Sulfur Daily Question, March 19------Win 10 Wealth points by answering correctly

1. The initial sulfur recovery process using Claus technology was based on the chemical reaction principle of 2H2S + SO2 = 3S + 2H2O. Since it was not known that H2S could be directly converted into sulfur, the process involved converting all 1/3 of the acidic gas into SO2 in a combustion furnace; thereafter, this SO2 combined with the remaining 2/3 of H2S in a catalyst bed to complete the conversion into sulfur. The problem here is that all the reactions for producing sulfur take place in catalytic reactors; on one hand, these reactors require a large volume, and on the other hand, it is not possible to remove the large amount of heat generated by the reactions. 2. The “improved Claus process” was developed because it was accidentally discovered that sulfur is also produced in the combustion furnace. Thus, the reaction principle of 2H2S+O2=2S+2H2O was discovered. Key advantages of the improvement: 1) 2/3 of the sulfur is generated in the sulfur production furnace, reducing the volume and thermal load of the catalytic reactor. 2) A waste heat boiler was added behind the sulfur production furnace, recovering a large amount of heat.

This post was last edited by Sulfur-Zinc-Aluminum on 2016-3-21 08:33. The principle of the sulfur production process: The Claus process is based on partial oxidation-reduction reactions, with the chemical equations as follows: 2H2S + 3O2 = 2H2O + 2SO2 + Q (1); 2H2S + SO2 = 3/x Sx + 2H2O + Q (2). Equations (1) and (2) can also be written as: 2H2S + O2 = 2/x Sx + 2H2O + Q (3). Based on these reactions, approximately 60–65% of H2S is converted into elemental sulfur in the acid gas combustion furnace. In the acid gas combustion furnace, combustion reactions of ammonia and hydrocarbons also take place simultaneously: 4NH3+3O2→N2+6H2O+Q (4) CH4+2O2→CO2+2H2O+Q (5) H2S+CO2→COS+H2O+Q (6) 2H2S+CO2→CS2+2H2O+Q (7) In the converter, H2S and SO2 undergo further low-temperature Claus reaction under the action of a catalyst, as shown in equation (2), while hydrolysis reactions of organic sulfur also occur. COS+H2O→H2S+CO2-Q (8) CS2+2H2O→2H2S+CO2-Q (9) Through a high-temperature reaction and two catalytic reactions, the conversion rate of H2S can reach over 97%. 1.4.2 Principle of exhaust gas treatment process: The sulfur production exhaust gas, which contains certain amounts of H2S, SO2, and Sx, undergoes hydrogenation reactions under the action of a catalyst: SO2 + 3H2 → H2S + 2H2O (10) Sx + XH2 → XH2S (11). At the same time, very small amounts of reactions according to equations (8) and (9) also occur. The H2S in the hydrogenation exhaust gas is absorbed by MDEA. The purified exhaust gas is burned in an incinerator before being released into the atmosphere. The MDEA that has absorbed H2S is regenerated through desorption, and the resulting acid gas is sent back to the sulfur production unit for further processing.

Briefly describe the process principle of sulfur recovery units? Sulfur-containing crude oil undergoes thermal reactions, catalytic reactions, and hydrogenation reduction reactions in a sulfur recovery unit to recover sulfur.

Briefly describe the process principle of sulfur recovery units? Sulfur-containing crude oil undergoes thermal reactions, catalytic reactions, and hydrogenation reduction reactions in a sulfur recovery unit to recover sulfur.

This post was last edited by Sulfur-Zinc-Aluminum on 2016-3-21 at 08:33. 1. The original Claus sulfur recovery process relied on the chemical reaction principle of 2H2S + SO2 = 3S + 2H2O. Since it was not known that H2S could be directly converted into sulfur, the process involved using 1/3 of the acidic gas to produce SO2 in a combustion furnace; thereafter, this SO2 combined with the remaining 2/3 of H2S in a catalyst bed to complete the conversion into sulfur. The problem here is that all the reactions for producing sulfur take place in catalytic reactors; on one hand, these reactors require a large volume, and on the other hand, it is not possible to remove the large amount of heat generated by the reactions. 2. The “improved Claus process” was developed because it was accidentally discovered that sulfur is also produced in the combustion furnace. Thus, the reaction principle of 2H2S+O2=2S+2H2O was discovered. Key advantages of the improvement: 1) 2/3 of the sulfur is generated in the sulfur production furnace, reducing the volume and thermal load of the catalytic reactor. 2) A waste heat boiler was added behind the sulfur production furnace, recovering a large amount of heat.

This post was last edited by Sulfur-Zinc-Aluminum on 2016-3-21 08:33. Please briefly explain the process principle of sulfur recovery units 1. The initial sulfur recovery process using Claus technology was based on the chemical reaction principle of 2H2S + SO2 = 3S + 2H2O. Since it was not known that H2S could be directly converted into sulfur, the process involved converting all 1/3 of the acidic gas into SO2 in a combustion furnace; thereafter, this SO2 combined with the remaining 2/3 of H2S in a catalyst bed to complete the conversion into sulfur. The problem here is that all the reactions for producing sulfur take place in catalytic reactors; on one hand, these reactors require a large volume, and on the other hand, it is not possible to remove the large amount of heat generated by the reactions. 2. The “improved Claus process” was developed because it was accidentally discovered that sulfur is also produced in the combustion furnace. Thus, the reaction principle of 2H2S+O2=2S+2H2O was discovered. Key advantages of the improvement: 1) 2/3 of the sulfur is generated in the sulfur production furnace, reducing the volume and thermal load of the catalytic reactor. 2) A waste heat boiler was added behind the sulfur production furnace, recovering a large amount of heat.

Isn’t sulfur recovery based on the Scott and Claus processes, with many other processes having been developed on the basis of these two, such as the Ultra-Claus process and so on!