is most widely used, but investment cost is high, and can produce certain waste water and solid product. secondary pollution can be caused as dealt with improperly. In absorption method most captivation be active carbon adsorption, its operation is relatively simple, can obtain liquid sulfur dioxide or the product such as sulphuric acid, sulfur, but owing to investment and operating cost are higher, fail to obtain popularization and application widely.

Accordingly, it would be desirable to the sulfur method of developing low-cost, resource. Wherein, the reproducible Wet Flue Gas Desulfurization Technique of solvent passes through regeneration and the recycling of desulfurizing agent, it is possible to generate the SO of high concentration₂, there is good environment and economic benefit.

CN1043269 discloses a kind of method using diamine salts as sulfur dioxide gas absorbent capable of circulation.

CN101274204 discloses a kind of solution using organic cation and inorganic anion method as sulfur dioxide gas absorbent capable of circulation.

CN101721884 discloses a kind of method using piperazine compounds as sulfur dioxide gas absorbent capable of circulation.

CN101537300 discloses ionic liquid that a kind of cation is poly-nitrogen straight chain amine as sulfur dioxide gas absorbent method capable of circulation.

But, all there is the shortcomings such as absorptive capacity is less than normal, regeneration energy consumption is higher, solvent price is high in said method.

Summary of the invention

The invention provides a kind of as sulfur dioxide gas absorbent capable of circulation, absorption efficiency is high, non-secondary pollution.

A kind of solvent reclaiming SO2 from industrial waste gas, including main absorbent, absorbefacient and additive, main absorbent includes N, N-2-hydroxyethyl piperazine, hexamethylenetetramine and N-hydroxyethyl piperazine, the mass ratio of three kinds of materials is (2-3): (1-1.5): (1-2), and it is 70-90% that main absorbent accounts for the mass ratio of total absorbent; Absorbefacient is one or both mixing in phosphoric acid or citric acid, and it is 9.5-27% that absorbefacient accounts for the mass ratio of total absorbent; Additive includes polyoxyethylene polyoxypropylene glycerin ether, imidazoline quaternary ammonium salt and ethylenediaminetetraacetic acid, and the mass ratio of three kinds of materials is (1-2): (3-5): (1-2), and it is 0.5-3% that additive accounts for the mass ratio of total absorbent.

The absorbent of gained is configured to aqueous solution, the SO in air-flow₂It is removed by contacting with the amine salt aqueous solution of the present invention. Make used absorbent regeneration simultaneously, remove all or part of absorbed SO₂, then it is recycled to absorption step.

Detailed description of the invention

Below by way of embodiment, the invention will be further described, its purpose is to be more fully understood that present disclosure, but it is not limiting as protection scope of the present invention.

Embodiment one:

A kind of solvent reclaiming SO2 from industrial waste gas, including main absorbent, absorbefacient and additive, main absorbent includes N, N-2-hydroxyethyl piperazine 42%, hexamethylenetetramine 14% and N-hydroxyethyl piperazine 14%; Absorbefacient includes phosphatase 11 8% and citric acid 9%; Additive includes polyoxyethylene polyoxypropylene glycerin ether 0.375%, imidazoline quaternary ammonium salt 1.875% and ethylenediaminetetraacetic acid 0.75%; Above-mentioned percentage ratio number is mass percent.

Embodiment two:

A kind of solvent reclaiming SO2 from industrial waste gas, including main absorbent, absorbefacient and additive, main absorbent includes N, N-2-hydroxyethyl piperazine 40%, hexamethylenetetramine 30% and N-hydroxyethyl piperazine 20%; Absorbefacient includes phosphatase 79 .5%; Additive includes polyoxyethylene polyoxypropylene glycerin ether 0.1%, imidazoline quaternary ammonium salt 0.3% and ethylenediaminetetraacetic acid 0.1%; Above-mentioned percentage ratio number is mass percent.

Embodiment three:

A kind of solvent reclaiming SO2 from industrial waste gas, including main absorbent, absorbefacient and additive, main absorbent includes N, N-2-hydroxyethyl piperazine 36%, hexamethylenetetramine 12% and N-hydroxyethyl piperazine 24%; Absorbefacient includes citric acid 27%; Additive includes polyoxyethylene polyoxypropylene glycerin ether 0.25%, imidazoline quaternary ammonium salt 0.5% and ethylenediaminetetraacetic acid 0.25%; Above-mentioned percentage ratio number is mass percent.

Absorb the rich solution of acid gas from leading to regenerator top at the bottom of absorption tower, contact with the steam counter-flow risen in regenerator and obtain regeneration. Lean solution after regeneration is sent into absorption tower jacking row after cooling and is absorbed. Enter regeneration gas cooler from regeneration overhead gas out to be reclaimed by the water vapour gas, the separated rear emptying of regeneration gas.

Certain at gas flow, the operating characteristics of different composition absorbent is in Table one.

Table one: the operating characteristics of different composite absorbers

Table one data show to use the absorbent of the present invention, and sulfur dioxide is had higher removal efficiency by it, and energy consumption is relatively low.

Claims

1. the solvent reclaiming SO2 from industrial waste gas, it is characterized in that: include main absorbent, absorbefacient and additive, main absorbent includes N, N-2-hydroxyethyl piperazine, hexamethylenetetramine and N-hydroxyethyl piperazine, the mass ratio of three kinds of materials is (2-3): (1-1.5): (1-2), and it is 70-90% that main absorbent accounts for the mass ratio of total absorbent; Absorbefacient is one or both mixing in phosphoric acid or citric acid, and it is 9.5-27% that absorbefacient accounts for the mass ratio of total absorbent; Additive includes polyoxyethylene polyoxypropylene glycerin ether, imidazoline quaternary ammonium salt and ethylenediaminetetraacetic acid, and the mass ratio of three kinds of materials is (1-2): (3-5): (1-2), and it is 0.5-3% that additive accounts for the mass ratio of total absorbent.