CN1151063C

CN1151063C - Purification process of CO2 gas material for carbonation process of preparing strontium carbonate

Info

Publication number: CN1151063C
Application number: CNB021029679A
Authority: CN
Inventors: 郭建勋; 李忠跃; 汪志芳; 方春雷
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-02-09
Filing date: 2002-02-09
Publication date: 2004-05-26
Anticipated expiration: 2019-03-19
Also published as: CN1389396A

Abstract

The present invention relates to a method for purifying raw CO2 in the preparation of strontium carbonate by using a carbonizing method, which comprises the steps: after raw CO2 is absorbed by active carbon at normal temperature and normal pressure to remove H2S, an organic sulfur catalyst and iron oxide are utilized to remove organic sulfur, and then a copper catalyst is utilized for deoxidization at 130 to 200 DEG C. Due to the treatment of harmful gases in CO2, the product quality of strontium carbonate can be improved.

Description

CO for preparing strontium carbonate by carbonization method2Method for purifying raw material gas

The present invention is a divisional application entitled "method for producing strontium carbonate by continuous carbonization", filed on 19/3/1999, with application number 99102632.2.

Technical Field

The invention relates to CO for preparing strontium carbonate by a carbonization method₂A gas purification treatment method.

Background

At present, the industrial carbonization method for producing strontium carbonate generally adopts CO such as lime kiln₂Gas source as CO₂Raw material gas due to CO₂The raw material gas contains harmful gases such as sulfur and oxygen, and the total sulfur content is 0.01-0.1g/m³In between, the volume ratio of oxygen is generally between 1.0-0.01%, and untreated sulfur enters the product, thus reducing the product quality. During the carbonization process, due to O₂The presence of (a) entails the following side reactions:

thereby generating sulfite to degrade the quality of the product.

Disclosure of Invention

The invention aims to improve the quality of strontium carbonate products by treating harmful gases in raw material gases, and comprises the following steps.

1. Decarbonizing gas or CO from lime kiln gas or synthetic ammonia₂CO of gas field gas₂Adsorbing and removing H by active carbon at normal temperature and pressure₂S；

2. Removing H from the above₂Gas after SHydrolyzing and removing organic sulfur by using an organic sulfur catalyst and an iron oxide catalyst as catalysts at normal temperature and under the pressure of 0.6 mPa;

3. deoxidizing the gas obtained in the step 2 at the temperature of 130-200 ℃ by using copper as a catalyst.

The invention is through the reaction of CO₂The harmful gas in the raw material gas is treated, so that the treatment caused by the harmful gas can be avoidedThe product quality is reduced due to the existence of harmful gases such as oxygen, sulfur and the like, can stably reach the national high-quality standard, and can also reach the electronic grade standard after adjustment operation.

Drawings

FIG. 1 is a CO of the present invention₂A flow chart of a raw material gas desulfurization and deoxidation process.

Detailed Description

The invention is described in detail below with reference to theattached drawing figures:

as shown in FIG. 1, from lime kiln gas or synthetic ammonia decarbonation gas or CO₂CO of gas field gas₂The raw material gas is sent to a desulfurizing tower 2 by a fan 1, and the active carbon is used for physical adsorption of H₂S, the sulfur is pressurized to 0.6mpa by a compressor 3, cooled to normal temperature by a water cooler 4 and then sent to a second desulfurizing tower 5, and organic sulfur is removed by hydrolysis by taking an organic sulfur catalyst and an iron oxide catalyst as catalysts, and the reaction principle is as follows:

the total sulfur content in the gas is less than or equal to 5ppm, and the desulfurization process is carried out at normal temperature. Then the gas is heated to 130-:

(direct deoxidation)

(catalytic deoxidation)

(reduction regeneration)

In synthetic ammonia decarbonization gas, there is H₂In the presence of the catalyst, the oxidation and reduction regeneration of the Cu catalyst are carried out simultaneously, so that the catalyst can be kept from aging. Such as in CO₂Absence of H in the gas₂When the catalyst activity is reduced, H can be introduced₂The gas makes it reduce and regenerate. O can be reduced by the above-mentioned deoxidation₂The content is reduced to below 10ppm by volume ratio. And (3) sending the deoxidized gas to a heat exchanger 6, cooling to about 80-100 ℃, and then sending to a carbonization working section of the following strontium carbonate.

Claims

1. CO for preparing strontium carbonate by carbonization method₂The raw material gas purification treatment method comprises the following steps:

(1) decarbonizing gas or CO from lime kiln gas or synthetic ammonia₂CO of gas field gas₂Adsorbing and removing H by active carbon at normal temperature and pressure₂S；

(2) Removing H from the above₂Hydrolyzing the gas after S at normal temperature and 0.6mpa pressure by using an organic sulfur catalyst and an iron oxide catalyst as catalysts to remove organic sulfur;

(3) deoxidizing the gas obtained in the step 2 at the temperature of 130-200 ℃ by using copper as a catalyst.

2. The method according to claim 1, characterized in that the CO is₂The raw material gas is synthetic ammonia decarbonization gas or CO₂Gas field gas.